High-pressure regulating valve of steam turbine

Abstract

The utility model relates to the technical field of steam turbines, in particular to a steam turbine high-pressure adjusting valve which comprises a valve rod, the outer side of the valve rod is in threaded connection with a connecting sleeve, and the valve rod is connected with the connecting sleeve through a pin. The valve rod comprises a main shaft and an end shaft coaxially and fixedly connected to the end of the main shaft, and the diameter of the end shaft is smaller than that of the main shaft. The bottom of the end shaft is sleeved with a positioning sleeve, and the top of the end shaft is in threaded connection with a nut. The connecting sleeve is positioned between the positioning sleeve and the nut; by arranging the end shafts, the positioning sleeves and the nuts, connection between the valve rod and the connecting sleeve can be reinforced through the positioning sleeves and the nuts at the two ends of the connecting sleeve on the basis of threaded connection and pin connection, and separation of the valve rod and the connecting sleeve is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine technical field, specifically a steam turbine high pressure governing valve. BACKGROUND

[0002] The high pressure governing valve is an important component in the steam turbine control system, mainly used for controlling the rotating speed and output power of the steam turbine; the high pressure governing valve internally comprises a valve rod, one end of the valve rod is connected with a valve core, the other end is connected with an oil motor, used for transmitting thrust to realize the movement of the valve core, thereby adjusting the opening of the valve; the end of the valve rod is fixedly connected with a connecting sleeve through threads and a pin, and is fixedly connected with the oil motor through the connecting sleeve; the valve rod is prone to falling off between the connecting sleeve under high-frequency vibration impact during normal operation, causing the damage of the valve. SUMMARY

[0003] The utility model discloses a steam turbine high pressure governing valve, which solves the problem of the valve rod of the high pressure governing valve falling off between the connecting sleeve under high-frequency vibration impact during normal operation in the prior art, causing the damage of the valve.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a steam turbine high pressure governing valve, which comprises a valve rod, a connecting sleeve is connected with the outer side of the valve rod through threads, and the valve rod and the connecting sleeve are connected through a pin; the valve rod comprises a main shaft and an end shaft fixedly connected with the end of the main shaft, and the diameter of the end shaft is smaller than that of the main shaft; a positioning sleeve is sleeved with the outer side of the bottom of the end shaft, and a nut is connected with the top of the end shaft through threads; the connecting sleeve is located between the positioning sleeve and the nut.

[0005] Further, one end of the main shaft close to the end shaft is provided with an outer chamfer, and the bottom of the positioning sleeve is provided with an inner chamfer matched with the outer chamfer.

[0006] Further, the outer side of the connecting sleeve is provided with external threads.

[0007] Further, the outer side of the connecting sleeve is provided with an auxiliary rotating hole.

[0008] The utility model discloses a steam turbine high pressure governing valve, which solves the problem of the valve rod of the high pressure governing valve falling off between the connecting sleeve under high-frequency vibration impact during normal operation in the prior art, causing the damage of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0009] The drawings accompanying the specification provide further understanding of the utility model, and the schematic embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0010] Figure 1This is a schematic diagram of the high-pressure regulating valve of the steam turbine in the embodiment;

[0011] Figure 2 This is a schematic diagram of the high-pressure regulating valve of the steam turbine in the embodiment;

[0012] In the diagram: 1. Valve stem; 101. Main shaft; 102. End shaft; 103. External chamfer; 2. Connecting sleeve; 201. External thread; 3. Pin; 4. Positioning sleeve; 5. Nut; 6. Auxiliary rotation hole. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] like Figure 2 As shown, a conventional high-pressure regulating valve for a steam turbine includes a valve stem 1 and a connecting sleeve 2. The connecting sleeve 2 is threaded onto the top outer side of the valve stem 1, and the valve stem 1 and the connecting sleeve 2 are connected by a pin 3. During normal operation, the valve stem 1 is subject to high-frequency vibration and impact, which can easily cause it to detach from the connecting sleeve, resulting in damage to the valve.

[0015] like Figure 1 As shown, according to an embodiment of this utility model, a high-pressure regulating steam valve for a steam turbine is provided, including a valve stem 1, a connecting sleeve 2 threadedly connected to the outer side of the valve stem 1, and the valve stem 1 and the connecting sleeve 2 connected by a pin 3; the valve stem 1 includes a main shaft 101 and an end shaft 102 coaxially fixedly connected to the end of the main shaft 101, the diameter of the end shaft 102 being smaller than the diameter of the main shaft 101; a positioning sleeve 4 is sleeved on the outer side of the bottom of the end shaft 102, and a nut 5 is threadedly connected to the top of the end shaft 102; the connecting sleeve 2 is located between the positioning sleeve 4 and the nut 5; the positioning sleeve 4 and the nut 5 limit the movement of the connecting sleeve 2.

[0016] The main spindle 101 has an outer chamfer 103 at one end near the end shaft 102, and the bottom of the positioning sleeve 4 has an inner chamfer that matches the outer chamfer.

[0017] The outer side of the connecting sleeve 2 is provided with an external thread 201; the external thread 201 is used when the connecting sleeve 2 and the piston rod of the hydraulic actuator are connected and fixed.

[0018] An auxiliary rotation hole 6 is provided on the outer side of the connecting sleeve 2; when the connecting sleeve 2 is rotated, a plug rod is inserted into the connecting sleeve 2 to assist in the rotation.

[0019] In this embodiment, by setting the end shaft 102, positioning sleeve 4, and nut 5, the connection between valve stem 1 and connecting sleeve 2 can be strengthened by the positioning sleeve 4 and nut 5 at both ends of the connecting sleeve 2, based on the threaded connection and pin connection. During normal operation, when valve stem 1 is subjected to high-frequency vibration impact, valve stem 1 and connecting sleeve 2 are prevented from separating.

[0020] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A valve for a high-pressure control valve of a steam turbine, comprising a valve stem (1), a connecting sleeve (2) is externally threaded connected to the valve stem (1), the valve stem (1) and the connecting sleeve (2) are connected by a pin (3); characterized in that, The valve stem (1) comprises a main shaft (101) and an end shaft (102) coaxially fixedly connected at the end of the main shaft (101), the diameter of the end shaft (102) is smaller than that of the main shaft (101); the bottom outer side of the end shaft (102) is sleeved with a positioning sleeve (4), and the top of the end shaft (102) is threadedly connected with a nut (5); the connecting sleeve (2) is located between the positioning sleeve (4) and the nut (5).

2. The steam turbine high pressure control valve of claim 1, wherein, The main shaft (101) is provided with an outer chamfer (103) at one end close to the end shaft (102), and the bottom of the positioning sleeve (4) is provided with an inner chamfer matched with the outer chamfer (103).

3. The steam turbine high pressure control valve of claim 1, wherein, The outer side of the connecting sleeve (2) is provided with an outer thread (201).

4. The steam turbine high pressure control valve of claim 1, wherein, The outer side of the connecting sleeve (2) is provided with an auxiliary rotating hole (6).

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