Combined type fan shaft end sealing device

Abstract

The utility model relates to a combined type fan shaft end sealing device, which belongs to the field of XX and comprises a mounting seat, a sealing box and a filler adjusting gland. The mounting seat is welded on the fan volute; the sealing box is connected to the left end of the mounting seat; the filler adjusting gland is connected to the left end of the sealing box in a sealed mode. The sealing box is provided with a gas sealing cavity and a filler sealing cavity; the gas sealing cavity is connected with a compressed air supply pipe; the utility model not only can improve the axial sealing effect of the fan, reduce the overflow of the conveying medium, optimize the post environment and reduce the occupational health hazard and the personal safety risk, but also has the characteristics of simple structure, convenience in operation, installation and maintenance and low running cost.

Description

Technical Field

[0001] The utility model belongs to the field of fan shaft end seals, and specifically relates to a composite fan shaft end seal device. Background Technique

[0002] Fans are mechanical equipment used for gas compression and gas transportation, and are widely used in fields such as metallurgy, petrochemical, electric power, urban rail transit, textile, shipbuilding, etc. and for ventilation and air change in various places. In the pyrometallurgical industry of metals such as lead and zinc, fans are even more crucial, important, and essential equipment. Fans are required for the gas medium supply, flue gas collection and treatment, and environmental governance systems of metallurgical furnaces, and are commonly used for the transportation of flammable, explosive, toxic, and harmful gases. The shaft end seal performance of a fan is an important indicator to measure the operation reliability of the fan. Especially in the transportation of toxic, harmful, flammable, and explosive media, higher and stricter requirements are put forward for the shaft end seal performance of the fan. If the shaft end seal performance of the fan is not good, it is easy to cause the overflow of the transported medium, which not only causes environmental pollution, but also brings great occupational health hazards and personal safety risks to personnel.

[0003] There are many types of fan shaft end seals. Currently, commonly used ones include packing seals, labyrinth seals, carbon ring seals, mechanical seals, etc. Each has its own advantages and disadvantages. However, considering aspects such as sealing effect and operating cost, they are all not ideal and more or less have some deficiencies: Packing seals have poor sealing effect, large power loss of the equipment, and frequent maintenance and replacement; Labyrinth seals have large leakage, high operating cost, narrow application range, and are only applicable to the use of non-toxic, harmless, and non-dangerous media; Carbon ring seals have high requirements for material properties and machining accuracy, are relatively sensitive to the radial vibration of the equipment, have a short service life, frequent packing replacement, high manufacturing and maintenance costs, and also have high operating conditions requirements, and are only applicable to clean medium conditions with a vibration amplitude less than 0.5 mm; Mechanical seals have a complex structure, high manufacturing cost, inconvenient installation, and high requirements for the operating accuracy and stability performance of the equipment. Summary of the Invention

[0004] In order to overcome the problems existing in the background technique, the utility model provides a composite fan shaft end seal device, which can not only improve the axial sealing effect of the fan, reduce the overflow of the transported medium, optimize the post environment, and reduce occupational health hazards and personal safety risks, but also has the characteristics of simple structure, convenient operation, convenient installation and maintenance, and low operating cost.

[0005] To achieve the above object, the utility model is realized by the following technical solutions:

[0006] The described composite fan shaft end sealing device includes a mounting seat, a sealing box and a packing adjusting gland; the mounting seat is welded on the fan volute; the sealing box is connected to the left end of the mounting seat; the packing adjusting gland is hermetically connected to the left end of the sealing box; the sealing box is provided with a gas sealing cavity and a packing sealing cavity; the gas sealing cavity is connected with a compressed air supply pipe.

[0007] Preferably, both the sealing box and the packing adjusting gland are in a cylindrical structure divided into two halves; the sealing box includes a sealing cylinder and a connecting ring plate, the connecting ring plate is connected to the right end of the sealing cylinder, and bolt holes for connecting with the mounting seat are provided on the connecting ring plate; countersunk bolt holes are provided on the left end face of the sealing cylinder; the packing adjusting gland includes a flange plate and an inserting pipe; the inserting pipe is inserted into the sealing box from the left end, and the flange plate of the packing adjusting gland and the countersunk bolt holes of the sealing box are bolted together.

[0008] Preferably, the two half structures of the sealing box and the packing adjusting gland are connected in an adjustable tightness manner through connecting wing plates provided with bolt holes.

[0009] Preferably, the mounting seat is in a flange plate structure divided into two halves, and the connecting ring plate is bolted to the mounting seat.

[0010] Preferably, the inner wall of the sealing cylinder is respectively provided with a retaining ring A and a retaining ring B with the same inner diameter. The retaining ring A is arranged at the left end of the sealing box, and a gas sealing cavity is formed between the retaining ring A and the retaining ring B; a packing sealing cavity is formed between the inserting pipe and the retaining ring B; sealing packing is arranged in the packing sealing cavity.

[0011] Preferably, the sealing packing is wool felt or packing.

[0012] Preferably, two opposite threaded holes communicating with the inside of the cavity are provided on the gas sealing cavity, and quick-connect air source connectors are installed on the threaded holes. The quick-connect air source connectors are connected with the compressed air supply pipe.

[0013] Preferably, the gas sealing cavity is provided with a threaded hole communicating with the inside of the cavity and blocked by a plug.

[0014] Preferably, the compressed air supply pipe is equipped with an FRL pneumatic triple unit and a control valve for adjusting the air source pressure and filtering the water, gasoline and mist of the air source.

[0015] The beneficial effects of the present utility model:

[0016] The present utility model can not only improve the axial sealing effect of the fan, reduce the overflow of the conveyed medium, optimize the working environment, reduce the occupational health hazards and personal safety risks, but also has the characteristics of simple structure, convenient operation, convenient installation and maintenance, and low operation cost. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the mounting base of the present utility model;

[0019] Figure 3 is the structural schematic diagram of the seal box of the present utility model;

[0020] Figure 4 is the internal structural schematic diagram of the seal box of the present utility model;

[0021] Figure 5 is the structural schematic diagram of the packing adjusting gland of the present utility model;

[0022] Figure 6 is the mounting structural schematic diagram of the present utility model;

[0023] In the drawings, 1 - mounting base; 2 - seal box; 21 - quick - connect gas source joint; 22 - threaded hole plugged with a plug; 23 - gas sealing cavity; 24 - packing sealing cavity; 25 - countersunk bolt hole; 26 - connecting ring plate; 27 - sealing cylinder; 28 - retaining ring A; 29 - retaining ring B; 3 - packing adjusting gland; 4 - connecting wing plate; 5 - bolt, 6 - bolt hole, 7 - packing. Specific embodiments

[0024] In order to make the purpose, technical solutions and beneficial effects of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below in conjunction with the drawings for the convenience of those skilled in the art to understand.

[0025] In the description of the present utility model, unless otherwise specified, the orientation or positional relationship indicated by terms such as "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "provided with" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] This embodiment is described by taking its use on the smoke exhaust fan of a metallurgical furnace kiln as an example. As Figure 1-6As shown in the figure, the composite fan shaft end sealing device includes a mounting seat 1, a sealing box 2 and a packing adjusting gland 3.

[0028] The mounting seat 1 is a split flange structure, and both the sealing box 2 and the packing adjusting gland 3 are split cylindrical structures. The split structures of the mounting seat 1, the sealing box 2 and the packing adjusting gland 3 are very convenient for installation and maintenance, and installation and maintenance can be carried out without disassembling parts such as the fan bearing and end cover.

[0029] The sealing box 2 includes a sealing cylinder 27 and a connecting ring plate 26. The connecting ring plate 26 is connected to the right end of the sealing cylinder 27. A countersunk bolt hole 25 is provided on the left end face of the sealing cylinder 27, and a bolt hole 6 is provided on the connecting ring plate 26. The connecting ring plate 26 is bolted to the mounting seat 1 through this bolt hole. The packing adjusting gland 3 includes a flange and an insertion tube; the insertion tube is inserted into the sealing box 2 from the left end, and the flange of the packing adjusting gland 3 is bolted to the countersunk bolt hole 25 of the sealing box 2. On the inner wall of the sealing cylinder 27, there are respectively a retaining ring A 28 and a retaining ring B 29 with the same inner diameter. The retaining ring A 28 is arranged at the left end of the sealing box 2, and a gas sealing cavity 23 is formed between the retaining ring A 28 and the retaining ring B 29; a packing sealing cavity 24 is formed between the insertion tube of the packing adjusting gland 3 and the retaining ring B 29; a sealing packing 7 is provided in the packing sealing cavity 24, and the packing is packing or felt. The gas sealing cavity 23 and the packing sealing cavity 24 form two seals, which have a better sealing effect. The connection method between the flange of the packing adjusting gland 3 and the sealing cylinder 27 can adjust the pressing condition of the packing 7 in the packing sealing cavity 24 by tightening or loosening the connection bolts between the two.

[0030] Two opposite threaded holes communicating with the inside of the cavity are provided in the gas sealing cavity 23, and a quick-insert gas source joint 21 is installed on the threaded holes. The quick-insert gas source joint 21 is connected to a compressed air supply pipe. The compressed air supply pipe is equipped with an FRL pneumatic triple unit for adjusting the gas source pressure and filtering the water, gasoline and mist of the gas source and a control valve. Compressed air is introduced into the gas sealing cavity 23 through the compressed air supply pipe for gas sealing.

[0031] The gas sealing cavity 23 is also provided with a threaded hole 22 communicating with the inside of the cavity and blocked by a plug. When there is liquid or dust accumulation in the gas sealing cavity 23, the plug in the threaded hole 22 blocked by the plug is screwed out and blown with compressed air.

[0032] Sealing gaskets are provided on the contact surfaces between the mounting seat 1, the sealing box 2 and the packing adjusting gland 3.

[0033] Demonstration of the application example of the present utility model:

[0034] The two halves of the mounting base 1 are closed and welded to the ID fan volute of the Isa furnace; the right end of the sealing box 2 is installed and fixed to the left end of the mounting base 1 using bolts 5, and then the upper and lower halves of the sealing box are closed and fixed using bolts 5 at the connecting wing plate 4 of the sealing box 2; a PU air pipe is connected to the quick-insert air source joint 21 of the sealing box 2, and the compressed air filtered and regulated by the FRL pneumatic triple unit is introduced into the gas sealing cavity 23 of the sealing box 2 for gas sealing; wool felt is filled in the packing sealing cavity 24 as the packing seal for the second seal; the packing adjusting gland 3 is installed on the left side of the sealing box 2, and the upper and lower halves are closed and fixed using hexagon socket head cap screws at the connecting wing plate 4 of the packing adjusting gland 3, and the compression or relaxation of the wool felt sealing packing in the packing sealing cavity 24 is achieved by tightening or loosening the connecting bolts between the packing adjusting gland 3 and the sealing cylinder 27.

[0035] When it is necessary to clean the accumulated liquid or dust in the sealing cavity of the sealing box 2, the plug installed in the threaded hole 22 blocked by the plug is screwed out, and compressed air is used for blowing and washing; the water vapor and oil mist in the filtered air source are filtered by the FRL pneumatic triple unit, and the air source pressure is adjusted, and the air source flow rate is adjusted using the control valve.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A composite fan shaft end sealing device, characterized in that: It includes a mounting seat, a sealing box and a stuffing regulating gland; the mounting seat is welded on the fan volute; the sealing box is connected to the left end of the mounting seat; the stuffing regulating gland is sealed and connected to the left end of the sealing box; the sealing box is provided with a gas sealing chamber and a stuffing sealing chamber; the gas sealing chamber is connected to a compressed air supply pipe.

2. The composite fan shaft end sealing device according to claim 1, characterized in that: The sealing box and the packing regulating gland are both cylindrical structures divided into two lobes; the sealing box includes a sealing cylinder and a connecting ring plate, the connecting ring plate is connected to the right end of the sealing cylinder, and a bolt hole for connecting to the mounting seat is provided on the connecting ring plate; a countersunk bolt hole is provided on the left end face of the sealing cylinder; the packing regulating gland includes a flange and an insert; the insert is inserted into the sealing box from the left end, and the flange of the packing regulating gland and the countersunk bolt hole of the sealing box are bolted together.

3. The composite fan shaft end sealing device according to claim 2, characterized in that: The two-flap structures of the sealing box and the packing regulating gland are connected in an adjustable tightness through a connecting wing plate provided with bolt holes.

4. The composite fan shaft end sealing device according to claim 2, characterized in that: The mounting seat is a flange structure divided into two pieces, and the connecting ring plate is bolted to the mounting seat.

5. The composite fan shaft end sealing device according to claim 2, characterized in that: The inner wall of the sealing cylinder is respectively provided with a baffle ring A and a baffle ring B with the same inner diameter. The baffle ring A is arranged at the left end of the sealing box, and a gas sealing cavity is formed between the baffle ring A and the baffle ring B; a packing sealing cavity is formed between the socket pipe and the baffle ring B; and a sealing packing is arranged in the packing sealing cavity.

6. The composite fan shaft end sealing device according to claim 5, characterized in that: The sealing filler is wool felt or packing.

7. The composite fan shaft end sealing device according to claim 1, characterized in that: The gas sealing cavity is provided with two threaded holes which are opposite to each other and communicated with the interior of the cavity. The threaded holes are provided with quick-insert gas source connectors which are connected with the compressed air supply pipe.

8. The composite fan shaft end sealing device according to claim 1, characterized in that: The gas sealing cavity is provided with a threaded hole which is communicated with the interior of the cavity and is blocked by a plug.

9. The composite fan shaft end sealing device according to any one of claims 1 to 8, characterized in that: The compressed air supply pipe is equipped with an FRL pneumatic triplet and a control valve for adjusting the air source pressure and filtering the water and gasoline mist of the air source.

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