Dynamic thermal compensation method for horizontal flange of steam turbine

Abstract

The invention provides a dynamic thermal compensation method for a horizontal flange of a steam turbine, and relates to the technical field of dynamic thermal compensation of flanges, a middle fixing sleeve, a stroke limiting telescopic air cylinder and a controller are included, the middle fixing sleeve is arranged outside the middle of a middle pipe section in a sleeving mode, and upper connecting plates are arranged on the upper side and the lower side of the middle fixing sleeve correspondingly; the middle of the upper connecting plate is sleeved with guide rods, a controller is installed in the middle of the guide rod on the lower side, multiple sets of stroke limiting telescopic air cylinders are installed on the front side and the rear side of the middle of the middle fixing sleeve correspondingly, pressing plates are fixed to the front ends of the stroke limiting telescopic air cylinders, and flanges are arranged at the left end and the right end of the middle pipe section correspondingly. Grooves are formed in the left portion and the right portion of the outer side face of the flange, the pressing plates are located in the grooves, and mounting grooves are formed in the front side and the rear side of the middle of the middle fixing sleeve. Thermal compensation positioning of the flange is accurate and reliable, thermal compensation is more efficient, convenient and practical, it is guaranteed that deformation of the flange is avoided, and connection of the flange is tighter and more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic thermal compensation of flanges, and in particular to a dynamic thermal compensation method for a horizontal flange of a steam turbine. Background Art

[0002] Thermal compensation is a measure taken to prevent damage to pipes caused by stress due to thermal expansion caused by rising temperatures. It also compensates for the thermal expansion of heating pipes, thereby reducing or eliminating the stress caused by thermal expansion and contraction. Its purpose is to prevent deformation or damage to heating pipes caused by thermal expansion or temperature stress when the heating pipes are heated, and to reduce stress on the pipe wall and the forces acting on valve components and support structures.

[0003] In the prior art (Announcement No. CN108050332A), a method for thermal compensation of a steam pipeline with thermal shock resistance and its design method are described in the specification. The method includes a full-annular compensation pipe, a reducer and a flange. The full-annular compensation pipe is spiral-shaped. The diameter of the full-annular compensation pipe is larger than the diameter of the corresponding steam pipeline. The inlet and outlet ends of the full-annular compensation pipe are transitionally connected to the steam pipeline via the reducer. The flanges are respectively provided at the ends of the reducer. The thermal compensation method is connected to the steam pipeline via the flange. However, the thermal compensation positioning of the flange in the prior art is not accurate and stable, the compensation is not in place, and the interface is prone to deformation and leakage. It is not more efficient, safe and practical. Summary of the Invention

[0004] In order to overcome the defects of the existing technology, a dynamic thermal compensation method for the horizontal flange of a turbine is provided to solve the problems in the existing technology that the thermal compensation positioning of the flange is not accurate and stable, the compensation is not in place, the interface deformation and leakage are prone to occur, and it is not efficient, safe and practical.

[0005] To achieve the above-mentioned purpose, a method for dynamic thermal compensation of a horizontal flange of a steam turbine is provided, comprising a middle fixed sleeve, a stroke-limiting telescopic cylinder and a controller, wherein the middle fixed sleeve is sleeved on the outside of the middle part of the middle pipe section, and upper connecting plates are provided on the upper and lower sides of the middle fixed sleeve, the middle part of the upper connecting plate is sleeved with a guide rod, and the middle part of the lower guide rod is installed with a controller, multiple groups of stroke-limiting telescopic cylinders are installed on the front and rear sides of the middle part of the middle fixed sleeve, and a pressure plate is fixed to the front end of the stroke-limiting telescopic cylinder; the guide rods provided on the upper and lower sides are used as straight guide rod structures, so that when the left and right ends of the middle pipe section undergo thermal expansion due to temperature increase, the stroke-limiting telescopic cylinders on the left and right parts of the middle fixed sleeve are used to pull back the expanded part of the flange for dynamic thermal compensation.

[0006] Furthermore, flanges are provided at both left and right ends of the middle pipe section, and grooves are provided on both left and right portions of the outer side surfaces of the flanges, and the pressure plates are located in the grooves.

[0007] Furthermore, mounting grooves are provided on both the front and rear sides of the middle portion of the middle fixing sleeve, and screw holes are provided on both the upper and lower portions of the middle fixing sleeve, and fastening bolts are installed in the screw holes.

[0008] Furthermore, a first set of holes is formed on the upper connecting plate, and the guide rod is arranged through the first set of holes, and the left and right parts of the guide rod are respectively placed in a set of second sets of holes.

[0009] Furthermore, the second set of holes is located in the middle of the side fixing plate, and the side fixing plate is fixed outside the flange.

[0010] Furthermore, a hanger is provided outside the controller, and the upper part of the hanger is sleeved outside the guide rod, and a control panel is provided on the front side of the controller.

[0011] The beneficial effects of the present invention are: 1. The grooves on both the front and rear sides of the outer side of the flange of the present invention are convenient for the pressing plate to be inserted and placed for use. The pressing plate and the groove are convenient for insertion and disassembly, which is more convenient and saves trouble.

[0012] 2. In the present invention, the guide rods arranged on the upper and lower sides are used as straight guide rod structures. When the left and right ends of the middle pipe section are thermally elongated due to temperature increase, the travel-limiting telescopic cylinders on the left and right parts of the middle fixed sleeve are used to pull back the elongated part of the flange for dynamic thermal compensation, which is more accurate, stable and practical.

[0013] 3. In the present invention, the stroke-limited telescopic cylinder is electrically connected to the controller, which facilitates the use of the controller to control the stroke-limited telescopic cylinder in real time to extend forward before thermal compensation until there is a certain distance between the pressure plate and the flange. When thermal compensation of the flange is required, the stroke-limited telescopic cylinder is pulled back when it contracts. At this time, the pressure plate is embedded back into the groove, driving the flange back to its original position, so as to achieve the purpose of thermal compensation, which is more efficient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of an embodiment of the present invention; Figure 2 It is a right side schematic diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of a middle fixing sleeve according to an embodiment of the present invention; Figure 4 Schematic diagram of a travel-limited telescopic cylinder according to an embodiment of the present invention.

[0015] In the figure: 1. Middle pipe section; 10. Flange; 11. Groove; 2. Middle fixing sleeve; 20. Mounting slot; 21. Screw hole; 22. Fastening bolt; 23. Upper connecting plate; 24. First set of holes; 25. Side fixing plate; 26. Second set of holes; 27. Guide rod; 3. Travel limit telescopic cylinder; 30. Pressure plate; 4. Controller; 40. Control panel; 41. Hanger. DETAILED DESCRIPTION

[0016] 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 with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Specific details such as specific system structures and technologies are provided to provide a more thorough understanding of the embodiments of the present invention. The described embodiments are part of the embodiments of the present disclosure, not all of them. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present disclosure.

[0017] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Figure 1 is a front view schematic diagram of an embodiment of the present invention, Figure 2 is a right side schematic diagram of an embodiment of the present invention, Figure 3 Schematic diagram of the fixing sleeve in the embodiment of the present invention and Figure 4 Schematic diagram of a travel-limited telescopic cylinder according to an embodiment of the present invention.

[0019] Reference Figures 1 to 4 As shown, the present invention provides a method for dynamic thermal compensation of a horizontal flange of a steam turbine, comprising a central fixing sleeve 2, a travel-limiting telescopic cylinder 3, and a controller 4. The central fixing sleeve 2 is mounted on the outside of the central portion of the central pipe section 1, and upper connecting plates 23 are provided on both the upper and lower sides of the central fixing sleeve 2. A guide rod 27 is mounted in the middle of the upper connecting plate 23, and the controller 4 is mounted in the middle of the lower guide rod 27. Multiple sets of travel-limiting telescopic cylinders 3 are mounted on both the front and rear sides of the central portion of the central fixing sleeve 2, and a pressure plate 30 is fixed to the front end of the travel-limiting telescopic cylinder 3. The guide rods 27 provided on the upper and lower sides serve as straight guide rod structures, so that when the left and right ends of the central pipe section 1 undergo thermal expansion due to temperature increase, the travel-limiting telescopic cylinders 3 on the left and right sides of the central fixing sleeve 2 retract the expanded portion of the flange, thereby performing dynamic thermal compensation.

[0020] In this embodiment, flanges 10 are provided at both left and right ends of the middle pipe section 1 , and grooves 11 are provided on both left and right outer sides of the flanges 10 , and the pressure plates 30 are located in the grooves 11 .

[0021] As a preferred embodiment, the grooves 11 provided on both the front and rear sides of the outer side of the flange 10 of the present invention facilitate the insertion and placement of the pressure plate 30. The pressure plate 30 and the grooves 11 are convenient for insertion and disassembly, which is more convenient and saves trouble.

[0022] In this embodiment, mounting grooves 20 are formed on both the front and rear sides of the middle portion of the middle fixing sleeve 2, and screw holes 21 are provided on both the upper and lower portions of the middle fixing sleeve 2, with fastening bolts 22 installed in the screw holes 21; a first set of holes 24 are formed on the upper connecting plate 23, and a guide rod 27 is provided through the first set of holes 24, and the left and right portions of the guide rod 27 are respectively inserted into a set of second sets of holes 26; the second set of holes 26 are located in the middle of the side fixing plate 25, and the side fixing plate 25 is fixed to the outside of the flange 10.

[0023] As a preferred embodiment, the present invention utilizes the guide rods 27 provided on the upper and lower sides as a straight guide rod structure, so that when the left and right ends of the middle pipe section 1 undergo thermal elongation due to temperature increase, the stroke-limiting telescopic cylinders 3 on the left and right parts of the middle fixed sleeve 2 are used to pull back the elongated part of the flange for dynamic thermal compensation, which is more accurate, stable and practical.

[0024] In this embodiment, a hanger 41 is provided outside the controller 4 , and the upper portion of the hanger 41 is sleeved outside the guide rod 27 , and a control panel 40 is provided on the front side of the controller 4 .

[0025] As a preferred embodiment, the stroke-limiting telescopic cylinder 3 and the controller 4 in the present invention are electrically connected, which facilitates the use of the controller 4 to control the stroke-limiting telescopic cylinder 3 in real time to extend forward before thermal compensation until there is a certain distance between the pressure plate 30 and the flange 10. When thermal compensation of the flange is required, the stroke-limiting telescopic cylinder 3 is pulled back when it contracts. At this time, the pressure plate 30 is embedded back into the groove 11, driving the flange 10 back to its original position, so as to achieve the purpose of thermal compensation, which is more efficient and practical.

[0026] The present invention can effectively solve the problems in the prior art that the thermal compensation positioning of the flange is not accurate and stable, the compensation is not in place, the interface deformation and leakage are prone to occur, and it is not efficient, safe and practical. The present invention can accurately and reliably position the thermal compensation of the flange, and the thermal compensation is more efficient, convenient and practical, so as to ensure that the flange does not deform and make its connection tighter and more reliable.

[0027] The above embodiments are used to illustrate the present invention rather than to limit the present invention. Any modifications and changes made to the present invention within the spirit of the present invention and the scope of the claims should be included in the scope of protection of the present invention.

Claims

1. A method for dynamic thermal compensation of a horizontal flange of a steam turbine, characterized by: The horizontal flange comprises a middle fixed sleeve (2), a stroke limiting telescopic cylinder (3) and a controller (4), wherein the middle fixed sleeve (2) is sleeved outside the middle of the middle pipe section (1), and upper connecting plates (23) are provided on both upper and lower sides of the middle fixed sleeve (2), a guide rod (27) is sleeved on the middle of the upper connecting plate (23), and a controller (4) is installed on the middle of the lower guide rod (27), and a plurality of groups of stroke limiting telescopic cylinders (3) are installed on both front and rear sides of the middle of the middle fixed sleeve (2), and a pressure plate (30) is fixed to the front end of the stroke limiting telescopic cylinder (3); the guide rods (27) provided on the upper and lower sides are used as straight guide rod structures, so that when the left and right ends of the middle pipe section (1) are thermally extended due to temperature rise, the stroke limiting telescopic cylinders (3) on the left and right sides of the middle fixed sleeve (2) are used to pull back the extended part of the flange to perform dynamic thermal compensation.

2. A method for dynamic thermal compensation of a horizontal flange of a steam turbine according to claim 1, characterized in that: Flanges (10) are provided at both left and right ends of the middle pipe section (1), and grooves (11) are provided on both left and right portions of the outer side surfaces of the flanges (10), and the pressure plates (30) are located in the grooves (11).

3. The method for dynamic thermal compensation of a horizontal flange of a steam turbine according to claim 1, characterized in that: The middle portion of the middle fixing sleeve (2) is provided with mounting grooves (20) on both the front and rear sides, and the upper and lower portions of the middle fixing sleeve (2) are provided with screw holes (21), and fastening bolts (22) are installed in the screw holes (21).

4. A method for dynamic thermal compensation of a horizontal flange of a steam turbine according to claim 1, 2 or 3, characterized in that: A first set of holes (24) is formed on the upper connecting plate (23), and the guide rod (27) is arranged through the first set of holes (24), and the left and right parts of the guide rod (27) are respectively placed in a set of second set of holes (26).

5. A method for dynamic thermal compensation of a horizontal flange of a steam turbine according to claim 4, characterized in that: The second set of holes (26) is located in the middle of the side fixing plate (25), and the side fixing plate (25) is fixed outside the flange (10).

6. A method for dynamic thermal compensation of a horizontal flange of a steam turbine according to claim 1, 2 or 3, characterized in that: A hanger (41) is provided outside the controller (4), and the upper portion of the hanger (41) is sleeved outside the guide rod (27), and a control panel (40) is provided on the front side of the controller (4).

Images