CN106151112B - Anti-stall device of axial flow fan and control method thereof - Google Patents
Anti-stall device of axial flow fan and control method thereof Download PDFInfo
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- CN106151112B CN106151112B CN201610752905.3A CN201610752905A CN106151112B CN 106151112 B CN106151112 B CN 106151112B CN 201610752905 A CN201610752905 A CN 201610752905A CN 106151112 B CN106151112 B CN 106151112B
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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
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/524—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps shiftable members for obturating part of the flow path
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/009—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by bleeding, by passing or recycling fluid
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Abstract
The invention relates to an anti-stall device of an axial flow fan and a control method thereof, wherein the anti-stall device of the axial flow fan comprises a fan barrel, the fan barrel is provided with a backflow region, the backflow region is arranged on the outer peripheral side of a front guide vane, the backflow region is provided with a plurality of circulation channels communicated with an inlet of the front guide vane, and the plurality of circulation channels are arranged at intervals along the circumferential direction of the backflow region; the rotatable partition plate is arranged between the circulating channel and the rotating blades of the fan, the partition plate can rotate relative to the barrel of the fan, and the partition plate is provided with a plurality of baffle blades which are arranged at intervals along the circumferential direction of the partition plate; the control mechanism is used for controlling the partition plate to rotate; and the pressure detection device is used for detecting the air pressure between the circulating channel and the rotating blade of the fan and is electrically connected with the control mechanism. The anti-stall device of the axial flow fan and the control method thereof can effectively prevent the axial flow fan from stalling and improve the running efficiency of the fan at the same time.
Description
Technical Field
The invention relates to the technical field of axial flow fans, in particular to an anti-stall device of an axial flow fan and a control method thereof.
Background
The axial flow fan is widely used on a large coal-fired unit due to the technical advantages of high efficiency, small rotor inertia and the like. However, the axial flow fan has a stall area, especially under a low-flow working condition, stall is easy to occur, certain risks are brought in operation, and the application range of the axial flow fan is limited.
The stall of the axial flow fan is the inherent hydrodynamic characteristic, and although the stall area can be reduced to a certain extent by changing the blade profile and the installation angle, the aerodynamic efficiency of the blade at the rated flow is reduced by the changes, and the reduction of the running efficiency of the fan is brought as a side effect.
Disclosure of Invention
Accordingly, there is a need for an anti-stall device for an axial flow fan and a control method thereof, which can effectively prevent the axial flow fan from stalling and improve the operating efficiency of the axial flow fan.
The technical scheme is as follows:
an anti-stall device of an axial flow fan comprises a fan barrel, wherein the fan barrel is provided with a backflow area, the backflow area is in a groove shape and is arranged on the outer peripheral side of a front guide vane, the backflow area is provided with a plurality of circulation channels communicated with an inlet of the front guide vane, the circulation channels are arranged on the outer peripheral side of the front guide vane at intervals along the circumferential direction of the backflow area, and the circulation channels and a fan rotating vane are arranged at intervals along the axial direction of a main shaft and are arranged towards the direction far away from an outlet of the fan barrel; the rotatable partition plate is arranged between the circulating channel and the rotating blades of the fan, the partition plate can rotate relative to the fan barrel, the partition plate is provided with a plurality of baffle blades which correspond to the circulating channels one by one, and the baffle blades are arranged at intervals along the circumferential direction of the partition plate; the partition plate is also provided with a plurality of through holes, and at least one through hole is arranged between two adjacent baffle blades; the control mechanism is used for controlling the partition plate to rotate; the pressure detection device is used for detecting the air pressure between the circulating channel and the rotating blade of the fan and is electrically connected with the control mechanism; wherein when the partition is in the first position, the baffle closes the inlet of the corresponding circulation channel; when the partition board is in the second position, the baffle blades are staggered with the inlets of the corresponding circulating channels, and the through holes are communicated with the inlets of the circulating channels.
The technical solution is further explained below:
in one embodiment, the outer periphery of the partition plate is in rolling or sliding friction fit with the inner wall of the blower cylinder.
In one embodiment, a plurality of the circulation channels are uniformly spaced along the circumferential direction of the backflow zone, and a plurality of the baffle blades are uniformly spaced along the circumferential side of the partition plate.
In one embodiment, the through holes and the stop blades are arranged along the same circumference in a staggered and spaced manner, and one through hole corresponds to an inlet of one circulation channel and one stop blade.
In one embodiment, the partition plate is provided with a sleeve hole which is in clearance fit with a main shaft of the fan rotating blade, a connecting rib is arranged between the sleeve hole and the baffle blade, and an arc-shaped part is arranged on one side, close to the front guide blade, of the connecting rib.
In one embodiment, the control mechanism comprises a soft connecting piece and a power mechanism for drawing the soft connecting piece, the partition board is provided with a connecting part connected with the soft connecting piece, and the control mechanism draws the soft connecting piece through the power mechanism to drive the partition board to rotate.
In one embodiment, the edge of the partition plate is rotatably sleeved on the blower barrel, the partition plate is provided with a driving part, and the control mechanism is provided with a first transmission assembly for controlling the driving part to rotate.
In one embodiment, the partition board is provided with a shifting sheet, one end of the shifting sheet is arranged outside the blower barrel, the blower barrel is provided with a guide groove in clearance fit with the shifting sheet, and the control mechanism is provided with a second transmission assembly for driving the shifting sheet to rotate.
In one embodiment, the partition board is provided with a limiting pin, and the inner wall of the blower barrel is provided with a limiting groove matched with the limiting pin.
In one embodiment, the anti-stall device of the axial flow fan further comprises a limit switch, the limit switch is used for detecting the position information of the partition plate, and the limit switch is electrically connected with the control mechanism.
The technical scheme also provides a control method of the anti-stall device of the axial flow fan, which is applied to the anti-stall device of the axial flow fan and comprises the following steps:
when the air pressure value detected by the pressure detection device is greater than or equal to a first preset value, the control mechanism controls the partition plate to rotate to a second position, and the circulating channel is opened;
when the air pressure value detected by the pressure detection device is smaller than or equal to a second preset value, the control mechanism controls the partition plate to rotate to the first position, and the circulating channel is closed.
The terms "first" and "second" in the present invention do not denote any particular quantity or order, but rather are used to distinguish one name from another.
The beneficial effects of the invention are as follows:
when the internal flow of the axial flow fan reaches 15% -35% of the total limit flow, the load stall critical pressure of the axial flow fan is lowest, and when the axial flow fan runs most dangerously, the fan barrel is provided with the backflow area, the backflow area is provided with the circulating channel, when the air pressure value detected by the pressure detection device is greater than or equal to a first preset value, the control mechanism controls the partition plate to rotate to a second position, the circulating channel is opened, the flow passing through the blades is increased, and the total output flow is unchanged; when the air pressure value detected by the pressure detection device is smaller than or equal to a second preset value, the control mechanism controls the partition plate to rotate to a first position, and the circulating channel is closed; the stall of the axial flow fan is avoided by controlling the opening and closing of the circulating channel through the rotatable partition plate, and the running stability of the axial flow fan is improved. The anti-stall device of the axial flow fan and the control method thereof can effectively prevent the axial flow fan from stalling, and simultaneously, the running efficiency of the fan under high load is not reduced.
Drawings
Fig. 1 is a schematic structural view of an anti-stall device of an axial flow fan according to the present invention;
FIG. 2 is a schematic view of a first position of the partition according to the present invention;
FIG. 3 is a schematic view of the partition according to the present invention in a second position;
fig. 4 is a schematic diagram of the fitting of the limit pin and the limit groove according to the present invention.
Description of reference numerals:
100. the fan comprises a fan cylinder body 102, an inlet 110, a backflow area 120, a circulation channel 130, a limiting groove 200, a partition plate 210, a baffle blade 220, a through hole 230, a trepanning 240, a connecting rib 250, a connecting part 260, a limiting pin 300, a control mechanism 310, a soft connecting piece 320, a power mechanism 330, a controller 400, a pressure detection device 500, a front guide vane 600, a fan rotating vane 610, a main shaft 700 and an outlet diffusion cylinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the anti-stall device for an axial flow fan according to the present invention includes: the fan cylinder 100 is provided with a backflow region 110, the backflow region 110 is arranged on the outer peripheral side of the front guide vane 500, the backflow region 110 is provided with a plurality of circulation channels 120 communicated with the inlet 102 of the front guide vane 500, and the circulation channels 120 are arranged at intervals along the circumferential direction of the backflow region 110; the partition plate 200 is rotatable, the partition plate 200 is arranged between the circulation channel 120 and the fan rotating blade 600, the partition plate 200 can rotate relative to the fan barrel 100, the partition plate 200 is provided with a plurality of baffle blades 210 which are in one-to-one correspondence with the circulation channels 120, and the baffle blades 210 are arranged at intervals along the circumferential direction of the partition plate 200; the control mechanism 300, the control mechanism 300 is used for controlling the baffle 200 to rotate; the pressure detection device 400 is used for detecting the air pressure between the circulating channel 120 and the fan rotating blade 600, and the pressure detection device 400 is electrically connected with the control mechanism 300; wherein, when the partition 200 is in the first position, the baffle 210 closes the inlet 102 of the circulation passage 120; when the partition 200 is in the second position, the stop 210 is offset from the inlet 102 of the circulation passage 120.
As shown in fig. 1 to 3, when the internal flow rate of the axial flow fan reaches 15% to 35% of the total limit flow rate, the load stall critical pressure of the axial flow fan is the lowest, and when the axial flow fan runs the most dangerous, the fan cylinder 100 is provided with the backflow region 110, and the backflow region 110 is provided with the circulation channel 120, when the air pressure value detected by the pressure detection device 400 is greater than or equal to the first preset value, the control mechanism 300 controls the partition board 200 to rotate to the second position, and opens the circulation channel 120; when the air pressure value detected by the pressure detection device 400 is less than or equal to the second preset value, the control mechanism 300 controls the partition board 200 to rotate to the first position, and the circulation channel 120 is closed; the rotating baffle plate 200 controls the opening and closing of the circulating channel 120 to avoid the stall of the axial flow fan and improve the stability of the operation of the axial flow fan, wherein the power required by the control mechanism 300 to control the rotation of the baffle plate 200 can be provided by manpower, a motor + transmission mechanism, a wind power + transmission mechanism or a water flow + transmission mechanism. The anti-stall device of the axial flow fan can effectively prevent the stall of the axial flow fan, and meanwhile, the running efficiency of the fan under high load is not reduced.
As shown in fig. 1 to 3, in the present embodiment, the outer peripheral side of the partition board 200 is in rolling or sliding friction fit with the inner wall of the blower cylinder 100, preferably, rolling friction is adopted, so that the friction force required to be overcome when the partition board 200 rotates can be reduced, preferably, the partition board 200 is connected with the blower cylinder 100 through a rolling bearing, so that rolling friction fit is achieved, and installation and maintenance thereof are facilitated.
As shown in fig. 1 to 3, in the present embodiment, the plurality of circulation passages 120 are uniformly spaced along the circumferential direction of the recirculation zone 110, and the plurality of baffle blades 210 are uniformly spaced along the circumferential side of the partition plate 200; therefore, all the circulation channels 120 can be ensured to be closed by the baffle blades, and meanwhile, the rotation angle of the partition plate 200 is convenient to control, so that the opening size of the circulation channels 120 can be regularly opened; the flap may cover the inlet 102 of the circulation channel 120 or seal the inlet 102 of the circulation channel 120. Further, the partition board 200 is further provided with a plurality of through holes 220, at least one through hole 220 is arranged between two adjacent baffle blades 210, and when the partition board 200 is located at the second position, the through hole 220 is communicated with the inlet 102 of the circulation channel 120, so that the opening, the opening size adjustment and the closing of the inlet 102 of the circulation channel 120 can be realized by changing the positions of the baffle blades of the partition board 200 and the through hole 220, the adjustment under various working conditions can be further met, and the operation of the axial flow fan is more stable and reliable. Still further, the through holes 220 and the blocking vanes 210 are staggered and spaced from each other along the same circumference, so that the size of the inlet 102 of the circulation channel 120 can be adjusted by rotating the partition plate 200, the structure of the partition plate 200 is simplified, the size of the inlet 102 of the circulation channel 120 can be adjusted by only repeatedly rotating along the same circle center, preferably, one through hole 220 corresponds to the inlet 102 of one circulation channel 120 and one blocking vane 210, and the shape of the through hole 220, the shape of the inlet 102 of the circulation channel 120 and the shape of the blocking vane are the same, so that the flow resistance is reduced, and the gas can be smoothly circulated. Still further, the partition board 200 is provided with a trepanning 230 in clearance fit with the main shaft 610 of the fan rotating blade 600, a connecting rib 240 is arranged between the trepanning 230 and the baffle blade 210, and an arc-shaped part is arranged on one side of the connecting rib 240 close to the front guide blade 500 and is of a streamline structure, so that the requirement of fluid mechanics is met, the resistance of gas movement is reduced as much as possible, and the formation of local vortex and the waste of energy are avoided.
It should be noted that, in the embodiment, the number and shape of the blocking blades, the through holes 220 and the circulation channels 120 of the partition board 200 (in the example, the number of the blocking blades, the number of the through holes 220 and the number of the channels are all 18) are not limited to the protection range, and as long as the blocking blades and the inlets 102 of the circulation channels 120 are mutually covered or staggered to close and open the inlets 102 of the circulation channels 120, the substance is the same as the scheme, and the protection range of the present invention is included; the number of the partition boards 200 is 1 to N groups, N is a natural number (for example, 2 groups), the larger the number of the adjustable partition boards 200 is, the smaller the angle of rotation is, only the number of the adjustable partition boards 200 is changed, and the method still belongs to the method of mutually covering or staggering to open or close the inlet 102 of the circulation channel 120, and the essence is the same as the present solution, and all belong to the protection scope of the present invention.
As shown in fig. 1 to 4, in the present embodiment, the control mechanism 300 includes a flexible connecting member 310 and a power mechanism 320 for pulling the flexible connecting member 310, the partition board 200 is provided with a connecting portion 250 connected to the flexible connecting member 310, and the control mechanism 300 pulls the flexible connecting member 310 through the power mechanism 320 to drive the partition board 200 to rotate, so that the rotation direction and angle of the partition board 200 are controlled by the cooperation of the flexible connecting member 310 and the power mechanism 320, and the flexible connecting member 310 may be a tensile cord such as a steel wire rope, a cable rope, or a chain rope, or a power connecting member such as a belt, a chain, or the like, preferably a tensile cord is used, thereby reducing the modification of the blower cylinder 100 and reducing other manufacturing requirements brought by the modification of the blower cylinder 100; various drive means and different force-transmitting devices may also be used: if the edge of the partition board 200 can be rotatably sleeved on the blower barrel 100, the partition board 200 is provided with a driving part (not shown), and the control mechanism 300 is provided with a first transmission assembly (not shown) for controlling the driving part to rotate; if the partition board 200 is provided with a shifting sheet (not shown), one end of the shifting sheet is arranged outside the blower barrel 100, the blower barrel 100 is provided with a guide groove (not shown) in clearance fit with the shifting sheet, and the control mechanism 300 is provided with a second transmission assembly (not shown) for driving the shifting sheet to rotate; or various combined control modes such as a push rod motor, a worm gear, chain transmission and the like. Further, the partition board 200 is provided with a limit pin 260, and the inner wall of the blower barrel 100 is provided with a limit groove 130 matched with the limit pin 260, so that the limit of the rotation angle of the partition board 200 can be realized through the matching of the limit pin 260 and the limit groove 130, and the partition board 200 can rotate within a preset rotation range through being matched with the control mechanism 300; the limiting groove 130 is an arc-shaped groove and is on the same axis with the partition board 200, so that the arc length required by the limiting groove 130 can be obtained only by knowing the rotation angle, so as to adapt to the control requirements of different axial flow fans. Still further, the anti-stall device of the axial flow fan further comprises a limit switch (not shown), the limit switch is used for detecting the position information of the partition board 200, and the limit switch is electrically connected with the control mechanism 300, so that the position information of the partition board 200 can be known in time, when the partition board 200 is at the first position or the partition board 200 is at the second position, the control mechanism 300 can conveniently perform corresponding output adjustment, the control mechanism 300 further comprises a controller 330 and a transmission mechanism, the controller 330 is electrically connected with the pressure detection device 400, the limit switch and the transmission mechanism, and the controller 330 is arranged to facilitate the setting of the rotation angle of the partition board 200 by an operator, so that the automation degree is improved, and the labor intensity is reduced; the limit switch can be a pressure switch, a displacement detection switch or a light large switch and the like; preferably, the limit switch is provided with two triggering parts which are in triggering fit with the limit pin 260, the two triggering parts are respectively arranged at two ends of the limit groove 130, the position of the partition board 200 is detected through the pressure change of the limit pin 260 and the limit groove 130, the control mechanism 300 can receive a corresponding signal generated by the triggering of the limit pin 260 and the triggering parts (not shown) to make corresponding adjustment, for example, when the triggering parts of the limit pin 260 and the first end of the limit groove 130 trigger, the limit switch sends the corresponding signal to the controller 330 of the control mechanism 300, the controller 330 of the control mechanism 300 judges that the partition board 200 is located at a first preset position according to the signal, and can reduce the torque output or stop the torque output; similarly, when the trigger portion of the second end of the limit pin 260 and the limit groove 130 is triggered, the limit switch sends a corresponding signal to the control mechanism 300, and the control mechanism 300 determines that the partition board 200 is located at the second preset position according to the signal, so that the torque output can be reduced or stopped.
As shown in fig. 1 to 3, the control method of the anti-stall device of the axial flow fan according to the present invention is applied to the anti-stall device of the axial flow fan, and includes the following steps:
when the air pressure value detected by the pressure detection device 400 is greater than or equal to the first preset value, the control mechanism 300 controls the partition board 200 to rotate to the second position, and the circulation channel 120 is opened;
when the air pressure detected by the pressure detecting device 400 is less than or equal to the second predetermined value, the control mechanism 300 controls the partition 200 to rotate to the first position, and closes the circulation passage 120.
When the internal flow of the axial flow fan reaches 15% -35% of the total flow, the load stall critical pressure of the axial flow fan is the lowest, and when the axial flow fan runs most dangerously, the backflow area 110 is arranged on the fan cylinder 100, the circulation channel 120 is arranged on the backflow area 110, and when the air pressure value detected by the pressure detection device 400 is greater than or equal to a first preset value, the control mechanism 300 controls the partition plate 200 to rotate to a second position, and the circulation channel 120 is opened; when the air pressure value detected by the pressure detection device 400 is less than or equal to the second preset value, the control mechanism 300 controls the partition board 200 to rotate to the first position, and the circulation channel 120 is closed; the rotating baffle 200 controls the opening and closing of the circulation channel 120 to avoid the stall of the axial flow fan and improve the operation stability of the axial flow fan. The control method of the anti-stall device of the axial flow fan can effectively prevent the axial flow fan from stalling, and meanwhile, the running efficiency of the fan under high load is not reduced.
It should be noted that the control mode of the partition board 200 is a two-position mode of "first position (off) -second position (on)" which can satisfy the use requirement, and the control mode can also be continuously adjustable, and both belong to the protection scope of the present invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. An anti-stall device for an axial flow fan, comprising:
the fan cylinder is provided with a backflow area, the backflow area is in a groove shape and is arranged on the outer peripheral side of a front guide vane, the backflow area is provided with a plurality of circulation channels communicated with an inlet of the front guide vane, the circulation channels are arranged on the outer peripheral side of the front guide vane at intervals along the circumferential direction of the backflow area, and the circulation channels and a fan rotating vane are arranged at intervals along the axial direction of a main shaft and are arranged towards the direction far away from an outlet of the fan cylinder;
the partition plate is arranged between the circulating channel and the fan rotating blades and can rotate relative to the fan barrel, the partition plate is provided with a plurality of baffle blades which correspond to the circulating channels one by one, and the baffle blades are arranged at intervals along the circumferential direction of the partition plate; the partition plate is also provided with a plurality of through holes, and at least one through hole is arranged between two adjacent baffle blades;
the control mechanism is used for controlling the partition plate to rotate; and
the pressure detection device is used for detecting the air pressure between the circulating channel and the rotating blade of the fan and is electrically connected with the control mechanism;
wherein when the partition is in the first position, the baffle closes the inlet of the corresponding circulation channel; when the partition board is in the second position, the baffle blades are staggered with the inlets of the corresponding circulating channels, and the through holes are communicated with the inlets of the circulating channels.
2. The stall prevention device of an axial flow fan according to claim 1, wherein an outer circumferential side of the partition plate is in rolling or sliding friction fit with an inner wall of the fan cylinder.
3. The stall prevention device of an axial flow fan according to claim 1, wherein a plurality of the circulation passages are provided at regular intervals in a circumferential direction of the backflow region, and a plurality of the barrier blades are provided at regular intervals in a circumferential direction of the partition plate.
4. The stall preventing device for an axial flow fan according to claim 1, wherein the plurality of through holes and the plurality of barrier blades are arranged at intervals in a staggered manner along the same circumference, and one through hole corresponds to an inlet of one of the circulation passages and one of the barrier blades.
5. The stall prevention device of an axial flow fan according to claim 1, wherein the partition plate is provided with a sleeve hole which is in clearance fit with a main shaft of the fan rotating blade, a connecting rib is arranged between the sleeve hole and the baffle blade, and an arc-shaped part is arranged on one side of the connecting rib close to the front guide blade.
6. The anti-stall device of an axial flow fan according to claim 1, wherein the control mechanism comprises a soft connecting piece and a power mechanism for drawing the soft connecting piece, the partition board is provided with a connecting part connected with the soft connecting piece, and the control mechanism draws the soft connecting piece to drive the partition board to rotate through the power mechanism.
7. The stall prevention device of an axial flow fan according to claim 1, wherein an edge of the partition plate is rotatably sleeved on the fan cylinder, the partition plate is provided with a driving portion, and the control mechanism is provided with a first transmission assembly for controlling the driving portion to rotate.
8. The stall prevention device for the axial flow fan according to claim 1, wherein the partition plate is provided with a shifting piece, one end of the shifting piece is arranged outside the fan cylinder, the fan cylinder is provided with a guide groove in clearance fit with the shifting piece, and the control mechanism is provided with a second transmission assembly for driving the shifting piece to rotate.
9. The anti-stall device of an axial flow fan according to any one of claims 1 to 8, wherein the partition plate is provided with a limit pin, and the inner wall of the fan cylinder is provided with a limit groove matched with the limit pin.
10. The anti-stall device of an axial flow fan according to any one of claims 1 to 8, further comprising a limit switch for detecting position information of the partition plate, the limit switch being electrically coupled to the control mechanism.
11. A control method of an anti-stall device for an axial flow fan, applied to the anti-stall device for an axial flow fan according to any one of claims 1 to 10, comprising the steps of:
when the air pressure value detected by the pressure detection device is greater than or equal to a first preset value, the control mechanism controls the partition plate to rotate to a second position, and the circulating channel is opened;
when the air pressure value detected by the pressure detection device is smaller than or equal to a second preset value, the control mechanism controls the partition plate to rotate to the first position, and the circulating channel is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610752905.3A CN106151112B (en) | 2016-08-29 | 2016-08-29 | Anti-stall device of axial flow fan and control method thereof |
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| CN201610752905.3A CN106151112B (en) | 2016-08-29 | 2016-08-29 | Anti-stall device of axial flow fan and control method thereof |
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| CN106151112B true CN106151112B (en) | 2020-02-18 |
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| JPH03160198A (en) * | 1989-11-15 | 1991-07-10 | Hitachi Ltd | Casing treatment device for fluid machine |
| CN2230370Y (en) * | 1994-11-23 | 1996-07-03 | 电力工业部西安热工研究所 | Stall-proof device for axial-flow fan |
| CN2416263Y (en) * | 2000-03-06 | 2001-01-24 | 中国科学院工程热物理研究所 | Low-noise axial fan |
| CN2448968Y (en) * | 2000-11-08 | 2001-09-19 | 南通市同济申海大型风机有限公司 | Vibration-proof reservible axial-flow blower fan |
| CN1646790A (en) * | 2002-02-28 | 2005-07-27 | Mtu飞机发动机有限公司 | Recirculation structure for turbo chargers |
| CN102428282A (en) * | 2009-10-16 | 2012-04-25 | 三菱重工业株式会社 | Compressor for exhaust turbo-charger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3872966B2 (en) * | 2001-06-29 | 2007-01-24 | 株式会社日立プラントテクノロジー | Axial fluid machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03160198A (en) * | 1989-11-15 | 1991-07-10 | Hitachi Ltd | Casing treatment device for fluid machine |
| CN2230370Y (en) * | 1994-11-23 | 1996-07-03 | 电力工业部西安热工研究所 | Stall-proof device for axial-flow fan |
| CN2416263Y (en) * | 2000-03-06 | 2001-01-24 | 中国科学院工程热物理研究所 | Low-noise axial fan |
| CN2448968Y (en) * | 2000-11-08 | 2001-09-19 | 南通市同济申海大型风机有限公司 | Vibration-proof reservible axial-flow blower fan |
| CN1646790A (en) * | 2002-02-28 | 2005-07-27 | Mtu飞机发动机有限公司 | Recirculation structure for turbo chargers |
| CN102428282A (en) * | 2009-10-16 | 2012-04-25 | 三菱重工业株式会社 | Compressor for exhaust turbo-charger |
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|---|---|
| CN106151112A (en) | 2016-11-23 |
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