CN108347135A - Motor cooling - Google Patents
Motor cooling Download PDFInfo
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- CN108347135A CN108347135A CN201810384070.XA CN201810384070A CN108347135A CN 108347135 A CN108347135 A CN 108347135A CN 201810384070 A CN201810384070 A CN 201810384070A CN 108347135 A CN108347135 A CN 108347135A
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- 238000001816 cooling Methods 0.000 title claims abstract description 52
- 238000009434 installation Methods 0.000 claims abstract description 20
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 238000009423 ventilation Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 14
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 230000005347 demagnetization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
本发明公开了一种电机冷却结构，包括冷却水道、内部循环风路和风道动力元件，所述冷却水道设置在电机机壳内；所述内部循环风路由电机机壳、端盖、轴承内盖、定子铁芯和转子围成；所述机壳上设置有动力元件安装腔室，所述风道动力元件安装在动力元件安装腔室中。本发明电机内部有循环风路，冷却效果好，能达到高功率密度；电机转子冷却效果好，提高了电机磁性材料的运行稳定性；电机轴承冷却效果好，提高了轴承的使用寿命；冷却风在内部循环利用，不需要在机壳上设置散热孔，因此电机可以采用全密封结构，噪声小。
The invention discloses a motor cooling structure, which includes a cooling water channel, an internal circulating air channel and an air channel power element, the cooling water channel is arranged in a motor casing; the internal circulating air is routed through a motor casing, an end cover, and a bearing inner cover , the stator core and the rotor are surrounded; the casing is provided with a power element installation chamber, and the air duct power element is installed in the power element installation chamber. The motor of the present invention has a circulating air path inside, which has good cooling effect and can achieve high power density; the cooling effect of the motor rotor is good, which improves the operation stability of the magnetic material of the motor; the cooling effect of the motor bearing is good, and the service life of the bearing is improved; the cooling air It is recycled internally, and there is no need to set cooling holes on the casing, so the motor can adopt a fully sealed structure with low noise.
Description
技术领域technical field
本发明属于电机技术领域，特别是涉及一种电机冷却结构。The invention belongs to the technical field of motors, and in particular relates to a motor cooling structure.
背景技术Background technique
永磁同步电机在进行电能转换成机械能的过程中会产生损耗，这些损耗是电机温度升高的热源，尤其对大功率永磁同步电机，损耗大，电机温升高，容易造成磁钢退磁的问题，对电机正常使用造成很大的影响。合理的设计电机冷却方式，不但能提高电机单位体积的功率密度，而且还能提高电机工作的稳定性和电机绝缘结构的寿命。The permanent magnet synchronous motor will generate losses in the process of converting electrical energy into mechanical energy. These losses are the heat source for the temperature rise of the motor. Especially for high-power permanent magnet synchronous motors, the loss is large, and the temperature of the motor increases, which is easy to cause demagnetization of the magnetic steel. The problem has a great impact on the normal use of the motor. Reasonable design of motor cooling method can not only increase the power density per unit volume of the motor, but also improve the working stability of the motor and the life of the motor insulation structure.
传统永磁同步电机冷却一般通过风道冷却电机外壳或者通过水道冷却电机外壳，然而实际应用中，永磁同步电机一般与变频器配套使用，变频器功率器件的特性决定了输出电流波形含有大量谐波，这些谐波会在永磁体上感应电涡流，对永磁体发热产生影响。传统电机单一冷却方式仅仅对电机的定子部分有较好的冷却，冷却效果差，如果不对永磁电机的转子进行冷却，存在较大的高温退磁风险，进而影响永磁同步电机的使用。Traditional permanent magnet synchronous motor cooling generally cools the motor casing through air ducts or through water channels. However, in practical applications, permanent magnet synchronous motors are generally used in conjunction with inverters. The characteristics of inverter power devices determine that the output current waveform contains a large number of harmonics. Waves, these harmonics will induce eddy currents on the permanent magnets, which will affect the heating of the permanent magnets. The traditional single cooling method of the motor only has a good cooling effect on the stator part of the motor, and the cooling effect is poor. If the rotor of the permanent magnet motor is not cooled, there is a greater risk of high temperature demagnetization, which in turn affects the use of the permanent magnet synchronous motor.
因此，研发新结构冷却方式，提升冷却效率，改善电机冷却效果，提高永磁同步电机功率密度有重大意义。Therefore, it is of great significance to develop new structural cooling methods, improve cooling efficiency, improve motor cooling effect, and increase the power density of permanent magnet synchronous motors.
发明内容Contents of the invention
针对以上现有技术的不足，本发明的目的在于提供一种电机冷却结构，改善电机冷却效果，延长电机的使用寿命。In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a motor cooling structure to improve the cooling effect of the motor and prolong the service life of the motor.
为达到上述目的，本发明的技术方案是：For achieving the above object, technical scheme of the present invention is:
一种电机冷却结构，包括：A motor cooling structure, comprising:
冷却水道，所述冷却水道设置在电机机壳内；A cooling water channel, the cooling water channel is arranged in the motor casing;
内部循环风路，所述内部循环风路由电机机壳、端盖、轴承内盖、定子铁芯和转子围成；An internal circulating air path, the internal circulating air is surrounded by the motor casing, end cover, bearing inner cover, stator core and rotor;
风道动力元件，所述机壳上设置有动力元件安装腔室，所述风道动力元件安装在动力元件安装腔室中；所述动力元件安装腔室开设有进风口和出风口，所述内部循环风路具有循环风路出气口和循环风路进气口，所述循环风路出气口与动力元件安装腔室的进风口连通，所述循环风路进气口与动力元件安装腔室的出风口连通。The air duct power element is provided with a power element installation chamber on the casing, and the air duct power element is installed in the power element installation chamber; the power element installation chamber is provided with an air inlet and an air outlet, and the The internal circulation air path has an air outlet of the air circulation path and an air inlet of the air circulation path. The air outlet of the air circulation path communicates with the air inlet of the power element installation chamber. The air outlet is connected.
本发明在电机机壳内设置有冷却水道，大部分定子绕组和铁芯产生的损耗通过水道内壁与冷却水换热，定子绕组端部产生的损耗、轴承摩擦损耗、磁钢涡流损耗通过内部循环风路进行冷却，这样在冷却水道和内部循环风路的共同作用下，电机的冷却效率大大提升，改善了电机的冷却效果，不但能提高电机单位体积的功率密，而且还能提高电机工作的稳定性和电机绝缘结构的寿命。In the present invention, a cooling water channel is arranged in the motor casing, most of the losses generated by the stator winding and the iron core exchange heat with the cooling water through the inner wall of the water channel, and the losses generated at the end of the stator winding, bearing friction loss, and magnetic steel eddy current loss are passed through the internal circulation In this way, under the joint action of the cooling water channel and the internal circulating air channel, the cooling efficiency of the motor is greatly improved, and the cooling effect of the motor is improved. It can not only increase the power density per unit volume of the motor, but also improve the working efficiency of the motor. Stability and longevity of motor insulation structures.
进一步，所述转子为空心结构，并且转子的两端开设有与其内部通道连通的径向通风孔；所述电机内部设置有两路循环风路，其中一路从定子铁芯与转子之间的间隙流过，另一路从空心转子流过。这样设计的目的使得转子的内外都可以得到冷却，提高了对永磁电机转子的冷却效果，避免了温度过高而造成的退磁风险，保证了永磁电机的使用寿命。Further, the rotor is a hollow structure, and the two ends of the rotor are provided with radial ventilation holes communicating with its internal passage; the motor is provided with two circulating air paths, one of which is from the gap between the stator core and the rotor. flow through, and the other way flows through the hollow rotor. The purpose of this design is to cool the inside and outside of the rotor, improve the cooling effect on the rotor of the permanent magnet motor, avoid the risk of demagnetization caused by excessive temperature, and ensure the service life of the permanent magnet motor.
进一步，所述动力元件安装腔室的进风口处设置有风路导流罩。导流罩为收口状，主要作用是对内部循环风进行引流，使得内部循环风能够在动力元件的作用下更好地循环利用。Further, an air duct shroud is provided at the air inlet of the power element installation chamber. The shroud is closed, and its main function is to drain the internal circulating air, so that the internal circulating air can be better recycled under the action of the power element.
进一步，所述内部循环风路内设置有隔板。隔板的主要作用是将内部循环风路隔断，保证内部循环风路不产生回流。Further, a partition is arranged in the internal circulation air passage. The main function of the partition is to cut off the internal circulation air path to ensure that the internal circulation air path does not generate backflow.
进一步，所述内部循环风路内靠近循环风路进气口处设置有换热器。换热器的主要作用是对冷却风进行换热，换热后的冷却风再次对电机内部零部件进行散热，如此循环利用。当然，换热器最好是设置在电机冷却水道的外壳处，使得结构更加紧凑。Further, a heat exchanger is provided in the internal circulating air passage near the air inlet of the circulating air passage. The main function of the heat exchanger is to exchange heat for the cooling air, and the cooled air after heat exchange will dissipate heat for the internal parts of the motor again, so that it can be recycled. Of course, the heat exchanger is preferably arranged at the casing of the motor cooling water channel, so that the structure is more compact.
进一步，所述换热器上设置有若干个沿风路循环流动方向布置的散热片。这样设计的目的主要是考虑两方面因素，一方面因素是保证足够的散热面积，另一方面因素还要考虑对电机内部风路风阻的影响。Further, the heat exchanger is provided with several cooling fins arranged along the circulation flow direction of the air passage. The purpose of this design is mainly to consider two factors, one factor is to ensure a sufficient heat dissipation area, and the other factor is to consider the impact on the wind resistance of the internal wind path of the motor.
进一步，所述转子由中间轴和设置在中间轴两端的端轴组成，所述中间轴为空心结构，且中间轴的表面粘贴有磁钢；所述端轴的一端具有空心段，所述空心段的部分插接到中间轴的端部内，且空心段与中间轴的内部通道连通；空心段的其余部分伸出到中间轴外，并且伸出部分上设置有径向通风孔。Further, the rotor is composed of an intermediate shaft and end shafts arranged at both ends of the intermediate shaft, the intermediate shaft is a hollow structure, and the surface of the intermediate shaft is pasted with magnetic steel; one end of the end shaft has a hollow section, and the hollow Part of the section is plugged into the end of the intermediate shaft, and the hollow section communicates with the inner channel of the intermediate shaft; the rest of the hollow section protrudes out of the intermediate shaft, and the protruding part is provided with radial ventilation holes.
转子采用分段设计，中间轴为空心轴，端轴的部分空心，利用端轴空心部分的径向通风孔来形成通路，实心部分用于轴承安装，更好地保证了转子两端轴承部位的强度。The rotor adopts a segmented design, the intermediate shaft is a hollow shaft, the part of the end shaft is hollow, and the radial ventilation holes in the hollow part of the end shaft are used to form a passage, and the solid part is used for bearing installation, which better ensures the bearings at both ends of the rotor. strength.
本发明的有益效果在于：The beneficial effects of the present invention are:
1、电机内部有循环风路，冷却效果好，能达到高功率密度。1. There is a circulating air path inside the motor, which has a good cooling effect and can achieve high power density.
2、电机转子冷却效果好，提高了电机磁性材料的运行稳定性。2. The cooling effect of the motor rotor is good, which improves the operation stability of the motor magnetic material.
3、电机轴承冷却效果好，提高了轴承的使用寿命。3. The cooling effect of the motor bearing is good, which improves the service life of the bearing.
4、冷却风在内部循环利用，不需要在机壳上设置散热孔，因此电机可以采用全密封结构，噪声小。4. The cooling air is recycled internally, and there is no need to set cooling holes on the casing, so the motor can adopt a fully sealed structure with low noise.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的其中两幅，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only of the present invention. For two of them, for a person of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.
图1为本发明实施例电机冷却结构的剖面图。Fig. 1 is a cross-sectional view of a motor cooling structure according to an embodiment of the present invention.
图2为在图1的基础上指出冷却水道和内部循环风路的原理图。Fig. 2 is a schematic diagram pointing out the cooling water channel and the internal circulation air path on the basis of Fig. 1 .
图3为本发明实施例的换热器结构图。Fig. 3 is a structural diagram of a heat exchanger according to an embodiment of the present invention.
图4为本发明实施例的转子结构图。Fig. 4 is a structural diagram of a rotor according to an embodiment of the present invention.
具体实施方式Detailed ways
下面将结合附图，对本发明中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的较佳实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
实施例Example
如图1和图2所示，一种电机冷却结构，包括：As shown in Figure 1 and Figure 2, a motor cooling structure includes:
冷却水道16，所述冷却水道16设置在电机机壳7内，具体实施时，可以在电机机壳7内设置水道外壁14和水道内壁15，水道外壁14与水道内壁15之间的间隙构成冷却水道16；Cooling water channel 16, described cooling water channel 16 is arranged in the motor housing 7, during specific implementation, can be provided with water channel outer wall 14 and water channel inner wall 15 in motor housing 7, the gap between water channel outer wall 14 and water channel inner wall 15 constitutes cooling Waterway 16;
内部循环风路，所述内部循环风路由电机机壳7、前端盖1、前轴承内盖2、带绕组定子铁芯10、转子9、后端盖11和后轴承内盖12围成；An internal circulation air path, the internal circulation air is surrounded by the motor casing 7, the front end cover 1, the front bearing inner cover 2, the stator core 10 with windings, the rotor 9, the rear end cover 11 and the rear bearing inner cover 12;
风道动力元件，风道动力元件采用离心风扇4，其作用主要是对冷却风产生动力，使冷却风得以在内部循环风路内流动，从而对电机内部零部件进行冷却；为了提高内部循环风道内的压力以及降低风扇噪声，离心风扇4可以选择多翼型离心风扇；机壳7上设置有动力元件安装腔室，动力元件安装腔室可以是由带蜗壳的离心风扇座3和盖板组成，带蜗壳的离心风扇座3采用螺栓固定等方式连接在机壳7上，盖板连接在带蜗壳的离心风扇座3上，从而构成完整的腔室，离心风扇4安装在该腔室内，通过风扇固定螺钉5连接在离心风扇座3顶部的盖板上；动力元件安装腔室开设有进风口和出风口，所述内部循环风路具有循环风路出气口和循环风路进气口，所述循环风路出气口与动力元件安装腔室的进风口连通，所述循环风路进气口与动力元件安装腔室的出风口连通。The air duct power element, the air duct power element adopts the centrifugal fan 4, its function is mainly to generate power for the cooling air, so that the cooling air can flow in the internal circulation air path, thereby cooling the internal parts of the motor; in order to improve the internal circulation air The centrifugal fan 4 can choose a multi-blade centrifugal fan; the casing 7 is provided with a power element installation chamber, and the power element installation chamber can be composed of a centrifugal fan seat 3 with a volute and a cover plate Composition, the centrifugal fan seat 3 with volute is connected to the casing 7 by means of bolt fixing, the cover plate is connected to the centrifugal fan seat 3 with volute, thus forming a complete chamber, and the centrifugal fan 4 is installed in the chamber In the room, it is connected to the cover plate on the top of the centrifugal fan base 3 through the fan fixing screw 5; the power element installation chamber is provided with an air inlet and an air outlet, and the internal circulation air path has an air circulation air outlet and an air circulation air intake. The air outlet of the circulating air path communicates with the air inlet of the power element installation chamber, and the air inlet of the circulating air path communicates with the air outlet of the power element installation chamber.
电机工作时，大部分定子绕组和铁芯产生的损耗通过水道内壁15与冷却水换热，定子绕组端部产生的损耗、轴承摩擦损耗、磁钢涡流损耗通过内部循环风路进行冷却，这样在冷却水道和内部循环风路的共同作用下，电机的冷却效率大大提升，改善了电机的冷却效果，不但能提高电机单位体积的功率密，而且还能提高电机工作的稳定性和电机绝缘结构的寿命。When the motor is working, most of the losses generated by the stator windings and iron core exchange heat with the cooling water through the inner wall 15 of the water channel, and the losses generated at the ends of the stator windings, bearing friction losses, and magnetic steel eddy current losses are cooled through the internal circulation air path, so that the Under the combined effect of the cooling water channel and the internal circulating air circuit, the cooling efficiency of the motor is greatly improved, which improves the cooling effect of the motor, not only improves the power density per unit volume of the motor, but also improves the working stability of the motor and the insulation structure of the motor. life.
在本实施例中，定子铁芯10与转子9之间留有气隙，转子9为空心结构，并且转子9的两端开设有与其内部通道连通的径向通风孔，这样设计的目的是可以在电机内部形成两路循环风路，分别是第一冷却风路17和第二冷却风路18，其中，第一冷却风路17从定子铁芯10与转子9之间的气隙流过，第二冷却风路18从空心转子流过。这样设计的目的使得转子9的内外都可以得到冷却，提高了对永磁电机转子的冷却效果，避免了温度过高而造成的退磁风险，保证了永磁电机的使用寿命。In this embodiment, there is an air gap between the stator core 10 and the rotor 9, the rotor 9 is a hollow structure, and the two ends of the rotor 9 are provided with radial ventilation holes communicating with its internal passage, the purpose of this design is to Two circulating air paths are formed inside the motor, namely the first cooling air path 17 and the second cooling air path 18, wherein the first cooling air path 17 flows through the air gap between the stator core 10 and the rotor 9, The second cooling air passage 18 flows through the hollow rotor. The purpose of this design is to cool the inside and outside of the rotor 9, improve the cooling effect on the rotor of the permanent magnet motor, avoid the risk of demagnetization caused by excessive temperature, and ensure the service life of the permanent magnet motor.
在本实施例中，所述动力元件安装腔室的进风口处设置有风路导流罩6，风路导流罩6为收口状，主要作用是对内部循环风进行引流，使得内部循环风能够在动力元件的作用下更好地循环利用。In this embodiment, an air guide cover 6 is provided at the air inlet of the power element installation chamber. The air guide cover 6 is closed, and its main function is to drain the internal circulating air so that the internal circulating air It can be better recycled under the action of power components.
在本实施例中，所述内部循环风路内设置有隔板13。隔板13的主要作用是将内部循环风路隔断，保证内部循环风路不产生回流。In this embodiment, a partition 13 is arranged in the internal circulation air passage. The main function of the partition 13 is to cut off the internal circulation air path to ensure that the internal circulation air path does not generate backflow.
在本实施例中，所述内部循环风路内靠近循环风路进气口处设置有换热器8。换热器8的主要作用是对冷却风进行换热，换热后的冷却风再次对电机内部零部件进行散热，如此循环利用。当然，换热器8最好是设置在电机冷却水道16的外壳处，使得结构更加紧凑。In this embodiment, a heat exchanger 8 is arranged in the internal circulation air passage near the air inlet of the circulation air passage. The main function of the heat exchanger 8 is to exchange heat with the cooling air, and the cooled air after the heat exchange dissipates heat to the internal parts of the motor again, so that it can be recycled. Certainly, the heat exchanger 8 is preferably arranged at the casing of the motor cooling water channel 16, so that the structure is more compact.
如图3所示，在本实施例中，所述换热器8上设置有若干个沿风路循环流动方向布置的散热片。这样设计的目的主要是考虑两方面因素，一方面因素是保证足够的散热面积，另一方面因素还要考虑对电机内部风路风阻的影响。As shown in FIG. 3 , in this embodiment, the heat exchanger 8 is provided with several cooling fins arranged along the circulation flow direction of the air passage. The purpose of this design is mainly to consider two factors, one factor is to ensure a sufficient heat dissipation area, and the other factor is to consider the impact on the wind resistance of the internal wind path of the motor.
如图4所示，在本实施例中，所述转子9由中间轴91和设置在中间轴91两端的端轴93组成，所述中间轴91为空心结构，且中间轴91的表面粘贴有磁钢92；所述端轴93的一端具有空心段，所述空心段的部分采用过盈配合的方式插接到中间轴91的端部内(插接部分设置有止口)，且空心段与中间轴91的内部通道连通；空心段的其余部分伸出到中间轴91外，并且伸出部分上设置有多个径向通风孔。也就是说，转子9采用分段设计，中间轴91为空心轴，端轴93的部分空心，利用端轴93空心部分的径向通风孔来形成完整风路，实心部分用于轴承安装，更好地保证了转子两端轴承部位的强度。As shown in Figure 4, in this embodiment, the rotor 9 is composed of an intermediate shaft 91 and end shafts 93 arranged at both ends of the intermediate shaft 91, the intermediate shaft 91 is a hollow structure, and the surface of the intermediate shaft 91 is pasted with Magnetic steel 92; one end of the end shaft 93 has a hollow section, and the part of the hollow section is inserted into the end of the intermediate shaft 91 in an interference fit mode (the plugging part is provided with a notch), and the hollow section and The internal channel of the intermediate shaft 91 is communicated; the remaining part of the hollow section protrudes out of the intermediate shaft 91, and a plurality of radial ventilation holes are arranged on the protruding part. That is to say, the rotor 9 adopts a segmented design, the intermediate shaft 91 is a hollow shaft, the part of the end shaft 93 is hollow, and the radial ventilation holes in the hollow part of the end shaft 93 are used to form a complete air path, and the solid part is used for bearing installation. The strength of the bearing parts at both ends of the rotor is well guaranteed.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.
Claims (7)
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Application publication date: 20180731 |