A built-in plate-type regulating valve for regulating the extraction steam pressure of a steam turbine

Abstract

A built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine, which relates to a built-in plate-type regulating valve. The present invention aims to solve the problem that the existing high-parameter steam turbine extraction pressure adjustment has a complex internal cylinder structure and poor operating reliability. The valve body (4) of the present invention is mounted on the steam turbine rotor (7), and a sealing device (6) is installed between the valve body (4) and the steam turbine rotor (7). The cylinder (2) is mounted on the valve body (4), and a rectangular groove (8) is provided at the window through which steam flows on the valve body (4). The left and right end surfaces of the rectangular groove (8) on the steam outlet side are respectively provided with an inclined surface (9). The valve plate (5) is inserted into the rectangular groove (8), the lower end of the valve stem (3) is fixedly connected to the valve plate (5), and the upper end of the valve stem (3) passes through the valve body (4) and the cylinder (2) and is installed on the cylinder (2) through the valve cover (1). The present invention is used for regulating the extraction pressure of a steam turbine.

Description

Technical Field

[0001] The invention relates to a built-in plate-type regulating valve, in particular to a built-in plate-type regulating valve used for regulating the extraction steam pressure of a steam turbine. Background Art

[0002] Adjustment of the extraction steam turbine In order to accurately adjust the extraction pressure, two methods can be used. One is to lead the steam in the cylinder out of the cylinder through a pipe, and then adjust the pressure through a regulating valve, and then lead the remaining steam back into the cylinder. However, this method leads to a complex cylinder structure, a large increase in axial dimensions, and even requires a cylinder split design. In addition, there are many pipes and adjustment equipment for extraction, which takes up a large space. The other method is to use a rotating diaphragm in the cylinder, but it is limited to low-parameter extraction pressure adjustment. Otherwise, it will cause problems such as deformation and jamming of the rotating diaphragm, and the design and manufacturing of the rotating diaphragm are complex and have low reliability.

[0003] In summary, the existing high-parameter steam turbine extraction pressure adjustment has the problems of complex internal cylinder structure and poor operation reliability. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing high-parameter steam turbine extraction pressure adjustment has a complex internal cylinder structure and poor operating reliability, and further provide a built-in plate-type regulating valve for adjusting the steam turbine extraction pressure.

[0005] The technical solution of the present invention is: a built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine, which includes a cylinder, a valve cover, a valve stem, a valve body, a valve plate, a sealing device and a steam turbine rotor. The valve body is composed of two horizontally divided upper and lower halves that are buckled together. The valve body is sleeved on the steam turbine rotor, and a sealing device is installed between the valve body and the steam turbine rotor. The cylinder is sleeved on the valve body, and a rectangular groove is provided at a window on the valve body through which steam flows. An inclined surface is respectively provided on the left and right end faces of the steam outlet side of the rectangular groove. The valve plate is inserted in the rectangular groove, and the lower end of the valve stem is fixedly connected to the valve plate. The upper end of the valve stem passes through the valve body and the cylinder and is installed on the cylinder through the valve cover.

[0006] Furthermore, the cylinder and the valve body are connected via a boss.

[0007] Further, the outer dimension of the valve plate is smaller than the inner dimension of the rectangular channel.

[0008] Furthermore, the valve plate is in contact with the inclined surface of the rectangular groove, and a gap is left between the other side end surface of the valve plate and the rectangular groove.

[0009] Furthermore, the valve stem and the valve plate are clearance-matched with the valve body and the cylinder.

[0010] Compared with the prior art, the present invention has the following effects:

[0011] The invention discloses a built-in plate-type regulating valve capable of accurately regulating the extraction pressure by operating outside the cylinder, and the use conditions of the valve are not limited by steam parameters. The built-in plate-type regulating valve of the invention has a small axial dimension, a simple structure, high reliability, convenient installation and maintenance, easy control and operation, and has an accurate extraction pressure regulating function. The use conditions are not limited by steam parameters, and neither the safety of the steam turbine nor the flow efficiency of the steam turbine is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic axial cross-sectional view of the structure of the present invention installed between the flow passages inside the cylinder.

[0013] Figure 2 It is a transverse cross-sectional view of a built-in plate-type regulating valve.

[0014] Figure 3 It is a schematic diagram of the structural coordination between the valve plate and the valve body and their mutual guiding and positioning. DETAILED DESCRIPTION

[0015] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment is a built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine, which includes a cylinder 2, a valve cover 1, a valve stem 3, a valve body 4, a valve plate 5, a sealing device 6 and a steam turbine rotor 7. The valve body 4 is composed of two horizontally divided upper and lower halves that are buckled together. The valve body 4 is sleeved on the steam turbine rotor 7, and a sealing device 6 is installed between the valve body 4 and the steam turbine rotor 7. The cylinder 2 is sleeved on the valve body 4, and a rectangular groove 8 is provided at a window on the valve body 4 through which steam flows. An inclined surface 9 is respectively provided on the left and right end surfaces of the steam outlet side of the rectangular groove 8. The valve plate 5 is inserted into the rectangular groove 8, and the lower end of the valve stem 3 is fixedly connected to the valve plate 5. The upper end of the valve stem 3 passes through the valve body 4 and the cylinder 2 and is installed on the cylinder 2 through the valve cover 1.

[0016] The built-in plate-type regulating valve of this embodiment does not need to complicate the internal structure of the steam turbine, and only needs to provide the groove and rectangular groove of the valve stem and valve plate. It effectively solves the problem of having the ability to adjust the extraction pressure of high-parameter steam without complicating the cylinder structure of the steam turbine and lengthening the axial dimension of the cylinder.

[0017] Specific implementation method 2: Combination Figure 1 to Figure 2 To explain this embodiment, the cylinder 2 and the valve body 4 of this embodiment are connected by a boss. Such a configuration can better position and support the cylinder 2 and the valve body 4. Other components and connection relationships are the same as those of the first embodiment.

[0018] Specific implementation method three: Combination Figure 1 to Figure 2 To explain this embodiment, the outer dimension of the valve plate 5 of this embodiment is smaller than the inner dimension of the rectangular groove 8. This arrangement enables the valve plate 5 to be freely opened and closed along the axis direction of the valve stem 3 in the groove, and also limits the lateral movement distance of the valve plate 5. Other components and connection relationships are the same as those of the second embodiment.

[0019] Specific implementation method four: Combination Figure 1 to Figure 2 This embodiment is described. The valve plate 5 of this embodiment is in contact with the inclined surface 9 between the rectangular groove 8, and a gap is left between the other side end surface of the valve plate 5 and the rectangular groove 8. In this way, the inclined surface 9 can not only guide and position the valve plate, but also seal it. Other components and connection relationships are the same as those of the third embodiment.

[0020] Specific implementation method five: Combination Figure 1 to Figure 2 This embodiment is described. The valve stem 3 and valve plate 5 of this embodiment are clearance-matched with the valve body 4 and the cylinder 2. This arrangement facilitates the rapid and flexible up and down movement of the valve stem and valve plate. Other components and connection relationships are the same as those of the first, second, third or fourth embodiments.

[0021] Combination Figure 1 and Figure 2 The present embodiment is described. The built-in plate-type regulating valve of the present embodiment comprises main parts such as a valve body assembly 4, a valve stem 3, a valve plate 5, a valve cover and a sealing connector 1 assembled in a cylinder 2. The valve body assembly 4 of the built-in plate-type regulating valve is positioned and supported by a boss between the cylinder 2. The valve body assembly 4 is composed of two halves that are horizontally divided into an upper and a lower part. The assembled valve body forms a circular whole through a connector. The valve body is provided with windows for steam to flow through. Each window corresponds to a set of valve assemblies. The number and size of the windows need to be determined by calculation. A rectangular groove suitable for inserting the valve plate 5 is provided inside the valve body parallel to the end face of the valve body 4. The size of the groove is slightly larger than the size of the valve plate 5, so that the valve plate 5 can be freely opened and closed along the axis direction of the valve stem 3 in the groove, and the lateral movement distance of the valve plate 5 can be limited. A steam sealing device 6 is provided between the valve body 4 and the turbine rotor 7 to ensure that the steam will not leak too much between the two components. The built-in plate-type regulating valve is placed on the stage of the throughflow 8 that needs to extract steam. The valve stem 3 connected to the valve plate 5 extends out of the cylinder through the groove on the cylinder, passes through the sealing member on the valve cover 1, and is connected to the actuator.

[0022] Combination Figure 2 and Figure 3In this embodiment, the left and right end surfaces of the rectangular channel of the valve body 4 are provided with inclined surfaces for guiding and positioning the valve plate 5 when opening and closing, and the inclined surfaces also play a sealing role. Since the valve body 4 and the valve plate 5 are in contact only through the inclined surfaces, the friction between the two is reduced. The matching clearance between the valve body 4 and the valve plate 5 allows some steam leakage, which can reduce the opening force of the valve plate 5.

[0023] Working principle of the present invention:

[0024] When the built-in plate-type regulating valve is in use, if it is necessary to increase the extraction pressure on the steam inlet side of the valve, it is only necessary to move the valve plate 5 axially and close the steam flow window on the valve body 4; if it is necessary to reduce the extraction pressure on the steam inlet side of the valve, it is necessary to move the valve plate 5 axially in the opposite direction and open the steam flow window on the valve body 4.

Claims

1. A built-in plate-type regulating valve for regulating extraction pressure of a steam turbine, comprising a cylinder (2), characterized in that: It also includes a valve cover (1), a valve stem (3), a valve body (4), a valve plate (5), a sealing device (6) and a steam turbine rotor (7). The valve body (4) is composed of two horizontally divided upper and lower halves that are buckled together. The valve body (4) is mounted on the turbine rotor (7), and a sealing device (6) is installed between the valve body (4) and the turbine rotor (7). The cylinder (2) is mounted on the valve body (4). A rectangular groove (8) is provided at a window on the valve body (4) through which steam flows. An inclined surface (9) is provided on the left and right end surfaces of the steam outlet side of the rectangular groove (8). The valve plate (5) is inserted into the rectangular groove (8). The lower end of the valve stem (3) is fixedly connected to the valve plate (5). The upper end of the valve stem (3) passes through the valve body (4) and the cylinder (2) and is then mounted on the cylinder (2) through the valve cover (1). The inclined surface (9) between the valve plate (5) and the rectangular groove (8) is in contact, and a gap is left between the other side end surfaces of the valve plate (5) and the rectangular groove (8). The inclined surface (9) is used to guide and position the valve plate (5) when opening and closing. The inclined surface (9) also plays a sealing role. The matching clearance between the valve body (4) and the valve plate (5) allows some steam to leak, thereby reducing the opening force of the valve plate (5).

2. The built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine according to claim 1, characterized in that: The cylinder (2) and the valve body (4) are connected via a boss.

3. The built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine according to claim 2, characterized in that: The outer dimension of the valve plate (5) is smaller than the inner dimension of the rectangular channel (8).

4. The built-in plate-type regulating valve for regulating the extraction pressure of a steam turbine according to claim 3, characterized in that: The valve stem (3) and the valve plate (5) are clearance-matched with the valve body (4) and the cylinder (2).

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