Regulating valve packing structure

Abstract

This utility model relates to the field of regulating valve technology, and discloses a regulating valve packing sealing structure, including a valve cover body, a stuffing box at the top of the valve cover body, a first packing group at the bottom inner side of the stuffing box, a central pre-tightening component at the top of the first packing group, a second packing group at the top of the central pre-tightening component, a packing sleeve at the top of the second packing group, a bolt groove at the top of the valve cover body, a movable groove on the side of the bolt groove, and a movable block slidably installed at the bottom of the movable groove; the beneficial effects are: the central pre-tightening component can simultaneously perform compression and sealing operations on the first and second packing groups, making the sealing effect more reliable, and the second packing group is locked and controlled by a packing screw and a locking bolt. The packing screw and locking bolt components are precisely matched and can jointly control the locking degree of the packing group, achieving a mutual locking effect, further improving the connection stability of the sealing structure.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, specifically to a regulating valve packing seal structure. Background Technology

[0002] The control valve uses a packing gland to seal the valve seat and control mechanism. The packing is packed in the packing gland and the packing assembly is pressed and limited by a packing pressure plate structure. However, in actual use, it has been found that when the control valve controls the flow of the medium, the impact of the medium causes the valve body to be in a state of continuous shaking or vibration. This shaking and vibration can cause the nuts and screws to come loose, which in turn causes the packing pressure plate to loosen and the seal to be incomplete. At this time, the locking seal of the internal packing is no longer stable, and the packing is prone to falling out of the packing gland, resulting in leakage of the medium inside the valve body. Therefore, this utility model proposes a packing sealing structure for control valves to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a packing seal structure for a regulating valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a packing seal structure for a regulating valve, comprising...

[0005] The valve cover body has a stuffing box at its top, a first packing assembly at the bottom inner side of the stuffing box, a central preload assembly at the top of the first packing assembly, a second packing assembly at the top of the central preload assembly, and a packing sleeve at the top of the second packing assembly. The valve cover body also has a bolt groove at its top, a movable groove on its side, a movable block slidably mounted at the bottom of the movable groove, an inclined block slidably mounted at the top of the movable block, and a ball groove on its side, containing a top ball movably mounted at the bottom of the movable groove and slidably contacting the central preload assembly.

[0006] Preferably, the center pre-tightening assembly includes a tightening block, the top of which is in contact with the bottom of the second packing group, and a first snap-fit ​​block is fixedly provided at the bottom of the tightening block.

[0007] Preferably, a second snap-fit ​​block is movably snap-fitted onto the side of the first snap-fit ​​block, and the first snap-fit ​​block and the second snap-fit ​​block are designed to be in an "interlocking" state. A tightening block is fixedly installed at the bottom of the second snap-fit ​​block, and the bottom of the tightening block is in close contact with the top of the first packing assembly.

[0008] Preferably, a packing screw is fitted inside the bolt groove, the bottom of the packing screw slides in contact with the inclined block, and a packing pressure plate is fitted on the side of the packing screw.

[0009] Preferably, the bottom of the packing pressure plate is in close contact with the top of the packing sleeve, and a locking bolt is installed on the top of the packing pressure plate, which is locked to the packing screw.

[0010] Preferably, a valve stem is inserted and installed inside the stuffing box, and the valve cover is in close contact with the first packing group, the second packing group, and the central preload assembly.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a central pre-tightening component, during the locking process of the packing screw, through the transmission of the inclined block and the movable block, the central pre-tightening component can simultaneously perform a compression and sealing operation on the first packing group and the second packing group, which enhances the stability of the entire sealing structure, makes the sealing effect more reliable, and effectively prevents the packing from falling out of the stuffing box. Moreover, the second packing group is locked and controlled by the packing screw and the locking bolt. The packing screw and the locking bolt components are precisely matched and can jointly control the degree of locking of the packing group, which has a mutual locking effect, further improving the connection stability of the sealing structure. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the cross-section of the structure of this utility model;

[0014] Figure 3 yes Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0015] Figure 4 This is a schematic diagram of the structure of the filler assembly of this utility model.

[0016] In the diagram: 1. Valve cover body; 2. Stuffing box; 3. First packing assembly; 4. Second packing assembly; 5. Packing sleeve; 6. Bolt groove; 7. Movable groove; 8. Movable block; 9. Inclined block; 10. Ball groove; 11. Top ball; 12. Tightening block; 13. First snap-fit ​​block; 14. Second snap-fit ​​block; 15. Tightening block; 16. Packing screw; 17. Packing pressure plate; 18. Locking bolt; 19. Valve stem. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Please see Figures 1 to 4 This utility model provides a technical solution: a packing seal structure for a regulating valve, comprising...

[0019] The valve cover body 1 has a stuffing box 2 on its top. The bottom inner side of the stuffing box 2 is equipped with a first packing group 3. The top of the first packing group 3 is equipped with a central pre-tightening component. The top of the central pre-tightening component is equipped with a second packing group 4. The top of the second packing group 4 is equipped with a packing sleeve 5. The two packing groups improve the sealing effect of the overall structure.

[0020] The valve cover body 1 has a bolt groove 6 on its top and a movable groove 7 on its side. A movable block 8 is slidably installed at the bottom of the movable groove 7. An inclined block 9 is slidably installed on the top of the movable block 8. A ball groove 10 is opened on the side of the movable block 8, and a top ball 11 is installed in the ball groove 10. The top ball 11 is slidably installed at the bottom of the movable groove 7 and is in contact with the central pre-tightening component. A packing screw 16 is installed inside the bolt groove 6. The bottom of the packing screw 16 is in slidable contact with the inclined block 9. A packing pressure plate 17 is installed on the side of the packing screw 16. During the locking process between the packing screw 16 and the bolt groove 6, it will contact the inclined block 9. The inclined block 9 will slide down under the pressure of the packing screw 16 and push the movable block 8 to slide in the movable groove 7. At this time, the movable block 8 drives the top ball 11 to press against the central pre-tightening component, which can realize the limiting and pressing of the first packing group 3.

[0021] The center pre-tightening assembly includes an upper tightening block 12, the top of which is in contact with the bottom of the second packing group 4. A first snap-fit ​​block 13 is fixedly installed at the bottom of the upper tightening block 12, and a second snap-fit ​​block 14 is movably snap-fitted to the side of the first snap-fit ​​block 13. The first snap-fit ​​block 13 and the second snap-fit ​​block 14 are designed to be in an "interlocking" state. A lower tightening block 15 is fixedly installed at the bottom of the second snap-fit ​​block 14, and the bottom of the lower tightening block 15 is in close contact with the top of the first packing group 3. When the upper tightening block 12 and the lower tightening block 15 in the center pre-tightening assembly are pressed by the top ball 11, the upper tightening block 12 and the lower tightening block slide upward and downward at the same time, which can press and seal the top of the first packing group 3 and the bottom of the second packing group 4. The structure is compact and the connection is stable.

[0022] The bottom of the packing pressure plate 17 is in close contact with the top of the packing sleeve 5. The top of the packing pressure plate 17 is equipped with a locking bolt 18, which is locked to the packing screw 16. During the tightening process of the locking bolt 18 with the packing screw 16, the locking bolt 18 will press down on the packing pressure plate 17, which in turn presses down on the packing sleeve 5. At this time, the packing sleeve 5 and the upper tightening plate simultaneously compress and seal the second packing group 4, and the locking bolt 18 continues to tighten. The packing sleeve 5 transmits the force to the packing group and the central pre-tightening component. At this time, the upper tightening block 12 presses down on the top ball 11, the top ball 11 pushes the movable block 8 in the opposite direction, the movable block 8 pushes the inclined block 9, and the inclined block 9 locks the packing screw 16 in the opposite direction, improving the connection stability of the structure of the packing screw 16 and the locking bolt 18, thereby preventing the packing from loosening in the compressed state.

[0023] A valve stem 19 is inserted and installed inside the stuffing box 2, and the valve cover is in close contact with the first packing group 3, the second packing group 4 and the central preload assembly.

[0024] In practical use: First, install the valve stem 19 in the stuffing box 2. Then, add the first packing group 3, the central pre-tightening assembly, and the second packing group 4 to the stuffing box 2 in sequence. Install the packing sleeve 5 on top of the second packing group 4. After the packing is installed, insert the packing screw 16 into the bolt groove 6. During the locking process of the packing screw 16 and the bolt groove 6, it will contact the inclined block 9. The inclined block 9 will slide down under the pressure of the packing screw 16 and push the movable block 8 to slide in the movable groove 7. At this time, the movable block 8 will drive the top ball 11 to press against the central pre-tightening assembly. When the upper tightening block 12 and the lower tightening block 15 in the central pre-tightening assembly are pressed by the top ball 11, the upper tightening block 12 and the lower tightening block 15 slide up and down at the same time, which can press against the first packing group 3. The top of the packing assembly 3 and the bottom of the second packing assembly 4 are pressed and sealed. Finally, a packing pressure plate 17 is installed on the side of the packing screw 16 and tightened with a locking bolt 18. At this time, the locking bolt 18 will press down the packing pressure plate 17, and the packing pressure plate 17 will press down the packing sleeve 5. At this time, the packing sleeve 5 and the upper tightening plate simultaneously press and seal the second packing assembly 4, and the locking bolt 18 will continuously tighten. The packing sleeve 5 will transfer the force to the packing assembly and the central pre-tightening component. At this time, the upper tightening block 12 presses down the top ball 11, the top ball 11 pushes the movable block 8 in the opposite direction, the movable block 8 pushes the inclined block 9, and the inclined block 9 locks the packing screw 16 in the opposite direction, achieving the effect of mutual locking and improving the connection stability of the sealing structure.

[0025] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A packing seal structure for a regulating valve, characterized in that: The valve cover body (1) includes a stuffing box (2) on the top of the valve cover body (1), a first packing group (3) on the bottom inner side of the stuffing box (2), a center pre-tightening component on the top of the first packing group (3), a second packing group (4) on the top of the center pre-tightening component, a packing sleeve (5) on the top of the second packing group (4), a bolt groove (6) on the top of the valve cover body (1), a movable groove (7) on the side of the bolt groove (6), a movable block (8) slidably installed at the bottom of the movable groove (7), an inclined block (9) slidably installed at the top of the movable block (8), a ball groove (10) on the side of the movable block (8), a top ball (11) installed in the ball groove (10), the top ball (11) slidably installed at the bottom of the movable groove (7), and the top ball (11) slidably installed in contact with the center pre-tightening component.

2. The regulating valve packing seal structure according to claim 1, characterized in that: The center pre-tightening assembly includes a tightening block (12), the top of which is in contact with the bottom of the second packing group (4), and a first snap-fit ​​block (13) is fixedly provided at the bottom of the tightening block (12).

3. The regulating valve packing seal structure according to claim 2, characterized in that: The first snap-fit ​​block (13) is provided with a second snap-fit ​​block (14) on its side. The first snap-fit ​​block (13) and the second snap-fit ​​block (14) are designed to be "mutual". The bottom of the second snap-fit ​​block (14) is fixedly installed with a tightening block (15), and the bottom of the tightening block (15) is in close contact with the top of the first packing group (3).

4. The packing seal structure for a regulating valve according to claim 3, characterized in that: The inner side of the bolt groove (6) is fitted with a packing screw (16), the bottom of the packing screw (16) slides in contact with the inclined block (9), and the side of the packing screw (16) is fitted with a packing pressure plate (17).

5. The packing seal structure for a regulating valve according to claim 4, characterized in that: The bottom of the packing pressure plate (17) is in close contact with the top of the packing sleeve (5), and the top of the packing pressure plate (17) is equipped with a locking bolt (18), which is locked to the packing screw (16).

6. The packing seal structure for a regulating valve according to claim 5, characterized in that: A valve stem (19) is inserted into the inner side of the stuffing box (2), and the valve cover body (1) is in close contact with the first packing group (3), the second packing group (4) and the center preload assembly.

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