A valve core and valve rod anti-loose connection structure

Abstract

The utility model discloses a valve core valve rod anti -loose connection structure, including the valve core, the center of which is equipped with the first center hole and the second center hole of intercommunication, is provided with the first internal thread on the inner wall of first center hole, is provided with the second internal thread on the inner wall of second center hole, and the rotation direction of first internal thread is opposite with the rotation direction of second internal thread, the valve rod is sleeved in the valve core, and including coaxial and fixed connection's first rod body and second rod body, is provided with the second external thread on the outer wall of second rod body, and the second external thread is connected with second internal thread cooperation, the lock nut is sleeved in the first rod body outside, and the bottom portion of its and the top portion of second rod body abuts, is provided with the first external thread on its outer wall, and the first external thread is connected with first internal thread cooperation, the utility model sets up the interlock setting of positive and negative thread, improves its anti -loose performance, improves the anti -loose reliability, and mechanical anti -loose structure and welding fixed two groups of anti -loose mode are combined, form double protection, improve the anti -loose effect.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve core and valve stem anti-loosening connection structure. Background Technology

[0002] Valves are critical actuators in fluid control systems, and their reliability directly affects the safety of the entire system. The connection between the valve core and the valve stem is the core transmission part of the valve. If it becomes loose, it can lead to internal leakage, control failure, and even serious safety accidents.

[0003] In existing technologies, valve cores and valve stems are mostly connected by simple threads, supplemented by anti-loosening measures such as set screws, lock screws, and pins. For example, in the slide valve type minimum flow valve and descaling valve used in high-pressure water descaling systems in the metallurgical industry, the traditional method of connecting the valve core and valve stem is as follows: a threaded hole is machined on the valve core, and after tightening it with the valve stem, a tapered pin hole is drilled on the outer circumference of the valve core. The tapered pin is then riveted into the valve core and valve stem to prevent loosening. However, the above connection method has the following problems: (1) Using a tapered pin can improve the connection strength between the valve core and the valve stem, but its anti-loosening reliability is insufficient under long-term and strong vibration and impact conditions; if a set screw or anti-loosening screw is used for anti-loosening, the screw itself is prone to loosening under vibration environment, and there is also a problem of insufficient anti-loosening reliability. (2) Existing valves use a single anti-loosening structure (such as a conical pin). Under extreme vibration conditions, the single anti-loosening structure may fail, making it difficult to ensure long-term stable operation and resulting in low reliability. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a valve core and valve stem anti-loosening connection structure with interlocking positive and negative threads to improve its anti-loosening performance and reliability. Furthermore, the combination of mechanical anti-loosening structure and welding fixation as two anti-loosening methods forms a double guarantee and improves the anti-loosening effect.

[0005] This utility model provides a valve core and valve stem anti-loosening connection structure, comprising: The valve core has a first central hole and a second central hole that are coaxially connected along its axis. The inner wall of the first central hole is provided with a first internal thread, and the inner wall of the second central hole is provided with a second internal thread. The direction of rotation of the first internal thread is opposite to that of the second internal thread. The valve stem is sleeved in the first central hole and the second central hole of the valve core, and includes a first rod body and a second rod body that are coaxial and fixedly connected. The diameter of the first rod body is smaller than the diameter of the second rod body. A second external thread is provided on the outer wall of the second rod body, and the second external thread is engaged with the second internal thread. A locking nut is sleeved on the body of the first rod, with its end face near the second rod abutting against the end face of the second rod. A first external thread is provided on its outer wall, and the first external thread is engaged with the first internal thread.

[0006] Furthermore, the first central hole is located above the second central hole, and its diameter is larger than that of the second central hole. The first rod is inserted into the first central hole, and the second rod is inserted into the second central hole.

[0007] Furthermore, the locking nut has a third central hole along its axial direction, the first rod passes through the third central hole, and the bottom of the locking nut is provided with a first conical surface at the lower end of the third central hole. The first conical surface has a conical structure that is larger at the top and smaller at the bottom, and the top of the second rod is provided with a second conical surface that matches the first conical surface.

[0008] Furthermore, a positioning hole is also provided at the center of the valve core along its axial direction. The positioning hole is coaxially disposed below the second central hole and communicates with the second central hole. The diameter of the positioning hole is smaller than the diameter of the second central hole. The bottom of the second rod is coaxially and fixedly connected to a positioning shaft, and the bottom of the positioning shaft is welded and fixed to the valve core.

[0009] Furthermore, the top of the valve core is provided with a first welding bevel at the upper port of the first central hole, and the top of the locking nut is provided with a second welding bevel along its outer edge. The valve core and the locking nut are welded and fixed together by the first welding bevel and the second welding bevel.

[0010] Furthermore, the bevel angle of the first welding groove is 45°-50°, and the bevel angle of the second welding groove is 45°-50°.

[0011] Compared with the prior art, the beneficial effects of this utility model are: (1) The valve core of this utility model has a first central hole and a second central hole that are interconnected along its axial direction. The inner wall of the first central hole is provided with a first internal thread, and the inner wall of the second central hole is provided with a second internal thread. The valve stem is sleeved inside the valve core. The outer wall of the second rod of the valve stem is provided with a second external thread. The second external thread and the second internal thread on the valve core are engaged to achieve the initial fastening connection between the valve stem and the valve core. The locking nut is sleeved outside the first rod of the valve stem, and the outer wall of the locking nut is provided with a first external thread. The first external thread and the first internal thread on the valve core are engaged to achieve the initial fastening connection between the valve stem and the valve core. The locking nut is sleeved outside the first rod of the valve stem, and the outer wall of the locking nut is provided with a first external thread. The first external thread and the first internal thread on the valve core are engaged to achieve the connection between the bottom of the locking nut and the top of the second rod. Since the first internal thread and the second internal thread have opposite directions of rotation, when the valve generates a torque that causes the valve core and the valve stem to loosen during operation, the torque will be converted into a force to tighten the locking nut, thereby forming a mechanical self-locking, effectively preventing the connection from loosening and improving the reliability of the anti-loosening. (2) This utility model adopts a combination of two anti-loosening methods: positive and negative thread mechanical anti-loosening structure and welding fixation, which realizes dual protection against loosening of the connection structure. Compared with a single anti-loosening structure, it further improves the connection stability and anti-loosening reliability. (3) The present invention has a positioning hole coaxially opened in the center of the valve core, and a positioning shaft coaxially and fixedly connected to the bottom of the second rod of the valve stem. When the valve stem is inserted into the valve core, the positioning shaft and the positioning hole on the valve core are fitted with a clearance, which can effectively prevent the valve core and valve stem from being out of axis due to the unbalanced force applied by the plate when the valve core and valve stem are tightened, improve the coaxiality of the assembly, and further improve the assembly accuracy of the product.

[0012] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0013] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the valve core structure in this utility model; Figure 3 This is a schematic diagram of the valve stem structure in this utility model; Figure 4 This is a schematic diagram of the locking nut in this utility model; Labels in the diagram: 1. Valve core; 2. Valve stem; 3. Locking nut; 11. First center hole; 12. Second center hole; 13. Positioning hole; 14. First welding bevel; 21. First rod; 22. Second rod; 23. Positioning shaft; 31. First external thread; 32. First conical surface; 33. Second welding bevel; 221. The second cone surface. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0015] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] Please refer to Figures 1-4 An embodiment of this utility model provides a valve core and valve stem anti-loosening connection structure, comprising: The valve core 1 has a first central hole 11 and a second central hole 12 that are coaxially connected along its axis. The inner wall of the first central hole 11 is provided with a first internal thread, and the inner wall of the second central hole 12 is provided with a second internal thread. The direction of rotation of the first internal thread is opposite to that of the second internal thread. The valve stem 2 is sleeved in the first central hole 11 and the second central hole 12 of the valve core 1. It includes a first rod body 21 and a second rod body 22 that are coaxial and fixedly connected. The diameter of the first rod body 21 is smaller than the diameter of the second rod body 22. The outer wall of the second rod body 22 is provided with a second external thread, which is connected to the second internal thread. The locking nut 3 is sleeved on the outside of the first rod 11, and its end face near the second rod 22 abuts against the end face of the second rod 12. The outer wall of the nut is provided with a first external thread 31, which is connected to the first internal thread.

[0017] In this embodiment, the second internal thread provided on the inner wall of the second central hole 12 of the valve core 1 is a positive internal thread. The valve stem 2 includes a first rod body 21 and a second rod body 22 that are coaxial and fixedly connected. The valve stem 2 is inserted into the valve core 1 from top to bottom. The second external thread on the outer wall of the second rod body 22 is a positive external thread. The positive external thread matches the positive internal thread. The valve core 1 and the valve stem 2 are initially fastened together by tightening. The first internal thread on the inner wall of the first center hole 11 of the valve core 1 is a reverse-rotation internal thread. The locking nut 3 is sleeved on the outside of the first rod body 21 of the valve stem 2. The first external thread 31 on the outer wall of the locking nut 3 is a reverse-rotation external thread, which matches the reverse-rotation internal thread. The locking nut 3 is tightened with a torque wrench so that the bottom of the locking nut 3 abuts against the top of the second rod body 22 of the valve stem 2, thus limiting and fixing the top of the second rod body 22. Since the first internal thread and the second internal thread have opposite rotation directions, when the valve... When a torque is generated during operation that causes the valve core 1 to loosen from the valve stem 2, this torque is converted into a force to tighten the locking nut 3, thereby forming a mechanical self-locking. For example, when the valve core 1 is subjected to vibration and rotates in the opposite direction, the locking nut 3 is further tightened between the valve core 1 and the valve stem 1, and the bottom of the locking nut 3 and the top of the second rod 22 of the valve stem 2 are further tightly abutted, thereby making the valve core 1 and the valve stem 2 securely connected. This application converts the loosening force into a tightening force through the setting of positive and negative threads, effectively preventing the connection from loosening and improving the reliability of the anti-loosening. Furthermore, the locking nut 3 is an independent part, which is easy to process and also easy to achieve the fit between it and the valve core 1 and valve stem 2. It does not require changing the main appearance size of the existing valve. The structure is simple, compact and highly versatile.

[0018] In a preferred embodiment, such as Figure 2 As shown, the first central hole 11 is located above the second central hole 12, and its diameter is larger than that of the second central hole 12. The first rod 21 passes through the first central hole 11, and the second rod 22 passes through the second central hole 12.

[0019] In this embodiment, the first central hole 11 opened in the center of the valve core 1 is located above the second central hole 12, and the diameter of the first central hole 11 is larger than the diameter of the second central hole 12, so that the valve stem 2 can be inserted into the interior of the valve core 1 from top to bottom.

[0020] In a preferred embodiment, such as Figure 1 , Figure 3 and 4 As shown, the locking nut 3 has a third central hole along its axial direction. The first rod 21 passes through the third central hole, and the bottom of the locking nut 3 is provided with a first conical surface 32 at the lower end of the third central hole. The first conical surface 32 has a conical structure that is larger at the top and smaller at the bottom. The top of the second rod 22 is provided with a second conical surface 221 that matches the first conical surface 32.

[0021] In this embodiment, the first rod 21 and the second rod 22 are fixedly connected, and the diameter of the first rod 21 is smaller than the diameter of the second rod 22. A second conical surface 221 is machined at the connection between the second rod 22 and the first rod 21. The second conical surface 221 is a conical structure with a smaller top and a larger bottom. A first conical surface 32 is machined at the lower end of the third central hole on the locking nut 3. The first conical surface 32 is a conical structure with a smaller top and a larger bottom. The slope angle of the first conical surface 32 is the same as the slope angle of the second conical surface 221. After the locking nut 3 is tightened between the locking nut 3 and the valve core 1, the second conical surface 221 at the bottom of the locking nut 3 is pressed tightly against the first conical surface 32 at the top of the second rod 22, which limits and fixes the valve rod 2 to prevent it from moving upward or loosening due to vibration.

[0022] In a preferred embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, a positioning hole 13 is also provided at the center of the valve core 1 along its axial direction. The positioning hole 13 is coaxially arranged below the second central hole 12 and communicates with the second central hole 12. The diameter of the positioning hole 13 is smaller than the diameter of the second central hole 12. The bottom of the second rod 22 is coaxially and fixedly connected to a positioning shaft 23, which is clearance-fitted with the positioning hole 13.

[0023] In this embodiment, the diameter of the positioning hole 13 is smaller than the diameter of the second center hole 12, which makes it easier to insert the positioning shaft 23 into the positioning hole 13 when tightening the valve stem 2; When the valve stem 2 is inserted into the valve core 1, the positioning shaft 23 and the positioning hole 13 on the valve core 1 are in clearance fit, which can effectively prevent the valve core 1 and valve stem 2 from being out of axis due to the unbalanced force applied by the plate when the valve core 1 and valve stem 2 are tightened, thereby improving the coaxiality of the assembly and further improving the assembly accuracy of the product.

[0024] In a preferred embodiment, such as Figure 1 As shown, the bottom of the positioning shaft 23 is welded and fixed to the valve core 1.

[0025] In this embodiment, after the valve stem 2 and the valve core 1 are tightened and fixed, the bottom of the positioning shaft 23 extends to the outside of the positioning hole 13 on the valve core 1. The positioning shaft 23 and the valve core 1 are welded around the surface of the protruding part of the positioning shaft 23, so that the valve stem 2 and the valve core 1 are welded and fixed, realizing the first welding fixation and improving the anti-loosening reliability between the valve stem 2 and the valve core 1; specifically, arrow B is the welding position.

[0026] In a preferred embodiment, such as Figure 1 , Figure 2 and Figure 4As shown, the top of the valve core 2 is provided with a first welding bevel 14 at the upper port of the first central hole 11, and the top of the locking nut 3 is provided with a second welding bevel 33 along its outer edge. The valve core 1 and the locking nut 3 are welded and fixed together by the first welding bevel 14 and the second welding bevel 33.

[0027] Preferably, the bevel angle of the first welding groove 14 is 45°-50°, and the bevel angle of the second welding groove 33 is 45°-50°.

[0028] In this embodiment, after the locking nut 3 is tightened between the locking nut 3 and the valve core 1, the first welding bevel 14 and the second welding bevel 33 are spliced ​​together to form an annular groove. The cross-section of the annular groove is "V" shaped. Argon arc welding or laser welding is performed in the annular groove to weld and fix the locking nut 3 and the valve core 1, thus achieving the second welding fixation. Specifically, arrow A indicates the welding position. This application adopts a combination of two anti-loosening methods: a positive and negative thread mechanical anti-loosening structure and welding fixation, which achieves dual protection against loosening of the connection structure. Compared with a single anti-loosening structure, it further improves the connection stability and has better anti-loosening reliability.

[0029] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A valve core and valve stem anti-loosening connection structure, characterized in that, include: The valve core has a first central hole and a second central hole that are coaxially connected along its axis. The inner wall of the first central hole is provided with a first internal thread, and the inner wall of the second central hole is provided with a second internal thread. The direction of rotation of the first internal thread is opposite to that of the second internal thread. The valve stem is sleeved in the first central hole and the second central hole of the valve core, and includes a first rod body and a second rod body that are coaxial and fixedly connected. The diameter of the first rod body is smaller than the diameter of the second rod body. A second external thread is provided on the outer wall of the second rod body, and the second external thread is engaged with the second internal thread. A locking nut is sleeved on the body of the first rod, with its end face near the second rod abutting against the end face of the second rod. A first external thread is provided on its outer wall, and the first external thread is engaged with the first internal thread.

2. The valve core and valve stem anti-loosening connection structure according to claim 1, characterized in that, The first central hole is located above the second central hole, and its diameter is larger than that of the second central hole. The first rod is inserted into the first central hole, and the second rod is inserted into the second central hole.

3. The valve core and valve stem anti-loosening connection structure according to claim 2, characterized in that, The locking nut has a third central hole along its axial direction. The first rod passes through the third central hole, and the bottom of the locking nut is provided with a first conical surface at the lower end of the third central hole. The first conical surface has a conical structure that is larger at the top and smaller at the bottom. The top of the second rod is provided with a second conical surface that matches the first conical surface.

4. The valve core and valve stem anti-loosening connection structure according to claim 1, characterized in that, The valve core is also provided with a positioning hole along its axial direction. The positioning hole is coaxially arranged below the second central hole and communicates with the second central hole. The diameter of the positioning hole is smaller than the diameter of the second central hole. The bottom of the second rod is coaxially and fixedly connected to a positioning shaft, and the positioning shaft is clearance-fitted with the positioning hole.

5. The valve core and valve stem anti-loosening connection structure according to claim 4, characterized in that, The bottom of the positioning shaft is welded and fixed to the valve core.

6. The valve core and valve stem anti-loosening connection structure according to claim 5, characterized in that, The valve core has a first welding bevel at the upper port of the first central hole, and the locking nut has a second welding bevel along its outer edge. The valve core and the locking nut are welded together by the first welding bevel and the second welding bevel.

7. The valve core and valve stem anti-loosening connection structure according to claim 6, characterized in that, The bevel angle of the first welding groove is 45°-50°, and the bevel angle of the second welding groove is 45°-50°.

Images