A high-temperature sealing triple eccentric butterfly valve

Abstract

This utility model provides a high-temperature sealing triple eccentric butterfly valve, which exhibits high stability under high-temperature conditions. It includes a valve shaft, a valve body, and a valve plate. The top and bottom of the valve body have mounting holes for connecting the shaft. A fluid channel penetrating the valve body is formed in the middle. The valve plate is installed within the valve body. The valve shaft passes through the mounting holes, through a stuffing box and a bearing bracket, and connects to the valve plate located within the fluid channel. The mounting holes at the top and bottom of the valve body are connected to heat insulation seats. Dustproof rings and spacers fitted onto the valve shaft are installed on the inner sides of the two heat insulation seats. Heat dissipation valve covers are bolted to the ends of the two heat insulation seats furthest from the valve body. Heat dissipation fins are provided in the middle of each of the two heat dissipation valve covers. A stuffing box is provided at the end of each heat dissipation valve cover furthest from the valve body. Heat-insulating bearing brackets are also bolted to the ends of the two heat-insulating valve covers furthest from the valve body. A first heat-insulating cavity is formed in the middle of each of the two heat-insulating bearing brackets.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a high-temperature sealing triple eccentric butterfly valve. Background Technology

[0002] Valves in the metallurgical industry operate under complex and diverse conditions, involving extreme environments such as high temperature, high pressure, corrosive media, dust, and particulate matter. Blast furnaces, converters, continuous casting furnaces, and steel rolling heating furnaces are characterized by high-temperature conditions, and existing butterfly valves used in these high-temperature environments include... Figure 1 , Figure 2 As shown, a butterfly valve includes a valve shaft 2, a valve body 1, and a valve plate 3. The valve body 1 has mounting holes at its top and bottom for connecting the shaft. The top mounting hole of the valve body 1 connects to a stuffing box 5, and the bottom mounting hole of the valve body 1 connects to a bearing mounting seat 6. A fluid channel 4 is formed through the middle of the valve body 1. The valve plate 3 is installed inside the valve body 1. The valve shaft 2 passes through the stuffing box 5 and the bearing mounting seat 6 via the mounting holes and connects to the valve plate 3 located within the fluid channel 4. The portion of the valve shaft 2 within the bearing seat is fitted with, from top to bottom, a protective ring 7, an inner bearing 8, a thrust plate 9, an opening / closing ring 10, and a thrust bearing 11. A bottom cover is bolted to the bottom surface of the bearing mounting seat 6, and the bottom cover and the bearing seat are sealed by a spiral wound gasket 13.

[0003] However, the bearings of this type of butterfly valve are often affected by heat sources passing through the fluid channel, making them prone to problems such as thermal fatigue, expansion jamming, and high-temperature oxidation, which greatly reduces the stability of the butterfly valve. Summary of the Invention

[0004] In view of the shortcomings of existing high-temperature butterfly valves, such as bearings being prone to thermal fatigue, expansion and jamming, and high-temperature oxidation leading to low stability, this utility model provides a high-temperature sealing triple eccentric butterfly valve, which has high stability under high-temperature conditions.

[0005] A high-temperature sealing triple eccentric butterfly valve includes a valve shaft, a valve body, and a valve plate. The valve body has mounting holes at its top and bottom for connecting the shaft. A fluid channel penetrating the valve body is formed in the middle of the valve body. The valve plate is mounted within the valve body. The valve shaft passes through a stuffing box and a bearing bracket via mounting holes and connects to the valve plate located within the fluid channel. The valve body is characterized in that: the mounting holes at its top and bottom are respectively connected to heat insulation seats; dustproof rings and spacers fitted onto the valve shaft are respectively installed on the inner sides of the two heat insulation seats; and heat dissipation valve covers are respectively bolted to the ends of the two heat insulation seats furthest from the valve body. Each of the two heat dissipation valve covers has a heat dissipation fin in its middle portion, and a stuffing box is provided at the end of each of the two heat dissipation valve covers away from the valve body. A heat-insulating bearing bracket is also bolted to the end of each of the two heat-insulating valve covers away from the valve body. A first heat-insulating cavity is provided in the middle portion of each of the two heat-insulating bearing brackets. A bearing seat is installed at the end of each of the two heat-insulating bearing brackets away from the valve body. A deep groove ball bearing is installed inside each of the two bearing seats. A bearing cover is installed at the end of each of the two deep groove ball bearings away from the valve body. The two bearing covers are fixedly installed to the bearing seats by screws.

[0006] Its further features are:

[0007] A bottom support frame is bolted to the bottom surface of the heat-insulating bearing bracket on one side of the valve body. A second heat-insulating cavity is formed in the middle of the support frame. A clearance hole is formed in the bottom plate of the bottom support frame. The bottom end of the valve shaft extends into the clearance hole. An annular groove is formed in the bottom end of the valve shaft. The inner diameter of the clearance hole is larger than the outer diameter of the valve shaft at the location of the annular groove and smaller than the outer diameter of the rest of the valve shaft. A butterfly spring fitted onto the valve shaft is installed in the annular groove. The butterfly spring is pressed between the top surface of the annular groove and the bottom plate of the bottom support frame.

[0008] With the above-described structure of this invention, the heat insulation seat, the heat dissipation valve cover, and the first heat insulation cavity isolate the deep groove ball bearing from the fluid channel. The heat dissipation valve cover dissipates heat to the external environment, preventing the deep groove ball bearing from being affected by heat sources and causing problems such as thermal oxidation, expansion jamming, and thermal fatigue, thus improving the stability of the butterfly valve under high-temperature conditions. The clearance hole and the butterfly spring can compensate for the displacement caused by the thermal expansion of the valve shaft, further improving the stability of the butterfly valve under high-temperature conditions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the existing technology;

[0010] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0011] Figure 3 This is a schematic diagram of the structure of this utility model;

[0012] Figure 4 for Figure 3 Enlarged view of point B in the middle. Detailed Implementation

[0013] See Figure 3 , Figure 4 A high-temperature sealed triple eccentric butterfly valve includes a valve shaft 2, a valve body 1, and a valve plate 3. The top and bottom of the valve body 1 are respectively provided with mounting holes for connecting the shaft to extend into. A fluid channel 4 is provided in the middle of the valve body 1. The valve plate 3 is installed inside the valve body 1. The valve shaft 2 passes through the mounting holes, through the stuffing box 17 and the bearing bracket 16, and is connected to the valve plate 3 located in the fluid channel 4. The mounting holes at the top and bottom of the valve body 1 are respectively connected to heat insulation seats 14. Dustproof rings 25 and spacers 24 fitted on the inner sides of the two heat insulation seats 14 are respectively installed on the valve shaft 2 to isolate the heat in the fluid channel 4 from the bearing.

[0014] Two heat insulation seats 14 are respectively installed with heat dissipation valve covers 15 by bolts at the ends away from the valve body 1. The middle part of the two heat dissipation valve covers 15 is provided with heat dissipation fins 23, which can dissipate heat to the surrounding air and further prevent the bearing from overheating.

[0015] Two heat dissipation valve covers 15 are respectively provided with stuffing boxes 17 at the ends away from the valve body 1, which are used to seal between the valve cover and the valve shaft 2.

[0016] The ends of the two heat dissipation valve covers 15 away from the valve body 1 are respectively bolted to the heat insulation bearing brackets 16. The middle parts of the two heat insulation bearing brackets 16 are respectively provided with first heat insulation chambers 20 to prevent the bearing from getting hot by isolating the heat-conducting medium.

[0017] Two heat-insulated bearing brackets 16 are each fitted with a bearing housing 26 at the end furthest from the valve body 1. Deep groove ball bearings 22 are installed within each bearing housing 26. Bearing covers 27 are fitted to the ends of each deep groove ball bearing 22 furthest from the valve body 1, and the two bearing covers 27 are fixed to the bearing housings 26 with screws. Installing the bearings away from the valve body 1 ensures that the bearings will not be subjected to heat, preventing problems such as thermal oxidation, expansion seizure, and thermal fatigue.

[0018] A bottom support frame 18 is bolted to the bottom surface of the heat-insulating bearing bracket 16 on one side of the valve body 1. A second heat-insulating cavity 21 is formed in the middle of the bottom support frame 18. A relief hole 19 is formed in the bottom plate of the bottom support frame 18. The bottom end of the valve shaft 2 extends into the relief hole 19. An annular groove 28 is formed in the bottom end of the valve shaft 2. The inner diameter of the relief hole 19 is larger than the outer diameter of the valve shaft 2 at the location of the annular groove 28 and smaller than the outer diameter of the rest of the valve shaft 2. A butterfly spring 29 is installed in the annular groove 28 and fitted onto the valve shaft 2. The butterfly spring 29 is pressed between the top surface of the annular groove 28 and the bottom plate of the bottom support frame 18. When the valve shaft 2 expands due to heat, it presses down on the butterfly spring 29 and further extends into the relief hole 19, compensating for the displacement caused by the deformation of the valve shaft 2, and further improving the stability of the butterfly valve under high-temperature conditions.

Claims

1. A high-temperature sealing triple eccentric butterfly valve, comprising a valve shaft, a valve body, and a valve plate, wherein the top and bottom of the valve body are respectively provided with mounting holes for connecting the shaft to extend into, a fluid passage penetrating the valve body is provided in the middle of the valve body, the valve plate is installed in the valve body, and the valve shaft passes through the mounting holes through the stuffing box and bearing bracket, and is connected to the valve plate located in the fluid passage, characterized in that: The top and bottom mounting holes of the valve body are respectively connected to heat insulation seats. Dustproof rings and spacers fitted onto the valve shaft are respectively installed on the inner sides of the two heat insulation seats. Heat dissipation valve covers are respectively installed on the ends of the two heat insulation seats away from the valve body by bolts. Heat dissipation fins are respectively provided in the middle of the two heat dissipation valve covers. Stuffing glands are respectively provided on the ends of the two heat dissipation valve covers away from the valve body. Heat insulation bearing brackets are also respectively installed on the ends of the two heat dissipation valve covers away from the valve body by bolts. First heat insulation cavities are respectively opened in the middle of the two heat insulation bearing brackets. Bearing seats are respectively installed on the ends of the two heat insulation bearing brackets away from the valve body. Deep groove ball bearings are respectively installed in the two bearing seats. Bearing covers are respectively installed on the ends of the two deep groove ball bearings away from the valve body. The two bearing covers are respectively fixed to the bearing seats by screws.

2. The high-temperature sealing triple eccentric butterfly valve according to claim 1, characterized in that: A bottom support frame is bolted to the bottom surface of the heat-insulating bearing bracket on one side of the bottom of the valve body. A second heat-insulating cavity is opened in the middle of the bottom support frame. A clearance hole is opened in the bottom plate of the bottom support frame. The bottom end of the valve shaft extends into the clearance hole. An annular groove is opened in the bottom end of the valve shaft. The inner diameter of the clearance hole is larger than the outer diameter of the valve shaft at the opening of the annular groove and smaller than the outer diameter of the rest of the valve shaft. A butterfly spring is installed in the annular groove and fitted onto the valve shaft. The butterfly spring is pressed between the top surface of the annular groove and the bottom plate of the bottom support frame.

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