Shaft end sealing structure of carbon black centrifugal fan

Abstract

The invention discloses a shaft end sealing structure of a carbon black centrifugal fan. The shaft end sealing structure comprises a centrifugal fan main body, the fan motor is mounted on the centrifugal fan main body; the fan bearing box is arranged on the centrifugal fan main body and is connected with the fan motor; the fan volute is mounted on the centrifugal fan main body; the fan shaft is arranged in the fan bearing box and is connected with the fan motor; and the fan shaft end sealing element is arranged on the fan shaft and is connected with the fan volute. The sealing packing in the fan shaft end sealing piece is made of a graphite material, the sealing gas ring is made of a ceramic material, so that the shaft end sealing structure can resist high temperature, tight sealing is achieved under the positive pressure condition through the three layers of sealing packing, and it is guaranteed that sealing damage does not occur when the fan has dynamic balance fluctuation through the sealing packing mode; the use condition of the sealing effect can be judged by adopting nitrogen sealing, the filler is adjusted in time, the maintenance frequency is reduced, the maintenance period is prolonged, and the symmetrical upper and lower parts are convenient to disassemble and assemble.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to a shaft end sealing structure of a carbon black centrifugal fan. Background Art

[0002] When producing carbon black, centrifugal fans are required to transport carbon black materials and exhaust gas generated during the production process. The following problems arise in the process of transporting carbon black exhaust gas: Because carbon black exhaust gas has high temperature, is transported under positive pressure, and is a toxic and flammable gas, carbon black exhaust gas is subject to key environmental supervision and there are strict requirements on the amount of exhaust gas leakage.

[0003] At present, centrifugal fans are mostly used to transport exhaust gas. The structure of centrifugal fans is as follows: Figure 1 As shown, when a centrifugal fan is used to transport exhaust gas, the high temperature often causes the overall expansion of the fan casing and the increase in the gap between the fan shaft, which is prone to leakage. At present, the methods to solve this problem mainly include the following. Packing seal: It can adapt to the dynamic balance fluctuation and high temperature of the fan. Since the packing seal has only two layers of packing, it needs to be maintained by maintenance personnel every day, and it is easy to have excessive leakage due to poor sealing during use. This type of seal is inconvenient to disassemble. Labyrinth seal: It can adapt to high temperatures and achieve leakage standards under positive pressure conditions, but this type of seal is easily damaged when encountering dynamic balance fluctuations. Air ring seal: It can adapt to high temperatures and achieve leakage standards under positive pressure conditions, but this type of seal is easily damaged when encountering dynamic balance fluctuations. Therefore, there is an urgent need for a carbon black centrifugal fan shaft end sealing structure to solve the shortcomings of the existing technology. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention designs a carbon black centrifugal fan shaft end sealing structure, comprising: a centrifugal fan body; a fan motor, mounted on the centrifugal fan body; a fan bearing box, mounted on the centrifugal fan body and connected to the fan motor; a fan volute, mounted on the centrifugal fan body; a fan shaft, arranged in the fan bearing box and connected to the fan motor; and a fan shaft end seal, mounted on the fan shaft and connected to the fan volute.

[0005] Preferably, the fan shaft end seal includes: a sealing shell, which is arranged on the outside of the fan shaft and connected to the fan volute; a sealing cover, which is arranged between the fan shaft and the sealing shell and is located on the side away from the fan volute, and is connected to the fan shaft and the sealing shell; a sealing sleeve, which is arranged between the fan shaft and the sealing shell and is located on the side close to the fan volute; a sealing gas ring, which is arranged between the sealing cover and the sealing sleeve; and a nitrogen inlet and outlet gas nozzle, which is connected to the sealing gas ring.

[0006] Preferably, the fan shaft end seal also includes: a sealing filler, which is arranged between the sealing gland and the sealing sleeve and is used to fill the gap formed between the sealing gland, the sealing sleeve and the sealing gas ring; and a gland fixing member, which is used to connect the sealing housing and the sealing gland.

[0007] Preferably, the sealing housing includes: a first sealing ring, which is arranged on the outside of the fan shaft, and the sealing cover and the sealing sleeve are both located between the fan shaft and the first sealing ring; a first connecting member, which is arranged on the outside of the first sealing ring and located on the side close to the fan volute, and is used to connect with the fan volute; a second connecting member, which is arranged on the outside of the first sealing ring and located on the side away from the fan volute, and is used to connect with the sealing cover; a reinforcement member, which is arranged between the first connecting member and the second connecting member.

[0008] Preferably, the sealing gland includes: a second sealing ring, which is arranged between the fan shaft and the first sealing ring; and a fourth connecting member, which is arranged on the outer side of the second sealing ring and connected to the second connecting member.

[0009] Preferably, the second connecting member is provided with a first connecting hole, the fourth connecting member is provided with a second connecting hole, the first connecting hole matches the second connecting hole, and the first connecting hole and the second connecting hole are fixedly connected by bolts.

[0010] Preferably, a clamping ring is provided on the inner side of the first sealing ring and is arranged on a side close to the fan volute for clamping with the sealing sleeve.

[0011] Preferably, there are two sealed shells, the two sealed shells are symmetrical in structure, and a third connecting piece is provided on the sealed shells, and the two sealed shells are connected via the third connecting piece.

[0012] Preferably, there are two sealing glands, the two sealing glands are symmetrical in structure, and a fifth connecting piece is provided on the sealing glands, and the two sealing glands are connected via the fifth connecting piece.

[0013] Preferably, the sealing gas ring is made of ceramic, and the sealing filler is made of graphite.

[0014] Compared with the closest prior art, the beneficial effects of the present invention are: 1. The sealing packing of the present invention is made of graphite material and the sealing gas ring is made of ceramic material to ensure that the shaft end sealing structure can withstand high temperatures; three layers of sealing packing and nitrogen are used to ensure that the shaft end sealing structure is tightly sealed under positive pressure; the sealing packing form is adopted, and the distance between the sealing housing and the fan shaft can be appropriately enlarged according to actual conditions to ensure that the seal is not damaged when the fan has dynamic balance fluctuations; nitrogen sealing is adopted to improve the sealing effect and judge the sealing effect according to the use of nitrogen, and adjust the packing in time, thereby reducing the number of maintenance and extending the maintenance cycle; the sealing housing, sealing cover, sealing sleeve, and sealing gas ring adopt an upper and lower two-part structure for easy disassembly and assembly.

[0015] 2. The present invention preliminarily realizes the fan sealing through the first layer of sealing filler, and seals the gas in the fan and the nitrogen; nitrogen is introduced, and the nitrogen pressure is higher than the fan outlet pressure, so as to realize the secondary fan sealing; the second and third layers of sealing fillers realize the fan sealing again, and seal the nitrogen and the outside world. The fan sealing is guaranteed to be tight through three sealings, and the material filling method and the appropriate increase in the gap between the sealing shell and the fan shaft can effectively reduce the influence of the dynamic balance fluctuation of the fan on the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the shaft end sealing structure of a carbon black centrifugal fan in the prior art.

[0017] Figure 2 It is a schematic diagram of the shaft end sealing structure of the carbon black centrifugal fan of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the fan shaft end seal of the present invention.

[0019] Figure 4 It is a first structural schematic diagram of the sealed housing of the present invention.

[0020] Figure 5 It is a second structural schematic diagram of the sealed housing of the present invention.

[0021] Figure 6 It is a first structural schematic diagram of the sealing gland of the present invention.

[0022] Figure 7 It is a second structural schematic diagram of the sealing gland of the present invention.

[0023] Reference numerals: 1- centrifugal fan body, 2- fan motor, 3- fan bearing box, 4- fan volute, 5- fan shaft, 6- fan shaft end seal, 61- sealing shell, 611- first sealing ring, 612- clamping ring, 613- first connecting piece, 614- second connecting piece, 615- first connecting hole, 616- reinforcement piece, 617- third connecting piece, 62- sealing cover, 621- second sealing ring, 622- fourth connecting piece, 623- second connecting hole, 624- fifth connecting piece, 63- sealing sleeve, 64- sealing gas ring, 65- sealing packing, 66- nitrogen inlet and outlet nozzles, 67- cover fixing piece. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 2-Figure 7 As shown, the present invention provides a carbon black centrifugal fan shaft end sealing structure, including: a centrifugal fan body 1, a fan motor 2, a fan bearing box 3, a fan volute 4, a fan shaft 5 and a fan shaft end seal 6. The fan motor 2 is mounted on the centrifugal fan body 1. The fan bearing box 3 is mounted on the centrifugal fan body 1 and connected to the fan motor 2. The fan volute 4 is mounted on the centrifugal fan body 1. The fan shaft 5 is arranged in the fan bearing box 3 and connected to the fan motor 2. The fan shaft end seal 6 is mounted on the fan shaft 5 and connected to the fan volute 4.

[0026] In a preferred embodiment, the fan shaft end seal 6 includes: a sealing housing 61, a sealing gland 62, a sealing sleeve 63, a sealing gas ring 64 and a nitrogen inlet and outlet gas nozzle 66. The sealing housing 61 is arranged on the outside of the fan shaft 5 and is connected to the fan volute 4. The sealing gland 62 is arranged between the fan shaft 5 and the sealing housing 61, and is located on the side away from the fan volute 4, and is connected to the fan shaft 5 and the sealing housing 61. The sealing sleeve 63 is arranged between the fan shaft 5 and the sealing housing 61, and is located on the side close to the fan volute 4. The sealing gas ring 64 is arranged between the sealing gland 62 and the sealing sleeve 63. The nitrogen inlet and outlet gas nozzle 66 is connected to the sealing gas ring 64. The fan is initially sealed through the first layer of sealing filler, and the gas in the fan is sealed with nitrogen; nitrogen is introduced with a nitrogen pressure higher than the fan outlet pressure to achieve secondary fan sealing; the second and third layers of sealing fillers seal the fan again and seal the nitrogen with the outside world. The fan is tightly sealed through three seals. The material filling method and the appropriate increase in the gap between the sealing shell and the fan shaft can effectively reduce the impact of the dynamic balance fluctuation of the fan on the seal.

[0027] In a preferred embodiment, the fan shaft end seal 6 further includes: a sealing packing 65 and a gland fixing member 67. The sealing packing 65 is arranged between the sealing gland 62 and the sealing shaft sleeve 63, and is used to fill the gap formed between the sealing gland 62, the sealing shaft sleeve 63 and the sealing gas ring 64. The gland fixing member 67 is used to connect the sealing housing 61 and the sealing gland 62.

[0028] In a preferred embodiment, the sealing housing 61 includes: a first sealing ring 611, a first connecting member 613, a second connecting member 614 and a reinforcing member 616. The first sealing ring 611 is arranged on the outside of the fan shaft 5, and the sealing gland 62 and the sealing sleeve 63 are both located between the fan shaft 5 and the first sealing ring 611. The first connecting member 613 is arranged on the outside of the first sealing ring 611 and is located on the side close to the fan volute 4, and is used to connect with the fan volute 4. The second connecting member 614 is arranged on the outside of the first sealing ring 611 and is located on the side away from the fan volute 4, and is used to connect with the sealing gland 62. The reinforcing member 616 is arranged between the first connecting member 613 and the second connecting member 614.

[0029] In a preferred embodiment, the sealing gland 62 includes: a second sealing ring 621 and a fourth connecting member 622. The second sealing ring 621 is arranged between the fan shaft 5 and the first sealing ring 611. The fourth connecting member 622 is arranged outside the second sealing ring 621 and connected to the second connecting member 614.

[0030] In a preferred embodiment, a first connection hole 615 is provided on the second connection member 614, and a second connection hole 623 is provided on the fourth connection member 622. The first connection hole 615 matches the second connection hole 623, and the first connection hole 615 and the second connection hole 623 are fixedly connected by bolts.

[0031] In a preferred embodiment, a clamping ring 612 is provided inside the first sealing ring 611 and is disposed on a side close to the fan volute 4 for clamping with the sealing sleeve 63 .

[0032] In a preferred embodiment, there are two sealed housings 61 , the two sealed housings 61 are symmetrically structured, and a third connecting member 617 is disposed on the sealed housing 61 , and the two sealed housings 61 are connected via the third connecting member 617 .

[0033] In a preferred embodiment, there are two sealing glands 62 , the two sealing glands 62 are symmetrical in structure, and a fifth connecting member 624 is provided on the sealing glands 62 , and the two sealing glands 62 are connected via the fifth connecting member 624 .

[0034] In a preferred embodiment, the sealing gas ring 64 is made of ceramic, and the sealing filler 65 is made of graphite.

[0035] In a preferred embodiment, the installation of the fan shaft end seal 6 includes the following steps: installing the nitrogen inlet and outlet nozzles 66, installing the nitrogen inlet and outlet nozzles 66 on the sealing shell 61 and tightening. Installing the sealing shell 61, adjusting the distance between the sealing shell 61 and the fan shaft 5, and welding the sealing shell 61 to the fan volute 4. Installing the sealing sleeve 63, installing the sealing sleeve 63 between the fan shaft 5 and the sealing shell 61, and rotating the sealing sleeve 63 and the sealing shell 61 by 90° for installation. Installing the first layer of sealing packing 65, cutting the sealing packing 65 to a suitable length along the axial direction at an angle of 45°, and filling it between the sealing shell 61 and the fan shaft 5. Installing the sealing gas ring 64, and installing the sealing gas ring 64 between the fan shaft 5 and the sealing shell 61. Installing the second and second layers of sealing packing 65, cutting the sealing packing 65 to a suitable length along the axial direction at an angle of 45°, and filling it between the sealing shell 61 and the fan shaft 5, and repeating twice. Install the sealing gland 62, install the sealing gland 62 between the fan shaft 5 and the sealing housing 61, and connect them through the gland fixing 67. Install the nitrogen pipe, and use a hose to connect the nitrogen main pipe and the nitrogen inlet and outlet nozzles 66. Debug, start the fan by jogging. After the fan rotates for a few minutes, debug it through the gland fixing 67. Run, open the nitrogen control valve before starting the fan, and start the fan.

[0036] The sealing packing is made of graphite and the sealing gas ring is made of ceramic to ensure that the shaft end sealing structure can withstand high temperatures; three-layer sealing packing and nitrogen are used to ensure that the shaft end sealing structure can achieve tight sealing under positive pressure; the sealing packing form is adopted, and the distance between the sealing housing and the fan shaft can be appropriately enlarged according to the actual situation to ensure that the seal is not damaged when the fan has dynamic balance fluctuations; the use of nitrogen sealing can not only improve the sealing effect but also judge the sealing effect according to the use of nitrogen, adjust the packing in time, reduce the maintenance times and extend the maintenance cycle; the sealing housing, sealing cover, sealing sleeve and sealing gas ring adopt an upper and lower two-part structure for easy disassembly and assembly.

[0037] The fan is initially sealed through the first layer of sealing filler, and the gas in the fan is sealed with nitrogen; nitrogen is introduced with a nitrogen pressure higher than the fan outlet pressure to achieve secondary fan sealing; the second and third layers of sealing fillers seal the fan again and seal the nitrogen with the outside world. The fan is tightly sealed through three seals. The material filling method and the appropriate increase in the gap between the sealing shell and the fan shaft can effectively reduce the impact of the dynamic balance fluctuation of the fan on the seal.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A carbon black centrifugal fan shaft end sealing structure, characterized in that: include: Centrifugal fan body (1); A fan motor (2) mounted on the centrifugal fan body (1); A fan bearing box (3) is mounted on the centrifugal fan body (1) and connected to the fan motor (2); A fan volute (4) mounted on the centrifugal fan body (1); A fan shaft (5) is disposed in the fan bearing box (3) and is connected to the fan motor (2); A fan shaft end seal (6) is mounted on the fan shaft (5) and connected to the fan volute (4).

2. The carbon black centrifugal fan shaft end sealing structure according to claim 1, characterized in that: The fan shaft end seal (6) comprises: A sealing housing (61) is arranged on the outside of the fan shaft (5) and is connected to the fan volute (4); A sealing gland (62) is arranged between the fan shaft (5) and the sealing housing (61), is located on a side away from the fan volute (4), and is connected to the fan shaft (5) and the sealing housing (61); A sealing sleeve (63) is arranged between the fan shaft (5) and the sealing housing (61), and is located on a side close to the fan volute (4); A sealing gas ring (64) is arranged between the sealing gland (62) and the sealing shaft sleeve (63); A nitrogen inlet and outlet gas nozzle (66) is connected to the sealing gas ring (64).

3. The carbon black centrifugal fan shaft end sealing structure according to claim 2, characterized in that: The fan shaft end seal (6) further comprises: A sealing filler (65) is arranged between the sealing gland (62) and the sealing shaft sleeve (63) and is used to fill a gap formed between the sealing gland (62), the sealing shaft sleeve (63) and the sealing gas ring (64); A gland fixing member (67) is used to connect the sealing housing (61) and the sealing gland (62).

4. The carbon black centrifugal fan shaft end sealing structure according to claim 3, characterized in that: The sealed housing (61) comprises: A first sealing ring (611) is arranged on the outside of the fan shaft (5), and the sealing gland (62) and the sealing sleeve (63) are both located between the fan shaft (5) and the first sealing ring (611); A first connecting member (613) is arranged on the outside of the first sealing ring (611) and is located on a side close to the fan volute (4), and is used to be connected to the fan volute (4); A second connecting member (614) is arranged on the outside of the first sealing ring (611) and is located on a side away from the fan volute (4), and is used to be connected to the sealing gland (62); A reinforcing member (616) is arranged between the first connecting member (613) and the second connecting member (614).

5. The carbon black centrifugal fan shaft end sealing structure according to claim 4, characterized in that: The sealing gland (62) comprises: A second sealing ring (621) is arranged between the fan shaft (5) and the first sealing ring (611); The fourth connecting member (622) is arranged on the outside of the second sealing ring (621) and is connected to the second connecting member (614).

6. The carbon black centrifugal fan shaft end sealing structure according to claim 5, characterized in that: The second connecting member (614) is provided with a first connecting hole (615), the fourth connecting member (622) is provided with a second connecting hole (623), the first connecting hole (615) matches the second connecting hole (623), and the first connecting hole (615) and the second connecting hole (623) are fixedly connected by bolts.

7. The carbon black centrifugal fan shaft end sealing structure according to claim 4, characterized in that: A clamping ring (612) is provided on the inner side of the first sealing ring (611) and is arranged on a side close to the fan volute (4) for clamping with the sealing shaft sleeve (63).

8. The carbon black centrifugal fan shaft end sealing structure according to claim 2, characterized in that: The number of the sealed housings (61) is two, the two sealed housings (61) are symmetrical in structure, and a third connecting piece (617) is provided on the sealed housing (61), and the two sealed housings (61) are connected via the third connecting piece (617).

9. The carbon black centrifugal fan shaft end sealing structure according to claim 2, characterized in that: The number of the sealing glands (62) is two, the two sealing glands (62) are symmetrical in structure, and a fifth connecting member (624) is provided on the sealing gland (62), and the two sealing glands (62) are connected via the fifth connecting member (624).

10. The carbon black centrifugal fan shaft end sealing structure according to claim 3, characterized in that: The sealing gas ring (64) is made of ceramic, and the sealing filler (65) is made of graphite.

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