CN212627373U - Cross internal circulation cooling structure of closed box type motor - Google Patents

Abstract

The utility model relates to a seal box motor's alternately inner loop cooling structure, it uses the pivot as the center to be equipped with on the electric motor rotor, the equidistant first axial ventilation hole and the second axial ventilation hole that set gradually, the air-intake inflow end in first axial ventilation hole sets up with the air-intake inflow end in second axial ventilation hole is opposite, the air-intake inflow end in first axial ventilation hole and second axial ventilation hole is equipped with respectively and is used for realizing confined lock pipe with radial ventilation slot, the air inlet outflow end in first axial ventilation hole and second axial ventilation hole is equipped with respectively and is used for cooling off the shutoff of other end rotor winding and stator winding through radial ventilation slot. Compared with the prior art, the utility model discloses the heat dissipation is balanced, can make rotor A, B sectional winding temperature rise, and A, B end bearing temperature tends to unanimity, is favorable to improving because the unbalanced motor material utilization who causes of heat dissipation descends, and power/weight density descends and power/bulk density descend the scheduling problem.

Description

Cross internal circulation cooling structure of closed box type motor

Technical Field

The utility model belongs to the technical field of the closed box motor technique and specifically relates to a closed box motor's alternately inner loop cooling structure is related to.

Background

Enclosed box motors with external (often top-mounted) air-to-air coolers are often cooled by means of IC611, IC616 or IC 666. The cooling air path is composed of a closed-cycle inner air passage and an open-cycle outer air passage, as shown in fig. 1(IC611), fig. 2(IC616), and fig. 3(IC 666). The closed circulation internal air path is formed by forming two symmetrical radial ventilation parallel circuits by the circuit A and the circuit B for a primary cooling medium (usually air) in the closed motor. The external air-air cooler can be provided with an inner air path baffle which simultaneously plays a supporting role for the air guide pipe of the outer air path. Because the secondary cooling medium (usually air) of the open outer air path can only flow in from one end (cold end) of the cooler and flow out from the other end (hot end), the heat dissipation effect of the primary cooling medium in the motor generated in the two parallel circuits A and B is not balanced, the circuit A exchanges heat with the cold end of the outer air path, the circuit B exchanges heat with the hot end of the outer air path, the temperature of the winding of the circuit B is increased to be higher than the temperature of the winding of the circuit A, and the temperature of the bearing close to the circuit B is also higher than the temperature of the bearing close to the circuit A. This imbalance in heat dissipation results in a decrease in material utilization, a decrease in power/weight density, and a decrease in power/volume density of the motor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an improve the cross inner loop cooling structure of closed box motor that temperature rise effect, processing cost are low in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

a crossed internal circulation cooling structure of a closed box type motor is characterized in that a first axial ventilation hole and a second axial ventilation hole are sequentially arranged on a rotor of the closed box type motor at equal intervals by taking a rotating shaft as the center, an air inlet inflow end of the first axial ventilation hole is opposite to an air inlet inflow end of the second axial ventilation hole, an air inlet inflow end of the first axial ventilation hole and an air inlet inflow end of the second axial ventilation hole are respectively provided with a sealing pipe used for realizing sealing with the radial ventilation groove, and air inlet outflow tail ends of the first axial ventilation hole and the second axial ventilation hole are respectively provided with an air inlet outflow end used for cooling a rotor winding and a stator winding at the other end through the radial ventilation groove And (6) plugging.

Preferably, the sum of the length of the sealing pipe installed in the first axial vent hole and the length of the sealing pipe installed in the second axial vent hole is the same as the length of the rotor core.

Preferably, when the lengths of the sealing pipes installed at the air inlet end of the first axial vent and the air inlet end of the second axial vent are different, the arrangement position of the supporting baffle of the air guide pipe of the outer air path in the cooler is the same as the separation position of the two sealing pipes corresponding to the two axial vents.

The utility model provides a seal box motor's alternately inner loop cooling structure compares in prior art and includes following beneficial effect at least:

firstly, the rotor is uniformly and sequentially provided with axial ventilation holes of different air inlet inflow ends at equal intervals by taking a rotating shaft as a center, and an existing A, B air-cooled loop structure with parallel internal circulation is transformed into an air-cooled internal circulation with a section A and a section B in cross series connection by installing a sealing pipe and a plug in the axial ventilation holes, so that heat generated by a winding and an iron core of a section A, B flows through the same loop and is subjected to cross heat exchange with a cold end and a hot end of an external air path to obtain approximately the same heat dissipation effect, the heat dissipation balance of the section A, B can be basically achieved, the temperature rise of the winding of the section A, B tends to be consistent, the temperature of a bearing at the A, B end tends to be consistent, and the problems of reduced utilization rate of motor materials, reduced power/weight density, reduced power/volume density and the like caused by unbalanced heat dissipation;

setting the position of a partition baffle of the cooler to be a separation position of A, B sections of sealed tubes, and adjusting the length of A, B sections of sealed tubes to further enable the temperature of the bearings at the A, B end to be consistent;

the cooling structure of the utility model is suitable for various closed motors with external cooling structures and uneven heat dissipation of cold and hot ends, and can be combined and matched with other cooling structures;

and fourthly, the rotor is uniformly and sequentially provided with axial ventilation holes at different air inlet inflow ends at equal intervals by taking the rotating shaft as the center, and the heat generated by the A, B two sections of windings and the iron core flows through the same loop by installing a sealing pipe and a sealing plug in the axial ventilation holes, so that the air-cooled cooling effect is exerted to the maximum extent, additional circulating power equipment is not needed, the processing cost is low, and the processing difficulty is small.

Drawings

Fig. 1 is a schematic structural diagram of a closed box type motor IC611 type cooling air path in the prior art;

FIG. 2 is a schematic diagram of a cooling air path of a closed box type motor IC616 in the prior art;

FIG. 3 is a schematic diagram of a cooling air path with a closed box motor IC666 in the prior art;

fig. 4 is a schematic diagram of a cross internal circulation cooling structure of a closed box type motor based on an IC611 mode in embodiment 1;

FIG. 5 is a schematic view of the cross internal circulation cooling structure of the closed box type motor based on the IC616 mode in embodiment 1;

FIG. 6 is a schematic view of a cross internal circulation cooling structure of a closed box type motor based on an IC666 mode in embodiment 1;

FIG. 7 is a schematic view showing the installation positions of the pipe sealing and plugging in embodiment 1;

FIG. 8 is a schematic structural view of a single row of axial ventilation holes of the rotor in example 1;

FIG. 9 is a schematic structural view of double-row axial vents of the rotor in example 1;

fig. 10 is a schematic diagram of a cross internal circulation cooling structure of a closed box type motor based on an IC611 mode in embodiment 2;

FIG. 11 is a schematic view of a cross internal circulation cooling structure of a closed box type motor based on an IC616 mode in embodiment 2;

FIG. 12 is a schematic view showing a cross internal circulation cooling structure of a closed box type motor based on an IC666 mode in embodiment 2;

the reference numbers in the figures indicate:

1. the axial-flow fan comprises an outer air path fan, 2, a rotor winding, 3, a stator winding, 4, a cooler supporting plate, 5, a supporting baffle, 6, a stator core, 7, a rotor core, 8, a cold end bearing, 9, a shaft, 10, a cooler, 11, a motor, 12, a radial ventilation groove, 13, an axial ventilation hole, 14, a hot end bearing, 15, a plug, 16, a sealing pipe, 17 and an inner circulation axial-flow fan.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

The utility model relates to a seal box motor's alternately inner circulation cooling structure, this structure is applied to and has the outer closed box motor who adorns formula air-air cooler outward, and this alternately inner circulation cooling structure reforms transform two air-cooled loop structures of A, B that the inner circulation is parallelly connected among the prior art into an air-cooled inner circulation of A section and the alternately series connection of B section, makes the winding of motor and the bearing at both ends can the balanced heat dissipation.

Fig. 1 to 3 show an assembly structure of a stator, a rotor and a cooler of a closed box type motor with an externally mounted air-air cooler in the related art, and show schematic diagrams of air cooling circuits of different cooling methods (an IC611 method, an IC616 method and an IC666 method). And an outer air path fan 1 is arranged at one end of the cooler, and under the action of the outer air path fan 1, secondary cooling air flows in from the cold end of the air-air cooler and is subjected to heat exchange to discharge heat in the motor from the hot end. The middle part of the air guide pipe of the external air path of the cooler can be provided with a supporting baffle 5. For the cooling mode of IC611 and IC616, the two ends of the rotating shaft 9 are provided with the internal circulation axial fans 17 to form a power source of a primary internal circulation air path; for the IC666 cooling mode, a centrifugal fan is arranged above the middle part of the air-air cooler to form a power source of a primary internal circulation air path. The rotor is provided with evenly distributed axial ventilation holes 13, and the stator core 6 and the rotor core 7 are provided with radial ventilation grooves 12.

Fig. 4 to 6 are schematic views of the cross internal circulation cooling structure of the closed box type motor employed in the present embodiment. In this embodiment, the axial ventilation holes uniformly distributed on the rotor are equally divided into two groups a and b, one hole apart from the other hole, specifically: for the single-row vent hole arrangement structure, as shown in fig. 8, the a group of vent holes and the b group of vent holes which are axially arranged in the single-row vent hole arrangement structure are sequentially distributed at equal intervals, and for the double-row vent hole arrangement structure, as shown in fig. 9, each group of axially arranged a vent holes and b vent holes are sequentially distributed at equal intervals by taking the rotor shaft as the center. Two circles surrounded by the two layers of ventilation holes are concentric circles. The inner and outer layer ventilation holes are arranged in a symmetrical staggered manner. For the cooling mode of the IC611 and the IC616, the internal circulation axial flow fan 17 is disposed corresponding to the air intake end of one of the sets of vent holes. The air inlet inflow end of the group a of ventilation holes and the air inlet inflow end of the group b of ventilation holes are arranged oppositely. Namely, the air inlet inflow end of the group a of ventilation holes is a cold end air inlet end, the air inlet inflow end of the group b of ventilation holes is a hot end air inlet end, or the air inlet inflow end of the group a of ventilation holes is a hot end air inlet end, and the air inlet inflow end of the group b of ventilation holes is a cold end air inlet end. The group a vent holes and the group b vent holes can adopt cylindrical holes or other shapes. The following description will be given by taking the air inlet ends of the group a of ventilation holes as the cold end air inlet ends, the air inlet ends of the group b of ventilation holes as the hot end air inlet ends, and the internal circulation axial flow fan 17 and the air inlet ends of the group a of ventilation holes are arranged correspondingly as an example.

After the group a of vent holes and the group b of vent holes are arranged according to the distribution mode, all the group a of vent holes are provided with a sealing pipe 16 at the section A where the inlet air flows in, and the space between the section A of axial vent holes and the radial vent groove 12 is sealed, as shown in fig. 4, 5 and 6. And a plug 15 is arranged at the tail end of the section B of the group a of ventilation holes, so that the primary cooling medium flowing through the group a of ventilation holes of the rotor in the section A cools the rotor winding and the stator winding in the section B through the radial ventilation grooves 12 in the section B of the rotor, as shown in figures 4, 5 and 6. Similarly, all the B groups of ventilation holes are provided with a sealing pipe 16 at the section B of the inlet air inflow, so that the space between the axial ventilation hole at the section B and the radial ventilation groove 12 is sealed, as shown in figures 4, 5 and 6. And a plug 15 is arranged at the tail end of the section A of the group B of ventilation holes, so that the primary cooling medium flowing through the group B of ventilation holes of the section B cools the rotor winding and the stator winding of the section A through the radial ventilation grooves 12 in the section A of the rotor, as shown in figures 4, 5 and 6. Therefore, the A, B loops connected in parallel in the prior art are changed into the A and B cross series loops, so that the heat generated by the windings and the iron cores of the A, B two sections flows through the same loop and is subjected to cross heat exchange with the cold end and the hot end of the outer air path, and approximately the same heat dissipation effect is obtained. The heat dissipation balance of A, B sections can be basically achieved, so that the temperature rise of A, B sections of windings tends to be consistent, and the temperature of A, B end bearings tends to be consistent. The sum of the length of the sealing pipe arranged at the section A of the group a of ventilation holes and the length of the sealing pipe arranged at the section B of the group B of ventilation holes is equal to the length of the rotor core 7.

In this embodiment, as a preferable scheme, the length of the sealing pipe 16 arranged at the section a where the intake air from the ventilation hole of the a axis flows in is equal to the length of the sealing pipe 16 arranged at the section B where the intake air from the ventilation hole of the B axis flows in, so that the section A, B is a symmetrical structure, and the heat dissipation effect of the section A, B can be substantially balanced.

Example 2

The other structure of the cross internal circulation cooling structure of the closed box type motor of the present embodiment is the same as that of embodiment 1. The difference lies in that:

A. the lengths of the B-section seal pipes 16 are unequal, and the positions of the supporting baffles 5 arranged on the air guide pipe of the air path outside the cooler are consistent with the separation positions of the lengths of the A, B-section seal pipes 16, as shown in figures 10, 11 and 12. I.e., the symmetrically disposed segments A, B are changed to an asymmetrical configuration. By adjusting the length of the A, B segment of the seal tube 16, the temperature of the bearing at the A, B end can be further made uniform.

In the description of the present invention, it should be noted that the directional words such as "axial direction", "outer circle", "air inlet end" and the like indicate the direction and the positional relationship based on the directions or the positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or the element to be referred to must have a specific direction, be constructed and operated in a specific direction. For the description of the shape, for example, "circular" and "cylindrical" are also limited to the description of the shape in the drawings, and the description of these orientation words and shapes should not be construed as limiting the specific scope of the present invention.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (3)

1. A crossed internal circulation cooling structure of a closed box type motor is characterized in that a first axial ventilation hole and a second axial ventilation hole are sequentially arranged on a rotor of the closed box type motor at equal intervals by taking a rotating shaft as the center, the air inlet inflow end of the first axial ventilation hole is opposite to the air inlet inflow end of the second axial ventilation hole, the air inlet inflow ends of the first axial ventilation hole and the second axial ventilation hole are respectively provided with a sealing pipe used for realizing sealing with the radial ventilation groove, and the air inlet outflow tail ends of the first axial ventilation hole and the second axial ventilation hole are respectively provided with an air inlet outflow end used for cooling a rotor winding at the other end and a stator winding through the radial ventilation groove And (5) plugging the sub-winding.

2. The crossed internal circulation cooling structure of a closed box type motor according to claim 1, wherein the sum of the length of the sealing pipe installed at the first axial vent hole and the length of the sealing pipe installed at the second axial vent hole is the same as the length of the rotor core.

3. The cross internal circulation cooling structure of the closed box type motor as claimed in claim 1, wherein the length of the sealing pipe installed at the inlet end of the first axial vent hole is different from the length of the sealing pipe installed at the inlet end of the second axial vent hole, and the installation position of the supporting partition plate of the air guide pipe of the outer air path in the cooler is the same as the separation position of the two sealing pipes corresponding to the two axial vent holes.

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