A reheater test device

Abstract

The present invention relates to the technical field of nuclear power maintenance equipment, and provides a reheater testing device, comprising: a pressure plate assembly, which is used to enclose with a surface to form a closed liquid injection cavity; a push piece, which is used to be accommodated in a box body, and the push piece pushes on the surface of the pressure plate assembly away from the tube sheet along its own length direction; an adjusting assembly, which is telescopically abutted between the push piece and the box body, and the telescopic direction of the adjusting assembly is perpendicular to the pushing direction of the push piece; a fixing assembly, which is used to be fixed on the box body, and the fixing assembly abuts against one end of the push piece away from the pressure plate assembly to apply a thrust force on the push piece; and a testing assembly, which is used to connect the liquid injection cavity to inject test liquid; the reheater testing device provided by the present invention can adjust the longitudinal position of the push piece by arranging the adjusting assembly, and then rely on the push piece to drive the adjustment of the longitudinal position of the pressure plate assembly, so as to avoid misalignment between the pressure plate and the tube sheet, thereby causing leakage of the liquid injection cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power maintenance equipment, and more specifically, to a reheater testing device. Background Art

[0002] The steam-water separator reheater is an important heat exchange equipment in nuclear power plants. During the overhaul of the steam-water separator reheater, the internal tube bundle needs to be pressure tested and leak tested. Figure 1 As shown, the existing steam-water separation reheater 1 includes a tube bundle 11, a tube sheet 12, a box 13, a box flange 14, an external pipe 15, and an external pipe isolation valve 16, wherein the box 13 is a cylinder, and the box flange 14 is spaced a preset distance from the tube sheet 12; the existing first reheater test device 2 includes a first test flange 21, a first test gasket 22, a first test bolt, a first test nut, a water injection isolation valve 23, an exhaust valve 24, a pressure gauge 25, a pressure test isolation valve 26, a pressure test pipe 27, a pressure test pump 28, and a pressure test water tank 29. Existing test method: Before the first reheater test device 2 is pressurized, the external pipe isolation valve 16 on the box body 13 needs to be closed, the pressure test isolation valve 26 needs to be closed, the water injection isolation valve 23 and the exhaust valve 24 need to be opened, water needs to be injected into the box body 13 through the water injection isolation valve 23, and the water injection isolation valve 23 and the exhaust valve 24 need to be closed after the water is filled, the pressure test pump 28 needs to be started, the pressure test isolation valve 26 needs to be opened to pressurize the tube bundle 11, and the tube bundle 11 needs to be checked for leaks. Finally, the pressure gauge 25 needs to be used for observation, and the work ends after the pressure test and pressure maintenance are qualified.

[0003] However, the first reheater test device 2 has the following problems in practical application:

[0004] When the first reheater test device 2 is used, the pressure gauge 25 often has difficulty in increasing pressure. Because the external pipe 15 includes several branches such as a drain pipe and an instrument pipe, the external pipe isolation valve 16 has the hidden danger of internal leakage after long-term operation. Therefore, the external pipe isolation valve 16 needs to be inspected, repaired or replaced in advance before the pressure test, which increases the maintenance workload. In addition, since the box 13 needs to be filled with water before the pressure test, and the water storage capacity of the pressure test water tank 29 is small, it cannot meet the water filling requirements of the box 13, and during the overhaul, the external water source used on site needs to be used under the condition of operation permission, which shortens the time window for the pressure test operation and increases the manpower and time cost of equipment leak detection and maintenance.

[0005] In order to ensure the time window for pressure testing and reduce the amount of water injection, the first reheater test device 2 was improved, such as Figure 2 The second reheater test device 3 shown in FIG. Figure 1The first test gasket 22 at the first test flange 21 is cancelled, and the second pressure plate 32 and the second sleeve 33 are added. The second test gasket 31 is arranged between the second pressure plate 32 and the tube sheet 12, and the second sleeve 33 is pushed against the second pressure plate 32. The second reheater test device 3 can theoretically reduce the water consumption for pressure testing and shorten the pressure testing time. However, in the actual pressure testing process, due to the eccentricity generated when the second test flange, the second sleeve 33 and the second pressure plate 32 are assembled, the misalignment occurs. In this way, when the second test bolt and the second test nut are tightened, the overall contact surface of the second pressure plate 32 and the tube sheet 12 is unevenly stressed. When the pressure of the pressure test increases, the sealing surface of the second pressure plate 32 and the tube sheet 12 is prone to leakage. At this time, the second reheater test device 3 needs to be depressurized, the second pressure plate 32 or the second sleeve 33 needs to be readjusted or disassembled, and the pressure test pump 28 needs to be started again after water injection to increase the pressure. In this way, several adjustments are required to meet the pressure testing requirements. Not only the work efficiency is not significantly improved, but the pressure testing workload is increased. Summary of the invention

[0006] The object of the present invention is to provide a reheater test device to solve the technical problem in the prior art that the sealing surface between the pressure plate of the reheater test device and the tube sheet of the reheater is easily misaligned and leaks occur.

[0007] To achieve the above object, the technical solution adopted by the present invention is a reheater testing device, comprising:

[0008] A pressure plate assembly is used to be accommodated in the box of the reheater and is covered on the surface of the tube sheet of the reheater away from the tube bundle, and is enclosed with the surface to form a closed liquid injection cavity;

[0009] A push piece, which is used to be accommodated in the box body, wherein the length direction of the push piece is perpendicular to the surface of the pressure plate assembly, and the push piece pushes against the surface of the pressure plate assembly away from the tube sheet along its length direction;

[0010] An adjusting component, which is used to be accommodated in the box, and the adjusting component can be telescopically abutted between the pushing member and the box, and the telescopic direction of the adjusting component is perpendicular to the pushing direction of the pushing member;

[0011] A fixing assembly, used for fixing on the box body, wherein the fixing assembly abuts against an end of the push member away from the pressure plate assembly to apply a push force on the push member; and

[0012] The testing component is used to communicate with the liquid injection cavity to inject the testing liquid.

[0013] In one embodiment, the push member is a sleeve, a through hole is formed on the wall of the sleeve, a first operating hole is formed at the end of the sleeve away from the pressure plate assembly, one end of the adjustment assembly abuts against the inner wall of the sleeve opposite to the through hole, and the other end of the adjustment assembly passes through the through hole and is telescopically abutted against the inner surface of the box.

[0014] In one embodiment, the adjustment assembly includes an adjustment wrench rotatably connected to the inner wall of the sleeve, an adjustment nut fixedly connected to the adjustment wrench, and an adjustment rod with one end threadedly connected to the adjustment nut and the other end abutting against the inner surface of the box.

[0015] In one embodiment, the sleeve is flat in shape, and the transverse width of the sleeve is smaller than the longitudinal width.

[0016] In one embodiment, a plurality of holes are provided on the wall of the sleeve.

[0017] In one embodiment, the pressure plate assembly includes a pressure plate and a first boss protruding from a surface of the pressure plate away from the tube plate, and a fixing hole cooperating with the first boss is formed at one end of the sleeve away from the first operating hole.

[0018] In one embodiment, the pressure plate assembly further includes a sealing ring, and the surface of the pressure plate abutting against the tube plate is provided with a sealing groove surrounding the periphery of the injection cavity, and the sealing ring is accommodated in the sealing groove.

[0019] In one embodiment, the pressure plate assembly also includes side baffles located on both sides of the sleeve in the width direction and a pressure cover movably connected to the side baffles, the pressure cover and the side baffles are used to enclose the inner surface of the box body to form a sealing cavity for filling the sealing material, and the pressure cover can move toward the side baffles to squeeze the sealing material in the sealing cavity.

[0020] In one embodiment, the fixing assembly includes a flange member that is fastened to the box body, and the flange member is provided with a through hole that communicates with the first operating hole.

[0021] In one embodiment, the fixing assembly further includes a second boss protruding from the flange and cooperating with the first operating hole.

[0022] The beneficial effects of the reheater testing device provided by the present invention are:

[0023] The fixing assembly is fixed on the box body to apply a thrust force to the thrust piece, thereby driving the thrust piece to push the pressure plate assembly, thereby pressing the pressure plate assembly against the surface of the tube sheet, so that the pressure plate assembly and the tube sheet are enclosed to form a closed injection cavity, and the test assembly can inject the test liquid into the injection cavity; the longitudinal position of the thrust piece can be adjusted by setting an adjustment assembly, and the longitudinal position of the pressure plate assembly can be adjusted by relying on the thrust piece, thereby avoiding the pressure plate from deviating from the tube sheet, misalignment between the tube sheet and the formation of gaps in the injection cavity to cause leakage, resulting in test failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a schematic diagram of a first reheater test device of the prior art;

[0026] Figure 2 is a schematic diagram of a second reheater test device of the prior art;

[0027] Figure 3 is a schematic diagram of a reheater testing device provided in an embodiment of the present invention;

[0028] Figure 4 is another schematic diagram of a reheater testing device provided in an embodiment of the present invention;

[0029] Figure 5 is a three-dimensional structural diagram of a sleeve provided in an embodiment of the present invention;

[0030] Figure 6 is a cross-sectional view of an adjustment assembly, a push member and a box body provided by an embodiment of the present invention;

[0031] Figure 7 yes Figure 3 Enlarged view of point "A";

[0032] Figure 8 It is a left side view of the flange provided in the embodiment of the present invention.

[0033] The reference numerals in the figures are:

[0034] 1-reheater; 11-tube bundle; 12-tube sheet; 13-tank; 14-tank flange; 15-external pipe; 16-external pipe isolation valve;

[0035] 2-first reheater test device; 21-first test flange; 22-first test gasket; 23-water injection isolation valve; 24-exhaust valve; 25-pressure gauge; 26-pressure test isolation valve; 27-pressure test pipe; 28-pressure test pump; 29-pressure test water tank;

[0036] 3-second reheater test device; 31-second test seal; 32-second pressure plate; 33-second sleeve;

[0037] 4-reheater test device; 41-pressure plate assembly; 411-pressure plate; 412-first boss; 413-sealing ring; 414-side baffle; 4141-retaining ring; 4142-packing ring; 415-pressure cover; 42-thrust member; 421-through hole; 422-first operating hole; 423-empty hole; 424-fixing hole; 43-adjusting assembly; 431-adjusting wrench; 432-adjusting nut; 433-adjusting rod; 44-fixing assembly; 441-flange; 442-through hole; 443-second operating hole; 444-second boss; 45-test assembly. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The specific implementation of the present invention is described in more detail below in conjunction with specific embodiments:

[0042] like Figure 3 and Figure 4 As shown, a reheater test device 4 provided in an embodiment of the present invention is used to test the internal tube bundle 11 of the reheater 1, mainly for pressure testing and leak detection. In order to solve the problems of many leaks, long operation time and large amount of repeated work in the reheater 1 during the pressure test, we have redesigned the reheater test device 4. The reheater test device 4 provided in this embodiment is suitable for a specific reheater 1 (the distance between the tube sheet 12 and the box flange 14 is large and the sealing pressure requirement is high) such as a steam-water separation reheater 1. Specifically, the reheater 1 in this embodiment includes a box 13, a tube sheet 12 and a tube bundle 11, and the box 13 is used to accommodate the tube sheet 12, and the tube sheet 12 is connected to the tube bundle 11.

[0043] The reheater testing device 4 of this embodiment includes a pressure plate assembly 41, a push member 42, an adjustment assembly 43, a fixing assembly 44 and a testing assembly 45;

[0044] The pressing plate assembly 41 is accommodated in the box body 13 of the reheater 1 and is used to cover the surface of the tube sheet 12 of the reheater 1 away from the tube bundle 11, and enclose the surface to form a closed liquid injection cavity;

[0045] The push member 42 is used to be accommodated in the box body 13. The length direction of the push member 42 is perpendicular to the surface of the pressure plate assembly 41. The push member 42 pushes against the surface of the pressure plate assembly 41 away from the tube sheet 12 along its length direction.

[0046] The adjusting component 43 is used to be accommodated in the box body 13. The adjusting component 43 is telescopically connected between the push member 42 and the box body 13. Specifically, one end of the adjusting component 43 abuts against the push member 42, and the other end thereof abuts against the inner surface of the box body 13 telescopically. The telescopic direction of the adjusting component 43 is perpendicular to the push direction of the push member 42.

[0047] The fixing assembly 44 is used to be fixed on the box body 13 , and the fixing assembly 44 abuts against an end of the push member 42 away from the pressure plate assembly 41 to apply a push force on the push member 42 ; and

[0048] The testing assembly 45 is used to communicate with the liquid injection cavity to inject the testing liquid.

[0049] The working principle of the reheater testing device 4 provided in this embodiment is as follows:

[0050] The pressure plate assembly 41 is placed in the box body 13. The pressure plate assembly 41 is in the shape of a cover body, which can be covered on the surface of the tube sheet 12 away from the tube bundle 11. At this time, the pressure plate assembly 41 and the tube sheet 12 are enclosed to form a closed injection cavity. However, the pressure plate assembly 41 is connected to the tube sheet 12 in an abutting manner. Therefore, the pressure plate assembly 41 may be slightly displaced due to its own gravity during the injection process, and misaligned with the tube sheet 12, thereby generating a gap between the two and causing leakage of the test liquid; a push piece 42 is provided on the surface of the pressure plate assembly 41 away from the tube sheet 12, and a fixing assembly 44 fixed to the box body 13 is provided on the push piece 42. The fixing assembly 44 applies a thrust force to the push piece 42, thereby driving the push piece 42 to push the pressure plate assembly 41, thereby improving The friction between the pressure plate assembly 41 and the tube sheet 12 prevents the two from being misaligned; in addition, the extension and retraction direction of the adjustment assembly 43 is perpendicular to the pushing direction of the push piece 42, and the pushing direction is perpendicular to the surface of the tube sheet 12. Therefore, the extension and retraction direction of the adjustment assembly 43 is parallel to the surface of the tube sheet 12. By changing the extension length of the adjustment assembly 43, the longitudinal position of the push piece 42 can be changed, and then the pressure plate assembly 41 is driven by the push piece 42 to move, thereby adjusting the relative position of the pressure plate assembly 41 and the tube sheet 12 in the longitudinal direction (in this embodiment, the longitudinal direction is the vertical direction). Therefore, when the two are misaligned and leakage occurs, the extension length of the adjustment assembly 43 can be changed to make the pressure plate assembly 41 return to the initial position and face the tube sheet 12, thereby avoiding the formation of gaps and causing leakage.

[0051] The beneficial effects of the reheater testing device 4 provided in this embodiment are:

[0052] The fixing assembly 44 is fixed on the box body 13 to apply a thrust force to the thrust member 42, thereby driving the thrust member 42 to push the pressure plate assembly 41, thereby pressing the pressure plate assembly 41 against the surface of the tube sheet 12, so that the pressure plate assembly 41 and the tube sheet 12 are enclosed to form a closed injection cavity, and the test assembly 45 injects the test liquid into the injection cavity; the adjustment assembly 43 can be used to adjust the longitudinal position of the thrust member 42, and then the longitudinal position of the pressure plate assembly 41 is adjusted by relying on the thrust member 42 to avoid the pressure plate from deviating from the tube sheet 12, and then being misaligned with the tube sheet 12, so that a gap is generated in the injection cavity and leakage occurs, causing the test failure.

[0053] Please also read Figure 5 and Figure 6In one embodiment, the push member 42 is a sleeve, a through hole 421 is formed on the sleeve wall, a first operating hole 422 is formed on the end of the sleeve away from the pressure plate assembly 41, one end of the adjustment assembly 43 abuts against the inner wall of the sleeve opposite to the through hole 421, and the other end of the adjustment assembly 43 passes through the through hole 421 and abuts against the inner surface of the box body 13 in a telescopic manner. In this embodiment, the adjustment assembly 43 is partially accommodated in the sleeve, and the end of the sleeve away from the pressure plate assembly 41 is formed with a first operating hole 422, which is connected to the interior of the sleeve, so that maintenance personnel can reach into the interior of the sleeve from the first operating hole 422 to change the telescopic length of the adjustment assembly 43.

[0054] Specifically, the cross-sectional area of ​​the sleeve is less than or equal to the cross-sectional area of ​​the tube sheet 12; preferably, the cross-sectional area of ​​the sleeve is equal to the cross-sectional area of ​​the tube sheet 12, so that the end face of the sleeve can overlap with the surface of the tube sheet 12, so that the thrust applied by the sleeve can be evenly applied to the tube sheet 12, thereby achieving a tight docking effect. In this embodiment, because the cross-sectional area of ​​the sleeve is large, the sleeve can be designed as a hollow structure, and the adjustment component 43 is partially accommodated inside the sleeve. Compared with setting the adjustment component 43 between the outer wall of the sleeve and the inner surface of the box 13, the sleeve with the above hollow structure design can make the adjustment component 43 have a longer length in the limited space inside the box 13, which is convenient for maintenance personnel to operate and reduces the difficulty of operation for maintenance personnel.

[0055] Specifically, the adjustment assembly 43 includes an adjustment wrench 431 rotatably connected to the inner wall of the sleeve, an adjustment nut 432 connected to the adjustment wrench 431, and an adjustment rod 433, one end of which is threadedly connected to the adjustment nut 432 and the other end of which abuts against the inner surface of the box body 13. In this embodiment, the maintenance personnel rotate the adjustment wrench 431 to drive the adjustment nut 432 to rotate, thereby driving the adjustment rod 433 to telescopically move. It can be understood that the above design reduces the difficulty of operating the adjustment assembly 43 and improves the operating efficiency of the maintenance personnel.

[0056] Furthermore, the sleeve is flat in shape, and the lateral width of the sleeve (lateral direction is the direction parallel to the horizontal plane) is smaller than the longitudinal width (longitudinal direction is the vertical direction). In this embodiment, the sleeve designed above reduces its own weight compared to the existing cylindrical sleeve at the same length size, and at the same time, in the lateral direction, the width of the sleeve is smaller than the longitudinal width, so that a large space is left between the outer wall of the sleeve and the inner surface of the box body 13 in the lateral direction, which is convenient for maintenance personnel to operate in the space, reducing the difficulty of operation for maintenance personnel.

[0057] Furthermore, a plurality of holes 423 are provided on the wall of the sleeve. It is understandable that by designing a plurality of holes 423, the weight of the sleeve itself is reduced to improve the portability of the reheater test device 4. Specifically, the holes 423 and through holes are evenly distributed on the side wall of the sleeve; preferably, the side wall of the sleeve is provided with three rectangular holes, one of which is a through hole 421 and the other two are holes 423, and this design facilitates installation by maintenance personnel.

[0058] Please also read Figure 3 , Figure 5 and Figure 7 In one embodiment, the pressing plate assembly 41 includes a pressing plate 411 and a first boss 412 protruding from the surface of the pressing plate 411 away from the tube sheet 12, and a fixing hole 424 cooperating with the first boss 412 is provided at one end of the sleeve away from the first operating hole 422. In this embodiment, when the sleeve is pushed against the pressing plate 411, the first boss 412 on the tube sheet 12 is inserted into the fixing hole 424 of the sleeve to avoid a large displacement between the sleeve and the tube sheet 12; due to the problem of machining accuracy, there is still a slight misalignment between the sleeve and the tube sheet 12, and at this time, the adjustment assembly 43 is used to adjust the longitudinal position of the sleeve to avoid a large misalignment between the sleeve and the pressing plate 411.

[0059] In one embodiment, the pressure plate assembly 41 further includes a sealing ring 413. The surface of the pressure plate 411 abutting against the tube sheet 12 is provided with a sealing groove surrounding the periphery of the injection cavity, and the sealing ring 413 is accommodated in the sealing groove. In this embodiment, when the thrust member 42 applies a thrust force, the sealing ring 413 is squeezed by the groove wall of the sealing groove and deformed, thereby blocking the gap between the tube sheet 12 and the pressure plate 411 and improving the sealing of the injection cavity. The prior art uses a rubber flat gasket to seal between the tube sheet 12 and the pressure plate 411. During the actual disassembly and assembly process, the rubber flat gasket is easy to fall off from between the tube sheet 12 and the pressure plate 411, causing sealing failure. The sealing ring 413 of this embodiment is accommodated in the sealing groove and is not easy to fall off, thereby ensuring the sealing of the tube sheet 12 when connected to the pressure plate 411, thereby avoiding multiple checks on the sealing, thereby saving the pressing process and time.

[0060] In one embodiment, the pressure plate assembly 41 further includes side baffles 414 located on both sides in the width direction of the sleeve and a pressure cover 415 movably connected to the side baffles 414. The pressure cover 415 and the side baffles 414 are used to enclose the inner surface of the box body 13 to form a sealing cavity for filling the sealing material. The pressure cover 415 can move toward the side baffles 414 to squeeze the sealing material in the sealing cavity. In this embodiment, the pressure cover 415 squeezes the sealing material so that the sealing material and the inner surface of the box body 13 are more tightly combined, thereby improving the sealing performance of the pressure plate assembly 41 on the side of the box body 13.

[0061] Specifically, the side baffle 414 includes a baffle ring 4141 and a packing ring 4142. The radius of the packing ring 4142 is smaller than the radius of the baffle ring 4141. The packing ring 4142 is embedded in or welded to the baffle ring 4141. The pressure cover 415 is threadedly connected to the packing ring 4142. The pressure cover 415, the packing ring 4142, the baffle ring 4141 and the inner surface of the box body 13 enclose a sealed cavity.

[0062] Specifically, the sealing material 416 is asbestos packing, which is a packing made by weaving together graphite asbestos wire and heat-resistant lubricating oil. The sealing material 416 has good high temperature resistance.

[0063] In the prior art, Figure 2 As shown, when the pressure of the reheater test device 4 rises to a certain value, the sealing leakage of the pressure plate 411 and the tube sheet 12 is large. Even if the flange is tightened again, the leakage point is difficult to completely eliminate, and the pressure cannot be guaranteed to be in a stable state. In this embodiment, the pressure plate 411 is redesigned and replaced with a new pressure plate assembly 41. The pressure plate assembly 41 includes a pressure plate 411, a retaining ring and a packing ring 4142, which are welded into one body after assembly. A sealing cavity is designed on the outer circle of the packing ring 4142 of the pressure plate assembly 41 for installing asbestos packing pads (generally 2 to 3 layers). The outer circumference of the packing ring 4142 is evenly distributed with threaded holes. The pressure cover 415 is threadedly connected to the packing ring 4142 by bolts. The packing gland 415 seals the pressure plate assembly 41 in the radial direction by pressing the asbestos packing pad.

[0064] Please also see Figure 3 and Figure 8 In one embodiment, the fixing assembly 44 includes a flange 441 that is fastened to the housing 13, and the flange 441 is provided with a through hole 442 that communicates with the first operating hole 422. In this embodiment, the connection convenience of the fixing assembly 44 can be improved by connecting the flange 441 to the housing 13, and the operation difficulty of the maintenance personnel is reduced by providing the through hole 442 that communicates with the first operating hole 422.

[0065] Furthermore, the through hole 442 is provided in the middle of the flange 441, and the flange 441 is further provided with a second operating hole 443 around the through hole 442, and the second operating hole 443 corresponds to the threaded connector of the gland 415, and the maintenance personnel can extend the tool from the second operating hole 443 into the gland 415 to operate the threaded connector. Specifically, the second operating holes 443 are arranged on the flange 441 along the circumferential direction.

[0066] Please also see Figure 3 and Figure 5In one embodiment, the fixing assembly 44 further includes a second boss 444 protruding from the flange 441 and cooperating with the first operating hole 422. It is understandable that when the fixing assembly 44 is matched with the sleeve, the second boss 444 is inserted into the first operating hole 422 of the sleeve to limit the longitudinal position of the sleeve, thereby preventing a large eccentric displacement between the sleeve and the tube sheet 12, which may cause leakage of the injection cavity.

[0067] In summary, the specific working principle of the reheater testing device 4 provided in this embodiment is as follows:

[0068] The first step is to install the sealing ring 413 and the sealing material on the pressing plate assembly 41. Specifically, the sealing ring 413 is installed in the sealing groove of the pressing plate 411, and the sealing material is installed in the sealing cavity. At this time, the bolts of the gland 415 are not tightened, that is, the gland 415 does not squeeze the sealing material in the sealing cavity.

[0069] The second step is to install the pressure plate assembly 41 into the box body 13, wherein the sealing ring 413 is pressed against the tube sheet 12;

[0070] Step 3: The sleeve is mounted on the first boss 412 of the pressing plate 411, and the sleeve is installed in a direction that the inner wall of the cylinder body facing the through hole 421 is located at the top;

[0071] Step 4: Install the flange 441, insert the second boss 444 on the flange 441 into the first operating hole 422 of the sleeve, connect the flange 441 and the box body 13 with bolts and nuts, and pre-tighten the bolts and nuts;

[0072] Step 5: Insert the adjusting rod 433, adjusting nut 432 and adjusting spanner 431 into the sleeve through the through hole 442 of the flange 441 and the operating hole of the sleeve in turn, and install the adjusting rod 433, adjusting nut 432 and adjusting spanner 431 between the inner wall of the sleeve and the inner surface of the box body 13. The installation position and direction are such that the adjusting rod 433 is supported on the inner surface of the box body 13, and the adjusting nut 432 is pressed against the inner wall of the sleeve facing the through hole 421. The center position of the pressing plate assembly 41 is adjusted by rotating the adjusting nut 432 with the adjusting spanner 431 to prevent the pressing plate assembly 41 from sinking due to its own gravity and causing misalignment with the tube sheet 12.

[0073] Step 6. After the pressure plate assembly 41 is adjusted, tighten the bolts and nuts on the flange 441, connect the test assembly 45 to perform a pressure test. If water seeps out of the pressure cover 415 during the pressure test, use a special tool (long-handled socket wrench) to reach in from the second operating hole 443 of the flange 441, adjust the pressure cover 415 to extrude the sealing material, and the sealing material is deformed under pressure to achieve a sealing effect.

[0074] The reheater testing device 4 provided in this embodiment can be used as an optimal method for pressure testing the tube sheet 12 of the reheater 1 in the nuclear power field, achieving the goal of completing the pressure testing process in one go, ensuring the quality of the pressure testing, and improving the work efficiency of the pressure testing.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A reheater testing device, characterized in that: include: A pressure plate assembly is used to be accommodated in the box of the reheater and is covered on the surface of the tube sheet of the reheater away from the tube bundle, and is enclosed with the surface to form a closed liquid injection cavity; A push piece, which is used to be accommodated in the box body, wherein the length direction of the push piece is perpendicular to the surface of the pressure plate assembly, and the push piece pushes against the surface of the pressure plate assembly away from the tube sheet along its length direction; An adjusting component, which is used to be accommodated in the box, and the adjusting component can be telescopically abutted between the pushing member and the box, and the telescopic direction of the adjusting component is perpendicular to the pushing direction of the pushing member; A fixing assembly, used for fixing on the box body, wherein the fixing assembly abuts against an end of the push member away from the pressure plate assembly to apply a push force on the push member; and The testing component is used to communicate with the liquid injection cavity to inject the testing liquid.

2. The reheater testing device according to claim 1, characterized in that: The push member is a sleeve, a through hole is provided on the wall of the sleeve, a first operating hole is provided at the end of the sleeve away from the pressure plate assembly, one end of the adjustment assembly abuts against the inner wall of the sleeve opposite to the through hole, and the other end of the adjustment assembly passes through the through hole and abuts against the inner surface of the box in a telescopic manner.

3. The reheater testing device according to claim 2, characterized in that: The adjustment assembly includes an adjustment spanner rotatably connected to the inner wall of the sleeve, an adjustment nut fixedly connected to the adjustment spanner, and an adjustment rod with one end threadedly connected to the adjustment nut and the other end abutting against the inner surface of the box.

4. The reheater testing device according to claim 2, characterized in that: The sleeve is flat in shape, and the transverse width of the sleeve is smaller than the longitudinal width.

5. The reheater testing device according to claim 2, characterized in that: A plurality of holes are also provided on the wall of the sleeve.

6. The reheater testing device according to any one of claims 2 to 5, characterized in that: The pressure plate assembly includes a pressure plate and a first boss protruding from the surface of the pressure plate away from the tube plate, and one end of the sleeve away from the first operating hole is provided with a fixing hole matched with the first boss.

7. The reheater testing device according to claim 6, characterized in that: The pressure plate assembly also includes a sealing ring. The surface of the pressure plate abutting against the tube plate is provided with a sealing groove surrounding the periphery of the injection cavity, and the sealing ring is accommodated in the sealing groove.

8. The reheater testing device according to claim 6, characterized in that: The pressure plate assembly also includes side baffles located on both sides of the sleeve in the width direction and a pressure cover movably connected to the side baffles. The pressure cover and the side baffles are used to enclose the inner surface of the box body to form a sealing cavity for filling with sealing material. The pressure cover can move toward the side baffles to squeeze the sealing material in the sealing cavity.

9. The reheater testing device according to any one of claims 2 to 5, characterized in that: The fixing assembly includes a flange member that is fastened to the box body, and the flange member is provided with a through hole that communicates with the first operating hole.

10. The reheater testing device according to claim 9, characterized in that: The fixing assembly also includes a second boss protruding from the flange and cooperating with the first operating hole.

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