Manual corrugated pipe valve

Abstract

The invention belongs to the technical field of corrugated pipe valves, and particularly relates to a manual corrugated pipe valve which comprises a valve body. The valve head is arranged on the valve body; the split circular ring is arranged in the valve head; the valve head nut is connected with the valve head; the valve rod is positioned in the valve body; the corrugated pipe is welded in the valve body; the corrugated pipe lower cover is positioned at the bottom end of the corrugated pipe; the corrugated pipe upper cover is positioned at the top end of the corrugated pipe; the packing sealing structure is fixed through a full-thread bolt, comprises packing and a packing pressing plate, and is pressed by a nut; a bolt gasket; the plane roller pin thrust bearing is mounted through a full-thread bolt and a nut; a valve rod nut; a bearing gland; a hand wheel; the hand wheel nut is used for locking the hand wheel at the top end of the valve rod; a main seal is formed between the valve rod and the corrugated pipe, the packing seal structure is arranged around the valve rod to form a standby secondary seal, a dual-seal system is jointly formed, and the manual corrugated pipe valve solves the problem of medium leakage caused by insufficient sealing performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bellows valve, in particular to a manual bellows valve. BACKGROUND

[0002] The bellows valve is a pressure balanced regulating valve, which has compact structure and S-shaped fluid passage, and has small pressure drop loss, large flow and wide adjustable range. The bellows valve has a bellows sealing structure in the valve body, which can completely eliminate the possibility of process medium leakage from the movement gap of the valve stem to the outside, which is one of the significant features of the bellows sealing valve. Due to the deformation and excellent aging resistance of the bellows element, the regulating valve completely overcomes the weaknesses of packing aging and temperature difference sensitivity commonly existing in the packing sealing valve.

[0003] The existing bellows valve is mainly executed by pneumatic, which has high maintenance cost. At the same time, the sealing effect of the bellows or packing is poor, which is easy to cause medium leakage, and further causes the problem of insufficient sealing in use. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification of the present application to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] Therefore, the purpose of the present application is to provide a manual bellows valve, which replaces the traditional bellows valve and avoids the problem of insufficient sealing leading to medium leakage.

[0006] To solve the above technical problems, according to one aspect of the present application, the present application provides the following technical scheme:

[0007] A manual bellows valve, comprising:

[0008] a valve body, a valve head mounted on the valve body, a split ring arranged in the valve head, a valve head nut connected with the valve head, a valve stem located in the valve body, a bellows welded in the valve body, a bellows lower cover located at the bottom end of the bellows and a bellows upper cover located at the top end of the bellows, a bracket, a pin key, a packing sealing structure fixed by full thread bolts, the packing sealing structure comprising packing and packing pressing plate and being pressed by a nut, a bolt gasket, a plane needle thrust bearing installed by full thread bolts and nuts, a valve stem nut, a bearing pressing cover, a hand wheel, and a hand wheel nut for locking the hand wheel at the top end of the valve stem, wherein the valve stem and the bellows form a primary seal therebetween, and the packing sealing structure is arranged around the valve stem to form a backup secondary seal, which together constitute a double sealing system.

[0009] As a preferred embodiment of the manual bellows valve described in this invention, it further includes a valve body structure and a pre-sealing mechanism, a sealing locking and feedback mechanism, and a self-energizing sealing mechanism.

[0010] The valve body structure and pre-sealing mechanism include a valve body body, a valve stem body located inside the valve body body and having a sealing head at the top, a handwheel body installed at the top of the valve stem body, and a bellows body located inside the valve body body. When the handwheel body is turned, it drives the valve stem body to move downward quickly and automatically performs preliminary pre-sealing on the bellows body.

[0011] The sealing, locking and feedback mechanism is installed inside the valve body. When the valve body descends to a certain position, it automatically drives the sealing, locking and feedback mechanism to lock the pre-seal of the bellows body and provide immediate sound feedback on the tightness of the valve body.

[0012] The self-energizing sealing mechanism is installed inside the valve body. When the sealing locking and feedback mechanism is working, it automatically drives the self-energizing sealing mechanism to work and perform a tight hard seal around the bellows body.

[0013] In a preferred embodiment of the manual bellows valve described in this invention, the sealing head is connected to the bottom of the valve stem body via a flexible snap-fit ​​connector.

[0014] As a preferred embodiment of the manual bellows valve of the present invention, the top of the valve body is provided with a valve body cover plate having a lead nut inside by bolts.

[0015] The upper end of the outer side wall of the valve stem body has a large lead thread, and the side wall of the valve stem body is provided with a limit shoulder.

[0016] A bellows cover plate is welded to the top of the bellows body.

[0017] As a preferred embodiment of the manual bellows valve of the present invention, the sealing, locking and feedback mechanism includes a ratchet fixedly sleeved on the valve stem body, a plurality of elastic pawls evenly distributed on the outer side wall of the ratchet, and a feedback component installed in the valve body body and corresponding to the elastic pawls.

[0018] As a preferred embodiment of the manual bellows valve of the present invention, the inner wall of the valve body is provided with a coaxial arc-shaped moving groove.

[0019] The feedback component includes an arc-shaped sawtooth block slidably mounted in the arc-shaped moving groove and an elastic element located on one side of the arc-shaped sawtooth block.

[0020] As a preferred embodiment of the manual bellows valve of the present invention, the inner wall of the valve body is provided with an installation groove.

[0021] The self-energizing sealing mechanism includes an annular airbag installed in the mounting groove and a venting pipe with one end connected to the annular airbag and the other end connected to the arc-shaped moving groove.

[0022] As a preferred embodiment of the manual bellows valve of the present invention, the side wall of the arc-shaped moving groove is provided with a vent hole communicating with the vent pipe.

[0023] The sidewall of the arc-shaped sawtooth block is provided with an air guide column corresponding to the vent hole;

[0024] A one-way valve is installed in the ventilation pipeline.

[0025] In a preferred embodiment of the manual bellows valve described in this invention, the outer wall of the valve body is provided with a vent that communicates with the annular air bladder.

[0026] In a preferred embodiment of the manual bellows valve of the present invention, a bellows reinforcing ring is provided on the outer wall of the bellows body, and the bellows reinforcing ring corresponds to the annular airbag.

[0027] Compared with the prior art, the beneficial effect of this invention is that the various manual bellows valves use bellows as the main seal and packing as the secondary seal, so that even if the bellows fails, the packing can still prevent media leakage, thus achieving a double sealing effect. This replaces the traditional bellows valve and avoids the problem of media leakage caused by insufficient sealing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0029] Figure 1 This is a cross-sectional view of the structure of a manual bellows valve according to the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a manual bellows valve according to the present invention;

[0031] Figure 3 This is a structural exploded view of a manual bellows valve according to the present invention;

[0032] Figure 4 This is a structurally exploded view of the valve stem body and the sealing, locking and feedback mechanism of a manual bellows valve according to the present invention.

[0033] Figure 5 This is a cross-sectional view of the valve body of a manual bellows valve according to the present invention.

[0034] Figure 6 This is a cross-sectional view of the bellows body of a manual bellows valve of the present invention during pre-sealing.

[0035] Figure 7 This is a cross-sectional view of the sealing, locking, and feedback mechanism of a manual bellows valve according to the present invention during operation.

[0036] Figure 8 This is a cross-sectional view of the self-energizing sealing mechanism of a manual bellows valve of the present invention during valve locking.

[0037] In the diagram: 1. Valve body; 2. Valve head; 3. Split ring; 4. Valve head nut; 5. Valve stem; 6. Lower bellows cover; 7. Bellows; 8. Upper bellows cover; 9. Bracket; 10. Key; 11. Fully threaded bolt; 12. Nut; 13. Bolt washer; 14. Packing; 15. Packing gland; 16. Fully threaded bolt; 17. Nut; 18. Flat needle roller thrust bearing; 19. Valve stem nut; 20. Bearing gland; 21. Handwheel; 22. Handwheel nut; 100. Valve body structure and pre-sealing mechanism; 110. Valve body; 110a. Valve body cover plate; 110 b. Arc-shaped moving groove; 110b-1. Air guide hole; 110. Installation groove; 110d. Air vent; 120. Valve stem body; 120a. Sealing head; 120b. Large lead thread; 120c. Limiting shoulder; 130. Handwheel body; 140. Bellows body; 140a. Bellows cover plate; 200. Sealing locking and feedback mechanism; 210. Ratchet; 220. Elastic pawl; 230. Feedback assembly; 230a. Arc-shaped serrated block; 230a1. Air guide column; 230b. Elastic element; 300. Self-energizing sealing mechanism; 310. Annular airbag. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0041] This invention provides a manual bellows valve to replace the traditional bellows valve, avoiding the problem of medium leakage caused by insufficient sealing.

[0042] Figures 1-8 The diagram shown is a structural schematic of a manual bellows valve according to the present invention. Please refer to [link / reference]. Figures 1-8 This article provides a detailed introduction to this type of manual bellows valve.

[0043] Example 1

[0044] refer to Figure 1 This invention discloses a manual bellows valve, comprising: a valve body 1; a valve head 2 mounted on the valve body 1; a split ring 3 disposed within the valve head 2; a valve head nut 4 connected to the valve head 2; a valve stem 5 located within the valve body 2; a bellows 7 welded inside the valve body 1; a lower bellows cover 6 located at the bottom end of the bellows 7 and an upper bellows cover 8 located at the top end of the bellows 7; a bracket 9; a key 10; a packing seal structure fixed by fully threaded bolts 11, the packing seal structure comprising packing 14 and a packing pressure plate 15, and pressed by a nut 12; a bolt washer 13; a valve stem nut 19; a bearing cap 20; a handwheel 21; and a handwheel nut 22 locking the handwheel 21 to the top end of the valve stem 5; wherein, a primary seal is formed between the valve stem 5 and the bellows 7, and the packing seal structure is arranged around the valve 52 to form a backup secondary seal, together constituting a dual sealing system.

[0045] In this embodiment, the specific usage process is as follows: by rotating the handwheel 21, the valve stem 5 and the valve head 2 are moved downward to seal the valve body. During this process, a primary seal is formed between the bellows 7 and the valve stem 5, and a secondary seal is formed between the valve stem 5 and the packing 14. Thus, even if the bellows 7 fails, the secondary seal of the packing 14 can still play a sealing role, thereby achieving a double sealing effect and avoiding the occurrence of medium leakage due to insufficient sealing.

[0046] Example 2

[0047] Based on Example 1, and referring to Figures 2-8 It also includes a valve body structure and pre-sealing mechanism 100, a sealing locking and feedback mechanism 200, and a self-energizing sealing mechanism 300;

[0048] refer to Figures 2-5The valve body structure and pre-sealing mechanism 100 includes a valve body 110, a valve stem body 120 located inside the valve body 110 and having a sealing head 120a at the top, a handwheel body 130 installed on the top of the valve stem body 120, and a bellows body 140 located inside the valve body 110. When the handwheel body 130 is turned, the valve stem body 120 is driven to move downward quickly and automatically performs preliminary pre-sealing on the bellows body 140. This is used to quickly perform pre-sealing when the valve needs to be closed, as the handwheel body 130 drives the valve stem body 120 to move downward, thereby saving the time of closing the valve and gradually enhancing the sealing effect.

[0049] refer to Figures 2-4 The sealing locking and feedback mechanism 200 is installed inside the valve body 110. When the valve body 110 descends to a certain position, the sealing locking and feedback mechanism 200 is automatically activated to lock the pre-seal of the bellows body 140 and provide immediate sound feedback on the tightness of the valve body. This is used to lock the pre-seal during valve closing to prevent pre-seal failure, and to provide immediate sound feedback on the tightness of the valve, thereby assisting the user in judging the tightness of the valve and achieving precision and visualization.

[0050] refer to Figures 2-4 The self-energizing sealing mechanism 300 is installed inside the valve body 110. When the sealing locking and feedback mechanism 200 is working, it automatically drives the self-energizing sealing mechanism 300 to work, and performs a hard seal around the bellows body 140. After the valve is closed, the self-energizing sealing mechanism 300 automatically tightens the outer wall of the bellows body 140, thereby making the bellows body 140 more airtight and better able to cope with high-pressure conditions.

[0051] In this embodiment, reference Figures 2-4 The sealing head 120a is connected to the bottom of the valve stem body 120 via a flexible snap-fit ​​connector, which facilitates the replacement of the sealing head 120a. When the sealing head 120a is damaged, it can be quickly disassembled and reassembled via the flexible snap-fit ​​connector, thereby achieving rapid replacement of the sealing head 120a. This improves replacement efficiency and avoids the situation where the entire valve stem body 120 needs to be replaced when the sealing head 120a is damaged, thus saving on usage costs.

[0052] In this embodiment, the specific workflow is as follows: When the valve needs to be closed, the handwheel body 130 is first rotated to drive the valve stem body 120 to rotate. When the valve stem body 120 rotates, it first moves downward quickly to reduce the number of rotations, thereby saving the time of closing the valve. During this process, the bellows body 140 is pre-sealed. When the bellows body 140 descends to a certain position, the sealing locking and feedback mechanism 200 is automatically activated to lock the pre-sealing of the bellows body 140 in the first stage, thereby preventing leakage. At the same time, the degree of valve tightening is fed back through sound, which makes it easy for the user to judge the degree of valve tightening in real time, thereby achieving precise valve closing. Meanwhile, when the sealing locking and feedback mechanism 200 is working, it drives the self-energizing mechanism to tighten the bellows body 140 around its perimeter, thereby achieving a hard seal on the bellows body 140, thus achieving a higher degree of sealing and making it easier to cope with high-pressure conditions.

[0053] Example 3

[0054] Based on Example 2, and referring to Figures 4-8 The top of the valve body 110 is bolted with a valve body cover plate 110a, which has an internal lead nut. The valve body cover plate 110a is used to seal the top of the valve body 110. The internal lead nut is used to cooperate with the large lead thread 120b, so that when the valve stem body 120 rotates, the rotational force is converted into a force that drives the valve stem body 120 to move linearly. At the same time, the large lead thread 120b enables the valve stem body 120 to move downward quickly when it rotates, thereby reducing the number of rotations of the valve stem body 120 and reducing the time required to close the valve.

[0055] refer to Figure 4 The upper end of the outer side wall of the valve stem body 120 has a large lead thread 120b, which is used to drive the body to move quickly when the valve stem body 120 rotates. The side wall of the valve stem body 120 is provided with a limiting shoulder 120c, which is used to squeeze the bellows cover plate 140a when the valve stem body 120 descends, thereby compressing the bellows body 140 and pre-pressing the bellows body 140 to achieve a pre-sealing effect.

[0056] refer to Figures 4-8 The top of the corrugated pipe body 140 is welded with a corrugated pipe cover plate 140a, which is used to receive the limiting shoulder 120c and facilitate the installation of the corrugated pipe body 140.

[0057] In this embodiment, the specific workflow is as follows: (Refer to...) Figure 6When the handwheel body 130 is turned, the valve stem body 120 is rotated. Through the cooperation of the large lead thread 120b and the lead nut, the valve stem body 120 moves downward quickly. During this process, the limiting shoulder 120c moves synchronously with the valve stem body 120. When the top of the bellows cover plate 140a is squeezed, the bellows body 140 is compressed, thus achieving the pre-pressure of the bellows body 140, thereby achieving the effect of pre-sealing the inside of the valve body 110.

[0058] Example 4

[0059] Based on Example 3, and referring to Figures 4-8 The sealing, locking, and feedback mechanism 200 includes a ratchet 210 fixedly sleeved on the valve stem body 120, a plurality of elastic pawls 220 evenly distributed on the outer wall of the ratchet 210, and a feedback component 230 installed inside the valve body 110 and corresponding to the elastic pawls 220. The ratchet 210 is used to drive the plurality of elastic pawls 220 to rotate when the valve stem body 120 rotates. The elastic pawls 220 are used to intermittently collide with the feedback component 230 when rotating, thereby intermittently emitting a collision sound, thus providing real-time sound feedback to the user. At the same time, through the cooperation of the ratchet 210 and the elastic pawls 220, one-way locking is achieved, avoiding the pre-seal failure caused by the loosening of the pre-seal of the bellows body 140. The feedback component 230 is used to cooperate with the elastic pawls 220 during the rotation of the ratchet 210 with the valve stem body 120, and to provide real-time sound feedback on the tightness of the valve.

[0060] In this embodiment, the inner wall of the valve body 110 is provided with a coaxial arc-shaped moving groove 110b, which is used to facilitate the movable installation of the arc-shaped sawtooth block 230a.

[0061] refer to Figure 4The feedback component 230 includes an arc-shaped sawtooth block 230a slidably mounted within the arc-shaped moving groove 110b and an elastic element 230b located on one side of the arc-shaped sawtooth block 230a. The arc-shaped sawtooth block 230a is used to emit a collision sound when the elastic pawl 220 contacts it and to unidirectionally limit and lock the elastic pawl 220 through the sawtooth on its sidewall. The elastic element 230b is used to, after the elastic pawl 220 contacts the arc-shaped sawtooth block 230a, move within the arc-shaped moving groove 110b and then... As the elastic element 230b is compressed to a certain displacement, its own reaction force forces the arc-shaped serrated block 230a to stop moving. As the valve stem body 120 and ratchet 210 continue to rotate, the elastic pawl 220 is squeezed and flipped inward under the limiting action of the arc-shaped serrated block 230a, thereby separating the elastic pawl 220 from the arc-shaped serrated block 230a. The elastic element 230b forces the arc-shaped serrated block 230a to quickly reset under its own reaction force, thus accepting the collision with the next elastic pawl 220.

[0062] In this embodiment, the specific workflow is as follows: (Refer to...) Figure 7 As the valve stem body 120 continues to descend and rotate, the ratchet 210 and the elastic pawl 220 descend and rotate synchronously with the valve stem body 120. When the elastic pawl 220 descends to a certain position, it contacts and collides with the arc-shaped serrated block 230a, producing a collision sound. As the valve stem body 120 and the ratchet 210 continue to rotate, the elastic pawl 220 drives the arc-shaped serrated block 230a to move within the arc-shaped moving groove 110b. At this time, the elastic element 230b is gradually compressed until it can no longer be compressed. The reaction force of the elastic element 230b forces the arc-shaped serrated block 230a to stop moving within the arc-shaped moving groove 110b. The valve continues to move within the arc-shaped moving groove 110b. The elastic pawl 220, driven by the rotation of the ratchet 210 and limited by the arc-shaped sawtooth block 230a, rotates inward, thus separating from the arc-shaped sawtooth block 230a. At this point, the elastic element 230b drives the arc-shaped sawtooth block 230a to quickly reset within the arc-shaped moving groove 110b, facilitating the collision of the next elastic pawl 220 with it. This intermittently produces a collision sound, allowing the user to clearly know from the "click" sound and feel that the valve is being gradually locked, and to quantify the closing position (e.g., "closed after three clicks"), achieving precise and visual operation.

[0063] Through the mechanical linkage between the sealing locking and feedback mechanism 200 and the valve body structure and pre-sealing mechanism 100, when the operator rotates the handwheel, they will experience two distinctly different stages. In the first stage, the resistance is very small (only compressing the bellows body 140), and the valve stem body 120 descends rapidly. At the beginning of the second stage (i.e., the instant the elastic pawl 220 contacts the arc-shaped serrated block 230a), the operator will clearly feel a sudden increase in resistance (because it is necessary to overcome the spring force of the ratchet mechanism 210 and the resistance of the elastic element 230b). This gives the operator a clear "tactile signal": the valve has completed rapid approach and has now entered the fine sealing stage. During the tight phase, this effect only occurs when the linkage occurs, making the operation intuitive and less prone to errors. In addition, the moment the sealing locking and feedback mechanism 200 is triggered, it mechanically confirms that the pre-seal has successfully completed its "initial sealing" stroke. More importantly, once the ratchet 210 and elastic pawl 220 mechanism start working, their self-locking characteristics will reverse and "lock" the achieved initial sealing state, preventing the bellows body 140 from rebounding and the initial seal from failing due to pipeline pressure fluctuations or vibrations. Without this linkage, the initial seal is only a temporary and unstable state; with the linkage, it becomes a locked and reliable reference state.

[0064] Example 5

[0065] Based on Example 4, and referring to Figure 5 The inner wall of the valve body 110 is provided with an installation groove 110 for easy installation of the annular airbag 310.

[0066] refer to Figures 4-8 The self-increasing sealing mechanism 300 includes an annular airbag 310 installed in the mounting groove 110 and a venting pipe with one end connected to the annular airbag 310 and the other end connected to the arc-shaped moving groove 110b. The annular airbag 310 is used to expand after the internal air pressure increases, thereby gradually squeezing and filling the outer wall of the bellows body 140 to enhance the sealing effect. The venting pipe is used to inflate the annular airbag 310 through the venting pipe when the sealing locking and feedback mechanism 200 is working, so that the annular airbag 310 starts to expand synchronously.

[0067] In this embodiment, the side wall of the arc-shaped moving groove 110b is provided with a vent hole 110b-1 that communicates with the ventilation pipe. After the vent hole 110b-1 is connected to the ventilation pipe, when the air guide column 230a1 is squeezed into the vent hole 110b-1, the air in the vent hole 110b-1 can enter the ventilation pipe and then enter the annular airbag 310.

[0068] The side wall of the arc-shaped sawtooth block 230a is provided with an air guide column 230a1 corresponding to the vent hole 110b-1. When the arc-shaped sawtooth block 230a is driven by the elastic pawl 220 to move once in the arc-shaped moving groove 110b, the air guide column 230a1 will squeeze into the vent hole 110b-1 once, thereby squeezing the air in the vent hole 110b-1 into the ventilation pipe. After the elastic element 230b drives the arc-shaped sawtooth block 230a to reset and contact the next elastic pawl 220, the arc-shaped sawtooth block 230a will drive the air guide column 230a1 to squeeze the vent hole 110b-1 again, thereby realizing reciprocating squeezing and air pumping.

[0069] The ventilation pipeline is equipped with a one-way valve to prevent air from leaking from the ventilation hole 110b-1 when the air guide column 230a1 is drawn out from the ventilation hole 110b-1.

[0070] In this embodiment, the outer wall of the valve body 110 is provided with a vent 110d that communicates with the annular airbag 310. When the valve needs to be opened, the air in the annular airbag 310 is released through the vent 110d, thereby loosening the bellows body 140 and facilitating the subsequent opening of the valve.

[0071] In this embodiment, a bellows reinforcing ring (not shown in the figure) is provided on the outer wall of the bellows body 140. The bellows reinforcing ring corresponds to the annular air bladder 310 and is used to radially compress the bellows reinforcing ring after the annular air bladder 310 expands. The bellows reinforcing ring evenly transmits the radial compressive force to the outer wall of the bellows body 140. The circumferentially uniform radial clamping force avoids the unilateral wear caused by the eccentric force of the valve stem body 120 in traditional valves, and significantly extends its service life.

[0072] In this embodiment, the specific workflow is as follows: After the elastic pawl 220 contacts the arc-shaped serrated block 230a, as the valve stem body 120 and the ratchet 210 rotate, the arc-shaped serrated block 230a moves within the arc-shaped moving groove 110b until the elastic element 230b is compressed to a certain amount, at which point the elastic pawl 220 can no longer drive the arc-shaped serrated block 230a to continue moving. During this process, the air guide column 230a1 moves along with the arc-shaped serrated block 230a towards the vent hole 110b-1. The internal compression once draws air from the vent 110b-1 into the annular airbag 310 through the vent pipe, causing the annular airbag 310 to inflate. As the arc-shaped serrated block 230a collides with multiple elastic pawls 220, it performs multiple movement and reset operations, thereby driving the air guide column 230a1 to repeatedly compress the interior of the vent 110b-1, thus gradually inflating the annular airbag 310. (Reference) Figure 8After the annular airbag 310 expands, it transmits the radial extrusion force to the bellows reinforcing ring. The bellows reinforcing ring then transmits the radial extrusion force evenly to the outer wall of the bellows, thereby achieving the ultimate hard seal of the bellows body 140. Thus, through the dual protection of the initial pre-seal and the ultimate hard seal, combined with the self-strengthening effect, theoretically zero leakage can be achieved.

[0073] Meanwhile, through the mechanical linkage between the self-energizing sealing mechanism 300 and the sealing locking and feedback mechanism 200, the annular airbag 310 has a small expansion force when the self-energizing sealing mechanism 300 is initially driven to work. As the stroke deepens, the force is amplified, that is, the radial compression increases. The "stepping" motion mode of the sealing locking and feedback mechanism 200 is perfectly matched with this nonlinear force amplification characteristic. The first few "clicks" may only produce a moderate sealing force, while the last few "clicks" will produce a huge, exponentially increasing sealing force. This linkage mode essentially provides the valve with a built-in "overload protection". The operator operates by a limited and countable number of step turns, avoiding the risk of the bellows body 140 or valve body 110 being crushed due to unlimited tightening like traditional valves. "Stop when tightened to the specified number of clicks" becomes possible, realizing precise control of the sealing force.

[0074] Furthermore, the uniform radial force ensures that the bellows reinforcing ring and the bellows body 140 are subjected to uniform stress, avoiding early fatigue damage caused by single-point stress concentration. More importantly, if the valve's sealing surface is worn due to long-term use or foreign objects, the operator will find that the "sound count" required to achieve a complete seal increases in subsequent operations. Conversely, if the required "sound count" decreases abnormally, it may indicate abnormal deformation of internal components. Therefore, through the mechanical linkage between the self-energizing sealing mechanism 300 and the sealing locking and feedback mechanism 200, the "sound count" of the ratchet 210 is transformed into a "mechanical instrument" that indirectly monitors the health status of the bellows body 140 and the valve body 110.

[0075] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A manual bellows valve characterized by, It comprises: a valve body (1), a valve head (2) mounted on the valve body (1), a split ring (3) arranged in the valve head (2), a valve head nut (4) connected with the valve head (2), a valve stem (5) located in the valve body (2), a bellows (7) welded inside the valve body (1), a lower bellow cover (6) located at the bottom end of the bellows (7) and an upper bellow cover (8) located at the top end of the bellows (7), a bracket (9), a pin key (10), a packing seal structure fixed by full thread bolts (11), the packing seal structure comprising a packing (14) and a packing pressing plate (15) and being compressed by a nut (12), a bolt gasket (13), a flat needle thrust bearing (18) installed by full thread bolts (16) and nuts (17), a valve stem nut (19), a bearing pressing cover (20), a hand wheel (21), and a hand wheel nut (22) for locking the hand wheel (21) at the top end of the valve stem (5), wherein a primary seal is formed between the valve stem (5) and the bellows (7), and the packing seal structure is arranged around the valve stem (5) to form a standby secondary seal, which together constitute a double sealing system.

2. A manual bellows valve according to claim 1, wherein It also comprises a valve body structure and pre-sealing mechanism (100), a sealing locking and feedback mechanism (200), and a self-increasing force sealing mechanism (300); The valve body structure and pre-sealing mechanism (100) comprises a valve body (110), a valve stem body (120) located in the valve body (110) and having a sealing head (120a) at the top, a hand wheel body (130) mounted at the top of the valve stem body (120), and a bellows body (140) located inside the valve body (110), wherein, When the hand wheel body (130) starts to rotate, the valve stem body (120) is driven to move downward quickly and automatically pre-seals the bellows body (140) initially; The sealing locking and feedback mechanism (200) is installed in the valve body (110), wherein when the valve body (110) is lowered to a certain position, the sealing locking and feedback mechanism (200) is automatically driven to work, locking the pre-sealing of the bellows body (140) and immediately feeding back the locking degree of the valve body through sound; The self-increasing force sealing mechanism (300) is installed in the valve body (110), wherein when the sealing locking and feedback mechanism (200) works, the self-increasing force sealing mechanism (300) is automatically driven to work, tightly sealing the periphery of the bellows body (140).

3. A manual bellows valve according to claim 2, wherein The sealing head (120a) is connected with the bottom of the valve stem body (120) through a flexible clamping joint.

4. A manual bellows valve according to claim 3, wherein The top of the valve body (110) is provided with a valve body cover plate (110a) having a lead nut inside through bolts; The outer sidewall of the valve stem body (120) has a large lead thread (120b) at the top, and the sidewall of the valve stem body (120) is provided with a limiting shoulder (120c); A bellow cover plate (140a) is welded on the top of the bellow body (140).

5. A manual bellows valve according to claim 4, wherein The sealing locking and feedback mechanism (200) comprises a ratchet wheel (210) fixedly sleeved on the valve rod body (120), a plurality of elastic pawls (220) uniformly distributed on the outer sidewall of the ratchet wheel (210), and a feedback assembly (230) installed in the valve body (110) and corresponding to the elastic pawls (220).

6. A manual bellows valve according to claim 5, wherein An arc-shaped moving groove (110b) coaxial with the center is arranged on the inner wall of the valve body (110). The feedback assembly (230) comprises an arc-shaped sawtooth block (230a) slidably installed in the arc-shaped moving groove (110b) and an elastic member (230b) located on one side of the arc-shaped sawtooth block (230a).

7. A manual bellows valve according to claim 6, wherein An installation groove (110) is arranged on the inner wall of the valve body (110). The self-increasing force sealing mechanism (300) comprises an annular air bag (310) installed in the installation groove (110) and an air passage with one end communicated with the annular air bag (310) and the other end communicated with the arc-shaped moving groove (110b).

8. A manual bellows valve according to claim 7, wherein An air hole (110b-1) communicated with the air passage is arranged on the sidewall of the arc-shaped moving groove (110b). An air guide column (230a1) corresponding to the air hole (110b-1) is arranged on the sidewall of the arc-shaped sawtooth block (230a). A one-way valve is arranged in the air passage.

9. A manual bellows valve according to claim 8, wherein A gas discharge port (110d) communicated with the annular air bag (310) is arranged on the outer sidewall of the valve body (110).

10. A manual bellows valve according to claim 9, wherein, A bellow reinforcing ring corresponding to the annular air bag (310) is arranged on the outer wall of the bellow body (140).

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