Steam generator water trough plugging mechanism and plugging method

Abstract

The present invention provides a plugging mechanism and a plugging method for a water flow trough of a steam generator. The plugging mechanism includes a plugging plate and a limiting mechanism. One end of the plugging plate is inserted into the water flow trough opened on the supporting plate, and the other end is plugged to one port of the water flow trough. The limiting mechanism includes a limiting plate and a mounting rod connected to the limiting plate. The limiting plate straddles the other port of the water flow trough. The mounting rod passes through the water flow trough and the plugging plate and extends to the outside of the plugging plate. One end of the mounting rod is connected to the plugging plate through a locking component. For the above-mentioned plugging mechanism of the water flow trough of the steam generator, the plugging plate and the limiting plate are arranged at the opposite ends of the water flow trough. The limiting plate, in cooperation with the mounting rod and the locking component, can plug and install the plugging plate at one port of the water flow trough. The installation is convenient and the required components are greatly reduced, which is beneficial to reducing the deposition of corrosion products and chemical substances.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generators, and particularly relates to a water chute plugging mechanism and a plugging method for a steam generator. Background Art

[0002] A plurality of support plates are axially arranged on the heat transfer tube bundle of the steam generator, and the support plates are used to increase the support stiffness of the heat transfer tube bundle and improve the ability of the heat transfer tube bundle to resist flow-induced vibration.

[0003] To improve the problem of uneven flow field distribution of the heat transfer tube bundle of the steam generator, square grooves can be arranged on the support plates as water chutes, and the function of the in-service inspection passage can be taken into account.

[0004] However, since the flow resistance in the pipe gallery area is smaller than that in the tube passing area, the local flow velocity of the secondary side fluid of the steam generator in the pipe gallery area is relatively large. In particular, the flow velocity increases significantly in the square groove area, and the relatively large local flow velocity will increase the wear risk of the heat transfer tubes of the steam generator.

[0005] Based on this, the inventors of the present application propose a water chute plugging mechanism and a plugging method for a steam generator in order to solve the above technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defect that the local flow velocity of the support plate of the steam generator at the water chute is too large in the prior art, resulting in a reduction in the safety and reliability of the steam generator, and to provide a water chute plugging mechanism and a plugging method for a steam generator.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a water chute plugging mechanism for a steam generator, which is characterized by including:

[0009] A plugging plate, one end of which is inserted into the water chute opened on the support plate, and the other end of which plugs to one port of the water chute;

[0010] A limiting mechanism, including a limiting plate and a mounting rod connected to the limiting plate. The limiting plate straddles the other port of the water chute. The mounting rod passes through the water chute and the plugging plate and extends to the outside of the plugging plate. One end of the mounting rod is connected to the plugging plate through a locking component.

[0011] According to an embodiment of the present invention, the plugging plate includes a plugging portion and a mounting portion. The size of the plugging portion corresponds to the size of the water chute, and the plugging portion is used to be inserted into the water chute;

[0012] The installation part is installed on one end face of the blocking part. The size of the installation part is at least larger than the cross-sectional size of the water flow groove. The installation part is used to straddle and block one port of the water flow groove.

[0013] According to an embodiment of the present invention, the height of the blocking part is less than the depth of the water flow groove.

[0014] According to an embodiment of the present invention, the limiting plate has a length extension direction and a width extension direction;

[0015] The dimension of the limiting plate in the length extension direction is larger than the width direction of the water flow groove, and the dimension of the limiting plate in the width extension direction is less than the width direction of the water flow groove.

[0016] According to an embodiment of the present invention, clamping grooves are respectively formed on opposite end faces of the limiting plate along its length extension direction;

[0017] The clamping grooves are used to be clamped on the groove wall of the supporting plate at the end of the water flow groove to prevent the limiting plate from rotating relative to the outer wall of the water flow groove.

[0018] According to an embodiment of the present invention, an installation hole is formed in the middle of the blocking plate, and one end of the installation rod is inserted into the installation hole and extends to the outside of the blocking plate.

[0019] According to an embodiment of the present invention, the locking assembly includes a first connecting piece and a second connecting piece. The first connecting piece is in threaded cooperation with the installation rod, and the second connecting piece is fixedly connected to the installation rod.

[0020] According to an embodiment of the present invention, one end of the first connecting piece abuts against the blocking plate, and the first connecting piece and the second connecting piece are arranged at intervals;

[0021] The first connecting piece is a locking round nut, and the second connecting piece is a limiting nut.

[0022] According to an embodiment of the present invention, a pressure sensor is provided on one end face of the second connecting piece facing the first connecting piece;

[0023] The distance between the first connecting piece and the second connecting piece is at least less than the depth of the blocking plate inserted into the water flow groove.

[0024] The present invention also provides a method for blocking a water flow groove of a steam generator, which is characterized in that it is realized by using the above-mentioned water flow groove blocking mechanism of the steam generator. The blocking method includes:

[0025] Rotate the length direction of the limiting plate to be consistent with the length direction of the water flow groove;

[0026] Insert the limiting plate into the water chute from one port to the other port and rotate it by 90 degrees so that the limiting plate is bridged to the other port of the water chute;

[0027] Use the locking component to screw along the mounting rod to one end face of the plugging plate, and make the plugging plate plug one port of the water chute.

[0028] The positive and progressive effects of the present invention are as follows:

[0029] For the plugging mechanism of the water chute of the steam generator of the present invention, a plugging plate and a limiting plate are provided at opposite ends of the water chute. The limiting plate, in cooperation with the mounting rod and the locking component, can plug and install the plugging plate at one port of the water chute. The installation is convenient and the required components are greatly reduced, which is beneficial to reducing the deposition of corrosion products and chemical substances. Description of the Drawings

[0030] The above and other features, properties and advantages of the present invention will become more obvious through the following description with reference to the drawings and embodiments, wherein:

[0031] Figure 1 is a schematic structural view of the plugging mechanism of the water chute of the steam generator of the present invention at an angle;

[0032] Figure 2 is a schematic structural view of the plugging mechanism of the water chute of the steam generator of the present invention at another angle;

[0033] Figure 3 For the present invention Figure 1 is a schematic structural view of the plugging mechanism of the water chute of the steam generator during installation;

[0034] Figure 4 is Figure 3 the front view of the plugging mechanism of the water chute of the steam generator shown;

[0035] Figure 5 is a flow chart of the method for plugging the water chute of the steam generator of the present invention.

[0036] 10. Plugging plate; 110. Plugging part; 120. Mounting part; 130. Mounting hole;

[0037] 20. Water chute;

[0038] 30. Limiting mechanism; 310. Limiting plate; 311. Clamping groove; 320. Mounting rod;

[0039] 40. Locking component; 410. First connecting piece; 420. Second connecting piece; 421. Pressure sensor;

[0040] 50. Support plate. Detailed Embodiments

[0041] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0042] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present invention will now be described in detail, which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present invention not only through the actual terms used, but also through the meaning implied by each term.

[0043] Please refer to Figures 1 to 4 , the present invention provides a plugging mechanism for the water chute of a steam generator, including a plugging plate 10 and a limiting mechanism 30. One end of the plugging plate 10 is inserted into the water chute 20 opened on the support plate 50, and the other end is plugged to one port of the water chute 20.

[0044] The limiting mechanism 30 includes a limiting plate 310 and a mounting rod 320 connected to the limiting plate 310. The limiting plate 310 straddles the other port of the water chute 20. The mounting rod 320 passes through the water chute 20 and the plugging plate 10 and extends to the outside of the plugging plate 10. One end of the mounting rod 320 is connected to the plugging plate 10 through a locking component 40.

[0045] The plugging plate 10 of the present invention is used to be inserted into the water chute 20 and is installed at the water chute 20 under the action of the limiting mechanism 30, effectively reducing the local flow rate in the area of the water chute 20 during the operation of the steam generator, retaining the internal passage for in-service inspection of the secondary side of the steam generator, and improving the safety and reliability of the steam generator that has been partially completed, completed, or put into operation.

[0046] Please refer to Figures 1 to 2 , in one embodiment, the plugging plate 10 includes a plugging portion 110 and a mounting portion 120. The size of the plugging portion 110 corresponds to the size of the water chute 20, and the plugging portion 110 is used to be inserted into the water chute 20.

[0047] The mounting portion 120 is installed on one end face of the plugging portion 110. The size of the mounting portion 120 is at least larger than the cross-sectional size of the water chute 20, and the mounting portion 120 is used to straddle and plug one port of the water chute 20.

[0048] In one embodiment, the side of the blocking portion 110 facing away from the mounting portion 120 can be provided with an opening, thereby reducing the overall weight of the blocking plate 10. In some other embodiments, the blocking portion 110 can also be a solid structure.

[0049] The circumferential dimension of the blocking portion 110 is consistent with the cross-sectional dimension of the water flow groove 20 in the direction of its groove depth. Thereby, the gap between the blocking portion 110 and the groove wall of the water flow groove 20 can be reduced, and under the frictional action between the blocking portion 110 and the groove wall of the water flow groove 20, the blocking portion 110 can be further prevented from detaching from the water flow groove 20, improving the installation stability of the blocking portion 110.

[0050] For the mounting portion 120, the circumferential dimension of the mounting portion 120 is at least larger than the cross-sectional dimension of the water flow groove 20 in the direction of the groove depth. Thereby, under the blocking action of the mounting portion 120, water vapor can be prevented from passing through the water flow groove 20 from bottom to top.

[0051] It should be noted that the blocking plate 10 can be made of a metal material or an elastic high-temperature resistant rubber material, which is not limited herein. Preferably, it is made of an elastic high-temperature resistant rubber material. Thereby, the blocking plate 10 is elastically sealed with the water flow groove 20, which is beneficial to improving the blocking effect of the blocking plate 10.

[0052] Specifically, the height of the blocking portion 110 is less than the depth of the water flow groove 20.

[0053] Thereby, the blocking portion 110 not only satisfies the blocking of the water flow groove 20 but also does not affect the installation between the limiting plate 310 and the supporting plate 50.

[0054] In one embodiment, the limiting plate 310 has a length extension direction and a width extension direction; the dimension of the limiting plate 310 in the length extension direction is greater than the width direction of the water flow groove 20, and the dimension of the limiting plate 310 in the width extension direction is less than the width direction of the water flow groove 20.

[0055] It should be noted that to reduce the installation time of the blocking mechanism at the water flow groove 20 of the supporting plate 50, the blocking plate 10 and the limiting mechanism 30 can be pre-assembled. After assembly, the state where the length extension direction of the limiting plate 310 is consistent with the length extension direction of the water flow groove 20 is adjusted. Then, the blocking mechanism is installed from bottom to top through the water flow groove 20, so that the limiting plate 310 passes through the water flow groove 20 and reaches the upper port of the water flow groove 20, and one end of the blocking plate 10 passes through the lower port of the water flow groove 20. Further, the position of the blocking plate 10 is locked by the locking assembly 40.

[0056] Water vapor circulates vertically from bottom to top. Therefore, the lower part of the water flow groove 20 is the upstream of the water vapor, and the upper part of the water flow groove 20 is the downstream of the water vapor, corresponding to the up and down directions of the supporting plate 50.

[0057] When disassembling the plugging mechanism, the locking component 40 can be rotated downward first, so that the limiting plate 310 moves upward a certain distance and then rotates 90 degrees until the length direction of the limiting plate 310 is consistent with the length direction of the water flow groove 20, and the plugging mechanism can be taken out from top to bottom.

[0058] Please refer to Figure 3 and Figure 4 , in an embodiment, clamping grooves 311 are respectively formed on opposite end faces of the limiting plate 310 along its length extension direction. The clamping grooves 311 are used to be clamped on the groove walls at the ends of the supporting plate 50 in the water flow groove 20 to prevent the limiting plate 310 from rotating relative to the outer wall of the water flow groove 20.

[0059] During the actual operation of the plugging plate 10, water vapor will continuously impact the bottom surface of the plugging plate 10, causing vibration between the plugging plate 10 and the water flow groove 20. The vibration will cause displacement between the limiting plate 310 and the supporting plate 50. Furthermore, the rotation of the limiting plate 310 will cause the locking component 40 to become loose, affecting the use stability of the plugging mechanism.

[0060] Based on this, in the present invention, clamping grooves 311 are respectively formed on opposite end faces of the limiting plate 310 along its length extension direction. The clamping grooves 311 are used to be clamped on the groove walls at the ends of the supporting plate 50 in the water flow groove 20 to prevent the limiting plate 310 from rotating relative to the outer wall of the water flow groove 20.

[0061] In an embodiment, an installation hole 130 is formed in the middle of the plugging plate 10, and one end of the installation rod 320 is inserted into the installation hole 130 and extends outside the plugging plate 10.

[0062] The design of the installation hole 130 facilitates the connection between the installation rod 320 and the plugging plate 10. The installation hole 130 can be a light hole or a threaded hole, which is not limited herein.

[0063] In an embodiment, the locking component 40 includes a first connecting piece 410 and a second connecting piece 420. The first connecting piece 410 is in threaded cooperation with the installation rod 320, and the second connecting piece 420 is fixedly connected to the installation rod 320.

[0064] The locking component 40 can be used to limit the position of the plugging plate 10, avoiding the occurrence of the situation that the plugging plate 10 vibrates and moves downward due to the impact of water vapor on the plugging plate 10.

[0065] Furthermore, one end of the first connecting piece 410 abuts against the plugging plate 10, and the first connecting piece 410 and the second connecting piece 420 are arranged at intervals.

[0066] Specifically, the first connecting piece 410 is a locking round nut, and the second connecting piece 420 is a limit nut.

[0067] One end of the locking round nut can also be provided with a nut flange that abuts against the sealing plate 10, and the locking round nut is used to fix the sealing plate 10 to the water chute 20.

[0068] The second connecting member 420 and the mounting rod 320 can be connected by welding. The second connecting member 420 is to limit the downward movement distance of the first connecting member 410, thereby preventing the sealing plate 10 from completely disengaging from the water chute 20 when it moves downward.

[0069] In one embodiment, a pressure sensor 421 is provided on the end face of the second connecting member 420 facing the first connecting member 410; the distance between the first connecting member 410 and the second connecting member 420 is at least less than the depth of insertion of the sealing plate 10 into the water chute 20.

[0070] When the locking round nut itself becomes loose, the sealing plate 10 will move downward, finally reaching the position of the second connecting member 420 and exerting pressure on the pressure sensor 421. The staff can obtain the current position information of the sealing plate 10 according to the change in the value received by the pressure sensor 421, and then carry out maintenance in a timely manner.

[0071] In some other embodiments, the locking assembly 40 can also be only the first connecting member 410, which also falls within the protection scope of this solution. For details, reference can be made to Figure 3 ; and the preferred embodiment of the present invention is that the locking assembly 40 has both the first connecting member 410 and the second connecting member 420 at the same time. For example, reference can be made to Figure 4 .

[0072] In summary, for the water chute plugging mechanism of the steam generator of the present invention, a sealing plate 10 and a limiting plate 310 are provided at opposite ends of the water chute 20. The limiting plate 310, in cooperation with the mounting rod 320 and the locking assembly 40, can plug and install the sealing plate 10 at one port of the water chute 20. The installation is convenient and the required components are greatly reduced, which is beneficial to reducing the deposition of corrosion products and chemical substances.

[0073] Reference Figure 5 ; the present invention also provides a method for plugging the water chute of a steam generator, which is realized by using the above-mentioned water chute plugging mechanism of the steam generator. The plugging method includes:

[0074] S110: Rotate the length direction of the limiting plate to be consistent with the length direction of the water chute.

[0075] S120: Insert the limiting plate from one port of the water chute to the other port and rotate it 90 degrees so that the limiting plate straddles the other port of the water chute.

[0076] S130: Use the locking assembly to screw along the mounting rod to the end face of the sealing plate, and make the sealing plate plug one port of the water chute.

[0077] That is, first adjust the angle of the limit plate so that the limit plate can pass through the water chute from bottom to top. When the limit plate passes through the water chute to the upper port, rotate the limit plate so that the limit plate can straddle the upper port of the water chute. Then, use the locking component to limit the position of the plugging plate to complete the installation of the plugging plate.

[0078] This application uses specific terms to describe the embodiments of this application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0079] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention all fall within the protection scope defined by the claims of the present invention.

Claims

1. A sealing mechanism for the water trough of a steam generator, characterized in that Comprising: A plugging plate, one end of which is inserted into a water flow groove formed in a support plate, and the other end is plugged to one port of the water flow groove; A limiting mechanism, including a limiting plate and a mounting rod connected to the limiting plate. The limiting plate straddles the other port of the water flow groove. The mounting rod passes through the water flow groove and the plugging plate and extends to the outside of the plugging plate. One end of the mounting rod is connected to the plugging plate through a locking assembly; The locking assembly includes a first connecting member and a second connecting member. The first connecting member is in threaded cooperation with the mounting rod, and the second connecting member is fixedly connected to the mounting rod; One end of the first connecting member abuts against the plugging plate, and the first connecting member and the second connecting member are arranged at intervals; The first connecting member is a locking round nut, and the second connecting member is a limiting nut.

2. The steam generator water tank plugging mechanism according to claim 1, wherein, The plugging plate includes a plugging portion and a mounting portion. The size of the plugging portion corresponds to the size of the water flow groove, and the plugging portion is used for being inserted into the water flow groove; The mounting portion is mounted on one end face of the plugging portion. The size of the mounting portion is at least larger than the cross-sectional size of the water flow groove, and the mounting portion is used for straddling and plugging one port of the water flow groove.

3. The steam generator water trough plugging mechanism according to claim 2, characterized in that, The height of the plugging portion is less than the depth of the water flow groove.

4. The plugging mechanism for the water chute of the steam generator according to claim 1, characterized in that, The limiting plate has a length extending direction and a width extending direction; The dimension of the limiting plate in the length extending direction is larger than the width direction of the water flow groove, and the dimension of the limiting plate in the width extending direction is smaller than the width direction of the water flow groove.

5. The steam generator water tank plugging mechanism according to claim 1, characterized in that, At opposite ends of the limiting plate along its length extending direction, clamping grooves are respectively formed; The clamping grooves are used for being clamped on the groove walls at the ends of the water flow groove of the support plate to prevent the limiting plate from rotating relative to the outer wall of the water flow groove.

6. The steam generator water tank plugging mechanism according to claim 1, characterized in that, A mounting hole is formed in the middle of the plugging plate, and one end of the mounting rod is inserted into the mounting hole and extends to the outside of the plugging plate.

7. The water trough plugging mechanism of the steam generator according to claim 1, characterized in that A pressure sensor is provided on one end face of the second connecting member facing the first connecting member; The distance between the first connecting member and the second connecting member is at least less than the depth of insertion of the plugging plate into the water flow groove.

8. A method for plugging the water trough of a steam generator, which is realized by using the plugging mechanism for the water trough of the steam generator according to any one of claims 1-7, characterized in that, The plugging method includes: Rotating the length direction of the limiting plate to be consistent with the length direction of the water flow groove; Inserting the limiting plate from one port of the water flow groove to the other port and rotating it by 90 degrees so that the limiting plate straddles the other port of the water flow groove; Using the locking assembly to screw along the mounting rod to one end face of the plugging plate and making the plugging plate plug one port of the water flow groove.

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