Connecting structure of valve rod and valve head

Abstract

The utility model provides a connecting structure of a valve rod and a valve head, the valve rod and the valve head are connected by fixing a connecting ring at the top end of the valve rod, the valve head is sleeved on the outer ring of the connecting ring, a fixing block is arranged, and the head of the fixing block abuts against the top end of the connecting ring and the top end of the valve head to fix the connecting ring and the valve head. When the positioning block is arranged at the connecting part of the connecting ring and the valve head, the valve head cannot rotate; an anti-loosening ring is arranged on the connecting portion of the connecting ring and the fixing block, the anti-loosening ring is of a special oval structure, friction force is increased when the fixing block moves in the direction opposite to the thread fastening direction, the anti-loosening effect is achieved, and further fixing is conducted through a columnar pin. By the adoption of the technical scheme, the connecting ring abuts against the top end of the valve head through the fixing block, and the valve rod and the valve head are effectively connected; besides threaded connection, the connecting ring on the fixing block and the connecting ring on the valve rod are additionally provided with the anti-loosening ring with the oval section, when the threads are loosened, friction force is increased, the loosening speed is reduced, and meanwhile the sealing effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of angle control valve equipment, specifically to a connection structure between a valve stem and a valve head. Background Technology

[0002] The valve head, also known as the valve core in the industry, is connected by fusion welding because the valve stem and valve head are made of different materials. This can lead to a large difference in the coefficients of thermal expansion between the two materials, and residual stress may be generated after cooling. Therefore, the fusion welding connection method has been gradually phased out.

[0003] Furthermore, the existing connection between the valve stem and valve head is usually a threaded connection, which has advantages such as simple assembly and low cost. However, threaded connections are prone to loosening under vibration and pressure changes during use. While the valve core can block water from flowing from the high-pressure chamber to the low-pressure chamber, it does not seal the high-pressure chamber itself. Therefore, under water pressure impact, the assembly gap between the valve core and valve stem can become a leakage channel, causing water to overflow from the valve body along the valve stem. In actual use, when leakage occurs in the chamber, during maintenance, installers will place a plastic film between the threads. This can prevent loosening to some extent and has a certain leak-proof effect in the short term. However, this requires installers to have skilled plastic film wrapping techniques, and the plastic film may loosen as the threads loosen. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technology by proposing a connection structure between the valve stem and the valve head, aiming to solve the problem of fluid leakage after the threaded connection becomes loose.

[0005] This utility model provides a connection structure between a valve stem and a valve head, including a valve stem and a valve head. A connecting ring is fixedly connected to one end of the valve stem near the valve head. The valve head is fitted onto the outer ring of the connecting ring. A fixing block for fixing the connection between the connecting ring and the valve head is threaded onto the inner circumference of the connecting ring. A positioning mechanism for preventing the valve head from rotating is embedded between the connection part of the connecting ring and the valve head. An anti-loosening mechanism for preventing thread loosening is embedded in the threaded connection part of the connecting ring and the fixing block.

[0006] The fixing block is a T-shaped column. The rod of the fixing block is threaded to the inner circumference of the connecting ring, and the head of the fixing block is pressed against the top of the connecting ring and the valve head.

[0007] Preferably, the positioning mechanism includes a first keyway formed on the outer ring of the connecting ring, and a second keyway formed on the inner wall of the valve head that corresponds to and engages with the first keyway. A key block is engaged in the first keyway and the second keyway, and the space formed by the key block engaging with the first keyway and the second keyway fits to position the valve head.

[0008] Preferably, the anti-loosening mechanism includes an annular groove formed in the inner ring of the connecting ring, an anti-loosening ring is embedded in the annular groove, the side of the anti-loosening ring away from the annular groove abuts against the extension of the fixing block rod, and the diameter of the extension of the fixing block rod is smaller than the diameter of the fixing block rod.

[0009] The cross-sectional profile of the anti-loosening ring is an oval shape with a gradual curvature on one side. Its curvature convergence end points to the head side of the fixing block. The annular groove matches the curvature-gradient side of the anti-loosening ring. The anti-loosening ring is made of flexible material.

[0010] The non-converging end of the anti-loosening ring has a slot, and the extension of the fixing block rod has a one-way slot. The one-way slot engages with the slot, and the one-way locking points to one side of the fixing block head.

[0011] Preferably, the connecting ring has an opening at one end near the head of the fixing block, and the head of the fixing block has a through hole. The opening and the through hole are connected to each other, and a column pin is inserted into the opening and the through hole. The column pin is close to the anti-loosening ring and abuts against the anti-loosening ring.

[0012] A plug is installed at the end of the through hole away from the hole. The plug is interference-fitted with the through hole and abuts against the column pin.

[0013] Compared with existing technologies, it has the following beneficial effects:

[0014] This utility model provides a connection structure for a valve stem and a valve head. The valve stem and valve head are connected by a connecting ring fixed to the top of the valve stem. The valve head is fitted onto the outer ring of the connecting ring. A fixing block is provided, with its head pressing against the top of both the connecting ring and the valve head to secure them. The valve head cannot rotate when a positioning block is provided at the connection between the connecting ring and the fixing block. An anti-loosening ring with a special oval structure is provided at the connection between the connecting ring and the fixing block. This anti-loosening ring increases friction when the fixing block moves in the opposite direction of thread tightening, achieving an anti-loosening effect. It is further secured by a columnar pin. Using this technical solution, the valve stem and valve head are effectively connected by the fixing block pressing against the top of the connecting ring and the valve head. In addition to the threaded connection, the connecting ring on the fixing block and the valve stem has an oval-shaped anti-loosening ring, which increases friction and slows down the loosening process when the threads loosen. Furthermore, the anti-loosening ring is made of flexible material, providing a seal even when the threads are loose. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the connection structure between the valve stem and the valve head according to the present invention;

[0017] Figure 2 This is a planar view of the connection structure between the valve stem and the valve head according to this utility model;

[0018] Figure 3 This is an exploded view of the connection structure between the valve stem and the valve head according to this utility model;

[0019] Figure 4 This is a cross-sectional view of the valve head of this utility model;

[0020] Figure 5 This is a cross-sectional view of the fixing block of this utility model;

[0021] Figure 6 This is a cross-sectional view of the connecting ring of this utility model;

[0022] Figure 7 This is a cross-sectional view of the anti-loosening ring of this utility model;

[0023] Figure 8 This is a schematic diagram of the anti-loosening ring of this utility model.

[0024] In the diagram, 1-valve stem; 11-connecting ring; 111-opening; 2-valve head; 3-fixing block; 31-one-way groove; 32-through hole; 4-positioning mechanism; 41-first keyway; 42-second keyway; 43-key block; 5-anti-loosening mechanism; 51-annular groove; 52-anti-loosening ring; 53-slot; 6-column pin; 7-plug. Detailed Implementation

[0025] To better understand the structure, functional features, and advantages of this utility model, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0026] Example:

[0027] like Figures 1 to 8 As shown, this utility model provides a connection structure between a valve stem and a valve head, including a valve stem 1 and a valve head 2. A connecting ring 11 is fixedly connected to one end of the valve stem 1 near the valve head 2. The valve head 2 is sleeved on the outer ring of the connecting ring 11. A fixing block 3 for fixing the connection between the connecting ring 11 and the valve head 2 is threadedly connected to the inner circumference of the connecting ring 11. A positioning mechanism 4 for preventing the valve head 2 from rotating is embedded between the connection part of the connecting ring 11 and the valve head 2. An anti-loosening mechanism 5 for preventing thread loosening is embedded in the threaded connection part of the connecting ring 11 and the fixing block 3. The fixing block 3 is a T-shaped column. The rod part of the fixing block 3 is threadedly connected to the inner circumference of the connecting ring 11, and the head of the fixing block 3 abuts against the top of the connecting ring 11 and the valve head 2.

[0028] The connecting ring 11 and the valve stem 1 are welded or integrally formed. The inner ring of the connecting ring 11 is threaded, and the valve head 2 is located on the outer ring of the connecting ring 11. The fixing block 3 is a T-shaped cylinder. The larger diameter part of the upper part of the T-shaped cylinder is the head, and the smaller diameter part is the rod. The rod is provided with threads that mesh with the inner ring threads of the connecting ring 11. In use, after the valve head 2 is fitted onto the outer ring of the connecting ring 11, the rod of the fixing block 3 is threaded onto the inner ring of the connecting ring 11, connecting the fixing block 3 and the connecting ring 11. The head of the fixing block 3 then presses the connecting ring 11 and the valve head 2 together. During production, the top of the valve head 2 and the connecting ring 11 are provided with grooves that fit with the head of the fixing block 3. Since the connection between the head of the fixing block 3 and the valve head 2 is only abutting at this point, the valve head 2 may rotate under external force during use, resulting in a loose connection between the valve head 2 and the fixing block 3. Therefore, a positioning mechanism 4 is provided at the outer ring connection of the valve head 2 connecting ring 11 to prevent the valve head 2 from rotating. During use, long-term vibration may loosen the threaded connection between the connecting ring 11 and the fixing block 3, and there is even a risk of it falling off. Therefore, an anti-loosening mechanism 5 is provided at the connection between the connecting ring 11 and the fixing block 3 to reinforce the threaded connection.

[0029] As another embodiment, such as Figures 4 to 6 As shown, the positioning mechanism 4 of this application includes a first keyway 41 opened on the outer ring of the connecting ring 11, and a second keyway 42 opened on the inner wall of the valve head 2 that corresponds to and engages with the first keyway 41. A key block 43 is engaged in the first keyway 41 and the second keyway 42. The space formed by the engagement of the key block 43 with the first keyway 41 and the second keyway 42 fits to position the valve head 2.

[0030] Both the first keyway 41 and the second keyway 42 are non-closed arc-shaped grooves opened along the outer ring of the connecting ring 11 or the inner wall of the valve head 2, i.e., not complete circular arc grooves. The key block 43 is made of metal, and multiple key blocks 43 can be provided; this application provides two. During installation, the key block 43 is first placed in the first keyway 41, then the valve head 2 is fitted onto the connecting ring 11, and the part of the key block 43 extending beyond the first keyway 41 is aligned with the second keyway 42. The second keyway 42 is a fully open groove at the end that first contacts the key block 43, and a blind groove on the side that contacts the top of the key block 43, used to abut against the key block 43. The key block 43 can prevent the valve head 2 from rotating.

[0031] As another embodiment, such as Figure 6 and Figure 8As shown, the anti-loosening mechanism 5 of this application includes an annular groove 51 formed in the inner ring of the connecting ring 11. An anti-loosening ring 52 is embedded in the annular groove 51. The side of the anti-loosening ring 52 away from the annular groove 51 abuts against the extension of the rod of the fixing block 3. The diameter of the extension of the rod of the fixing block 3 is smaller than the diameter of the rod of the fixing block 3. The cross-sectional profile of the anti-loosening ring 52 is an oval shape with a gradually changing curvature on one side. Its curvature convergence end points towards the head side of the fixing block 3. The annular groove 51 matches the curvature convergence side of the anti-loosening ring 52. The anti-loosening ring 52 is made of flexible material. A slot 53 is formed at the non-converging end of the anti-loosening ring 52. A one-way groove 31 is formed on the extension of the rod of the fixing block 3. The one-way groove 31 engages with the slot 53, and the one-way locking points towards the head side of the fixing block 3.

[0032] The anti-loosening ring 52 is made of a highly tough and corrosion-resistant rubber material such as polyvinylidene fluoride. Both the one-way groove 31 and the locking groove 53 are helical tooth structures, consisting of a guide slope and a locking surface. When the extension of the rod of the fixing block 3 moves away from the head of the fixing block 3, the frictional force in contact with the anti-loosening ring 52 is less than the frictional force when the extension of the rod of the fixing block 3 moves closer to the head of the fixing block 3. In use, the anti-loosening ring 52 is first inserted into the annular groove 51, with the converging end of the anti-loosening ring 52 pointing towards the head of the fixing block 3, facilitating the insertion of the rod of the fixing block 3 into the connecting ring 11. The rod of the fixing block 3 is then connected to the inner ring of the connecting ring 11 via threads. At this point, the extension of the fixing block 3 is tightly fitted against the anti-loosening ring 52. When the thread loosens, the fixing block 3 moves to one side of its head. The extension of the fixing block 3 is in close contact with the anti-loosening ring 52, and the one-way groove 31 engages with the slot 53 of the anti-loosening ring 52. As the fixing block 3 moves upward, it drives the anti-loosening ring 52 to rotate. Since the cross-section of the anti-loosening ring 52 is oval, the thicker part of the anti-loosening ring 52 gradually abuts against the extension of the fixing block 3 during the upward movement. This not only increases the friction between the anti-loosening ring 52 and the fixing block 3, but also provides a seal.

[0033] As another embodiment, such as Figures 2 to 4 As shown, the connecting ring 11 of this application has an opening 111 at one end near the head of the fixing block 3, and the head of the fixing block 3 has a through hole 32. The opening 111 and the through hole 32 are connected to each other. A column pin 6 is inserted into the opening 111 and the through hole 32. The side of the column pin 6 near the anti-loosening ring 52 abuts against the anti-loosening ring 52. A plug 7 is embedded at the end of the through hole 32 away from the opening 111. The plug 7 is interference-fitted with the through hole 32 and abuts against the column pin 6.

[0034] The column pin 6 can be a cylindrical pin or a prismatic pin; however, to save costs, a cylindrical pin is used in this application. After the valve head 2 is connected to the connecting ring 11 and the fixing block 3, the column pin 6 is inserted into the opening 111 and the through hole 32, and the end of the column pin 6 abuts against the anti-loosening ring 52. The column pin 6 compresses the anti-loosening ring 52, further increasing the friction between the anti-loosening ring 52 and the extension of the fixing block 3. The end of the column pin 6 that abuts against the anti-loosening ring 52 is chamfered to prevent the column pin 6 from cutting the anti-loosening ring 52. Furthermore, the friction between the column pin 6 and the anti-loosening ring 52 is small during rotation, minimizing rotational resistance and allowing the anti-loosening ring 52 to function effectively. The plug 7 is made of metal and can be sealed by welding or interference fit to prevent the column pin 6 from slipping out. This solution uses an interference fit.

[0035] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A connection structure between a valve stem and a valve head, comprising a valve stem and a valve head, characterized in that, A connecting ring (11) is fixedly connected to one end of the valve stem (1) near the valve head (2). The valve head (2) is sleeved on the outer ring of the connecting ring (11). A fixing block (3) for fixing the connection between the connecting ring (11) and the valve head (2) is threadedly connected to the inner circumference of the connecting ring (11). A positioning mechanism (4) for preventing the valve head (2) from rotating is embedded between the connecting ring (11) and the valve head (2). An anti-loosening mechanism (5) for preventing thread loosening is embedded in the threaded connection between the connecting ring (11) and the fixing block (3).

2. The connection structure between the valve stem and the valve head according to claim 1, characterized in that, The fixing block (3) is a T-shaped column. The rod of the fixing block (3) is threaded to the inner circumference of the connecting ring (11). The head of the fixing block (3) abuts against the top of the connecting ring (11) and the valve head (2).

3. The connection structure between the valve stem and the valve head according to claim 2, characterized in that, The positioning mechanism (4) includes a first keyway (41) on the outer ring of the connecting ring (11), and a second keyway (42) on the inner wall of the valve head (2) that corresponds to and engages with the first keyway (41). A key block (43) is engaged in the first keyway (41) and the second keyway (42). The space formed by the key block (43) engaging with the first keyway (41) and the second keyway (42) is fitted to position the valve head (2).

4. The connection structure between the valve stem and the valve head according to claim 2, characterized in that, The anti-loosening mechanism (5) includes an annular slot (51) opened in the inner ring of the connecting ring (11), and an anti-loosening ring (52) is embedded in the annular slot (51). The side of the anti-loosening ring (52) away from the annular slot (51) abuts against the extension of the rod of the fixing block (3). The diameter of the extension of the rod of the fixing block (3) is smaller than the diameter of the rod of the fixing block (3).

5. The connection structure between the valve stem and the valve head according to claim 4, characterized in that, The cross-sectional profile of the anti-loosening ring (52) is an oval shape with a gradual curvature on one side, and its curvature convergence end points to the head side of the fixing block (3). The annular slot (51) matches the curvature-gradient side of the anti-loosening ring (52). The anti-loosening ring (52) is made of flexible material.

6. The connection structure between the valve stem and the valve head according to claim 5, characterized in that, The non-converging end of the anti-loosening ring (52) is provided with a slot (53), and the extension of the rod of the fixing block (3) is provided with a one-way slot (31). The one-way slot (31) engages with the slot (53) and the one-way locking is directed to one side of the head of the fixing block (3).

7. The connection structure between the valve stem and the valve head according to claim 6, characterized in that, The connecting ring (11) has an opening (111) at one end near the head of the fixing block (3), and the fixing block (3) has a through hole (32) at its head. The opening (111) and the through hole (32) are connected to each other. A column pin (6) is inserted into the opening (111) and the through hole (32). The column pin (6) is close to the anti-loosening ring (52) and abuts against the anti-loosening ring (52).

8. The connection structure between the valve stem and the valve head according to claim 7, characterized in that, A plug (7) is embedded at one end of the through hole (32) away from the opening (111). The plug (7) is interference-fitted with the through hole (32) and abuts against the column pin (6).

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