CN114135516A - General centrifugal fan that can arrange fast - Google Patents
General centrifugal fan that can arrange fast Download PDFInfo
- Publication number
- CN114135516A CN114135516A CN202111401021.0A CN202111401021A CN114135516A CN 114135516 A CN114135516 A CN 114135516A CN 202111401021 A CN202111401021 A CN 202111401021A CN 114135516 A CN114135516 A CN 114135516A
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- centrifugal fan
- general centrifugal
- fan body
- air inlet
- general
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a general centrifugal fan capable of being rapidly arranged, wherein when the general centrifugal fan moves, a jack or a top hoisting machine is firstly utilized to hoist a general centrifugal fan body away from the ground, then a sliding rail is laid below the general centrifugal fan body, a pulley is connected onto the sliding rail in a sliding manner, and the general centrifugal fan body is pulled to an appointed installation position through a cable-stayed hoist; the air inlet and the air outlet of the general centrifugal fan body are provided with high-temperature-resistant connecting hoses, and the end parts of the connecting hoses are provided with hoops used for fixing the hoses on a system pipeline. The universal centrifugal fan capable of being rapidly arranged can be conveniently and rapidly moved to a proper position, the inlet and the outlet are connected through the hose and the hoop, direct disassembly can be achieved, and disassembly time is shortened.
Description
Technical Field
The invention relates to the technical field of general centrifugal fans, in particular to a general centrifugal fan capable of being rapidly arranged.
Background
In recent years, with the strictness of national environmental protection requirements, the SCR denitration ammonia spraying system is widely adopted by thermal power generating units. General centrifugal fan is the important equipment of SCR deNOx systems hot-air, and in the operation process, operational environment is relatively poor, and operating temperature is about 600 ℃, and dilution fan opens and stops the in-process, often because of fan axle heat altered shape too big, causes the damage. Therefore, in the operation process of the thermal power generating unit, the dilution fan can be disassembled and checked within a certain period. By using the traditional connection mode and the unit moving method, the maintenance efficiency of the equipment is often reduced due to the disassembly and the movement of the equipment.
If the inlet and the outlet of the general centrifugal fan are connected with the hot air main pipe by flanges, the flanges need to be cooled by a blower before disassembly, and the temperature of the joint needs to be reduced by about 30 min/(position/person). The sealing gas and the cooling water of the general centrifugal fan are connected with external gas supply and water supply pipelines by using pipeline connectors, and the disassembly process needs about 10 min/(department/person). The power line and the secondary line of the general centrifugal fan are mostly connected by bolts, and the disassembly time is about 30 min/(department, man). When the general centrifugal fan moves, a lifting mechanism needs to be installed right above the general centrifugal fan or a jack needs to be used for lifting the machine body, then the machine body is moved to a specified position by using a steel pipe and a crowbar, and about 30min/(3 persons) is needed.
This patent adopts the connection and the removal mode that can dismantle fast, and the general centrifugal fan of rapid separation and SCR deNOx systems's is connected, and the general centrifugal fan of guarantee can carry out quick check, installation or change, reduces the system and does not have reserve fan operating duration, strengthens the operational reliability of system.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a universal centrifugal fan capable of being quickly arranged, so that the universal centrifugal fan can be quickly moved and detached, and the time of no universal centrifugal fan is shortened.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a general centrifugal fan that can arrange fast, includes general centrifugal fan body, be provided with air intake and air outlet on the general centrifugal fan body, its characterized in that: the top of the general centrifugal fan body is provided with a top hoisting machine used for hoisting the general centrifugal fan body from the ground, the general centrifugal fan body is provided with a connecting support lug used for being connected with a hoisting rope of the top hoisting machine, the hoisting rope is connected on the top hoisting machine, the front side of the general centrifugal fan body is provided with a drag hook, the drag hook is connected with a steel wire rope, the steel wire rope is connected with a diagonal block, the general centrifugal fan body is provided with a sliding track arranged along the moving direction of the general centrifugal fan, the general centrifugal fan body is provided with a pulley capable of sliding on the sliding track,
or the general centrifugal fan body is provided with a jack for separating the general centrifugal fan body from the ground;
during moving, firstly, a jack or a top hoisting machine is used for hoisting the general centrifugal fan body off the ground, then a sliding track is laid below the general centrifugal fan body, the pulley is connected to the sliding track in a sliding mode, and the general centrifugal fan body is pulled to an appointed installation position through an inclined pulling hoist;
the air inlet and the air outlet of the general centrifugal fan body are provided with high-temperature-resistant connecting hoses, and the end parts of the connecting hoses are provided with hoops used for fixing the hoses on a system pipeline.
The inlet and outlet connecting pipe of the general centrifugal fan adopts a high-temperature resistant connecting hose and a hoop. Can be directly disassembled. After the hoop is disassembled, the inlet and the outlet of the general centrifugal fan and the SCR hot air main pipe are separated by utilizing the partial telescopic characteristic of the hose.
In the scheme, the hoop is a stainless steel snap-fastener type quick-mounting hoop. The disassembly is quick.
In the above scheme, the fan body is installed on the frame, the connection journal stirrup of hoist and mount rope is on the frame, the pulley is installed on the frame.
In the above scheme, the general centrifugal fan body includes fan axle, air intake and the impeller of suit in fan axle one end, encircles the fan axle one end of keeping away from the impeller is provided with annular air inlet chamber, the air intake sets up in annular air inlet chamber upside, and the air intake opening is up, has the annular mass flow passageway that supplies the wind to pass through between air intake and impeller, the end and the impeller of annular mass flow passageway form exhaust passage, there is the sealed air of extending along fan axle axial between annular mass flow passageway and annular air inlet chamber and the fan axle and admits air the isolation channel, should admit air and keep apart the passageway and be full of sealed gas, and sealed gas flows to the one end that is close to the impeller from the one end of keeping away from the impeller.
The fan of the invention adopts air inlet from the upper side to be vertical to the fan shaft without adopting air inlet from the shaft end, high-temperature gas can not be in direct contact with the fan shaft, and the deviation of the fan shaft temperature is not too large under the running condition and the shutdown state of rated power. Before the fan is started, sealing air is filled in the sealing air inlet isolating channel to form sealing heat-insulating air between high-temperature air and the fan shaft, so that the high-temperature air is isolated from influencing the operation of the fan shaft; the high-temperature air at the inlet of the SCR dilution fan is prevented from transferring heat to the fan shaft to cause thermal deformation, the fan shaft can be made of common steel, the fan shaft can be processed by only using a common heat treatment process in the shaft processing process, the fan shaft is not required to be processed by adopting high-temperature-resistant steel, and the fan generation processing cost is reduced.
Before the SCR dilution fan is cold-started, the fan shaft is not required to be heated and then started under a low working condition, the shaft is not required to be fully preheated, and the fan switching time is reduced.
In the scheme, the fan shaft is arranged on the base through the bearing, and the motor for driving the fan shaft to rotate is also arranged on the base.
Has the advantages that: the universal centrifugal fan capable of being rapidly arranged can be conveniently and rapidly moved to a proper position, the inlet and the outlet are connected through the hose and the hoop, direct disassembly can be achieved, and disassembly time is shortened.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a general centrifugal fan.
Fig. 3 is an enlarged view of an initial portion a of fig. 2.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
as shown in fig. 1-3, the general centrifugal fan that can arrange fast, including general centrifugal fan body 1, be provided with air intake and air outlet on the general centrifugal fan body 1, its characterized in that: the top of general centrifugal fan body is equipped with and is used for hanging general centrifugal fan body 1 from the top hoist and mount machinery 10 on ground, is provided with the connection journal stirrup that is used for being connected with the hoist and mount rope 9 of top hoist and mount machinery on the general centrifugal fan body, and hoist and mount rope 9 is connected on top hoist and mount machinery 10, and top hoist and mount machinery 10 is installed on top hoist and mount machinery crossbeam 11. The front side of general centrifugal fan body is provided with drag hook 8, is connected with wire rope 7 on the drag hook 8, and wire rope 7 links to each other with cable-stayed hoist 2, and general centrifugal fan body is equipped with the slip track 4 of arranging along general centrifugal fan moving direction, is provided with on the general centrifugal fan body can be on slip track 4 gliding pulley 3.
Or the general centrifugal fan body 1 is equipped with a jack for taking the general centrifugal fan body 1 off the ground.
During moving, firstly, a jack or a top hoisting machine 10 is used for hoisting the general centrifugal fan body 1 away from the ground, then a sliding rail 4 is laid below the general centrifugal fan body 1, the pulley 3 is connected onto the sliding rail 4 in a sliding manner, and the general centrifugal fan body 1 is pulled to a specified installation position through the inclined pulling hoist 2;
the air inlet and the air outlet of the general centrifugal fan body are provided with high-temperature resistant connecting hoses 6, and the end parts of the connecting hoses 6 are provided with anchor ears 5 used for fixing the hoses on a system pipeline. The hoop 5 is a stainless steel snap-fastener type quick-mounting hoop. The fan body is installed on the frame, and the connection journal stirrup of hoist and mount rope 9 is on the frame, and pulley 3 installs on the frame.
The general centrifugal fan body is a quick-start general centrifugal fan and consists of a fan shaft end inlet sealing cover plate 1-1, a fan shaft 1-2, a sealing air inlet isolating channel 1-3, an air inlet 1-4, an annular flow collecting channel 1-5, an annular convex edge 1-6, an impeller sealing air guide hole 1-7, a sealing air outlet isolating channel 1-8, an impeller 1-9, a fan shaft end outlet sealing cover plate 1-10, a machine shell 1-11, an annular air inlet cavity 1-12, a motor 1-13 and a bearing 1-14.
The fan shaft 1-2 is made of common alloy steel such as 45# or 40 Cr. The impeller 1-9 is arranged at one end of the fan shaft 1-2 and rotates along with the fan shaft 1-2, the fan shaft 1-2 is arranged on the base through the bearing 1-14, and the motor 1-13 for driving the fan shaft 1-2 to rotate is also arranged on the base.
An annular air inlet cavity 1-12 is arranged at one end, far away from the impeller, of the surrounding fan shaft 1-2, an air inlet 1-4 is arranged at the upper side of the annular air inlet cavity, an opening of the air inlet 1-4 faces upwards, an annular flow collecting channel 1-5 for air to pass through is arranged between the air inlet and the impeller 1-9, the tail end of the annular flow collecting channel 1-5 and the impeller form an exhaust channel, a sealed air inlet isolating channel 1-3 extending along the axial direction of the fan shaft is arranged between the annular flow collecting channel 1-5 and the annular air inlet cavity and the fan shaft 1-2, sealed air is filled in the sealed air inlet isolating channel 1-3, and the sealed air flows from one end, far away from the impeller, to one end, close to the impeller.
Specifically, the method comprises the following steps: a sealing air inlet shell is sleeved outside the fan shaft 1-2 along the axial direction of the fan shaft 1-2, the sealing air inlet shell extends to the impeller 1-9, a gap between the sealing air inlet shell and the fan shaft 1-2 forms a sealing air inlet isolation channel 1-3, one end of the sealing air inlet shell, which is far away from the impeller, is provided with a fan shaft end inlet sealing cover plate 1-1 for sealing the end part of the sealing air inlet isolation channel 1-3, a sealing air inlet is arranged on the fan shaft end inlet sealing cover plate 1-1, one end of the sealing air inlet shell, which is close to the impeller 1-9, is open to form a horn-shaped sealing air retention cavity 1-301, the cavity wall of the horn-shaped sealing air retention cavity 1-301 is an arc cavity wall with the middle part protruding outwards, and a circle of ring is arranged at one side, close to the sealing air inlet shell, of the root part of the impeller 1-9, which corresponds to the end part of the sealing air inlet shell The annular groove is formed by enclosing two circles of annular convex edges 1-6 convexly arranged on the impellers 1-9, the open end of the sealed air inlet shell is clamped into the groove, and a gap which does not interfere the rotation of the impellers 1-9 is formed between the open end of the sealed air inlet shell and the groove; the root of the impeller 1-9 is provided with an impeller sealing air guide hole 1-7 for passing sealing air, a sealing air exhaust shell is sleeved outside a fan shaft at one side of the impeller 1-9, which is back to the sealing air inlet shell, a gap between the sealing air exhaust shell and the fan shaft forms a sealing air outlet isolation channel 1-8, the end part of the sealing air outlet isolation channel 1-8 is provided with a fan shaft end outlet sealing cover plate 1-10, and a fan sealing air outlet is arranged on the fan shaft end outlet sealing cover plate 1-10. Sealing rings are arranged between the fan shaft end inlet sealing cover plate 1-1 and the fan shaft end outlet sealing cover plate 1-10 and the fan shaft 1-2.
An annular air inlet cavity 1-12 is enclosed by an annular air inlet cavity shell at one side of the outside of the sealed air inlet shell close to an inlet sealing cover plate 1-1 at the shaft end of a fan, an annular flow collecting channel 1-5 is enclosed by a flow collector shell outside the sealed air inlet shell between the annular air inlet cavity and an impeller 1-9, one end of the annular collecting channel 1-5 is communicated with the annular air inlet cavity, the annular collecting channel 1-5 comprises a conical section, the caliber of one end of the conical section close to the annular air inlet cavity is larger than that of one end far away from the annular air inlet cavity, the small-caliber end of the conical section is provided with an annular end plate 501 extending outwards, the annular end plate 501 and the conical section are in arc transition connection, and the arc transition connection position corresponds to the position of the arc-shaped cavity wall of the horn-shaped sealed gas retention cavity, and an exhaust channel is formed between the annular end plate 501 and the impellers 1-9. The impeller 1-9, the current collector shell, the sealed air inlet shell and the sealed air exhaust shell are externally provided with a machine shell 1-11. The invention adopts the sealing air inlet isolation channel parallel to the fan shaft to guide the sealing air and isolate the fan shaft from the hot air channel. Ensure that the heat of the high-temperature gas is not transmitted to the fan shaft. The end of the sealed air inlet isolation channel close to the impeller is arranged in an open mode, and the impeller sealed air guide holes which are only formed in the impeller and used for allowing sealed air to pass through are formed in the impeller, so that the sealed air passes through the impeller to form vortex, the temperature of the root of the impeller is guaranteed to be within a certain range, the connecting hole between the impeller and a fan shaft is not too large due to thermal deformation, the impeller and the fan shaft connecting part are in interference fit, the fan impeller can be well assembled and fixed with the shaft, too large axial force is not generated on a collector, and the use of the fan is affected.
Meanwhile, the sealing gas in the horn-shaped sealing gas staying cavity forms certain pressure, and a mechanical labyrinth seal is formed between the annular convex edge and the sealing gas inlet shell, so that hot air is prevented from entering the sealing gas inlet isolation channel through a gap between the sealing gas inlet shell and the impeller. The amount of the seal gas flowing in the direction of the impeller is reduced.
The shaft end of the fan is sealed by the cover plate, so that sealing gas is prevented from flowing outwards.
By designing the shape of the annular flow collecting channel, the running efficiency of the SCR fan is improved.
The general centrifugal fan does not adopt shaft end air inlet, but adopts air inlet perpendicular to the fan shaft from the upper side, high-temperature gas can not be in direct contact with the fan shaft, and the deviation of the fan shaft temperature cannot be overlarge under the rated power operation condition and the shutdown state. Before the fan is started, sealing air is filled in the sealing air inlet isolating channel to form sealing heat-insulating air between high-temperature air and the fan shaft, so that the high-temperature air is isolated from influencing the operation of the fan shaft; the high-temperature air at the inlet of the general centrifugal fan is prevented from transferring heat to the fan shaft to cause thermal deformation, the fan shaft can be made of general steel, and the fan shaft can be processed only by using a general heat treatment process in the shaft processing process without using high-temperature-resistant steel to process the fan shaft, so that the fan generation processing cost is reduced.
Before the cold start of the general centrifugal fan, the fan shaft is not required to be heated and then started under a low working condition, the shaft is not required to be fully preheated, and the fan switching time is reduced.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The utility model provides a general centrifugal fan that can arrange fast, includes general centrifugal fan body (1), be provided with air intake and air outlet on general centrifugal fan body (1), its characterized in that: the top of the general centrifugal fan body is provided with a top hoisting machine (10) used for hoisting the general centrifugal fan body (1) away from the ground, the general centrifugal fan body is provided with a connecting support lug used for being connected with a hoisting rope (9) of the top hoisting machine, the hoisting rope (9) is connected to the top hoisting machine (10), the front side of the general centrifugal fan body is provided with a drag hook (8), the drag hook (8) is connected with a steel wire rope (7), the steel wire rope (7) is connected with an inclined pulling block (2), the general centrifugal fan body is provided with a sliding track (4) arranged along the moving direction of the general centrifugal fan, the general centrifugal fan body is provided with a pulley (3) capable of sliding on the sliding track (4),
or the general centrifugal fan body (1) is equipped with a jack for moving the general centrifugal fan body (1) away from the ground;
when the universal centrifugal fan moves, firstly, a jack or a top hoisting machine (10) is used for hoisting the universal centrifugal fan body (1) away from the ground, then a sliding rail (4) is laid below the universal centrifugal fan body (1), the pulley (3) is connected onto the sliding rail (4) in a sliding mode, and the universal centrifugal fan body (1) is pulled to a specified installation position through the cable-stayed hoist (2);
the air inlet and the air outlet of the general centrifugal fan body are provided with high-temperature-resistant connecting hoses (6), and the end parts of the connecting hoses (6) are provided with hoops (5) used for fixing the hoses on a system pipeline.
2. The rapidly deployable universal centrifugal fan of claim 1, further comprising: the hoop (5) is a stainless steel snap-fastener type quick-mounting hoop.
3. The rapidly deployable universal centrifugal fan according to claim 1 or 2, wherein: the fan body is installed on the frame, the connection journal stirrup of hoist and mount rope (9) is on the frame, pulley (3) are installed on the frame.
4. A rapidly arrangeable universal centrifugal fan according to claims 1-3, characterised in that: the general centrifugal fan body (1) comprises a fan shaft (1-2), an air inlet (1-4) and an impeller (1-9) sleeved at one end of the fan shaft (1-2), an annular air inlet cavity (1-12) is arranged at one end, far away from the impeller, of the fan shaft (1-2), the air inlet (1-4) is arranged on the upper side of the annular air inlet cavity, the opening of the air inlet (1-4) faces upwards, an annular flow collecting channel (1-5) through which air passes is arranged between the air inlet and the impeller (1-9), the tail end of the annular flow collecting channel (1-5) and the impeller form an exhaust channel, and a sealed air inlet isolation channel (1-3) extending along the axial direction of the fan shaft is arranged between the annular flow collecting channel (1-5) and the annular air inlet cavity and the fan shaft (1-2), the sealed air inlet isolation channel (1-3) is filled with sealed air, and the sealed air flows from one end far away from the impeller to one end close to the impeller.
5. The rapidly deployable universal centrifugal fan of claim 4, further comprising: the fan shaft (1-2) is arranged on the base through a bearing, and a motor for driving the fan shaft (1-2) to rotate is also arranged on the base.
6. The rapidly deployable universal centrifugal fan of claim 1, further comprising: the top hoisting machine (10) is arranged on a top hoisting machine beam (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111401021.0A CN114135516A (en) | 2021-11-24 | 2021-11-24 | General centrifugal fan that can arrange fast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111401021.0A CN114135516A (en) | 2021-11-24 | 2021-11-24 | General centrifugal fan that can arrange fast |
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| Publication Number | Publication Date |
|---|---|
| CN114135516A true CN114135516A (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111401021.0A Pending CN114135516A (en) | 2021-11-24 | 2021-11-24 | General centrifugal fan that can arrange fast |
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| CN (1) | CN114135516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013363A (en) * | 2022-07-06 | 2022-09-06 | 山东深博建筑工程有限公司 | Water pump installation foundation and water pump installation method |
-
2021
- 2021-11-24 CN CN202111401021.0A patent/CN114135516A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013363A (en) * | 2022-07-06 | 2022-09-06 | 山东深博建筑工程有限公司 | Water pump installation foundation and water pump installation method |
| CN115013363B (en) * | 2022-07-06 | 2023-05-05 | 山东深博建筑工程有限公司 | Water pump installation foundation and water pump installation method |
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