CN111237231B - Operation monitoring method of axial flow fan with adjustable moving blades - Google Patents
Operation monitoring method of axial flow fan with adjustable moving blades Download PDFInfo
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- CN111237231B CN111237231B CN202010057994.6A CN202010057994A CN111237231B CN 111237231 B CN111237231 B CN 111237231B CN 202010057994 A CN202010057994 A CN 202010057994A CN 111237231 B CN111237231 B CN 111237231B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 63
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 7
- 241000886569 Cyprogenia stegaria Species 0.000 claims description 6
- 241000883990 Flabellum Species 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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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
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
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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
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- 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
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially adapted for elastic fluid pumps
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/34—Blade mountings
- F04D29/36—Blade mountings adjustable
- F04D29/362—Blade mountings adjustable during rotation
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses an operation monitoring method of an axial flow fan with an adjustable movable blade, which comprises the following steps of: detecting the blades by using stall and surge detection equipment in the fan, adjusting the blades to a proper angle to avoid stall when the stall is detected, clamping the fan when the surge is detected, and then manually maintaining; the EPLD/CPLD device detects the pulse frequency output by the movable blade adjustable axial flow fan; the central processing unit judges whether the pulse frequency value is zero or not, and if the pulse frequency value is zero, the movable blade adjustable axial flow fan is judged to be stopped rotating; if the pulse frequency value is not zero, comparing the detected pulse frequency with a set threshold value; and if the rotating speed of the movable blade adjustable axial flow fan is reduced as a result of the comparison, continuously counting the rotating speed abnormity of the movable blade adjustable axial flow fan, and controlling the operation of the movable blade adjustable axial flow fan by the movable blade adjustable axial flow fan control circuit after the number of times exceeds a set threshold value.
Description
Technical Field
The invention belongs to the field of fans, and particularly relates to an operation monitoring method of an axial flow fan with adjustable moving blades.
Background
The centrifugal fan is a machine which can improve the gas pressure and discharge gas by means of input mechanical energy, and is a driven fluid machine, and is used for ventilating and inducing air of boilers and industrial furnaces, and the problems of stall and surge often occur in the existing movable blade adjustable axial flow fan, so that the service life of the fan is shortened, and the fan needs to be maintained or replaced earlier.
Disclosure of Invention
The invention provides an operation monitoring method of a movable blade adjustable axial flow fan, which can detect whether the fan blade stalls or surges in time in order to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for monitoring the operation of axial-flow fan with adjustable moving blades includes such steps as providing a monitoring unit,
a. stall and surge detection: detecting the blades by using stall and surge detection equipment in the fan, adjusting the blades to a proper angle to avoid stall when the stall is detected, clamping the fan when the surge is detected, and then manually maintaining;
b. the EPLD/CPLD device detects the pulse frequency output by the movable blade adjustable axial flow fan;
c. the central processing unit judges whether the pulse frequency value is zero or not;
d. if the pulse frequency value is zero, judging that the movable blade adjustable axial flow fan stops rotating;
e. if the pulse frequency value is not zero, comparing the detected pulse frequency with a set threshold value;
f. and if the rotating speed of the movable blade adjustable axial flow fan is reduced as a result of the comparison, continuously counting the rotating speed abnormity of the movable blade adjustable axial flow fan, and controlling the operation of the movable blade adjustable axial flow fan by the movable blade adjustable axial flow fan control circuit after the counting frequency exceeds a set threshold value.
The axial flow fan with the adjustable movable blades is divided into an axial flow fan shell, a ventilating duct communicated with the upper side of the axial flow fan shell, a fan space used for being arranged in the axial flow fan shell, a motor fixedly arranged on the left end wall of the fan space, a disc sleeved on the output end of the motor in a rotation stopping manner, a working shell fixedly arranged on the output end of the motor, a working space arranged in the working shell, a plurality of round holes arranged on the outer surface of the working space in the circumferential direction, a rotating shaft arranged in the round holes in a rotating manner, and fan blades fixedly arranged at the upper end of the rotating shaft.
The stall and surge detection device in the step a comprises a regulating device for automatically regulating the stall of the fan and a heat dissipation device for dissipating heat of the fan; the adjusting device comprises a pull rod rotatably arranged at the lower end of the rotating shaft, a plurality of trapezoidal grooves arranged on the outer surface of the disc in the circumferential direction, a trapezoidal block fixedly arranged at the lower end of the pull rod and arranged in the trapezoidal grooves in a manner of moving back and forth, an annular sleeve fixedly arranged on the right end face of the disc and an adjusting assembly;
the step of utilizing stall and surge check out test set to detect adjustable axial fan is as follows, and the motor starts to drive a plurality of flabellums rotatory, can lead to wind-force grow when the stall to drive adjusting part and start, let the fan adjust to normal scope, adjusting part can stop the fan card when too big unable adjustment of wind-force reaches normal scope.
In the step b, the pulse frequency is detected by the following method: counting pulse signals output by the movable blade adjustable axial flow fan within a preset time period; the pulse frequency is calculated using the following formula: and the pulse frequency value of the movable blade adjustable axial flow fan is equal to the threshold value of a pulse counter value/timer.
The step f of controlling the operation of the movable blade adjustable axial flow fan comprises the following steps: and performing fault alarm and/or enabling other movable blade adjustable axial flow fans on cooling object equipment of the movable blade adjustable axial flow fan with the fault to run at full speed.
The adjusting component comprises a fixed plate fixedly arranged on the inner wall of the fan space, a first transmission shaft rotationally arranged on the left end surface of the fixed plate, a rotating fan fixedly arranged on the outer surface of the first transmission shaft, a first belt wheel fixedly arranged on the outer surface of the first transmission shaft, a hollow shaft rotationally arranged on the left end surface of the fixed plate, a second belt wheel fixedly arranged on the left end of the hollow shaft, a first belt in transmission connection between the first belt wheel and the second belt wheel, and a threaded rod in threaded connection with the inner wall of the hollow shaft, the rotary shaft is rotatably arranged at the left end of the threaded rod, the straight rod is hinged between the annular sleeve and the rotary shaft, the first bevel gear is rotatably arranged on the outer surface of the hollow shaft, the long plate is fixedly arranged at the lower end of the fixed plate, the rotary hole is formed in the long plate, the rotary shaft is rotatably arranged in the rotary hole, and the two second bevel gears are respectively fixedly arranged on the upper side and the lower side of the rotary shaft;
the step of utilizing the adjusting component to adjust the adjustable axial flow fan of movable vane is as follows, drives the rotating fan rotatory when the wind-force of fan is too big, and the rotating fan drives first band pulley rotatory, and first band pulley drives the second band pulley rotatory, drives the pivot through threaded connection and moves right, and the pivot drives the disc and moves right, drives the pull rod rotation to drive the flabellum rotatory, thereby can make the blade speed adjustment of stall to normal range.
The heat dissipation device comprises a circular groove arranged on the right end wall of the working space, a sealing circular sliding block rotatably arranged in the circular groove, a supporting long plate fixedly arranged on the upper side of the inner wall of the fan space, a second transmission shaft rotatably arranged on the left end surface of the supporting long plate, a rotating fan fixedly arranged at the left end of the second transmission shaft, a third belt wheel fixedly arranged on the outer surface of the second transmission shaft, a support plate fixedly arranged at the lower end of the supporting long plate, a cylindrical shell fixedly arranged at the left end of the support plate, a cylindrical space arranged in the cylindrical shell, a third transmission shaft rotatably arranged on the left end surface of the supporting long plate, a partition plate fixedly arranged on the inner wall of the cylindrical space, a rectangular groove arranged on the partition plate, a rotating circular block fixedly arranged on the third transmission shaft, three grooves respectively arranged on the outer surface of the rotating circular block in the circumferential direction, and a fourth belt wheel fixedly arranged on the second transmission shaft, The second belt is in transmission connection with the third belt pulley and the fourth belt pulley, the fourth transmission shaft is rotatably arranged on the left end face of the support long plate, the fifth belt pulley is fixedly arranged on the outer surface of the fourth transmission shaft, the sixth belt pulley is fixedly arranged on the outer surface of the third transmission shaft, the third belt is in transmission connection with the fifth belt pulley and the sixth belt pulley, the first rotary bevel gear is fixedly arranged at the left end of the fourth transmission shaft, the transmission hole is formed in the rear side of the inner wall of the cylindrical space, the fifth transmission shaft is rotatably arranged in the transmission hole, the second rotary bevel gear is fixedly arranged at the end of the fifth transmission shaft, the rotary fan is fixedly arranged at the front end of the fifth transmission shaft, a plurality of through holes are formed in the rotary fan, and the upper side and the lower side between the cylindrical shell and the sealing ring sliding block are respectively communicated with two conveying pipes;
utilize heat abstractor to carry out the step of adjusting to the adjustable axial fan of movable vane as follows, it is rotatory that a plurality of flabellums are rotatory to drive the rotation fan, it is rotatory that the rotation fan drives the third band pulley, the third band pulley drives the fourth band pulley rotation, the fourth band pulley drives rotatory round block rotation, thereby can let oil get into the recess, when the oil that gets into the recess changes to the baffle top, oil in the recess can fall on the baffle, the fifth band pulley drives first rotatory bevel gear rotatory simultaneously, first rotatory bevel gear drives the rotation of second rotatory bevel gear, the rotation of second rotatory bevel gear drive rotation fan.
In summary, the invention has the following advantages: the method is simple to use, and can detect the problems of surge and stall of the fan in time, so that the service life of the fan can be prolonged by adjusting as early as possible.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a sectional perspective view taken along line a-a of fig. 2.
Fig. 4 is a sectional perspective view taken along line B-B of fig. 2.
Fig. 5 is an enlarged view at C in fig. 4.
Fig. 6 is an enlarged view at D in fig. 4.
Fig. 7 is an enlarged view at E in fig. 4.
Fig. 8 is an enlarged view at F in fig. 4.
Fig. 9 is an enlarged view at G in fig. 4.
Fig. 10 is an enlarged view at H in fig. 9.
Fig. 11 is a sectional perspective view taken along line I-I in fig. 2.
Fig. 12 is an enlarged view at J in fig. 11.
Fig. 13 is a cross-sectional perspective view taken along line B-B of fig. 12.
Fig. 14 is an enlarged view at K in fig. 13.
Fig. 15 is a cross-sectional view of a heat sink.
Detailed Description
In order to achieve the purpose, the invention adopts the following technical scheme: a method for monitoring the operation of axial-flow fan with adjustable moving blades includes such steps as providing a monitoring unit,
a. stall and surge detection: detecting the blades by using stall and surge detection equipment in the fan, adjusting the blades to a proper angle to avoid stall when the stall is detected, clamping the fan when the surge is detected, and then manually maintaining;
b. the EPLD/CPLD device detects the pulse frequency output by the movable blade adjustable axial flow fan;
c. the central processing unit judges whether the pulse frequency value is zero or not;
d. if the pulse frequency value is zero, judging that the movable blade adjustable axial flow fan stops rotating;
e. if the pulse frequency value is not zero, comparing the detected pulse frequency with a set threshold value;
f. and if the rotating speed of the movable blade adjustable axial flow fan is reduced as a result of the comparison, continuously counting the rotating speed abnormity of the movable blade adjustable axial flow fan, and controlling the operation of the movable blade adjustable axial flow fan by the movable blade adjustable axial flow fan control circuit after the counting frequency exceeds a set threshold value.
The step of utilizing stall and surge check out test set to detect adjustable axial fan is as follows, and the motor starts to drive a plurality of flabellums rotatory, can lead to wind-force grow when the stall to drive adjusting part and start, let the fan adjust to normal scope, adjusting part can stop the fan card when too big unable adjustment of wind-force reaches normal scope.
In the step b, the pulse frequency is detected by the following method: counting pulse signals output by the movable blade adjustable axial flow fan within a preset time period; the pulse frequency is calculated using the following formula: and the pulse frequency value of the movable blade adjustable axial flow fan is equal to the threshold value of a pulse counter value/timer.
The step f of controlling the operation of the movable blade adjustable axial flow fan comprises the following steps: and performing fault alarm and/or enabling other movable blade adjustable axial flow fans on cooling object equipment of the movable blade adjustable axial flow fan with the fault to run at full speed.
As shown in fig. 1 to 15, the movable blade adjustable axial flow fan is divided into an axial flow fan housing 1, a ventilation duct 92 communicating with the upper side of the axial flow fan housing 1, a fan space for being disposed in the axial flow fan housing 1, a motor fixedly disposed on the left end wall of the fan space, a disc 2 sleeved on the output end of the motor in a rotation stopping manner, a working housing 3 fixedly disposed on the output end of the motor, a working space disposed in the working housing 3, a plurality of circular holes circumferentially disposed on the outer surface of the working space, a rotating shaft rotatably disposed in the circular holes, and fan blades 4 fixedly disposed on the upper end of the rotating shaft.
The stall and surge detection device in the step a comprises a regulating device for automatically regulating the stall of the fan and a heat dissipation device for dissipating heat of the fan.
The adjusting device comprises a pull rod 5 rotatably arranged at the lower end of a rotating shaft, a plurality of trapezoidal grooves arranged on the outer surface of a disc 2 in the circumferential direction, a trapezoidal block fixedly arranged at the lower end of the pull rod 5 and arranged in the trapezoidal grooves in a back-and-forth moving manner, an annular sleeve 6 fixedly arranged on the right end surface of the disc 2, three adjusting components arranged on the inner wall of a fan space in the circumferential direction, a supporting column 507 fixedly arranged on the rear side of the inner wall of the fan space, a rotating supporting shaft 508 rotatably arranged at the left end of the supporting column 507, a connecting shaft 509 rotatably arranged at the left end of the rotating supporting shaft 508, a threaded pipe 510 sleeved on the outer surface of the connecting shaft 509, a cylindrical sleeve 511 in threaded connection with the outer surface of the threaded pipe 510, and a rotating bevel gear 512 fixedly arranged on the outer surface of the cylindrical sleeve 511, wherein the threaded pipe 510 is fixedly connected with the rear side of the inner wall of the fan space through a long rod, and the inner wall of the cylindrical sleeve 511 is a conical hole, the section of the connecting shaft 509 matched with the conical sleeve 511 is a conical shaft.
The adjusting component comprises a fixing plate 7 fixedly arranged on the inner wall of the fan space, a first transmission shaft 8 rotatably arranged on the left end face of the fixing plate 7, a rotating fan 9 fixedly arranged on the outer surface of the first transmission shaft 8, a first belt wheel 10 fixedly arranged on the outer surface of the first transmission shaft 8, a hollow shaft 11 rotatably arranged on the left end face of the fixing plate 7, a second belt wheel 12 fixedly arranged on the left end of the hollow shaft 11, a first belt 13 in transmission connection between the first belt wheel 10 and the second belt wheel 12, a threaded rod 713 in threaded connection with the inner wall of the hollow shaft 11, a rotating shaft 14 rotatably arranged on the left end of the threaded rod 713, a straight rod 15 hinged between the annular sleeve and the rotating shaft 14, a first bevel gear 16 rotatably arranged on the outer surface of the hollow shaft 11, a long plate 17 fixedly arranged at the lower end of the fixing plate 7, a rotating hole arranged on the long plate 17, a rotating shaft 18 rotatably arranged in the rotating hole, a rotating shaft, Two second bevel gears 19 fixedly provided on the upper and lower sides of the rotary shaft 18, respectively; the motor is started to drive the fan blades 4 to rotate, when the fan stalls, wind power is increased, so that the rotating fan 9 is driven to rotate, the rotating fan 9 drives the first belt wheel 10 to rotate, the first belt wheel 10 drives the second belt wheel 12 to rotate, the rotating shaft 14 is driven to move rightwards through threaded connection, the rotating shaft 14 drives the disc 2 to move rightwards, the pull rod 5 is driven to rotate, so that the fan blades are driven to rotate, the speed of the stalled blades can be adjusted to a normal range, the rotating fan 9 stops rotating, the blades can be adjusted in time when the fan stalls, the blades are prevented from being damaged due to continuous rotation under the condition of stalling, the service life of the blades is shortened, meanwhile, the second belt wheel 12 drives the first bevel gear 16 to rotate, when the fan still is in the stalled state after a plurality of turns, the first bevel gear 16 drives the second bevel gear 19, the second bevel gear 19 on the upper side drives the second bevel gear 19 on the lower side to rotate, and the second bevel gear 19 drives the rotating bevel gear to rotate for a plurality of circles, and then drives the cylindrical sleeve 511 to gradually move leftwards through threaded connection, so that the conical shaft can be clamped through the conical hole, the friction between the conical hole and the conical sleeve is increased, the motor can be stopped under overload protection, the effect of protecting the blades is achieved, and the problem that the blades are damaged due to the fact that the blades continuously run under the condition of surging is avoided; the second pulley 12 rotates the first bevel gear 16 by friction, so that the first bevel gear 16 rotates slower than the second pulley 12.
The heat dissipation device comprises an annular groove arranged on the right end wall of the working space, a sealing annular sliding block 20 rotatably arranged in the annular groove, a supporting long plate 21 fixedly arranged on the upper side of the inner wall of the fan space, a second transmission shaft 22 rotatably arranged on the left end surface of the supporting long plate 21, a rotating fan 23 fixedly arranged at the left end of the second transmission shaft 22, a third belt wheel 24 fixedly arranged on the outer surface of the second transmission shaft 22, a support plate 26 fixedly arranged at the lower end of the supporting long plate 21, a cylindrical shell 27 fixedly arranged at the left end of the support plate 26, a cylindrical space arranged in the cylindrical shell 27, a third transmission shaft 28 rotatably arranged on the left end surface of the supporting long plate 21, a partition plate 29 fixedly arranged on the inner wall of the cylindrical space, a rectangular groove arranged on the partition plate 29, a rotating round block 30 fixedly arranged on the third transmission shaft 28, and three grooves respectively arranged on the outer surface of the rotating round block 30 in the circumferential direction, A fourth belt wheel 40 fixedly arranged on the second transmission shaft 22, a second belt 41 in transmission connection between the third belt wheel 24 and the fourth belt wheel 40, a fourth transmission shaft 31 rotatably arranged on the left end surface of the support long plate 21, a fifth belt wheel 42 fixedly arranged on the outer surface of the fourth transmission shaft 31, a sixth belt wheel 43 fixedly arranged on the outer surface of the third transmission shaft 28, a third belt 44 in transmission connection between the fifth belt wheel 42 and the sixth belt wheel 43, a first rotary bevel gear 45 fixedly arranged on the left end of the fourth transmission shaft 31, a transmission hole arranged on the rear side of the inner wall of the cylindrical space, a fifth transmission shaft 46 rotatably arranged in the transmission hole, a second rotary bevel gear 47 fixedly arranged on the rear end of the fifth transmission shaft 46, a rotating fan 48 fixedly arranged on the front end of the fifth transmission shaft 46, and a plurality of through holes arranged on the rotating fan 48, the upper side and the lower side between the cylindrical shell 27 and the sealing circular sliding block 20 are respectively communicated with two conveying pipes 701; the rotation of the fan blades drives the rotating fan 23 to rotate, the rotating fan 23 drives the third belt wheel 24 to rotate, the third belt wheel 24 drives the fourth belt wheel 40 to rotate, the fourth belt wheel 40 drives the rotating round block 30 to rotate, so that the oil can enter the groove, when the oil entering the groove turns to the upper part of the clapboard, the oil in the groove can fall onto the clapboard, meanwhile, the fifth belt wheel 42 drives the first rotary bevel gear 45 to rotate, the first rotary bevel gear 45 drives the second rotary bevel gear 47 to rotate, the second rotary bevel gear 47 drives the rotary fan 48 to rotate, so that the oil thrown out by the centrifugal force generated by the rotation of the rotary disk 30 can be brought into contact with the rotating fan 48 in rotation, so that the oil is scattered by the rotating fan 48 when it is scattered on the partition, thereby increasing the heat radiating area of the oil, therefore, the oil absorbing the heat energy of the fan can possibly dissipate the heat, and the oil can return to the working space through the conveying pipe on the upper side to continuously dissipate the heat of the fan; by rotating the fan 48 with a plurality of holes, a part of the oil passing through the holes can be divided into a plurality of downward flows, so that the heat dissipation area of the oil can be further increased, and the oil can be dissipated more quickly.
The working principle is as follows: the step of utilizing stall and surge check out test set to detect adjustable axial fan is as follows, and the motor starts to drive a plurality of flabellums rotatory, can lead to wind-force grow when the stall to drive adjusting part and start, let the fan adjust to normal scope, adjusting part can stop the fan card when too big unable adjustment of wind-force reaches normal scope.
Claims (1)
1. A method for monitoring the operation of axial-flow fan with adjustable moving blades includes such steps as providing a monitoring unit,
a. stall and surge detection: detecting the blades by using stall and surge detection equipment in the fan, adjusting the blades to a proper angle to avoid stall when the stall is detected, clamping the fan when the surge is detected, and then manually maintaining;
b. the EPLD/CPLD device detects the pulse frequency output by the movable blade adjustable axial flow fan;
c. the central processing unit judges whether the pulse frequency value is zero or not;
d. if the pulse frequency value is zero, judging that the movable blade adjustable axial flow fan stops rotating;
e. if the pulse frequency value is not zero, comparing the detected pulse frequency with a set threshold value;
f. if the rotating speed of the movable blade adjustable axial flow fan is reduced as a result of the comparison, continuously counting the rotating speed abnormity of the movable blade adjustable axial flow fan, and controlling the operation of the movable blade adjustable axial flow fan by a movable blade adjustable axial flow fan control circuit after the counting frequency exceeds a set threshold value;
the movable blade adjustable axial flow fan is divided into an axial flow fan shell (1), a ventilating duct (92) communicated with the upper side of the axial flow fan shell (1), a fan space arranged in the axial flow fan shell (1), a motor fixedly arranged on the left end wall of the fan space, a disc (2) sleeved at the output end of the motor in a rotation stopping manner, a working shell (3) fixedly arranged at the output end of the motor, a working space arranged in the working shell (3), a plurality of round holes arranged on the outer surface of the working space in the circumferential direction, a rotating shaft rotatably arranged in the round holes, and fan blades (4) fixedly arranged at the upper end of the rotating shaft;
the stall and surge detection device in the step a comprises a regulating device for automatically regulating the stall of the fan and a heat dissipation device for dissipating heat of the fan; the adjusting device comprises a pull rod (5) rotatably arranged at the lower end of the rotating shaft, a plurality of trapezoidal grooves arranged on the outer surface of the disc (2) in the circumferential direction, a trapezoidal block fixedly arranged at the lower end of the pull rod (5) and arranged in the trapezoidal grooves in a back-and-forth moving manner, an annular sleeve (6) fixedly arranged on the right end face of the disc (2), and an adjusting assembly;
the method for detecting the adjustable axial flow fan by using the stall and surge detection equipment comprises the following steps that a motor is started to drive a plurality of fan blades (4) to rotate, wind power is increased when stall occurs, so that an adjusting assembly is driven to start, the fan is adjusted to a normal range, and the fan is blocked and stopped by the adjusting assembly when wind power is too large and cannot be adjusted to the normal range;
in the step b, the pulse frequency is detected by the following method: counting pulse signals output by the movable blade adjustable axial flow fan within a preset time period; the pulse frequency is calculated using the following formula: the pulse frequency value of the movable blade adjustable axial flow fan is equal to the value of a pulse counter/the threshold value of a timer;
the step f of controlling the operation of the movable blade adjustable axial flow fan comprises the following steps: performing fault alarm and/or enabling other movable blade adjustable axial flow fans on cooling object equipment of the movable blade adjustable axial flow fan with the fault to run at full speed;
the adjusting assembly comprises a fixing plate (7) fixedly arranged on the inner wall of the fan space, a first transmission shaft (8) rotatably arranged on the left end face of the fixing plate (7), a rotating fan (9) fixedly arranged on the outer surface of the first transmission shaft (8), a first belt wheel (10) fixedly arranged on the outer surface of the first transmission shaft (8), a hollow shaft (11) rotatably arranged on the left end face of the fixing plate (7), a second belt wheel (12) fixedly arranged on the left end of the hollow shaft (11), a first belt (13) in transmission connection between the first belt wheel (10) and the second belt wheel (12), a threaded rod (713) in threaded connection with the inner wall of the hollow shaft (11), a rotating shaft (14) rotatably arranged on the left end of the threaded rod (713), a straight rod (15) hinged between an annular sleeve and the rotating shaft (14), and a first bevel gear (16) rotatably arranged on the outer surface of the hollow shaft (11), A long plate (17) fixedly arranged at the lower end of the fixed plate (7), a rotary hole arranged on the long plate (17), a rotary shaft (18) rotatably arranged in the rotary hole, and two second bevel gears (19) fixedly arranged on the upper side and the lower side of the rotary shaft (18) respectively;
the axial flow fan with the adjustable movable blades is adjusted by using the adjusting assembly, when the wind power of the fan is too large, the rotating fan (9) is driven to rotate, the rotating fan (9) drives the first belt wheel (10) to rotate, the first belt wheel (10) drives the second belt wheel (12) to rotate, the rotating shaft (14) is driven to move rightwards through threaded connection, the rotating shaft (14) drives the disc (2) to move rightwards, the pull rod (5) is driven to rotate, and therefore the blades are driven to rotate, and the speed of the stalled blades can be adjusted to a normal range;
the heat dissipation device comprises a circular groove arranged on the right end wall of a working space, a sealing circular sliding block (20) rotatably arranged in the circular groove, a long supporting plate (21) fixedly arranged on the upper side of the inner wall of a fan space, a second transmission shaft (22) rotatably arranged on the left end face of the long supporting plate (21), a rotating fan (23) fixedly arranged at the left end of the second transmission shaft (22), a third belt wheel (24) fixedly arranged on the outer surface of the second transmission shaft (22), a supporting plate (26) fixedly arranged at the lower end of the long supporting plate (21), a cylindrical shell (27) fixedly arranged at the left end of the supporting plate (26), a cylindrical space arranged in the cylindrical shell (27), a third transmission shaft (28) rotatably arranged on the left end face of the long supporting plate (21), a partition plate (29) fixedly arranged on the inner wall of the cylindrical space, a rectangular groove arranged on the partition plate (29), a rotating circular block (30) fixedly arranged on the third transmission shaft (28), Three grooves which are respectively arranged on the outer surface of the rotary round block (30) in the circumferential direction, a fourth belt wheel (40) which is fixedly arranged on a third transmission shaft (28), a second belt (41) which is in transmission connection between the third belt wheel (24) and the fourth belt wheel (40), a fourth transmission shaft (31) which is rotatably arranged on the left end surface of the support long plate (21), a fifth belt wheel (42) which is fixedly arranged on the outer surface of the fourth transmission shaft (31), a sixth belt wheel (43) which is fixedly arranged on the outer surface of the second transmission shaft (22), a third belt (44) which is in transmission connection between the fifth belt wheel (42) and the sixth belt wheel (43), a first rotary bevel gear (45) which is fixedly arranged at the left end of the fourth transmission shaft (31), a transmission hole which is arranged at the rear side of the inner wall of the cylindrical space, a fifth transmission shaft (46) which is rotatably arranged in the transmission hole, a second rotary bevel gear (47) which is fixedly arranged at the rear end of the fifth transmission shaft (46), and a second rotary bevel gear (47), The rotating fan (48) is fixedly arranged at the front end of the fifth transmission shaft (46), the through holes are formed in the rotating fan (48), and the upper side and the lower side between the cylindrical shell (27) and the sealing circular ring sliding block (20) are respectively communicated with two conveying pipes (701);
utilize heat abstractor to carry out radiating step as follows to the adjustable axial fan of movable vane, a plurality of flabellums are rotatory to be driven and to rotate fan (23), it is rotatory to rotate fan (23) and drive third band pulley (24), third band pulley (24) drive fourth band pulley (40) are rotatory, fourth band pulley (40) drive rotatory boss (30) are rotatory, thereby can let oil get into the recess, when the oil that gets into the recess changes to the baffle top, oil in the recess can fall on the baffle, fifth band pulley (42) drive first rotatory bevel gear (45) rotatory simultaneously, first rotatory bevel gear (45) drive second rotatory bevel gear (47) rotatory, second rotatory bevel gear (47) drive and rotate fan (48) rotatory.
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| CN202010057994.6A CN111237231B (en) | 2020-01-19 | 2020-01-19 | Operation monitoring method of axial flow fan with adjustable moving blades |
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| CN112594864B (en) * | 2020-11-17 | 2022-05-17 | 珠海格力电器股份有限公司 | Control method for surge judgment and optimization, controller, cross-flow fan and air conditioner |
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| CN205559343U (en) * | 2016-04-18 | 2016-09-07 | 河北骞海鼓风机有限公司 | Prevent differential pressure switch device of blade stall |
| CN206860496U (en) * | 2017-05-04 | 2018-01-09 | 广州市广鼎机械设备有限公司 | A kind of energy-saving industrial ceiling fan |
| CN110594186A (en) * | 2019-10-30 | 2019-12-20 | 浙江上风高科专风实业有限公司 | Operation monitoring method of axial flow fan with adjustable moving blades |
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| JPH10252691A (en) * | 1997-03-14 | 1998-09-22 | Hitachi Ltd | Moving blade variable axial fan and method of operating the same |
| CN1525073A (en) * | 2003-02-26 | 2004-09-01 | 华为技术有限公司 | A method for monitoring fan operation |
| CN102803736A (en) * | 2009-06-05 | 2012-11-28 | 江森自控科技公司 | Control system |
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