Safety valve pressure measuring device and pre-relief pressure and setting pressure measuring method

Abstract

The invention provides a safety valve pressure measuring device and a front relief pressure and setting pressure measuring method. The safety valve pressure measuring device comprises a base, a first driving assembly and a first force sensor. The base is used for being connected with an external component; the first driving assembly is installed on the base and used for being connected with a valve rod of the safety valve so as to drive the valve rod to move in the axial direction of the valve rod. The first force sensor is connected with the first driving assembly so as to detect the magnitude of the driving force applied to the valve rod by the first driving assembly. The first driving assembly can apply driving force to the valve rod to drive the valve rod to move so as to change the state of the safety valve, and the driving force can be detected through the first force sensor, so that the front relief pressure of the safety valve can be measured under the condition that the pressure of a unit system is not changed; and the accuracy of the measured front pressure relief value of the safety valve can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power safety, and more particularly relates to a safety valve pressure measuring device, a safety valve pre-discharge pressure measuring method and a safety valve setting pressure measuring method. BACKGROUND

[0002] At present, in the detection of safety valve pre-discharge pressure, the method of adjusting system pressure is generally used. During the detection process, the system pressure is continuously increased. Once the safety valve is found to leak, the system pressure value at this time is recorded as the safety valve pre-discharge pressure.

[0003] However, in the field of nuclear power, during the system pressure increasing process of the nuclear power unit, the pressure value changes at a relatively fast rate, and the detection personnel cannot accurately capture the pressure value corresponding to the moment when the safety valve starts to leak in an instant, resulting in a large error in the obtained pre-discharge pressure data. SUMMARY

[0004] The purpose of the embodiment of the application is to provide a safety valve pressure measuring device, a safety valve pressure measuring device and a safety valve setting pressure measuring method, so as to solve the technical problem of large safety valve pre-discharge pressure measuring error in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the application is:

[0006] In a first aspect, a safety valve pressure measuring device is provided, comprising a base, a first driving assembly and a first force sensor; wherein,

[0007] The base is used to connect with an external component;

[0008] The first driving assembly is installed on the base, and the first driving assembly is used to connect with the valve rod of the safety valve to drive the valve rod to move along the axial direction of the valve rod;

[0009] The first force sensor is connected with the first driving assembly to detect the driving force applied by the first driving assembly to the valve rod.

[0010] In some embodiments, the first driving assembly comprises an elastic member and a driving member, the elastic member connects the driving member and the valve rod, the driving member is movably arranged on the base, and the driving member can move relative to the base to compress or stretch the elastic member, so that the elastic member can generate elastic force to drive the valve rod to move;

[0011] The first force sensor is connected with the elastic member to detect the elastic force of the elastic member.

[0012] In some embodiments, the base is provided with a first connecting hole extending along the axial direction of the valve stem;

[0013] The driving member is in the shape of a rod, one end of the driving member is connected with the elastic member, the other end of the driving member is inserted into the first connecting hole and exposed from the first connecting hole, and the driving member is movable in the first connecting hole to compress or stretch the elastic member.

[0014] In some embodiments, the first connecting hole is a threaded hole, the driving member is a screw rod adapted to be screwed into the first connecting hole, and the first driving assembly further comprises a bearing connected with the elastic member, and the screw rod is inserted into the bearing.

[0015] In some embodiments, the end surface of the screw rod is a first convex arc surface, the bearing is provided with a first concave arc surface adapted to the first convex arc surface, and the first convex arc surface abuts against the first concave arc surface; or,

[0016] The end surface of the screw rod is provided with a second concave arc surface, and the bearing is provided with a second convex arc surface adapted to the second concave arc surface, and the second convex arc surface abuts against the second concave arc surface.

[0017] In some embodiments, along the axial direction of the valve stem, the first force sensor is clamped between the elastic member and the driving member.

[0018] In some embodiments, the first driving assembly is sleeved on the valve stem, and the first driving assembly has a first annular surface for abutting against a stepped surface of the outer peripheral wall of the valve stem.

[0019] In some embodiments, the safety valve testing device further comprises a second driving assembly and a second force sensor mounted on the base, the second driving assembly is used to be connected with the valve stem to drive the valve stem to move along the axial direction of the valve stem;

[0020] The second force sensor is connected with the second driving assembly to detect the magnitude of the driving force applied by the second driving assembly to the valve stem;

[0021] The resultant force of the force applied by the first driving assembly to the valve stem and the force applied by the second driving assembly to the valve stem can open the safety valve.

[0022] In some embodiments, the second driving assembly comprises a limiting member and a driving member, the first driving assembly and the driving member are capable of being sequentially sleeved on the outer periphery of the valve rod, the limiting member is arranged on the side of the driving member away from the first driving assembly, and the limiting member is further used for fixedly connecting with the valve rod, so that the first driving assembly and the driving member are clamped between the limiting member and the stepped surface of the outer periphery wall of the valve rod.

[0023] In some embodiments, the limiting member is a sleeve, the sleeve is used for sleeving on the outer periphery of the valve rod and connecting with the valve rod, and the sleeve is abutted with the side surface of the driving member away from the first driving assembly, so as to limit the movement of the driving member away from the first driving assembly.

[0024] In a second aspect, a safety valve pre-discharge pressure measuring method is provided, which is realized based on the safety valve pressure measuring device, and comprises the following steps:

[0025] The system pressure of the unit system is adjusted to the opening of the safety valve of the unit system, the current system pressure is kept unchanged, and the current system pressure F1 is recorded;

[0026] The system pressure is kept at F1, the first driving assembly of the safety valve pressure measuring device is used to apply a first pressure to the valve rod of the safety valve to close the safety valve, the current applied first pressure is kept unchanged, and the current first pressure F2 is recorded;

[0027] According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2.

[0028] In a third aspect, a safety valve pre-discharge pressure measuring method is provided, which is realized based on the safety valve pressure measuring device, and comprises the following steps:

[0029] The system pressure of the unit system is adjusted to the closing of the safety valve of the unit system, the current system pressure is kept unchanged, and the current system pressure F3 is recorded;

[0030] The system pressure is kept at F3, the first driving assembly of the safety valve pressure measuring device is used to apply a first tension to the valve rod of the safety valve to open the safety valve, the current applied first tension is kept unchanged, and the current first tension F4 is recorded;

[0031] According to the system pressure and the first tension, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F3+F4.

[0032] In a fourth aspect, a safety valve setting pressure measuring method is provided, which is realized based on the safety valve pressure measuring device, and includes the following steps:

[0033] Adjust the system pressure of the unit system, and apply a first driving force to the valve stem of the safety valve by using the first driving assembly of the safety valve pressure measuring device until the safety valve is closed, maintain the current system pressure unchanged, and record the current system pressure as F5, wherein the first driving force is a pressure or a pulling force, and the first driving force is used to change the moving resistance of the valve stem;

[0034] Apply a second driving force to the valve stem by using the second driving assembly of the safety valve pressure measuring device until the safety valve is opened, maintain the current first driving force and the current second driving force unchanged, record the current first driving force as F6, and record the current second driving force as F7;

[0035] According to the system pressure, the first driving force and the second driving force, the actual setting pressure Fb of the safety valve is calculated, wherein Fb=F5+F6+F7.

[0036] In some embodiments, when the system pressure is greater than the rated setting pressure of the safety valve, the first driving force is a pressure, and F6<0;

[0037] When the system pressure is less than the rated setting pressure of the safety valve, the first driving force is a pulling force, and F6>0.

[0038] The safety valve pressure measuring device provided in the application has the following beneficial effects: the first driving assembly can apply a driving force to the valve stem to drive the valve stem to move and change the state of the safety valve, and the size of the driving force can be detected by the first force sensor, so that the pre-leakage pressure of the safety valve can be measured without changing the system pressure of the unit system, which helps to improve the accuracy of the measured pre-leakage pressure of the safety valve; it can be understood that it is relatively easy to maintain the system pressure of the unit system within a fixed range, therefore, using the safety valve pressure measuring device provided in the embodiments of the application to measure the pre-leakage pressure of the safety valve can also reduce the difficulty of measuring the pre-leakage pressure of the safety valve; in addition, when the first driving assembly is used to apply a pressure to the valve stem to drive the valve stem to move and switch the safety valve from the open state to the closed state, if the safety valve cannot be closed after the driving force of the first driving assembly is increased to the maximum value within the preset range, it can be determined that the safety valve is in a leakage state, so that the pre-leakage and leakage of the safety valve can be easily identified, thereby facilitating the maintenance of the unit system. BRIEF DESCRIPTION OF DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic diagram showing the connection between a safety valve pressure measuring device and an electronic device provided in an embodiment of this application;

[0041] Figure 2 for Figure 1 The diagram shows a safety valve pressure measuring device.

[0042] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram;

[0043] Figure 4 A schematic diagram showing the connection between a safety valve pressure measuring device and an electronic device provided in another embodiment of this application;

[0044] Figure 5 for Figure 4 The diagram shows a safety valve pressure measuring device.

[0045] Figure 6 for Figure 5 Enlarged diagram of point B in the image;

[0046] Figure 7 A schematic flowchart of a method for measuring the pre-leakage pressure of a safety valve provided in an embodiment of this application;

[0047] Figure 8 A schematic flowchart of a method for measuring the pre-leakage pressure of a safety valve provided in another embodiment of this application;

[0048] Figure 9 This is a schematic flowchart illustrating the safety valve setting pressure measurement method provided in an embodiment of this application.

[0049] The following are the labeling elements in the figure:

[0050] 100. Valve stem; 1001. Stepped surface; 200. Electronic equipment;

[0051] 1. Base; 11. Connecting components; 12. Screws; 13. Mounting plate; 14. Mounting column;

[0052] 2, first driving assembly; 21, driving piece; 211, screw rod; 2111, first convex arc surface; 212, nut; 22, elastic piece; 23, first annular piece; 231, first annular surface; 24, second annular piece; 25, bearing; 251, first concave arc surface;

[0053] 3, first force sensor;

[0054] 4, second driving assembly; 41, driving piece; 42, limiting piece;

[0055] 5, second force sensor. DETAILED DESCRIPTION

[0056] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the following will combine with the accompanying drawings and embodiments to further describe the present application in detail. It should be understood that the specific embodiments described here are only used to explain the present application, and not used to limit the present application. Figures 1 to 9

[0057] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0058] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0059] In addition, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, the meaning of "multiple groups" is two groups or more, the meaning of "multiple pieces" is two pieces or more, and the meaning of "several" is one or more, unless otherwise specifically limited.

[0060] ​The safety valve is an overpressure protection device for a pipeline or a container in a nuclear power unit. During the uplink and downlink of the nuclear power unit, the system pressure of the unit will change. When the system pressure of the unit is too high, the safety valve can be opened to discharge the pressure in the system to avoid damage to the equipment caused by the high pressure. When the system pressure of the unit decreases to the reset pressure of the safety valve, the safety valve can be closed to restore the seal and maintain the normal operation of the system.

[0061] However, in actual operation, when the system pressure of the unit gradually increases to approach but has not yet reached the set pressure of the safety valve, the safety valve often has an unstable seal, resulting in partial steam leakage, i.e., pre-leakage of the safety valve. The pre-leakage of the safety valve not only causes unstable fluctuations in the system pressure, which interferes with the normal operation of the unit, but also causes waste of the medium and increases the operating cost. More seriously, long-term pre-leakage can damage the sealing surface of the safety valve, thereby causing more serious safety accidents, which poses a great threat to the safe operation of the nuclear power unit, and therefore must be strictly controlled and monitored.

[0062] At present, the related art generally uses the method of adjusting the system pressure to detect the pre-leakage pressure of the safety valve. The specific operation process is as follows: the system pressure is continuously increased, and the leakage of the safety valve is closely observed. Once the leakage of the safety valve is found, the system pressure value at this time is recorded as the pre-leakage pressure of the safety valve. However, this traditional detection method has a significant defect. Since the pressure value changes rapidly during the increase of the system pressure of the unit, the detection personnel cannot accurately capture the pressure value corresponding to the moment when the safety valve starts to leak in an instant, resulting in a large error in the obtained pre-leakage pressure data. Such inaccurate data cannot provide a reliable basis for the maintenance of the unit system, is not conducive to timely discovering and solving potential problems of the safety valve, and is difficult to meet the strict requirements of the nuclear power unit for safety and stability.

[0063] Based on this, the embodiments of the present application provide a safety valve pressure measuring device, a safety valve pre-leakage pressure measuring method and a safety valve set pressure measuring method to solve the above problems.

[0064] Reference Figures 1 to 3 The embodiments of the present application first provide a safety valve pressure measuring device, which comprises a base 1, a first driving assembly 2 and a first force sensor 3. The base 1 is used to connect with external components. The first driving assembly 2 is installed on the base 1, and is used to connect with a valve rod 100 of a safety valve to drive the valve rod 100 to move along the axial direction of the valve rod 100. The first force sensor 3 is connected with the first driving assembly 2 to detect the driving force applied by the first driving assembly 2 to the valve rod 100.

[0065] It should be noted that the safety valve pressure measuring device provided by the embodiments of the present application can be used to measure the pre-discharge pressure of the safety valve. During the safety valve pressure measuring process, the valve stem 100 of the safety valve moves relative to the valve body of the safety valve to realize the opening and closing of the safety valve. The external component connected with the base 1 of the safety valve pressure measuring device can be a pipeline of the unit system, or the ground, or a workbench, etc. which is fixed relative to the valve body of the safety valve. The purpose of connecting the base 1 with the external component is to provide support for the first driving assembly 2 and the first force sensor 3. Exemplarily, the base 1 can include a mounting plate 13 and a mounting column 14 connected with the mounting plate 13, wherein the mounting plate 13 can be connected with the first driving assembly 2, and the mounting column 14 can be connected with the external component.

[0066] It should be noted that the safety valve of the embodiments of the present application is a main steam safety valve, and during the use of the nuclear power unit system, the pressure measurement of the main steam safety valve is online measurement, that is, the safety valve does not need to be removed from the unit system, and the pressure of the safety valve installed on the unit system can be directly measured.

[0067] It should be noted that the connection between the two components in the embodiments of the present application can be that the two components are combined into one by adhesive, threaded connection or other means, or the two components can be attached by pressure, and when the pressure disappears, the two components can be separated. Exemplarily, the first driving assembly 2 can be adhered to the valve stem 100 of the safety valve by using adhesive, or the first driving assembly 2 can be extruded with the stepped surface 1001 of the outer periphery of the valve stem 100 by using the pressure generated by the first driving assembly 2, so that the first driving assembly 2 can be attached with the stepped surface 1001 of the outer periphery of the valve stem 100. When the pressure disappears, the first driving assembly 2 and the valve stem 100 can be separated.

[0068] It should be noted that the first driving assembly 2 can provide pressure or tension to the valve stem 100. When the first driving assembly 2 provides pressure to the valve stem 100, the first driving assembly 2 can hinder the opening of the safety valve, and when the first driving assembly 2 provides tension to the valve stem 100, the first driving assembly 2 can promote the opening of the safety valve. The first driving assembly 2 can provide pressure or tension to the valve stem 100 according to the specific state of the safety valve during the pre-discharge pressure measuring process.

[0069] It should be noted that the first driving assembly 2 can change the state of the safety valve during the process of detecting the pre-relief pressure of the safety valve; in some embodiments, the system pressure of the unit system can be maintained at a value that can keep the safety valve in the open state at the beginning of the pressure measurement test, and then the first driving assembly 2 can be used to apply pressure to the valve rod 100 to drive the valve rod 100 to move, so as to make the safety valve close, that is, in this embodiment, the first driving assembly 2 of the safety valve pressure measurement device can make the safety valve switch from the open state to the closed state; in addition, if the safety valve cannot be switched from the open state to the closed state after the driving force of the first driving assembly 2 is increased to the maximum value within the preset range, it can be determined that the safety valve is in a leakage state, and the safety valve can be removed and replaced after the pressure of the unit system drops to a preset value; in other embodiments, the system pressure of the unit system can be maintained at a value that can keep the safety valve in the closed state at the beginning of the pressure measurement test, and then the first driving assembly 2 can be used to apply tension to the valve rod 100 to drive the valve rod 100 to move, so as to make the safety valve open, that is, in this embodiment, the first driving assembly 2 of the safety valve pressure measurement device can make the safety valve switch from the closed state to the open state.

[0070] It should be noted that in some embodiments, the state of the safety valve can be observed to determine whether the safety valve is in the open state or the closed state, and in other embodiments, a displacement sensor can be connected to the valve rod 100 of the safety valve, and the displacement of the valve rod 100 can be measured by the displacement sensor to determine the state of the safety valve.

[0071] It should be noted that the first force sensor 3 is a device that can convert the magnitude of force into a related electrical signal. The first force sensor 3 can detect mechanical quantities such as tension, pressure and strain. The first force sensor 3 is mainly composed of a force-sensitive element, a conversion element and a circuit part, wherein the force-sensitive element is the force carrier of the first force sensor 3, and the force-sensitive element is usually a component with certain elasticity. When an external force is applied to the force-sensitive element, it will produce a corresponding elastic deformation. The conversion element is usually a resistance strain gauge, which is pasted on the surface of the force-sensitive element. When the force-sensitive element is deformed elastically under the action of external force, the resistance strain gauge will also be deformed. The resistance value of the resistance strain gauge will change with its deformation, and this change is proportional to the degree of strain of the force-sensitive element. By measuring the change of the resistance value of the resistance strain gauge, the elastic deformation of the force-sensitive element can be converted into a corresponding change of the electrical signal, thereby realizing the conversion of the force signal to the electrical signal. The circuit part usually connects multiple resistance strain gauges in the form of a Wheatstone bridge. This bridge structure can convert the resistance change of the resistance strain gauge into a change of voltage or current, and can output the corresponding detection value. In some embodiments, the circuit part of the first force sensor 3 can be connected to the electronic device 200, and the detection value of the first force sensor 3 can be displayed through the display screen of the electronic device 200. The error of the first force sensor 3 can be controlled to be not greater than 0.2%, so as to ensure the accuracy of the detection structure.

[0072] It should be noted that after the pressure measurement is completed, the value of the driving force applied by the first driving assembly 2 to the valve stem 100 detected by the first force sensor 3 can be superimposed or subtracted from the system pressure value of the unit system, so as to obtain the value of the pre-relief pressure of the safety valve.

[0073] The safety valve pressure measuring device provided by the embodiment of the present application can apply driving force to the valve stem 100 to drive the valve stem 100 to move to change the state of the safety valve, and can detect the size of the driving force through the first force sensor 3. Thus, the pre-relief pressure of the safety valve can be measured without changing the pressure of the unit system, which helps to improve the accuracy of the measured value of the pre-relief pressure of the safety valve. It can be understood that it is relatively easy to maintain the system pressure of the unit system within a fixed range. Therefore, using the safety valve pressure measuring device provided by the embodiment of the present application to measure the pre-relief pressure of the safety valve can also reduce the difficulty of measuring the pre-relief pressure of the safety valve. In addition, when the first driving assembly 2 is used to apply pressure to the valve stem 100 to drive the valve stem 100 to move to switch the safety valve from the open state to the closed state, if the driving force of the first driving assembly 2 cannot be increased to the maximum value within the preset range to close the safety valve, it can be determined that the safety valve is in a leakage state. Thus, the pre-relief and leakage of the safety valve can be easily identified, thereby facilitating the maintenance of the unit system.

[0074] Referring toFigure 3 In some embodiments, the first driving assembly 2 comprises an elastic member 22 and a driving member 21, the elastic member 22 is connected to the driving member 21 and the valve stem 100, the driving member 21 is movably arranged on the base 1, the driving member 21 is capable of moving relative to the base 1 to compress or stretch the elastic member 22, so that the elastic member 22 is capable of generating elastic force to drive the valve stem 100 to move, and the first force sensor 3 is connected to the elastic member 22 to detect the elastic force of the elastic member 22.

[0075] It should be noted that the elastic force of the elastic member 22 can be the pressure generated by compressing the elastic member 22, or the tension generated by stretching the elastic member 22, that is, the elastic member 22 can provide pressure or tension to the valve stem 100, when the elastic member 22 provides pressure to the valve stem 100, the elastic member 22 can hinder the opening of the safety valve, when the elastic member 22 provides tension to the valve stem 100, the elastic member 22 can promote the opening of the safety valve. The elastic member 22 can provide pressure or tension to the valve stem 100 according to the specific state of the safety valve in the pressure measurement process.

[0076] For example, the elastic member 22 can be a spring, a rubber block, etc.

[0077] It should be noted that the driving member 21 is movably connected to the base 1, that is, the driving member 21 can slide or rotate relative to the base 1, or simultaneously slide and rotate relative to the base 1, so as to adjust the relative position of the driving member 21 and the base 1, and realize the compression or stretching of the elastic member 22 by the driving member 21.

[0078] It should be noted that the driving member 21 can move relative to the base 1 to change the relative position of the driving member 21 and the base 1, so as to change the elastic force direction of the elastic member 22, so that the elastic member 22 can provide pressure or tension to the valve stem 100; in addition, the driving member 21 can adjust the elastic force of the elastic member 22 by adjusting the compression amount or stretching amount of the elastic member 22.

[0079] The driving member 21 of the first driving assembly 2 is movably connected to the base 1, and the relative position of the driving member 21 and the base 1 can be changed when the driving member 21 moves relative to the base 1, so as to flexibly adjust the elastic force and the elastic force direction of the elastic member 22. The elastic member 22 is connected to the valve stem 100, and the driving force is provided to the valve stem 100 by the elastic force of the elastic member 22, and the elastic member 22 can generate corresponding deformation to absorb the displacement of the valve stem 100 during the movement of the valve stem 100, so as to reduce the impact of the movement of the valve stem 100 on the driving member 21, and play a buffering role, which is helpful to improve the service life of the safety valve pressure measurement device.

[0080] Continuing to refer to Figures 1 to 3The base 1 is provided with a first connecting hole extending along the axial direction of the valve rod 100. The driving member 21 is in the shape of a rod. One end of the driving member 21 is connected with the elastic member 22. The other end of the driving member 21 is inserted into the first connecting hole and exposed from the first connecting hole. The driving member 21 can move in the first connecting hole to compress or stretch the elastic member 22.

[0081] It should be noted that the base 1 comprises a connecting member 11 for connecting with external components. The first connecting hole is arranged on the connecting member 11. In some embodiments, the connecting member 11 can be connected with the mounting plate 13 of the base 1 through a screw 12. In other embodiments, the connecting member 11 can be adhered to the mounting plate 13 of the base 1. In still other embodiments, the connecting member 11 can be fixed to the mounting plate 13 of the base 1 through a mortise and tenon structure.

[0082] It should be noted that when the safety valve pressure measuring device is installed on the valve rod 100 of the safety valve, the central axis of the first connecting hole is parallel to the central axis of the valve rod 100. In this way, when the driving member 21 rotates in the first connecting hole, it can move in a direction parallel to the central axis of the valve rod 100, so that the elastic member 22 can generate an elastic force in a direction parallel to the central axis of the valve rod 100, thereby driving the valve rod 100 to move.

[0083] In this embodiment, when the driving member 21 moves in the first connecting hole, the distance between the end of the driving member 21 and the connecting member 11 can be adjusted, so as to compress or stretch the elastic member 22 and facilitate adjustment of the elastic force of the elastic member 22.

[0084] In some embodiments, the first connecting hole is a threaded hole, and the driving member 21 is a screw rod 211 adapted to be screwed into the first connecting hole. The first driving assembly 2 further comprises a bearing 25 connected with the elastic member 22. The screw rod 211 is inserted into the bearing 25.

[0085] In this embodiment, when the screw 211 rotates in the first connecting hole, the distance between the end of the screw 211 and the connecting component 11 can be adjusted, so that the elastic member 22 is compressed or stretched, and the elastic force of the elastic member 22 is adjusted. In addition, when the adjusting external force applied to the screw 211 disappears, the elastic force of the elastic member 22 acting on the screw 211 can make the screw thread of the screw 211 abut against the screw thread in the first connecting hole, so that the driving member 21 is locked with the connecting component 11, and the stability of the elastic force of the elastic member 22 is ensured, thereby facilitating the staff to record the elastic force value of the elastic member 22. The bearing 25 is used to connect the elastic member 22 and the screw 211. When the screw 211 rotates in the first connecting hole, the bearing 25 can absorb the rotational movement of the screw 211, so as to reduce the friction between the screw 211 and the elastic member 22. In addition, the displacement of the screw 211 rotating in the first connecting hole can be transmitted to the bearing 25, so as to adjust the position of the bearing 25, and the bearing 25 can compress or stretch the elastic member 22.

[0086] In some embodiments, the driving member 21 can further include a nut 212 connected with the screw 211. The nut 212 can be arranged at the end of the screw 211 away from the elastic member 22. The staff can use a tool to screw the nut 212 to rotate the screw 211.

[0087] Continuing to refer to Figure 3 In some embodiments, the end surface of the screw 211 is a first convex arc surface 2111, and the bearing 25 is provided with a first concave arc surface 251 matched with the first convex arc surface 2111, and the first convex arc surface 2111 abuts against the inner wall of the first concave arc surface 251.

[0088] The end surface of the screw 211 is arranged as the first convex arc surface 2111, and the bearing 25 is provided with the first concave arc surface 251 matched with the first convex arc surface 2111, and the first convex arc surface 2111 abuts against the inner wall of the first concave arc surface 251. In this way, the contact area between the screw 211 and the bearing 25 can be increased, so as to reduce the pressure between the screw 211 and the bearing 25, and reduce the possibility of deformation of the screw 211 and the bearing 25, thereby helping to improve the service life of the safety valve pressure measuring device.

[0089] In other embodiments, the end surface of the screw 211 can also be provided with a second concave arc surface. At this time, the bearing 25 is provided with a second convex arc surface matched with the second concave arc surface, and the surface of the second convex arc surface abuts against the second concave arc surface.

[0090] The end surface of the screw rod 211 is provided as a second concave arc surface, and the bearing 25 is provided with a second convex arc surface matched with the second concave arc surface, and the surfaces of the second concave arc surface and the second convex arc surface abut against each other, so that the contact area between the screw rod 211 and the bearing 25 can be increased, the pressure between the screw rod 211 and the bearing 25 can be reduced, the possibility of deformation of the screw rod 211 and the bearing 25 can be reduced, and the service life of the pressure measuring device of the safety valve can be improved.

[0091] Referring to Figure 3 , along the axial direction of the valve stem 100, the first force sensor 3 is clamped between the elastic member 22 and the driving member 21.

[0092] By mounting the first force sensor 3 between the elastic member 22 and the driving member 21, the detection error of the first force sensor 3 to the elastic force of the elastic member 22 can be reduced, and the detection accuracy of the pre-discharge pressure of the safety valve can be improved.

[0093] In some embodiments, the first driving assembly 2 is sleeved on the valve stem 100, and the first driving assembly 2 has a first annular surface 231 for connecting with the stepped surface 1001 on the outer periphery of the valve stem 100.

[0094] When the first driving assembly 2 is sleeved on the valve stem 100, that is, the first driving assembly 2 can be sleeved on the outer periphery of the valve stem 100, and the first driving assembly 2 is provided with the first annular surface 231 connected with the stepped surface 1001 on the outer periphery of the valve stem 100, so that the first driving assembly 2 can apply a force to the valve stem 100 along the circumferential direction of the valve stem 100, which can reduce the movement of the valve stem 100 deviating from its own central axis, and improve the accuracy of the measurement results.

[0095] In some embodiments, the driving member 21 is provided with a first mounting hole penetrating the screw rod 211 and the screw nut 212, and the first mounting hole is used for penetrating the valve stem 100, and after the valve stem 100 penetrates the first mounting hole, the driving member 21 can be sleeved on the outer periphery of the valve stem 100.

[0096] In some embodiments, the elastic member 22 is a spring, and the spring is sleeved on the outer periphery of the valve stem 100. In other embodiments, the elastic member 22 can also be a rubber block, and a second mounting hole for penetrating the valve stem 100 can be provided in the center of the rubber block, so that the rubber block can be sleeved on the outer periphery of the valve stem 100. By sleeving the elastic member 22 on the outer periphery of the valve stem 100, the valve stem 100 can also guide the deformation direction of the elastic member 22. For example, when the deformation direction of the elastic member 22 deviates, the side surface of the valve stem 100 can abut against the elastic member 22 to reduce the deviation of the elastic force of the elastic member 22.

[0097] Referring to Figure 3The first driving assembly 2 further comprises a first annular member 23 arranged at one end of the elastic member 22 away from the driving member 21, the first annular member 23 is used to be sleeved on the outer periphery of the valve stem 100, the edge area of the side surface of the first annular member 23 connected to the elastic member 22, and the central area of the side surface of the first annular member 23 away from the elastic member 22 is connected to the stepped surface 1001 of the outer periphery of the valve stem 100.

[0098] The first annular member 23 is arranged at one end of the elastic member 22 away from the driving member 21, the edge area of the side surface of the first annular member 23 connected to the elastic member 22, and the central area of the side surface of the first annular member 23 away from the elastic member 22 is connected to the stepped surface 1001 of the outer periphery of the valve stem 100, the size of the elastic member 22 can not be limited by the size of the stepped surface 1001 of the valve stem 100, and a larger size of the elastic member 22 can be selected to ensure that the elastic member 22 can provide sufficient elastic modulus for the pre-leakage pressure test, and reduce the probability of plastic deformation of the elastic member 22 due to insufficient elastic modulus.

[0099] In some embodiments, the first annular surface 231 is arranged on the first annular member 23, and the first annular surface 231 is a side surface of the first annular member 23 facing the stepped surface 1001 of the outer periphery of the valve stem 100.

[0100] In some embodiments, the first driving assembly 2 further comprises a second annular member 24 arranged between the driving member 21 and the elastic member 22, the second annular member 24 is used to be sleeved on the outer periphery of the valve stem 100, the central area of the side surface of the second annular member 24 connected to the driving member 21, and the edge area of the side surface of the second annular member 24 connected to the elastic member 22.

[0101] The second annular member 24 is arranged between the driving member 21 and the elastic member 22, the central area of the side surface of the second annular member 24 connected to the driving member 21, and the edge area of the side surface of the second annular member 24 connected to the elastic member 22, the size of the elastic member 22 can not be limited by the size of the driving member 21, for example, the orthographic projection of the connection position of the driving member 21 and the second annular member 24 on the surface of the second annular member 24 can not coincide or partially coincide with the orthographic projection of the elastic member 22 on the surface of the second annular member 24. When the driving member 21 comprises a screw rod 211, the orthographic projection of the screw rod 211 on the surface of the second annular member 24 can not coincide or partially coincide with the orthographic projection of the elastic member 22 on the surface of the second annular member 24.

[0102] Referring to Figures 4 to 6The safety valve pressure measuring device of the embodiment of the present application further comprises a second driving assembly 4 and a second force sensor 5 installed on the base 1; the second driving assembly 4 is used to be connected with the valve rod 100 to drive the valve rod 100 to move to drive the valve rod 100 to move along the axial direction of the valve rod, and the second force sensor 5 is connected with the second driving assembly 4 to detect the driving force applied by the second driving assembly 4 to the valve rod 100. Wherein, the resultant force of the force applied by the first driving assembly 2 to the valve rod 100 and the force applied by the second driving assembly 4 to the valve rod 100 can open the safety valve.

[0103] It should be noted that the structure of the second force sensor 5 is similar to that of the first force sensor 3, the first force sensor 3 and the second force sensor 5 can be connected with the electronic device 200, and the detection values of the first force sensor 3 and the second force sensor 5 can be displayed through the display screen of the electronic device 200. The error of the second force sensor 5 can be controlled to be not greater than 0.2%, so as to ensure the accuracy of the detection structure.

[0104] It should be noted that in this embodiment, the safety valve pressure measuring device can be used to measure the actual setting pressure of the safety valve, by comparing the actual setting pressure with the rated setting pressure, it can be determined whether the safety valve meets the requirements of the device operation, so as to determine whether the safety valve needs to be repaired or replaced.

[0105] It can be understood that during the overhaul of the nuclear power unit system, the pressure of part of the pipelines in the unit system will be greater than that during the normal operation of the unit system. For example, the pressure during the normal operation of the unit system is usually 66 bar.g, and during the overhaul of the nuclear power unit system, the pressure of part of the pipelines in the unit system will be increased to 74 bar.g to meet the troubleshooting requirements of the equipment in the unit system. However, this pressure is much higher than the standard value of the setting pressure of the safety valve, that is, it is difficult to test the setting pressure of the safety valve of these pipelines under the pressure during the overhaul of the nuclear power unit system. Usually, the system pressure of the unit system needs to be reduced separately before the safety valve setting pressure test to meet the requirements of the setting pressure test. However, the adjustment of the pressure of the unit system is difficult and usually takes several hours to adjust, which is time-consuming and low in test efficiency.

[0106] The first driving assembly 2 of the safety valve pressure measuring device provided in the embodiments of the present application can provide pressure to the valve rod 100, thereby increasing the resistance of the valve rod 100 to movement, offsetting the difference between the higher pressure during the overhaul of the nuclear power unit system and the pressure during the normal operation of the unit system, so that the actual setting pressure of the safety valve can be detected under the higher pressure during the overhaul of the nuclear power unit system, and the efficiency of the test is improved. Compared with adjusting the system pressure of the unit system, the driving force of the first driving assembly 2 is easier to adjust, and the difficulty of detecting the actual setting pressure of the safety valve is reduced. After the setting pressure measuring test is completed, that is, after the driving force of the second driving assembly 4 is removed, the safety valve can quickly return to the seat under the pressure of the first driving assembly 2, so that the safety valve can quickly switch to the closed state, and the influence on the unit system is reduced.

[0107] In addition, for some pipelines located at the end of the unit system, during the overhaul of the nuclear power unit system, steam is difficult to enter these pipelines, resulting in lower pressure in these pipelines, and it is also difficult to perform the setting pressure measuring test on the safety valve. The first driving assembly 2 of the safety valve pressure measuring device provided in the embodiments of the present application can also provide tension to the valve rod 100, thereby reducing the resistance of the valve rod 100 to movement, offsetting the difference between the lower pressure during the overhaul of the nuclear power unit system and the pressure during the normal operation of the unit system, so that the actual setting pressure of the safety valve can be detected under the lower pressure during the overhaul of the nuclear power unit system, and the efficiency of the test is improved.

[0108] Reference Figure 6 In some embodiments, the second driving assembly 4 further includes a limiting piece 42 and a driving piece 41, the first driving assembly 2 and the driving piece 41 can be used to be sequentially sleeved on the outer periphery of the valve rod 100, the limiting piece 42 is arranged on the side of the driving piece 41 away from the first driving assembly 2, and the limiting piece 42 is further used to be fixed with the valve rod 100, so that the first driving assembly 2 and the driving piece 41 are clamped between the limiting piece 42 and the stepped surface 1001 of the outer peripheral wall of the valve rod 100.

[0109] It should be noted that the driving piece 41 can be a jack, a hydraulic elevator, a pneumatic elevator, an electric hoist or the like, which can lift the valve rod 100. In the embodiments of the present application, the driving piece 41 is a jack.

[0110] The first driving assembly 2 and the driving piece 41 are sequentially sleeved on the outer periphery of the valve rod 100, and the first driving assembly 2 and the driving piece 41 are clamped between the limiting piece 42 and the stepped surface 1001 of the outer peripheral wall of the valve rod 100, so that the first driving assembly 2 and the driving piece 41 can apply a force to the valve rod 100 along the circumference of the valve rod 100, thereby reducing the movement of the valve rod 100 deviating from its own central axis, and improving the accuracy of the measurement.

[0111] In the embodiments of the present application, the limiting member 42 can be a sleeve, which is sleeved on the outer periphery of the valve stem 100 and abuts against the side of the driving member 41 away from the first driving assembly 2 to limit the movement of the driving member 41 away from the first driving assembly 2.

[0112] In some embodiments, the second force sensor 5 can be arranged between the limiting member 42 and the driving member 41 along the axial direction of the valve stem 100.

[0113] The sleeve is sleeved on the outer periphery of the valve stem 100, and the sleeve can limit the driving member 41 along the axial direction of the valve stem 100 to reduce the deviation of the position of the driving member 41.

[0114] In some embodiments, the sleeve is threadedly connected with the valve stem 100, so that the stability of the connection between the sleeve and the valve stem 100 can be improved.

[0115] With reference to Figure 7 The embodiments of the present application also provide a method for measuring the pre-discharge pressure of a safety valve, which comprises the following steps:

[0116] Adjusting the system pressure of the unit system to the opening of the safety valve of the unit system, maintaining the current system pressure unchanged, and recording the current system pressure as F1;

[0117] Maintaining the system pressure at F1, using the first driving assembly 2 of the safety valve pressure measuring device in any of the above embodiments to apply a first pressure to the valve stem 100 of the safety valve to close the safety valve, maintaining the current applied first pressure unchanged, and recording the first pressure as F2;

[0118] According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2.

[0119] It should be noted that some unit systems include pressure detection equipment, and the pressure P1 of the unit system can be obtained according to the pressure detection equipment. Before the pre-discharge pressure measuring test, the effective sealing area S of the safety valve can be obtained, and the system pressure F1 of the unit system can be obtained according to P1*S=F1. In some other embodiments, the pressure P2 generated by the first pressure applied to the valve stem 100 of the safety valve can also be obtained according to F2 / S=P2, and the pre-discharge pressure Pa of the safety valve can be obtained according to Pa=Fa / S=P1-P2.

[0120] It should be noted that in this embodiment, the value of F1 is positive, and the value of F2 is also positive.

[0121] It should be noted that when the unit system pressure gradually rises and just reaches the "opening threshold" of the safety valve, the valve core of the safety valve is opened by the system pressure, and the system pressure at this time is recorded as F1. F1 is the result of the safety valve "passive response to system pressure" - the critical value of the system pressure "pushing open" the safety valve, which reflects the "take-off pressure" of the safety valve. At this time, the safety valve is in the state of "just opening", and the system starts to depressurize. When the system pressure is maintained at F1 (i.e. the safety valve should be in the open state), an external device (the first driving assembly 2) applies a reverse pressure to the valve stem to force the safety valve to close from the open state, and the pressure value corresponding to the external force applied at this time is recorded as F2. F2 is the "active offset system pressure" of the external force - because the system pressure at this time is still F1 (which should open the safety valve), in order to close the safety valve, a force opposite to the system pressure must be applied, and the size of the force reflects the "minimum external force required to close the safety valve". At this time, the safety valve is in the state of "just closing", and the system stops depressurizing. Assuming that only F1 (opening pressure) is measured, it can only be known when the safety valve "opens", but it cannot be determined when it "closes". The combined effect of F1 and F2 simulates the critical state of the safety valve "closing", and the difference (Fa=F1-F2) between the two exactly reflects the pressure difference of the safety valve in the "opening" and "closing" critical states - the smaller the difference, the better the sealing performance of the safety valve after opening, which only needs the system pressure to drop slightly (or apply a smaller external force) to close.

[0122] It can be understood that it is more difficult to maintain the system pressure of the unit system at a fixed value than to capture the instantaneous value of the unit system pressure when the unit system pressure changes. Maintaining the system pressure of the unit system at F1 and applying the first pressure to the valve stem 100 of the safety valve can obtain the pre-leakage pressure of the safety valve by measuring the size of the first pressure, which can reduce the difficulty of measuring the pre-leakage pressure of the safety valve and improve the accuracy of measuring the pre-leakage pressure of the safety valve. In addition, if the first pressure is increased to the maximum value within the preset range and still cannot switch the safety valve from the open state to the closed state, it can be determined that the safety valve is in a leakage state, which can facilitate the identification of the pre-leakage and leakage of the safety valve, thereby facilitating the maintenance of the unit system.

[0123] In some embodiments, the first pressure applied by the first driving assembly 2 to the valve stem 100 before the safety valve is closed can be gradually increased. In this way, the accuracy of obtaining the value of the first pressure when the safety valve is closed can be improved, thereby improving the detection accuracy of the pre-leakage pressure of the safety valve.

[0124] Referring to Figure 8 The safety valve pre-leakage pressure measuring method provided by the embodiments of the present application comprises the following steps:

[0125] Adjusting the system pressure of the unit system to the closing of the safety valve of the unit system, maintaining the current system pressure, recording the current system pressure as F3;

[0126] Maintaining the system pressure at F3, using the first driving assembly 2 of the safety valve pressure measuring device in any of the above embodiments to apply a first pulling force to the valve stem 100 of the safety valve to open the safety valve, maintaining the current first pulling force unchanged, recording the current first pulling force as F4;

[0127] According to the system pressure and the first pulling force, calculating the pre-discharge pressure Fa of the safety valve, wherein Fa=F3+F4.

[0128] It should be noted that some unit systems contain pressure detection equipment, and the pressure P3 of the unit system can be obtained according to the pressure detection equipment. Before the pre-discharge pressure measuring test, the effective sealing area S of the safety valve can be obtained, and the system pressure F3 of the unit system can be obtained according to P3*S=F3. In some embodiments, the equivalent pressure P4 generated by the first pulling force applied to the valve stem 100 of the safety valve can also be obtained according to F4 / S=P4, and the pre-discharge pressure Pa of the safety valve can be obtained according to Pa=Fa / S=P4-P4.

[0129] It should be noted that in this embodiment, the value of F3 is positive, and the value of F4 is also positive.

[0130] It can be understood that it is more difficult to maintain the system pressure of the unit system at a fixed value than to capture the instantaneous value of the unit system pressure when the unit system pressure changes. By maintaining the system pressure of the unit system at F3 and applying a first pulling force to the valve stem 100 of the safety valve, the pre-discharge pressure of the safety valve can be obtained by measuring the size of the first pulling force, which can reduce the difficulty of measuring the pre-discharge pressure of the safety valve and improve the accuracy of measuring the pre-discharge pressure of the safety valve.

[0131] In some embodiments, the first pulling force applied by the first driving assembly 2 to the valve stem 100 before the safety valve is opened can gradually increase. In this way, the accuracy of obtaining the value of the first pulling force when the safety valve is opened can be improved, thereby improving the detection accuracy of the pre-discharge pressure of the safety valve.

[0132] Referring to Figure 9 The embodiments of the present application also provide a safety valve setting pressure measuring method, comprising the following steps:

[0133] Adjusting the system pressure of the unit system, and at the same time, using the first driving assembly 2 of the safety valve pressure measuring device in any of the above embodiments to apply a first driving force to the valve stem 100 of the safety valve to close the safety valve, maintaining the current system pressure unchanged, recording the current system pressure as F5, wherein the first driving force is a pressure or a pulling force, and the first driving force is used to change the moving resistance of the valve stem 100.

[0134] The second driving assembly 4 of the safety valve pressure measuring device in any of the above embodiments applies a second driving force to the valve stem 100 to pull the safety valve open, the current first driving force and the second driving force remain unchanged, the current first driving force is recorded as F6, and the current second driving force is recorded as F7.

[0135] According to the system pressure, the first driving force and the second driving force, the actual set pressure Fb of the safety valve is calculated, wherein Fb=F5+F6+F7.

[0136] It should be noted that some unit systems contain pressure detection equipment, and the pressure P5 of the unit system can be obtained according to the pressure detection equipment. Before the set pressure measuring test, the effective sealing area S of the safety valve can be obtained, and the system pressure F6 of the unit system can be obtained according to P5*S=F5. In some embodiments, the equivalent pressure P6 generated by the first driving force applied to the valve stem 100 of the safety valve can be obtained according to F6 / S=P6, the equivalent pressure P7 generated by the second driving force applied to the safety valve can be obtained according to F7 / S=P7, and the actual set pressure Pb of the safety valve can be obtained according to Pb=Fb / S=P6+P5+P7.

[0137] It should be noted that the size of the first driving force can remain unchanged or change during the set pressure measuring test. When the size of the first driving force changes, the value of the safety valve at the opening moment can be recorded as F6.

[0138] It should be noted that the second driving force applied by the second driving assembly 4 to the valve stem 100 can gradually increase before the safety valve is opened. In this way, the accuracy of obtaining the value of the second driving force when the safety valve is opened can be improved, thereby improving the detection accuracy of the actual set pressure of the safety valve.

[0139] It should be noted that the first driving force is used to change the moving resistance of the valve stem 100. In this embodiment, the valve stem 100 does not move when the second driving force is not applied to the valve stem 100.

[0140] It should be noted that when the first driving force is a pressure, the first driving force and the second driving force are opposite, and the effects of the first driving force, the second driving force and the system pressure on the valve stem 100 are opposite. At this time, the value F6 of the first driving force can be recorded as a negative value, that is, F6<0. When the first driving force is a pulling force, the first driving force and the second driving force are in the same direction, and the effects of the first driving force, the second driving force and the system pressure on the valve stem 100 are the same. At this time, the value F6 of the first driving force can be recorded as a positive value, that is, F6>0.

[0141] The first driving force provided to the valve stem 100 can change the resistance of the valve stem 100 to move, so as to offset the difference between the pressure in the nuclear power unit system during the overhaul and the pressure during the normal operation of the unit system, so that the actual setting pressure of the safety valve can be detected under the higher / lower pressure during the overhaul of the nuclear power unit system, which helps to improve the efficiency of the test; compared with adjusting the system pressure of the unit system, the first driving force is easier to adjust, and the detection difficulty of the safety valve setting pressure can be reduced.

[0142] In some embodiments, when the system pressure is greater than the rated setting pressure of the safety valve, the first driving force is a pressure, F6 < 0.

[0143] At this time, the safety valve setting pressure measuring method comprises the following steps:

[0144] Adjusting the system pressure of the unit system, and at the same time, using the first driving assembly 2 in any of the above embodiments to apply a first driving force to the valve stem 100 of the safety valve, the first driving force being a pressure, until the safety valve is closed, the current system pressure is kept unchanged, and the current system pressure is recorded as F5.

[0145] Using the second driving assembly 1 in any of the above embodiments to apply a second driving force to the valve stem 100 until the safety valve is opened, the current first driving force and the current second driving force are kept unchanged, the current first driving force is recorded as F6, and the current second driving force is recorded as F7.

[0146] According to the system pressure, the first driving force and the second driving force, the actual setting pressure Fb of the safety valve is calculated, wherein Fb = F5 + F6 + F7.

[0147] When the first driving force is a pressure, the pressure provided to the valve stem 100 can increase the resistance of the valve stem 100 to move, and can offset the difference between the higher pressure during the overhaul of the nuclear power unit system and the pressure during the normal operation of the unit system, so that the actual setting pressure of the safety valve can be detected under the higher pressure during the overhaul of the nuclear power unit system, which helps to improve the efficiency of the test; compared with adjusting the system pressure of the unit system, the first driving force is easier to adjust, and the detection difficulty of the safety valve setting pressure can be reduced.

[0148] In addition, after the setting pressure measuring test is completed, that is, after the second driving force is removed, the safety valve can quickly reset under the action of the first driving force, so that the safety valve can quickly switch to the closed state, so as to reduce the probability that the system pressure is close to the reset pressure of the safety valve and the safety valve cannot reset, thereby reducing the influence on the unit system.

[0149] In some embodiments, when the system pressure is less than the rated setting pressure of the safety valve, the first driving force is a pulling force, F6 > 0.

[0150] At this time, the safety valve set pressure measuring method comprises the following steps:

[0151] Adjust the system pressure of the unit system, and apply a first driving force to the valve rod 100 of the safety valve by using the first driving assembly 2 in any of the above embodiments, the first driving force being a pulling force, until the safety valve is closed, the current system pressure is kept unchanged, and the current system pressure is recorded as F5;

[0152] Apply a second driving force to the valve rod by using the second driving assembly 1 in any of the above embodiments until the safety valve is opened, the current first driving force and the current second driving force are kept unchanged, the current first driving force is recorded as F6, and the current second driving force is recorded as F7;

[0153] According to the system pressure, the first driving force and the second driving force, the actual set pressure Fb of the safety valve is calculated, wherein Fb=F5+F6+F7.

[0154] When the first driving force is a pulling force, the pulling force provided to the valve rod 100 can reduce the resistance of the movement of the valve rod 100, and can offset the difference between the lower pressure during the overhaul of the nuclear unit system and the pressure during the normal operation of the unit system, so that the actual set pressure of the safety valve can be detected under the lower pressure during the overhaul of the nuclear unit system, and the efficiency of the test is improved.

[0155] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure measuring device for a safety valve, characterized in that The safety valve testing device comprises a base, a first driving assembly and a first force sensor. The base is used for connecting with an external component. The first driving assembly is mounted on the base and is used for connecting with a valve rod of a safety valve to drive the valve rod to move along an axial direction of the valve rod. The first force sensor is connected with the first driving assembly to detect a driving force applied by the first driving assembly to the valve rod.

2. The pressure measuring device for a safety valve according to claim 1, wherein The first driving assembly comprises an elastic member and a driving member, the elastic member connects the driving member and the valve rod, the driving member is movably arranged on the base, and the driving member is capable of moving relative to the base to compress or stretch the elastic member, so that the elastic member can generate an elastic force to drive the valve rod to move. The first force sensor is connected with the elastic member to detect the elastic force of the elastic member.

3. The pressure measuring device for a safety valve according to claim 2, wherein The base is provided with a first connecting hole, and the first connecting hole extends along the axial direction of the valve rod. The driving member is in the form of a rod, one end of the driving member is connected with the elastic member, the other end of the driving member penetrates into the first connecting hole and is exposed from the first connecting hole, and the driving member is capable of moving in the first connecting hole to compress or stretch the elastic member.

4. The pressure measuring device for a safety valve according to claim 3, wherein The first connecting hole is a threaded hole, the driving member is a screw rod which is screwed into the first connecting hole, the first driving assembly further comprises a bearing, the bearing is connected with the elastic member, and the screw rod is inserted into the bearing.

5. The pressure measuring device for a safety valve according to claim 4, wherein An end surface of the screw rod is a first convex arc surface, the bearing is provided with a first concave arc surface which is matched with the first convex arc surface, and the first convex arc surface abuts against the first concave arc surface; or An end surface of the screw rod is provided with a second concave arc surface, the bearing is provided with a second convex arc surface which is matched with the second concave arc surface, and the second convex arc surface abuts against the second concave arc surface.

6. The pressure measuring device for a safety valve according to claim 2, wherein Along the axial direction of the valve rod, the first force sensor is clamped between the elastic member and the driving member.

7. A pressure measuring device for a safety valve according to any one of claims 1 to 6, wherein The first driving assembly is sleeved on the valve rod, and the first driving assembly has a first annular surface which is used for abutting against a stepped surface of an outer peripheral wall of the valve rod.

8. A pressure measuring device for a safety valve according to any one of claims 1-6, characterized in that The safety valve testing device further comprises a second driving assembly and a second force sensor which are mounted on the base, the second driving assembly is used for connecting with the valve rod to drive the valve rod to move along the axial direction of the valve rod, The second force sensor is connected with the second driving assembly to detect a driving force applied by the second driving assembly to the valve rod. The resultant force of the force applied by the first driving assembly to the valve rod and the force applied by the second driving assembly to the valve rod can make the safety valve open.

9. The relief valve pressure measuring device of claim 8, wherein, The second driving assembly comprises a limiting member and a driving member, the first driving assembly and the driving member can be used for being sleeved on the outer periphery of the valve rod in sequence, the limiting member is arranged on a side of the driving member which is away from the first driving assembly, and the limiting member is further used for being fixedly connected with the valve rod, so that the first driving assembly and the driving member are clamped between the limiting member and the stepped surface of the outer peripheral wall of the valve rod.

10. The pressure measuring device for a safety valve according to claim 9, wherein The limiting piece is a sleeve, which is used to be sleeved on the outer periphery of the valve rod and connected with the valve rod, and the sleeve is abutted with the side of the driving piece away from the first driving assembly to limit the movement of the driving piece away from the first driving assembly.

11. A method of determining a pre-relief pressure of a safety valve, characterized by, The safety valve pre-discharge pressure measuring method comprises the following steps based on the safety valve pressure measuring device of any one of claims 1 to 7: Adjust the system pressure of the unit system to the opening of the safety valve of the unit system, maintain the current system pressure unchanged, and record the current system pressure as F1; Maintain the system pressure at F1, apply a first pressure to the valve rod of the safety valve using the first driving assembly of the safety valve pressure measuring device until the safety valve is closed, maintain the current first pressure unchanged, and record the current first pressure as F2; According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2.

12. A method of determining a pre-relief pressure of a safety valve, characterized by, The safety valve pre-discharge pressure measuring method comprises the following steps based on the safety valve pressure measuring device of any one of claims 1 to 7: Adjust the system pressure of the unit system to the opening of the safety valve of the unit system, maintain the current system pressure unchanged, and record the current system pressure as F1; Maintain the system pressure at F1, apply a first pressure to the valve rod of the safety valve using the first driving assembly of the safety valve pressure measuring device until the safety valve is closed, maintain the current first pressure unchanged, and record the current first pressure as F2; According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2.

13. A method of determining the set pressure of a safety valve, characterized in that The safety valve pre-discharge pressure measuring method comprises the following steps based on the safety valve pressure measuring device of any one of claims 1 to 7: Adjust the system pressure of the unit system to the opening of the safety valve of the unit system, maintain the current system pressure unchanged, and record the current system pressure as F1; Maintain the system pressure at F1, apply a first pressure to the valve rod of the safety valve using the first driving assembly of the safety valve pressure measuring device until the safety valve is closed, maintain the current first pressure unchanged, and record the current first pressure as F2; According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2.

14. The method of setting pressure test of a safety valve according to claim 13, characterized in that, The safety valve pre-discharge pressure measuring method comprises the following steps based on the safety valve pressure measuring device of any one of claims 1 to 7: Adjust the system pressure of the unit system to the opening of the safety valve of the unit system, maintain the current system pressure unchanged, and record the current system pressure as F1; Maintain the system pressure at F1, apply a first pressure to the valve rod of the safety valve using the first driving assembly of the safety valve pressure measuring device until the safety valve is closed, maintain the current first pressure unchanged, and record the current first pressure as F2; According to the system pressure and the first pressure, the pre-discharge pressure Fa of the safety valve is calculated, wherein Fa=F1-F2. When the system pressure is greater than the rated set pressure of the safety valve, the first driving force is pressure, and F6<0; When the system pressure is less than the rated set pressure of the safety valve, the first driving force is tension, and F6>0.

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