A sealing detection device and method for a boiler pressure vessel

Abstract

The present application relates to the technical field of mechanical sensor, particularly relates to a sealing detection device and method of boiler pressure vessel, the sealing detection device of boiler pressure vessel includes instrument main body, first isolation diaphragm and second isolation diaphragm, the lower end of instrument main body is provided with installation ring groove, first isolation diaphragm is arranged in installation ring groove, and installation ring groove is isolated into filling liquid tank and medium liquid tank medium liquid tank, second isolation diaphragm has multiple, multiple second isolation diaphragm is sequentially arranged below first isolation diaphragm along vertical direction, and multiple second isolation diaphragm can be moved along vertical direction.The first isolation diaphragm and the second isolation diaphragm are arranged, the number of the second isolation diaphragm of stacked configuration is adjusted, the number of the second isolation diaphragm actually participating in force transmission is dynamically adjusted, so as to change the thickness of the " diaphragm " formed by the second isolation diaphragm and the first isolation diaphragm, to adapt to the precision requirement under different sealing detection working conditions.

Description

Technical Field

[0001] This invention relates to the field of mechanical sensor technology, and in particular to a sealing detection device and method for boiler pressure vessels. Background Technology

[0002] A boiler pressure vessel is a sealed pressure-bearing device that withstands a certain pressure load and is used to produce or transport steam, hot water, and high-pressure gases. Because boiler pressure vessels pose safety risks such as explosions and leaks during use, sealing tests are necessary. Mechanical sensors play a crucial role in detecting the sealing performance of boiler pressure vessels, especially during the pressure testing phase.

[0003] Currently, diaphragm pressure transmitters are widely used mechanical sensors for testing the sealing performance of boiler pressure vessels. During operation, the pressure of the measured medium acts directly on the transmitter's diaphragm. Since the diaphragm is an elastic element, it undergoes elastic deformation proportional to the pressure. Because the sealed cavity between the diaphragm and the transmitter's internal sensing core (sensing diaphragm) is filled with an inert filling fluid, the deformation of the diaphragm forms a hydraulic column through the filling fluid, transmitting the pressure to the sensing diaphragm without loss. Since the sensing diaphragm and the fixed electrode form a capacitor, when the pressure of the filling fluid causes the sensing diaphragm to deform, the distance between the sensing diaphragm and the fixed electrode changes, resulting in a change in capacitance. The transmitter detects this change in capacitance, converts it into a corresponding pressure value, and outputs a millivolt-level voltage signal. Based on this voltage signal, the sealing pressure inside the boiler can be calculated and displayed on the transmitter's electronic display screen.

[0004] The accuracy requirements for sealing tests on boilers and pressure vessels vary at different stages. For example, in routine sealing tests (such as airtightness / hydraulic pressure testing), the goal is to detect minor leaks, so only medium to low accuracy is needed. In strength tests and macroscopic inspections, medium to high accuracy is required to verify structural integrity. And in precision and micro-leakage detection stages, extremely high accuracy is required to locate and quantify micro-leakage. To accommodate multi-stage sealing tests, the diaphragm pressure transmitters currently used in boilers and pressure vessels are mostly of medium to high accuracy. This inevitably results in poor accuracy of the detection devices in precision and micro-leakage testing stages, as well as poor overpressure capacity and stability in routine sealing tests. Summary of the Invention

[0005] Therefore, it is necessary to provide a sealing test device and method for boiler pressure vessels to address the problems existing in current sealing test devices, in order to solve the problem of poor performance of existing medium and high precision sealing test devices in the conventional sealing test stage and the precision and micro-leakage stage.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A sealing detection device for a boiler pressure vessel includes:

[0008] The instrument body has a mounting ring groove at the lower end;

[0009] The first isolation diaphragm is disposed in the mounting ring groove, and the mounting ring groove is separated into a filling liquid tank and a medium liquid tank.

[0010] There are multiple second isolation diaphragms, which are arranged vertically below the first isolation diaphragm, and all of the multiple second isolation diaphragms can move vertically.

[0011] The second isolation diaphragm has multiple vent holes evenly spaced around its surface, and the vent holes on adjacent second isolation diaphragms are staggered.

[0012] Preferably, each of the multiple second isolation diaphragms has a rigid support ring at its upper end. An adjusting screw is connected to the upper end of the rigid support ring. The adjusting screw is threaded and sealed to the instrument body. The adjusting screw and the rigid support ring can move synchronously along the axis of the rigid support ring and rotate relative to each other around the axis of the rigid support ring.

[0013] Preferably, two adjacent rigid support rings in the horizontal direction are slidably connected.

[0014] Preferably, a first elastic element is provided between each of the two adjacent second isolation diaphragms, and the first elastic element is used to prevent the two adjacent second isolation diaphragms from getting close to each other in the vertical direction.

[0015] Preferably, a first isolation ring and a second isolation ring are provided radially from the outside to the inside within the mounting ring groove and above the first isolation diaphragm. The second isolation ring is used to divide the filling liquid tank into an inner tank and an outer tank. A separator ring is provided between the first isolation ring and the second isolation ring to divide the outer tank into a lower tank and an upper tank. An adjustment ring is slidably connected inside the upper tank. The adjustment ring and the separator ring are spaced apart vertically to form a compensation chamber. The compensation chamber is connected to the inner tank, and both the compensation chamber and the inner tank are filled with filling liquid.

[0016] The adjusting ring can move vertically, thereby changing the volume of the compensation chamber, and the volume of the compensation chamber is positively correlated with the temperature of the filling liquid.

[0017] Preferably, the lower end of the adjusting ring is provided with a connecting rod, which passes through the dividing ring downward and is slidably connected to the dividing ring. The lower end of the connecting rod is provided with a sensing ring, which is slidably connected to the wall of the lower trough.

[0018] Preferably, a second elastic element is provided between the adjusting ring and the top wall of the mounting ring groove, the second elastic element preventing the adjusting ring from approaching the top wall of the mounting ring groove.

[0019] Preferably, the filling liquid is silicone oil.

[0020] Preferably, both the first and second isolation diaphragms are corrugated diaphragms.

[0021] A method for testing the seal of a boiler pressure vessel, using the aforementioned boiler pressure vessel seal testing device, includes the following steps:

[0022] S100, determine the sealing test conditions, that is, determine whether the required testing accuracy for the sealing test conditions is extremely high, medium-high, or medium-low.

[0023] S200, rotate the adjusting screw to adjust the number of the second isolation diaphragms in the stacked configuration.

[0024] The beneficial effects of this invention are:

[0025] 1. The present invention provides a first isolation diaphragm and a second isolation diaphragm. By adjusting the number of stacked second isolation diaphragms, the number of second isolation diaphragms actually involved in force transmission can be dynamically adjusted, thereby changing the thickness of the "diaphragm" formed by the cooperation of the second isolation diaphragm and the first isolation diaphragm to adapt to the accuracy requirements under different sealing and testing conditions.

[0026] 2. The present invention features an adjustable compensation chamber, which dynamically adjusts its volume according to changes in medium temperature to reduce the impact of thermal expansion of the filling fluid on the accuracy of seal detection, thereby reducing errors and improving the accuracy of seal detection. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of a sealing detection device for a boiler pressure vessel according to the present invention.

[0028] Figure 2 for Figure 1 The front view;

[0029] Figure 3 for Figure 2 Sectional view of AA;

[0030] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0031] Figure 5 for Figure 3 A magnified schematic diagram of the structure at point C;

[0032] Figure 6 This is an exploded view of a sealing detection device for a boiler pressure vessel according to the present invention.

[0033] Figure 7 for Figure 6 A magnified schematic diagram of the structure at point D;

[0034] Figure 8 This is a schematic diagram of the internal structure of the instrument body in the sealing detection device for a boiler pressure vessel according to the present invention.

[0035] in:

[0036] 100. Instrument body; 101. Head; 102. Connecting part; 110. Mounting ring groove; 111. Filling liquid tank; 1111. Inner tank; 1112. Outer tank; 11121. Lower tank; 11122. Upper tank; 11123. Compensation chamber; 112. Medium liquid tank; 113. Capacitor tank; 114. Connecting micropore; 115. Constant pressure orifice;

[0037] 200. First isolation diaphragm;

[0038] 300. Second isolation diaphragm; 310. Vent hole; 320. Rigid support ring; 330. Flange platform; 340. Adjusting screw; 350. Sealing ring; 360. First elastic element;

[0039] 410. First isolation ring; 411. Vertical guide groove; 420. Second isolation ring; 430. Separating ring; 440. Adjusting ring;

[0040] 510. Connecting rod; 520. Sensing ring; 530. Second elastic element. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] The essence of boiler and pressure vessel sealing testing is to detect the pressure difference between the internal pressure and the external environment, as well as pressure fluctuations within the vessel. Mechanical sensors, which convert these minute pressure changes into measurable electrical signals, enable personnel to promptly detect even minor sealing defects. Therefore, mechanical sensors are widely used in boiler and pressure vessel sealing testing. Since boiler sealing testing (especially water / gas pressure testing) requires mechanical sensors to operate stably in high-temperature, high-pressure, and highly corrosive environments, diaphragm pressure transmitters, as a type of mechanical sensor, are particularly suitable for boiler and pressure vessel sealing testing. The diaphragm (such as a metal diaphragm) of a diaphragm pressure transmitter has good elasticity and impact resistance, and can withstand overloads several times its rated pressure, making it extremely suitable for operation in high-pressure environments. Furthermore, the diaphragm design of diaphragm pressure transmitters reduces media corrosion to the sensor, extends its service life, and lowers maintenance costs, thus leading to its widespread application.

[0045] However, to accommodate multi-stage sealing tests, most diaphragm pressure transmitters currently used in boilers and pressure vessels are of medium to high precision. This inevitably leads to poor accuracy in precision and micro-leakage testing stages, as well as poor overpressure capacity and stability in routine sealing tests. To address this issue, this invention provides a sealing testing device for boilers and pressure vessels, such as... Figures 1 to 8As shown, the instrument includes a main body 100, a first isolation diaphragm 200, and a second isolation diaphragm 300. A mounting ring groove 110 is provided at the lower end of the main body 100. The first isolation diaphragm 200 is disposed within the mounting ring groove 110, which vertically divides the mounting ring groove 110 into a filling liquid tank 111 and a medium liquid tank 112. The filling liquid tank 111 is filled with filling liquid. After the main body 100 is installed at a designated position on a boiler container, the fluid medium inside the boiler container can enter and fill the medium liquid tank 112. Multiple second isolation diaphragms 300 are provided, arranged vertically below the first isolation diaphragm 200, and all of the second isolation diaphragms 300 can move vertically. Multiple vent holes 310 are provided at equal intervals along the circumference of the surface of each second isolation diaphragm 300, with the vent holes 310 on adjacent second isolation diaphragms 300 being staggered.

[0046] During installation, the staff installs the instrument body 100 at the designated position on the boiler vessel. In the routine sealing test phase, since only medium to low precision is required, multiple second isolation diaphragms 300 are moved vertically upwards until the uppermost second isolation diaphragm 300 is attached to the surface of the first isolation diaphragm 200. In two adjacent second isolation diaphragms 300, the lower second isolation diaphragm 300 is attached to the lower surface of the upper second isolation diaphragm 300. At this time, multiple second isolation diaphragms 300 are stacked together vertically and attached to the lower surface of the first isolation diaphragm 200. Since the vent holes 310 on adjacent second isolation diaphragms 300 are staggered, a thicker "diaphragm" is formed, which is more rigid and less prone to deformation under slight pressure changes. Therefore, the "diaphragm" formed by the first isolation diaphragm 200 and multiple second isolation diaphragms 300 has better overpressure capability and stronger stability to meet the requirements of medium to low precision sealing testing.

[0047] During the strength test and macroscopic inspection stages, since a medium-to-high precision "diaphragm" is required, the number of stacked second isolation diaphragms 300 can be appropriately reduced according to actual needs. This results in the unstacked second isolation diaphragms 300 being spaced apart from each other. Because the vent holes 310 on adjacent second isolation diaphragms 300 are staggered, the medium liquid can pass through each unstacked second isolation diaphragm 300 sequentially from bottom to top until it acts on the lowest second isolation diaphragm 300 among the stacked second isolation diaphragms 300. Therefore, this is equivalent to reducing the thickness of the "diaphragm". As a result, the rigidity of the "diaphragm" is reduced and its deformation capacity is enhanced to meet the requirements of medium-to-high precision sealing tests.

[0048] In the precision and minute leak detection stage, due to the need for extremely high precision, all the second isolation diaphragms 300 are moved from bottom to top until adjacent second isolation diaphragms 300 are spaced apart. At this time, the medium liquid passes through the vent holes 310 on each second isolation diaphragm 300 from bottom to top and acts directly on the first isolation diaphragm 200. Since the first isolation diaphragm 200 is very thin, it can deform when there is a slight pressure change in the medium liquid. Therefore, the sensitivity of the seal detection device is the highest at this time to meet the requirements of extremely high precision seal detection.

[0049] It should be added that, as Figure 4 and Figure 6 As shown, in order to achieve independent adjustment of each layer of the second isolation diaphragm 300 and ensure that the individual second isolation diaphragms 300 do not interfere with each other, the outer diameters of the multiple second isolation diaphragms 300 and their corresponding rigid support rings 320 change sequentially in a stepped manner along the vertical direction. Correspondingly, multiple sets of adjusting screws 340 are radially staggered on the lower end face of the instrument body 100, that is, the adjusting screws 340 corresponding to the rigid support rings 320 of different levels are located in the circumferential direction of concentric circles of different diameters with the center of the instrument body 100 as the center. In this way, the adjusting screws 340 can be directly connected to the rigid support rings 320 of the corresponding level without being blocked by other rigid support rings 320 above them.

[0050] It should also be noted that, under the requirements of medium-to-high precision sealing testing and ultra-high precision sealing testing, multiple second isolation diaphragms 300 will be in a state where adjacent second isolation diaphragms 300 are spaced apart. Because the vent holes 310 on adjacent second isolation diaphragms 300 are staggered, the spaced second isolation diaphragms 300 dampen the flow of the medium liquid, reducing the pressure value on the "diaphragm" to reduce the impact force from the medium liquid on the "diaphragm", thus increasing the service life of the first isolation diaphragm 200 and the second isolation diaphragm 300. Furthermore, the thinner the "diaphragm", the more significant the damping effect of the "damper" formed by the spaced second isolation diaphragms 300 is; conversely, the thicker the "diaphragm", the weaker the damping effect of the "damper" formed by the spaced second isolation diaphragms 300 is. Therefore, the strength of the damping effect can be adaptively adjusted according to the sealing testing requirements, resulting in a compact and ingenious structure.

[0051] Furthermore, the instrument body 100 includes a head 101 and a connecting part 102. A mounting ring groove 110 is formed on the connecting part 102, and the wall of the mounting ring groove 110 is threaded for installation at a designated position on the boiler container. The head 101 is threadedly connected to the connecting part 102. A capacitor groove 113 is formed inside the head 101. The capacitor groove 113 is connected to the mounting ring groove 110 through a communicating microhole 114 formed on the connecting part 102. A sensing diaphragm is provided at the bottom of the capacitor groove 113. Fixed electrodes and other electronic components are provided inside the capacitor groove 113 and above the sensing diaphragm. An electronic display screen is provided outside the head 101. The electronic display screen is connected to the electronic components inside the capacitor groove 113 for receiving the calculated internal pressure of the boiler container. When the pressure of the filling liquid causes the sensing diaphragm to deform, the distance between the sensing diaphragm and the fixed electrode changes, resulting in a change in capacitance. The electronic components in the capacitor tank 113 detect the change in capacitance, convert it into the corresponding pressure value, and output a millivolt-level voltage signal. The sealing pressure inside the boiler can then be calculated based on the voltage signal and sent to the electronic display screen, which is then displayed on the electronic display screen of the head 101.

[0052] In a further embodiment, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, a rigid support ring 320 is provided at the upper end of each of the multiple second isolation diaphragms 300. An adjusting screw 340 is connected to the upper end of the rigid support ring 320. The adjusting screw 340 is threaded and sealed to the instrument body 100. The adjusting screw 340 and the rigid support ring 320 can move synchronously along the axis of the rigid support ring 320 and rotate relative to each other around the axis of the rigid support ring 320.

[0053] When it is necessary to move a certain second isolation diaphragm 300 in the vertical direction, the operator rotates the adjusting screw 340. Since the adjusting screw 340 is threaded onto the instrument body 100, the adjusting screw 340 rotates and moves along its axis. Since the rigid support ring 320 and the adjusting screw 340 can move synchronously along the axis of the rigid support ring 320 and rotate relative to each other around the axis of the rigid support ring 320, the rigid support ring 320 moves synchronously. Since the rigid support ring 320 is located at the upper end of the second isolation diaphragm 300, the second isolation diaphragm 300 moves synchronously, thus making the second isolation diaphragm 300 move in the vertical direction.

[0054] It should be further explained that when it is necessary to move multiple second isolation membranes 300 upward, each second isolation membrane 300 is moved sequentially from top to bottom; conversely, when it is necessary to move multiple second isolation membranes 300 downward, each second isolation membrane 300 is moved sequentially from bottom to top.

[0055] It should be further explained that, in order to ensure that the adjusting screw 340 is threadedly and sealed to the instrument body 100, the thread of the adjusting screw 340 can be a tapered pipe thread. When the adjusting screw 340 is tightened, the tooth profiles of the external thread of the screw 340 and the internal thread on the instrument body 100 are pressed against each other to form an interference fit, which can improve the sealing performance. In addition, thread sealing grease can be evenly applied to the tooth side of the adjusting screw 340 each time it is adjusted to take into account both lubrication and sealing.

[0056] Furthermore, to facilitate the connection between the adjusting screw 340 and the rigid support ring 320, a flange 330 can be provided at the upper end of the rigid support ring 320, so that the flange 330 can be connected to the adjusting screw 340.

[0057] Furthermore, in order to enable the adjusting screw 340 and the rigid support ring 320 to move synchronously along the axis of the rigid support ring 320 and rotate relative to each other around the axis of the rigid support ring 320, the flange platform 330 corresponding to each second isolation diaphragm 300 can be threadedly connected to two adjusting screws 340. When rotating, the two adjusting screws 340 are rotated simultaneously, so that the flange platform 330 can only drive the corresponding second isolation diaphragm 300 to move in the vertical direction through the mutual limiting of the two adjusting screws 340.

[0058] In a further embodiment, such as Figure 3 and Figure 4 As shown, two adjacent rigid support rings 320 are slidably connected in the horizontal direction.

[0059] This design is intended to ensure airtightness and prevent the medium liquid in the medium liquid tank 112 from entering the filling liquid tank 111 through the gaps between the rigid support rings 320.

[0060] Furthermore, to enhance the seal and reduce wear on the rigid support ring 320, a sealing ring 350 can be provided between two adjacent rigid support rings 320. Specifically, annular grooves can be opened on both the inner and outer circumferential surfaces of the rigid support ring 320, and the annular grooves of two adjacent rigid support rings 320 are positioned correspondingly. During installation, sealant is first used to adhere the sealing ring 350 to one of the two corresponding annular grooves. Then, the two rigid support rings 320 are slid against each other until the two annular grooves are positioned correspondingly. In this way, the sealing ring 350 is installed in the two corresponding annular grooves.

[0061] In a further embodiment, such as Figure 4As shown, a first elastic element 360 is provided between each of two adjacent second isolation diaphragms 300. The first elastic element 360 is preferably an arc-shaped spring with its opening facing downwards. In the two adjacent second isolation diaphragms 300, the top of the arc-shaped spring is located on the lower surface of the rigid support ring 320 corresponding to the upper second isolation diaphragm 300, and the two bottom wobbling feet of the arc-shaped spring are located on the upper surface of the rigid support ring 320 corresponding to the lower second isolation diaphragm 300. The first elastic element 360 is used to prevent the two adjacent second isolation diaphragms 300 from approaching each other in the vertical direction. The top of the flange platform 330 corresponding to the uppermost second isolation diaphragm 300 is located on the top wall of the mounting ring groove 110.

[0062] The first elastic element 360 serves two purposes. First, it acts as a connector, linking multiple second isolation diaphragms 300 together so that they can only slide relative to each other within a certain range. Second, the elastic deformation of the first elastic element 360 increases the positive pressure between the rigid support rings 320 corresponding to the stacked second isolation diaphragms 300, thereby enhancing the sealing performance.

[0063] It is understandable that when the temperature of the filling liquid increases, the volume of the filling liquid will expand, resulting in a larger force exerted by the filling liquid on the sensing diaphragm. To solve this problem, in a further embodiment, such as... Figures 3-5 As shown, a first isolation ring 410 and a second isolation ring 420 are provided radially from the outside to the inside within the mounting ring groove 110 and above the first isolation diaphragm 200. The second isolation ring 420 is used to divide the filling liquid tank 111 into an inner tank 1111 and an outer tank 1112. A separating ring 430 is provided between the first isolation ring 410 and the second isolation ring 420 to divide the outer tank 1112 into a lower tank 11121 and an upper tank 11122. An adjusting ring 440 is slidably connected inside the upper tank 11122. The adjusting ring 440 and the separating ring 430 are spaced apart vertically to form a compensation chamber 11123. The compensation chamber 11123 is connected to the inner tank 1111, and both the compensation chamber 11123 and the inner tank 1111 are filled with filling liquid. The adjusting ring 440 can move vertically, thereby changing the volume of the compensation chamber 11123. The volume of the compensation chamber 11123 is positively correlated with the temperature of the filling liquid.

[0064] When the filling fluid absorbs heat from the medium fluid and its temperature rises, the filling fluid in both the inner tank 1111 and the compensation chamber 11123 expands due to heat. Since the volume of the compensation chamber 11123 is positively correlated with the temperature of the filling fluid, the volume of the compensation chamber 11123 gradually increases with the increase of temperature. Since the total amount of filling fluid in the compensation chamber 11123 and the inner tank 1111 remains constant, increasing the volume of the compensation chamber 11123 can effectively reduce the additional pressure effect of liquid volume expansion on the sensing diaphragm, so that the temperature change of the medium fluid has less interference with the sealing detection of the medium fluid, thereby reducing the error.

[0065] It should also be noted that, in order to connect the compensation chamber 11123 with the inner tank 1111, specifically, multiple flow holes can be opened circumferentially at equal intervals on the second isolation ring 420.

[0066] In a further embodiment, such as Figure 5 As shown, a connecting rod 510 is provided at the lower end of the adjusting ring 440. The connecting rod 510 passes through the separating ring 430 downward and is slidably and sealingly connected with the separating ring 430. A sensing ring 520 is provided at the lower end of the connecting rod 510. The sensing ring 520 is slidably connected with the wall of the lower tank 11121, and the lower tank 11121 is filled with filling liquid.

[0067] When the temperature in the lower tank 11121 rises, the volume of the filling liquid in the lower tank 11121 expands and pushes the sensing ring 520 to move upward. The sensing ring 520 drives the connecting rod 510 to move synchronously, and the connecting rod 510 drives the adjusting ring 440 to move synchronously. Since the adjusting ring 440 moves upward, the distance between the adjusting ring 440 and the separating ring 430 becomes larger, so the volume of the compensation chamber 11123 formed by the adjusting ring 440 and the separating ring 430 increases.

[0068] Furthermore, such as Figure 8 As shown, in order to facilitate the movement of the sensing ring 520, a vertical guide groove 411 is provided on the inner peripheral wall of the first isolation ring 410. The vertical guide groove 411 extends in the vertical direction, and a guide block is provided on the outer peripheral surface of the sensing ring 520. The guide block is slidably connected in the vertical guide groove 411.

[0069] In a further embodiment, such as Figure 5 As shown, a second elastic element 530 is provided between the adjusting ring 440 and the top wall of the mounting ring groove 110. The second elastic element 530 prevents the adjusting ring from approaching the top wall of the mounting ring groove 110. The second elastic element 530 is specifically a compression spring. The upper end of the second elastic element 530 is provided on the top wall of the mounting ring groove 110, and the lower end of the second elastic element 530 is provided on the adjusting ring 440.

[0070] The second elastic element 530 is provided to precisely control the volume change of the compensation chamber 11123 according to the expansion coefficient of the filling fluid, so as to further reduce the error and improve the sealing detection accuracy.

[0071] It should also be noted that a constant pressure hole 115 is provided on the connecting part 102. The constant pressure hole 115 is connected to the chamber between the adjusting ring 440 and the inner top wall of the mounting ring groove 110, so that the pressure in the chamber is always at standard atmospheric pressure, thereby reducing variables and facilitating precise control of the volume change of the compensation chamber 11123 according to the expansion coefficient of the filling fluid, so as to further reduce errors and improve the sealing detection accuracy.

[0072] In a further embodiment, the filling liquid is silicone oil.

[0073] Silicone oil has a much lower compressibility than water and ordinary mineral oil. Within a pressure range of 0-100 MPa, its volume hardly changes with pressure, which can accurately transfer the deformation of the second isolation diaphragm 300 to the sensing diaphragm to ensure detection accuracy.

[0074] In a further embodiment, both the first isolation diaphragm 200 and the second isolation diaphragm 300 are corrugated diaphragms.

[0075] Temperature fluctuations in industrial media can cause thermal expansion of the first isolation diaphragm 200 and the second isolation diaphragm 300. By making the diaphragms corrugated, the thermal expansion can be absorbed through the small corrugations, reducing pressure transmission errors caused by thermal deformation.

[0076] A method for testing the seal of a boiler pressure vessel, using the aforementioned boiler pressure vessel seal testing device, includes the following steps:

[0077] S100, determine the sealing test conditions, that is, determine whether the required testing accuracy for the sealing test conditions is extremely high, medium-high, or medium-low.

[0078] S200, rotate the adjusting screw 340 to adjust the number of the stacked second isolation diaphragms 300.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A sealing detection device for a boiler pressure vessel, characterized in that, include: The instrument body has a mounting ring groove at the lower end; The first isolation diaphragm is disposed in the mounting ring groove, and the mounting ring groove is separated into a filling liquid tank and a medium liquid tank. There are multiple second isolation diaphragms, which are arranged vertically below the first isolation diaphragm, and all of the multiple second isolation diaphragms can move vertically. The surface of the second isolation diaphragm has multiple vent holes evenly spaced around its circumference, and the vent holes on adjacent second isolation diaphragms are staggered. Each of the second isolation diaphragms has a rigid support ring at its upper end, and an adjusting screw is connected to the upper end of the rigid support ring. The adjusting screw is threaded and sealed to the instrument body, and the adjusting screw and the rigid support ring can move synchronously along the axis of the rigid support ring and rotate relative to each other around the axis of the rigid support ring. A first isolation ring and a second isolation ring are spaced apart radially from the outside to the inside within the mounting ring groove, located above the first isolation diaphragm. The second isolation ring is used to divide the filling liquid tank into an inner tank and an outer tank. A separating ring is provided between the first and second isolation rings to divide the outer tank into a lower tank and an upper tank. An adjusting ring is slidably connected inside the upper tank. The adjusting ring and the separating ring are spaced apart vertically to form a compensation chamber. The compensation chamber is connected to the inner tank, and both the compensation chamber and the inner tank are filled with filling liquid. The adjusting ring can move vertically, thereby changing the volume of the compensation chamber, and the volume of the compensation chamber is positively correlated with the temperature of the filling liquid.

2. The sealing detection device for a boiler pressure vessel according to claim 1, characterized in that, Two adjacent rigid support rings are slidably connected in the horizontal direction.

3. The sealing detection device for a boiler pressure vessel according to claim 2, characterized in that, A first elastic element is provided between each of the two adjacent second isolation diaphragms. The first elastic element is used to prevent the two adjacent second isolation diaphragms from getting close to each other in the vertical direction.

4. The sealing detection device for a boiler pressure vessel according to claim 1, characterized in that, A connecting rod is provided at the lower end of the adjusting ring. The connecting rod passes through the dividing ring downward and is slidably connected to the dividing ring. A sensing ring is provided at the lower end of the connecting rod and is slidably connected to the wall of the lower trough.

5. A sealing detection device for a boiler pressure vessel according to claim 4, characterized in that, A second elastic element is provided between the adjusting ring and the top wall of the mounting ring groove. The second elastic element prevents the adjusting ring from approaching the top wall of the mounting ring groove.

6. The sealing detection device for a boiler pressure vessel according to claim 1, characterized in that, The filling fluid is silicone oil.

7. The sealing detection device for a boiler pressure vessel according to claim 1, characterized in that, Both the first and second isolation diaphragms are corrugated diaphragms.

8. A method for testing the seal of a boiler pressure vessel, using the boiler pressure vessel seal testing device according to any one of claims 1-7, characterized in that, Includes the following steps: S100, determine the sealing test conditions, that is, determine whether the required testing accuracy for the sealing test conditions is extremely high, medium-high, or medium-low. S200, rotate the adjusting screw to adjust the number of the second isolation diaphragms in the stacked configuration.

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