Driving structure of medium-pressure regulating valve of steam turbine

Abstract

The utility model discloses a driving structure of a medium pressure regulating valve of a steam turbine, which is characterized in that a connecting side rod extending between adjacent connecting vertical rods is fixed on the side wall of a valve rod corresponding to a cavity, a lifting rod is connected on the side wall of a top seat corresponding to the right upper part of the connecting side rod, and the bottom of the lifting rod is connected with the connecting side rod; a piston cylinder is arranged on the side wall of the top seat and located on the side of the lifting rod, the end of a piston rod of the piston cylinder is fixed to the lifting rod, a fixing frame is fixedly arranged on the side wall of the top seat, and the lifting rod moves along a guide through hole of the fixing frame. According to the driving structure of the steam turbine medium-pressure regulating valve, the piston rod directly drives the lifting rod to move up and down, the piston rod only needs to bear small torque generated by the lifting rod on the piston rod, and the torque borne by the piston rod is obviously reduced; the piston rod of the piston cylinder is prevented from being bent and even broken due to bearing large torque for a long time in the process of driving the valve rod to move up and down, the service life is prolonged, and normal use of the medium-pressure regulating valve is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of a steam turbine intermediate pressure regulating valve, specifically to a drive structure for a steam turbine intermediate pressure regulating valve. Background Technology

[0002] The main functions of the intermediate-pressure regulating valve in a steam turbine include regulating steam flow, controlling turbine speed, and output power. The valve controls steam flow by changing its opening degree, thereby regulating the steam intake of the turbine. Before the turbine generator unit is under load, different valve opening degrees correspond to different speeds; after grid connection and load operation, different opening degrees correspond to different loads. During turbine operation, the intermediate-pressure regulating valve can quickly respond to load changes, adjust steam flow, and thus control turbine speed and output power. By optimizing the valve opening degree, steam throttling losses can be reduced, improving unit operating efficiency.

[0003] During normal operation of a steam turbine, the intermediate-pressure regulating valve requires frequent adjustment to ensure stable turbine operation. The valve opening is adjusted by the up-and-down movement of the valve stem, typically driven by the piston rod of a piston cylinder. Due to the valve's unique structure, there is no space directly above the valve stem to mount a piston cylinder for driving it. Instead, a side rod fixed to the valve stem's side wall connects to the end of the piston rod of the piston cylinder fixed to the valve body, thus driving the valve stem's up-and-down movement. However, because the steam inside the intermediate-pressure regulating valve is pressurized, and the valve stem and piston rod cannot be aligned coaxially, both the piston rod and valve stem experience significant additional torque during operation. This can lead to bending or even breakage of the piston rod or valve stem after a period of use. Currently, there is no effective solution to this technical problem. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a drive structure for a turbine intermediate-pressure regulating valve. The piston rod extending downward from the piston cylinder is connected to a connecting side rod fixed to the side wall of the valve rod via a lifting rod, and the lifting rod is located directly above the connecting side rod. This facilitates the piston cylinder to drive the valve rod of the turbine intermediate-pressure regulating valve to move up and down. The piston rod directly drives the lifting rod to move up and down. Since the lifting rod and the piston cylinder are adjacent, the piston rod only needs to bear a small torque generated by the lifting rod, which significantly reduces the torque borne by the piston rod. This avoids the piston rod of the piston cylinder bearing a large torque for a long time during the process of driving the valve rod to move up and down, which could lead to bending or even breakage of the piston rod, thus extending its service life and ensuring the normal use of the intermediate-pressure regulating valve.

[0005] The technical solution adopted by this utility model is:

[0006] The drive structure of the intermediate pressure regulating valve of a steam turbine includes a top seat fixed to the top of the valve body via a connecting rod. The valve stem of the valve body extends upward from the top of the valve body and is movably connected to the bottom of the top seat. A cavity is formed between the top of the valve body, the bottom of the top seat, and the connecting rod. A connecting side rod extending outward from between two adjacent connecting rods is fixed to the side wall of the valve stem corresponding to the position of the cavity. A lifting rod is movably connected to the side wall of the top seat directly above the position of the connecting side rod. The bottom of the lifting rod is connected to one end of the connecting side rod extending out of the cavity. A piston cylinder is also fixed to the side wall of the top seat, located on the side of the lifting rod. The piston rod end extending downward from the piston cylinder is fixed to the lifting rod. The movement direction of the piston rod and the movement direction of the lifting rod are both parallel to the movement direction of the valve stem. A fixing frame is fixed to the side wall of the top seat, and the lifting rod moves along the guide hole provided by the fixing frame.

[0007] A further improvement of this utility model is that a connecting block is coaxially fixed at the position of the valve stem corresponding to the position of the connecting side rod, and the connecting side rod is fixed to the side wall of the connecting block.

[0008] A further improvement of this utility model is that the side wall of the connecting block makes limiting contact with the inner side wall of the connecting rod, and the valve stem is guided by the connection limiting of the connecting block and the connecting rod.

[0009] A further improvement of this utility model is that a connecting frame is fixed to the bottom of the lifting rod, the connecting frame is fixedly connected to the connecting side rod through an adjusting connecting device, and the connecting frame is fixedly connected to the bottom end of the piston rod.

[0010] A further improvement of this utility model is that the adjusting connection device includes an adjusting bolt and connectors respectively connected to both ends of the adjusting bolt, one connector being connected to the connecting side rod and the other connector being connected to the connecting frame.

[0011] A further improvement of this utility model is that the bottom of the connecting frame is fixed with a connecting seat for connecting to the connecting head, and the connecting seat is provided with a horizontal connecting shaft for connecting to the connecting head, and the horizontal connecting shaft is perpendicular to the connecting side rod.

[0012] A further improvement of this utility model is that the piston rod is locked and fixed to the connecting frame by a locking nut.

[0013] A further improvement of this utility model is that the top end of the lifting rod extends upward to the top of the fixed frame, and the bottom end of the lifting rod extends downward to the bottom of the fixed frame. When the valve rod moves upward to the maximum stroke, the bottom end of the lifting rod is still located below the fixed frame, and when the valve rod moves downward to the maximum stroke, the top end of the lifting rod is still located above the fixed frame.

[0014] A further improvement of this utility model is that the side wall of the lifting rod is provided with guide ribs along the axial direction, and the guide through hole of the fixing frame is provided with a matching guide groove for the guide ribs.

[0015] A further improvement of this utility model is that each lifting rod is provided with a set of piston cylinders, and each set of piston cylinders has multiple cylinders, which are symmetrically arranged on both sides of the lifting rod.

[0016] The beneficial effects of this utility model are as follows:

[0017] First, the drive structure of the turbine intermediate-pressure regulating valve of this utility model has a piston rod extending downward from the piston cylinder connected to a connecting side rod fixed to the valve rod side wall via a lifting rod. The lifting rod is located directly above the connecting side rod, which facilitates the piston cylinder to drive the valve rod of the turbine intermediate-pressure regulating valve to move up and down. The piston rod directly drives the lifting rod to move up and down. Since the lifting rod and the piston cylinder are adjacent, the piston rod only needs to bear a small torque generated by the lifting rod, which significantly reduces the torque borne by the piston rod. This avoids the piston rod of the piston cylinder bearing a large torque for a long time during the process of driving the valve rod to move up and down, which could lead to the piston rod bending or even breaking. This extends the service life and ensures the normal use of the intermediate-pressure regulating valve.

[0018] Secondly, the drive structure of the turbine intermediate pressure regulating valve of this utility model, through the connecting block provided on the valve stem, can not only shorten the length of the connecting side rod, thereby increasing the upper limit of the torque that the connecting side rod and the valve stem can withstand, thus avoiding the twisting or breakage of the connecting side rod, but also prevent the valve stem from bending due to long-term torque and affecting the normal operation of the valve stem. In addition, the connecting block can also play a limiting and guiding role for the valve stem when it is raised and lowered, ensuring that the valve stem can always move vertically up and down during operation.

[0019] Third, the drive structure of the turbine intermediate pressure regulating valve of this utility model uses piston cylinders symmetrically arranged on both sides of the lifting rod, thereby making the force on the lifting rod more balanced, ensuring the service life of the lifting rod, and reducing the force required by a single piston rod, further reducing the torque borne by the piston rod. Thus, a piston rod with a slender cylinder and slender rod can be used, thereby increasing the lifting speed of the lifting rod and improving the regulating efficiency of the intermediate pressure regulating valve under the working state of a single oil pump.

[0020] Fourth, the drive structure of the turbine intermediate pressure regulating valve of this utility model, through the guide ribs provided on the lifting rod, can not only further guide the lifting rod, but also provide the lifting rod with anti-torsion capacity and extend the service life of the lifting rod.

[0021] Fifth, the drive structure of the turbine intermediate pressure regulating valve of this utility model, through the function of the adjustment connection device, can improve the connection between the lifting rod and the valve stem of intermediate pressure regulating valves of different models and sizes, thereby improving the applicability of this utility model.

[0022] Sixth, the drive structure of the turbine intermediate pressure regulating valve of this utility model ensures the balance of the force direction of the regulating connection device by connecting the horizontal connecting shaft of the connector fixed to the connecting seat of the connecting frame and the connecting side rod, thereby further improving the service life of the regulating connection device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this application. Detailed Implementation

[0024] like Figure 1 It is known that the drive structure of the turbine intermediate pressure regulating valve includes a top seat 2 fixed to the top of the valve body 1 by a connecting rod 3. The valve stem 4 of the valve body 1 extends upward from the top of the valve body 1 and is movably connected to the bottom of the top seat 2. The top of the valve body 1, the bottom of the top seat 2 and the connecting rod 3 form a cavity 10. A connecting side rod 9 extending outward from between two adjacent connecting rods 3 is fixed to the side wall of the valve stem 4 corresponding to the position of the cavity 10. A lifting rod 8 is movably connected to the side wall of the top seat 2 directly above the position of the connecting side rod 9. The bottom of the lifting rod 8 is connected to the end of the connecting side rod 9 that extends out of the cavity 10. A piston cylinder 6 is also fixed to the side wall of the top seat 2 and to the side of the lifting rod 8. The end of the piston rod 11 extending downward from the piston cylinder 6 is fixed to the lifting rod 8. The movement direction of the piston rod 11 and the movement direction of the lifting rod 8 are both parallel to the movement direction of the valve stem 4. A fixing frame 7 is fixed to the side wall of the top seat 2. The lifting rod 8 moves along the guide hole provided by the fixing frame 7.

[0025] The valve stem 4 is coaxially fixed with a connecting block 5 at the position corresponding to the connecting side rod 9, and the connecting side rod 9 is fixed to the side wall of the connecting block 5.

[0026] The side wall of the connecting block 5 is in limiting contact with the inner side wall of the connecting rod 3, and the valve stem 4 is guided by the connection limiting of the connecting block 5 and the connecting rod 3.

[0027] The bottom of the lifting rod 8 is fixed with a connecting frame 12, which is fixedly connected to the connecting side rod 9 through an adjusting connecting device. The connecting frame 12 is also fixedly connected to the bottom end of the piston rod 11.

[0028] The adjusting connection device includes an adjusting bolt 14 and connectors 13 connected to both ends of the adjusting bolt 14. One connector 13 is connected to the connecting side rod 9, and the other connector 13 is connected to the connecting frame 12.

[0029] The bottom of the connecting frame 12 is fixed with a connecting seat 15 for connecting to the connector 13. The connecting seat 15 is provided with a horizontal connecting shaft for connecting to the connector 13. The horizontal connecting shaft is perpendicular to the connecting side rod 9.

[0030] The piston rod 11 is locked and fixed to the connecting frame 12 by the locking nut 17.

[0031] The top end of the lifting rod 8 extends upward beyond the top of the fixed frame 7, and the bottom end of the lifting rod 8 extends downward beyond the bottom of the fixed frame 7. When the valve rod 4 moves upward to the maximum stroke, the bottom end of the lifting rod 8 is still below the fixed frame 7. When the valve rod 4 moves downward to the maximum stroke, the top end of the lifting rod 8 is still above the fixed frame 7.

[0032] The side wall of the lifting rod 8 is provided with guide ribs 16 along the axial direction, and the guide through hole of the fixing frame 7 is provided with a matching guide groove for the guide ribs 16.

[0033] Each lifting rod 8 is provided with a set of piston cylinders 6, and each set of piston cylinders 6 has multiple cylinders, which are symmetrically arranged on both sides of the lifting rod 8.

[0034] The fixing bracket 7 extends to the position of the piston cylinder 6 and fixes the piston cylinder 6 to the side wall of the top seat 2.

[0035] All piston cylinders 6 have slender cylinder bodies.

[0036] The connecting side rods 9 are provided in multiple sizes and are evenly distributed around the axis of the valve stem 4.

[0037] When this utility model is in use, the piston rod 11 of the piston cylinder 6 retracts upward or extends downward, thereby driving the lifting rod 8 to rise or fall. In turn, the connecting side rod 9 drives the connecting block 5 and the valve rod 4 to move up and down, thereby enabling the turbine intermediate pressure regulating valve to be adjusted.

Claims

1. The drive structure of the intermediate pressure regulating valve of a steam turbine, characterized in that: The valve body (1) includes a top seat (2) fixed to the top of the valve body (1) by a connecting rod (3). The valve stem (4) of the valve body (1) extends upward from the top of the valve body (1) and is movably connected to the bottom of the top seat (2). A cavity (10) is formed between the top of the valve body (1), the bottom of the top seat (2), and the connecting rod (3). A connecting side rod (9) extending outward from between two adjacent connecting rods (3) is fixed to the side wall of the valve stem (4) at the position corresponding to the cavity (10). The side wall of the top seat (2) is movably connected to the top of the connecting side rod (9) directly above the position corresponding to the position of the connecting side rod (9). There is a lifting rod (8), the bottom of which is connected to one end of the connecting side rod (9) extending out of the cavity (10). A piston cylinder (6) is also fixed on the side wall of the top seat (2) and on the side of the lifting rod (8). The end of the piston rod (11) extending downward from the piston cylinder (6) is fixed to the lifting rod (8). The direction of movement of the piston rod (11) and the direction of movement of the lifting rod (8) are parallel to the direction of movement of the valve rod (4). A fixing frame (7) is fixed on the side wall of the top seat (2), and the lifting rod (8) moves along the guide through hole provided by the fixing frame (7).

2. The drive structure of the turbine intermediate pressure regulating valve as described in claim 1, characterized in that: The valve stem (4) is coaxially fixed with a connecting block (5) at the position corresponding to the connecting side rod (9), and the connecting side rod (9) is fixed to the side wall of the connecting block (5).

3. The drive structure of the turbine intermediate pressure regulating valve as described in claim 2, characterized in that: The side wall of the connecting block (5) is in limiting contact with the inner side wall of the connecting rod (3), and the valve stem (4) is guided by the connection limiting of the connecting block (5) and the connecting rod (3).

4. The drive structure of the turbine intermediate pressure regulating valve as described in claim 1, characterized in that: The bottom of the lifting rod (8) is fixed with a connecting frame (12), which is fixedly connected to the connecting side rod (9) through an adjusting connecting device, and the connecting frame (12) is fixedly connected to the bottom end of the piston rod (11).

5. The drive structure of the turbine intermediate pressure regulating valve as described in claim 4, characterized in that: The adjusting connection device includes an adjusting bolt (14) and connectors (13) connected to both ends of the adjusting bolt (14), one connector (13) being connected to the connecting side rod (9) and the other connector (13) being connected to the connecting frame (12).

6. The drive structure of the turbine intermediate pressure regulating valve as described in claim 5, characterized in that: The bottom of the connecting frame (12) is fixed with a connecting seat (15) for connecting with the connecting head (13). The connecting seat (15) is provided with a horizontal connecting shaft for connecting with the connecting head (13). The horizontal connecting shaft is perpendicular to the connecting side rod (9).

7. The drive structure of the turbine intermediate pressure regulating valve as described in claim 4, characterized in that: The piston rod (11) is locked and fixed to the connecting frame (12) by a locking nut (17).

8. The drive structure of the turbine intermediate pressure regulating valve as described in claim 1, characterized in that: The top end of the lifting rod (8) extends upward to the top of the fixed frame (7), and the bottom end of the lifting rod (8) extends downward to the bottom of the fixed frame (7). When the valve rod (4) moves upward to the maximum stroke, the bottom end of the lifting rod (8) is still below the fixed frame (7). When the valve rod (4) moves downward to the maximum stroke, the top end of the lifting rod (8) is still above the fixed frame (7).

9. The drive structure of the turbine intermediate pressure regulating valve as described in claim 1, characterized in that: The side wall of the lifting rod (8) is provided with guide ribs (16) along the axial direction, and the guide through hole of the fixing frame (7) is provided with a matching guide groove for the guide ribs (16).

10. The drive structure of the turbine intermediate pressure regulating valve as described in claim 1, characterized in that: Each lifting rod (8) is provided with a set of piston cylinders (6), and each set of piston cylinders (6) is provided with multiple piston cylinders, which are symmetrically arranged on both sides of the lifting rod (8).

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