A sealed and stable pneumatic regulating valve

Abstract

This utility model discloses a pneumatic regulating valve with stable sealing. The key technical features include a valve body, valve seat, valve core, and valve stem. The valve core includes a sliding part and a blocking part. The sliding part has multiple pressure-balancing holes. The valve seat includes a flow part and a receiving part. A step is formed at the connection between the receiving part and the flow part. A buffer spring is sleeved on the blocking part. A sealing part with an inner diameter larger than the outer diameter of the sliding part is provided on the inner wall of the receiving part. The sealing part is connected to the step. The buffer spring is located in the inner cavity of the sealing part. A soft sealing ring that fits against the sealing part is sleeved on the sliding part. An extension part is provided on the surface of the sliding part facing the valve body opening, sleeved on the valve stem. A pushing component is provided outside the extension part to push the soft sealing ring towards the sealing part. An adjusting component located above the pushing component is threadedly connected to the extension part. After a hard seal is formed between the blocking part and the flow part, the problems of poor sealing between the valve core and valve seat and difficulty in replacing the sealing component in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and more specifically to a pneumatic regulating valve with stable sealing. Background Technology

[0002] Our company currently has a Chinese patent application number 2021221408923 that discloses a pneumatic regulating valve. It uses a buffer spring fitted over the blocking part, with both ends of the spring contacting the valve seat and the sliding part respectively, to reduce the impact force when the valve core moves towards the valve seat. Simultaneously, a sealing element is provided on the inner wall of the valve seat. The sliding part fits against the sealing element, and the blocking part fits against the flow part, forming a seal between the valve core and the valve seat. While this solves the problem of reduced sealing performance due to the large impact force of the valve core on the valve seat, it still has shortcomings. The valve core structure in the prior art is one-piece and has fixed dimensions. If the sealing element is... If the valve seat inner wall is formed in one piece, there is a possibility that due to processing errors, the sliding part and the seal may not be properly fitted when the blocking part and the flow part are properly fitted. This can cause the medium to flow through the pressure balancing hole to the top of the valve core and then through the gap between the sliding part and the seal, resulting in leakage. If the seal is made of a soft material and positioned on the inner wall of the valve seat, there is a problem with the seal being difficult to install and remove. Moreover, under long-term use, the valve core may scrape against the seal repeatedly, causing the seal to fall off the inner wall of the valve seat, ultimately leading to leakage. In both of these cases, the valve seat and valve core cannot close completely, resulting in medium leakage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pneumatic regulating valve that allows for full closure of the valve core and valve seat and is easy to maintain.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealed and stable pneumatic regulating valve, comprising a valve body, a valve seat positioned within the valve body, a valve core slidably connected within the valve seat, and a valve stem that drives the valve core to move up and down. The valve core includes a sliding part connected to the valve stem and a hollow blocking part coaxial with the sliding part. The sliding part is provided with multiple pressure-balancing holes. The valve seat includes a flow part with an inner diameter matching the outer diameter of the blocking part and a receiving part with an inner diameter larger than the inner diameter of the flow part. A step is formed at the connection between the receiving part and the flow part. A buffer spring is sleeved on the blocking part and limited between the step and the sliding part. A buffer spring is provided on the inner wall of the receiving part to prevent the blocking part from moving up and down. A sealing part is coaxial with the sliding part and has an inner diameter larger than the outer diameter of the sliding part. One end of the sealing part is connected to a step. The buffer spring is located in the inner cavity of the sealing part. The sliding part is fitted with a soft sealing ring that can fit against one end of the sealing part. An extension is provided on the surface of the sliding part facing the valve body opening and is fitted outside the valve stem. A pushing component is provided outside the extension to push the soft sealing ring towards the sealing part. The extension is threadedly connected to an adjusting component located above the pushing component. After the blocking part and the flow part form a hard seal, the pushing component is moved downward by rotating the adjusting component, so that the soft sealing ring moves downward synchronously with the pushing component and forms a soft seal with the sealing part.

[0005] As a further improvement of this utility model, the pushing component includes a linkage ring sleeved outside the extension and able to fit against the lower surface of the adjusting member, multiple connecting rods circumferentially distributed around the axis of the linkage ring and one end of each rod connected to the outer wall of the linkage ring, a push ring sleeved outside the sliding part and able to fit against the soft sealing ring, and multiple connecting columns that sequentially connect the multiple connecting rods to the push ring. By pushing the linkage ring downward by the adjusting member, the connecting rods, connecting columns and push ring move downward as a whole, thereby pushing the soft sealing ring downward.

[0006] As a further improvement of this utility model, the outer wall of the sliding part is provided with a plurality of semi-grooves for partial accommodation of a plurality of connecting columns, and the plurality of connecting rods are staggered from the plurality of pressure-balancing holes.

[0007] As a further improvement of this utility model, the pushing assembly also includes a rib ring with a diameter between the linkage ring and the push ring, which connects multiple connecting rods.

[0008] As a further improvement of this utility model, a limiting ring with an outer diameter smaller than the inner diameter of the sealing part is provided outside the sliding part, and the limiting ring is located below the soft sealing ring.

[0009] As a further improvement of this utility model, two slots located on the same diameter of the adjusting member are provided on the outer wall of the adjusting member.

[0010] As a further improvement of this utility model, one end of each of the two slots extends to the outer wall of the adjusting member along the diameter of the adjusting member.

[0011] As a further improvement of this utility model, the surfaces of the soft sealing ring and the sealing part that are in contact with each other are both inclined relative to the horizontal plane.

[0012] The beneficial effects of this utility model are as follows: After a hard seal is formed between the blocking part and the flow part, the pushing component is moved downward by rotating the adjusting component, so that the soft sealing ring moves downward synchronously with the pushing component and forms a soft seal with the sealing part. Compared with the prior art, this design can make up for the defect that the valve core and valve seat cannot be effectively closed due to processing errors, and ensure the sealing stability of the valve core and valve seat when they are closed; the operation of replacing the soft sealing ring is simpler and the maintenance efficiency is improved. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the present invention when it is closed; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a diagram showing the state of the adjusting component of this utility model when it is rotated with the aid of a tool; Figure 4 for Figure 3 A 3D view after removing the valve body, valve seat, and valve stem; Figure 5 for Figure 4 Exploded view after removing the tool.

[0014] Reference numerals: 1. Valve body; 2. Valve seat; 21. Flow section; 22. Receiving section; 23. Sealing section; 3. Valve core; 31. Sliding section; 32. Blocking section; 33. Pressure balancing hole; 34. Extension section; 35. Semi-groove; 36. Limiting ring; 4. Valve stem; 5. Buffer spring; 6. Soft sealing ring; 7. Push assembly; 71. Linkage ring; 72. Connecting rod; 73. Push ring; 74. Connecting column; 75. Rib ring; 8. Adjusting component; 81. Slot. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0016] Reference Figures 1 to 5As shown, a sealed and stable pneumatic regulating valve of this embodiment includes a valve body 1, a valve seat 2 positioned in the valve body 1, a valve core 3 slidably connected in the valve seat 2, and a valve stem 4 that drives the valve core 3 to move up and down. The valve core 3 includes a sliding part 31 connected to the valve stem 4 and a blocking part 32 coaxial with the sliding part 31 and hollow. The sliding part 31 is provided with a plurality of pressure balancing holes 33. The valve seat 2 includes a flow part 21 with an inner diameter matching the outer diameter of the blocking part 32 and a receiving part 22 with an inner diameter larger than the inner diameter of the flow part 21. A step is formed at the connection between the receiving part 22 and the flow part 21. A buffer spring 5 is provided on the blocking part 32 and limited to the step and the sliding part 31. Based on the aforementioned prior art, during the machining of the inner wall of the valve seat 2, a flow section 21, a sealing section 23, and a receiving section 22 are sequentially formed from bottom to top by cutting a hole with a varying inner diameter. The inner diameter of the flow section 21 matches the outer diameter of the blocking section 32. The inner diameter of the sealing section 23 is larger than the outer diameter of the sliding section 31. The outer diameter of the soft sealing ring 6 is larger than the inner diameter of the sealing section 23. The height of the soft sealing ring 6 is smaller than the height of the sliding section 31. An extension section 34 coaxial with the sliding section 31 is integrally formed on the surface of the sliding section 31 that is not connected to the blocking section 32. The inner cavity of the extension section 34 communicates with the inner cavity of the sliding section 31. An external thread is machined on the outer wall of the extension section 34 and is located away from the sliding section 31. The push assembly 7 includes a linkage ring 71, multiple connecting rods 72, a push ring 73, and connecting posts 74 in the same number as the connecting rods 72. The inner diameter of the linkage ring 71 is larger than the outer diameter of the extension 34. The outer diameter of the linkage ring 71 is smaller than the diameter of the circumference of the multiple pressure-balancing holes 33. One end of each of the multiple connecting rods 72 is welded to the outer wall of the linkage ring 71 and is distributed circumferentially around the axis of the linkage ring 71. The length direction of each of the multiple connecting rods 72 is parallel to the diameter direction of the linkage ring 71. The diameter of the circumference of the ends of the multiple connecting rods 72 away from the linkage ring 71 is larger than the outer diameter of the sliding part 31. Multiple connecting posts 74 are sequentially welded to the lower part of the ends of the multiple connecting rods 72 away from the linkage ring 71. The length direction of the connecting posts 74 is parallel to the axis of the linkage ring 71. The inner diameter of the push ring 73 is greater than or equal to the outer diameter of the sliding part 31. The ends of the multiple connecting posts 74 that are not connected to the connecting rods 72 are welded to the upper surface of the push ring 73. The adjusting part 8 can be any ring body with internal threads, such as a nut. During assembly, the soft sealing ring 6 is fitted over the sliding part 31, with a height difference between the upper surface of the soft sealing ring 6 and the upper surface of the sliding part 31. The soft sealing ring 6 is tightened around the sliding part 31 by its own elasticity, with a small tightening force, to facilitate the movement of the soft sealing ring 6 relative to the sliding part 31. Then, the linkage ring 71 is fitted over the extension part 34 and moved downwards until the push ring 73 is fitted over the sliding part 31 and fits against the upper surface of the soft sealing ring 6. Multiple connecting posts 74 are located around the sliding part 31, and multiple connecting rods 72 and the linkage ring 71 are located above the sliding part 31 and adjacent to the sliding part 31. 1. A gap exists on the upper surface. Then, the adjusting member 8 is screwed onto the extension 34 with a gap between it and the linkage ring 71. The pushing assembly 7 is then limited between the soft sealing ring 6 and the adjusting member 8. Next, one end of the valve stem 4 passes through the extension 34 and the sliding part 31 successively and is tightened with a nut on the outside of the valve stem 4 so that the valve stem 4 is fixedly connected to the valve core 3. Then, the buffer spring 5 is sleeved on the outside of the blocking part 32 and the valve core 3 is placed in the valve body 1 with the valve seat 2. The buffer spring 5 moves into the sealing part 23. If the soft sealing ring 6 is in contact with the upper end face of the sealing part 23 and the blocking part 32 is not connected to the flow part 21, When the valve stem 4 is in contact with the valve core 3, a downward force is applied to the valve stem 4, causing the valve core 3 to move downward. The sealing part 23 pushes the soft sealing ring 6 and the pushing assembly 7 to move upward relative to the sliding part 31. The distance between the linkage ring 71 and the adjusting member 8 decreases until the flow part 21 and the blocking part 32 form an effective hard seal. The valve core 3 can no longer move downward relative to the valve seat 2. The force applied to the valve stem 4 is released, and the adjusting member 8 is rotated so that it moves downward relative to the extension part 34 and presses against the linkage ring 71. The pushing assembly 7 is clamped by the soft sealing ring 6 and the adjusting member 8 and cannot move. If the soft sealing ring 6 and the sealing part 23 are in contact with the valve core 3, the valve core 3 can no longer move. If the upper end face is not in contact with the sealing part 32 and the flow part 21 are in place, rotate the adjusting member 8. The adjusting member 8 moves downward relative to the extension part 34 and touches the linkage ring 71. As the adjusting member 8 continues to move downward, it pushes the component 7 and the soft sealing ring 6 to move downward relative to the sliding part 31 until the soft sealing ring 6 is in contact with the upper end face of the sealing part 23 to form a soft seal. Then stop rotating the adjusting member 8. After the soft sealing ring 6 and the sealing part 23 can form a soft seal and the flow part 21 and the sealing part 32 can form a hard seal, install the valve cover, pneumatic actuator, etc. on the valve body 1 in sequence. Each time the valve is closed, the soft sealing ring 6 and the sealing part 23 form a soft seal, and the flow part 21 and the blocking part 32 form a hard seal. If the soft sealing ring 6 wears down during maintenance, causing the soft seal to fail, the soft seal can be restored by rotating the adjusting component 8 again to move the soft sealing ring 6 downward. If the soft sealing ring 6 is aged or severely damaged, the adjusting component 8, the pushing component 7 and the damaged soft sealing ring 6 can be removed in sequence, and then the new soft sealing ring 6, the pushing component 7 and the adjusting component 8 can be installed back onto the valve core 3 in sequence for reuse. Compared with existing technologies, this design can compensate for the defect that the valve core 3 and valve seat 2 cannot be effectively closed due to processing errors, and ensure the sealing stability of the valve core 3 and valve seat 2 when closed; it is also easier to replace the soft sealing ring 6, and improves maintenance efficiency.

[0017] As an improved specific implementation, during the rotation of the adjusting member 8 relative to the pushing component 7, the pushing component 7 will rotate with the adjusting member 8 under the action of friction. This will accelerate the wear between the push ring 73 and the soft sealing ring 6. At the same time, the connecting rod 72 will move directly above the pressure-balancing hole 33. During the closing process, the medium will flow through the pressure-balancing hole 33 and impact the connecting rod 72, accelerating the breakage of the connecting rod 72. To solve the aforementioned problems, refer to Figure 4 and Figure 5 As shown, multiple semi-grooves 35 are machined at the edge of the upper surface of the sliding part 31, which are respectively partially accommodated by the connecting post 74. After the induction assembly 7 is installed on the valve core 3, the multiple connecting posts 74 are respectively inserted into the corresponding semi-grooves 35. At this time, the multiple connecting rods 72 are staggered from the multiple pressure-balancing holes 33. This design can avoid the phenomenon of the pushing assembly 7 rotating relative to the sliding part 31, ensuring the stability of the connection between the pushing assembly 7 and the sliding part 31, and indirectly ensuring the structural stability of the connecting rod 72.

[0018] As an improved specific implementation, as the size of the valve core 3 increases, the length of the connecting rod 72 increases. When the pushing assembly 7 presses down on the soft sealing ring 6, the two ends of the connecting rod 72 experience different forces, making it prone to breakage. To solve the aforementioned problem, refer to... Figure 4 and Figure 5 As shown, the push assembly 7 also includes a rib ring 75 with a diameter between the linkage ring 71 and the push ring 73, which connects multiple links 72. This design can improve the structural strength of the multiple links 72 by connecting them.

[0019] As one specific implementation of the improvement, the soft sealing ring 6 is prone to aging and easily detaches directly from the sliding part 31, affecting normal use and maintenance. To solve the aforementioned problem, refer to Figure 2 , Figure 4 and Figure 5 As shown, a limiting ring 36 with an outer diameter smaller than the inner diameter of the sealing part 23 is integrally formed on the outside of the sliding part 31. The limiting ring 36 is located below the soft sealing ring 6. This design can prevent the soft sealing ring 6 from falling off the sliding part 31 and indirectly improve the connection stability of the soft sealing ring 6.

[0020] As an improved specific implementation, as the depth of the valve core 3 within the valve body 1 increases or the size of the valve core 3 becomes larger, it becomes difficult for assembly workers to directly and manually adjust the adjusting component 8 within the valve body 1. To solve the aforementioned problem, refer to... Figure 2 , Figure 4 and Figure 5 As shown, two slots 81 located on the same diameter are provided on the outer wall of the adjusting component 8. Two uprights are inserted into the two slots 81 respectively, and the other ends of the two uprights are located outside the valve body 1. Then, one end of a long handle is sleeved on the valve stem 4 and simultaneously sleeved on the ends of the two uprights. By applying a pushing force to the long handle, the uprights and the adjusting component 8 are rotated as a whole. This design facilitates the adjustment of the adjusting component 8 and improves the efficiency of disassembly and assembly.

[0021] As one specific implementation of the improvement, impurities in the medium can accumulate inside the slot 81, hindering the insertion of the upright into the slot 81 and affecting the assembly / disassembly efficiency. To solve the aforementioned problem, refer to... Figure 5 As shown, one end of each slot 81 extends to the outer wall of the adjusting member 8 along with the diameter of the adjusting member 8. This design ensures that impurities flow out of the slot 81 with the medium or cleaning water, which facilitates the insertion of the upright into the slot 81 and drives the adjusting member 8 to rotate, thereby indirectly improving the efficiency of disassembly and assembly.

[0022] As one specific implementation method of the improvement, refer to Figure 2 As shown, the surfaces of the soft sealing ring 6 and the sealing part 23 that are in contact with each other are inclined relative to the horizontal plane. Compared with the design where the surfaces of the soft sealing ring 6 and the sealing part 23 are in contact with each other are horizontal, this design can increase the sealing area and improve the sealing performance. At the same time, it can also improve the coaxiality between the soft sealing ring 6 and the sliding part 31 and delay the speed at which the tightening force of the soft sealing ring 6 fails.

[0023] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A sealed and stable pneumatic regulating valve, comprising a valve body (1), a valve seat (2) positioned within the valve body (1), a valve core (3) slidably connected within the valve seat (2), and a valve stem (4) for moving the valve core (3) up and down, wherein the valve core (3) includes a sliding part (31) connected to the valve stem (4) and a blocking part (32) coaxial with and hollow from the sliding part (31), wherein the sliding part (31) is provided with a plurality of pressure-balancing holes (33), wherein the valve seat (2) includes a flow part (21) whose inner diameter matches the outer diameter of the blocking part (32) and a receiving part (22) whose inner diameter is larger than the inner diameter of the flow part (21), wherein a step is formed at the junction of the receiving part (22) and the flow part (21), and a buffer spring (5) located between the step and the sliding part (31) is sleeved on the blocking part (32), characterized in that: The inner wall of the receiving part (22) is provided with a sealing part (23) that is coaxial with the blocking part (32) and has an inner diameter larger than the outer diameter of the sliding part (31). One end of the sealing part (23) is connected to the step. The buffer spring (5) is located in the inner cavity of the sealing part (23). The sliding part (31) is covered with a soft sealing ring (6) that can fit against one end of the sealing part (23). The sliding part (31) has an extension that is sleeved on the surface facing the opening direction of the valve body (1) and is sleeved on the valve stem (4). (34) The extension (34) is provided with a pushing component (7) that can push the soft sealing ring (6) towards the sealing part (23). The extension (34) is threadedly connected to an adjusting component (8) located above the pushing component (7). After the blocking part (32) and the flow part (21) form a hard seal, the pushing component (7) is moved downward by rotating the adjusting component (8) so that the soft sealing ring (6) moves downward synchronously with the pushing component (7) and forms a soft seal with the sealing part (23).

2. The pneumatic regulating valve with stable sealing according to claim 1, characterized in that: The pushing assembly (7) includes a linkage ring (71) sleeved on the extension (34) and able to fit against the lower surface of the adjusting member (8), multiple connecting rods (72) arranged circumferentially around the axis of the linkage ring (71) and one end of each rod connected to the outer wall of the linkage ring (71), a push ring (73) sleeved on the sliding part (31) and able to fit against the soft sealing ring (6), and multiple connecting posts (74) that sequentially connect multiple connecting rods (72) and push ring (73). The adjusting member (8) pushes the linkage ring (71) downward, causing the connecting rods (72), connecting posts (74) and push ring (73) to move downward as a whole and push the soft sealing ring (6) downward.

3. The pneumatic regulating valve with stable sealing according to claim 2, characterized in that: The outer wall of the sliding part (31) is provided with a plurality of semi-grooves (35) for partial accommodation of a plurality of connecting columns (74), and the plurality of connecting rods (72) are offset from the plurality of pressure-balancing holes (33).

4. The pneumatic regulating valve with stable sealing according to claim 2, characterized in that: The push assembly (7) also includes a rib ring (75) with a diameter between the linkage ring (71) and the push ring (73) and connecting multiple links (72).

5. A sealed and stable pneumatic regulating valve according to claim 1, 2, 3, or 4, characterized in that: The sliding part (31) is provided with a limiting ring (36) whose outer diameter is smaller than the inner diameter of the sealing part (23), and the limiting ring (36) is located below the soft sealing ring (6).

6. A sealed and stable pneumatic regulating valve according to claim 1, 2, 3, or 4, characterized in that: The outer wall of the adjusting member (8) is provided with two slots (81) located on the same diameter of the adjusting member (8).

7. A sealed and stable pneumatic regulating valve according to claim 6, characterized in that: Both of the slots (81) extend to the outer wall of the adjustment member (8) at one end in the diameter of the adjustment member (8).

8. A sealed and stable pneumatic regulating valve according to claim 1, 2, 3, or 4, characterized in that: The surfaces of the soft sealing ring (6) and the sealing part (23) that are in contact with each other are inclined relative to the horizontal plane.

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