Sealing device at joint of internal cladding and steam of high-pressure heater
By using a seal consisting of the first annular member, the second annular member and the elastic member at the inner cladding and steam connection of the high-pressure heater, the problem of damage to the seal structure due to vibration and thermal expansion and contraction is solved, and efficient steam sealing is achieved, and the reliability and heat exchange efficiency of the equipment are improved.
Patent Information
- Application Number
- CN202422092762.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The sealing structure at the inner cladding and steam connection of the high-pressure heater is easily damaged due to equipment vibration and thermal expansion and contraction, resulting in steam leakage and affecting the heat exchange effect.
A seal consisting of a first annular member, a second annular member and an elastic member is adopted. The first annular member is sealed and welded with the cover. The second annular member is set on the steam connection pipe. The elastic force of the elastic member makes the second annular member tightly fit on the steam connection pipe to ensure the sealing effect.
It effectively avoids the steam connector or cladding rupture due to vibration and thermal expansion and contraction, ensures the sealing between the cladding and steam connector, avoids steam leakage, and improves the reliability and heat exchange efficiency of the equipment.
Smart Images
Figure CN222951599U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal power generation equipment, in particular to a sealing device for an inner cladding of a high-pressure heater and a steam pipe connection. Background Art
[0002] The interior of the high-pressure heating equipment is full of serpentine tubes. High-pressure and high-temperature steam is introduced into the high-pressure heater, and water flows through the serpentine tubes to realize the heat exchange process. When the steam pipe is extended into the shell covering the outside of the serpentine tube, the steam pipe needs to be sealed at the contact with the shell. Welding sealing is a simple way, but when the equipment is running, it will vibrate and expand and contract due to heat, which will make the welding between the shell and the steam pipe easy to crack, destroy the sealing structure, cause steam leakage, and affect the heat exchange effect. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a sealing device for the internal cladding of a high-pressure heater and a steam pipe connection, so as to solve the problem that the connection between the external cladding of a serpentine tube of a high-pressure heating device and the steam pipe connection is prone to cracking, resulting in poor sealing.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0005] A sealing device for the internal cladding and steam pipe of a high-pressure heater comprises a cladding, wherein a serpentine heat exchange tube is arranged in the inner cavity of the cladding, and the outer portion of the cladding is covered with a shell, a steam pipe is arranged on one side of the shell, one end of the steam pipe passes through the outside of the shell and communicates with the steam, and the other end of the steam pipe extends into the inner cavity of the cladding, and a sealing member is arranged at the outer circumference of the cladding near the steam pipe, the sealing member comprises a first annular member and a second annular member which are separately arranged, the first annular member is concentrically sealed and sleeved on the second annular member, the middle of the outer circumference of the first annular member is fixedly connected to the inner circumference of a circular hole of the cladding, the second annular member is sleeved on the outer circumference of the steam pipe, a compressed elastic member is arranged between the first annular member and the second annular member, and the elastic force of the elastic member is along the radial direction of the steam pipe, so that the inner circumference of the second annular member abuts against the outer circumference of the steam pipe.
[0006] As a preferred embodiment, the cross-section of the first annular member is a "T"-shaped annular body, including an outermost circle of a barrel ring, a plug plate extending radially toward the center of the circle from the middle of the inner circumference of the barrel ring, and an open groove cavity is radially arranged on the outer circumference of the second annular member, so that the cross-section of the second annular member is a "U"-shaped annular body, the annular plug plate of the first annular member extends into the annular groove cavity, and the two side surfaces of the inner circumference of the plug plate are arranged as smooth surfaces, and the smooth surfaces on both sides of the plug plate are in contact with the two opposite inner walls of the groove cavity, and the first grooves are respectively provided on both sides of the inner circumference of the barrel ring near the plug plate, and second grooves are respectively provided on the outer circumference of the second annular member relative to the first grooves, and the elastic member is a spring, and a plurality of compressed springs are distributed around the circumference and the two ends are respectively abutted on the first groove and the second groove.
[0007] As a preferred embodiment, the cross section of the inner circumferential surface of the second annular member is an arc surface convex toward the center of the circle, and the most protruding position in the middle of the arc surface contacts the outer circumference of the steam connecting pipe.
[0008] As a preferred embodiment, the second annular member includes an L-shaped ring plate, and a sealing side ring plate is welded to one side of the L-shaped ring plate.
[0009] As a preferred implementation scheme, the sealing member is made of steel.
[0010] The beneficial effects of the utility model are as follows: the steam pipe and the cladding are connected by a sealing member, the sealing member is composed of a first annular member, a second annular member and an elastic member, the first annular member and the second annular member nested together form a sealing structure, the first annular member and the cladding are sealed and welded together, the elastic member, i.e., a spring, causes the second annular member to press against the steam pipe, ensuring that steam will not leak between the cladding and the steam pipe, when the pipe and the cladding vibrate during equipment operation, the second annular member is tightly fitted to the steam pipe by utilizing the expansion and contraction force of the spring, avoiding the second annular member and the steam pipe from being too tightly fitted and causing the steam pipe or the cladding to rupture due to vibration, and also preventing steam from leaking due to a gap between the second annular member and the steam pipe caused by equipment vibration, and the structure is simple and reliable, easy to install, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 for Figure 1 A partial enlarged view of
[0014] Figure 3 This is a schematic diagram of the first annular member of the utility model;
[0015] Figure 4 This is a schematic diagram of the second annular member of the utility model;
[0016] Figure 5 This is a schematic diagram of an L-shaped ring plate of the utility model;
[0017] Figure 1~Figure 5 Explanation of the reference numerals in the accompanying drawings: 1. first annular member; 11. cylinder ring; 12. plug plate; 13. first sink groove; 14. smooth surface; 2. second annular member; 21. second sink groove; 22. L-shaped ring plate; 23. sealing side ring plate; 24. arc surface; 25. groove cavity; 3. elastic member; 4. sealing member; 5. cladding; 6. steam connecting pipe; 7. shell. DETAILED DESCRIPTION
[0018] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.
[0019] like Figure 1~Figure 5 The sealing device at the internal cladding and steam pipe of the high-pressure heater shown in the figure comprises a cladding 5, in the inner cavity of which a serpentine heat exchange tube is arranged, the outer portion of the cladding 5 is covered with a shell 7, a steam pipe 6 is arranged on one side of the shell 7, one end of the steam pipe 6 passes through the outside of the shell 7 and communicates with the steam, and the other end of the steam pipe 6 extends into the inner cavity of the cladding 5, a sealing member 4 is arranged at the outer circumference of the cladding 5 near the steam pipe 6, the sealing member 4 comprises a first annular member 1 and a second annular member 2 which are separately arranged, the first annular member 1 is concentrically sealed and sleeved on the second annular member 2, the middle of the outer circumference of the first annular member 1 is fixedly connected to the inner circumference of the circular hole of the cladding 5, the second annular member 2 is sleeved on the outer circumference of the steam pipe 6, a compressed elastic member 3 is arranged between the first annular member 1 and the second annular member 2, the elastic force of the elastic member 3 is along the radial direction of the steam pipe 6, so that the inner circumference of the second annular member 2 abuts against the outer circumference of the steam pipe 6.
[0020] Specifically, the first annular member 1 is welded in the circular hole of the cladding 5, and the first annular member 1 and the second annular member 2 which are sleeved together form a sealing structure. A compressed elastic member 3 is arranged between the first annular member 1 and the second annular member 2, so that the second annular member 2 is pressed against the steam pipe 6 to ensure the sealing between the cladding 5 and the steam pipe 6 and prevent steam leakage. When the equipment is running, the steam pipe 6 and the cladding 5 vibrate, and the overall structure will also expand and contract when subjected to high temperature, and the sizes of the first annular member 1, the second annular member 2 and the steam pipe 6 will change. This sealing structure uses the telescopic force of the elastic member 3 to fit the second annular member 2 tightly to the steam pipe 6, so that the second annular member 2 and the steam pipe 6 will not fit too tightly, resulting in rupture of the steam pipe 6 or the cladding 5 during vibration, nor will a gap be formed between the second annular member 2 and the steam pipe 6 due to equipment vibration to cause steam leakage.
[0021] like Figure 2 As shown, the cross-section of the first annular member 1 is a "T"-shaped annular body, including a cylindrical ring 11 of the outermost circle, a plug plate 12 is extended radially toward the center of the circle from the middle of the inner circumference of the cylindrical ring 11, and an open groove cavity 25 is radially arranged on the outer circumference of the second annular member 2, so that the cross-section of the second annular member 2 is a "U"-shaped annular body, the annular plug plate 12 of the first annular member 1 extends into the annular groove cavity 25, and the two side surfaces of the inner circumference of the plug plate 12 are arranged as smooth surfaces 14, and the smooth surfaces 14 on both sides of the plug plate 12 are in contact with the two opposite inner walls of the groove cavity 25, and the inner circumference of the cylindrical ring 11 is provided with first recessed grooves 13 on both sides close to the plug plate 12, and the outer circumference of the second annular member 2 is provided with second recessed grooves 21 at positions opposite to the first recessed grooves 13, and the elastic member 3 is a spring, and a plurality of compressed springs are distributed around the circumference and the two ends are respectively abutted on the first recessed groove 13 and the second recessed groove 21.
[0022] Among them, the "T"-shaped first ring member 1 extends into the groove cavity 25 of the "U"-shaped second ring member 2, and the plug plate 12 protruding from the middle of the first ring member 1 contacts the two side surfaces of the groove cavity 25 to form a sealed connection. The second ring member 2 is abutted against the steam pipe 6 by the force of the spring. The first ring member 1 and the second ring member 2 can move relative to each other with a margin of movement. They have the ability to adjust themselves when subjected to vibration and thermal expansion and contraction, and can also ensure the sealing effect.
[0023] like Figure 4 As shown, the cross section of the inner circumference of the second ring member 2 is an arc surface 24 convex toward the center of the circle, and the most protruding position in the middle of the arc surface 24 contacts the outer circumference of the steam pipe 6. The arc surface 24 makes the second ring member 2 in line contact with the steam pipe 6, and the contact is complete, reducing the pressure on the steam pipe 6.
[0024] like Figure 4 and Figure 5 As shown, the second annular member 2 comprises an L-shaped annular plate 22, and a sealing side annular plate 23 is welded on one side of the L-shaped annular plate 22. Such a structure is convenient for installation and cooperation with the first annular member 1.
[0025] The sealing member 4 is made of steel, and is made of the same material as the steam pipe 6 and the cladding 5, and can withstand high temperature and vibration, and the same thermal expansion and contraction deformation.
[0026] The utility model utilizes a rigid sealing structure to achieve high temperature resistance, and utilizes a spring arranged along the radial direction of the steam pipe 6 to absorb the internal stress changes caused by the thermal expansion and contraction of the steam pipe 6 and the second annular member 2, thereby effectively avoiding stress fatigue and cracking of the weld between the cladding 5 and the seal 4. The sealing is achieved by the second annular member 2 abutting against the steam pipe 6, and the free end of the steam pipe 6 is connected to the cladding 5 and then suspended, which can also effectively overcome the influence of the axial thermal expansion and contraction of the steam pipe 6 on the sealing structure. The change in the axial length of the steam pipe 6 caused by thermal expansion and contraction will release its internal stress in the form of relative sliding at the second annular member 2, and therefore will not affect the weld between the seal 4 and the cladding 5. Finally, the reliable sealing of the seal 4 and the steam pipe 6 is ensured, and the problem of cracking caused by repeated internal stress in the weld between the seal 4 and the cladding is avoided.
[0027] The working process of the utility model is as follows:
[0028] As shown in Figures 1-5, first, the L-shaped ring plate 22 is embedded in the inner circumference of the first ring member 1, and the inner circumference of the sealing side ring plate 23 is welded to the side of the L-shaped ring plate 22 to form a nested second ring member 2 and the first ring member 1. Then, the middle of the outer circumference of the first ring member 1 is sealed and welded to the cladding 5 at the circular hole of the steam pipe 6. Finally, a spring is installed between the second ring member 2 and the first ring member 1 so that the inner circumference of the second ring member 2 abuts against the steam pipe 6.
[0029] The above embodiments are only illustrative of the principles and effects of the invention of the utility model, as well as some embodiments of its application, and are not intended to limit the invention of the utility model. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.
Claims
1. A sealing device for the internal cladding of a high-pressure heater and a steam pipe, characterized in that: The invention comprises a cladding (5), wherein a serpentine heat exchange tube is arranged in the inner cavity of the cladding (5), the outer portion of the cladding (5) is covered with a shell (7), a steam pipe (6) is arranged on one side of the shell (7), one end of the steam pipe (6) passes through the outer portion of the shell (7) to communicate with the steam, and the other end of the steam pipe (6) extends into the inner cavity of the cladding (5), and a sealing member (4) is arranged at the outer circumference of the cladding (5) near the steam pipe (6), and the sealing member (4) comprises a first annular member (1) and a second annular member (2) which are arranged separately. The first annular member (1) is coaxially sealed and sleeved on the second annular member (2); the middle of the outer circumference of the first annular member (1) is fixedly connected to the inner circumference of the circular hole of the cladding (5); the second annular member (2) is sleeved on the outer circumference of the steam pipe (6); a compressed elastic member (3) is arranged between the first annular member (1) and the second annular member (2); the elastic force of the elastic member (3) is along the radial direction of the steam pipe (6), so that the inner circumference of the second annular member (2) abuts against the outer circumference of the steam pipe (6).
2. The sealing device for the internal cladding of the high-pressure heater and the steam pipe according to claim 1, characterized in that: The first annular member (1) has a "T"-shaped cross section and includes a cylindrical ring (11) at the outermost circle. A plug plate (12) extends radially toward the center of the inner circumference of the cylindrical ring (11). An open groove cavity (25) is radially arranged on the outer circumference of the second annular member (2), so that the cross section of the second annular member (2) is a "U"-shaped annular member. The annular plug plate (12) of the first annular member (1) extends into the annular groove cavity (25). The inner circumference of the plug plate (12) is provided on both sides. The smooth surface (14) is provided on both sides of the plug plate (12), and the smooth surfaces (14) on both sides of the plug plate (12) are in contact with two opposite inner side walls of the groove cavity (25). The inner circumference of the cylinder ring (11) is provided with first recessed grooves (13) on both sides close to the plug plate (12). The outer circumference of the second annular member (2) is provided with second recessed grooves (21) at positions opposite to the first recessed grooves (13). The elastic member (3) is a spring. A plurality of compressed springs are distributed around the circumference and the two ends of the springs are respectively abutted against the first recessed groove (13) and the second recessed groove (21).
3. The sealing device for the internal cladding of the high-pressure heater and the steam pipe according to claim 1, characterized in that: The cross section of the inner circumferential surface of the second annular member (2) is an arc surface (24) convex toward the center of the circle, and the most protruding position in the middle of the arc surface (24) contacts the outer circumference of the steam connecting pipe (6).
4. The sealing device for the internal cladding of the high-pressure heater and the steam pipe according to claim 1, characterized in that: The second annular member (2) comprises an L-shaped annular plate (22), and a sealing side annular plate (23) is welded to one side of the L-shaped annular plate (22).
5. The sealing device for the internal cladding of the high-pressure heater and the steam pipe according to claim 1, characterized in that: The sealing member (4) is made of steel.