Steam turbine speed regulating valve bush of spray-welding integrated structure

Abstract

The utility model relates to the technical field of steam turbine valves, in particular to a steam turbine speed regulating valve bush with a spray welding integrated structure, which comprises an upper bush and a lower bush, a first stellite alloy bush and a second stellite alloy bush are respectively spray-welded in the upper bush and the lower bush, and a valve cover is sleeved on the surfaces of the upper bush and the lower bush. The valve cover is clamped by the upper lining and the lower lining, the sealing ring is installed on the right side face of the valve cover, the valve rod is inserted into the first stellite alloy lining and the second stellite alloy lining, the right end of the valve rod is provided with a connecting part, the surface of the connecting part is sleeved with the main steam valve disc check ring, and the surface of the main steam valve disc check ring is sleeved with the main steam valve disc clamping ring. According to the speed regulating valve bushing of the steam turbine, the contact area is increased through the sliding grooves and the sliding blocks, falling caused by vibration is prevented, weak links of the valve rod are eliminated, the service life of the valve rod is prolonged, the service life of the valve rod is prolonged, and the service life of the valve rod is prolonged. And the risk that the valve rod falls off and is broken due to high-frequency vibration of the high-pressure speed regulation valve is thoroughly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine valves, in particular to a steam turbine speed regulating valve bushing with a spray-welded integrated structure. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam-powered device that utilizes high-temperature, high-pressure steam as its power source. Its operating principle is that steam is decompressed, accelerated, and directed through a nozzle chamber before being ejected onto blades, which rotate the rotor equipped with rows of blades, thereby converting the steam's thermal energy into mechanical energy. Steam turbines are widely used in the fields of electricity, shipbuilding, chemical engineering, petroleum, and metallurgy. They are a staple of modern thermal power plants and are also used in the metallurgical and chemical industries, as well as in ship propulsion systems.

[0003] A search revealed that application number 201520152870.0, which discloses a "speed regulating valve for a steam turbine," includes an oil motor, a cross sleeve, and a valve stem. The upper end of the cross sleeve is connected to the oil motor, and the lower end is connected to the valve stem. In the original structure, the valve stem extends into the lower end of the cross sleeve and is threaded into the cross sleeve. Once the valve stem is in place, a 22mm diameter pin passes through the cross sleeve and compresses the valve stem perpendicularly to the stem to prevent it from loosening. This structure reduces the diameter of the valve stem at the pin, reducing the strength of the connection and creating a weak link. Under long-term alternating stress, this is the first place to break, and valve stem detachment often occurs.

[0004] Therefore, it is necessary to propose a valve device for a steam turbine to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a turbine speed regulating valve bushing with a spray-welded integrated structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A turbine speed regulating valve bushing with a spray-welded integrated structure comprises an upper bushing and a lower bushing, wherein a first Stellite alloy bushing and a second Stellite alloy bushing are spray-welded inside the upper bushing and the lower bushing respectively, and valve covers are sleeved on the surfaces of the upper bushing and the lower bushing, and the valve covers are clamped by the upper bushing and the lower bushing, and a sealing ring is installed on the right side of the valve cover, and valve stems are inserted into the first and second Stellite alloy bushings, and the right end of the valve stem has a connecting portion, and a main steam valve disc stop ring is sleeved on the surface of the connecting portion, and a main steam valve disc retaining ring is sleeved on the surface of the main steam valve disc stop ring, and the main steam valve disc retaining ring is sealed to the inner wall of the sealing ring.

[0008] Furthermore, a third Stellite alloy bushing is spray-welded on the inner surface of the main steam valve disc stop ring.

[0009] Furthermore, a ring groove is provided on the surface of the connecting portion, a regulating valve guide pin is provided inside the ring groove, the inner wall of the main steam valve disc stop is arranged in a stepped shape, and the main steam valve disc stop ring is sleeved on the surface of the regulating valve guide pin.

[0010] Furthermore, a sealing ring is sleeved on the surface of the valve stem, and the sealing ring is pressed against the right end of the lower bushing.

[0011] Furthermore, a sealing sleeve is provided on the inner wall of the sealing ring, and the sealing sleeve is sleeved on the surface of the main steam valve disc clamping ring.

[0012] Furthermore, a sliding groove is provided on the surface of the valve stem, and a fixing hole penetrating the valve stem is provided on one side of the sliding groove. A fixing mechanism is installed in the fixing hole, and the fixing mechanism includes a fixing rod installed in the fixing hole, and telescopic rods are respectively installed at the head end and the tail end of the fixing rod, and a spring is installed inside the telescopic rod.

[0013] Furthermore, sliders are provided inside the upper bushing and the lower bushing.

[0014] Compared with the prior art, the technical effects and advantages of the present invention are as follows: the present invention provides that the first Stellite alloy bushing is integrally spray-welded on the inner wall of the upper bushing, the second Stellite alloy bushing is integrally spray-welded on the inner wall of the lower bushing, and the third Stellite alloy bushing is integrally spray-welded on the inner wall of the main steam valve disc retaining ring, thereby enhancing the bonding strength of the Stellite alloy, preventing the upper bushing and the lower bushing from deforming, preventing the Stellite alloy from falling off and causing the valve to become stuck, ensuring stable operation of the turbine, and reducing the failure rate of the turbine. The contact area is also increased by the slide groove and the slider to prevent falling off due to vibration, and the weak link of the valve stem is eliminated, completely reducing the risk of the valve stem falling off and breaking due to the high-frequency vibration of the high-pressure speed regulating valve. Facts have proved that this connection method is reliable, durable and effective. At the same time, this connection method is also applicable to other mechanical equipment with high-frequency vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of the overall assembly of this utility;

[0016] Figure 2 This is a schematic diagram of the disassembly of the valve cover, valve stem, main steam valve disc retaining ring and other components of the utility model;

[0017] Figure 3 This is a view of the telescopic rod of the utility model;

[0018] Figure 4 For this utility model Figure 1 A in the middle is an enlarged schematic diagram;

[0019] In the figure: 1. Upper bushing; 2. Lower bushing; 3. Valve cover; 4. Valve stem; 5. Main steam valve disc retaining ring; 6. Main steam valve disc stop ring; 7. Control valve guide pin; 8. Sealing ring; 9. Connecting part; 10. First Stellite alloy bushing; 11. Second Stellite alloy bushing; 14. Sealing ring; 15. Sealing sleeve; 16. Third Stellite alloy bushing; 17. Slide groove; 18. Slider; 19. Fixing hole; 201. Fixing rod; 202. Telescopic rod; 203. Spring. DETAILED DESCRIPTION

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

[0021] In the description of the present invention, it should be noted that the terms "upper end", "lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end", etc., indicating the orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "sleeved," "socketed," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] See also Figures 1 to 4 , the utility model provides a technical solution:

[0024] A turbine speed regulating valve bushing with a spray-welded integrated structure comprises an upper bushing 1 and a lower bushing 2, wherein a first Stellite alloy bushing 10 and a second Stellite alloy bushing 11 are spray-welded inside the upper bushing 1 and the lower bushing 2 respectively, a valve cover 3 is sleeved on the surface of the upper bushing 1 and the lower bushing 2, the valve cover 3 is clamped by the upper bushing 1 and the lower bushing, a sealing ring 8 is installed on the right side of the valve cover 3, a valve stem 4 is inserted into the first and second Stellite alloy bushings 10 and 11, the right end of the valve stem 4 has a connecting portion 9, a main steam valve disc stop ring 6 is sleeved on the surface of the connecting portion 9, a main steam valve disc retaining ring 5 is sleeved on the surface of the main steam valve disc stop ring 6, and the main steam valve disc retaining ring 5 is sealed to the inner wall of the sealing ring 8.

[0025] In the specific implementation process, Figure 2 As shown, a third Stellite alloy bushing 16 is spray-welded on the inner surface of the main steam valve disc stop ring 6 .

[0026] It should be noted that a third Stellite alloy bushing 16 is spray-welded on the inner surface of the main steam valve disc stop ring 6 to improve the structural strength of the main steam valve disc stop ring 6 .

[0027] In the specific implementation process, Figure 1 As shown, a ring groove is provided on the surface of the connecting portion 9, a regulating valve guide pin 7 is provided inside the ring groove, the inner wall of the main steam valve disc stop is stepped, and the main steam valve disc stop ring 6 is sleeved on the surface of the regulating valve guide pin 7.

[0028] It should be noted that an annular groove is provided on the surface of the connecting portion 9, a regulating valve guide pin 7 is provided inside the annular groove, the inner wall of the main steam valve disc stop is stepped, and the main steam valve disc stop ring 6 is sleeved on the surface of the regulating valve guide pin 7. The regulating valve guide pin 7 is also made of GH901 high-temperature alloy, which is not easy to deform when used at high temperature and has a stable guiding effect.

[0029] In the specific implementation process, Figure 1 As shown, a sealing ring 14 is sleeved on the surface of the valve stem 4, and the sealing ring 14 is pressed against the right end of the lower bushing 2.

[0030] It should be noted that a sealing ring 14 is sleeved on the surface of the valve stem 4, and the sealing ring 14 is pressed against the right end of the lower bushing 2 to strengthen the sealing effect on the lower bushing 2 and to scrape off some impurities.

[0031] In the specific implementation process, Figure 1 As shown, a sealing sleeve 15 is provided on the inner wall of the sealing ring 8 , and the sealing sleeve 15 is sleeved on the surface of the main steam valve disc retaining ring 5 .

[0032] It should be noted that the inner wall of the sealing ring 8 is provided with a sealing sleeve 15, which is sleeved on the surface of the main steam valve disc retaining ring 5 to prevent steam leakage. The sealing sleeve 15 is fixed with a hexagon socket screw and can be replaced.

[0033] In the specific implementation process, Figure 1 As shown, a slide groove 17 is provided on the surface of the valve stem 4, and a fixing hole 19 is provided on one side of the slide groove 17 and passes through the valve stem 4. A fixing mechanism 20 is installed in the fixing hole 19, and the fixing mechanism 20 includes a fixing rod 201 installed in the fixing hole 19, and a telescopic rod 202 is installed at the head end and the tail end of the fixing rod 201 respectively, and a spring 203 is installed inside the telescopic rod 202.

[0034] It should be noted that a slide groove 17 is provided on the surface of the valve stem 4, and a fixing hole 19 that passes through the valve stem 4 is provided on one side of the slide groove 17. A fixing mechanism 20 is installed in the fixing hole 19, and the fixing mechanism 20 includes a fixing rod 201 installed in the fixing hole 19, and telescopic rods 202 are respectively installed at the head and tail ends of the fixing rod 201, and a spring 203 is installed inside the telescopic rod 202. The contact area is increased through the movement of the slide groove 17 and the slider 18 to prevent falling off due to vibration, and eliminate the weak link of the valve stem 4, completely reducing the risk of the valve stem 4 falling off or breaking due to high-frequency vibration of the high-pressure speed regulating valve. After the upper bushing 1 and the lower bushing 2 are installed, the upper bushing 1 and the lower bushing 2 are prevented from falling off, and the telescopic rod 202 and the spring 203 above the fixing rod 201 play a fixing role.

[0035] In the specific implementation process, Figure 1 As shown, sliders 18 are provided inside the upper bushing 1 and the lower bushing 2 .

[0036] It should be noted that a slider 18 is provided inside the upper bushing 1 and the lower bushing 2 , and the slider 18 is slidably connected to the slide groove 17 .

[0037] The working principle of this embodiment is as follows: When in use, the upper bushing 1 and the lower bushing 2 are spray-welded, so that the first Stellite alloy bushing 10 and the second Stellite alloy bushing 11 are an integrated structure, and the valve stem 4 moves in the first Stellite alloy bushing 10 and the second Stellite alloy bushing 11, which is not easily damaged. The sealing ring 8 and the main steam valve disc retaining ring 5 use a sealing sleeve 15 to enhance the sealing performance, and the sealing sleeve 15 is a replaceable design for easy maintenance. The upper bushing 1, the lower bushing 2, and the sealing ring 8 are made of F92 alloy steel, and the main steam valve disc The retaining ring 6 is made of F91 steel paper, and the regulating valve guide pin 7 and the main steam valve disc retaining ring 5 are made of GH901 high-temperature alloy. The turbine medium-pressure combined steam valve is optimized in terms of material and structure. The contact area is increased through the movement of the slide groove 17 and the slider 18 to prevent it from falling off due to vibration, and the weak link of the valve stem 4 is eliminated, which completely reduces the risk of the valve stem 4 falling off and breaking due to the high-frequency vibration of the high-pressure speed regulating valve. After installing the upper bushing 1 and the lower bushing 2, the upper bushing 1 and the lower bushing 2 are prevented from falling off, and the telescopic rod 202 and the spring 203 above the fixing rod 201 play a fixing role.

[0038] The remaining parts not described in this utility model are existing or well-known technologies.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine speed regulating valve bushing with a spray-welded integrated structure, characterized in that: The invention comprises an upper bushing (1) and a lower bushing (2), wherein a first Stellite alloy bushing (10) and a second Stellite alloy bushing (11) are spray-welded inside the upper bushing (1) and the lower bushing (2), respectively, a valve cover (3) is sleeved on the surface of the upper bushing (1) and the lower bushing (2), the valve cover (3) is clamped by the upper bushing (1) and the lower bushing, a sealing ring (8) is installed on the right side of the valve cover (3), a valve stem (4) is inserted into the interior of the first Stellite alloy bushing (10) and the second Stellite alloy bushing (11), the right end of the valve stem (4) is provided with a connecting portion (9), a main steam valve disc stop ring (6) is sleeved on the surface of the connecting portion (9), a main steam valve disc retaining ring (5) is sleeved on the surface of the main steam valve disc stop ring (6), and the main steam valve disc retaining ring (5) is sealed and connected to the inner wall of the sealing ring (8); A third Stellite alloy bushing (16) is spray-welded on the inner surface of the main steam valve disc stop ring (6); The surface of the connecting portion (9) is provided with an annular groove, a regulating valve guide pin (7) is provided inside the annular groove, the inner wall of the main steam valve disc stopper is arranged in a stepped shape, and the main steam valve disc stopper ring (6) is sleeved on the surface of the regulating valve guide pin (7); A sliding groove (17) is provided on the surface of the valve stem (4), a fixing hole (19) penetrating the valve stem (4) is provided on one side of the sliding groove (17), a fixing mechanism (20) is installed in the fixing hole (19), and the fixing mechanism (20) includes a fixing rod (201) installed in the fixing hole (19), a telescopic rod (202) is installed at the front end and the rear end of the fixing rod (201), and a spring (203) is installed inside the telescopic rod (202); Slide blocks (18) are provided inside the upper bushing (1) and the lower bushing (2).

2. The steam turbine speed regulating valve bushing with a spray-welded integrated structure according to claim 1, characterized in that: A sealing ring (14) is sleeved on the surface of the valve stem (4), and the sealing ring (14) is pressed against the right end of the lower bushing (2).

3. The steam turbine speed regulating valve bushing with a spray-welded integrated structure according to claim 1, characterized in that: The inner wall of the sealing ring (8) is provided with a sealing sleeve (15), and the sealing sleeve (15) is sleeved on the surface of the main steam valve disc clamping ring (5).

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