Cinder valve

Abstract

The utility model provides a cinder valve which comprises a valve body and a rotating shaft with rotating blades, the rotating shaft is arranged in the valve body, and the end portion of the rotating shaft penetrates through the valve body. A sealing assembly is arranged on the rotating shaft located outside the valve body, the sealing assembly is close to the connecting position of the valve body and the rotating shaft, the sealing assembly comprises an inner sleeve, a bearing bush assembly and an outer sleeve, the rotating shaft is sleeved with the inner sleeve, a plurality of protrusions are arranged on the outer surface of the inner sleeve, and the bearing bush assembly is arranged outside the inner sleeve in a sleeving mode and movably connected with the inner sleeve. A plurality of first grooves matched with the protrusions are formed in the inner surface of the outer sleeve, the bearing bush assembly is sleeved with the outer sleeve, and one end of the outer sleeve is connected with the valve body. The sealing structure can ensure the sealing reliability of the valve body and the rotating shaft.

Description

Technical Field

[0001] This utility model relates to the field of roasting furnace technology, and in particular to an ash discharge valve. Background Technology

[0002] The flue gas from the main flue of the first-stage furnace in the roasting plant is collected by primary and secondary cyclone dust collectors into a large ash hopper, from which it is then discharged to the second-stage furnace for secondary roasting. A high-temperature resistant rotary valve is installed between the large ash hopper and the second-stage furnace to ensure uniform feeding to the second-stage furnace, while simultaneously isolating it from backflow of water vapor, elemental sulfur, and other substances, preventing caking in the cyclone feed pipe.

[0003] Using general high-temperature resistant soft sealing materials simply cannot meet the requirements. First, it cannot seal the internal air pressure of the valve body, and given the excellent fluidity of mineral dust, it is easy to cause large-scale leakage. Second, since the second-stage furnace is operating normally, if the second-stage furnace is stopped for maintenance of the ash discharge valve, the temperature at the valve body and shaft reaches 300℃, making it impossible for maintenance personnel to replace the sealing material.

[0004] Utility model patent CN201945188U discloses a high-temperature ash discharge valve, including a housing with an inlet at the top and an outlet at the bottom. Its key feature is a rotor with rotating blades inside the housing, passing through the housing. One end of the rotor is connected to a drive shaft, and one end of an end cap is fixedly connected to the housing. The other end of the end cap is a circular tube tightly connected to the rotor via a sleeve, with holes in both the tube and the sleeve. However, material inside the high-temperature ash discharge valve is prone to leakage from the connection between the rotor and the housing. Utility Model Content

[0005] The purpose of this invention is to provide an ash discharge valve that can ensure the reliability of the seal between the valve body and the rotating shaft, thereby addressing the deficiencies in the prior art.

[0006] To achieve the above objectives, this utility model provides an ash discharge valve, including a valve body and a rotating shaft with rotating blades, wherein the rotating shaft is disposed within the valve body and the end of the rotating shaft passes through the valve body;

[0007] A sealing assembly is provided on the rotating shaft located outside the valve body. The sealing assembly is close to the connection between the valve body and the rotating shaft. The sealing assembly includes an inner sleeve, a bearing assembly, and an outer sleeve. The inner sleeve is fitted onto the rotating shaft and has several protrusions on its outer surface. The bearing assembly is fitted onto the inner sleeve and is movably connected to the inner sleeve. Its inner surface has several first grooves that match the protrusions. The outer sleeve is fitted onto the bearing assembly, and one end of the outer sleeve is connected to the valve body.

[0008] The valve body is equipped with a rotating shaft with rotating blades. The upper part of the valve body has a feed port and the lower part has a discharge port. During operation, high-temperature materials enter the valve body through the feed port and fall between the rotating blades. The materials enter the discharge port as the rotating shaft rotates.

[0009] To ensure reliable sealing between the valve body and the rotating shaft, this invention includes a sealing assembly on the rotating shaft outside the valve body. The sealing assembly comprises an inner sleeve, a bearing assembly, and an outer sleeve. The inner sleeve is fitted onto the rotating shaft and rotates with it. The bearing assembly is fitted outside the inner sleeve. A protrusion on the inner sleeve engages with a first groove on the bearing assembly to form a toothed dust-locking device, ensuring that mineral dust and toxic gases are difficult to leak from the connection between the valve body and the rotating shaft. The outer sleeve ensures that the bearing assembly is fitted outside the inner sleeve.

[0010] Optionally, the rotating shaft is provided with a limiting member, which is disposed adjacent to the inner sleeve.

[0011] Optionally, the bearing assembly consists of a first bearing and a second bearing, both of which have semi-circular cross-sections, and both of which have several grooves on their inner surfaces that match the protrusions.

[0012] The first bearing and the second bearing form a circular bearing, and are held in position by an outer sleeve fitted over both of them, so that the first bearing and the second bearing are held between the inner sleeve and the outer sleeve.

[0013] Optionally, the valve body is provided with end caps at both ends, and one end of the outer sleeve is fixed to the end cap.

[0014] The valve body has openings at both ends, with connecting flanges at these openings. End caps are bolted to the connecting flanges to seal the valve body openings. The end caps have through holes for the rotating shaft to pass through. Inner sleeves are positioned near these through holes, and the inner sleeves cooperate with the bearing assembly to prevent leakage of mineral dust and toxic gases from the gap between the rotating shaft and the openings. Outer sleeves are fitted over the bearing assembly, with one end fixed to the end caps using hexagonal socket head cap bolts.

[0015] Optionally, a bracket is provided on the valve body, and the two ends of the rotating shaft are rotatably connected to the bracket.

[0016] The brackets at both ends of the valve body are fixed to the end caps, and the brackets are used to support the rotating shaft.

[0017] Optionally, the bracket is provided with bearing assemblies, and both ends of the rotating shaft are rotatably connected to the bracket via the bearing assemblies. The bearing assemblies are used to maintain the concentricity of the rotating shaft and reduce friction between the rotating shaft and the bracket.

[0018] Optionally, the bearing assembly includes a first bearing and a second bearing, one end of the rotating shaft passes through the second bearing, and a drive wheel is provided at the end of the rotating shaft passing through the second bearing.

[0019] Optionally, both the first bearing and the second bearing are high-temperature resistant bearings.

[0020] The use of high-temperature resistant bearings solves the problem of rapid wear of the bearing assembly, thus ensuring the operational accuracy of the entire equipment.

[0021] Beneficial effects:

[0022] The valve body of this utility model is equipped with a rotating shaft with rotating blades. The upper part of the valve body is provided with a feed port and the lower part is provided with a discharge port. During operation, high-temperature materials enter the valve body through the feed port and fall between the rotating blades. The materials enter the discharge port as the rotating shaft rotates.

[0023] To ensure reliable sealing between the valve body and the rotating shaft, this invention includes a sealing assembly on the rotating shaft outside the valve body. The sealing assembly comprises an inner sleeve, a bearing assembly, and an outer sleeve. The inner sleeve is fitted onto the rotating shaft and rotates with it. The bearing assembly is fitted outside the inner sleeve. A protrusion on the inner sleeve engages with a first groove on the bearing assembly to form a toothed dust-locking device, ensuring that mineral dust and toxic gases are difficult to leak from the connection between the valve body and the rotating shaft. The outer sleeve ensures that the bearing assembly is fitted outside the inner sleeve. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of an ash discharge valve disclosed in this utility model;

[0026] Figure 2 This is a cross-sectional view of a sealing assembly in an ash discharge valve disclosed in this utility model;

[0027] Figure 3 This is a side view of an ash discharge valve disclosed in this utility model;

[0028] Figure 4 This is a cross-sectional view of the inner sleeve of an ash discharge valve disclosed in this utility model;

[0029] Figure 5 This is a structural diagram of the inner sleeve in an ash discharge valve disclosed in this utility model;

[0030] Figure 6 This is a cross-sectional view of a bearing assembly in an ash discharge valve disclosed in this utility model;

[0031] Figure 7 This is a structural diagram of a bearing assembly in an ash discharge valve disclosed in this utility model;

[0032] Figure 8 This is a cross-sectional view of the outer casing of an ash discharge valve disclosed in this utility model;

[0033] Figure 9 This is a structural diagram of the outer casing of an ash discharge valve disclosed in this utility model;

[0034] Figure 10 This is a cross-sectional view of the first bearing assembly in an ash discharge valve disclosed in this utility model;

[0035] Figure 11 This is a cross-sectional view of the second bearing assembly in an ash discharge valve disclosed in this utility model;

[0036] Figure 12 This is a cross-sectional view of the inner sleeve of an ash discharge valve disclosed in this utility model;

[0037] Figure 13 This is a cross-sectional view of the valve body in an ash discharge valve disclosed in this utility model;

[0038] Figure 14 This is a side view of the valve body in an ash discharge valve disclosed in this utility model;

[0039] Figure 15 This is a structural diagram of the rotating shaft in an ash discharge valve disclosed in this utility model;

[0040] Figure 16 for Figure 15 Cross-sectional view of the shaft at point AA.

[0041] Reference numerals: 1 Valve body; 11 End cap; 12 Reinforcing rib; 13 Connecting flange; 14 Inlet; 15 Outlet; 2 Rotating shaft; 21 Limiting element; 22 Drive wheel; 24 Shaft end pressure plate; 25 Rotating blade; 26 Second groove; 3 Bracket; 31 First bearing; 32 First bearing bush; 33 First bearing cover; 34 Graphite packing; 35 First sealing cover; 36 Second bearing; 37 Second bearing bush; 38 Second bearing cover; 39 Second sealing cover; 4 Sealing assembly; 41 Inner sleeve; 411 Protrusion; 42 Bearing assembly; 421 First bearing shell; 422 Second bearing shell; 423 First groove; 43 Outer sleeve; 44 Round pin hole.

[0042] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0045] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] See Figure 1-16 According to an embodiment of the present utility model, an ash discharge valve includes a valve body 1 and a rotating shaft 2, wherein the rotating shaft 2 is disposed inside the valve body 1 and the end of the rotating shaft 2 passes through the valve body 1;

[0047] A sealing assembly 4 is provided on the rotating shaft 2 located outside the valve body 1. The sealing assembly 4 is close to the connection between the valve body 1 and the rotating shaft 2. The sealing assembly 4 includes an inner sleeve 41, a bearing assembly 42, and an outer sleeve 43. The inner sleeve 41 is fitted onto the rotating shaft 2, and its outer surface is provided with a plurality of protrusions 411. The bearing assembly 42 is fitted onto the inner sleeve 41 and is movably connected to the inner sleeve 41. Its inner surface is provided with a plurality of first grooves 423 that match the protrusions 411. The outer sleeve 43 is fitted onto the bearing assembly 42, and one end of the outer sleeve 43 is connected to the valve body 1.

[0048] Specifically, the valve body 1 is equipped with a rotating shaft 2 with rotating blades 25. The upper part of the valve body 1 is provided with a feed inlet 14 and the lower part is provided with a discharge outlet 15. During operation, high-temperature materials enter the valve body 1 through the feed inlet 14 and fall between the rotating blades 25. The materials enter the discharge outlet 15 as the rotating shaft 2 rotates.

[0049] The valve body 1 is sealed at both ends with end caps 11. To ensure the reliability of the seal between the valve body 1 and the rotating shaft 2, a sealing assembly 4 is provided on the rotating shaft 2 outside the valve body 1. The sealing assembly 4 includes an inner sleeve 41, a bearing assembly 42, and an outer sleeve 43. The inner sleeve 41 is fitted onto the rotating shaft 2 and rotates with it. The bearing assembly 42 is fitted outside the inner sleeve 41. The protrusion 411 on the inner sleeve 41 and the first groove 423 on the bearing assembly 42 form a toothed dust-locking device to ensure that mineral dust and toxic and harmful gases are difficult to leak from the connection between the valve body 1 and the rotating shaft 2. The outer sleeve 43 is used to ensure that the bearing assembly 42 is fitted outside the inner sleeve 41. A round pin hole 44 is provided between the bearing assembly 42 and the outer sleeve 43. A round pin is inserted into the round pin hole 44 to prevent the bearing assembly 42 from rotating under the drive of the inner sleeve 41.

[0050] A gap of 0.8-1mm should be maintained between the rotating blade 25 and the valve body 1 to ensure that the rotating blade 25 can rotate and feed material evenly. A keyway is used between the inner sleeve 41 and the rotating shaft 2 to prevent the inner sleeve 41 from not rotating due to the rotation of the rotating shaft 2. Lubricating oil is injected between the inner sleeve 41 and the bearing assembly 42 to reduce the wear of the bearing assembly 42. The axial and radial clearances on one side of the inner sleeve 41 and the bearing assembly 42 should be 0.5-0.7mm. A reinforcing rib 12 is also provided on the outside of the valve body 1 to increase its strength.

[0051] See Figure 1 In some embodiments of this utility model, the rotating shaft 2 is provided with a limiting member 21, which is located adjacent to the inner sleeve 41.

[0052] To prevent excessive clearance caused by long-term friction between the inner sleeve 41 and the bearing assembly 42, a limiting member 21 is provided on the rotating shaft 2 to limit the position of the inner sleeve 41. The limiting member 21 is a round nut to ensure the sealing effect of the toothed dust-locking device formed by the inner sleeve 41 and the bearing assembly 42.

[0053] See Figure 6 and 7 In some embodiments of this utility model, the bearing assembly 42 is composed of a first bearing 421 and a second bearing 422. The cross-section of the first bearing 421 and the second bearing 422 is semi-circular, and the inner surfaces of the first bearing 421 and the second bearing 422 are provided with a plurality of grooves that match the protrusion 411.

[0054] In this embodiment, the first bearing shell 421 and the second bearing shell 422 form a circular bearing shell, and are held in position by an outer sleeve 43 fitted over both of them, so that the first bearing shell 421 and the second bearing shell 422 are held between the inner sleeve 41 and the outer sleeve 43.

[0055] See Figure 1In some embodiments of this utility model, the valve body 1 is provided with end caps 11 at both ends, and one end of the outer sleeve 43 is fixed on the end caps 11.

[0056] In this embodiment, the valve body 1 has openings at both ends, with connecting flanges 13 at the openings. The end cap 11 is connected to the connecting flanges 13 by bolts, thereby sealing the openings of the valve body 1. The end cap 11 has through holes for the rotating shaft 2 to pass through. Inner sleeves 41 are respectively positioned near the through holes of the rotating shaft 2. The inner sleeves 41 and the bearing assembly 42 cooperate to prevent leakage of mineral dust and toxic and harmful gases from the gap between the rotating shaft 2 and the opening. The outer sleeve 43 is fitted over the bearing assembly 42, and one end of it is fixed to the end cap 11 by an internal hex bolt.

[0057] See Figure 1 In some embodiments of this utility model, a bracket 3 is provided on the valve body 1, and the two ends of the rotating shaft 2 are rotatably connected to the bracket 3 respectively.

[0058] In this embodiment, the brackets 3 at both ends of the valve body 1 are fixed on the end cap 11, and the brackets 3 are used to support the rotating shaft 2.

[0059] See Figure 1 , 10 In some embodiments of this utility model, the bracket 3 is provided with a bearing assembly, and both ends of the rotating shaft 2 are rotatably connected to the bracket 3 through the bearing assembly. The bearing assembly is located in the middle of the bracket 3, and both ends of the rotating shaft 2 are connected to the bearing assembly. The bearing assembly is used to maintain the concentricity of the rotating shaft 2 and reduce the friction between the rotating shaft 2 and the bracket 3.

[0060] See Figure 1 , 10 In some embodiments of the present invention, the bearing assembly includes a first bearing 31 and a second bearing 36, one end of the rotating shaft 2 passes through the second bearing 36, and a transmission wheel 22 is provided at the end of the rotating shaft 2 passing through the second bearing 36.

[0061] In this embodiment, the first bearing 31 and the second bearing 36 are respectively mounted on the brackets 3 at both ends of the valve body 1. The transmission wheel 22 is a sprocket sleeved on the rotating shaft 2, which is connected to the drive device through a chain to drive the rotation of the rotating shaft 2.

[0062] The bearing assembly includes a first bearing assembly and a second bearing assembly. The first bearing assembly includes a first bearing 31, a first bearing bushing 32, a first bearing cap 33, a graphite packing 34, and a first sealing cap 35, all mounted on one of the brackets 3. The rotating shaft 2 has two second grooves 26 for housing a retaining ring, located adjacent to the first bearing 31 and the second bearing 36 respectively, to restrict the axial movement of the rotating shaft 2.

[0063] The first bearing bushing 32 and the first bearing cover 33 are connected to the bracket 3 by bolts. A space for placing the first bearing 31 is provided between the first bearing bushing 32 and the first bearing cover 33. The rotating shaft 2 passes through the first bearing cover 33 and is connected to the first bearing 31. The first sealing cover 35 is connected to the side of the first bearing cover 33 away from the first bearing bushing 32 and is used to seal the gap between the first bearing cover 33 and the rotating shaft 2. A graphite packing 34 is also provided between the first sealing cover 35 and the first bearing cover 33. Both the first sealing cover 35 and the graphite packing 34 are used for dustproof sealing of the first bearing 31.

[0064] The second bearing assembly includes a second bearing 36, a second bearing bushing 37, a second bearing cap 38, and a second sealing cap 39, all mounted on another bracket 3.

[0065] The second bearing bushing 37 and the second bearing cover 38 are connected to the bracket 3 by bolts. There is a space between the second bearing bushing 37 and the second bearing cover 38 for placing the second bearing 36. The rotating shaft 2 passes through the second bearing cover 38 and is connected to the second bearing 36.

[0066] One end of the rotating shaft 2 passes through the second bearing 36, and a transmission wheel 22 is provided at the end of the rotating shaft 2 that passes through the second bearing 36. A shaft end pressure plate 24 is provided at the end of the rotating shaft 2.

[0067] The second sealing cap 39 is disposed on the side of the second bearing bush 37 away from the second bearing cap 38, and on the side of the second bearing cap 38 away from the second bearing bush 37. It is used to seal the gap between the second bearing cap 38 and the rotating shaft 2, and between the second bearing bush 37 and the rotating shaft 2. Graphite packing 34 may also be disposed between the second sealing cap 39 and the second bearing bush 37, and between the second sealing cap 39 and the second bearing cap 38. Both the second sealing cap 39 and the graphite packing 34 are used for dustproof sealing of the second bearing 36.

[0068] See Figure 1 , 10 In some embodiments of this utility model, the first bearing 31 and the second bearing 36 are both high-temperature bearings.

[0069] Using high-temperature bearings solves the problem of rapid wear of the bearing assembly 42, thus ensuring the operational accuracy of the entire equipment. Since the temperature of the rotating shaft 2 outside the valve body 1 reaches 215℃, ordinary high-temperature lubricating oil (molybdenum disulfide) is essentially ineffective for lubrication if a sliding bearing is used. Firstly, the lubricating oil between the bearing assembly 42 and the inner sleeve 41 quickly becomes thinner at this temperature and flows away from the bearing assembly 42. Secondly, the environment in which the bearing assembly 42 is located is not ideal, with mineral dust in the air, causing severe wear on the bearing assembly 42. Generally, after two to three months of use, the concentricity of the rotating shaft 2 becomes extremely poor, and the accuracy is significantly reduced, making it very difficult to reopen the ash discharge valve after it has stopped. Furthermore, it leads to excessively large mechanical seal clearance between the bearing assembly 42 and the inner sleeve 41, causing seal failure.

[0070] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An ash discharge valve, characterized in that, It includes a valve body and a rotating shaft with rotating blades, the rotating shaft being disposed within the valve body, and the end of the rotating shaft passing through the valve body; A sealing assembly is provided on the rotating shaft located outside the valve body. The sealing assembly is close to the connection between the valve body and the rotating shaft. The sealing assembly includes an inner sleeve, a bearing assembly, and an outer sleeve. The inner sleeve is fitted onto the rotating shaft and has several protrusions on its outer surface. The bearing assembly is fitted onto the inner sleeve and is movably connected to the inner sleeve. Its inner surface has several first grooves that match the protrusions. The outer sleeve is fitted onto the bearing assembly, and one end of the outer sleeve is connected to the valve body.

2. The ash discharge valve according to claim 1, characterized in that, The rotating shaft is provided with a limiting member, which is located adjacent to the inner sleeve.

3. The ash discharge valve according to claim 1, characterized in that, The bearing assembly consists of a first bearing and a second bearing. The cross-section of the first bearing and the second bearing is semi-circular, and the inner surface of the first bearing and the second bearing is provided with several grooves that match the protrusion.

4. The ash discharge valve according to claim 1, characterized in that, The valve body is provided with end caps at both ends, and one end of the outer sleeve is fixed to the end cap.

5. The ash discharge valve according to any one of claims 1-4, characterized in that, The valve body is provided with a bracket, and the two ends of the rotating shaft are respectively rotatably connected to the bracket.

6. The ash discharge valve according to claim 5, characterized in that, The bracket is equipped with bearing assemblies, and the two ends of the rotating shaft are rotatably connected to the bracket through the bearing assemblies.

7. The ash discharge valve according to claim 6, characterized in that, The bearing assembly includes a first bearing and a second bearing, one end of the rotating shaft passes through the second bearing, and a transmission wheel is provided at the end of the rotating shaft that passes through the second bearing.

8. The ash discharge valve according to claim 7, characterized in that, Both the first bearing and the second bearing are high-temperature resistant bearings.

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