Valve rod connecting structure

Abstract

The invention provides a valve rod connecting structure which comprises a valve rod, a ball head, a connecting nut, a connecting pin and a locking screw, the valve rod is provided with a connecting pin mounting part, a threaded part and a ball head mounting step from top to bottom, and the connecting pin mounting part is provided with a first connecting pin mounting groove; the ball head sequentially penetrates through the connecting pin mounting part and the threaded part and then is arranged on the ball head mounting step, the connecting nut is mounted on the threaded part and used for locking the ball head, a second connecting pin mounting groove corresponding to the first connecting pin mounting groove is formed in the top of the connecting nut, and the connecting pin is mounted in the first connecting pin mounting groove. The two ends of the connecting pin are located in the second connecting pin mounting groove, and the connecting pin and the bottom face of the first connecting pin mounting groove are connected and fixed through a locking screw. The valve rod connecting structure provided by the invention is reasonable in structure, effectively improves the capability of bearing stress impact, and further improves the operation reliability of equipment.

Description

Technical Field

[0001] This invention relates to the field of steam turbine valve technology, and in particular to a valve stem connection structure. Background Technology

[0002] Currently, in the operation of large-capacity steam turbine units used in power plants, the valve stem connection assembly is subjected to stress impacts from high parameters and varying operating conditions. Because the existing valve stem and the screw-in ball head are directly connected by a connecting pin, the connecting pin is prone to breakage and the thread of the connecting nut is damaged, causing the connection assembly to detach from the valve stem. This makes it impossible to guarantee the normal opening and closing of the valve, seriously threatening the safe operation of the unit. Summary of the Invention

[0003] The purpose of this invention is to provide a valve stem connection structure that solves the problem of valves failing to open and close properly due to broken valve stem connecting pins.

[0004] This invention provides a valve stem connection structure, including a valve stem, a ball head, a connecting nut, a connecting pin, and a locking screw. The valve stem has a connecting pin mounting portion, a threaded portion, and a ball head mounting step from top to bottom. The connecting pin mounting portion has a first connecting pin mounting groove. The ball head passes through the connecting pin mounting portion and the threaded portion in sequence and is then positioned on the ball head mounting step. The connecting nut is installed on the threaded portion to lock the ball head. A second connecting pin mounting groove corresponding to the first connecting pin mounting groove is provided on the top of the connecting nut. The connecting pin is installed in the first connecting pin mounting groove, and both ends of the connecting pin are located in the second connecting pin mounting groove. The connecting pin is connected and fixed to the bottom surface of the first connecting pin mounting groove by the locking screw.

[0005] According to the valve stem connection structure provided by the present invention, the connecting pin includes a circular portion and extension portions symmetrically arranged on opposite sides of the circular portion.

[0006] According to the valve stem connection structure provided by the present invention, a central through hole is provided at the center of the circular portion.

[0007] According to the valve stem connection structure provided by the present invention, the first connecting pin mounting groove is disposed at the top end of the connecting pin mounting portion, and the first connecting pin mounting groove includes a circular groove adapted to the circular portion and an extension groove adapted to the two extension portions.

[0008] According to the valve stem connection structure provided by the present invention, a central threaded hole is provided at the center of the bottom of the circular groove, and the locking screw passes through the central through hole and is threadedly connected to the central threaded hole.

[0009] According to the valve stem connection structure provided by the present invention, the second connecting pin mounting grooves are respectively opened on opposite sides of the top of the connecting nut, and the two second connecting pin mounting grooves are respectively connected to the two extension grooves.

[0010] According to the valve stem connection structure provided by the present invention, the connecting pin is made of steel plate of equal thickness.

[0011] According to the valve stem connection structure provided by the present invention, the valve stem, the ball head, the connecting nut and the locking screw are all made of steel.

[0012] The valve stem connection structure provided by this invention comprises a connecting pin mounting portion, a threaded portion, and a ball head mounting step, arranged from top to bottom on the valve stem. A first connecting pin mounting groove is provided in the connecting pin mounting portion. The ball head passes through the connecting pin mounting portion and the threaded portion sequentially and is then positioned on the ball head mounting step. A connecting nut is installed on the threaded portion to lock the ball head. A second connecting pin mounting groove, corresponding to the first connecting pin mounting groove, is provided on the top of the connecting nut. The connecting pin is installed in the first connecting pin mounting groove, with both ends of the connecting pin located in the second connecting pin mounting groove. Finally, the connecting pin and the bottom surface of the first connecting pin mounting groove are connected and fixed using a locking screw. Therefore, the valve stem connection structure provided by this invention has a reasonable structure. Through the cooperation between the valve stem, connecting nut, and connecting pin, a stable connection is achieved between the valve stem and the ball head, as well as between the valve stem and the connecting nut. This effectively improves the valve stem connection structure's ability to withstand stress impacts, ensures the normal opening and closing adjustment of the valve, and thus improves the operational reliability of the turbine unit. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a front view of the valve stem connection structure of the present invention; Figure 2 This is a top view of the valve stem connection structure of the present invention; Figure 3 This is a schematic diagram of the connecting pin in the valve stem connection structure of the present invention; Figure 4 This is a front view of the valve stem in the valve stem connection structure of the present invention; Figure 5 This is a top view of the valve stem in the valve stem connection structure of the present invention; Figure 6 This is a top view of the valve stem and connecting pin after installation in the valve stem connection structure of the present invention; Figure 7 This is a front view of the connecting nut in the valve stem connection structure of the present invention; Figure 8 This is a top view of the connecting nut in the valve stem connection structure of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Valve stem; 101. Connecting pin mounting part; 102. Threaded part; 103. Ball head mounting step; 104. First connecting pin mounting groove; 1041. Circular groove; 1042. Extension groove; 1043. Center threaded hole; 2. Ball head; 3. Connecting nut; 301. Second connecting pin mounting slot; 4. Connecting pin; 401. Circular part; 402. Extension part; 403. Central through hole; 5. Locking screws. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] like Figures 1 to 8 As shown, the valve stem connection structure of this embodiment includes a valve stem 1, a ball head 2, a connecting nut 3, a connecting pin 4, and a locking screw 5. The upper part of the valve stem 1 is provided with a connecting pin mounting part 101, a threaded part 102, and a ball head mounting step 103 from top to bottom. The connecting pin mounting part 101 is provided with a first connecting pin mounting groove 104. The ball head 2 passes through the connecting pin mounting part 101 and the threaded part 102 in sequence and is then placed on the ball head mounting step 103. The connecting nut 3 is threaded onto the threaded part 102 to lock the ball head 2. A second connecting pin mounting groove 301 corresponding to the first connecting pin mounting groove 104 is provided on the top of the connecting nut 3. The connecting pin 4 is installed in the first connecting pin mounting groove 104, and both ends of the connecting pin 4 are located in the second connecting pin mounting groove 301. The connecting pin 4 and the bottom surface of the first connecting pin mounting groove 104 are connected and fixed by the locking screw 5.

[0020] When installing the valve stem, since ball head 2 needs to be installed between the upper and lower flanges, and then the upper flange is connected to the piston rod of the hydraulic actuator, a stable connection between the valve stem and the piston rod of the hydraulic actuator is achieved. Therefore, the installation sequence is as follows: First, install the lower flange onto the valve stem 1 from the top. Then, install the ball head 2 and connecting nut 3 onto the valve stem 1 in sequence, locking the ball head 2 with the connecting nut 3. Next, create a second connecting pin mounting groove 301 on the top of the connecting nut 3, corresponding to the first connecting pin mounting groove 104. Then, install the connecting pin 4 into the first connecting pin mounting groove 104 and the second connecting pin mounting groove 301, and finally lock the connecting pin 4 to the valve stem 1 with the locking screw 5. After that, install the upper flange onto the valve stem 1 from the top. Then, connect and fix the upper flange to the lower flange with bolts, and finally, connect and fix the upper flange to the piston rod of the hydraulic actuator with bolts.

[0021] Therefore, the valve stem connection structure of this embodiment of the invention has a reasonable structure. Through the cooperation between the valve stem 1, the connecting nut 3 and the connecting pin 4, a stable connection between the valve stem 1 and the ball head 2 and between the valve stem 1 and the connecting nut 3 is achieved. This effectively improves the ability of the valve stem connection structure to withstand stress impact, ensures the normal opening and closing adjustment of the steam valve, and thus improves the operational reliability of the steam turbine unit.

[0022] In some embodiments of the present invention, the connecting pin 4 includes a circular portion 401 and extension portions 402 symmetrically disposed on opposite sides of the circular portion 401. A central through hole 403 is provided at the center of the circular portion 401.

[0023] Specifically, the first connecting pin mounting groove 104 is disposed at the top of the connecting pin mounting part 101. The first connecting pin mounting groove 104 includes a circular groove 1041 adapted to the circular part 401 and an extension groove 1042 adapted to the two extension parts 402, for realizing reliable installation and positioning of the connecting pin 4.

[0024] A central threaded hole 1043 is provided at the center of the bottom of the circular groove 1041. The locking screw 5 passes through the central through hole 403 and is threaded into the central threaded hole 1043, thereby achieving reliable fixation of the connecting pin 4 in the first connecting pin mounting groove 104.

[0025] Specifically, the second connecting pin mounting grooves 301 are respectively formed on opposite sides of the top of the connecting nut 3, and the two extension grooves 1042 on each side of the second connecting pin mounting grooves 301 are connected to each other to adapt to the extensions 402 on both sides of the connecting pin 4. When the connecting pin 4 is connected and fixed to the connecting pin mounting part 101 of the valve stem 1 by the locking screw 5, the limiting effect of the extensions 402 on both sides of the connecting pin 4 on the connecting nut 3 can improve the stability and reliability of the connecting nut 3 and the valve stem 1 after installation.

[0026] Specifically, the connecting pin 4 is made of steel plate of uniform thickness. The dimensions of the connecting pin 4 can be set according to actual usage requirements. For example, in one specific embodiment, the overall length of the connecting pin 4 is set to 65mm, the thickness of the connecting pin 4 is set to 15mm, the outer diameter of the circular part 401 is set to 20mm, and the diameter of the central through hole 403 is set to 8mm.

[0027] Specifically, the valve stem 1, ball head 2, connecting nut 3, and locking screw 5 are all made of steel.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve stem connection structure, characterized in that, The valve includes a valve stem, a ball head, a connecting nut, a connecting pin, and a locking screw. The valve stem has a connecting pin mounting portion, a threaded portion, and a ball head mounting step from top to bottom. The connecting pin mounting portion has a first connecting pin mounting groove. The ball head passes through the connecting pin mounting portion and the threaded portion in sequence and is then positioned on the ball head mounting step. The connecting nut is installed on the threaded portion to lock the ball head. The top of the connecting nut has a second connecting pin mounting groove corresponding to the first connecting pin mounting groove. The connecting pin is installed in the first connecting pin mounting groove, and both ends of the connecting pin are located in the second connecting pin mounting groove. The connecting pin is connected and fixed to the bottom surface of the first connecting pin mounting groove by the locking screw.

2. The valve stem connection structure according to claim 1, characterized in that, The connecting pin includes a circular portion and extension portions symmetrically arranged on opposite sides of the circular portion.

3. The valve stem connection structure according to claim 2, characterized in that, A central through hole is provided at the center of the circular portion.

4. The valve stem connection structure according to claim 3, characterized in that, The first connecting pin mounting groove is disposed at the top of the connecting pin mounting part. The first connecting pin mounting groove includes a circular groove that matches the circular part and an extension groove that matches the two extension parts.

5. The valve stem connection structure according to claim 4, characterized in that, A central threaded hole is provided at the bottom center of the circular groove, and the locking screw passes through the central through hole and is threaded into the central threaded hole.

6. The valve stem connection structure according to claim 4, characterized in that, The second connecting pin mounting grooves are respectively opened on opposite sides of the top of the connecting nut, and the two second connecting pin mounting grooves are respectively connected to the two extension grooves.

7. The valve stem connection structure according to any one of claims 1 to 6, characterized in that, The connecting pin is made of steel plate of uniform thickness.

8. The valve stem connection structure according to any one of claims 1 to 6, characterized in that, The valve stem, the ball head, the connecting nut, and the locking screw are all made of steel.

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