High-temperature flue gas butterfly valve

Abstract

A high-temperature flue gas butterfly valve belongs to the technical field of valves and comprises a bottom cover, a graphite spiral-wound gasket, a split ring, a lower shaft sleeve, a valve body, a sliding bearing, a lower valve rod, a butterfly plate, an upper valve rod, an upper shaft sleeve, packing, a graphite ring, a spacer ring, a supporting ring, a lining, a packing pressing sleeve, a packing pressing plate, a support, a key, a shaft check ring and an executing mechanism. A bottom cover, a graphite spiral-wound gasket, a split ring, a lower shaft sleeve, a valve body, a sliding bearing, a lower valve rod, a butterfly plate, an upper valve rod, an upper shaft sleeve, packing, a graphite ring, a spacer ring, a supporting ring, a lining, a packing pressing sleeve, a packing pressing plate, a support, a key and a shaft check ring are installed together. The risk that the surface of the valve rod is scratched is reduced, the torque of opening and closing operation can be reduced, normal operation of the valve is guaranteed, and the service life of the valve is prolonged; the risk of medium leakage can be reduced; the butterfly plate and the valve rod are connected through a spline, the bearing capacity is high, transmission is stable, durability is good, the butterfly valve is more efficient in the manufacturing and installing process, and product safety and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a high-temperature flue gas butterfly valve. Background Technology

[0002] The flue gas butterfly valve is a key piece of equipment designed for industrial flue gas treatment systems. It boasts advantages such as low flow resistance, high flow capacity, rapid opening and closing, wide applicability, and high-temperature resistance, making it widely used in ventilation, environmental protection projects, and flue gas treatment pipeline systems in industries such as petroleum, chemical, power, steel, and pharmaceuticals. In these applications, the flue gas butterfly valve plays a crucial role in ensuring the normal operation of the pipeline system and effective flow control of the medium.

[0003] The existing flue gas butterfly valve generally includes a valve body, a butterfly plate, a valve stem, and a manual, electric, or pneumatic drive mechanism. During operation, the drive mechanism drives the butterfly plate to rotate via the valve stem, thereby regulating (including closing) the flow rate of the medium flowing through the valve body. Although the existing flue gas butterfly valve meets the needs of controlling the flow rate of the medium to a certain extent, due to structural limitations, it still has the following defects in use. (1) When the grease in the bearing between the valve stem and the fixed part at the upper end of the valve body is insufficient, it is necessary for the operator to manually disassemble the bearing (sliding bearing) and the valve stem, and then inject grease into the bearing. The disassembly process is complicated and not conducive to the maintenance and replacement of the valve, and it will also result in relatively low work efficiency. (2) The butterfly plate and valve stem are fixedly connected by keyways or pins. Under the influence of high-temperature media, keyways or pins may fall off or loosen. In addition, after long-term use, the valve stem and bearing installation structure may not be tightly sealed, allowing external particulate media to easily enter the contact surface between the sliding bearing and the valve stem, causing the valve stem to jam or scratch its surface, severely reducing the service life of the flue gas butterfly valve. In summary, due to the above-mentioned defects, the existing flue gas butterfly valves limit their application and reliability under complex working conditions. Therefore, it is particularly necessary to provide a flue gas butterfly valve that can work stably and is easy to maintain under various working conditions. Utility Model Content

[0004] To overcome the shortcomings of existing flue gas butterfly valves due to structural limitations, as described in the background art, this utility model provides a high-temperature flue gas butterfly valve with a compact structure, high temperature resistance, wear resistance, convenient lubrication, and good sealing performance. It can also effectively prevent valve stem jamming caused by external particulate media eroding the sliding bearing. It is easier and more reliable to assemble and maintain, bringing convenience to the disassembly and maintenance of the equipment and ensuring reliable and stable operation of the equipment.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A high-temperature flue gas butterfly valve includes a bottom cover, a graphite spiral wound gasket, a split ring, a lower bushing, a valve body, a sliding bearing, a lower valve stem, a butterfly plate, an upper valve stem, an upper bushing, packing, a graphite ring, a spacer ring, a support ring, a bushing, a packing sleeve, a packing pressure plate, a bracket, a key, a shaft retaining ring, and an actuator. A lower fixed seat is fixedly installed at the lower end of the valve body, and the bottom cover is fixedly installed at the lower end of the lower fixed seat. The graphite spiral wound gasket is fixedly installed between the upper end of the bottom cover and the lower end of the lower fixed seat. The first sliding bearing is located on the outer side of the lower bushing. The valve body is fixedly installed in the lower fixed seat. The upper end of the lower valve stem and the lower end of the butterfly plate are fixedly installed together. The lower end of the lower valve stem is rotatably installed in the first sliding bearing and the lower bushing. The split ring rotates to fit around the lower bottom end of the lower valve stem. There is a lower purge hole on the side of the lower fixed seat between the lower end of the first sliding bearing and the lower bushing. The upper part of the butterfly plate is fixedly installed with a mounting seat. The inner side of the mounting seat has a spline groove. The upper end of the valve body is fixedly installed with an upper fixed seat. The lower end of the second sliding bearing is fixedly installed in the lower end of the upper fixed seat. The outer sides of the upper bushing, support ring, and bushing are fixedly installed on the inner side of the upper fixed seat. The outer sides of the first graphite ring, spacer ring, and second graphite ring are fixedly installed on the inner side of the support ring. The packing is installed inside the bushing. The packing gland is fitted onto the upper end of the bushing. The upper end of the packing gland is fixedly installed on the upper outer end of the bushing. The upper valve stem is rotatably fitted inside the packing gland, packing gland, second graphite ring, spacer ring, first graphite ring, upper bushing, and second sliding bearing. The lower end of the upper valve stem has a spline, and the spline at the lower end of the upper valve stem is fixed. The upper bushing is fixedly installed in the spline groove of the upper fixed seat; the upper bushing has an upper purging channel, and grease injection ports are distributed on the outer side of the spacer ring; the lower end of the bracket is fixedly installed on the upper outer side of the upper fixed seat, the drive shaft of the actuator and the top end of the upper valve stem are fixedly installed together, multiple keys are installed between the upper end of the upper valve stem and the drive shaft of the actuator, the upper end of the bracket is fixedly installed on the lower outer side of the actuator housing, the upper valve stem has an annular ring at the lower end of the actuator, and the inner side of the shaft retaining ring is fixedly installed in the annular ring.

[0007] Furthermore, the outer diameter of the split ring is larger than the outer diameter of the lower valve stem and the lower bushing, while the inner diameter is smaller than the outer diameter of the lower bushing.

[0008] Furthermore, the outer diameter of the retaining ring is larger than the inner diameter of the shaft hole at the upper end of the bracket, and the lower end is spaced apart from the upper end of the bracket.

[0009] Furthermore, the graphite ring is composed of stainless steel wire and flexible graphite braided filler.

[0010] Furthermore, the inner side of the first sliding bearing and the outer side of the lower valve stem are in a contact rotation structure.

[0011] Furthermore, the inner side of the graphite packing and the upper valve stem are in a rotating contact fit structure, and the inner side of the second sliding bearing and the outer side of the upper valve stem are in a contact rotation structure.

[0012] Furthermore, the drive shaft of the actuator can be either manually rotated or driven by mechanical power.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model sets flexible graphite packing + spacer ring on the valve stem and valve body. The flexible graphite packing fits the valve stem surface to play a sealing and lubricating role (and has a grease injection port). It can reduce the friction between the valve stem and the valve body during the opening and closing process, greatly reduce the risk of the valve stem surface being scratched, make the valve stem seal reliable for a long time, and also play a guiding role. This can greatly improve the performance of the valve sealing packing and reduce the risk of process medium leakage. At the same time, since there is a purge port, air can be blown into the bushing to blow impurities in the conveying medium into the flow channel (pipeline), further reducing the risk of the valve stem surface being scratched. (2) By setting shaft ends that cooperate with sliding bearings on the upper and lower valve stems, the valve stem can effectively reduce the friction with the valve body contact surface during opening or closing, reduce the torque of opening and closing operation, ensure the normal operation of the valve, and extend the service life of the valve; (3) The valve body has a sealing cone surface welded inside, and the sealing cone surface has hard alloy, which is hardened to enhance wear resistance and impact resistance, extend service life, and reduce the risk of medium leakage; (4) The butterfly plate and valve stem are connected by a spline, which has strong load-bearing capacity, smooth transmission, and good durability, making the butterfly valve more efficient in manufacturing and installation, and improving the safety and reliability of the product. In summary, this utility model has good application prospects. Attached Figure Description

[0014] Figure 1 This is an overall sectional view of the present invention.

[0015] Figure 2 , 3 Figure 4 is a partially enlarged structural schematic diagram of the utility model. Detailed Implementation

[0016] Figure 1 , 2As shown in Figures 3 and 4, the high-temperature flue gas butterfly valve includes a bottom cover 1, a flexible graphite spiral wound gasket 3, a split ring 4, a lower bushing 5, a valve body 6, a sliding bearing 2, a lower valve stem 7, a butterfly plate 8, an upper valve stem 9, an upper bushing 10, a metal wire and flexible graphite braided packing 11, a flexible graphite ring 27, a spacer ring 12, a support ring 13, a bushing 14, a packing pressure sleeve 15, a packing pressure plate 16, bolts and nuts 17, a disc spring 18, a bracket 19, a key 20, a shaft retaining ring 21, an elastic sealing ring 22, and an actuator 23. A hollow lower fixed seat, communicating with the interior of the valve body 6, is installed externally at the lower center. The upper end of the bottom cover 1 is fixedly and sealed to the lower fixed seat by bolts and nuts. At the lower end, a hollow graphite spiral wound gasket 3 is fixedly installed between the upper end of the bottom cover and the lower end of the lower fixed seat. The outer sides of the first sliding bearing 2 and the lower bushing 5 are fixedly installed at the upper and lower ends of the lower fixed seat, respectively. The upper end of the lower valve stem 7 and the lower middle part of the butterfly plate 8 are fixedly installed together. The lower end of the lower valve stem 7 is rotatably installed inside the first sliding bearing 2 and the lower bushing 5. The split ring 4 rotates to fit around the lower bottom end of the lower valve stem 7. There is a lower purge hole on each side of the lower fixed seat between the lower end of the first sliding bearing 2 and the lower bushing 5. A lower air intake pipe 24, which communicates with the interior, is fixedly installed on the left outer side of the lower purge hole (the outer side can be connected to the air compressor exhaust pipe; when the air compressor valve is opened, compressed air enters). The first sliding bearing 2 is inserted between the lower end of the first sliding bearing 2 and the lower bushing 5 to blow impurities in the conveying medium into the flow channel (pipeline), reducing the risk of scratches on the surface of the lower valve stem 7, etc. A mounting seat with an open upper end is fixedly installed on the upper center of the butterfly plate 8. The mounting seat has a spline groove 25 on its inner side. A hollow upper fixed seat 26 communicating with the interior is installed on the outer side of the upper center of the valve body 6. The lower end of the second sliding bearing 2 is fixedly installed inside the lower end of the upper fixed seat 26. The outer sides of the upper bushing 10, support ring 13, and bushing 14 are fixedly installed from bottom to top on the inner center and upper end of the upper fixed seat 26, respectively. The first graphite ring 27, spacer ring 12, and second graphite ring 27... The outer side is fixedly installed on the inner side of the support ring 13 from bottom to top. The metal wire and flexible graphite braided packing 11 are installed on the inner side of the bushing 14. The packing pressure sleeve 15 is sleeved on the upper end of the bushing 14. The upper end of the packing pressure plate 16 is fixedly installed on the upper end of the bushing 14 and located on the upper part of the packing pressure sleeve 15 by bolts and nuts 17 (the disc spring 18 is located at the lower end of the bolt 17). The upper valve stem 12 rotates from top to bottom and is sleeved in the packing pressure plate 16, the packing pressure sleeve 15, the second graphite ring 27, the spacer ring, the first graphite ring 27, the upper bushing 10, and the second sliding bearing 2. The lower end of the upper valve stem 9 has a spline. The spline at the lower end of the upper valve stem 9 is tightly fixedly installed in the spline groove 25 of the upper fixed seat.The upper bushing has an annular upper purge channel in its middle. At the left and right ends of the upper purge channel, the upper fixed seat has an upper purge hole. At the side ends of the upper purge holes at the left and right ends of the upper fixed seat, there is an opening. An upper air inlet pipe 28, communicating with the interior, is installed in the middle of the outer side of the left opening (the outer side can be connected to an air compressor and exhaust pipe; when the air compressor valve is opened, compressed air enters between the second sliding bearing 2 and the upper bushing 10, blowing impurities in the conveying medium into the flow channel (pipeline), reducing the wear probability of the upper valve stem 9 and the upper bushing 10, etc.). A concave grease inlet is annularly distributed on the outer side of the spacer ring. At the left and right ends of the grease inlet, the support ring and the left and right ends of the upper fixed seat each have an opening. An opening is provided on the left side, with a grease injection tube 29 connected to the opening's interior (allowing for the injection of lubricating grease into the upper valve stem and other corresponding parts via a grease gun, etc.). The lower end of the bracket 19 is fixedly installed on the upper outer side of the upper fixed seat 26. The drive shaft of the actuator 23 and the upper end of the upper valve stem 9 are fixedly installed together. Multiple keys 20 (for fixing and limiting) are installed between the upper end of the upper valve stem 9 and the drive shaft of the actuator 23. The upper end of the bracket 19 is fixedly installed on the lower middle part of the actuator 23's housing. The upper valve stem 9 has a concave annular ring at the lower end of the actuator. A shaft retaining ring 21 is tightly fitted and fixed inside the annular ring. The upper end of the bracket 19 is located below the shaft retaining ring 21. A disc spring 18 is located between the packing sleeve 15 and the packing plate 16.

[0017] Figure 1 , 2 As shown in Figures 3 and 4, the outer diameter of the open ring 4 is larger than the outer diameter of the lower valve stem 7 and the lower bushing 5, while its inner diameter is smaller than the outer diameter of the lower bushing 5. The outer diameter of the shaft retaining ring 21 is larger than the inner diameter of the shaft hole at the middle of the upper end of the bracket 19, and its lower end is spaced apart from the upper end of the bracket 19. The graphite ring 27 is a combination of stainless steel wire and flexible graphite braided packing. The inner side of the first sliding bearing 5 and the outer side of the lower valve stem 7 are in contact rotation structure.

[0018] The inner side of the graphite packing 11 and the upper valve stem 9 are in a rotating contact fit structure, and the inner side of the second sliding bearing 2 and the outer side of the upper valve stem 9 are in a contact rotation structure. The drive shaft of the actuator 23 is driven by either manual rotation or mechanical power (such as an electric motor, pneumatic motor, etc.). The valve body 6 has a sealing cone surface welded inside, and the sealing cone surface has a hard alloy that has been hardened.

[0019] Figure 1 , 2As shown in Figures 3 and 4, before use, the left and right ends of the valve body 6 are connected to the medium output pipeline and the medium input end of the next process production equipment via pipelines, respectively. The two ends of the servo mechanism's fixing frame are fixedly installed in the relevant positions. During use, the drive shaft of the actuator drives the butterfly plate 8 to rotate via the upper valve stem 9, and the lower valve stem 7 rotates along the lower bushing 5, thereby adjusting the flow rate of the medium flowing through the valve body (including closing). This utility model has the following advantages. (1) The upper valve stem 9 and the lower valve stem 7 are made of high-temperature resistant and corrosion-resistant high-performance materials, which enhances their service life and stability in high-temperature and corrosive environments. (2) The bottom of the upper valve stem 9 is provided with multiple protruding splines, and the butterfly plate is provided with corresponding slots 25. The splines and slots fit tightly together. Since the butterfly plate and valve stem are connected by splines, it is more convenient to separate and connect them, and the installation is more stable. The bearing capacity is strong, the transmission is smooth, and the durability is good, making the butterfly valve more efficient in the manufacturing and installation process and improving the safety and reliability of the product. (3) A keyway is provided at the top of the upper valve stem to facilitate connection with external transmission equipment. A shaft retaining ring 21 (for limiting) is provided at the top of the upper valve stem, which can form an anti-flyout structure with the bracket 19 to prevent the upper valve stem from being pushed upward due to excessive pressure in the flow channel, thus damaging the actuator. (4) Stepped surfaces (upper fixed seat and lower fixed seat) are provided at the upper and lower parts of both ends of the valve body 5. Sliding bearings 2 are provided between the stepped holes at both ends of the valve body and the valve stem. Both sliding bearings 2 are installed on the outside of the valve stem, which can support, limit and guide the upper and lower valve stems. (5) The flexible graphite packing is tightly attached to the inner wall of the support ring and fits against the surface of the valve stem to achieve a seal. At the same time, the flexible graphite packing plays a guiding role. An annular groove is provided on the spacer ring, and the grease adding device is set on the surface of the support ring. The outlet hole of the grease adding device is connected to the annular groove, which facilitates the addition of grease. The structure is convenient and simple to operate, and prevents the leakage of lubricating grease in the sliding bearing. It can reduce the friction between the valve stem and the valve body during the opening and closing process, greatly reducing the risk of the valve stem surface being scratched, making the valve stem seal reliable for a long time. It can also play a guiding role, which can greatly improve the performance of the valve sealing packing and reduce the risk of process medium leakage. At the same time, because it has a purge port, it can blow air into the bushing to blow impurities in the conveying medium into the flow channel (pipeline), further reducing the risk of the valve stem surface being scratched. (6) A bushing is provided on the valve body. Flexible graphite packing, packing sleeve and packing plate are provided between the bushing and the upper valve stem. An elastic sealing ring is provided between the bushing and the valve body to prevent lubricating grease leakage. It is fastened to the top end face of the valve body with bolts and nuts to prevent movement and enhance its stability. At the same time, the bushing plays a guiding role to prevent external media and dust from entering the valve body.(7) The valve body is internally welded with a sealing cone surface, which is hardened with hard alloy to enhance its wear resistance and impact resistance, reduce the risk of leakage, and extend its service life; the butterfly plate is machined with a sealing cone surface on its arc side wall, which is welded with hard alloy and wedges with the valve body sealing surface; a spiral wound gasket is provided between the valve body and the bottom cover to improve the sealing performance of the device and prevent high-temperature flue gas leakage. By setting shaft ends that cooperate with sliding bearings on the upper and lower valve stems, the valve stem can effectively reduce the friction with the valve body contact surface during opening or closing, reduce the torque of opening and closing operation, ensure the normal operation of the valve, and extend the service life of the valve body.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0021] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high temperature flue gas butterfly valve comprising a bottom cover, a graphite winding gasket, a split ring, a lower shaft sleeve, a valve body, a sliding bearing, a lower valve stem, a butterfly plate, an upper valve stem, an upper shaft sleeve, packing, a graphite ring, a spacer ring, a support ring, a bushing, a packing sleeve, a packing plate, a bracket, a key, a shaft retainer, an actuator, characterized in that, The lower end of the valve body is fixedly installed with a lower fixed seat, the bottom cover is fixedly installed at the outer lower end of the lower fixed seat, the graphite winding gasket is fixedly installed between the upper end of the bottom cover and the lower end of the lower fixed seat, the first sliding bearing and the lower shaft sleeve are fixedly installed at the inner side of the lower fixed seat respectively, the lower end of the lower valve rod and the lower end of the butterfly plate are fixedly installed together, the lower end of the lower valve rod is rotatably installed in the first sliding bearing and the lower shaft sleeve, the split ring is sleeved on the lower bottom end of the lower valve rod, the lower blowhole is arranged between the lower end of the first sliding bearing and the lower shaft sleeve at the side of the lower fixed seat; the mounting seat is fixedly installed at the upper part of the butterfly plate, the spline notch is arranged at the inner side of the mounting seat, the upper fixed seat is fixedly installed at the outer upper end of the valve body, the lower end of the second sliding bearing is fixedly installed at the inner lower end of the upper fixed seat, the outer side of the first graphite ring, the spacer ring and the second graphite ring are fixedly installed at the inner side of the support ring respectively, the packing is installed at the inner side of the bushing, the packing pressing sleeve is sleeved on the upper end of the bushing, the upper side end of the packing pressing plate is fixedly installed at the outer upper end of the bushing, the upper valve rod is rotatably sleeved in the packing pressing plate, the packing pressing sleeve, the second graphite ring, the spacer ring, the first graphite ring, the upper shaft sleeve and the second sliding bearing, the spline is arranged at the lower end of the upper valve rod, and the spline at the lower end of the upper valve rod is fixedly installed in the spline notch of the upper fixed seat; the upper shaft sleeve has the upper blowhole, and the grease injection ports are arranged at the outer side of the spacer ring; the bracket is fixedly installed at the outer side of the upper end of the upper fixed seat at the lower side end, the transmission shaft of the actuator and the top end of the upper valve rod are fixedly installed together, a plurality of keys are arranged between the upper end of the upper valve rod and the transmission shaft of the actuator, the bracket is fixedly installed at the lower end of the housing of the actuator at the upper side end, and the annular ring is arranged at the position of the lower end of the actuator, and the shaft stop ring is fixedly installed in the annular ring.

2. The high temperature flue gas butterfly valve of claim 1, wherein, The outer diameter of the split ring is greater than the outer diameters of the lower valve rod and the lower shaft sleeve, and the inner diameter of the split ring is less than the outer diameter of the lower shaft sleeve.

3. The high temperature flue gas butterfly valve of claim 1, wherein, The outer diameter of the shaft stop ring is greater than the inner diameter of the shaft hole of the upper side end of the bracket, and the lower end of the shaft stop ring is spaced apart from the upper side end of the bracket.

4. The high temperature flue gas butterfly valve of claim 1, wherein, The graphite ring is composed of a stainless steel wire and a flexible graphite woven packing.

5. The high temperature flue gas butterfly valve of claim 1, wherein, The inner side of the first sliding bearing and the outer side of the lower valve rod are in contact and rotation structure.

6. The high temperature flue gas butterfly valve of claim 1, wherein, The inner side of the graphite packing and the upper valve rod are in rotation and contact structure, and the inner side of the second sliding bearing and the outer side of the upper valve rod are in contact and rotation structure.

7. The high temperature flue gas butterfly valve of claim 1, wherein, The transmission shaft of the actuator is one of manual rotation and mechanical power driving.

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