Steam generator support plate water channel plugging mechanism and plugging method

Abstract

The present invention provides a sealing mechanism and a sealing method for the water flow groove of the steam generator support plate. The sealing mechanism includes a first plug plate, a second plug plate, a connecting rod, and a locking mechanism; one end of the connecting rod penetrates through the second plug plate and extends to the first plug plate and is rotatably matched with the first plug plate. The second plug plate is slidably matched along the axial direction of the connecting rod. The locking mechanism is arranged on the side of the second plug plate facing away from the first plug plate and is installed on the connecting rod. One end of the locking mechanism is used to elastically press the second plug plate. For the sealing mechanism of the water flow groove of the steam generator support plate of the present invention, under the drive of the locking mechanism, the first plug plate can seal the water flow groove, achieving the effect of reducing the flow rate near the water flow groove and suppressing the flow-induced vibration phenomenon near the water flow groove caused by excessive flow rate, thereby solving the problem of wear of the heat transfer tubes due to the increase in the flow rate near the water flow groove of the in-service steam generator.

Description

Technical Field

[0001] The invention relates to the technical field of steam generators, and in particular to a steam generator support plate water flow channel blocking mechanism and a blocking method. 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] In order to improve the problem of uneven flow field distribution of the heat transfer tube bundle of the steam generator, a square groove can be set on the top support plate as a support plate water flow groove, which also serves as an in-service inspection channel.

[0004] However, since the flow resistance in the pipe gallery area is smaller than that in the tube-through area, the local flow velocity of the fluid on the secondary side of the steam generator is relatively large in the pipe gallery area, especially in the square trough area where the flow velocity increases significantly. Under certain operating conditions, the flow velocity in the support plate flow trough area is too high, which stimulates the vibration of the nearby tube bundle, thereby causing wear of the tube bundle and eventually leading to damage and blockage of the heat transfer tube.

[0005] Based on this, the inventor of the present application proposes a steam generator support plate water flow channel plugging mechanism and plugging method, 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 in the prior art that the local flow velocity at the water flow groove of the steam generator support plate is too large, resulting in reduced safety and reliability of the steam generator, and to provide a steam generator support plate water flow groove sealing mechanism and sealing method.

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

[0008] The present invention provides a steam generator support plate water flow channel blocking mechanism, which is characterized by comprising:

[0009] A first blocking plate, a second blocking plate, a connecting rod and a locking mechanism;

[0010] One end of the connecting rod is passed through the second blocking plate and extends to the first blocking plate and is rotatably matched with the first blocking plate. The second blocking plate is axially slidably matched with the connecting rod. The locking mechanism is arranged on the side of the second blocking plate away from the first blocking plate and is installed on the connecting rod. One end of the locking mechanism is used to elastically press the second blocking plate; wherein,

[0011] The first baffle plate has a first state and a second state when rotatably engaged with the connecting rod. In the first state, the first baffle plate rotates axially towards the connecting rod and is adapted to pass through the water chute of the support plate, so that the first baffle plate and the second baffle plate are respectively located on opposite sides of the water chute of the support plate; in the second state, the first baffle plate rotates to a horizontal state and is used to cooperate with the second baffle plate to block the water chute of the support plate together.

[0012] According to an embodiment of the present invention, the first baffle plate has an embedded part and a limiting part. The embedded part is embedded in the water chute of the support plate, and the circumferential dimension of the embedded part corresponds to the cross-sectional dimension of the water chute of the support plate;

[0013] The circumferential dimension of the limiting part is larger than the circumferential dimension of the cross-section of the water chute of the support plate.

[0014] According to an embodiment of the present invention, the length of the limiting part is greater than the length of the water chute of the support plate, and the width of the limiting part is less than the length of the water chute of the support plate;

[0015] The sum of the thickness of the limiting part and the radial dimension of the connecting rod is less than the width of the water chute of the support plate, so that in the first state, the first baffle plate shrinks to the side of the connecting rod and is adapted to pass through the water chute of the support plate.

[0016] According to an embodiment of the present invention, the first baffle plate and the connecting rod are detachably connected.

[0017] According to an embodiment of the present invention, the first baffle plate and the connecting rod are detachably connected by rotation through a pin shaft.

[0018] According to an embodiment of the present invention, the projection of the second baffle plate on a plane along the axial direction of the connecting rod and the projection of the water chute of the support plate on the plane at least partially overlap.

[0019] According to an embodiment of the present invention, the locking mechanism includes a locking nut and a compression spring;

[0020] The locking nut is sleeved outside the connecting rod and is in threaded cooperation with the connecting rod;

[0021] A stop block is further provided on the connecting rod. The compression spring is sleeved on the connecting rod and one end thereof abuts against the stop block, and the other end elastically abuts against the locking nut.

[0022] According to an embodiment of the present invention, in the first state and the second state, the compression spring is in an elastically compressed state.

[0023] According to an embodiment of the present invention, the first baffle is made of a high-temperature resistant material.

[0024] The present invention also provides a method for sealing the water chute of the steam generator support plate, characterized in that the above-mentioned sealing mechanism of the water chute of the steam generator support plate is adopted, and the sealing method includes:

[0025] Rotate the first baffle axially towards the connecting rod so that the first baffle penetrates through the water chute of the support plate and is respectively arranged at opposite ends of the water chute of the support plate with the second baffle;

[0026] Rotate the length extension direction of the first baffle to be consistent with the length extension direction of the water chute of the support plate and seal one port of the water chute of the support plate;

[0027] Screw in the locking nut until the second baffle is pressed against the other port of the water chute of the support plate.

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

[0029] For the sealing mechanism of the water chute of the steam generator support plate of the present invention, under the drive of the locking mechanism, the first baffle and the second baffle can seal the water chute of the support plate, which has the effect of reducing the flow velocity near the water chute of the support plate, suppressing the flow-induced vibration phenomenon near the water chute of the support plate caused by excessive flow velocity, and thus solving the problem of wear of the heat transfer tubes due to the increase in the flow velocity near the water chute of the support plate in the in-service steam generator. Compared with the existing sealing mechanisms, the sealing mechanism of the present invention has a simpler structure and increased sealing reliability. BRIEF 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 in conjunction with the drawings and embodiments, wherein:

[0031] Figure 1 is a schematic diagram of the first state of the sealing mechanism of the water chute of the steam generator support plate of the present invention;

[0032] Figure 2 is a schematic diagram of the second state of the sealing mechanism of the water chute of the steam generator support plate of the present invention;

[0033] Figure 3 is a schematic diagram of the structure of the first embodiment of the sealing mechanism of the water chute of the steam generator support plate of the present invention;

[0034] Figure 4 is a schematic diagram of the structure of the second embodiment of the sealing mechanism of the water chute of the steam generator support plate of the present invention;

[0035] Figure 5 is a flowchart of the method for sealing the water chute of the steam generator support plate of the present invention.

[0036] 10. first blocking plate; 110. embedded portion; 120. limiting portion; 130. pin shaft;

[0037] 20. Second blocking board;

[0038] 30. Connecting rod; 310. Stop block;

[0039] 40. locking mechanism; 410. locking nut; 420. compression spring;

[0040] 50. Support plate; 510. Support plate water flow channel. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all 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 specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0043] Reference Figures 1 to 4 The present invention proposes a steam generator support plate water flow channel blocking mechanism, comprising: a first blocking plate 10, a second blocking plate 20, a connecting rod 30 and a locking mechanism 40; one end of the connecting rod 30 is passed through the second blocking plate 20 and extends to the first blocking plate 10 and rotates with the first blocking plate 10, the second blocking plate 20 slides axially along the connecting rod 30, the locking mechanism 40 is arranged on the side of the second blocking plate 20 away from the first blocking plate 10 and is installed on the connecting rod 30, and one end of the locking mechanism 40 is used to elastically press the second blocking plate 20.

[0044] The first blocking plate 10 and the connecting rod 30 have a first state and a second state when they are rotated together. In the first state (refer to Figure 1 ), the first blocking plate 10 is axially rotated toward the connecting rod 30 and is suitable for being inserted into the supporting plate water flow channel 510, so that the first blocking plate 10 and the second blocking plate 20 are respectively arranged on opposite sides of the supporting plate water flow channel 510; in the second state (refer to Figure 2 ), the first blocking plate 10 is turned to a horizontal state and is used to cooperate with the second blocking plate 20 to block the support plate water flow channel 510.

[0045] It should be noted that the plugging mechanism includes an installation state and a plugging state. The installation state corresponds to the first state, and the plugging state corresponds to the second state. In the installation state, the first plugging plate 10 needs to extend from below the water flow groove 510 of the support plate to above the water flow groove 510 of the support plate so that the first plugging plate 10 and the second plugging plate 20 are respectively arranged on opposite sides of the water flow groove 510 of the support plate. When the first plugging plate 10 reaches the upper port of the water flow groove 510 of the support plate, it can enter the plugging state.

[0046] In the plugging state, at this time, the first plugging plate 10 plugs to the upper port of the water flow groove 510 of the support plate, preventing the water vapor below the water flow groove 510 of the support plate from passing through the water flow groove 510 of the support plate. The second plugging plate 20 is pressed against the second port of the water flow groove 510 of the support plate under the drive of the locking mechanism 40.

[0047] With this setting, under the combined action of the first plugging plate 10 and the second plugging plate 20, the plugging mechanism is installed at the water flow groove 510 of the support plate, achieving the effect of reducing the flow rate near the water flow groove 510 of the support plate, and can also inhibit the flow-induced vibration phenomenon near the water flow groove 510 of the support plate caused by excessive flow rate, thus solving the problem of wear of the heat transfer tubes due to the increased flow rate near the water flow groove 510 of the in-service steam generator.

[0048] Please refer to Figures 2 to 4 , in an embodiment, the first plugging plate 10 has an embedded part 110 and a limiting part 120. The embedded part 110 is embedded in the water flow groove 510 of the support plate, and the circumferential dimension of the embedded part 110 corresponds to the cross-sectional dimension of the water flow groove 510 of the support plate; the circumferential dimension of the limiting part 120 is larger than the circumferential cross-sectional dimension of the water flow groove 510 of the support plate.

[0049] That is to say, the embedded part 110 is used to be embedded in the water flow groove 510 of the support plate to plug the water flow groove 510 of the support plate, and the limiting part 120 is used to cover one port of the water flow groove 510 of the support plate, and together with the embedded part 110, it plugs the water flow groove 510 of the support plate.

[0050] In an embodiment, the water flow groove 510 of the support plate is a square groove, and the corresponding limiting part 120 and the embedded part 110 are both square structures. Thus, after the embedded part 110 is embedded in the water flow groove 510 of the support plate, the rotation of the embedded part 110 itself can be avoided, improving the plugging stability between the first plugging plate 10 and the water flow groove 510 of the support plate.

[0051] The size of the limiting part 120 is larger than that of the embedded part 110 and the water chute 510 of the support plate, which is used to prevent the first plug plate 10 from moving axially along the water chute 510 of the support plate. Under the clamping action of the limiting part 120, the first plug plate 10 is clamped at one port of the water chute 510 of the support plate in the second state, and the cooperation stability between the first plug plate 10 and the water chute 510 of the support plate is improved by cooperating with the embedded part 110.

[0052] Furthermore, the length of the limiting part 120 is greater than the length of the water chute 510 of the support plate, and the width of the limiting part 120 is less than the length of the water chute 510 of the support plate. The sum of the thickness of the limiting part 120 and the radial dimension of the connecting rod 30 is less than the width of the water chute 510 of the support plate, so that in the first state, the first plug plate 10 shrinks to the side of the connecting rod 30 and is used to pass through the water chute 510 of the support plate.

[0053] That is to say, in the first state, the first plug plate 10 and the connecting rod 30 can pass through the water chute 510 of the support plate, so that the first plug plate 10 and the second plug plate 20 are respectively arranged on opposite sides of the water chute 510 of the support plate.

[0054] In the second state, the first plug plate 10 rotates 90 degrees compared with the first state. At this time, the length extension direction of the first plug plate 10 is consistent with the length extension direction of the water chute 510 of the support plate. Under the pulling of the connecting rod 30, the blocking part of the first plug plate 10 can block the water chute 510 of the support plate.

[0055] In one embodiment, the first plug plate 10 and the connecting rod 30 are detachably connected.

[0056] Specifically, the first plug plate 10 and the connecting rod 30 are detachably connected by rotating through a pin shaft 130.

[0057] That is to say, a groove can be opened at the end of the connecting rod 30 so that the pin shaft 130 passes through the groove. A fitting plate is provided on the side of the first plug plate 10 facing the connecting rod 30. An opening is formed on the fitting plate and can be sleeved outside the pin shaft 130 and rotatably cooperate with the pin shaft 130.

[0058] Refer to Figure 1 and Figure 3 , in the initial state, under the action of its own gravity, one end of the first plug plate 10 will rotate axially towards the connecting rod 30. At this time, the included angle between the first plug plate 10 and the connecting rod 30 is set, and the overall size is small, so that it can pass through the water chute 510 of the support plate. When the first plug plate 10 reaches the upper port of the water chute 510 of the support plate, it rotates 90 degrees to the Figure 2 and Figure 4 state. Under the pulling of the connecting rod 30, the first plug plate 10 rotates relative to the connecting rod 30, so that the first plug plate 10 can cover the water chute 510 of the support plate and block it.

[0059] In one embodiment, the projection of the second baffle 20 onto a plane along the axial direction of the connecting rod 30 at least partially overlaps with the projection generated by the water chute 510 of the support plate onto the plane.

[0060] That is to say, the second baffle 20 mainly functions as a limit. With the cooperation of the locking mechanism 40, the position of the first baffle 10 is limited to prevent relative displacement between the first baffle 10 itself and the water chute 510 of the support plate.

[0061] Specifically, the locking mechanism 40 includes a locking nut 410 and a compression spring 420; the locking nut 410 is sleeved outside the connecting rod 30 and is in threaded cooperation with the connecting rod 30. A stop block 310 is also provided on the connecting rod 30. The compression spring 420 is sleeved on the connecting rod 30 and one end abuts against the stop block 310, and the other end elastically abuts against the locking nut 410.

[0062] It should be noted that in the second state, at this time, the connecting rod 30 pulls the first baffle 10 to cover the water chute 510 of the support plate, and then the locking nut 410 is rotated until the second baffle 20 abuts against the lower end of the support plate 50. At this time, the first baffle 10 and the second baffle 20 are respectively located on opposite sides of the support plate 50 and respectively form an abutment with the support plate 50. At the same time, the compression spring 420 is in a continuously compressed state, so that a passive stopping effect can be achieved.

[0063] For example, when the first baffle 10 moves up or down due to the vibration of the support plate 50 or the heat pipe, the gap between the second baffle 20 and the support plate 50 will become larger. As a result, the locking nut 410 will face the risk of loosening. The compression spring 420 provided in the present invention can provide an elastic force to the locking nut 410. When the locking nut 410 has a downward movement trend, the compression spring 420 will provide an elastic force to press against the locking nut 410 to prevent the locking nut 410 from moving downward, offsetting the vibration force of the support plate 50 or the heat pipe, and passively adjusting the position of the locking nut 410 to ensure that the second baffle 20 always presses against the lower surface of the support plate 50, improving the sealing stability of the first baffle 10.

[0064] In one embodiment, the first baffle 10 is made of a high-temperature resistant material.

[0065] With this setting, the sealing stability between the first baffle 10 and the water chute 510 of the support plate can be improved.

[0066] For example, the first baffle 10 and the water chute 510 of the support plate can be in clearance fit, so that the sealing effect of the first baffle 10 on the water chute 510 of the support plate can be improved.

[0067] In summary, for the flow channel plugging mechanism of the support plate of the steam generator of the present invention, under the drive of the locking mechanism 40, the first plugging plate 10 and the second plugging plate 20 can plug the flow channel 510 of the support plate, reducing the flow velocity near the flow channel 510 of the support plate, suppressing the flow-induced vibration phenomenon near the flow channel 510 of the support plate caused by excessive flow velocity, and thus solving the problem of wear of the heat transfer tubes due to the increase in the flow velocity near the flow channel 510 of the in-service steam generator. Compared with the existing plugging mechanisms, the plugging mechanism of the present invention has a simpler structure and increased plugging reliability.

[0068] Please refer to Figure 5 , the present invention also provides a method for plugging the flow channel of the support plate of a steam generator, which is realized by using the above-mentioned flow channel plugging mechanism of the support plate of the steam generator. The plugging method includes:

[0069] S110. Rotate the first plugging plate axially towards the connecting rod so that the first plugging plate passes through the flow channel of the support plate and is disposed at opposite ends of the flow channel of the support plate with the second plugging plate.

[0070] S120. Rotate the length extension direction of the first plugging plate to be consistent with the length extension direction of the flow channel of the support plate and plug one port of the flow channel of the support plate.

[0071] S130. Screw in the locking nut until the second plugging plate presses on the other port of the flow channel of the support plate.

[0072] That is, the plugging mechanism is installed in a single direction. In the installed state, the first plugging plate is rotated by gravity or manually towards the side of the connecting rod so that the first plugging plate can horizontally pass through the flow channel of the support plate. After passing through the flow channel of the support plate, the first plugging plate is rotated to the plugging state. Under the pulling of the connecting rod, the first plugging plate plugs the flow channel of the support plate. At this time, the locking nut is adjusted to move upward so that the second plugging plate presses against the lower end surface of the support plate, cooperating with the first plugging plate to complete the plugging of the flow channel of the support plate.

[0073] When disassembling, first loosen the locking nut so that the first plugging plate can move upward a certain distance, then rotate itself 90 degrees first under the rotation of the connecting rod and at the same time rotate towards the direction of the connecting rod. At this time, pull the connecting rod to move the first plugging plate out of the flow channel of the support plate.

[0074] This application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one 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.

[0075] Although the present invention is disclosed above with preferred embodiments, it is not intended 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 modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A plugging mechanism for the water chute of the support plate of a steam generator, characterized in that, include: A first blocking plate, a second blocking plate, a connecting rod and a locking mechanism; One end of the connecting rod is passed through the second blocking plate and extends to the first blocking plate and is rotatably matched with the first blocking plate. The second blocking plate is axially slidably matched with the connecting rod. The locking mechanism is arranged on the side of the second blocking plate away from the first blocking plate and is installed on the connecting rod. One end of the locking mechanism is used to elastically press the second blocking plate; wherein, The first blocking plate has a first state and a second state when it is rotated in cooperation with the connecting rod. In the first state, the first blocking plate rotates toward the axial direction of the connecting rod and is suitable for being inserted into the support plate water flow channel, so that the first blocking plate and the second blocking plate are arranged on opposite sides of the support plate water flow channel; in the second state, the first blocking plate rotates to a horizontal state and is used to cooperate with the second blocking plate to block the support plate water flow channel; The first blocking plate has an embedded portion and a limiting portion, the embedded portion is embedded in the support plate water flow channel and the circumferential dimension of the embedded portion corresponds to the cross-sectional dimension of the support plate water flow channel; The circumferential dimension of the limiting portion is greater than the circumferential dimension of the cross section of the water flow channel of the support plate; The locking mechanism comprises a locking nut and a compression spring; The locking nut is sleeved on the outside of the connecting rod and matched with the thread of the connecting rod; A stop block is also provided on the connecting rod. The compression spring is sleeved on the connecting rod and abuts against the stop block at one end and elastically abuts against the locking nut at the other end.

2. The water chute plugging mechanism for the steam generator support plate according to claim 1, characterized in that The length of the limiting portion is greater than the length of the supporting plate water flow channel, and the width of the limiting portion is less than the length of the supporting plate water flow channel; The sum of the thickness of the limiting portion and the radial dimension of the connecting rod is smaller than the width of the supporting plate water flow channel, so that in the first state, the first blocking plate is retracted to the connecting rod side and is used to penetrate the supporting plate water flow channel.

3. The water chute plugging mechanism for the steam generator support plate according to claim 1, wherein The first blocking plate and the connecting rod are detachably connected.

4. The water chute plugging mechanism for the steam generator support plate according to claim 3, characterized in that, The first blocking plate is detachably connected to the connecting rod by rotating through a pin.

5. The steam generator support plate water channel plugging mechanism according to claim 1, characterized in that, The projection of the second blocking plate along the axial direction of the connecting rod to a plane at least partially overlaps with the projection of the supporting plate water flow channel to the plane.

6. The steam generator support plate water chute plugging mechanism according to claim 1, characterized in that, In both the first state and the second state, the compression spring is in an elastic compression state.

7. The water chute plugging mechanism for the steam generator support plate according to claim 1, characterized in that The first blocking plate is made of high temperature resistant material.

8. A method for plugging the water chute of a steam generator support plate is realized by using the water chute plugging mechanism of the steam generator support plate described in any one of claims 1-7, characterized in that, The blocking method comprises: The first blocking plate is rotated toward the axial direction of the connecting rod, so that the first blocking plate is inserted into the support plate water flow channel and is disposed at opposite ends of the support plate water flow channel with the second blocking plate; Rotate the first blocking plate to extend in a direction that is consistent with the direction of the supporting plate water flow channel and block one end of the supporting plate water flow channel; The locking nut is screwed in until the second blocking plate is pressed against another port of the support plate water flow channel.

Images