Compact dust-proof stuffing box for straight stroke

Abstract

The utility model belongs to valve technical field especially compact dustproof packing gland for straight stroke, including packing gland body, be equipped with valve stem in packing gland body, the utility model discloses a packing gland provides reliable dustproof and auxiliary sealing function for packing gland, is equipped with the packing between the one side of sealing ring and the one side of packing spring, and packing is compacted under the action of packing gland, further enhanced the sealing performance of packing gland, and the common constitution of sealing ring has formed multiple sealed defense line, improved the sealed reliability and stability of product, and packing gland connects with packing gland body through fine tooth thread to guarantee the sealing effect, when packing gland is screwed in, and the bayonet lock is inserted into the corresponding positioning slot, and packing gland is limited, prevents packing gland from being pushed out when medium pressure is higher, ensures that packing gland can stably press packing all the time, guarantees sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a compact dustproof stuffing box for linear stroke valves. Background Technology

[0002] In the field of industrial automation control, linear stroke valves, as a key fluid control device, are widely used in various processes. Their stability and reliability play a crucial role in the normal operation of the entire production system. The stuffing box in a linear stroke valve is one of the core components ensuring the valve's sealing performance; its main function is to prevent leakage of the internal medium, ensuring the safety and stability of the process.

[0003] However, due to the operating characteristics of linear-stroke valves, the valve stem needs to frequently reciprocate to open and close the valve. This frequent movement causes relative friction and dynamic interaction between the valve stem and its surrounding environment, creating conditions for impurities to enter the stuffing box. On the one hand, the medium inside the valve may contain various solid particles, impurities, or chemical substances. During the reciprocating motion of the valve stem, these impurities are easily adsorbed onto the surface of the valve stem and carried into the stuffing box along with the movement of the valve stem. On the other hand, the working environment of the valve is often complex. Dust, dirt, moisture, and other impurities in the external environment may also adhere to the valve stem during its movement and enter the stuffing box. Over time, these impurities accumulate in the stuffing box, rubbing and interacting with the packing, valve stem, and other related parts inside the stuffing box. This causes the parts inside the stuffing box to gradually wear down. The wear of the parts will damage the original sealing structure of the stuffing box, making it unable to fit tightly against the valve stem, thus greatly reducing the sealing performance of the stuffing box and ultimately failing to effectively prevent medium leakage, affecting the normal operation of the valve. In addition, the vibration generated by the frequent reciprocating motion of the valve stem and the influence of medium pressure fluctuations can also cause the packing gland to loosen. Loosening of the packing gland can further compromise the sealing effect of the stuffing box, making it easier for the medium to leak out from the packing. Therefore, we propose a compact, dustproof stuffing box for linear applications to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a compact, dustproof stuffing box for linear stroke applications, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A compact, dustproof stuffing box for linear stroke includes a stuffing box body. A valve stem is housed within the stuffing box body, and a packing spring is fitted onto the valve stem. Sealing rings are provided on the top and bottom inner walls of the stuffing box body. Packing is provided between one side of the sealing ring and one side of the packing spring. A packing gland is connected to the top of the stuffing box body via a fine-pitch thread. Multiple positioning grooves are annularly formed on the packing gland. A support ring is fixedly connected to the stuffing box body. Two T-shaped rods are welded to the bottom of the support ring. A common moving ring is slidably connected to the two T-shaped rods. Two hinge rods are rotatably connected to the top of the moving ring. Two blocks are fixedly connected to the top of the stuffing box body. Each block has a locking pin, which engages with one of the multiple positioning grooves. A connecting ring is welded to the locking pin. A first tension spring is fixedly connected between one side of the connecting ring and one side of the corresponding block. The end of the hinge rod is hinged to the bottom of the corresponding locking pin. The valve stem passes through the interior of the sealing ring, the packing gland, and the stuffing box body.

[0009] Furthermore, the first tension spring is movably sleeved on the corresponding locking pin, and the support ring has two limiting grooves with openings on both sides.

[0010] Furthermore, the inner wall of the limiting groove does not contact the outer side of the corresponding hinge rod, and the hinge rod is inclined.

[0011] Furthermore, a second tension spring is fixedly connected between the top of the movable ring and the bottom of the support ring, and the second tension spring is movably sleeved on the corresponding T-shaped rod.

[0012] Furthermore, the block is provided with a guide hole, and the block is slidably connected to the corresponding locking pin through the guide hole.

[0013] Furthermore, the sealing ring adopts a double-lip design, and the sealing ring is tightly fitted to the inner wall of the valve stem and the stuffing box body, respectively.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a compact dustproof stuffing box for linear stroke applications, which has the following advantages:

[0016] This invention provides reliable dustproof and auxiliary sealing functions for the stuffing box by providing double-lip sealing rings on both the top and bottom inner walls of the stuffing box body. A packing material is placed between one side of the sealing ring and the other side of the packing spring. The packing material is compacted under the action of the packing gland, further enhancing the sealing performance of the stuffing box. Together with the sealing rings, it forms multiple sealing lines, improving the sealing reliability and stability of the product. The packing gland is connected to the stuffing box body via fine-pitch threads, pressing the packing material tightly to ensure a good seal. After the packing gland is screwed in, a locking pin engages in the corresponding positioning groove, limiting the packing gland and preventing it from being pushed out when the medium pressure is high. This ensures that the packing gland can always stably press down on the packing material, guaranteeing a good seal. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the cut-open stuffing box body of this utility model;

[0019] Figure 3 This utility model Figure 1 A schematic diagram of a partially tilted three-dimensional structure;

[0020] Figure 4 This utility model Figure 2 A schematic diagram of a partial three-dimensional structure.

[0021] In the diagram: 1. Stuffing gland body; 2. Valve stem; 3. Stuffing spring; 4. Sealing ring; 5. Stuffing; 6. Stuffing gland; 7. Positioning groove; 8. T-shaped rod; 9. Moving ring; 10. Support ring; 11. Block; 12. Locking pin; 13. Connecting ring; 14. First tension spring; 15. Hinge rod; 16. Second tension spring; 17. Limiting groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example

[0024] like Figure 1-4As shown, an embodiment of this utility model discloses a compact dustproof stuffing box for linear stroke, comprising a stuffing box body 1, a valve stem 2 inside the stuffing box body 1, a stuffing spring 3 sleeved on the valve stem 2, sealing rings 4 on the top and bottom inner walls of the stuffing box body 1, and stuffing 5 between one side of the sealing ring 4 and one side of the stuffing spring 3. A stuffing cap 6 is connected to the top of the stuffing box body 1 by a fine thread, and multiple positioning grooves 7 are formed in a ring on the stuffing cap 6. A support ring 10 is fixedly connected to the stuffing box body 1, and two T-shaped rods 8 are welded to the bottom of the support ring 10. The same moving ring 9 is slidably connected to the two T-shaped rods 8, and two hinge rods 15 are rotatably connected to the top of the moving ring 9. Two blocks 11 are fixedly connected to the top of the stuffing box body 1, and a locking pin 12 is provided on the block 11. The locking pin 12 engages with one of the positioning grooves 7, and a connecting ring 13 is welded to the locking pin 12. One side of the connecting ring 13 is fixedly connected to one side of the corresponding block 11. A first tension spring 14 is connected to the end of the hinge rod 15, which is hinged to the bottom of the corresponding locking pin 12. The valve stem 2 passes through the interior of the sealing ring 4, the packing gland 6, and the stuffing box body 1. The top and bottom inner walls of the stuffing box body 1 are provided with sealing rings 4 with a double lip design, which provide reliable dustproof and auxiliary sealing functions for the stuffing box. A packing 5 is provided between one side of the sealing ring 4 and one side of the packing spring 3. The packing 5 is compacted under the action of the packing gland 6, which further enhances the sealing performance of the stuffing box. Together with the sealing ring 4, it forms multiple sealing defenses, which improves the sealing reliability and stability of the product. The packing gland 6 is connected to the stuffing box body 1 through fine thread, pressing the packing 5 to keep it in a tight state, thereby ensuring the sealing effect. When the packing gland 6 is screwed in, the locking pin 12 is engaged in the corresponding positioning groove 7 to limit the packing gland 6 and prevent the packing gland 6 from being pushed out when the medium pressure is high. This ensures that the packing gland 6 can always stably press the packing 5 and ensure the sealing effect.

[0025] In some embodiments, the first tension spring 14 is movably sleeved on the corresponding locking pin 12, and the support ring 10 has two limiting grooves 17 with openings on both sides, and the locking pin 12 further fixes the ring.

[0026] In some embodiments, the inner wall of the limiting groove 17 does not contact the outer side of the corresponding hinge rod 15, and the hinge rod 15 is inclined.

[0027] In some embodiments, a second tension spring 16 is fixedly connected between the top of the movable ring 9 and the bottom of the support ring 10. The second tension spring 16 is movably sleeved on the corresponding T-shaped rod 8, and the T-shaped rod 8 serves a positioning function.

[0028] In some embodiments, a guide hole is provided on the block 11, and the block 11 is slidably connected to the corresponding locking pin 12 through the guide hole.

[0029] In some embodiments, the sealing ring 4 adopts a double-lip design, and the sealing ring 4 is tightly fitted to the inner wall of the valve stem 2 and the stuffing box body 1 respectively. This double-lip rubber sealing ring 4 has a dual sealing effect. On the one hand, its unique double-lip structure can effectively prevent the substances inside the medium from leaking to the outside. On the other hand, it can also prevent external impurities and dust from entering the stuffing box, greatly reducing the possibility of the medium and external impurities and dust entering the stuffing box.

[0030] In terms of working principle or structural principle, during use, sealing rings 4 with double-lip design are provided on the top and bottom inner walls of the stuffing box body 1, providing reliable dustproof and auxiliary sealing functions for the stuffing box. Packing 5 is provided between one side of the sealing ring 4 and one side of the packing spring 3. The packing 5 is compacted under the action of the packing gland 6, further enhancing the sealing performance of the stuffing box. Together with the sealing ring 4, it forms multiple sealing lines, improving the sealing reliability and stability of the product. The packing gland 6 is connected to the stuffing box body 1 through fine-pitch threads, pressing the packing 5 to maintain a tight seal, thus ensuring the sealing effect. When the packing gland 6 is screwed in, the locking pin 12 engages with the corresponding positioning groove. In section 7, the packing gland 6 is limited to prevent it from being pushed out when the medium pressure is high, ensuring that the packing gland 6 can always stably press the packing 5 and guarantee the sealing effect. When it is necessary to remove the packing gland 6, the second tension spring 16 is compressed by moving the moving ring 9. The moving ring 9 drives the hinge rod 15 to move, and the hinge rod 15 in turn drives the locking pin 12 to move outward, so that the locking pin 12 is disengaged from the positioning groove 7. At this time, the packing gland 6 can be unscrewed. After the moving ring 9 is released, the moving ring 9 returns to its original position under the elastic reset action of the second tension spring 16. At the same time, the locking pin 12 also returns to its initial position under the action of the first tension spring 14, which facilitates the locking when installing the packing gland 6 next time.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compact, dustproof stuffing box for linear stroke applications, comprising a stuffing box body (1), characterized in that: The stuffing box body (1) is provided with a valve stem (2), and a packing spring (3) is sleeved on the valve stem (2). The top and bottom inner walls of the stuffing box body (1) are provided with sealing rings (4). A packing (5) is provided between one side of the sealing ring (4) and one side of the packing spring (3). The top of the stuffing box body (1) is connected to a packing gland (6) by a fine thread. The packing gland (6) has multiple positioning grooves (7) in a ring. A support ring (10) is fixedly connected to the stuffing box body (1). Two T-shaped rods (8) are welded to the bottom of the support ring (10). The same moving ring (9) is slidably connected to the two T-shaped rods (8). The top of the moving ring (9) is rotatably connected to two hinge rods (15), and the top of the stuffing box body (1) is fixedly connected to two blocks (11). The blocks (11) are provided with a locking pin (12). The locking pin (12) is engaged with one of the positioning slots (7) among a plurality of positioning slots (7). A connecting ring (13) is welded on the locking pin (12). A first tension spring (14) is fixedly connected between one side of the connecting ring (13) and one side of the corresponding block (11). The end of the hinge rod (15) is hinged to the bottom of the corresponding locking pin (12). The valve stem (2) passes through the interior of the sealing ring (4), the packing gland (6), and the stuffing box body (1).

2. The compact dustproof stuffing box for linear stroke as described in claim 1, characterized in that: The first tension spring (14) is movably sleeved on the corresponding locking pin (12), and the support ring (10) has two limiting grooves (17) with openings on both sides.

3. The compact dustproof stuffing box for linear stroke according to claim 2, characterized in that: The inner wall of the limiting groove (17) does not contact the outer side of the corresponding hinge rod (15), and the hinge rod (15) is inclined.

4. The compact dustproof stuffing box for linear stroke according to claim 3, characterized in that: A second tension spring (16) is fixedly connected between the top of the movable ring (9) and the bottom of the support ring (10), and the second tension spring (16) is movably sleeved on the corresponding T-shaped rod (8).

5. The compact dustproof stuffing box for linear stroke according to claim 4, characterized in that: The block (11) has a guide hole, and the block (11) is slidably connected to the corresponding locking pin (12) through the guide hole.

6. The compact dustproof stuffing box for linear stroke according to claim 5, characterized in that: The sealing ring (4) adopts a double lip design, and the sealing ring (4) is tightly fitted to the valve stem (2) and the inner wall of the stuffing box body (1).

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