A valve body having a double seal
By employing a dual-seal design that combines mechanical and pneumatic seals, the sealing problem of existing valves under complex operating conditions is solved, achieving a highly efficient leak-proof, self-cleaning, and long-life sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU BOTES VALVE MANUFACTURING CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-07
AI Technical Summary
The existing valves' single mechanical seal structure is difficult to adapt to complex working conditions. In particular, micro-leakage is prone to occur when the medium pressure fluctuates. Residual medium is easy to accumulate in the valve seat area, leading to corrosion and scaling on the sealing surface. In addition, there is a lack of automatic wear compensation function, and the sealing performance decreases with the use time.
It adopts a dual-seal design, combining mechanical seal and pneumatic seal. The mechanical seal forms the first seal by tightly fitting the sealing head with the inclined surface of the sealing groove. The pneumatic seal provides a second flexible seal by expanding the sealing airbag. It also achieves a self-cleaning function through the linkage between the drainage groove and the sealing airbag. The return spring and folding waterproof cover compensate for the wear of the sealing surface.
It significantly improves the sealing performance and reliability of the valve body, prevents media leakage, is suitable for high-pressure or corrosive fluid conditions, extends valve service life and reduces maintenance requirements, and achieves self-cleaning and wear compensation of the sealing surface.
Smart Images
Figure CN224469676U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve body technology, specifically a valve body with double sealing. Background Technology
[0002] As a key component in fluid control systems, the sealing performance of valves directly affects the safety and reliability of the system. In industries such as petrochemicals and power generation, traditional valves generally adopt a single mechanical seal structure, achieving sealing through hard contact between the valve disc and the valve seat. While this structure can meet the requirements under normal operating conditions, it often leads to problems such as seal failure and media leakage under harsh conditions such as high pressure, corrosive media, or drastic temperature changes.
[0003] Valves in the current technology are generally single mechanical seal structures, which are difficult to adapt to the sealing requirements under complex working conditions. In particular, micro-leakage is prone to occur when the medium pressure fluctuates. Secondly, residual medium is easy to accumulate in the valve seat area, leading to corrosion and scaling on the sealing surface, which affects the sealing effect. Furthermore, traditional sealing structures lack automatic wear compensation functions, and the sealing performance will gradually decline with the increase of service time. Utility Model Content
[0004] The technical problems to be solved;
[0005] The purpose of this invention is to overcome the shortcomings of existing valves, which are generally single mechanical seal structures, making it difficult to adapt to the sealing requirements under complex working conditions. In particular, they are prone to micro-leakage when the medium pressure fluctuates. Secondly, residual medium is easy to accumulate in the valve seat area, leading to corrosion and scaling on the sealing surface, which affects the sealing effect. Furthermore, traditional sealing structures lack automatic wear compensation functions, and the sealing performance will gradually decline with the increase of use time.
[0006] Technical solution;
[0007] To achieve the above objectives, this utility model provides the following technical solution: a valve body with double sealing, comprising a valve body and connecting flanges, wherein connecting flanges are fixedly connected to both ends of the valve body, and a sealing cover is fixedly connected to the top of the valve body by bolts; a sealing groove is provided at the obstruction of the valve body, and the cross-section of the sealing groove is an isosceles trapezoid; a sealing mechanism is movably connected inside the valve body, and the sealing mechanism extends through the sealing cover to its top; an auxiliary mechanism is movably connected inside the sealing mechanism.
[0008] Furthermore, the sealing mechanism includes a handwheel, a valve stem, a drive seat, a support rod, and a sealing head. The handwheel is fixedly connected to the top of the valve stem, and the other end of the valve stem is movably connected to the top axis of the drive seat via a bearing. One end of the support rod is fixedly connected to the side of the drive seat away from the valve stem, and the sealing head is fixedly connected to the other end of the support rod.
[0009] Furthermore, the valve stem has threads on its outer side, and the valve stem is vertically connected to the sealing cover via the threads. The handwheel is located on the outer side of the sealing cover. The drive seat, support rod, and sealing head are all located inside the valve body. The sealing head has a connecting groove on its outer side, and an annular inclined surface is formed at the end of the sealing head away from the support rod. Several drainage grooves are formed on the annular inclined surface of the sealing head, and the drainage grooves are evenly distributed in a circular array on the inclined surface of the sealing head. The top of the drainage grooves is connected to the connecting groove.
[0010] Furthermore, the sealing mechanism also includes a folded waterproof cover, a return spring, and a fixing ring. The folded waterproof cover and the return spring are both sleeved on the outside of the support rod. One end of the folded waterproof cover and the return spring are fixedly connected to the bottom of the fixing ring, and the other end of the folded waterproof cover and one end of the return spring are both fixedly connected to the end of the sealing head near the support rod.
[0011] Furthermore, the cross-sections of the reset spring and the folding waterproof cover are both inverted trapezoidal, and the reset spring is located on the inner side of the folding waterproof cover. The outer side of the fixing ring is embedded and fixedly connected to the inside of the valve body. An air chamber is opened inside the support rod. A connecting hole is opened at the center of the top of the valve rod, and the connecting hole penetrates downward through the drive seat and communicates with the air chamber.
[0012] Furthermore, the auxiliary mechanism includes a rotating handle, a drive rod, a rubber pusher, a connecting tube, and a sealing airbag. The rotating handle is fixedly connected to one end of the drive rod, and the rubber pusher is movably connected to the other end of the drive rod via a bearing. The sealing airbag is annular, and several connecting tubes are arranged in a ring and fixedly connected to the inner side of the sealing airbag.
[0013] Furthermore, the sealing airbag is fixedly connected to the inside of the connecting groove, and the outer side of the sealing airbag is tightly attached to the inside of the sealing groove. The end of the connecting tube away from the sealing airbag extends through the sealing head into the inside of the air chamber. The rubber push head is slidably connected to the inside of the air chamber. The drive rod has a thread on its outer side and vertically passes through the connecting hole and the air chamber. The drive rod and the connecting hole are movably connected by the thread, and the rotating handle is located at the top of the valve stem.
[0014] Compared with existing technologies, this valve body with dual sealing has the following advantages:
[0015] I. This utility model significantly improves the sealing performance of the valve body through the dual design of mechanical seal and pneumatic seal. The sealing head and the inclined surface of the sealing groove are tightly fitted to form the first mechanical seal, while the inflated sealing bladder constitutes the second flexible seal. The two seals work together to effectively prevent media leakage, and are especially suitable for high pressure or corrosive fluid conditions, greatly enhancing the reliability and safety of the valve body.
[0016] Second, this utility model achieves the self-cleaning function of the sealing surface through the linkage design of the drainage groove and the sealing airbag. When the sealing airbag expands, it squeezes the residual liquid in the sealing groove and automatically discharges it through the annular inclined drainage groove, avoiding the accumulation of liquid and corrosion of the sealing parts. At the same time, the return spring and the folded waterproof cover expand and contract synchronously during the sealing process, which can not only compensate for the wear of the sealing surface, but also protect the internal mechanism, significantly extending the service life of the valve and reducing maintenance requirements.
[0017] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description
[0018] The present invention will be further described below with reference to the accompanying drawings:
[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0020] Figure 2 This is a cross-sectional structural diagram of the sealing mechanism of this utility model;
[0021] Figure 3 This is a cross-sectional structural diagram of the auxiliary mechanism of this utility model;
[0022] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;
[0023] Figure 5 This is a schematic diagram of the cross-sectional connection structure of the sealing head of this utility model.
[0024] In the diagram: 1 Valve body, 2 Connecting flange, 3 Sealing cover, 4 Sealing groove, 5 Sealing mechanism, 501 Handwheel, 502 Valve stem, 503 Drive seat, 504 Support rod, 505 Sealing head, 506 Folding waterproof cover, 507 Return spring, 508 Fixing ring, 6 Auxiliary mechanism, 601 Rotating handle, 602 Drive rod, 603 Rubber push head, 604 Connecting pipe, 605 Sealing airbag, 7 Drain groove, 8 Connecting groove, 9 Connecting hole, 10 Air chamber. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.
[0026] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.
[0027] like Figures 1-5 As shown, this utility model provides a technical solution: a valve body with double sealing, including a valve body 1 and a connecting flange 2. The two ends of the valve body 1 are respectively fixedly connected to the connecting flange 2, and the top of the valve body 1 is fixedly connected to the sealing cover 3 by bolts. A sealing groove 4 is provided at the obstruction of the valve body 1, and the cross section of the sealing groove 4 is an isosceles trapezoid. A sealing mechanism 5 is movably connected inside the valve body 1, and the sealing mechanism 5 extends through the sealing cover 3 to its top. An auxiliary mechanism 6 is movably connected inside the sealing mechanism 5.
[0028] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the sealing mechanism 5 includes a handwheel 501, a valve stem 502, a drive seat 503, a support rod 504, and a sealing head 505. The handwheel 501 is fixedly connected to the top of the valve stem 502, and the other end of the valve stem 502 is movably connected to the top axis of the drive seat 503 via a bearing. One end of the support rod 504 is fixedly connected to the side of the drive seat 503 away from the valve stem 502. The sealing head 505 is fixedly connected to the other end of the support rod 504. The valve stem 502 has threads on its outer side, and the valve stem 502 is vertical. The valve body 1 is directly connected to the sealing cover 3 by a thread, and the handwheel 501 is located on the outside of the sealing cover 3. The drive seat 503, support rod 504 and sealing head 505 are all located inside the valve body 1. A connecting groove 8 is provided on the outside of the sealing head 505, and an annular inclined surface is provided at the end of the sealing head 505 away from the support rod 504. Several drainage grooves 7 are provided on the annular inclined surface of the sealing head 505, and the drainage grooves 7 are evenly distributed in an annular array on the inclined surface of the sealing head 505. The top of the drainage grooves 7 are connected to the connecting groove 8.
[0029] The valve stem 502, driven by the handwheel 501 and connected by threads, works in conjunction with the rigid support rod 504 to form a precise inclined hard seal between the sealing head 505 and the trapezoidal sealing groove 4. This ensures rapid response and high-pressure bearing capacity of the first seal. Secondly, the annular inclined sealing head 505, in conjunction with the array-type drainage groove 7 and the connecting flow channel, forces the discharge of residual liquid during the sealing process, effectively solving the industry problems of corrosive media accumulation and low-temperature freezing. While ensuring overall assembly accuracy, it also achieves automatic compensation for sealing surface wear, enabling the valve to achieve excellent sealing performance while also being easy to maintain and having a long service life. The overall technical solution has significantly improved sealing reliability, corrosion resistance, and ease of maintenance compared to traditional valves.
[0030] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the sealing mechanism 5 also includes a folded waterproof cover 506, a return spring 507, and a fixing ring 508. The folded waterproof cover 506 and the return spring 507 are both sleeved on the outside of the support rod 504. One end of the folded waterproof cover 506 and the return spring 507 are fixedly connected to the bottom of the fixing ring 508, and the other end of the folded waterproof cover 506 and one end of the return spring 507 are both fixedly connected to the end of the sealing head 505 near the support rod 504. The cross-sections of the return spring 507 and the folded waterproof cover 506 are both inverted trapezoidal, and the return spring 507 is located inside the folded waterproof cover 506. The outside of the fixing ring 508 is embedded and fixedly connected to the inside of the valve body 1. An air chamber 10 is opened inside the support rod 504. A connecting hole 9 is opened at the center of the top of the valve stem 502, and the connecting hole 9 penetrates downward through the drive seat 503 and communicates with the air chamber 10.
[0031] The nested structure of the inverted trapezoidal folded waterproof cover 506 and the return spring 507 forms a double dynamic sealing barrier. During the movement of the sealing head 505, it can prevent external media from entering the internal mechanism and maintain a constant sealing pressure through the elastic return of the return spring 507. Secondly, the air chamber 10 inside the support rod 504 and the connecting hole 9 of the valve stem 502 form a continuous gas channel, providing an efficient transmission path for subsequent pneumatic sealing and greatly improving space utilization. The embedded installation of the fixing ring 508 ensures the stable positioning of the entire sealing mechanism 5, so that the folded waterproof cover 506 and the return spring 507 can accurately follow the movement of the sealing head 505, thereby improving the reliability and service life of the sealing system and reducing maintenance difficulty.
[0032] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the auxiliary mechanism 6 includes a rotary handle 601, a drive rod 602, a rubber pusher 603, a connecting pipe 604, and a sealing airbag 605. The rotary handle 601 is fixedly connected to one end of the drive rod 602, and the rubber pusher 603 is movably connected to the other end of the drive rod 602 via a bearing. The sealing airbag 605 is annular. Several connecting pipes 604 are arranged in a ring and are evenly fixedly connected to the inner side of the sealing airbag 605. The interior of the sealing airbag 605 is fixedly connected to the interior of the connecting groove 8, and the exterior of the sealing airbag 605 is tightly attached to the interior of the sealing groove 4. One end of the connecting pipe 604 away from the sealing airbag 605 extends through the sealing head 505 into the interior of the air chamber 10. The rubber pusher 603 is slidably connected to the interior of the air chamber 10. The drive rod 602 has threads on its outer side and vertically passes through the connecting hole 9 and the air chamber 10. The drive rod 602 and the connecting hole 9 are movably connected via threads, and the rotary handle 601 is located at the top of the valve stem 502.
[0033] The air pressure inside the air chamber 10 can be precisely controlled by simply rotating the handle 601, causing the sealing airbag 605 to generate uniform radial expansion pressure and form a flexible adaptive seal, perfectly compensating for the rigidity defects of the mechanical seal. Secondly, the multiple connecting pipes 604 arranged in a ring array ensure that compressed air can be quickly and evenly delivered to the entire ring sealing airbag 605, so that all parts of the sealing airbag 605 expand synchronously and achieve a seamless fit with the trapezoidal sealing groove 4, significantly improving the reliability and sealing efficiency of the second seal. The pneumatic control channel is completely built into the valve stem 502 and the support rod 504, which not only maintains the simplicity and beauty of the external structure, but also avoids the cumbersome external air source pipeline, enabling the valve to achieve dual sealing function even in a confined space, greatly expanding the product's applicability and ease of use.
[0034] Working principle: When valve body 1 needs to be closed, the valve stem 502 is rotated manually using handwheel 501. The bottom of valve stem 502 then pushes the drive seat 503 downwards inside valve body 1. The drive seat 503, using support rod 504, pushes the sealing head 505 towards the sealing area. During this process, the sealing head 505 simultaneously pulls the return spring 507 and the folded waterproof cover 506 downwards. When handwheel 501 stops rotating, the connecting groove 8 and sealing groove 4 are at the same cross-section. Then, gripping the rotating handle 601 drives the drive rod 602. The bottom of drive rod 602 then pushes the rubber pusher 603 downwards, sliding it inside air chamber 10, thus forcing the air inside air chamber 10 downwards through connecting pipe 60. 4. The sealing airbag 605 is inflated and its outer side is pressed against the inside of the sealing groove 4. The residual liquid in the sealing groove 4 is squeezed and falls below through the drain groove 7, completing the sealing operation. The flowing liquid is blocked at the top of the sealing head 505. When the sealing state needs to be released, the handle 601 is rotated in the opposite direction so that its drive rod 602 drives the rubber push head 603 to slide upward inside the air chamber 10. At this time, the connecting pipe 604 draws the air out of the sealing airbag 605 into the air chamber. Then the sealing airbag 605 retracts back into the connecting groove 8. Next, the handwheel 501 is rotated in the opposite direction so that the valve stem 502 drives the drive seat 503 to pull the sealing head 505 back to its original position. At this time, the liquid flows normally inside the valve body 1.
[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A valve body with double sealing, comprising a valve body and a connecting flange, characterized in that: The valve body has connecting flanges fixedly connected to both ends of the valve body, and a sealing cover is fixedly connected to the top of the valve body by bolts. A sealing groove is provided at the obstruction of the valve body, and the cross-section of the sealing groove is an isosceles trapezoid. A sealing mechanism is movably connected inside the valve body, and the sealing mechanism extends through the sealing cover to its top. An auxiliary mechanism is movably connected inside the sealing mechanism.
2. The valve body with double sealing according to claim 1, characterized in that: The sealing mechanism includes a handwheel, a valve stem, a drive seat, a support rod, and a sealing head. The handwheel is fixedly connected to the top of the valve stem, and the other end of the valve stem is movably connected to the top axis of the drive seat via a bearing. One end of the support rod is fixedly connected to the side of the drive seat away from the valve stem, and the sealing head is fixedly connected to the other end of the support rod.
3. The valve body with double sealing according to claim 2, characterized in that: The valve stem has a thread on its outer side, and the valve stem is vertically connected to the sealing cover via the thread. The handwheel is located on the outer side of the sealing cover. The drive seat, support rod, and sealing head are all located inside the valve body. The sealing head has a connecting groove on its outer side, and an annular inclined surface is formed at the end of the sealing head away from the support rod. Several drainage grooves are formed on the annular inclined surface of the sealing head, and the drainage grooves are evenly distributed in a circular array on the inclined surface of the sealing head. The top of the drainage grooves is connected to the connecting groove.
4. The valve body with double sealing according to claim 2, characterized in that: The sealing mechanism also includes a folded waterproof cover, a return spring, and a fixing ring. The folded waterproof cover and the return spring are both sleeved on the outside of the support rod. One end of the folded waterproof cover and the return spring are fixedly connected to the bottom of the fixing ring, and the other end of the folded waterproof cover and one end of the return spring are both fixedly connected to the end of the sealing head near the support rod.
5. The valve body with double sealing according to claim 4, characterized in that: The cross-sections of the reset spring and the folding waterproof cover are both inverted trapezoidal, and the reset spring is located on the inner side of the folding waterproof cover. The outer side of the fixing ring is embedded and fixedly connected to the inside of the valve body. An air chamber is opened inside the support rod. A connecting hole is opened at the center of the top of the valve rod, and the connecting hole penetrates downward through the drive seat and communicates with the air chamber.
6. The valve body with double sealing according to claim 1, characterized in that: The auxiliary mechanism includes a rotating handle, a drive rod, a rubber pusher, a connecting tube, and a sealing airbag. The rotating handle is fixedly connected to one end of the drive rod, and the rubber pusher is movably connected to the other end of the drive rod via a bearing. The sealing airbag is annular, and several connecting tubes are arranged in a ring and evenly fixedly connected to the inner side of the sealing airbag.
7. The valve body with double sealing according to claim 6, characterized in that: The sealing airbag is fixedly connected to the inside of the connecting groove, and the outer side of the sealing airbag is in close contact with the inside of the sealing groove. The end of the connecting tube away from the sealing airbag extends through the sealing head into the inside of the air chamber. The rubber push head is slidably connected to the inside of the air chamber. The drive rod has a thread on its outer side and vertically passes through the connecting hole and the air chamber. The drive rod and the connecting hole are movably connected by the thread, and the rotating handle is located at the top of the valve stem.