CN217873408U

CN217873408U - Fan shaft seal device and draught fan

Info

Publication number: CN217873408U
Application number: CN202221559751.3U
Authority: CN
Inventors: 高志勇; 靳旺宗; 刘海峰; 王宇冬
Original assignee: Guoneng Chenjiagang Power Generation Co ltd
Current assignee: Guoneng Chenjiagang Power Generation Co ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-11-22
Anticipated expiration: 2032-06-20

Abstract

The utility model relates to a fan shaft seal device and draught fan, this fan shaft seal device includes the barrel, the first end of barrel is used for connecting on the shell of fan, so that the pivot of fan can pass the barrel, be formed with the first sealing ring piece that sets up along radial direction on the second end of barrel, first sealing ring piece is kept away from the one end of the inner tube wall of barrel is used for sealing the outer wall of shaft coupling, the inner tube wall of barrel with be provided with the balance chamber between the outer wall of shaft coupling, the balance chamber structure is for being used for balancing atmospheric pressure in the barrel and external environment's atmospheric pressure to reduce cold air intake. The fan shaft sealing device can reduce the suction amount of external cold air, avoid the problem that smoke inside the fan is adsorbed in the fan due to condensation, and avoid influencing the operating efficiency of the fan.

Description

Fan shaft seal device and draught fan

Technical Field

The disclosure relates to the technical field of fan shaft seals, in particular to a fan shaft seal device and an induced draft fan.

Background

The shaft seal of the fan is used for sealing the position of the rotating shaft so as to avoid influencing the operation of the fan.

Present shaft seal device of draught fan, at the in-service use in-process, can inhale a large amount of outside cold air because the inside negative pressure that produces of draught fan, cold air can produce the condensation and can adsorb the flue gas condensation, and the smoke and dust of condensation leads to the draught fan vibration on the blade to influence the efficiency of draught fan.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fan shaft seal device and draught fan to solve inside external cold air was inhaled a large amount to the draught fan, produce the flue gas condensation, influence the problem of draught fan efficiency.

In order to achieve the above object, an aspect of the present disclosure provides a fan shaft sealing device, which includes a cylinder, a first end of the cylinder is configured to be connected to a housing of a fan, so that a rotating shaft of the fan can pass through the cylinder, a first sealing ring is formed at a second end of the cylinder, the first sealing ring is disposed along a radial direction, one end of the first sealing ring, which is away from an inner cylinder wall of the cylinder, is configured to seal an outer wall of the rotating shaft, a balance chamber is disposed between the inner cylinder wall of the cylinder and the outer wall of the rotating shaft, and the balance chamber is configured to balance air pressure in the cylinder and air pressure in an external environment, so as to reduce a cold air suction amount.

Optionally, a second sealing ring piece arranged along the radial direction is formed on the inner cylinder wall of the cylinder body, the second sealing ring piece is located in the middle of the cylinder body, one end, far away from the inner cylinder wall of the cylinder body, of the second sealing ring piece is in sealing contact with the outer wall of the rotating shaft, and the first sealing ring piece, the second sealing ring piece, the rotating shaft and the inner cylinder wall of the cylinder body are arranged to form the balance chamber.

Optionally, a second sealing tooth is formed on one surface of the second sealing ring sheet, which is used for being in contact with the outer wall of the rotating shaft.

Optionally, a second gap is formed between the second seal tooth and the outer wall of the rotating shaft, and the width of the second gap is 0.5-1mm.

Optionally, the cylinder is provided with an air guide hole communicated with the balance chamber, and the air guide hole is used for introducing air so as to supplement air into the balance chamber.

Optionally, the fan shaft seal device further includes an air guide pipe, a first end of the air guide pipe is connected to the air guide hole, and a second end of the air guide pipe is connected to the air outlet end of the fan, so that the air generated by the fan flows into the balance chamber.

Optionally, a soft sealing ring is arranged at one end, away from the inner cylinder wall of the cylinder, of the first sealing ring piece, the soft sealing ring is used for being in sealing contact with the outer wall of the rotating shaft, and first sealing teeth are formed on one surface, in contact with the outer wall of the rotating shaft, of the soft sealing ring.

Optionally, a first gap is formed between the first seal tooth and the outer wall of the rotating shaft, and the width of the first gap is 0.5-1mm.

Optionally, a first connecting flange is formed at the first end of the cylinder, and the first connecting flange is used for connecting with the housing of the blower.

Another aspect of the present disclosure further provides an induced draft fan, which includes a motor body, an impeller, a volute, a coupler and the above fan shaft seal device;

the motor body is provided with a motor shaft, the impeller is provided with a fan shaft, the impeller is rotatably arranged in the volute, the motor shaft and the fan shaft are connected through the coupler and jointly form a rotating shaft, the first end of the cylinder is connected with the volute so that the rotating shaft penetrates through the cylinder, and the first sealing ring piece is used for sealing the outer wall of the coupler.

Above-mentioned technical scheme can realize sealing the pivot department of fan through the barrel and the first seal ring piece that set up to guarantee the suction effect of fan, realize the normal operating of fan. Atmospheric pressure and external environment's atmospheric pressure in the barrel can be balanced through the balance room that sets up, can form transition space through the balance room, the negative pressure direct action of avoiding the inside production of fan is in the gap department between first seal ring piece and pivot to reduced the intake to external cold air, the condensation can not appear in the fan inside, can avoid the inside flue gas of fan to receive the condensation and appear the problem of adsorbing in the fan, avoid influencing the operating efficiency of fan.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is a schematic structural view of a fan shaft seal device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a use state of a fan shaft seal device according to an embodiment of the present disclosure.

Description of the reference numerals

1. A barrel; 2. a first connecting flange; 3. a wind guide hole; 4. a first seal ring segment; 5. a second seal ring segment; 6. a soft sealing ring; 7. a balancing chamber; 9. a volute; 10. a fan shaft; 11. a second connecting flange; 12. a coupling; 13. a motor shaft; 14. the motor body.

Detailed Description

The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" are generally defined in the direction of the drawing plane of the drawings, and "inner and outer" refer to the inner and outer of the relevant component parts. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person of ordinary skill in the art.

As shown in fig. 1 and 2, one aspect of the present disclosure provides a fan shaft sealing device, which includes a cylinder 1, a first end of the cylinder 1 is configured to be connected to a housing of a fan, so that a rotating shaft of the fan can pass through the cylinder 1, a first sealing ring 4 is formed at a second end of the cylinder 1 and is arranged along a radial direction, one end of the first sealing ring 4, which is away from an inner cylinder wall of the cylinder 1, is configured to seal an outer wall of the rotating shaft, a balancing chamber 7 is arranged between the inner cylinder wall of the cylinder 1 and the outer wall of the rotating shaft, and the balancing chamber 7 is configured to balance air pressure in the cylinder 1 and air pressure of an external environment, so as to reduce a cold air suction amount.

Wherein, barrel 1 can overlap in the pivot for the pivot normally rotates in barrel 1, in order to carry out the transmission. The cylinder 1 can be fixed by connecting the cylinder 1 to the housing of the fan, so that the cylinder 1 can seal the housing part of the fan facing the cylinder 1, and the shaft seal is realized.

The first sealing ring piece 4 and the inner cylinder wall of the cylinder body 1 are integrally formed, and the first sealing ring piece 4 is located between the inner cylinder wall of the cylinder body 1 and the rotating shaft, so that shaft seal can be realized. Through the balance chamber 7 that sets up between the outer wall at the inner tube wall of barrel 1 and pivot, thereby external gas when the gap position between first seal ring piece 4 and the pivot is gone into, need earlier through balance chamber 7, and after filling gas in balance chamber 7, atmospheric pressure has in balance chamber 7, along with the operation of fan this moment, even when the inside negative pressure that produces of fan, balance chamber 7 can produce the transition cushioning effect, external cold air can not enter into balance chamber 7 fast this moment, thereby external cold air's the inspiratory capacity has been reduced greatly.

Among the above-mentioned technical scheme, can realize sealing the pivot department of fan through barrel 1 and the first seal ring piece 4 that sets up to guarantee the suction effect of fan, realize the normal operating of fan. Atmospheric pressure and external environment's atmospheric pressure in the barrel 1 can be balanced through the balance chamber 7 that sets up, can form transition space through balance chamber 7, the negative pressure direct action of avoiding the inside production of fan is in the gap department between first seal ring piece 4 and pivot, thereby the suction capacity to external cold air has been reduced, condensation can not appear in the fan inside, can avoid the inside flue gas of fan to receive the condensation problem of absorption appearing in the fan, avoid influencing the operating efficiency of fan.

Optionally, in an embodiment of the present disclosure, a second seal ring plate 5 disposed along a radial direction is formed on an inner cylinder wall of the cylinder 1, the second seal ring plate 5 is located in a middle of the cylinder 1, one end of the second seal ring plate 5, which is away from the inner cylinder wall of the cylinder 1, is in sealing contact with an outer wall of the rotating shaft, and the first seal ring plate 4, the second seal ring plate 5, a part of the position of the rotating shaft, and a part of the position of the inner cylinder wall of the cylinder 1 together enclose a balance chamber 7.

Wherein, second seal ring piece 5 is parallel with first seal ring piece 4, and first seal ring piece 4 and second seal ring piece 5 all set up along the radial direction of barrel 1 to do benefit to the outer wall of countershaft and seal. The second sealing ring piece 5 is integrally formed with the inner cylinder wall of the cylinder body 1. The radial widths of the first seal ring piece 4 and the second seal ring piece 5 can be set according to the position of the rotating shaft.

Wherein, the outer wall that the second seal ring piece 5 can the countershaft carries out the secondary seal to separate through second seal ring piece 5 between balance chamber 7 and the fan is inside, and the sealed contact of the outer wall of second seal ring piece 5 and pivot, make the atmospheric pressure in the balance chamber 7 can be more stable, can not appear reducing on a large scale because the inside formation negative pressure of fan, thereby the reduction that can be better is to the suction volume of cold air.

Specifically, the balance chamber 7 is formed by the first seal ring piece 4, the second seal ring piece 5, a part of the position of the rotating shaft and a part of the position of the inner cylinder wall of the cylinder body 1, and then the balance chamber 7 is an annular chamber.

Optionally, in an embodiment of the present disclosure, a second seal tooth is formed on a surface of the second seal ring sheet 5 for contacting with the outer wall of the rotating shaft.

In the embodiment, the second sealing teeth are used for contacting with the outer wall of the rotating shaft, the rotation of the rotating shaft can not be influenced through the second sealing teeth, meanwhile, the sealing gap can be reduced, the sealing resistance is increased, and excessive gas in the balance chamber 7 is prevented from entering the fan.

Optionally, in an embodiment of the present disclosure, a second gap is formed between the second seal tooth and the outer wall of the rotating shaft, and a width of the second gap is 0.5 to 1mm.

In the embodiment, when the width of the second gap is 0.5-1mm, the rotation of the rotating shaft is not affected, the sealing effect can be ensured, and the influence on the balance action of the balance chamber 7 caused by excessive gas in the balance chamber 7 entering the fan is avoided, so that the external cold air is prevented from entering the fan.

Optionally, in an embodiment of the present disclosure, the cylinder 1 is provided with an air guide hole 3 communicating with the balance chamber 7, and the air guide hole 3 is used for introducing gas to replenish the balance chamber 7 with gas.

Wherein, in this embodiment, do benefit to leading-in gas in to balance chamber 7 through wind-guiding hole 3, make balance chamber 7 have atmospheric pressure, and can be the same with external environment's atmospheric pressure, when the fan operates, the atmospheric pressure in the balance chamber 7 reduces by a small margin, balance chamber 7 plays the cushioning effect, thereby can not produce strong suction effect, make the cold air among the external environment can only a small amount by the suction enter into balance chamber 7, and temporary storage is in balance chamber 7, thereby avoid the inside condensation effect that produces of fan. When the gas in the balance chamber 7 is reduced, the gas can be supplemented through the air guide holes 3, so that the air pressure in the balance chamber 7 is ensured, and the transitional buffer effect is ensured.

Optionally, in an embodiment of the present disclosure, the fan shaft sealing device further includes an air guide pipe, a first end of the air guide pipe is connected to the air guide hole 3, and a second end of the air guide pipe is connected to the air outlet end of the fan, so that the air generated by the fan flows into the balance chamber 7.

Wherein, in this embodiment, the guide duct is arranged in leading-in to balance chamber 7 with the wind that the fan produced, thereby make the gas in balance chamber 7 have the uniform temperature, after being sucked by the fan, condensation action also can not appear more, the guide duct can be continuous to make up gas in balance chamber 7 simultaneously, when the fan operates, the part gas in balance chamber 7 flows into in the fan through second seal ring 5, the guide duct can in time make up gas in balance chamber 7 this moment, make the atmospheric pressure in balance chamber 7 obtain recovering and keeping, thereby can more effectively prevent external cold air to enter into balance chamber 7, just also avoid external cold air to enter into inside the fan, the normal operating of fan has been guaranteed.

Optionally, in an embodiment of the present disclosure, one end of the first sealing ring piece 4 away from the inner cylinder wall of the cylinder body 1 is provided with a soft sealing ring 6, and the soft sealing ring 6 is configured to be in sealing contact with the outer wall of the rotating shaft.

In the present embodiment, the soft sealing ring 6 is ring-shaped and is fixedly connected to the annular wall of the first sealing ring piece 4 close to the rotating shaft, and the soft sealing ring 6 contacts with the outer wall of the rotating shaft, so that the gap can be reduced, and the sealing performance can be improved.

Optionally, in an embodiment of the present disclosure, a face of the soft sealing ring 6, which is used for contacting with the outer wall of the rotating shaft, is formed with a first sealing tooth.

In the present embodiment, the first sealing tooth is used to contact with the outer wall of the rotating shaft, and the first sealing tooth can reduce the sealing gap and increase the sealing resistance without affecting the rotation of the rotating shaft, thereby preventing the outside air from flowing into the balance chamber 7.

Optionally, in an embodiment of the present disclosure, a first gap is formed between the first seal tooth and the outer wall of the rotating shaft, and a width of the first gap is 0.5 to 1mm.

In the embodiment, when the width of the first gap is 0.5-1mm, the rotation of the rotating shaft is not affected, the sealing effect can be ensured, the influence on the balance effect of the balance chamber 7 caused by too much external cold air entering the balance chamber 7 is avoided, and the external cold air can be prevented from entering the fan.

Optionally, in an embodiment of the present disclosure, a first connecting flange 2 is formed on the first end of the cylinder 1, and the first connecting flange 2 is used for connecting with a housing of the blower.

Wherein, in this embodiment, on being connected to the shell of fan with barrel 1 through first flange 2 is convenient, also can conveniently dismantle and maintain, can guarantee the joint strength of the shell of barrel 1 and fan simultaneously.

Another aspect of the present disclosure further provides an induced draft fan, which includes a motor body 14, an impeller, a volute 9, a coupling 12, and the above fan shaft seal device.

The motor body 14 is provided with a motor shaft 13, the impeller is provided with a fan shaft 10, the impeller is rotatably arranged in the volute 9, the motor shaft 13 and the fan shaft 10 are connected through a coupler 12 and jointly form a rotating shaft, the first end of the cylinder 1 is connected with the volute 9 so that the rotating shaft penetrates through the cylinder 1, and the first sealing ring piece 4 is used for sealing the outer wall of the coupler 12.

In the present embodiment, the motor shaft 13 and the fan shaft 10 are connected by the coupling 12 and then can rotate coaxially, so that the motor body 14 drives the impeller to rotate by the rotating shaft, thereby realizing a suction effect. Wherein the impeller rotates in the volute 9, generating a suction force, and the volute 9 serves to protect the impeller.

The volute 9 is provided with a second connecting flange 11, the connection between the cylinder 1 and the volute 9 is realized through the connection between the second connecting flange 11 and the first connecting flange 2, and at the moment, the cylinder 1 is used for sealing the connection position between the volute 9 and the fan shaft 10 to realize shaft seal.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The fan shaft sealing device is characterized by comprising a barrel, wherein a first end of the barrel is used for being connected to a shell of a fan, so that a rotating shaft of the fan can penetrate through the barrel, a first sealing ring piece arranged along the radial direction is formed at a second end of the barrel, one end, far away from an inner barrel wall of the barrel, of the first sealing ring piece is used for sealing an outer wall of the rotating shaft, a balance chamber is arranged between the inner barrel wall of the barrel and the outer wall of the rotating shaft, and the balance chamber is used for balancing air pressure in the barrel and air pressure of the external environment, so that the cold air suction amount is reduced.

2. The fan shaft seal device according to claim 1, wherein a second sealing ring piece is formed on the inner cylinder wall of the cylinder body and arranged along the radial direction, the second sealing ring piece is located in the middle of the cylinder body, one end, away from the inner cylinder wall of the cylinder body, of the second sealing ring piece is in sealing contact with the outer wall of the rotating shaft, and the first sealing ring piece, the second sealing ring piece, a part of the position of the rotating shaft and a part of the position of the inner cylinder wall of the cylinder body jointly enclose the balance chamber.

3. The fan shaft seal of claim 2, wherein the second seal ring segment has a second seal tooth formed on a surface thereof for contacting the outer wall of the shaft.

4. The fan shaft seal device of claim 3, wherein a second gap is formed between the second sealing tooth and the outer wall of the rotating shaft, and the width of the second gap is 0.5-1mm.

5. The fan shaft seal device of claim 1, wherein the cylinder has air holes communicating with the balance chamber, and the air holes are used for introducing air to supplement air into the balance chamber.

6. The fan shaft seal assembly of claim 5, further comprising a wind guide pipe, wherein a first end of the wind guide pipe is connected to the wind guide hole, and a second end of the wind guide pipe is connected to the wind outlet end of the fan, so that the wind generated by the fan can flow into the balance chamber.

7. The fan shaft seal device of claim 1, wherein a soft sealing ring is disposed at an end of the first sealing ring away from the inner cylinder wall of the cylinder, and the soft sealing ring is configured to be in sealing contact with the outer wall of the rotating shaft.

8. The fan shaft seal device of claim 7, wherein a first seal tooth is formed on a surface of the soft seal ring contacting with the outer wall of the rotating shaft, a first gap is formed between the first seal tooth and the outer wall of the rotating shaft, and the width of the first gap is 0.5-1mm.

9. A fan shaft seal according to any one of claims 1-8, wherein the first end of the cartridge body has a first coupling flange formed thereon for coupling with a housing of the fan.

10. An induced draft fan, characterized by comprising a motor body, an impeller, a volute, a coupling and a fan shaft seal device according to any one of claims 1 to 9;