阅读说明：本技术 一种制动冷却装置及冷却风机控制方法 (Brake cooling device and cooling fan control method ) 是由 眭铁杰 吴凯 胡金润 李香情 谭志雄 欧军晖 史雅君 于 2019-12-20 设计创作，主要内容包括：本发明提供了一种制动冷却装置包括柜体、冷却单元和制动单元；所述冷却单元包括散热器组和冷却回路,所述散热器组和冷却回路均设置于柜体的外部且散热器组位于柜体的进风口端,所述冷却回路连接外接设备和散热器组从而实现对外接设备进行散热；所述制动单元包括均设置于柜体内部且顺次连接的冷却风机、过渡风道和电阻单元,所述冷却风机位于散热器组和过渡风道之间,从而实现冷却空气与散热器组进行热交换之后依次经过冷却风机和过渡风道对电阻单元进行散热。同时兼顾对冷却装置散热和制动单元散热的需求。本发明还提供了一种冷却风机控制方法,可以有效地防止冷却风机频率频繁切换导致温升过高的问题。(The invention provides a brake cooling device which comprises a cabinet body, a cooling unit and a brake unit; the cooling unit comprises a radiator group and a cooling loop, the radiator group and the cooling loop are both arranged outside the cabinet body, the radiator group is positioned at the air inlet end of the cabinet body, and the cooling loop is connected with the external equipment and the radiator group so as to realize the heat dissipation of the external equipment; the brake unit is including all setting up in the internal portion of cabinet and the cooling blower, transition wind channel and the resistance unit of connecting in order, cooling blower is located radiator group and transition between the wind channel to realize that cooling air dispels the heat to the resistance unit through cooling blower and transition wind channel in proper order after carrying out the heat exchange with radiator group. Meanwhile, the requirements for heat dissipation of the cooling device and the brake unit are met. The invention also provides a cooling fan control method which can effectively prevent the problem of overhigh temperature rise caused by frequent switching of the frequency of the cooling fan.)

1. The brake cooling device is characterized by comprising a cabinet body (8), a cooling unit and a brake unit; the cooling unit comprises a radiator group and a cooling loop, the radiator group and the cooling loop are both arranged outside the cabinet body (8), the radiator group is positioned at the air inlet end of the cabinet body (8), and the cooling loop is connected with the external equipment and the radiator group so as to realize the heat dissipation of the external equipment;

the brake unit comprises a cooling fan (4), a transition air channel (5) and a resistor unit (6) which are all arranged inside the cabinet body (8) and connected in sequence, wherein the cooling fan (4) is located between the radiator group and the transition air channel (5), so that heat of cooling air and the radiator group is sequentially dissipated to the resistor unit (6) through the cooling fan (4) and the transition air channel (5) after heat exchange is carried out.

2. Brake cooling arrangement according to claim 1, characterised in that the cooling circuit comprises a first cooling circuit and a second cooling circuit, the radiator group comprising a first radiator (21) and a second radiator (22); the first cooling loop comprises a first water inlet pipeline and a first water outlet pipeline, and the first radiator (21), the first water outlet pipeline, the first external equipment and the first water inlet pipeline sequentially form a circulating loop, so that the first external equipment is cooled; the second cooling loop comprises a second water inlet pipeline and a second water outlet pipeline, and the second radiator (22), the second water outlet pipeline, the second external equipment and the second water inlet pipeline sequentially form a circulating loop, so that the second external equipment is cooled.

3. A brake cooling device according to claim 2, characterized in that the air inlet side of the radiator group is provided with a filter screen (9).

4. The brake cooling device according to claim 2, wherein the first water outlet pipeline and the second water outlet pipeline are sequentially provided with a temperature sensor (23), a water pump, a pressure sensor (97) and a valve (94), and the first water inlet pipeline and the second water inlet pipeline are sequentially provided with a valve (94), a filter (93) and a temperature sensor (23); temperature sensors (23) on the first water outlet pipeline and the first water inlet pipeline are both close to the first radiator (21) and are arranged, and temperature sensors (23) on the second water outlet pipeline and the second water inlet pipeline are both close to the second radiator (22).

5. The brake cooling device according to claim 4, wherein an expansion tank is arranged between the first water outlet pipeline and the first water inlet pipeline and between the second water outlet pipeline and the second water inlet pipeline through an auxiliary water pipe (92), and a pressure release valve (33) and a liquid level observation window (34) are arranged on the expansion tank.

6. The brake cooling device according to any one of claims 1-5, characterized in that the cooling fan (4) comprises a fan body and a rotational speed sensor (42), wherein the rotational speed sensor (42) is arranged at the end of the motor (41) in the fan body, and the monitoring of the rotational speed of the cooling fan is realized.

7. The brake cooling device according to claim 6, wherein the transition air duct (5) comprises a transition air duct shell (51), an inner tube (52) and a conical tube (53), one end of the transition air duct shell (51) is connected with an air outlet of the cooling fan (4), and the other end of the transition air duct shell faces the resistance unit (6) and is connected with the cabinet body (8) to blow cooling air to the resistance unit (6);

inner tube (52) and awl section of thick bamboo (53) coaxial line set up in the inside of transition wind channel shell (51), awl section of thick bamboo (53) are located inner tube (52), inner tube (52) are toper tube structure, and the big awl end of inner tube (52) is close to cooling blower (4) and sets up, and the little awl end of inner tube (52) is close to resistance unit (6) and sets up, awl section of thick bamboo (53) are confined conical structure, and the big awl end of awl section of thick bamboo (53) is close to cooling blower (4) and sets up, and the little awl end of awl section of thick bamboo (53) is close to resistance unit (6) and sets up, realizes carrying out the water conservancy diversion to cooling air through inner tube (52) and awl section of thick bamboo (53).

8. The brake cooling device according to claim 7, further comprising a flow guiding grid (7), wherein the flow guiding grid (7) is arranged at an air outlet end of the cabinet body (8) to guide air from the resistance unit (6); a plurality of guide vanes (71) arranged at the same guide angle theta are arranged in the guide grid (7), and the value range of the guide angle theta is 40-60 degrees.

9. Brake cooling device according to claim 8, characterised in that the resistance unit (6) comprises a plurality of braking resistors (61) arranged in the direction of flow of the cooling air, the lower part of the braking resistors (61) being connected to the cabinet (8) by means of a support (62), and the upper part of the braking resistors (61) being connected to the cabinet (8) by means of the mounting points of the braking resistors (61) themselves.

10. A cooling fan control method of a brake cooling device according to any one of claims 1 to 9,

the cooling fan switches the working frequency according to a frequency increasing instruction or a frequency decreasing instruction sent by a control device, and the frequency conversion power P1 of the cooling fan is set by the control device;

when the electric braking power of the braking unit is lower than the variable frequency power P1, the cooling fan works in a low-frequency state;

when the electric braking power of the braking unit is higher than the variable frequency power P1, the frequency increasing command is triggered, and the cooling fan changes according to the frequency increasing change rate f₁Lifting to the highest frequency state to work;

when the cooling fan works in the highest frequency state, the electric braking power of the braking unit is lower than the variable frequency power P1, namely, a frequency reduction instruction is triggered, and at t₁The frequency increasing instruction is not triggered again within the time, and the cooling fan reduces the frequency according to the frequency change rate f₂Reducing the frequency to low frequency;

wherein the cooling fan adopts an AC variable frequency motor, f₂F is less than or equal to₁。

Technical Field

The invention relates to the technical field of mining electric wheel dump trucks, in particular to a brake cooling device and a cooling fan control method.

Background

The mining electric wheel dump truck is used as a main transport tool for mining operation of a large-scale surface mine, and plays a role in lifting weight in transport equipment of the large-scale surface mine with annual mining capacity of more than 1000 ten thousand tons along with the improvement of requirements on tonnage, performance, quantity and the like of the mining electric wheel dump truck. The brake resistance device is one of the components of the mining electric wheel dumper and is a key component for realizing electric braking of an electric transmission system, the electric braking power is generally related to the tonnage of the dumper and ranges from 1MW to 5MW, the electric energy is converted into heat energy by the brake resistance during electric braking, and the heat energy is blown to the atmosphere in a forced air cooling mode.

Regarding the permanent magnet motor technology, when the permanent magnet traction motor and the permanent magnet generator are applied to the electric wheel dumper, the weight of the whole dumper can be reduced by several tons, so that the permanent magnet traction motor and the permanent magnet generator are greatly beneficial to saving oil consumption in the driving process of a mining dumper, and the use cost is reduced. When the permanent magnet motor is applied to the electric wheel dumper, a cooling device needs to be matched, and circulating cooling liquid is used for carrying out water cooling heat dissipation on the permanent magnet motor.

However, the permanent magnet traction motor and the permanent magnet generator have strict requirements on the water inlet temperature, wherein the water inlet temperature of the permanent magnet traction motor is required to be less than or equal to 70 ℃, and the water inlet temperature of the permanent magnet generator is required to be less than or equal to 65 ℃, so that the cooling device is required to meet the heat dissipation requirements of the permanent magnet traction motor and the permanent magnet generator at the same time.

In addition, the heat dissipation power of the cooling device is lower than 100kW, the electric braking power of the braking resistor device is about 1MW to 5MW, and there is a great numerical difference between the consumed energies of the cooling device and the braking resistor device, so that when the cooling device and the braking resistor device are integrated, the heat dissipation requirement of the cooling device and the heat dissipation requirement of the braking resistor device need to be considered at the same time.

In view of the above, there is a need for a brake cooling device and a cooling fan control method to solve the problems in the prior art.

Disclosure of Invention

The invention aims to provide a brake cooling device, which has the following specific technical scheme:

a brake cooling device comprises a cabinet body, a cooling unit and a brake unit; the cooling unit comprises a radiator group and a cooling loop, the radiator group and the cooling loop are both arranged outside the cabinet body, the radiator group is positioned at the air inlet end of the cabinet body, and the cooling loop is connected with the external equipment and the radiator group so as to realize the heat dissipation of the external equipment;

the brake unit is including all setting up in the internal portion of cabinet and the cooling blower, transition wind channel and the resistance unit of connecting in order, cooling blower is located radiator group and transition between the wind channel to realize that cooling air dispels the heat to the resistance unit through cooling blower and transition wind channel in proper order after carrying out the heat exchange with radiator group.

Preferably, in the above technical solution, the cooling circuit includes a first cooling circuit and a second cooling circuit, and the radiator group includes a first radiator and a second radiator; the first cooling loop comprises a first water inlet pipeline and a first water outlet pipeline, and the first radiator, the first water outlet pipeline, the first external equipment and the first water inlet pipeline sequentially form a circulating loop, so that the first external equipment is cooled; the second cooling loop comprises a second water inlet pipeline and a second water outlet pipeline, and the second radiator, the second water outlet pipeline, the second external equipment and the second water inlet pipeline sequentially form a circulating loop, so that the second external equipment is cooled.

Preferably among the above technical scheme, the air inlet side of radiator group is equipped with the filter screen.

Preferably, in the above technical scheme, the first water outlet pipeline and the second water outlet pipeline are sequentially provided with a temperature sensor, a water pump, a pressure sensor and a valve, and the first water inlet pipeline and the second water inlet pipeline are sequentially provided with a valve, a filter and a temperature sensor; the temperature sensors on the first water outlet pipeline and the first water inlet pipeline are both close to the first radiator, and the temperature sensors on the second water outlet pipeline and the second water inlet pipeline are both close to the second radiator.

Preferably among the above technical scheme, all be equipped with expansion tank through the auxiliary water pipe between first outlet pipe way and the first water inlet pipe way and between second outlet pipe way and the second water inlet pipe way, expansion tank is last to be equipped with relief valve and liquid level observation window.

Preferably among the above technical scheme, cooling blower includes fan body and speed sensor, speed sensor sets up the tip of motor in the fan body, realizes monitoring cooling blower's rotational speed.

Preferably, in the above technical scheme, the transition air duct includes a transition air duct housing, an inner tube and a cone, one end of the transition air duct housing is connected to an air outlet of the cooling fan, and the other end of the transition air duct housing faces the resistance unit and is connected with the cabinet body to realize that cooling air blows to the resistance unit;

inner tube and awl section of thick bamboo coaxial line set up in the inside of transition wind channel shell, a awl section of thick bamboo is located the inner tube, the inner tube is toper tube structure, and the big awl end of inner tube is close to the cooling blower setting, and the little awl end of inner tube is close to the resistance unit setting, a awl section of thick bamboo is confined circular cone structure, and the big awl end of a awl section of thick bamboo is close to the cooling blower setting, and the little awl end of a awl section of thick bamboo is close to the resistance unit setting, realizes carrying out the water conservancy diversion to cooling air through inner tube and a awl.

Preferably, the air conditioner further comprises a flow guiding grid, wherein the flow guiding grid is arranged at the air outlet end of the cabinet body to guide the air coming out of the resistance unit; a plurality of guide vanes which are arranged at the same guide angle theta are arranged in the guide grid, and the value range of the guide angle theta is 40-60 degrees.

Preferably, in the above technical solution, the resistance unit includes a plurality of braking resistors arranged along a flow direction of the cooling air, a lower portion of the braking resistor is connected with the cabinet body through the supporting seat, and an upper portion of the braking resistor is connected with the cabinet body through a mounting point of the braking resistor itself.

The technical scheme of the invention has the following beneficial effects:

(1) the brake cooling device comprises a cabinet body, a cooling unit and a brake unit, wherein the cooling unit comprises a radiator group and a cooling loop, and the radiator group and the cooling loop are used for radiating heat of external equipment, namely a permanent magnet traction motor and a permanent magnet generator; the cooling air sequentially passes through the radiator group, the cooling fan, the transition air duct and the resistor unit, so that the heat exchange between the cooling air and the radiator group is realized, and then the heat of the resistor unit is sequentially dissipated through the cooling fan and the transition air duct, so that the heat dissipation function of the cooling device (namely, the heat dissipation function of the radiator group) and the heat dissipation function of the resistor unit (brake resistor) are integrated; cooling blower operates at the high frequency when the electric braking operating mode, preferentially satisfies the electric braking power demand, also can satisfy cooling device heat dissipation demand because of the amount of wind is big, and cooling blower operates at the low frequency when non-electric braking operating mode, only needs to satisfy cooling device heat dissipation demand, reduces consumption and fan noise, solves the problem that there is huge difference in both power of cooling device and braking resistance simultaneously.

(2) The cooling loop in the braking cooling device comprises a first cooling loop and a second cooling loop, wherein the first cooling loop realizes heat dissipation of first external equipment, namely a permanent magnet generator, and the second cooling loop realizes heat dissipation of second external equipment, namely a permanent magnet traction motor; the first cooling loop and the second cooling loop are independent from each other and do not influence each other, and the requirements of the permanent magnet traction motor and the permanent magnet generator on different water inlet temperatures are met.

(3) According to the braking cooling device, the filter screen is arranged on the air inlet side of the radiator group, so that the radiator can be well protected from being impacted by stones, branches and other sundries falling from a mine, and maintenance and cleaning operations can be well performed.

(4) According to the brake cooling device, the temperature sensors are arranged in the first water outlet pipeline, the second water outlet pipeline, the first water inlet pipeline and the second water inlet pipeline, so that the working state of the radiator can be known in time, the working frequency of the cooling fan can be adjusted according to the water outlet temperature and the limit value of the water outlet temperature, the noise of the fan is reduced, the heat dissipation capacity of the radiator is fully exerted, and the heat dissipation capacity and the working noise of the device are closer to the use requirements of users.

(5) According to the brake cooling device, the expansion water tanks are arranged between the first water outlet pipeline and the first water inlet pipeline and between the second water outlet pipeline and the second water inlet pipeline through the auxiliary water pipes, the expansion water tanks are provided with the pressure release valves and the liquid level observation windows, the pressure release of the first cooling loop or the second cooling loop and the removal of gas in the cooling loops are realized through the pressure release valves, or cooling media are added, and the quantity of the cooling media in each cooling loop is known constantly through the liquid level observation windows.

(6) The brake cooling device is provided with the transition air duct, so that air blown by the impeller of the cooling fan in a rotating mode is uniformly transited into the brake resistor through the inner cylinder and the conical cylinder, the heat exchange efficiency of the brake resistor is improved, the condition that the air speed at the middle part of the brake resistor is low is reduced, and the highest temperature of the brake resistor is reduced.

(7) The braking cooling device is provided with the flow guide grids, hot air is guided to the side face of the mine car through the flow guide grids, and the air inlet temperature of the air inlet equipment on the rear side and the bottom of the converter cannot be increased.

The invention also provides a cooling fan control method of the brake cooling device, the cooling fan switches the working frequency according to the frequency increasing instruction or the frequency decreasing instruction sent by the control device, and the frequency conversion power P1 of the cooling fan is set by the control device;

when the electric braking power of the braking unit is lower than the variable frequency power P1, the cooling fan works in a low-frequency state;

when the electric braking power of the braking unit is higher than the variable frequency power P1, the frequency increasing command is triggered, and the cooling fan changes according to the frequency increasing change rate f₁Lifting to the highest frequency state to work;

when the cooling fan works in the highest frequency state, the electric braking power of the braking unit is lower than the variable frequency power P1, namely, a frequency reduction instruction is triggered, and at t₁The frequency increasing instruction is not triggered again within the time, and the cooling fan reduces the frequency according to the frequency change rate f₂Reducing the frequency to low frequency;

wherein the cooling fan adopts an AC variable frequency motor, f₂F is less than or equal to₁。

Based on the condition that the cooling fan always works after the dump truck is started, the control method of the cooling fan disclosed by the invention has the advantages that when the electric braking power is lower than P1, the fan always works at a low frequency, and when the electric braking power is higher than P1, the fan works at a high frequency. The fan control method can shield the fan frequency switching condition caused by frequently stepping on the electric brake pedal under the condition that the electric brake power is lower than P1, can effectively reduce the fan frequency switching frequency caused by frequently stepping on the electric brake pedal when the fan is in high frequency, and simultaneously needs to switch the fan frequency according to f₁Up-conversion by f₂The frequency is reduced, the temperature rise value of the fan caused by frequency switching is reduced (the temperature rise value can be too high due to too fast single frequency change), the temperature rise of the fan is controlled within a standard requirement range, and the reliability and the service life of the fan are improved. At the same time, t₁The fan is subjected to frequency reduction in a time delay manner, the operation that a driver frequently steps on a brake pedal in the time can be accommodated, and the frequency of fan frequency switching is reduced.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the brake cooling apparatus of the present invention;

FIG. 2 is a schematic structural view of the brake cooling apparatus of the present invention;

FIG. 3 is a schematic view of the structure of the cooling unit of the present invention;

FIG. 4 is a schematic structural view of the brake unit of the present invention;

FIG. 5 is a schematic view of the cooling fan of the present invention;

FIG. 6 is a schematic structural view of a transition duct according to the present invention;

FIG. 7 is a schematic view of the structure of the flow grid of the present invention;

FIG. 8 is a front view of the brake cooling apparatus of the present invention;

11, a first water pump, 12, a second water pump, 21, a first radiator, 22, a second radiator, 23, a temperature sensor, 31, a first expansion water tank, 32, a second expansion water tank, 33, a pressure release valve, 34, a liquid level observation window, 4, a cooling fan, 41, a motor, 42, a rotation speed sensor, 5, a transition air duct, 51, a transition air duct shell, 52, an inner tube, 53, a conical tube, 54, a front support round rod, 55, a rear support round rod, 6, a resistance unit, 61, a brake resistor, 62, a support seat, 7, a flow guide grid, 71, a flow guide sheet, 8, a cabinet body, 9, a filter screen, 91, a main water pipe, 92, an auxiliary water pipe, 93, a filter, 94, a valve, 95, a quick connector, 96, a fixing clamp, 97 and a pressure sensor.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.