High-temperature flue gas pipeline valve

Abstract

The present invention provides a high-temperature flue gas pipeline valve, which includes an annular valve body. A valve plate is arranged in the pipe cavity of the valve body. It is characterized in that: the valve plate shaft connected to the valve plate extends radially outward from the edge of the valve plate. There is a short pipe extending radially outward along the valve body on the valve body for the valve plate shaft to pass through. The outer end of the short pipe is connected with a shaft seat arranged outward. The valve plate shaft passes through the packing and bearing arranged in the shaft seat from the inside to the outside in sequence. Through holes radially penetrating the pipe wall of the shaft seat are arranged on the shaft seat between the packing and the short pipe, and the through holes are connected with a cooling gas source. Since a cooling gas source is arranged near the valve body on the pipe cavity passage through which the valve plate shaft passes to implement cooling, and the cooling gas is blown into the high-temperature flue pipe, it avoids the direct arrival of high-temperature flue gas at the sealing packing and bearing parts, protects the sealing packing and bearing from being heated by high-temperature flue gas, improves the working temperature environment of the sealing packing and bearing, and increases the service life of the sealing packing and bearing.

Description

Technical Field

[0001] The present invention belongs to the valve structure, specifically referring to a valve used on a high-temperature flue gas pipeline. Background Art

[0002] A large number of pneumatic control valves are used for process control on the high-temperature flue gas pipelines in the copper smelting industry. In the prior art, butterfly valves are mainly used for high-temperature flue gas valves. There is a stuffing box between the drive shaft connected to the valve core plate and the bearing seat, and the bearings are all relatively close to the valve body part. In the long-term high-temperature environment, the sealing material inside the stuffing box is prone to aging and corrosion, and the bearings are extremely easy to be damaged, resulting in valve jamming and seriously affecting work production. At the same time, due to the fixed design of the stuffing box, etc., replacing the internal packing requires the entire valve to be removed, which has high requirements for maintenance conditions and great difficulty in equipment maintenance.

[0003] The name is "Cold Shaft High-Temperature Butterfly Valve" (document number CN 203239948 U). In its technical solution, the support 1 is a tubular structure with an axial through hole. There are two supports 1, which are respectively sleeved on the valve plate shaft I 4 and the valve plate shaft II 9, and are in clearance fit with the valve plate shaft I 4 and the valve plate shaft II 9; the two supports 1 are fixedly connected to the valve body 3; the valve plate 6 is a hollow structure, the valve plate shaft I 4 and the valve plate shaft II 9 are tubes with axial through holes. One end of the valve plate shaft I 4 communicates with the cavity of the valve plate 6, and the other end is the cooling medium inlet, which is connected to the cooling medium pipeline; one end of the valve plate shaft II 9 communicates with the cavity of the valve plate 6, and the other end is the cooling medium outlet, which is connected to the discharge pipeline of the cooling medium; the valve plate shaft II 9 is connected to the transmission mechanism 8; the cooling medium can be water or air. The above solution aims to solve the cooling problem of the valve plate 6. However, in terms of the clearance fit between the valve plate shafts 4 and 9 and the support 1, the bearing components and sealing packing are not mentioned in the text, and this document does not provide corresponding solutions. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature flue gas pipeline valve to isolate high-temperature flue gas and prevent it from directly reaching the stuffing part, and reduce the thermal environment temperature of the stuffing and bearings.

[0005] A high-temperature flue gas pipeline valve includes an annular valve body, and a valve plate is arranged in the pipe cavity of the valve body. It is characterized in that: the valve plate shaft connected to the valve plate extends radially outward from the edge of the valve plate, and there is a short pipe extending radially outward along the valve body on the valve body for the valve plate shaft to pass through. The outer end of the short pipe is connected with a shaft seat arranged outward. The valve plate shaft passes through the stuffing and bearings arranged in the shaft seat from the inside to the outside in sequence. Through holes radially penetrating the pipe wall of the shaft seat are arranged on the shaft seat between the stuffing and the short pipe, and the through holes are connected to a cooling air source.

[0006] In the above technical solution, since a cooling air source is provided on the lumen passage through which the valve plate shaft passes and close to the valve body to implement cooling, the cooling gas is blown into the high-temperature flue pipe, preventing the high-temperature flue gas from directly reaching the sealing packing and bearing parts, protecting the sealing packing and bearing from being heated by the high-temperature flue gas, improving the working temperature environment of the sealing packing and bearing, and extending the service life of the sealing packing and bearing. Brief Description of the Drawings

[0007] Figure 1 is the front view of the present invention;

[0008] Figure 2 are respectively Figure 1 the A-A cross-sectional view in

[0009] Figure 3 、 4 are respectively Figure 2 the partial enlarged views of A and B in

[0010] Figure 5 is the partial three-dimensional schematic diagram of the shaft seat. Detailed Embodiment

[0011] As Figure 1 、 2 shown, the high-temperature flue gas pipeline valve includes an annular valve body 10. A valve plate 20 is arranged in the lumen of the valve body 10. The valve plate shaft 30 connected to the valve plate 20 extends radially outward from the edge of the valve plate 20. There is a short pipe 11 extending radially outward along the valve body 10 on the valve body 10 for the valve plate shaft 30 to pass through. An outer end of the short pipe 11 is connected outward with a shaft seat 40. The valve plate shaft 30 passes through the packing 50 and the bearing 60 arranged in the shaft seat 40 in sequence from the inside to the outside. A through hole radially penetrating the pipe wall of the shaft seat 40 is provided on the shaft seat 40 between the packing 50 and the short pipe 11, and the through hole is connected to a cooling air source.

[0012] In the above solution, the valve body 10 is connected to the high-temperature flue gas pipeline. The rotation of the valve plate shaft 30 drives the swing of the valve plate 20, thereby opening or closing the pipeline in the valve body 10, and further realizing the on-off control of the high-temperature flue gas pipeline. This is also the basic working principle of a conventional butterfly valve, which will not be elaborated here. As can be seen from the above technical solution, in the present invention, a cooling gas is introduced by opening a hole at an appropriate position on the shaft seat 40 of the valve plate shaft 30 outside the valve body 10. The position of the ventilation hole is selected on the pipe wall of the shaft seat 40 between the packing 50 and the short pipe 11. This position is between the high-temperature flue gas and the packing 50. Therefore, the high-temperature flue gas will be blocked by the cooling gas and cannot reach the position of the packing 50. Even if the valve plate shaft 30 and the valve plate 20 are in a high-temperature flue gas environment, the part of the valve plate shaft 30 located at the position of the through hole connected to the cooling gas source will necessarily be cooled, and its outer section temperature will also be significantly reduced. That is, the outer section temperature of the valve plate shaft 30 cooperating with the packing 50 and the bearing 60 is within a controllable range, so as not to cause high-temperature damage to the packing 50 and the bearing 60.

[0013] As a preferred solution, the shaft seat 40 is successively a cooling sleeve 41, a stuffing box seat 42, and a bearing seat 43 from the inside to the outside. A through hole 411 penetrating the sleeve wall is opened on the cooling sleeve 41, and the through hole 411 is connected to the cooling gas source. A packing 50 is arranged between the stuffing box seat 42 and the valve plate shaft 30, and a bearing 60 is arranged between the bearing seat 43 and the valve plate shaft 30.

[0014] The shaft seat 40 is divided into three relatively independent components, which is extremely convenient for processing, and is also beneficial for disassembly and installation. At the same time, heat insulation pads can be provided at the axial connection end faces of each component.

[0015] As a preferred solution, there is a lining sleeve 44 in the lumen of the cooling sleeve 41. There are holes 441 on the pipe wall of the lining sleeve 44, and the holes 441 are arranged in communication with the through hole 411. The lining sleeve 44 has a clearance fit with the valve plate shaft 30 and is in communication with the clearance between the valve plate shaft 30 and the short pipe 11. In order to ensure the normal rotation of the valve plate shaft 30 and at the same time be beneficial to blocking the high-temperature flue gas, a lining sleeve 44 is provided in the cooling sleeve 41, which can ensure the machining accuracy of the lining sleeve 44 and reduce the machining cutting workload. When the cooling gas reaches the annular clearance cavity between the lining sleeve 44 and the valve plate shaft 30 and between the valve plate shaft 30 and the short pipe 11, an annular air block is formed to block the overflow of the high-temperature flue gas.

[0016] As a preferred solution, the cooling sleeve 41 is of a plate-frame structure and a cooling sleeve pipe 412 is provided thereon. The through hole 411 is opened on the pipe wall of the cooling sleeve pipe 412. The plate-frame type cooling sleeve 41 is beneficial for its own cooling, and also facilitates the assembly of related components, and at the same time ensures its reliable support strength. Because the pipe diameter of the flue gas pipeline used for collecting the flue gas in the copper smelting process is generally large, the volume and weight of the valve are relatively large.

[0017] The stuffing box seat 42 has a plate-frame structure and is provided with a stuffing sleeve 421 thereon. There is a gland 422 and a retaining ring 423 at the outer end of the stuffing sleeve 421. The inner end of the gland 422 abuts against the outer end of the stuffing 50, and the retaining ring 423 is axially locked inwardly at the outer end of the gland 422. In the above solution, the gland 422 and the retaining ring 423 that restrain and fix the stuffing 50 are both detachable connection structures. The stuffing 50 and the bearing 60 are relatively easy-to-damage parts that require maintenance, and the above solution provides convenience for this.

[0018] The bearing seat 43 is a plate-frame-shaped body, and there is a cavity portion in the middle for accommodating and arranging the bearing 60.

[0019] In the above solution, both the stuffing box seat 42 and the bearing seat 43 have a plate-frame structure, and their functions are basically the same as those of the plate-frame structure of the cooling sleeve 41.

[0020] During specific implementation, there are two valve plate shafts 30 arranged concentrically and fixed in the diameter direction of the valve plate 20. The outer ends of the valve plate shafts 30 extending out of the shaft seat 40 are used to be connected to the power driving mechanism. The rotating shaft structure formed by the two valve plate shafts 30 can utilize the self-plate body of the valve plate 20 as a part of the rotating shaft, which can avoid the processing difficulty of slender shafts.

[0021] It should be noted that two sets of shaft seats 40 are correspondingly arranged at both ends of the valve plate shaft 30 formed by a long shaft structure or the two short shafts forming the valve plate shaft 30 shown in the embodiments of the drawings. The structures of the two sets of shaft seats 40 are basically the same.

Claims

1. A high-temperature flue gas pipeline valve, comprising an annular valve body (10), and a valve plate (20) is arranged in the pipe cavity of the valve body (10), characterized in that: The valve plate shaft (30) connected to the valve plate (20) extends radially outward from the edge of the valve plate (20). There is a short tube (11) on the valve body (10) that extends radially outward along the valve body (10) for the valve plate shaft (30) to pass through. An axle seat (40) is arranged and connected outward at the outer end of the short tube (11). The valve plate shaft (30) passes through the packing (50) and the bearing (60) arranged in sequence from the inside out in the axle seat (40). Through holes radially penetrating the tube wall of the axle seat (40) are provided on the axle seat (40) between the packing (50) and the short tube (11), and the through holes are connected to the cooling air source; The said axle seat (40) is, from the inside out, a cooling sleeve (41), a stuffing box seat (42), and a bearing seat (43) in sequence. Through holes (411) penetrating the sleeve wall are provided on the cooling sleeve (41), and the through holes (411) are connected to the cooling air source; There is a lining sleeve (44) in the tube cavity of the cooling sleeve (41). There are holes (441) on the tube wall of the lining sleeve (44) and the holes (441) are arranged in communication with the through holes (411). A clearance fit is provided between the lining sleeve (44) and the valve plate shaft (30) and it is in communication with the clearance between the valve plate shaft (30) and the short tube (11).

2. The high-temperature flue gas pipeline valve according to claim 1, wherein: The stuffing box seat (42) and the valve plate shaft (30) are arranged with packing (50) therebetween, and the bearing seat (43) and the valve plate shaft (30) are arranged with a bearing (60) therebetween.

3. The high-temperature flue gas pipeline valve according to claim 1, wherein: The cooling sleeve (41) is of a plate-frame structure and a cooling sleeve tube (412) is provided thereon. The through holes (411) are opened on the tube wall of the cooling sleeve tube (412).

4. The high-temperature flue gas pipeline valve according to claim 1, characterized in that: The stuffing box seat (42) is of a plate-frame structure and a stuffing box sleeve (421) is provided thereon. There is a gland (422) and a gland ring (423) at the outer end of the stuffing box sleeve (421). The inner end of the gland (422) presses against the outer end of the packing (50), and the gland ring (423) is axially locked inward at the outer end of the gland (422).

5. The high-temperature flue gas pipeline valve according to claim 1, characterized in that: The bearing seat (43) is a plate-frame-shaped body, and there is a cavity part in the middle for accommodating the bearing (60).

6. The high-temperature flue gas pipeline valve according to claim 1, characterized in that: There are two valve plate shafts (30) arranged concentrically and fixed in the diameter direction of the valve plate (20). The outer ends of the valve plate shafts (30) extending out of the axle seat (40) are used to be connected to the power driving mechanism.

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