Sealing structure for valve rod

Abstract

The utility model relates to the technical field of valve rod sealing, in particular to a sealing structure used for a valve rod, the sealing structure used for the valve rod comprises a valve body, a valve cover and a valve rod main body, the top end of the valve body is in butt joint with the valve cover, and the valve rod main body is connected in the valve cover in a sliding mode; the sealing structure for the valve rod has the beneficial effects that when the sealing structure for the valve rod is used, multiple sealing points are formed through the packing barrel, the sealing ring, the rubber sealing seat and the sealing ring, then the sealing performance of the sealing structure is improved, when a certain sealing point loses efficacy, sealing can be continued through other sealing points to prevent leakage, then the sealing reliability is improved, and the service life of the valve rod is prolonged. Therefore, when the sealing structure of the valve rod is used, the effect of facilitating stable sealing is achieved, the stability of the valve cover during fixing is improved by limiting the valve cover in the vertical direction and the horizontal direction, and therefore when the sealing structure of the valve rod is used, the effect of facilitating stable fixing of the valve cover is achieved.

Description

Technical Field

[0001] The utility model relates to the field of valve stem sealing, in particular to a sealing structure for a valve stem. Background Art

[0002] The valve stem is an important component of the valve and is used for transmission. It is connected to the actuator or handle on the top and directly drives the valve core to move or rotate on the bottom to achieve the opening or closing or regulating function of the valve. The sealing structure of the valve stem is one of the key components in the valve, and its main function is to prevent medium leakage when the valve is working.

[0003] When the sealing structure for the valve stem is used, the sealing effect is achieved by compacting the contact surface between the stuffing tube and the stem and the sleeve, thereby preventing the medium in the valve body from leaking from the valve stem body and the valve cover; but when sealing is only performed by the stuffing, the sealing performance of the stuffing will inevitably be affected as the use time increases and the valve stem moves back and forth, thereby causing the sealing effect at the valve stem to deteriorate, resulting in medium leakage at the valve stem. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing structure for a valve stem to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the utility model provides the following technical solutions: a sealing structure for a valve stem, the sealing structure for a valve stem comprising: a valve body, a valve cover and a valve stem body, the top end of the valve body is butted with a valve cover, and the inside of the valve cover is slidably connected with the valve stem body.

[0006] Preferably, a packing cylinder is connected to the interior of the valve body, and a packing pressure plate is butt-jointed to the top end of the packing cylinder.

[0007] Preferably, the top of the packing pressure plate is connected to a sealing ring, and the inner wall of the sealing ring is connected to a spiral spring. Preferably, the outer wall of the sealing ring is connected to a pressing seat, and the pressing seat is connected to a rubber sealing seat through a clamping groove.

[0008] Preferably, a sealing ring is connected inside the valve cover via a sealing cavity.

[0009] Preferably, both sides of the bottom end of the valve cover are butted with limit pins, and both sides of the outer wall of the valve body are connected with fixed seats.

[0010] Preferably, a fixing strip is butted against the top of the fixing seat, and a fixing pin is welded to the middle of the outer wall of the fixing seat.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: when the sealing structure for the valve stem is used, multiple sealing points are formed by the stuffing tube, the sealing ring, the rubber sealing seat and the sealing ring, thereby improving the sealing performance of the sealing structure, and when a sealing point fails, it can continue to seal through other sealing points to prevent leakage, thereby improving the reliability of the seal, so that when the sealing structure of the valve stem is used, it plays a role in facilitating stable sealing, and by limiting the valve cover in the vertical and horizontal directions, the stability of the valve cover when it is fixed is improved, so that when the sealing structure of the valve stem is used, it plays a role in facilitating stable fixing of the valve cover.

[0012] When the sealing structure for the valve stem proposed by the utility model is used, the rubber sealing seat is deformed to increase the sealing effect between the rubber sealing seat and the valve stem body, and then the sealing ring and the spiral spring cooperate with each other to adapt to the irregular surface, and then assist the sealing to a certain extent, so that multiple sealing points are formed by the stuffing tube, the sealing ring, the rubber sealing seat and the sealing ring, and the sealing performance of the sealing structure is improved. When a sealing point fails, other sealing points can continue to seal to prevent leakage, thereby improving the reliability of the seal and reducing the number of maintenance times of the staff, so that when the sealing structure of the valve stem is used, it plays a role in facilitating stable sealing;

[0013] When the sealing structure for the valve stem proposed by the utility model is used, the valve cover is first moved to make the limit pin dock with the valve body, thereby limiting the valve cover, and then the fixing seat is moved until the fixing bar penetrates the valve cover and docks with the valve body, and the fixing pin docks with the valve body, and then the valve cover is limited from the vertical direction and the horizontal direction, thereby improving the stability of the valve cover when it is fixed, so that when the sealing structure of the valve stem is used, it plays a role in facilitating the stable fixation of the valve cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the three-dimensional cutaway structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the three-dimensional cutaway structure of the compression seat of the utility model;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the helical spring of the utility model;

[0018] Figure 5 This is a schematic diagram of the main cutaway structure of the valve cover of the utility model;

[0019] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing seat of the utility model.

[0020] In the figure: 1. valve body; 2. valve cover; 3. valve stem body; 4. stuffing tube; 5. stuffing pressure plate; 6. sealing ring; 7. spiral spring; 8. clamping seat; 9. rubber sealing seat; 10. sealing ring; 11. limit pin; 12. fixing seat; 13. fixing strip; 14. fixing pin. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] See also Figures 1 to 4 The utility model provides a technical solution: a sealing structure for a valve stem, the sealing structure for the valve stem comprising: a valve body 1, a valve cover 2 and a valve stem body 3, the top end of the valve body 1 is butted with the valve cover 2, and the inside of the valve cover 2 is slidably connected with the valve stem body 3; a stuffing tube 4 is connected inside the valve body 1, and a stuffing pressure plate 5 is butted at the top end of the stuffing tube 4; a sealing ring 6 is connected to the top end of the stuffing pressure plate 5, and a spiral spring 7 is connected to the inner wall of the sealing ring 6; a pressing seat 8 is connected to the outer wall of the sealing ring 6, and the pressing seat 8 is connected to a rubber sealing seat 9 through a clamping groove; a sealing ring 10 is connected to the inside of the valve cover 2 through a sealing cavity; the rubber sealing seat 9 and the sealing ring 10 are parallel to each other, and the inner walls of the rubber sealing seat 9 and the sealing ring 10 are both connected to the valve stem body 3.

[0024] During the use of the sealing structure of the valve stem, after the valve cover 2 has been docked with the valve body 1, the packing pressure plate 5 is connected to the packing tube 4. At this time, the packing pressure plate 5 exerts pressure on the packing tube 4, so that the packing tube 4 and the valve stem body 3 are closely fitted, thereby sealing the valve stem body 3. Moreover, since the protrusion at the top of the rubber sealing seat 9 is higher than the pressing seat 8, when the valve cover 2 squeezes the rubber sealing seat 9, the rubber sealing seat 9 is deformed, thereby increasing the contact area between the rubber sealing seat 9 and the valve stem body 3, thereby increasing the sealing effect between the rubber sealing seat 9 and the valve stem body 3.

[0025] Since the sealing ring 6 is internally connected with a coil spring 7, when the pressing seat 8 moves downward to squeeze the sealing ring 6, the coil spring 7 will provide compression elasticity, thereby causing the outer layer of the sealing ring 6 to undergo plastic deformation, and each circle of the coil spring 7 can act independently to make the sealing ring 6 adapt to the irregular surface, thereby assisting the sealing to a certain extent;

[0026] Afterwards, a sealing mechanism is formed at the valve cover 2 through the deformation of the sealing ring 10, and then multiple sealing points are formed through the stuffing tube 4, the sealing ring 6, the rubber sealing seat 9 and the sealing ring 10, thereby improving the sealing performance of the sealing structure. Then, when a sealing point fails, other sealing points can continue to seal to prevent leakage, thereby improving the reliability of the seal and reducing the number of maintenance times by the staff, so that when the sealing structure of the valve stem is used, it plays a role in facilitating stable sealing.

[0027] Embodiment 2

[0028] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 The utility model provides a technical solution: a sealing structure for a valve stem, wherein limit pins 11 are connected to both sides of the bottom end of the valve cover 2, and fixed seats 12 are connected to both sides of the outer wall of the valve body 1; a fixing strip 13 is connected to the top of the fixing seat 12, and a fixing pin 14 is welded to the middle of the outer wall of the fixing seat 12, and the fixing seat 12 is symmetrically distributed about the vertical center line of the valve stem body 3, a limit hole is opened on the outer wall of the top end of the valve body 1 to connect with the limit pin 11, and a fixing cavity is opened at the bottom end of the valve cover 2 to connect with the fixing strip 13.

[0029] During the use of the sealing structure of the valve stem, when the valve cover 2 needs to be replaced, since the valve cover 2 is connected to the limit pin 11, the valve cover 2 is manually moved to dock with the top of the valve body 1. At this time, the limit pin 11 is docked with the limit hole of the valve body 1, and then the valve cover 2 is limited to prevent the valve cover 2 from rotating at will. Then the fixing seat 12 is moved, and since the fixing seat 12 is connected to the fixing bar 13 and the fixing pin 14, the movement of the fixing seat 12 drives the fixing bar 13 and the fixing pin 14 to move together, until the fixing bar 13 penetrates the valve cover 2 and docks with the valve body 1, and the fixing pin 14 docks with the valve body 1. After that, it can be reinforced with bolts, and then the valve body 1 is fixed, and then the valve cover 2 is limited in the vertical and horizontal directions, and then the stability of the valve cover 2 when it is fixed is improved, so that when the sealing structure of the valve stem is used, it plays a role in facilitating the stable fixation of the valve cover 2.

[0030] In actual use, the sealing structure for the valve stem achieves a sealing effect by compacting the contact surface between the stuffing tube 4 and the rod and sleeve, thereby preventing the medium in the valve body 1 from leaking from the position of the valve stem body 3 and the valve cover 2. This is a prior art and will not be elaborated on here. Multiple sealing points are formed by the stuffing tube 4, the sealing ring 6, the rubber sealing seat 9 and the sealing ring 10, thereby improving the sealing performance of the sealing structure. When a sealing point fails, other sealing points can continue to seal to prevent leakage, thereby improving the reliability of the seal. When the sealing structure of the valve stem is used, it plays a role in facilitating stable sealing, and by limiting the valve cover 2 in the vertical and horizontal directions, the stability of the valve cover 2 when it is fixed is improved.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a valve stem, characterized in that: The sealing structure for the valve stem comprises: a valve body (1), a valve cover (2) and a valve stem body (3); the top end of the valve body (1) is butted against the valve cover (2), and the inside of the valve cover (2) is slidably connected to the valve stem body (3).

2. A sealing structure for a valve stem according to claim 1, characterized in that: The valve body (1) is internally connected to a packing cylinder (4), and the top end of the packing cylinder (4) is butt-jointed with a packing pressure plate (5).

3. A sealing structure for a valve stem according to claim 2, characterized in that: The top end of the packing pressure plate (5) is connected to a sealing ring (6), and the inner wall of the sealing ring (6) is connected to a coil spring (7).

4. A sealing structure for a valve stem according to claim 3, characterized in that: The outer wall of the sealing ring (6) is connected to a pressing seat (8), and the pressing seat (8) is connected to a rubber sealing seat (9) via a clamping groove.

5. A sealing structure for a valve stem according to claim 4, characterized in that: The interior of the valve cover (2) is connected to a sealing ring (10) via a sealing cavity.

6. A sealing structure for a valve stem according to claim 1, characterized in that: The two sides of the bottom end of the valve cover (2) are butted against limit pins (11), and the two sides of the outer wall of the valve body (1) are connected to fixed seats (12).

7. A sealing structure for a valve stem according to claim 6, characterized in that: A fixing strip (13) is butt-jointed at the top end of the fixing seat (12), and a fixing pin (14) is welded to the middle portion of the outer wall of the fixing seat (12).

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