CN212508888U - Lightweight axial flow cooling fan of alternating current transmission locomotive - Google Patents

Abstract

The utility model provides a light axial flow cooling fan of an AC transmission locomotive, which comprises a main ventilation duct, a non-metal axial flow impeller, a multi-pole driving motor and a frequency converter combination, and can realize the system integration frequency conversion speed regulation control and light weight; the main air duct includes: the air conditioner comprises a mounting flange, an outer air duct, a front arc-shaped fixed blade, a flow guide hemisphere, an inner air duct and an arc-shaped flow guide fixed blade; the non-metal axial flow impeller comprises wing-shaped blades, a hub and a wheel core, wherein the blades and the hub of the non-metal axial flow impeller are made of glass fiber reinforced unsaturated polyester materials; the number of poles of the multi-pole driving motor is more than or equal to 4, and the non-metal axial flow impeller is connected with a rotating shaft of the multi-pole driving motor; the multi-pole driving motor is arranged in an inner air duct of the main air duct; the frequency converter is connected to the rear end cover of the multi-pole driving motor. The utility model has the advantages of but as required automatically regulated amount of wind, pressure, appearance and interface size are little, the complete machine quality is light, and the radiating efficiency is high.

Description

Lightweight axial flow cooling fan of alternating current transmission locomotive

Technical Field

The utility model relates to a ventilation cooling field, more specifically relates to a lightweight axial compressor cooling fan of alternating current transmission locomotive.

Background

The converter and the transformer are one of key devices of the rail transit alternating current transmission locomotive. When the converter and the transformer work, a large amount of heat is generated in the converter and the transformer, in order to prevent overheating damage and ensure normal operation of the alternating-current transmission locomotive, a cooling system needs to be matched to forcedly dissipate heat of the converter, and the axial-flow cooling fan is an indispensable key component in the cooling system. In addition, along with the requirements of energy conservation, consumption reduction and reliability of rail transit, the requirements of light weight and reliability of equipment are higher and higher. The lightweight design technology of the axial flow type cooling fan mainly comprises three methods, wherein the first method is to optimize the structure, the existing axial flow type cooling fans are all of thin-wall structures, and the requirements of rail transit equipment on vibration and reliability are very high, so that the optimization space of the structure is smaller under the existing axial flow type cooling fan; secondly, replacing the original metal material with a fiber composite material; and thirdly, a high-speed fan is adopted to replace a low-speed fan, and a multi-pole motor is adopted to replace a 2-pole motor, so that the overall volume of the fan can be reduced, and the structural weight can be reduced. For the reliability of the axial-flow type cooling fan, the structural vibration and the strength of the fan are controlled, and the rotating speed of the axial-flow type cooling fan under different working condition requirements is also controlled, so that the fan is prevented from working at a rated rotating speed for a long time, the reliability of the fan is improved, and the intelligent control of the fan under different working condition requirements is realized. At present, the research on high-speed axial fans at home and abroad is more, and compressors of high-speed magnetic suspension and air bearings, such as CN 109162940A, CN 108716480A, CN 104179712A and the like, are obviously different from the rolling bearing high-speed axial fan. For a rolling shaft high-speed axial flow fan, CN 109555718A mainly discloses a high-speed permanent magnet brushless axial flow fan, which mainly researches a casing, a stator, a rotor and fan blades, and focuses on the technical protection of a permanent magnet motor; CN 107425634A discloses a superspeed three-phase axial flow fan, which is mainly used for protecting the electromagnetic design patent of a motor.

At present, an axial flow cooling fan for a cooling system of an alternating current transmission locomotive is large in size, the diameter of the axial flow cooling fan reaches 1m, the weight of the axial flow cooling fan reaches 360kg, and the requirement for light weight of future rail transit equipment is difficult to meet. Based on the research, the lightweight axial-flow type cooling fan integrating high rotating speed, non-metal materials, a multi-pole motor and frequency conversion control is developed, and the technical requirement of lightweight rail transit equipment is met.

Disclosure of Invention

The utility model discloses an overcome prior art not enough, design one kind and had both had the light-weighted characteristics, had the function with adjustable performance again for the radiating interchange transmission locomotive lightweight axial compressor cooling fan of electric locomotive cooling tower. The fan can be adjusted according to the requirement to realize various different flow pressures through the change of power supply frequency on the premise of not changing hardware, and the use requirements of different environmental conditions are met. The utility model discloses a lighter axial compressor cooling fan weight of alternating current transmission locomotive has reduced 100kg than former cooling system fan.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a light axial flow cooling fan of an AC transmission locomotive is characterized by comprising a main ventilation duct (1) formed by flange connection; the ventilation channel comprises an outer air channel (12) and an inner air channel (15); the main air duct is sequentially provided with a mounting flange (11), a front arc-shaped stationary blade (13), a flow guide hemispheroid (14), a non-metal axial flow impeller (2) and an arc-shaped flow guide stationary blade (16) from an air inlet area to an air outlet area; a multi-pole driving motor (3) is arranged in the inner air duct (15); the multi-pole driving motor (3) is connected with the nonmetal axial flow impeller (2).

Furthermore, the front arc-shaped stationary blade (13) and the flow guide hemisphere (14) are welded into a whole; the front arc-shaped fixed blade (13) and the outer air duct (12) are welded together.

Furthermore, the arc-shaped guide stationary blade (16) is welded with the outer air duct (12) and the inner air duct (15) into a whole.

Furthermore, the blades of the nonmetal axial flow impeller (2) are twisted wing blades, and the whole impeller is made of glass fiber reinforced unsaturated polyester.

Furthermore, the twisted wing blade (21) of the nonmetal axial flow impeller adopts a twisted wing shape, the radius of an inlet arc is 2-2.5mm, the radius of an outlet arc is 1.5-2mm, the maximum thickness of the blade is 12mm, the root part of a blade installation angle is 42-45 degrees, and the top part is 27-30 degrees. The hub (22) adopts a circular arc shape, and the radius of the circular arc is 110 mm and 118 mm.

Furthermore, the mounting flange (11), the front arc-shaped stationary blade (13), the flow guide hemispheroid (14) and the arc-shaped flow guide stationary blade (16) are formed by welding aluminum alloy.

Furthermore, the central axes of the installation positions of the main air duct (12), the front arc-shaped stationary blade (13), the flow guide hemispheroid (14), the nonmetal axial flow impeller (2) and the arc-shaped flow guide stationary blade (16) are overlapped.

Furthermore, the arc radius of the front arc stationary blade (13) is 165-185mm, and the hemispherical radius of the flow guiding hemisphere is 105-115 mm.

Further, the arc radius of the arc-shaped guide stationary blade (16) is 249-.

The utility model has the advantages as follows:

(1) the utility model discloses set up the converter and carry out frequency conversion to the power, the nonmetal axial compressor impeller of multipolar driving motor drive rotates, adopts the power drive motor of different frequencies, realizes the effect of adjusting the impeller rotational speed, the pressure, wind speed, the flow that the utility model produced are adjustable, can be under definite structure and size, provide the ventilation cooling flow and the pressure that are applicable to the electric locomotive cooling tower of large-traffic and high pressure requirement; and the external dimension and the weight can be reduced as much as possible in the design process under the condition of meeting the requirements of different working conditions. The rotating speed of the fan is 4500rpm to 5200rpm, the rotating speed can be selected to use low-cost materials, and the noise of the fan is controlled not to exceed 100dB (A) and is 3dB (A) lower than that of a common axial flow fan.

(2) The utility model discloses confirm the speed governing control mode of fan converter, control temperature is cooling tower radiator oil circuit export temperature, and control temperature is confirmed according to ambient temperature and oil circuit temperature, and control temperature decides the rotational speed of fan, and the rotational speed divide into 7 ~ 12 shelves. Different ambient temperatures and oil circuit temperatures may be selected to achieve the same control temperature and fan speed. The switching of different gears is realized by adopting the gradual ascending and descending frequency of the frequency converter, after the control module determines the control temperature, whether the actual temperature is in accordance with the control temperature or not is detected, the actual temperature is higher than the control temperature, a digital signal is given out to control the frequency converter to ascend, the actual temperature is lower than the control temperature, the digital signal is given out to control the frequency converter to descend, the actual temperature is within the control temperature range, the rotating speed is maintained to be stable, and therefore the rotating speed corresponding to the control temperature can be subjected to multi-stage speed regulation in real time in the control.

(3) The frequency converter of the fan can be started to a gear corresponding to the frequency according to the power supply voltage and the frequency, and then the frequency converter is adjusted to the optimal gear according to the actual control temperature.

(4) The nonmetal axial flow impeller of the utility model adopts the glass fiber reinforced unsaturated polyester to manufacture the impeller, so as to ensure that the components can stably and reliably work under the working condition of high-speed operation, and the service life can reach more than 10 years;

(5) the utility model discloses be provided with leading arc quiet leaf, water conservancy diversion hemisphere, convex water conservancy diversion quiet leaf in main ventiduct, these structures and the reasonable cooperation of high-speed rotatory impeller can lead to high-speed fluid, make it more smoothly pass through, effectively reduce the loss, improve the efficiency of complete machine, reduce the noise of fan.

(6) The utility model discloses each spare part adopts the excellent performance's alloy aluminium material to make, has alleviateed the complete machine quality, has improved the heat-sinking capability simultaneously, guarantees that the miniaturized later temperature rise of high-speed motor is less than the motor of general rotational speed.

(7) The utility model discloses a multipolar driving motor 2, the shell adopts the casting aluminum alloy, promotes heat-sinking capability, through adopting the multipolar scheme, reduces complete machine weight and rotor weight, improves fan life-span and reliability.

Drawings

Fig. 1 is a schematic structural view of a lightweight axial flow cooling fan of an ac transmission locomotive according to the present invention;

FIG. 2 is a schematic view of the structure of the main air duct;

FIG. 3 is a schematic structural view of a non-metallic axial flow impeller;

FIG. 4 is a schematic view of a leading arc vane configuration;

fig. 5 is a schematic structural view of a circular arc-shaped guide stationary blade.

Reference numerals: the device comprises a main air duct 1, a nonmetal axial flow impeller 2, a multipole driving motor 3, a frequency converter 4, a mounting flange 11, an outer air duct 12, a front arc stationary blade 13, a flow guide hemispheroid 14, an inner air duct 15, a circular arc flow guide stationary blade 16, blades 21, a hub 22 and a hub core 23.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, the utility model provides a light axial flow cooling fan of an alternating current transmission locomotive, which comprises a main ventilation duct formed by connecting large mounting flanges; wherein the main air duct comprises an outer air duct 12 and an inner air duct 15; the main air duct is sequentially provided with a front arc-shaped stationary blade 13, a flow guide hemispheroid 14, a nonmetal axial flow impeller 2 and a circular arc-shaped flow guide stationary blade 16 from an air inlet area to an air outlet area, and the central axes of the installation positions of all the parts are overlapped.

The multi-pole driving motor 3 is installed in the inner auxiliary ventilation duct, the multi-pole driving motor 3 is connected with the nonmetal axial flow impeller 2 through a rotating shaft, the rotating speed output by the multi-pole driving motor 3 can be adjusted through the frequency converter 4, so that the rotating speed of the nonmetal axial flow impeller 2 driven by the multi-pole driving motor can be adjusted, the pressure, the wind speed and the flow of fluid generated by the nonmetal axial flow impeller 2 can be changed according to the change of the rotating speed of the nonmetal axial flow impeller 2, and the specific structure of the nonmetal axial flow impeller 2 is shown in figure 3.

The front arc-shaped fixed blade 13 and the flow guide hemispheroid 14 are welded into a whole, the front arc-shaped fixed blade and the outer air duct 12 are welded together, the mounting rigidity is guaranteed, the vibration during operation is reduced, the front arc-shaped fixed blade 13 guarantees that the angle of airflow gradually transits from being parallel to the axis to being consistent with the angle of the inlet of the impeller blade, and the airflow basically enters the inlet of the impeller without loss. The leading arc vane 13 is specifically configured as shown in fig. 3.

The arc-shaped guide stationary blade 16 is arranged between the outer air duct 12 and the inner air duct 15 and welded with the outer air duct and the inner air duct, on the premise of ensuring the overall strength and rigidity, the arc-shaped guide stationary blade is made of aluminum alloy, so that the light weight is realized, better heat dissipation is realized, the arc-shaped guide stationary blade 16 enables the angle between the air flow and the axis of the fan to gradually transition from about 20 degrees to close to 0 degree, the air flow enters the cooling tower radiator needing heat dissipation more smoothly at the outlet, and the overall efficiency is improved. Fig. 4 shows a specific structure of the circular arc guide vane 16.

Based on above structure, the utility model discloses a concrete working method as follows:

the utility model provides a novel high-speed axial-flow fan for alternating current transmission electric locomotive cooling tower effect is for locomotive cooling tower ventilation cooling. The low-temperature air flow enters a front air duct of a fan from a filter grid at the top of the locomotive, after being guided by a front arc-shaped fixed blade and a guide hemisphere, the air flow enters an impeller at a certain angle, after the impeller rotates at a high speed, the air flow speed and pressure are greatly improved, then the air flow is thrown out of an outer air duct, the air flow is guided by the arc-shaped guide fixed blade and then enters a high-temperature aluminum heat dissipation structure of a cooling tower along the axis, the temperature in the aluminum heat dissipation structure is conducted to air, the air temperature is increased, the high-temperature air flows out of the cooling tower along with the air flow and enters the atmosphere at the bottom of the locomotive, and the.

The utility model provides a mounting flange 11, outer wind channel 12, leading arc quiet leaf 13, water conservancy diversion hemisphere 14, interior wind channel 15 and convex water conservancy diversion quiet leaf 16 according to operation requirement's difference, can adopt different models, and the alloy aluminium material that welding performance is good makes, when lightening complete machine weight, can improve the heat-sinking capability.

The nonmetal axial flow impeller 2 is made of different glass fiber reinforced unsaturated polyester materials according to the requirement of rotating speed, the blades are twisted wing blades, and the impeller is integrally molded; when the rotating speed is lower than 4000r/min, common glass fiber reinforced unsaturated polyester can be used, the rotating speed is 4000r/min to 5000r/min, high-strength glass fiber reinforced unsaturated polyester can be used, and the impeller rotating speed higher than 5000r/min is made of a material with higher strength; the frequency converter drives the multi-pole motor, the shell is made of cast aluminum alloy, the heat dissipation capacity is improved, the weight of the whole machine and the weight of a rotor are reduced by adopting a multi-pole scheme, and the service life and the reliability of the fan are improved.

Example 2

Compared with the embodiment 1, the embodiment provides a non-metal axial flow impeller 2 which adopts a twisted airfoil shape, wherein the radius of an inlet arc is 2mm, the radius of an outlet arc is 1.5mm, the maximum thickness of each blade is 12mm, the root part of each blade installation angle is 42 degrees, and the top part of each blade installation angle is 27 degrees. The wing blade impeller with the specification can provide large air volume and wind pressure, and is stable in operation and high in efficiency. The utility model discloses import circular arc radius 2-2.5mm, export circular arc radius 1.5-2mm, the biggest thickness of blade 12mm, blade installation angle root is 42 ~ 45, and the top is 27 ~ 30. The hub (22) adopts a circular arc shape, and the radius of the circular arc is 110 mm and 118 mm.

Compared with embodiment 2, this embodiment provides a leading arc stationary blade, the arc radius of which is 175mm, and the hemispherical radius of the flow guiding hemisphere is 111 mm.

Compared with embodiment 2, the present embodiment provides an arc-shaped guide stationary blade, which has an arc radius of 259mm, an inscribed arc radius of 115mm, and an inscribed arc radius of 189 mm.

Example 3

As shown in table 1, the utility model provides an axial flow cooling fan control mode of alternating current transmission locomotive lightweight controls to different service environment conditions. According to different combinations of the ambient temperature, the water temperature of the cooling tower and the oil temperature, different rotating speeds are set, and the fan provides different pressures and flows.

TABLE 1

Ambient temperature °	Waterway temperature °	Temp. of oil path	Controlling the temperature °	Fan speed rpm
					-40～-20	1	27	50～55	2000～2500
-20～10	31	57	60～65	2500～3000
					10～30	51	77	80～85	3500～4500
30～40	61	87	90～95	4500～5200
					-40～-20	1	17	40～45	1500～2000
-20～10	21	37	50～55	2000～2500
					10～30	41	57	60～65	2500～3000
30～40	51	67	70～75	3000～3500
					-40～-20	1	7	30～35	1500
-20～10	11	27	40～45	1500～2000
					10～30	31	47	50～55	2000～2500
30～40	41	57	60～65	2500～3000

The control temperature of the fan is the outlet temperature of an oil circuit of a cooling tower radiator, the control temperature is determined according to the environment temperature and the temperature of the oil circuit, the control temperature determines the rotating speed of the fan, and the rotating speed is divided into seven gears. Different ambient temperatures and oil circuit temperatures may be selected to achieve the same control temperature and fan speed. The switching of different gears is realized by adopting the gradual ascending and descending frequency of the frequency converter, after the control module determines the control temperature, whether the actual temperature is compounded with the control temperature or not is detected, the actual temperature is higher than the control temperature, a digital signal is given out to control the frequency converter to ascend, the actual temperature is lower than the control temperature, the digital signal is given out to control the frequency converter to descend, the actual temperature is within the control temperature range, the rotating speed is maintained to be stable, and therefore the stepless speed regulation can be realized in real time when the rotating speed corresponding to the control temperature is within the control gears. Specific control parameters are shown in table 1.

It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (9)

1. Exchange lightweight axial compressor cooling blower of transmission locomotive, its characterized in that mainly includes main ventiduct (1), nonmetal axial compressor impeller (2), multipolar driving motor (3) and converter (4) combination, main ventiduct (1) includes: the air conditioner comprises a mounting flange (11), an outer air duct (12), a front arc-shaped stationary blade (13), a flow guide hemisphere (14), an inner air duct (15) and an arc-shaped flow guide stationary blade (16); the nonmetal axial flow impeller comprises wing-shaped blades (21), a hub (22) and a wheel core (23), wherein the blades (21) and the hub (22) of the nonmetal axial flow impeller (2) are made of glass fiber reinforced unsaturated polyester materials; the non-metal axial flow impeller (2) is connected with a rotating shaft of the multi-pole driving motor (3); the multi-pole driving motor (3) is arranged on an inner air duct (15) of the main air duct (1); the frequency converter (4) is connected to the rear end cover of the multi-pole driving motor (3).

2. The axial flow cooling fan according to claim 1, wherein the front arc-shaped stationary blade (13) is arranged between the flow guiding hemisphere (14) and the outer air duct (12) and welded with the flow guiding hemisphere and the outer air duct; the arc-shaped guide stationary blade (16) is arranged between the outer air duct (12) and the inner air duct (15) and welded with the outer air duct and the inner air duct; the mounting flange (11), the front arc-shaped stationary blade (13), the flow guide hemispheroid (14) and the arc-shaped flow guide stationary blade (16) are formed by welding aluminum alloy.

3. The axial-flow cooling fan as claimed in claim 2, wherein the arc radius of the front arc stationary blade (13) is 165-185mm, and the hemisphere radius of the flow guiding hemisphere (14) is 105-115 mm; the arc radius of the circular arc-shaped guide stationary blade (16) is 249-269mm, the radius of the inscribed arc is 110-120mm, and the radius of the inscribed arc is 179-199 mm.

4. The axial-flow cooling fan according to claim 1, wherein the blades (21), the hub (22) and the hub core (23) of the non-metallic axial-flow impeller (2) are integrally molded.

5. The axial-flow cooling fan according to claim 4, wherein the blades (21) are twisted airfoil-shaped, the radius of the inlet arc is 2-2.5mm, the radius of the outlet arc is 1.5-2mm, the maximum thickness of the blade is 12mm, the root of the blade mounting angle is 42-45 degrees, the top is 27-30 degrees, the hub (22) is arc-shaped, and the radius of the arc is 110-118 mm.

6. The axial-flow cooling fan according to claim 1, wherein the main air duct (1) is provided with a front arc-shaped stationary blade (13), a flow guiding hemisphere (14), a non-metal axial-flow impeller (2), and a circular arc-shaped flow guiding stationary blade (16) in sequence from an air inlet region to an air outlet region.

7. The axial-flow cooling fan according to claim 6, wherein the central axes of the installation positions of the main air duct (1), the front arc-shaped stationary blade (13), the flow guiding hemispheroid (14), the non-metal axial-flow impeller (2) and the arc-shaped flow guiding stationary blade (16) are coincident.

8. The axial-flow cooling fan according to claim 1, wherein the rated speed of the multi-pole driving motor (3) is 4500-5200 rpm, and the number of poles of the motor is greater than or equal to 4, which helps to reduce the motor volume and weight.

9. The axial flow cooling fan according to claim 1, wherein the speed of the frequency converter (4) is controlled by adopting 7-12 gears to control the rotating speed of the motor according to the ambient temperature, the water path temperature, the oil path temperature and the like, so that the reliability of the axial flow cooling fan is better improved under the condition of meeting the cooling conditions of different working conditions.

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