CN212838547U - Self-suction type fan shaft sealing device - Google Patents
Self-suction type fan shaft sealing device Download PDFInfo
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- CN212838547U CN212838547U CN202021931161.XU CN202021931161U CN212838547U CN 212838547 U CN212838547 U CN 212838547U CN 202021931161 U CN202021931161 U CN 202021931161U CN 212838547 U CN212838547 U CN 212838547U
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Abstract
The utility model relates to a fan shaft seal technical field is a from inhaling formula fan shaft seal, and it includes left shaft seal box and right shaft seal box, and left shaft seal box suit is epaxial at the fan outside centrifugal fan's casing left side, and left shaft seal box's right side is fixed on centrifugal fan's casing left side outer wall, and right shaft seal box suit is epaxial at the fan outside centrifugal fan's casing right side, and right shaft seal box's left side is fixed on centrifugal fan's casing right side outer wall. The utility model has the advantages of reasonable and compact structure, convenient to use, the suction that its adoption centrifugal fan self import fluidic flow brought, to the import right side establish the poisoning medium that centrifugal fan body was revealed out by the axle clearance and carry out from inhaling the formula sealing, have simple feasible, the reliability is high, environmental protection and energy saving, easily realize characteristics.
Description
Technical Field
The utility model relates to a fan shaft seal technical field is a from inhaling formula fan shaft seal.
Background
At present, boilers are indispensable in the industries of petrifaction, coal chemical industry, electric power, smelting, heat supply and the like, and centrifugal induced draft fans matched with the boilers are indispensable equipment of the boilers. Its advantages are simple structure, high flow rate and stable running. However, as the medium flowing through the draught fan is flue gas, the sealing performance of the draught fan is related to the problems of safety, environmental protection and the like, especially in the north, the equipment is generally in a closed factory building due to the influence of the temperature in winter in the north, and the draught fan is convenient to prevent freezing. However, once the flue gas leaks, the flue gas containing a large amount of sulfide and nitrogen oxide is fatal to operators. From the point of view of the field reaction, the leakage part of the induced draft fan body is basically an axle clearance (mostly the outlet side, and rarely the inlet also leaks due to the design reason). At present, the fan shaft seal in the industry or China is mostly sealed by a filler and a sealing ring, and the fan shaft seal is characterized in that:
(1) and (3) packing and sealing: at present, most of the packing is graphite packing or asbestos ropes which are characterized by simple structure and convenient replacement, but have poor durability, particularly, the packing of the asbestos ropes loses the sealing effect basically in 2 months and cannot ensure long-period safe operation;
(2) sealing ring: labyrinth type and multi-stage packing ring type. The sealing device has good sealing effect, but the mounting structure of the sealing device is generally large, the requirement on the mounting position is high, and after a long time, the sealing structure can not completely seal the smoke and has a small amount of leakage;
therefore, for equipment for conveying toxic media in a northern closed space, a sealing device which is simple in structure, convenient to install, small in installation size and capable of being completely sealed is urgently needed.
Disclosure of Invention
The utility model provides a from inhaling formula fan shaft seal device has overcome above-mentioned prior art not enough, and it can effectively solve current fan shaft seal mode and have the not good problem of sealed effect.
The technical scheme of the utility model is realized through following measure: a self-suction type fan shaft sealing device comprises a left shaft sealing box and a right shaft sealing box, wherein the left shaft sealing box is sleeved on a fan shaft outside the left side of a casing of a centrifugal fan, the right side of the left shaft sealing box is fixed on the outer wall of the left side of the casing of the centrifugal fan, the right shaft sealing box is sleeved on the fan shaft outside the right side of the casing of the centrifugal fan, and the left side of the right shaft sealing box is fixed on the outer wall of the right side of the casing of the centrifugal fan; a left connecting pipe is communicated between the left shaft sealing box and the inlet of the centrifugal fan, and a right connecting pipe is communicated between the right shaft sealing box and the inlet of the centrifugal fan.
The following are further optimization or/and improvement of the technical scheme of the utility model:
a gap is arranged between the left end of the left shaft sealing box and the fan shaft; a gap is arranged between the right end of the right shaft sealing box and the fan shaft.
The left connecting pipe and the right connecting pipe are both provided with regulating valves.
The included angle between the section of the left connecting pipe close to the inlet of the centrifugal fan and the fan shaft is an acute angle.
The angle between the section of the left connecting pipe close to the inlet of the centrifugal fan and the fan shaft is 15-20 degrees.
The included angle between the section of the right connecting pipe close to the inlet of the centrifugal fan and the fan shaft is an acute angle.
The angle between the section of the right connecting pipe close to the inlet of the centrifugal fan and the fan shaft is 15-20 degrees.
The utility model has the advantages of reasonable and compact structure, convenient to use, the suction that its adoption centrifugal fan self import fluidic flow brought, poison medium to the centrifugal fan body of import right side by the axle clearance leakage and carry out from inhaling formula sealing, have simple feasible, the reliability is high, environmental protection and energy saving, easily characteristics that realize.
Drawings
Fig. 1 is a schematic partial sectional structure view of the preferred embodiment of the present invention.
FIG. 2 is a schematic view of the right shaft seal box and the mounting portion in a partially cut-away enlarged structure.
The codes in the figures are respectively: the structure comprises a left shaft sealing box 1, a right shaft sealing box 2, a regulating valve 3, a casing 4, a fan shaft 5, a left connecting pipe 6, a right connecting pipe 7, a gap 8 and an included angle alpha.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention will be further described with reference to the following examples and drawings:
as shown in attached figures 1 and 2, the self-suction type fan shaft sealing device comprises a left shaft sealing box 1 and a right shaft sealing box 2, wherein the left shaft sealing box 1 is sleeved on a fan shaft 5 outside the left side of a casing 4 of a centrifugal fan, the right side of the left shaft sealing box 1 is fixed on the outer wall of the left side of the casing 4 of the centrifugal fan, the right shaft sealing box 2 is sleeved on the fan shaft 5 outside the right side of the casing 4 of the centrifugal fan, and the left side of the right shaft sealing box 2 is fixed on the outer wall of the right side of the casing 4 of the centrifugal fan; a left connecting pipe 6 is communicated between the left shaft sealing box 1 and the inlet of the centrifugal fan, and a right connecting pipe 7 is communicated between the right shaft sealing box 2 and the inlet of the centrifugal fan.
When the centrifugal fan works, the inlet of the centrifugal fan sucks media such as air and the like, so that the interior of the centrifugal fan is in a negative pressure medium suction state, negative pressure is formed in the left connecting pipe 6, the left shaft sealing box 1, the right connecting pipe 7 and the right shaft sealing box 2 which are communicated with the inlet of the centrifugal fan, and therefore smoke which leaks into the left shaft sealing box 1 and the right shaft sealing box 2 through the shaft gap is sucked into the inlet of the centrifugal fan, and the purpose of sealing is achieved.
The inlet of the centrifugal fan is arranged at the left of the left shaft seal box 1.
The device adopts the suction (negative pressure) brought by the flow of the fluid at the inlet of the centrifugal fan to carry out self-suction sealing on the toxic medium leaked out of the shaft gap of the centrifugal fan body at the right side of the inlet, and has the characteristics of simplicity, feasibility, high reliability, environmental protection, energy conservation and easy realization.
When the centrifugal fan stops running (when the medium does not flow), the device cannot play a sealing role.
The left connecting pipe 6 and the right connecting pipe 7 are made of carbon steel pipes. The centrifugal fan is a public fan known in the prior art.
The self-suction type fan shaft sealing device can be further optimized or/and improved according to actual requirements:
as shown in the attached figure 2, a gap is arranged between the left end of the left shaft sealing box 1 and the fan shaft 5; a gap 8 is arranged between the right end of the right shaft sealing box 2 and the fan shaft 5.
The fluid leaking through the axial gap is generally pressureless and in a floating state. When the centrifugal fan is started, the left shaft seal box 1 and the right shaft seal box 2 are in a negative pressure state, leaked smoke is sucked into the left shaft seal box 1 and the right shaft seal box 2 through the gap 8 and finally sucked into an inlet of the centrifugal fan through the gap 8, the smoke is prevented from being leaked, and a sealing effect is achieved.
As shown in fig. 1, the regulating valve 3 is provided on each of the left and right connecting pipes 6 and 7.
The regulating valve 3 may be a ball valve or other common valve known in the art. The negative pressure is controlled by the adjusting valve 3, so that the phenomenon that the negative pressure in the left shaft seal box 1 and the right shaft seal box 2 is too large and sundries are sucked is avoided.
According to the requirement, an included angle alpha between one section of the left connecting pipe 6 close to the centrifugal fan inlet and the fan shaft 5 is an acute angle.
The angle between the section of the left connecting pipe 6 close to the inlet of the centrifugal fan and the fan shaft 5 is 15-20 degrees according to requirements.
As shown in the attached figure 1, the included angle between one section of the right connecting pipe 7 close to the inlet of the centrifugal fan and the fan shaft 5 is an acute angle.
The angle between the section of the right connecting pipe 7 close to the inlet of the centrifugal fan and the fan shaft 5 is 15-20 degrees according to requirements.
The left connecting pipe 6 and the right connecting pipe 7 close to the inlet of the centrifugal fan form an included angle of 15-20 degrees with the direction of fluid flow (a fan shaft 5), and when the flow rate of the inlet of the centrifugal fan is more than 4 m/s, formed negative pressure sucks a medium leaked out through a shaft gap into the inlet again, so that the medium leakage is avoided, and a sealing effect is achieved.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (10)
1. A self-suction type fan shaft sealing device is characterized by comprising a left shaft sealing box and a right shaft sealing box, wherein the left shaft sealing box is sleeved on a fan shaft outside the left side of a casing of a centrifugal fan; a left connecting pipe is communicated between the left shaft sealing box and the inlet of the centrifugal fan, and a right connecting pipe is communicated between the right shaft sealing box and the inlet of the centrifugal fan.
2. The self-priming fan shaft sealing device of claim 1, wherein a gap is provided between the left end of the left shaft sealing box and the fan shaft; a gap is arranged between the right end of the right shaft sealing box and the fan shaft.
3. The self-priming fan shaft sealing device of claim 1 or 2, wherein the left connecting pipe and the right connecting pipe are both provided with regulating valves.
4. The self-priming fan shaft sealing device of claim 1 or 2, wherein the angle between the section of the left connection tube adjacent to the inlet of the centrifugal fan and the fan shaft is acute.
5. The self-priming fan shaft seal of claim 3 wherein the angle between the segment of the left connector adjacent the inlet of the centrifugal fan and the fan shaft is acute.
6. The self-priming fan shaft seal of claim 5 wherein the angle between the section of the left connector adjacent the inlet of the centrifugal fan and the fan shaft is from 15 to 20 degrees.
7. The self-priming fan shaft sealing device of claim 1, 2, 5 or 6 wherein the right connecting tube section near the inlet of the centrifugal fan forms an acute angle with the fan shaft.
8. The self-priming fan shaft seal assembly of claim 3 wherein the right connector segment adjacent the inlet of the centrifugal fan forms an acute angle with the fan shaft.
9. The self-priming fan shaft seal of claim 4 wherein the right section of the connector adjacent the inlet of the centrifugal fan forms an acute angle with the fan shaft.
10. The self-priming fan shaft seal assembly of claim 8 or 9 wherein the angle between the segment of the right connector adjacent the inlet of the centrifugal fan and the fan shaft is 15 to 20 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021931161.XU CN212838547U (en) | 2020-09-07 | 2020-09-07 | Self-suction type fan shaft sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021931161.XU CN212838547U (en) | 2020-09-07 | 2020-09-07 | Self-suction type fan shaft sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212838547U true CN212838547U (en) | 2021-03-30 |
Family
ID=75146407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021931161.XU Active CN212838547U (en) | 2020-09-07 | 2020-09-07 | Self-suction type fan shaft sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212838547U (en) |
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2020
- 2020-09-07 CN CN202021931161.XU patent/CN212838547U/en active Active
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