Sealing structure for feeding end of furnace core tube

Abstract

The utility model discloses a sealing structure for a feeding end of a furnace core tube. A sealing assembly further comprises an annular convex groove body and a plurality of first gas input nozzles. An annular isolation gap is defined by the annular connecting plate, the annular boss and the feeding pipe; the annular convex groove body surrounds and protrudes out of the mounting plate, and a groove opening of the annular convex groove body penetrates through the mounting plate and is communicated with the annular gap; the multiple first gas input nozzles are arranged on the peripheral face of the annular convex groove body at intervals, the output ends of the first gas input nozzles communicate with the annular gap through an inner cavity of the annular convex groove body, and the input ends of the first gas input nozzles are used for inputting sealing gas and maintaining pressure. The annular isolation gap can reduce the temperature rise influence of the heat of the feeding pipe on the annular boss; the first gas input nozzle inputs sealing gas into the inner cavity of the annular convex groove body and the annular gap, an annular gas sealing ring can be formed, and the sealing effect of the annular gap is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of the core tube of a rotary kiln, in particular to a sealing structure for the feeding end of the core tube. Background Art

[0002] The existing rotary kiln includes a feeding sealing cover, a core tube and a screw feeder. The middle of the feeding sealing cover is provided with a feeding port. One end of the core tube close to the feeding sealing cover is the feeding end. A feeding pipe is installed at the feeding end of the core tube. The screw feeder sequentially passes through the feeding port and the feeding pipe to convey the material to be fired to the core tube. The end of the feeding pipe abuts against the end face of the adjacent feeding sealing cover. The feeding pipe rotates together with the core tube, so that the material to be fired tumbles in the core tube, thereby improving the uniformity of the temperature distribution during the firing of the material.

[0003] In the prior art, a sealing material such as packing is used to seal the gap between the end of the feeding pipe and the end face of the feeding sealing cover. During the operation of the rotary kiln, heat continuously flows out from this gap and heats the sealing material, making the sealing material prone to aging due to heat and leakage. Therefore, the sealing material often needs to be replaced, and when replacing the sealing material, the rotary kiln needs to stop running, reducing the production efficiency of the rotary kiln. Summary of the Utility Model

[0004] Aiming at the above deficiencies, the purpose of the present utility model is to provide a sealing structure for the feeding end of the core tube, which solves the problem that the sealing material is prone to aging due to heat and leakage.

[0005] To achieve this purpose, the present utility model adopts the following technical solutions:

[0006] A sealing structure for the feeding end of a core tube. A feeding pipe is installed at the feeding end of the core tube. A circular ring boss is fixed to the outer peripheral surface of the feeding pipe through an annular connecting plate. The circular ring boss is located at one end of the feeding pipe close to the feeding sealing cover. The feeding pipe and the circular ring boss rotate synchronously with the core tube. The sealing structure includes a sealing assembly. The sealing assembly includes a mounting plate and a plurality of packings. The annular mounting plate surrounds the outer periphery of the circular ring boss. One end of the mounting plate is fixed to the feeding sealing cover. An annular gap is left between the mounting plate and the circular ring boss. The plurality of packings are arranged at intervals along the axial direction and surround the outer peripheral surface of the circular ring boss to seal the annular gap. The sealing assembly further includes an annular convex groove body and a plurality of first gas inlet nozzles.

[0007] The annular connecting plate, the circular ring boss and the feeding pipe enclose an annular isolation gap. The isolation gap extends along the axial direction of the feeding pipe. One end of the isolation gap away from the annular connecting plate is open.

[0008] The annular convex groove body surrounds and protrudes from the mounting plate, and the notch of the annular convex groove body penetrates through the mounting plate and communicates with the annular gap; a plurality of the first gas input nozzles are arranged at intervals on the outer peripheral surface of the annular convex groove body, and the output end of the first gas input nozzle communicates with the annular gap through the inner cavity of the annular convex groove body, and the input end of the first gas input nozzle is used for inputting sealing gas and maintaining pressure.

[0009] Furthermore, the sealing assembly further includes a plurality of lubricating oil input nozzles;

[0010] A plurality of the lubricating oil input nozzles are installed at intervals on the outer peripheral surface of the mounting plate, and the lubricating oil input nozzles are used for inputting lubricating oil into the annular gap;

[0011] The plurality of lubricating oil input nozzles are divided into two groups, and the two groups of lubricating oil input nozzles are respectively located on both sides of the annular convex groove body;

[0012] There is at least one of the lubricating oil input nozzles between two adjacent packing rings.

[0013] Preferably, the annular convex groove body is arranged between two packing rings.

[0014] Furthermore, the sealing assembly further includes a plurality of second gas input nozzles;

[0015] A plurality of the second gas input nozzles are installed on the outer peripheral surface of the mounting plate close to the feed sealing cover side and input cooling gas into the annular gap.

[0016] Preferably, the sealing gas is the same as the protective gas for the feed sealing cover and the furnace core tube.

[0017] Preferably, the cooling gas is the same as the protective gas for the feed sealing cover and the furnace core tube.

[0018] Preferably, the air pressure of the sealing gas in the annular convex groove body is the same as the air pressure of the protective gas in the feed sealing cover and the furnace core tube.

[0019] Furthermore, the sealing assembly further includes a slag discharge valve;

[0020] The slag discharge valve is installed on the outer peripheral surface of the annular convex groove body.

[0021] The beneficial effects of the technical solution of a sealing structure for the feeding end of a furnace core tube proposed by the present utility model are as follows: Through the annular isolation gap, the circular ring boss is separated from the outer peripheral surface of the feeding tube, so as to reduce the influence of the heat of the feeding tube on the temperature rise of the circular ring boss, avoid the temperature rise of the packing due to heat, and thus delay the aging of the packing; and a sealing gas is input into the inner cavity of the annular convex groove body and the annular gap through the first gas input nozzle to form an annular gas sealing ring, so as to improve the sealing performance of the sealing structure for the feeding end of the furnace core tube, reduce the replacement frequency of the packing, and further improve the production efficiency of the rotary furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic structural diagram of an embodiment of a sealing structure for the feeding end of a furnace core tube of the present utility model;

[0023] Figure 2 FIG. is a cross-sectional structural diagram of an embodiment of a sealing structure for the feeding end of a furnace core tube of the present utility model;

[0024] Figure 3 is Figure 2 an enlarged view of part A in

[0025] Figure 4 is Figure 2 an enlarged view of part B in

[0026] Wherein: feeding sealing cover 1; furnace core tube 2; sealing assembly 3; cooling device 4; feeding tube 21; annular connecting plate 22; circular ring boss 23; packing 31; mounting plate 32; lubricating oil input nozzle 33; first gas input nozzle 34; slag discharge valve 35; annular convex groove body 36; second gas input nozzle 37; annular air duct 41; heat insulation pad 42; isolation gap 230; annular gap 320; air outlet nozzle 411. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will further illustrate the technical solution of the present utility model in conjunction with the attached Figures 1-4 drawings and through specific embodiments.

[0028] The drawings are only for illustrative purposes and cannot be construed as limiting the patent; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be said to be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] A sealing structure for the feeding end of a furnace core tube. A feeding tube 21 is installed at the feeding end of the furnace core tube 2. The circular ring boss 23 is fixed to the outer peripheral surface of the feeding tube 21 through an annular connecting plate 22. The circular ring boss 23 is located at one end of the feeding tube 21 close to the feeding sealing cover 1; the feeding tube 21 and the circular ring boss 23 rotate synchronously with the furnace core tube 2; the sealing structure includes a sealing assembly 3, and the sealing assembly 3 includes a mounting plate 32 and a plurality of packing rings 31; the annular mounting plate 32 surrounds the outer periphery of the circular ring boss 23, and one end of the mounting plate 32 is fixed to the feeding sealing cover 1; an annular gap 320 is left between the mounting plate 32 and the circular ring boss 23, and the plurality of packing rings 31 are arranged at intervals along the axial direction and surround the outer peripheral surface of the circular ring boss 23 to seal the annular gap 320. The sealing assembly 3 further includes an annular groove body 36 and a plurality of first gas input nozzles 34;

[0031] The annular connecting plate 22, the circular ring boss 23 and the feeding tube 21 enclose an annular isolation gap 230; the isolation gap 230 extends along the axial direction of the feeding tube 21, and one end of the isolation gap 230 far from the annular connecting plate 22 is an open end;

[0032] The annular groove body 36 surrounds and protrudes from the mounting plate 32. The notch of the annular groove body 36 passes through the mounting plate 32 and is communicated with the annular gap 320; the plurality of first gas input nozzles 34 are arranged at intervals on the outer peripheral surface of the annular groove body 36. The output end of the first gas input nozzle 34 is communicated with the annular gap 320 through the inner cavity of the annular groove body 36, and the input end of the first gas input nozzle 34 is used for inputting sealing gas and maintaining pressure.

[0033] Figure 1 It is a schematic structural diagram of an embodiment of a sealing structure for the feeding end of a furnace core tube of the present utility model, Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of the sealing structure of the present utility model, Figure 3 is Figure 2 the enlarged view of part A in

[0034] The annular connecting plate 22, the annular convex platform 23 and the feed pipe 21 enclose an annular isolation gap 230, which can make the outer peripheral surface of the annular convex platform 23 away from the feed pipe 21, and can reduce the temperature rise effect of the heat of the feed pipe 21 on the annular convex platform 23; the sealing gas input through the first gas input nozzle 34 into the inner cavity of the annular convex groove body 36 and the annular gap 320 forms an annular gas sealing ring, which can enhance the sealing performance of the annular gap 320.

[0035] Further, the sealing assembly 3 further includes a plurality of lubricating oil input nozzles 33;

[0036] The plurality of lubricating oil input nozzles 33 are spaced and installed on the outer peripheral surface of the mounting plate 32, and the lubricating oil input nozzles 33 are used to input lubricating oil into the annular gap 320;

[0037] The plurality of lubricating oil input nozzles 33 are divided into two groups, and the two groups of lubricating oil input nozzles 33 are respectively located on both sides of the annular convex groove body 36;

[0038] There is at least one lubricating oil input nozzle 33 between two adjacent packing rings 31.

[0039] As Figures 1-3 shown, there is at least one lubricating oil input nozzle 33 between two adjacent packing rings 31 to ensure that each packing ring 31 can be wetted by lubricating oil, which can reduce the frictional loss between the packing ring 31 and the rotating annular convex platform 23 and extend the service life of the packing ring 31.

[0040] Preferably, the annular convex groove body 36 is arranged between the two packing rings 31.

[0041] As Figures 1-3 shown, arranging the annular convex groove body 36 between the two packing rings 31 can utilize the sealing effect of the two packing rings 31 to reduce the leakage of the cooling gas input by the first gas input nozzle 34 and improve the pressure holding effect.

[0042] Further, the sealing assembly 3 further includes a plurality of second gas input nozzles 37;

[0043] The plurality of second gas input nozzles 37 are installed on the outer peripheral surface of the mounting plate 32 close to the feed sealing cover 1 side and input cooling gas into the annular gap 320.

[0044] As Figures 1-3 shown, by respectively inputting cooling gas into one end of the annular gap 320 close to the feed sealing cover 1 through the plurality of second gas input nozzles 37, the heat of the hot air flow leaking from the inlet pipe 21 can be blocked from entering the annular gap 320, thereby reducing the volatilization of the lubricating oil and lowering the internal temperature of the annular gap 320, and further improving the service life of the packing ring 31.

[0045] Preferably, the sealing gas is the same as the protective gas for the feed sealing cover 1 and the furnace core tube 2.

[0046] Preferably, the cooling gas is the same as the protective gas for the feed sealing cover 1 and the furnace core tube 2.

[0047] When the rotary kiln is in operation, the materials need to be fired in a protective atmosphere. Using the same gas as the protective gas used in the protective atmosphere as the sealing gas or the cooling gas can prevent the sealing gas or the cooling gas from affecting the quality of the materials fired in the rotary kiln.

[0048] Preferably, the air pressure of the sealing gas in the annular convex groove body 36 is the same as the air pressure of the protective gas in the feed sealing cover 1 and the furnace core tube 2.

[0049] Keeping the air pressure of the sealing gas the same as the air pressure of the protective gas in the feed sealing cover 1 and the furnace core tube 2 can make the two sides of the packing 31 beside the annular convex groove body 36 be evenly pressured, avoiding deformation of the packing 31 and affecting its service life.

[0050] Further, the sealing assembly 3 further includes a slag discharge valve 35;

[0051] The slag discharge valve 35 is installed on the outer peripheral surface of the annular convex groove body 36.

[0052] As Figure 1 and Figure 4 shown, by opening the slag discharge valve 35, the packing fragments and oil dirt in the annular convex groove body 36 can be removed, avoiding blockage of the first gas inlet nozzle 34 during operation.

[0053] As Figures 1-3 shown in the preferred embodiment, a cooling device 4 is further installed on the outer periphery of the feed pipe 21; the cooling device 4 includes an annular air duct 41, and the annular air duct 41 surrounds the outer periphery of the feed pipe 21; a plurality of air outlet nozzles 411 are installed at intervals on the outer peripheral surface of the annular air duct 41, and the air outlet of the air outlet nozzle 411 faces the isolation gap 230 between the circular ring boss 23 and the feed pipe 21 and sprays cooling gas.

[0054] The cooling gas sprayed by the air outlet nozzle 411 towards the isolation gap 230 can effectively reduce the temperature of the annular gap 320 and the circular ring boss 23, reduce the volatilization of the lubricating oil, lower the temperature of the packing 31, delay the wear of the packing 31, and improve the sealing effect of the sealing structure 3 and the service life of the packing 31.

[0055] In the preferred embodiment, the cooling device 4 further includes a heat insulation pad 42; the heat insulation pad 42 is used to wrap the outer peripheral surface of the feed pipe 21.

[0056] As Figures 1-3As shown, wrapping the outer circumference of the feed pipe 21 with a heat insulating pad 42 can reduce heat loss and prevent the annular air duct 41 from being heated and affecting the temperature of the output cooling gas, thereby improving the cooling effect of the cooling gas on the isolation gap 230.

[0057] The heat insulation pad 42 is glass wool or aluminum silicate insulation board. Glass wool and aluminum silicate insulation board both have good high temperature resistance and good heat insulation effect.

[0058] In summary, if Figures 1-4 In the embodiment of the utility model shown, the sealing structure for the feed end of the furnace core tube, through the annular isolation gap 230, keeps the annular boss 23 away from the outer peripheral surface of the feed pipe 21, so as to reduce the influence of the heat of the feed pipe 21 on the temperature rise of the annular boss 23, avoid the temperature rise of the packing 31 due to heat, and thus delay the aging of the packing 31; and the sealing gas input into the inner cavity of the annular convex groove body 36 and the annular gap 320 through the first gas input nozzle 34 forms an annular gas sealing ring, so as to improve the sealing performance of the sealing structure for the feed end of the furnace core tube, reduce the replacement frequency of the packing 31, and thereby improve the production efficiency of the rotary kiln.

[0059] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A sealing structure for a feed end of a furnace core tube, wherein a feed tube is installed at the feed end of the furnace core tube, and a circular boss is fixed to the outer peripheral surface of the feed tube through an annular connecting plate, and the circular boss is located at one end of the feed tube close to the feed sealing cover; the feed tube and the circular boss rotate synchronously with the furnace core tube; the sealing structure comprises a sealing assembly, and the sealing assembly comprises a mounting plate and a plurality of packings; the annular mounting plate surrounds the outer periphery of the circular boss, and one end of the mounting plate is fixed to the feed sealing cover; an annular gap is left between the mounting plate and the circular boss, and a plurality of packings are arranged at intervals along the axial direction and surround the outer peripheral surface of the circular boss and seal the annular gap, characterized in that The sealing assembly further comprises an annular convex groove body and a plurality of first gas input nozzles; The annular connecting plate, the annular boss and the feed pipe enclose an annular isolation gap; the isolation gap extends along the axial direction of the feed pipe, and one end of the isolation gap away from the annular connecting plate is open; The annular convex groove body surrounds and protrudes from the mounting plate, and the notch of the annular convex groove body passes through the mounting plate and is connected with the annular gap; a plurality of the first gas input nozzles are arranged at intervals on the outer circumferential surface of the annular convex groove body, and the output end of the first gas input nozzle is connected with the annular gap through the inner cavity of the annular convex groove body, and the input end of the first gas input nozzle is used to input sealing gas and maintain pressure.

2. The sealing structure for the feed end of the furnace core tube according to claim 1, characterized in that: The sealing assembly also includes a plurality of lubricating oil input nozzles; A plurality of lubricating oil input nozzles are installed at intervals on the outer peripheral surface of the mounting plate, and the lubricating oil input nozzles are used to input lubricating oil into the annular gap; The plurality of lubricating oil input nozzles are divided into two groups, and the two groups of lubricating oil input nozzles are respectively located on both sides of the annular convex groove body; There is at least one lubricating oil input nozzle between two adjacent packings.

3. The sealing structure for the feed end of the furnace core tube according to claim 2, characterized in that: The annular convex groove body is arranged between the two packings.

4. The sealing structure for the feed end of the furnace core tube according to claim 3, characterized in that: The sealing assembly also includes a plurality of second gas input nozzles; A plurality of the second gas input nozzles are mounted on the outer peripheral surface of the mounting plate on a side close to the feed sealing cover, and input cooling gas into the annular gap.

5. The sealing structure for the feed end of the furnace core tube according to claim 1, characterized in that: The sealing gas is the same as the protective gas used for the feed sealing hood and the furnace core tube.

6. The sealing structure for the feed end of the furnace core tube according to claim 4, characterized in that: The cooling gas is the same as the protective gas used for the feed seal hood and the furnace tube.

7. The sealing structure for the feed end of the furnace core tube according to claim 1, characterized in that: The air pressure of the sealing gas in the annular convex groove body is the same as the air pressure of the protective gas in the feed sealing cover and the furnace core tube.

8. The sealing structure for the feed end of the furnace core tube according to claim 1, characterized in that: The sealing assembly also includes a slag discharge valve; The slag discharge valve is installed on the outer peripheral surface of the annular convex groove body.

Images