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 valve shaft, the valve body comprises a pressing ring and a polytetrafluoroethylene sealing ring, the pressing ring is fixed on the valve body through a screw, a disc spring is further arranged between the screw and the pressing ring, the disc spring is used for pushing the pressing ring to move towards the direction of the valve body, and the pressing ring and the valve body clamp and fix the polytetrafluoroethylene sealing ring. A J-shaped metal sealing ring is further arranged on the pressing ring. According to the high-performance fireproof butterfly valve, the clamping ring with the J-shaped metal sealing ring structure is arranged, first sealing is formed on the basis of the polytetrafluoroethylene sealing ring, the butterfly valve is sealed during normal use, and after the polytetrafluoroethylene sealing ring of the butterfly valve in a fire disaster is burnt, the clamping ring is driven to be tightly attached to the valve body on the basis of the elastic force of the disc spring; the J-shaped metal sealing ring replaces a teflon sealing ring to provide secondary sealing and keep the sealing effect, so that leakage of the butterfly valve is avoided, and it is guaranteed that more serious crisis caused by serious leakage is avoided before maintenance personnel maintain the butterfly valve.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a high-performance fireproof butterfly valve. Background Art

[0002] The disc of the butterfly valve is a disc, which is installed in the diameter direction of the valve cavity. It rotates around its own axis in the cylindrical channel of the butterfly valve body to achieve the purpose of opening, closing or regulation. Its rotation angle is between 0 degrees and 90 degrees. When it rotates to 90 degrees, the valve is in a fully open state. The butterfly valve has a simple structure, small size, and simple operation. It can be opened and closed quickly and has good fluid control capabilities.

[0003] Butterfly valves are often used in pipelines for conveying various fluid media such as coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, etc. These fluid media are often flammable and explosive substances. For example, high-performance butterfly valve fluoroplastic seals, such as PTFE, RPTFE, etc., usually have a maximum operating temperature of ≤180℃, but there is no effective fireproof structure on the current butterfly valve. When a fire occurs in the pipeline system, the valve temperature rises, the sealing of the butterfly valve seal will deteriorate, and the flammable medium will leak from the butterfly valve, causing a fire outside the pipeline, which will cause great losses. Utility Model Content

[0004] In view of the prior art, the purpose of the utility model is to provide a high-performance fireproof butterfly valve with a double sealing structure, which can provide a secondary seal to maintain the sealing effect after the PTFE sealing ring of the butterfly valve is burned out, thereby avoiding leakage of the butterfly valve.

[0005] In order to achieve the above objectives, the technical solution adopted by the utility model is: a high-performance fireproof butterfly valve, comprising a valve body, a butterfly plate and a valve shaft, the valve shaft passes through the valve body and is connected and fixed on the butterfly plate, a sealing seat is arranged on the valve body, the sealing seat comprises a pressure ring and a polytetrafluoroethylene sealing ring, the pressure ring is fixed to the valve body by screws, a disc spring is also arranged between the screws and the pressure ring, the disc spring is used to push the pressure ring toward the valve body, the pressure ring and the valve body clamp and fix the polytetrafluoroethylene sealing ring, a J-shaped metal sealing ring is also arranged on the pressure ring, the polytetrafluoroethylene sealing ring and the J-shaped metal sealing ring are both provided with sealing mating surfaces matching the sealing surface of the butterfly plate.

[0006] As a further configuration of the above solution, the inner diameter of the sealing mating surface of the polytetrafluoroethylene sealing ring is set to be the same as that of the J-shaped metal sealing ring.

[0007] As a further configuration of the above scheme, a mounting groove is further provided on the valve body, a graphite sealing ring is provided in the mounting groove and is located between the pressure ring and the valve body, and the size of the graphite sealing ring is larger than the mounting groove.

[0008] As a further configuration of the above solution, the sealing surface and the sealing mating surface are both configured in an inclined structure, and the size of the polytetrafluoroethylene sealing ring is larger than the distance between the pressure ring and the valve body.

[0009] As a further configuration of the above solution, the travel of the disc spring elastically driving the pressure ring to move is greater than the installation distance between the pressure ring and the valve body.

[0010] Beneficial effect: The high-performance fireproof butterfly valve of the utility model is provided with a pressure ring with a J-shaped metal sealing ring structure, which forms a first seal based on the polytetrafluoroethylene sealing ring, and seals the butterfly valve in normal use. After the polytetrafluoroethylene sealing ring of the butterfly valve is burned in a fire, the pressure ring is driven to fit tightly against the valve body based on the elastic force of the disc spring, and the J-shaped metal sealing ring replaces the polytetrafluoroethylene sealing ring to provide a secondary seal to maintain the sealing effect, thereby avoiding leakage of the butterfly valve, and ensuring that no serious leakage will occur before maintenance personnel repair it, causing a more serious crisis. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the internal structure of the butterfly valve of the present utility model.

[0012] Figure 2 It is a structural schematic diagram of the butterfly valve of the utility model.

[0013] Figure 3 This is a schematic diagram of the normal use state of the butterfly valve of the utility model.

[0014] Figure 4 This is a schematic diagram of the state of the PTFE sealing ring of the butterfly valve of the utility model after burning.

[0015] Figure 5 It is a schematic diagram of the sealing state of the utility model butterfly valve after the polytetrafluoroethylene sealing ring is burned.

[0016] Figure numerals: 1, butterfly plate; 11, sealing surface; 2, PTFE sealing ring; 3, pressure ring; 4, graphite sealing ring; 5, screw; 6, disc spring; 7, valve body; 8, valve shaft; 9, J-type metal sealing ring. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] like Figure 1-5A high-performance fireproof butterfly valve shown in the figure includes a valve body 7, a butterfly plate 1 and a valve shaft 8. The valve shaft 8 passes through the valve body 7 and is connected and fixed on the butterfly plate 1. A sealing seat is provided on the valve body 7. The sealing seat includes a pressure ring 3 and a polytetrafluoroethylene sealing ring 2. The pressure ring 3 is fixed to the valve body 7 by a screw 5. A disc spring 6 is also provided between the screw 5 and the pressure ring 3. The disc spring 6 is used to push the pressure ring 3 toward the valve body 7. The pressure ring 3 and the valve body 7 clamp and fix the polytetrafluoroethylene sealing ring 2. A J-shaped metal sealing ring 9 is also provided on the pressure ring 3. The polytetrafluoroethylene sealing ring 2 and the J-shaped metal sealing ring 9 are both provided with sealing mating surfaces matching the sealing surface 11 of the butterfly plate 1.

[0019] As a further configuration of the above scheme, the inner diameter of the sealing mating surface of the PTFE sealing ring 2 is set to be the same as that of the J-shaped metal sealing ring 9. Figure 3 As shown, based on the existence of the installation spacing Y between the pressure ring 3 and the valve body 7, a spacing X is left between the J-type metal sealing ring 9 and the sealing surface 11 of the butterfly plate 1. At the same time, the relationship between Y and X is proportional. After Y returns to 0, X also returns to 0, as shown in FIG. Figure 5 shown.

[0020] As a further configuration of the above scheme, a mounting groove is further provided on the valve body 7, and a graphite sealing ring 4 is provided in the mounting groove and located between the pressure ring 3 and the valve body 7, and the size of the graphite sealing ring 4 is larger than the mounting groove.

[0021] As a further configuration of the above solution, the sealing surface 11 and the sealing mating surface are both configured in an inclined structure, and the size of the polytetrafluoroethylene sealing ring 2 is larger than the distance between the pressure ring 3 and the valve body 7 .

[0022] As a further configuration of the above solution, the disc spring 6 elastically drives the pressure ring 3 to move, which is greater than the installation distance Y between the pressure ring 3 and the valve body 7.

[0023] Embodiment: The fireproof butterfly valve of the utility model is provided with a double sealing structure. In normal working state, Figure 3 As shown, the screw 5 cooperates with the thread of the valve body 7, and the fixed pressure ring 3 and the valve body 7 clamp the polytetrafluoroethylene sealing ring 2 to seal the butterfly valve. When a fire occurs, the polytetrafluoroethylene sealing ring 2 melts at high temperature. Figure 4 As shown, based on the elastic force of the disc spring 6, the pressure ring 3 is pushed by the disc spring 6 to be close to the valve body 7. When the pressure ring 3 is close to the valve body 7, the J-shaped metal sealing ring 9 on the pressure ring 3 abuts against the butterfly plate 1 to form a second seal, and the graphite sealing ring 4 arranged between the pressure ring 3 and the valve body 7 can also enhance the sealing effect between the pressure ring 3 and the valve body 7. Figure 5 shown.

[0024] Combination Figure 3-5The butterfly valve of this embodiment has a disc spring 6 pre-installed between the pressure ring 3 and the screw 5, and a graphite sealing ring 4 pre-installed in the concave ring groove on one side of the valve body 7. The disc spring 6 and the graphite sealing ring 4 will not be burned under high temperature in a fire.

[0025] When the PTFE sealing ring 2 is burned, since the screw 5 is always fixed, the preload elastic thrust generated by the disc spring 6 will push the pressing ring 3 to move toward the concave surface of the valve body 7. Finally, the pressing ring 3 is completely in contact with the concave surface of the valve body 7 and the graphite sealing ring 4 and is pressed tightly. Figure 5 As shown;

[0026] At the same time, the J-shaped metal sealing ring 9 on the inner edge of the pressing ring 3 contacts and presses the sealing surface 11 of the butterfly plate 1. At this time, X=0, Y=0, and the J-shaped metal sealing ring 9 of the pressing ring 3 plays a sealing role.

[0027] like Figure 4-5 After the PTFE sealing ring 2 is burned in the fire, the J-type metal sealing ring 9 replaces the PTFE sealing ring 2 to play a sealing role, supporting the maintenance personnel to come to the butterfly valve for protection before maintenance, effectively preventing the leakage of the medium, thereby avoiding more serious safety accidents.

[0028] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high performance fireproof butterfly valve, characterized by: The valve body (7) comprises a valve body (7), a butterfly plate (1) and a valve shaft (8). The valve shaft (8) passes through the valve body (7) and is connected and fixed on the butterfly plate (1). The valve body (7) is provided with a sealing seat. The sealing seat comprises a pressing ring (3) and a polytetrafluoroethylene sealing ring (2). The pressing ring (3) is fixed to the valve body (7) by means of a screw (5). A disc spring (6) is further provided between the screw (5) and the pressing ring (3). The disc spring (6) is used to push the pressing ring (3) toward the valve body (7). The pressing ring (3) and the valve body (7) clamp and fix the polytetrafluoroethylene sealing ring (2). A J-shaped metal sealing ring (9) is further provided on the pressing ring (3). Both the polytetrafluoroethylene sealing ring (2) and the J-shaped metal sealing ring (9) are provided with sealing mating surfaces that match the sealing surface (11) of the butterfly plate (1).

2. A high performance fireproof butterfly valve according to claim 1, characterized in that: The inner diameter of the sealing matching surface of the polytetrafluoroethylene sealing ring (2) is set to be the same as that of the J-shaped metal sealing ring (9).

3. A high performance fireproof butterfly valve according to claim 1, characterized in that: The valve body (7) is also provided with a mounting groove, in which a graphite sealing ring (4) is provided between the pressure ring (3) and the valve body (7), and the size of the graphite sealing ring (4) is larger than that of the mounting groove.

4. A high performance fireproof butterfly valve according to claim 1, characterized in that: The sealing surface (11) and the sealing mating surface are both arranged in an inclined surface structure, and the size of the polytetrafluoroethylene sealing ring (2) is larger than the distance between the pressing ring (3) and the valve body (7).

5. A high performance fireproof butterfly valve according to claim 4, characterized in that: The disc spring (6) elastically drives the pressing ring (3) to move, and the travel is greater than the installation distance between the pressing ring (3) and the valve body (7).

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