High-performance fireproof butterfly valve

Abstract

The utility model discloses a high-performance fireproof butterfly valve which comprises a valve body, a butterfly plate and a sealing assembly arranged between the valve body and the butterfly plate, a groove is formed in the valve body, the side, facing the groove, of the butterfly plate is a sealing slope with the high inside and the low outside, and the sealing assembly comprises a soft sealing ring and a metal fireproof sealing ring which are sequentially arranged from inside to outside. The soft sealing ring and the metal fireproof sealing ring are fixed in the groove through the pressing plate ring, the end, facing the dish plate, of the metal fireproof sealing ring inclines outwards to form a first inclined face, the soft sealing ring is provided with a second inclined face matched with the first inclined face, and the inclination angle of the second inclined face is larger than that of the first inclined face. Through a double-layer sealing structure, inclined plane angle difference design and modular assembly, double breakthrough of fireproof performance and sealing reliability is achieved, meanwhile, manufacturing cost and maintenance difficulty are remarkably reduced, and innovation is embodied in a passive automatic sealing switching mechanism and structural simplified design.

Description

Technical Field

[0001] This utility model relates to a high-performance fireproof butterfly valve. Background Technology

[0002] Existing butterfly valves suffer from problems such as softening of sealing materials, complex structure, and high cost under high temperature or fire conditions. For example, ordinary soft sealing rings are prone to burnout at high temperatures, leading to media leakage; some fireproof valves rely on complex actuation mechanisms, resulting in high manufacturing costs. Therefore, there is an urgent need for a butterfly valve with a simple structure that combines fire resistance and sealing performance. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a high-performance fireproof butterfly valve that achieves automatic sealing switching during a fire through a design with different inclined angles, thus solving the problems of sealing failure and insufficient fireproof performance in the prior art.

[0004] The technical solution adopted in this utility model is:

[0005] A high-performance fireproof butterfly valve includes a valve body, a disc, and a sealing assembly disposed between the valve body and the disc. The valve body has a groove that matches the sealing assembly. The disc has a sealing slope that is higher on the inside and lower on the outside of the groove. The sealing assembly includes a soft sealing ring and a metal fireproof sealing ring arranged sequentially from the inside to the outside. The soft sealing ring and the metal fireproof sealing ring are fixed in the groove by an outer pressure plate ring. The metal fireproof sealing ring is inclined outward at the end facing the disc to form a first slope. The soft sealing ring has a second slope that matches the first slope on the side that connects with the metal fireproof sealing ring, and the inclination angle of the second slope is greater than that of the first slope.

[0006] Preferably, the groove includes a first groove and a second groove that are interconnected, the second groove being close to the disc plate, the first groove being used to clamp the metal fireproof sealing ring, and the second groove being used to clamp the metal fireproof sealing ring and the soft sealing ring.

[0007] Preferably, the angle difference between the first inclined plane and the second inclined plane is 5~15°.

[0008] Preferably, a fire-resistant pad is also provided in the first groove, and the fire-resistant pad is located between the metal fireproof sealing ring and the valve body.

[0009] Preferably, the soft sealing ring is made of PTFE material, and the metal fireproof sealing ring is made of stainless steel or nickel-based alloy.

[0010] This utility model achieves a dual breakthrough in fire resistance and sealing reliability through a double-layer sealing structure, a design with different angles on the inclined plane, and modular assembly. At the same time, it significantly reduces manufacturing costs and maintenance difficulty. Its innovation lies in the passive automatic sealing switching mechanism and the simplified structural design, and it has clear industrial applicability and market promotion value.

[0011] The innovative points of this utility model are:

[0012] 1. Double-layer sealing structure design:

[0013] This butterfly valve adopts a double-layer sealing structure that combines an inner soft sealing ring (PTFE material) with an outer metal fireproof sealing ring (stainless steel or nickel-based alloy);

[0014] Inner soft sealing ring: Under normal operating conditions, the low coefficient of friction and corrosion resistance of PTFE material enable efficient sealing in low-pressure environments.

[0015] Outer metal fireproof sealing ring: Under fire or high-temperature conditions, the high strength and high-temperature resistance of the metal material ensure that the sealing performance does not degrade and effectively prevents flame penetration;

[0016] Most existing butterfly valves use a single sealing structure (such as only soft seal or metal seal), while the double-layer structure can provide a reliable seal under both normal and extreme operating conditions through material complementarity, solving the problem of sealing failure of traditional butterfly valves at high temperatures;

[0017] 2. Differences in inclined plane angles and the mechanism of elastic deformation:

[0018] Different angle design: The contact surfaces of the soft sealing ring and the metal fireproof sealing ring are designed with different inclination angles (the inclination angle of the soft sealing ring is 5°~15° larger than that of the metal fireproof sealing ring), forming a pre-set elastic deformation.

[0019] Automatic sealing switching during fire:

[0020] Under normal operating conditions: Due to the small angle of the inclined surface, the metal fireproof sealing ring presses the soft sealing ring against the butterfly plate through elastic force to achieve a seal;

[0021] Fire conditions: After the soft sealing ring burns out, the metal fireproof sealing ring releases its elastic deformation, directly pressing the butterfly plate to maintain the sealing state;

[0022] Existing fire valves mostly rely on external drives (such as springs or thermal elements) to trigger sealing switching, while this solution achieves passive automatic sealing switching through the difference in the angle of the inclined plane. It has a simple structure and high reliability, avoiding the failure risk of complex drive mechanisms.

[0023] 3. Valve body groove and pressure plate ring fixing structure:

[0024] Layered groove design: The valve body groove is divided into a first groove (fixing the metal fireproof sealing ring) and a second groove (accommodating the soft sealing ring and the metal fireproof sealing ring), and the assembly is mechanically locked by the pressure plate ring;

[0025] Fire-resistant pad enhances fire resistance: A fire-resistant pad is added between the metal fire-resistant sealing ring and the valve body to further improve the heat insulation performance;

[0026] Existing fireproof butterfly valve sealing assemblies mostly employ multi-layer nesting or complex welding processes, while this solution simplifies the assembly process and reduces processing costs through modular groove design and fixation with pressure plate rings. At the same time, the introduction of fire-resistant pads enhances the overall fireproof performance of the valve.

[0027] The beneficial effects of this utility model are:

[0028] 1. Significantly improved fire resistance:

[0029] High temperature resistance of metal fireproof sealing rings: In an 800℃ fire simulation test, the metal fireproof sealing rings maintained structural integrity without deformation or ablation, effectively blocking the spread of flames along the pipes;

[0030] Fire-resistant pads provide additional insulation: Fire-resistant pads further reduce heat transfer to the valve body, preventing other valve components from failing due to high temperatures;

[0031] 2. Dual guarantee of sealing reliability

[0032] Under normal operating conditions: The low-friction characteristics of the PTFE soft seal ring ensure that the valve opens and closes smoothly with a leakage rate of ≤0.01%;

[0033] Fire conditions: The metal fireproof sealing ring elastically deforms and compresses the butterfly plate, and the leakage of the medium approaches zero, meeting the requirements of API607 fire protection certification;

[0034] 3. Structural simplification and cost optimization:

[0035] Modular components: The double-sealed components and groove design enable "ready to use immediately", reducing assembly time by 40%;

[0036] Reduced material costs: Compared to traditional fire valves (which require multi-layered graphite and metal seals), this solution reduces material costs by 30%;

[0037] 4. Ease of maintenance:

[0038] Replaceable sealing components: Worn or burned soft seals can be replaced individually without disassembling the entire valve, improving maintenance efficiency by 50%. Attached Figure Description

[0039] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0040] Figure 2 for Figure 1 Enlarged view of Part I;

[0041] Figure 3 for Figure 2 A schematic diagram of the structure when the soft sealing ring burns out. Detailed Implementation

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0049] like Figure 1-2 As shown, a high-performance fireproof butterfly valve includes a valve body 1, a disc 2, and a sealing assembly disposed between the valve body 1 and the disc 2. The valve body 1 has a groove 3 that matches the sealing assembly. The disc 2 has a sealing slope 4 with the inner side higher than the outer side facing the groove 3. The sealing assembly includes a soft sealing ring 5 and a metal fireproof sealing ring 6 arranged sequentially from the inside to the outside. The soft sealing ring 5 and the metal fireproof sealing ring 6 are fixed in the groove 3 by an outer pressure plate ring 7. The metal fireproof sealing ring 6 is inclined outward at the end facing the disc 2 to form a first slope 8. The soft sealing ring 5 has a second slope 9 that matches the first slope 8 on the side that connects with the metal fireproof sealing ring 6, and the inclination angle of the second slope 9 is greater than the inclination angle of the first slope 8.

[0050] The groove 3 includes a first groove 31 and a second groove 32 that are interconnected. The second groove 32 is close to the disc plate 2. The first groove 31 is used to clamp the metal fireproof sealing ring 6, and the second groove 32 is used to clamp the metal fireproof sealing ring 6 and the soft sealing ring 5.

[0051] The angle difference between the first inclined plane 8 and the second inclined plane 9 is 5~15°.

[0052] The first groove 31 is also provided with a fire-resistant pad 10, which is located between the metal fireproof sealing ring 6 and the valve body 1.

[0053] The soft sealing ring 5 is made of PTFE material, and the metal fireproof sealing ring 6 is made of stainless steel or nickel-based alloy.

[0054] The working principle of this utility model is as follows:

[0055] 1. Sealing mechanism under normal operating conditions:

[0056] Structural features and operation flow:

[0057] The double-layer sealing components work together:

[0058] Inner soft sealing ring (PTFE material): Under normal temperature or low pressure environment, the low coefficient of friction and elastic deformation capability of PTFE are used to tightly fit the sealing slope 4 of the butterfly plate 2 to achieve initial sealing.

[0059] Outer metal fireproof sealing ring (stainless steel or nickel-based alloy): Through the pre-set difference in the angle of the inclined plane (the angle of the second inclined plane 9 is 5°~15° larger than that of the first inclined plane 8), the metal fireproof sealing ring 6 undergoes elastic deformation during assembly, continuously applying pressure to the soft sealing ring 5, further enhancing the sealing effect.

[0060] The mechanical effects of differences in inclined plane angles:

[0061] Because the angle of the first inclined surface 8 of the metal fireproof sealing ring 6 is small, the radial force generated by its elastic deformation is transmitted through the inclined surface to the second inclined surface 9 of the soft sealing ring 5, pressing the soft sealing ring 5 against the sealing inclined surface 4 of the butterfly plate 2 to form a double pressure seal.

[0062] The fixing function of the pressure plate ring 7 is to ensure that the sealing assembly is stably fitted in the groove 3 of the valve body 1 through mechanical locking, so as to avoid sealing failure due to fluctuations in medium pressure.

[0063] 2. Sealing switching mechanism under fire conditions:

[0064] Structural response under high temperature conditions:

[0065] Failure process of soft sealing ring 5:

[0066] like Figure 3 As shown, when the ambient temperature exceeds the tolerance limit of PTFE (approximately 260°C), the soft sealing ring 5 gradually softens, burns, and loses its sealing ability.

[0067] Elastic deformation release of metal fireproof seal 6:

[0068] After the soft sealing ring 5 is burned, the metal fireproof sealing ring 6 loses the resistance of the soft sealing ring 5 due to the difference in the angle of the pre-set inclined surface (the angle of the second inclined surface 9 is larger) and directly acts on the sealing inclined surface 4 of the butterfly plate 2. At this time, the metal fireproof sealing ring 6 tightly fits the butterfly plate 2 through its own high strength and high elasticity to form a rigid sealing surface.

[0069] The auxiliary fireproofing function of fire-resistant pad 10:

[0070] The fire-resistant pad 10 is located between the metal fireproof sealing ring 6 and the valve body 1. It is made of ceramic fiber or graphite material, which effectively blocks the heat from being transferred to the valve body 1 and prevents the valve body 1 from deforming due to high temperature and causing the seal to fail.

[0071] 3. Advantages of modular assembly and maintenance:

[0072] Simplified assembly process:

[0073] Groove layered design:

[0074] First groove 31: Fixes the metal fireproof sealing ring 6 and locks it in place by the pressure plate ring 7;

[0075] The second groove 32 accommodates the composite structure of the soft sealing ring 5 and the metal fireproof sealing ring 6, ensuring precise alignment of the components;

[0076] Ready to use immediately: After the sealing components (soft sealing ring 5 + metal fireproof sealing ring 6 + fireproof pad 10) are pre-assembled, they are embedded into the groove 3 and quickly fixed by the pressure plate ring 7, reducing assembly time by 40%;

[0077] Ease of maintenance:

[0078] Replaceable design: If the soft seal ring 5 is worn or burned, only the pressure plate ring 7 needs to be removed to replace the soft seal ring 5 separately, without disassembling the entire valve, thus improving maintenance efficiency by 50%;

[0079] Independent replacement of fire-resistant pad 10: The fire-resistant pad 10 is designed to be separate from the metal fireproof sealing ring 6, allowing for individual maintenance or material upgrades.

[0080] 4. Correlation between key design parameters and performance:

[0081] Inclined angle difference (5°~15°): If the angle difference is too small (<5°), it will lead to insufficient elastic deformation and insufficient sealing pressure; if the angle difference is too large (>15°), it may cause plastic deformation of the metal sealing ring 6, affecting long-term reliability.

[0082] Fire resistant pad thickness and material: The thickness must match the thermal expansion coefficient of valve body 1, and the material must be resistant to high temperature (≥1000℃) and have low thermal conductivity (such as ceramic fiber).

[0083] This high-performance fireproof butterfly valve achieves the following core functions through the synergistic effect of a double-layer sealing structure, the elastic deformation mechanism caused by the difference in the angle of the inclined plane, and a modular assembly design:

[0084] Under normal operating conditions: PTFE soft seals provide a low-friction, highly elastic dynamic seal;

[0085] Fire conditions: The metal fireproof sealing ring automatically switches to a rigid seal, and the fire-resistant pad blocks heat transfer;

[0086] Economy and maintainability: Simplified structure reduces manufacturing costs, and modular design improves maintenance efficiency.

[0087] Its working principle fully combines material properties with innovative mechanical design, which significantly improves fire resistance and industrial applicability while ensuring sealing reliability.

[0088] Comparison test of this utility model with traditional butterfly valve:

[0089] Test conditions:

[0090] Normal temperature water pressure test: pressure 1.6MPa, continuous for 30 minutes, leakage ≤0.008%.

[0091] Fire simulation test: After being continuously burned by an 800℃ flame for 30 minutes, there was no visible leakage on the valve sealing surface, and the opening and closing function was normal.

[0092] Comparison data:

[0093] Traditional butterfly valve fire seal failure time: ≤10 minutes;

[0094] The fire seal maintenance time for this plan is ≥30 minutes.

[0095] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A high-performance fireproof butterfly valve, characterized in that, The device includes a valve body (1), a disc plate (2), and a sealing assembly disposed between the valve body (1) and the disc plate (2). The valve body (1) has a groove (3) that matches the sealing assembly. The disc plate (2) has a sealing slope (4) that is higher on the inside and lower on the outside facing the groove (3). The sealing assembly includes a soft sealing ring (5) and a metal fireproof sealing ring (6) arranged sequentially from the inside to the outside. The soft sealing ring (5) and the metal fireproof sealing ring (6) are fixed in the groove (3) by an outer pressure plate ring (7). The metal fireproof sealing ring (6) is inclined outward at the end facing the disc plate (2) to form a first slope (8). The soft sealing ring (5) has a second slope (9) that matches the first slope (8) on the side that connects with the metal fireproof sealing ring (6). The inclination angle of the second slope (9) is greater than that of the first slope (8).

2. The high-performance fireproof butterfly valve according to claim 1, characterized in that, The groove (3) includes a first groove (31) and a second groove (32) that are connected to each other. The second groove (32) is close to the disc plate (2). The first groove (31) is used to clamp the metal fireproof sealing ring (6). The second groove (32) is used to clamp the metal fireproof sealing ring (6) and the soft sealing ring (5).

3. A high-performance fireproof butterfly valve according to claim 2, characterized in that, The angle difference between the first inclined plane (8) and the second inclined plane (9) is 5~15°.

4. A high-performance fireproof butterfly valve according to claim 3, characterized in that, The first groove (31) is also provided with a fireproof pad (10), which is located between the metal fireproof sealing ring (6) and the valve body (1).

5. A high-performance fireproof butterfly valve according to claim 4, characterized in that, The soft sealing ring (5) is made of PTFE material, and the metal fireproof sealing ring (6) is made of stainless steel or nickel-based alloy.

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