Heat preservation structure for steam seal at end part of high and medium pressure cylinder of steam turbine

Abstract

The utility model discloses a steam turbine high-medium pressure cylinder end part steam seal heat preservation structure, which relates to the technical field of heat preservation structures, and comprises a high-medium pressure cylinder, a low pressure cylinder arranged on one side and a steam turbine shaft arranged in the middle, and mounting grooves capable of sealing the steam turbine shaft are arranged on two sides in the high-medium pressure cylinder and the low pressure cylinder. The shaft sealing blocks are used for sealing steam turbine shafts exposed at the middle ends of the high-medium-pressure cylinder and the low-pressure cylinder on the two sides, then when huge heat energy is generated in the high-medium-pressure cylinder, the draught fan in the guide block is used for guiding, hot air on one side reaches the interior of the low-pressure cylinder through the transfer pipe, finally, the temperature on the two sides is averaged, and the heat efficiency is improved. And the steam turbine shaft at the middle end can be sealed through the soft porcelain heat preservation plate, the working efficiency of the steam turbine shaft can be greatly improved, the situation that most structures cannot average the temperatures of the two ends is avoided, the temperatures of the steam turbine shafts on the two sides in the steam turbine are consistent, the working efficiency of the steam turbine is improved, and the damage rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal insulation structures, in particular to a steam seal thermal insulation structure at the end of a high and medium pressure cylinder of a steam turbine. Background Art

[0002] Industrial steam turbine is a prime mover commonly used in industrial production. It is often used to drive large mechanical equipment such as fans, feed water pumps, compressors, etc. In order to improve the efficiency of steam turbine, the operating parameters of steam turbine, such as the pressure and temperature of steam inlet, are getting higher and higher. In order to ensure that the steam turbine can still operate reliably under high parameters, it is necessary to cool the inner cylinder and other components that work under high temperature conditions for a long time.

[0003] After searching, the applicant found that a Chinese patent disclosed "An adaptive high-pressure inner cylinder of a supercritical parameter steam turbine", and its publication number is "CN216342348U", which includes a rotor and an inner cylinder, wherein the inner cylinder is arranged around the rotor, and a steam seal structure is provided between the rotor and the inner cylinder, and a heat insulation plate is provided on the outer surface of the inner cylinder, and a gap is left between the heat insulation plate and the outer surface of the inner cylinder, and the heat insulation plate is located at the end of the inner cylinder, and the end is covered by the heat insulation plate, and an opening is provided in the center of the heat insulation plate, and the rotor passes through the opening, and the heat insulation plate and the inner cylinder are connected by welding or bolts, and the area of ​​the heat insulation plate is larger than the cross-sectional area of ​​the end of the inner cylinder. The utility model can solve the problem of deformation of the inner cylinder of the steam turbine due to large temperature difference, is easy to implement, and requires fewer additional components;

[0004] However, the heat energy generated between the high-pressure and low-pressure cylinders inside the existing steam turbine is uneven. The heat generated at the top of the high-pressure and low-pressure cylinders is one or even several times that of the low-pressure cylinder. Therefore, when the temperature difference is uneven, it will cause damage to the turbine shaft, making maintenance work cumbersome. Utility Model Content

[0005] The purpose of the utility model is to provide a steam seal insulation structure at the end of the high and medium pressure cylinders of a steam turbine, so as to solve the problem proposed in the above background technology that the heat energy generated between the high and medium pressure cylinders and the low pressure cylinder inside the existing steam turbine is uneven, and the heat generated at the top of the high and medium pressure cylinders is one or even several times that of the low pressure cylinder, so under the condition of uneven temperature difference, it will cause damage to the turbine shaft, making the maintenance work cumbersome.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam seal insulation structure for the ends of high and medium pressure cylinders of a steam turbine, comprising a high and medium pressure cylinder and a low pressure cylinder arranged on one side and a steam turbine shaft arranged in the middle, both sides of the interior of the high and medium pressure cylinder and the low pressure cylinder are provided with mounting grooves capable of sealing the steam turbine shaft, the interiors of the two mounting grooves are jointly provided with a shaft seal block capable of utilizing internal insulation material to produce a heat insulation effect, and the top surface of the shaft seal block is provided with a guide block capable of guiding heat energy on one side to make the internal temperature consistent.

[0007] Preferably, the two installation grooves are both arranged inside the high- and medium-pressure cylinder and the low-pressure cylinder, and the high- and medium-pressure cylinder and the low-pressure cylinder are both provided with limiting round blocks on both sides of the installation grooves.

[0008] Preferably, the two sides of the shaft sealing block are fixedly connected to the inside of the two installation grooves, and the two sides of the shaft sealing block located on the inner surface of the high-pressure cylinder and the low-pressure cylinder are fixedly connected to the opposite sides of the limiting circular blocks on one side.

[0009] Preferably, a fixing groove is provided inside the shaft sealing block, a transfer pipe is provided inside the fixing groove, and both ends of the transfer pipe extend to the inside of the high- and medium-pressure cylinders and the low-pressure cylinder respectively.

[0010] Preferably, a guide groove is provided inside the shaft sealing block at the top end of the transfer tube, a guide tube is provided inside the guide groove, and a guide cavity is provided inside the guide tube.

[0011] Preferably, soft porcelain insulation plates are provided on the inner wall of the shaft seal block on both sides of the high and medium pressure cylinders and the low pressure cylinder.

[0012] Preferably, the material used for the soft porcelain insulation board is expanded polystyrene board, also known as EPS board.

[0013] Preferably, the guide block is fixedly connected to the top surface of the shaft sealing block, a working cavity is provided inside the guide block, a fan is fixedly connected to both sides of the inner wall of the working cavity, a connecting pipe is fixedly connected to the output end of the fan, and the bottom end of the connecting pipe passes through the interior of the shaft sealing block and extends to the interior.

[0014] The technical effects and advantages of the utility model are as follows: the utility model utilizes a shaft sealing block to seal the high and medium pressure cylinders on both sides and the exposed turbine shaft at the middle end of the low pressure cylinder. Subsequently, when a huge high temperature is generated inside the high and medium pressure cylinders, the fan inside the guide block is used to guide the heat on one side to reach the inside of the low pressure cylinder through the transfer pipe, and finally the temperatures on both sides are averaged. The soft porcelain insulation board is used to seal the turbine shaft at the middle end, so that its working efficiency can be greatly improved, avoiding the problem that most structures cannot average the temperatures at both ends, so that the temperatures of the turbine shafts on both sides inside the turbine are consistent, thereby improving the working efficiency of the turbine and reducing the damage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the overall front cross-sectional structure of the utility model.

[0017] Figure 3 For the utility model Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0018] Figure 4 For the utility model Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0019] In the figure: 1. high and medium pressure cylinders; 2. low pressure cylinder; 3. turbine shaft; 4. mounting groove; 401. limiting round block; 5. shaft sealing block; 501. fixing groove; 502. transfer pipe; 503. guide groove; 504. guide pipe; 505. guide cavity; 506. soft porcelain insulation board; 6. guide block; 601. working cavity; 602. fan; 603. connecting pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides Figure 1-4The steam seal insulation structure of the high and medium pressure cylinder ends of a steam turbine shown in the figure comprises a high and medium pressure cylinder 1 and a low pressure cylinder 2 provided on one side and a steam turbine shaft 3 provided in the middle. Both sides of the high and medium pressure cylinder 1 and the low pressure cylinder 2 are provided with mounting grooves 4 capable of sealing the steam turbine shaft 3. The interiors of the two mounting grooves 4 are provided with a shaft seal block 5 capable of utilizing internal insulation material to generate insulation effect. The top surface of the shaft seal block 5 is provided with a guide block 6 capable of guiding heat energy on one side to make the internal temperature uniform. When the utility model is in use, the shaft seal block 5 is used to seal the high and medium pressure cylinders 1 on both sides and the steam turbine shaft 3 exposed in the middle of the low pressure cylinder 2. Seal, and then when huge high temperature is generated inside the high and medium pressure cylinders 1, the fan 602 inside the guide block 6 will be used to guide the heat energy on one side to reach the inside of the low pressure cylinder 2 through the transfer tube 502 in the form of hot air, and finally the temperature on both sides will be averaged, and the soft porcelain insulation board 506 will be used to seal the steam turbine shaft 3 at the middle end, so that its working efficiency can be greatly improved, avoiding the inability of most structures to average the temperature at both ends, so that the temperature of the steam turbine shaft 3 on both sides of the turbine is consistent, thereby improving the working efficiency of the steam turbine and reducing the damage rate.

[0022] like Figure 2-3 As shown, the two installation grooves 4 are both arranged inside the high- and medium-pressure cylinders 1 and the low-pressure cylinder 2, and the high- and medium-pressure cylinders 1 and the low-pressure cylinders 2 are both provided with limiting round blocks 401 on both sides of the installation grooves 4, and the two sides of the shaft sealing block 5 are fixedly connected to the inside of the two installation grooves 4, and the shaft sealing block 5 is located on both sides of the inner surface of the high- and medium-pressure cylinders 1 and the low-pressure cylinder 2. Both sides are fixedly connected to the opposite side of the limiting round blocks 401 on both sides of one side, and the limiting round block 401 is an important component for fixing the shaft sealing block 5. A fixing groove 501 is opened inside the shaft sealing block 5, and the interior of the fixing groove 501 is provided with a fixing groove 501. There is a transfer pipe 502, both ends of which extend to the interior of the high and medium pressure cylinder 1 and the low pressure cylinder 2 respectively. A guide groove 503 is provided inside the shaft seal block 5 at the top of the transfer pipe 502, a guide pipe 504 is provided inside the guide groove 503, and a guide cavity 505 is provided inside the guide pipe 504. The setting of the guide cavity 505 can use the heat energy inside the high and medium pressure cylinder 1, which is driven by the fan 602 and reaches the interior of the low pressure cylinder 2 in the form of hot air, thereby finally making the temperature inside the high and medium pressure cylinder 1 consistent with that inside the low pressure cylinder 2.

[0023] like Figure 2 and Figure 4As shown, the inner wall of the shaft seal block 5 is located on both sides of the high and medium pressure cylinders 1 and the low pressure cylinder 2 and is provided with a soft ceramic insulation board 506. The material used for the soft ceramic insulation board 506 is an expanded polystyrene board, also known as an EPS board. The expanded polystyrene board has a strong insulation effect and can store heat energy uniformly inside, so that the volatilization of heat energy is reduced to a minimum. The guide block 6 is fixedly connected to the top surface of the shaft seal block 5. A working cavity 601 is provided inside the guide block 6. The two sides of the inner wall of the working cavity 601 are fixedly connected together with a fan 602. The output end of the fan 602 is fixedly connected with a connecting pipe 603. The bottom end of the connecting pipe 603 passes through the interior of the shaft seal block 5 and extends to the interior. The connecting pipe 603 is an important component for transferring the heat energy carried inside the guide cavity 505 to the inside of the low pressure cylinder 2.

[0024] Working principle of the utility model: when the utility model is in use, firstly, the installation grooves 4 opened on both sides of the high- and medium-pressure cylinders 1 and the low-pressure cylinder 2 are used, and the shaft seal blocks 5 are installed on both sides, so that the high- and medium-pressure cylinders 1 and the low-pressure cylinder 2 can be connected and sealed together. However, when the turbine shaft 3 starts to rotate, huge heat energy will be generated inside the high- and medium-pressure cylinders 1. Then, the fan 602 inside the guide block 6 is turned on, so that the connecting pipe 603 connected to the output end of the fan 602 is continuously guided and transported to the guide cavity 505, so that the heat energy generated inside the high- and medium-pressure cylinders 1 will first use the transfer pipe 502 located inside to carry the internal hot air and allow the hot air to enter the inside. Then, the heat will be guided by the transmission guide of the fan 602, and after a circle of movement inside the shaft seal block 5, it will finally reach the inside of the low-pressure cylinder 2, so that the temperature inside the high- and medium-pressure cylinders 1 is stable, and the heat energy can be transferred to the inside of the low-pressure cylinder 2, so that the two sides of the turbine shaft 3 can obtain a stable temperature without causing too large a temperature difference.

[0025] When the structure is insulated, the heat energy generated at the middle end of the turbine shaft 3 will be stored and insulated due to the setting of the shaft seal block 5 around the middle end. The soft porcelain insulation plate 506 arranged around the inner side of the shaft seal block 5 can be used to store and insulate the temperature of the middle end of the turbine shaft 3, and the efficiency of the work can be guaranteed when the turbine shaft 3 continues to work.

[0026] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam seal insulation structure for the ends of high and medium pressure cylinders of a steam turbine, comprising a high and medium pressure cylinder (1), a low pressure cylinder (2) provided on one side, and a steam turbine shaft (3) provided in the middle, characterized in that: Both sides of the interior of the high- and medium-pressure cylinders (1) and the low-pressure cylinder (2) are provided with mounting grooves (4) capable of sealing the turbine shaft (3); the interiors of the two mounting grooves (4) are provided with a shaft sealing block (5) capable of utilizing internal heat insulation material to produce a heat insulation effect; the top surface of the shaft sealing block (5) is provided with a guide block (6) capable of guiding heat energy on one side to make the internal temperature uniform.

2. A steam seal insulation structure for high and medium pressure cylinder ends of a steam turbine according to claim 1, characterized in that: The two installation grooves (4) are both arranged inside the high- and medium-pressure cylinder (1) and the low-pressure cylinder (2), and the high- and medium-pressure cylinder (1) and the low-pressure cylinder (2) are both provided with limiting round blocks (401) on both sides of the installation grooves (4).

3. A steam seal insulation structure for high and medium pressure cylinder ends of a steam turbine according to claim 2, characterized in that: The two sides of the shaft seal block (5) are fixedly connected to the inside of the two installation grooves (4), and the two sides of the shaft seal block (5) located on the inner surface of the high-pressure cylinder (1) and the low-pressure cylinder (2) are fixedly connected to the opposite side of the two side limit circular blocks (401) on one side.

4. The steam seal insulation structure for the high and medium pressure cylinder ends of a steam turbine according to claim 1, characterized in that: A fixing groove (501) is provided inside the shaft seal block (5), a transfer pipe (502) is provided inside the fixing groove (501), and both ends of the transfer pipe (502) extend to the inside of the high-pressure cylinder (1) and the low-pressure cylinder (2), respectively.

5. A steam turbine high and medium pressure cylinder end steam seal insulation structure according to claim 4, characterized in that: A guide groove (503) is provided inside the shaft seal block (5) at the top end of the transfer tube (502), a guide tube (504) is provided inside the guide groove (503), and a guide cavity (505) is provided inside the guide tube (504).

6. The steam seal insulation structure for the high and medium pressure cylinder ends of a steam turbine according to claim 1, characterized in that: The inner wall of the shaft seal block (5) is provided with soft porcelain insulation plates (506) on both sides of the high and medium pressure cylinders (1) and the low pressure cylinder (2).

7. A steam turbine high and medium pressure cylinder end steam seal insulation structure according to claim 6, characterized in that: The material used for the soft porcelain insulation board (506) is expanded polystyrene board, also known as EPS board.

8. The steam seal insulation structure for the high and medium pressure cylinder ends of a steam turbine according to claim 1, characterized in that: The guide block (6) is fixedly connected to the top surface of the shaft sealing block (5); a working cavity (601) is provided inside the guide block (6); a fan (602) is fixedly connected to both sides of the inner wall of the working cavity (601); an output end of the fan (602) is fixedly connected to a connecting pipe (603); a bottom end of the connecting pipe (603) passes through the interior of the shaft sealing block (5) and extends into the interior.

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