Tool for measuring radial load of sealing ring of main throttle valve of steam turbine

Abstract

The utility model discloses a tool for measuring the radial load of a sealing ring of a main throttle valve of a steam turbine, which relates to the technical field of machining and solves the problem of measuring the radial load of the sealing ring of the main throttle valve of the steam turbine. The sliding plate is slidably installed on the front side face of the bottom plate in the vertical direction. The pressure sensor is installed on the upper surface of the sliding plate, the puller bolt is screwed into the square plate from top to bottom, and the lower end of the puller bolt abuts against the upper surface of the pressure sensor. According to different sizes of the sealing rings, the sliding plate and the fixing plate of different specifications and sizes can be replaced, and the radial load value of the sealing rings of the corresponding sizes can be measured; the device can be used for detecting the radial load values of sealing rings with different specifications and dimensions, and solves the problem that the radial load of the sealing ring of the main throttle valve of the steam turbine is difficult to measure.

Description

Technical Field

[0001] This utility model relates to the technical field of machining, and in particular to a tool for measuring the radial load of the main steam valve sealing ring of a steam turbine. Background Technology

[0002] The primary function of the turbine main steam valve sealing ring is to ensure the sealing performance of the turbine main steam valve. The sealing ring effectively prevents steam leakage from the gap between the main steam valve and the cylinder, thus ensuring that the steam can fully and effectively drive the blades to rotate, improving the turbine's operating efficiency. After the sealing ring is manufactured, the radial load after the sealing plates are tightly pressed together needs to be measured. Because the turbine main steam valve sealing ring has a large diameter, small thickness, and is made of heat-resistant steel with high rigidity, it is difficult to vertically clamp the sealing ring when using a traditional vertical pressure testing machine for radial load measurement, making it challenging to measure the radial load of the sealing ring. Utility Model Content

[0003] To address the aforementioned problem of radial load measurement for turbine main steam valve sealing rings, this invention aims to provide a tool for measuring the radial load of turbine main steam valve sealing rings. The primary function of the turbine main steam valve sealing ring is to ensure the sealing performance of the turbine main steam valve. The sealing ring effectively prevents steam leakage from the gap between the main steam valve and the cylinder, thereby ensuring that steam can effectively drive the blades to rotate and improve turbine operating efficiency. After the sealing ring is manufactured, it is necessary to measure the radial load after the sealing plates are tightly pressed together. Because the turbine main steam valve sealing ring has a large diameter, small thickness, and is made of heat-resistant steel with high rigidity, vertical clamping of the sealing ring is difficult when using a traditional vertical pressure testing machine for radial load measurement, making it challenging to measure the radial load. This patent allows the sealing ring to be horizontally mounted on the radial load testing tool, more closely approximating its working state, thus solving the problem of radial load measurement.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A radial load measuring tool for a steam turbine main valve sealing ring includes: a base plate 1, a sliding plate 2, a tightening bolt 3, a pressure sensor 5, a fixing plate 7, and a square plate 8. The square plate 8, sliding plate 2, and fixing plate 7 are arranged sequentially from top to bottom. The square plate 8 and fixing plate 7 are both connected to the front side of the base plate 1. The sliding plate 2 is slidably mounted on the front side of the base plate 1 in the vertical direction. The pressure sensor 5 is mounted on the upper surface of the sliding plate 2. The tightening bolt 3 is screwed into the square plate 8 from top to bottom, and the lower end of the tightening bolt 3 abuts against the upper surface of the pressure sensor 5.

[0006] The aforementioned turbine main steam valve sealing ring radial load measuring tool has a first semi-circular groove 21 on the slide plate 2 that matches the turbine main steam valve sealing ring.

[0007] The aforementioned turbine main steam valve sealing ring radial load measuring tool has a second semi-circular groove 71 on the fixing plate 7 that matches the turbine main steam valve sealing ring.

[0008] The aforementioned turbine main steam valve sealing ring radial load measuring tool, wherein the first groove 21 and the second groove 71 together form an inner hole for detecting the turbine main steam valve sealing ring.

[0009] The aforementioned turbine main steam valve sealing ring radial load measuring tool further includes: a guide key 4, a sliding groove 11 along the vertical direction is provided on the front side of the base plate 1, the guide key 4 is slidably installed in the sliding groove 11, and the guide key 4 is connected to the rear side of the slide plate 2.

[0010] The aforementioned turbine main steam valve sealing ring radial load measuring tool further includes: hexagon socket head cap screws 6, and the fixing plate 7 and the base plate 1 are connected by a plurality of hexagon socket head cap screws 6.

[0011] The aforementioned turbine main steam valve sealing ring radial load measuring tool, wherein the square plate 8 and the base plate 1 are welded together.

[0012] The aforementioned turbine main steam valve sealing ring radial load measuring tool has a tapping hole on the square plate 8, and the tightening bolt 3 is installed in the tapping hole.

[0013] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0014] (1) In this utility model, different sizes of sliding plate and fixing plate can be replaced according to the different sizes of sealing ring to realize the radial load value of sealing ring of corresponding size. The sliding plate and fixing plate are detachably connected to the base plate. This utility model can be used to detect the radial load value of sealing ring of different sizes, and solves the problem of difficult measurement of radial load of main steam valve sealing ring of steam turbine.

[0015] (2) In this utility model, the no-load value on the pressure sensor is recorded in the no-load mode, and the experimental value on the pressure sensor obtained under the loaded state is subtracted from the no-load value to obtain the radial load value of the sealing ring. This method can eliminate the influence of factors such as friction on the experimental value and obtain a more accurate radial load value of the sealing ring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a radial load measuring tool for the main steam valve sealing ring of a steam turbine according to this utility model.

[0017] Figure 2This is a side sectional view of a radial load measuring tool for the main steam valve sealing ring of a steam turbine according to this utility model.

[0018] In the attached diagram: 1. Base plate; 2. Slide plate; 3. Tightening bolt; 4. Guide key; 5. Pressure sensor; 6. Socket head cap screw; 7. Fixing plate; 8. Square plate; 11. Sliding groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] Please refer to Figure 1 and Figure 2 As shown, a radial load measuring tool for the main steam valve sealing ring of a steam turbine is illustrated, comprising: a base plate 1, a sliding plate 2, a tightening bolt 3, a guide key 4, a pressure sensor 5, an internal hexagonal head screw 6, and a fixing plate 7;

[0021] Instructions for use: Install guide keys 4 on the base plate 1, then slide the slide plate 2 onto the base plate 1 via guide keys 4, ensuring that the slide plate 2 slides freely on the base plate 1 without jamming. Install a pressure sensor 5 on the outer end face of the slide plate 2, and install a fixing plate 7 on the opposite side of the slide plate 2. The fixing plate 7 is installed on the base plate 1 using hexagon socket head cap screws 6. Machining inner holes with a diameter 1 mm larger than the diameter of the sealing ring and a depth 5 mm greater than the thickness of the sealing ring on the slide plate 2 and the fixing plate 7, with the distance between the inner end faces of the slide plate 2 and the center of the fixing plate 7 being 10 mm. A square plate 8 is welded to the outer end face of the base plate 1, and screw holes are drilled and tapped in the square plate 8. Tightening bolts 3 are screwed into the screw holes. Before use, rotate the tightening bolts 3 so that they press against the pressure sensor 5, allowing the slide plate 2 to move smoothly while recording the value on the pressure sensor 5. When measuring the radial load of the sealing ring, first install the sealing ring into the inner holes of the slide plate 2 and the fixed plate 7. Rotate the tightening bolt 3 to make the slide plate 2 radially press the sealing ring together through the pressure sensor 5, so that the sealing ring plates come together. After reaching the design value, record the value of the pressure sensor 5. Subtract the value of the pressure sensor 5 when the slide plate moves without the sealing ring from the recorded value to obtain the radial load value of the sealing ring. Compare the radial load value with the design requirements in the drawing to determine whether the radial load is qualified.

[0022] Furthermore, in a preferred embodiment, a guide key 4 is installed on the base plate 1, and then the slide plate 2 is connected to the base plate 1 through the guide key 4. The slide plate 2 slides freely on the base plate 1 without any jamming.

[0023] Furthermore, in a preferred embodiment, a pressure sensor 5 is installed on the outer end face of the slide plate 2.

[0024] Furthermore, in a preferred embodiment, a fixing plate 7 is mounted opposite the slide plate 2, and the fixing plate 7 is secured to the base plate 1 using hexagon socket head cap screws 6. Preferably, an inner hole with a diameter 1 mm larger than the diameter of the sealing ring is machined on the slide plate 2 and the fixing plate 7, and the hole depth is 5 mm larger than the thickness of the sealing ring. The end face of the inner hole enclosed by the slide plate 2 and the fixing plate 7 is 10 mm away from the center.

[0025] Furthermore, in a preferred embodiment, a square plate 8 is welded to the outer end face of the base plate 1, and screw holes are drilled and tapped on the square plate 8, with tightening bolts 3 screwed into the screw holes.

[0026] Furthermore, in a preferred embodiment, the sealing ring is installed into the inner hole enclosed by the slide plate 2 and the fixing plate 7, and the top bolt 3 is rotated to make the slide plate 2 radially press the sealing ring through the pressure sensor 5, so that the sealing ring stacks come together.

[0027] Furthermore, in a preferred embodiment, the present invention has a simple structure and is safe to operate. After replacing the slide plate 2 and the fixing plate 7, the radial load of the sealing ring of the corresponding diameter can be measured, which solves the problem of the difficulty in measuring the radial load of the main steam valve sealing ring of the steam turbine.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model.

[0029] Based on the above, this utility model also has the following embodiments:

[0030] In a further embodiment of this utility model, the slide plate 2 and the fixing plate 7 of different specifications and sizes can be replaced according to the different sizes of the sealing ring to realize the radial load value of the sealing ring of the corresponding size. The slide plate 2 and the fixing plate 7 are detachably connected to the base plate 1. This utility model can be used to detect the radial load value of sealing rings of different specifications and sizes, and solves the problem of difficult radial load measurement of the main steam valve sealing ring of the steam turbine.

[0031] In a further embodiment of this utility model, the no-load value on the pressure sensor 5 is recorded in an unloaded manner, and then the experimental value on the pressure sensor 5 obtained under the loaded state is subtracted from the no-load value to obtain the radial load value of the sealing ring. This method can eliminate the influence of factors such as friction on the experimental value and obtain a more accurate radial load value of the sealing ring.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tool for measuring the radial load of a seal ring of a main steam valve of a steam turbine, characterized in that It include: The bottom plate (1), sliding plate (2), top bolt (3), pressure sensor (5), fixed plate (7) and square plate (8), square plate (8), sliding plate (2) and fixed plate (7) are arranged from top to bottom, square plate (8) and fixed plate (7) are connected with the front side of the bottom plate (1), and the sliding plate (2) is slidably installed on the front side of the bottom plate (1) in the up-down direction; the pressure sensor (5) is installed on the upper surface of the sliding plate (2), the top bolt (3) is screwed into the square plate (8) from top to bottom, and the lower end of the top bolt (3) abuts against the upper surface of the pressure sensor (5).

2. The steam turbine main steam valve seal ring radial load measuring tool of claim 1, wherein, The sliding plate (2) is provided with a semicircular first groove (21) matched with the sealing ring of the turbine main valve.

3. The steam turbine main steam valve seal ring radial load measuring tool of claim 2, wherein, The fixed plate (7) is provided with a semicircular second groove (71) matched with the sealing ring of the turbine main valve.

4. The steam turbine main steam valve seal ring radial load measuring tool of claim 3, wherein, The first groove (21) and the second groove (71) form an inner hole for detecting the sealing ring of the turbine main valve.

5. The steam turbine main steam valve seal ring radial load measuring tool of claim 1, wherein, It also includes: The front side of the bottom plate (1) is provided with a sliding groove (11) in the up-down direction, and the guide key (4) is slidably installed in the sliding groove (11), and the guide key (4) is connected with the rear side of the sliding plate (2).

6. The steam turbine main steam valve seal ring radial load measuring tool of claim 1, wherein, It also includes: The fixed plate (7) and the bottom plate (1) are connected by a plurality of hexagonal head screws (6).

7. The steam turbine main steam valve seal ring radial load measuring tool of claim 1, wherein, The square plate (8) and the bottom plate (1) are welded.

8. The radial load measurement tool for a main steam valve seal ring of a steam turbine as claimed in claim 1, wherein, The square plate (8) is provided with a tapped hole, and the top bolt (3) is installed in the tapped hole.

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