Motor and clothes treatment device
阅读说明:本技术 电机及衣物处理装置 (Motor and clothes treatment device ) 是由 冯益民 张小文 王永生 于 2018-08-20 设计创作,主要内容包括:本发明提供了一种电机及衣物处理装置,电机包括:转子组件,转子组件包括转子铁芯和永磁体,转子铁芯上设置有一端开口的安装腔,永磁体安装在安装腔内,永磁体上形成有多个磁极;定子组件,安装在安装腔内,且永磁体位于定子组件与安装腔的内侧壁之间,定子组件包括定子铁芯和电枢绕组,定子铁芯上设置有多个定子齿,多个定子齿之间形成12n个线槽,n为大于等于1的整数,电枢绕组绕设在多个定子齿上;线槽的数量与磁极的数量之间的比值为12:13。该方案通过采用12:13的线槽与磁极组合能够在继承分数槽结构的优点,降低电机的制造成本的同时,有效降低电枢磁场产生的谐波含量,从而可降低电机在高速运行时的振动和噪音。(The invention provides a motor and a clothes processing device, wherein the motor comprises: the rotor assembly comprises a rotor core and a permanent magnet, wherein the rotor core is provided with an installation cavity with an opening at one end, the permanent magnet is installed in the installation cavity, and a plurality of magnetic poles are formed on the permanent magnet; the stator assembly is arranged in the installation cavity, the permanent magnet is positioned between the stator assembly and the inner side wall of the installation cavity, the stator assembly comprises a stator core and an armature winding, a plurality of stator teeth are arranged on the stator core, 12n wire grooves are formed among the plurality of stator teeth, n is an integer greater than or equal to 1, and the armature winding is wound on the plurality of stator teeth; the ratio of the number of the wire grooves to the number of the magnetic poles is 12: 13. the scheme adopts a scheme that 12: the combination of the wire slot and the magnetic pole of the motor 13 can inherit the advantages of a fractional slot structure, reduce the manufacturing cost of the motor and effectively reduce the harmonic content generated by an armature magnetic field, thereby reducing the vibration and noise of the motor during high-speed operation.)
1. An electric machine, comprising:
the rotor assembly (1) comprises a rotor core (12) and a permanent magnet, wherein an installation cavity with an opening at one end is formed in the rotor core (12), the permanent magnet is installed in the installation cavity, and a plurality of magnetic poles are formed on the permanent magnet;
the stator assembly (2) is installed in the installation cavity, the permanent magnet is located between the stator assembly (2) and the inner side wall of the installation cavity, the stator assembly (2) comprises a stator core (22) and an armature winding (24), a plurality of stator teeth (224) are arranged on the stator core (22), 12n wire slots (226) are formed among the plurality of stator teeth (224), wherein n is an integer greater than or equal to 1, and the armature winding (24) is wound on the plurality of stator teeth (224);
wherein the ratio between the number of wire slots (226) and the number of poles is 12: 13.
2. the electric machine of claim 1,
the permanent magnet is composed of a plurality of permanent magnets (14) arranged at intervals along the circumferential direction of the rotor core (12), each permanent magnet (14) can form a magnetic pole, and the number of the permanent magnets (14) is consistent with that of the magnetic poles; or
The permanent magnet is an annular body with a plurality of magnetic poles.
3. The electric machine according to claim 1, characterized in that the stator core (22) comprises:
a stator ring (222);
the stator teeth (224) are arranged on the outer side wall of the stator ring (222), and the stator teeth (224) are distributed at equal intervals along the circumferential direction of the stator ring (222);
any two adjacent stator teeth (224) and the side wall of the stator ring (222) can enclose the wire slot (226).
4. The electric machine of claim 3,
the stator ring (222) and the plurality of stator teeth (224) are of an integral structure; and/or
The inner diameter of the stator ring (222) is d, wherein d is more than or equal to 120mm and less than or equal to 250 mm; and/or
The width between the inner diameter of the stator ring (222) and the outer diameter of the stator ring (222) is t, wherein t is more than or equal to 5mm and less than or equal to 15 mm; and/or
The thickness of the stator ring (222) in the axial direction of the stator ring (222) is 15mm or more and 40mm or less.
5. The electric machine according to any of claims 1 to 4,
the depth of the wire groove (226) is more than or equal to 10mm and less than or equal to 45 mm; and/or
The width of the slot opening of the slot (226) is more than or equal to 5mm and less than or equal to 15 mm; and/or
The width of the permanent magnet in the radial direction of the rotor iron core (12) is more than or equal to 4mm and less than or equal to 8 mm; and/or
The thickness of the permanent magnet in the axial direction of the rotor core (12) is greater than or equal to 15mm and less than or equal to 50 mm.
6. The electric machine according to any of claims 1 to 4,
the motor is a permanent magnet synchronous motor; and/or
The number of the wire grooves (226) is 24, and the number of the magnetic poles is 26.
7. The electric machine of any one of claims 1 to 4, further comprising:
the connector (3) is arranged on the rotor assembly (1) or the stator assembly (2) and can be connected with a power supply to supply power to the armature winding (24);
and the output shaft is arranged on the rotor iron core (12) and can rotate under the action of the rotor iron core (12).
8. The electric machine of claim 7,
the mounting cavity is characterized in that a mounting hole is formed in the bottom wall of the mounting cavity, the output shaft is located in the mounting hole through key connection, and the output shaft is further mounted on the rotor core (12) through a nut.
9. A laundry treating apparatus, comprising the motor according to any one of claims 1 to 8.
10. The laundry treating apparatus according to claim 9,
the laundry treating apparatus further comprises a washing container directly in driving connection with the motor; and/or
The laundry treating apparatus is a washing machine or a dryer.
Technical Field
The present invention relates to the field of home appliances, and more particularly, to a motor and a laundry treating apparatus.
Background
At present, the slot poles in the motor are mostly designed by taking 3 slots and 4 poles as units, and the matching of the number of the slot poles has the disadvantages of higher harmonic content in an armature reaction magnetic field, larger torque fluctuation of the motor during high-speed running, more vibration and larger noise.
Therefore, how to design a motor capable of reducing the harmonic content generated in the armature reaction magnetic field, thereby reducing the vibration and noise of the motor during high-speed operation, is a problem to be solved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, it is an object of the invention to provide an electric machine.
Another object of the present invention is to provide a laundry treating apparatus including the motor.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an electric machine, including: the rotor assembly comprises a rotor core and a permanent magnet, an installation cavity with an opening at one end is formed in the rotor core, the permanent magnet is installed in the installation cavity, and a plurality of magnetic poles are formed on the permanent magnet; the stator assembly is installed in the installation cavity, the permanent magnet is located between the stator assembly and the inner side wall of the installation cavity, the stator assembly comprises a stator core and an armature winding, a plurality of stator teeth are arranged on the stator core, 12n wire grooves are formed among the plurality of stator teeth, n is an integer greater than or equal to 1, and the armature winding is wound on the plurality of stator teeth; wherein, the ratio between the number of the wire grooves and the number of the magnetic poles is 12: 13.
the motor provided by the embodiment of the invention comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotor core and a permanent magnet arranged on the rotor core, and meanwhile, an installation cavity with an opening at one end is arranged on the rotor core, so that the permanent magnet and the stator assembly can be arranged in the rotor core. And the stator assembly comprises a stator core and an armature winding, wherein the stator core and a plurality of stator teeth are mainly used for forming a plurality of wire slots so as to realize the fixation of the armature winding. And the armature winding can carry out armature reaction with the permanent magnet after the circular telegram to just can produce the magnetic field, so that the rotor subassembly rotates, just so can drive other objects through the rotation of rotor subassembly and rotate. And this kind of motor, the rotor subassembly is installed outside stator module, can form the motor structure of outer rotor internal stator like this, and this kind of outer rotor motor compares in inner rotor motor, and its moment is bigger, consequently, can provide better power, and then can improve the load capacity of motor under high speed. Here, the number of the wire grooves is 12n, and n is an integer greater than or equal to 1, that is, the number of the wire grooves is an integer multiple of 12, such as 12, 24, or 36, and the ratio of the number of the wire grooves to the number of the magnetic poles is 12: for example, 12 slots are provided, the number of the magnetic poles is 13, or 24 slots are provided, the number of the magnetic poles is 26, or 36 slots are provided, the number of the magnetic poles is 39, and the like, and in the arrangement, the number of the slots is an integral multiple of 12, and 12 is the minimum common divisor of the number of the slots in 3 slots and 4 poles and the number of the poles, and experiments show that the number of the magnetic slots can be matched to effectively reduce the harmonic content generated by an armature magnetic field, so that the torque fluctuation of the motor can be reduced, and the vibration and the noise of the motor during high-speed operation can be reduced. Further 12: the combination of the wire groove and the magnetic pole of the motor 13 also belongs to a fractional groove structure, and the fractional groove structure can reduce the manufacturing cost of the motor, so that the arrangement can also reduce the harmonic content generated by an armature magnetic field, reduce the vibration and noise of the motor in high-speed operation, and inherit the advantages of the fractional groove structure so as to reduce the manufacturing cost of the motor.
In addition, the motor provided according to the above embodiment of the present invention has the following additional technical features:
in any one of the above technical solutions, preferably, the permanent magnet is composed of a plurality of permanent magnet blocks arranged at intervals along a circumferential direction of the rotor core, each permanent magnet block can form a magnetic pole, and the number of the permanent magnet blocks is consistent with the number of the magnetic poles; or the permanent magnet is an annular body with a plurality of magnetic poles.
In these technical schemes, can be preferred to set up the permanent magnet into a plurality of permanent magnetism pieces that set up alone, like this a plurality of magnetic poles of formation of a plurality of permanent magnetism pieces of accessible, specifically speaking, can be the annular interval distribution with a plurality of permanent magnetism pieces, just so can form the magnetic pole number the same with the quantity of permanent magnetism piece, and this kind of setting only needs to correspond and produces a plurality of magnetic poles that can be convenient fast of a plurality of magnetic blocks of equidimension to make the processing degree of difficulty of product lower.
Of course, in other schemes, the permanent magnet may be arranged into an annular body, and then a plurality of magnetic poles may be formed by reasonably arranging the magnetic field inside the annular body, and this structure may make the processing of the permanent magnet difficult, so that it may be preferable to arrange the permanent magnet into a plurality of permanent magnet blocks arranged separately.
In any one of the above technical solutions, preferably, an installation groove is provided on an inner side wall of the installation cavity, and the permanent magnet is installed in the installation groove.
In these technical scheme, can prefer the structure setting corresponding mounting groove that corresponds the permanent magnet on rotor core's the inside wall, just so can correspond the permanent magnet and install in the mounting groove to realize the installation between permanent magnet and the rotor core simply fast.
In any one of the above technical solutions, preferably, the stator core includes: a stator ring; the stator teeth are arranged on the outer side wall of the stator ring, and are distributed at equal intervals along the circumferential direction of the stator ring; and any two adjacent stator teeth and the side wall of the stator ring can enclose the wire slot.
Among these technical scheme, can be preferred set the stator core to a structure including stator ring and a plurality of stator tooth, and the stator ring is because being the annular, consequently, can form the through-hole that wears to establish such as the output shaft of a power supply machine in the middle part, like this alright pass the output shaft by stator module's inside to just make the output shaft still can set up in the middle part of motor, therefore can make the structure of motor more reasonable. In addition, the stator ring is the annular, when setting up the output shaft, can avoid the output shaft of motor and stator module to take place to interfere to it is more convenient to make the setting of output shaft. And the stator teeth are used to form slots and to secure the coils so that they can be wound onto the stator core to form an armature winding.
In any of the above technical solutions, preferably, the stator ring and the plurality of stator teeth are of an integrated structure.
In these technical scheme, stator ring and a plurality of stator tooth are preferred integral type structure, because the mechanical properties of integral type structure is good, therefore can ensure the joint strength between stator ring and a plurality of stator tooth, in addition, still can make stator ring and a plurality of stator tooth an organic whole, batch production to improve the production efficiency of product, reduce the production and processing cost of product. Of course, the stator ring and the plurality of stator teeth can also be of a split structure, namely a detachable structure.
Preferably, a stator core can be formed by splicing and superposing a plurality of punching sheet units. Therefore, the stator core can be processed more simply and conveniently.
In any of the above technical solutions, preferably, the inner diameter of the stator ring is d, wherein d is greater than or equal to 120mm and less than or equal to 250 mm; and/or the width between the inner diameter of the stator ring and the outer diameter of the stator ring is t, wherein t is more than or equal to 5mm and less than or equal to 15 mm.
In the technical schemes, the inner diameter d of the stator ring is reasonably limited, so that the hole inside the stator core is moderate, and the width t between the inner diameter of the stator ring and the outer diameter of the stator ring is limited, so that the ring width of the stator core is proper. The size and the structure of the stator core can be more reasonable by limiting the inner diameter d between 120mm and 250mm and limiting the width t of the stator ring between 5mm and 15mm, so that the overall structure of the motor can be more reasonable and compact, the rotating speed, the efficiency and the like of the motor can be optimal, and the overall performance of the motor can be improved.
In any of the above technical solutions, preferably, a thickness of the stator ring in an axial direction of the stator ring is greater than or equal to 15mm and less than or equal to 40 mm. The arrangement enables the thickness of the stator ring to be moderate, so that the condition that the whole thickness of the motor is too thick or too thin can be avoided. In addition, the arrangement can ensure that the rotating speed, the efficiency and the like of the motor can reach the best, thereby ensuring the overall performance of the motor.
In any of the above technical solutions, preferably, the depth of the wire groove is greater than or equal to 10mm and less than or equal to 45 mm; and/or the width of the slot of the wire slot is more than or equal to 5mm and less than or equal to 15 mm.
In the technical schemes, the groove width of the wire groove is limited to 5-15 mm, so that the groove width of the wire groove is proper, the wire can be prevented from being separated from the wire groove, and the problem of poor wire winding caused by too small groove width can be avoided. The depth of the wire groove can reasonably limit the thickness of the armature winding, and the depth of the wire groove is set between 10mm and 45mm, so that the torque, the rotating speed, the efficiency and the like of the motor can be optimal, the overall performance of the motor can be improved, and the vibration and the noise of a product can be reduced.
In any one of the above technical solutions, preferably, a width of the permanent magnet in a radial direction of the rotor core is greater than or equal to 15mm and less than or equal to 50 mm; and/or the thickness of the permanent magnet in the axial direction of the rotor core is greater than or equal to 4mm and less than or equal to 8 mm.
In the technical schemes, the thickness and the width of the permanent magnet are reasonably limited, so that the strength of the magnetic pole can be limited, the strength of armature reaction can be reasonably limited, and the load capacity and other capacities of the motor are influenced. And through setting the thickness and the width of the permanent magnet in the above-mentioned scope, can make the rotational speed, efficiency of motor etc. all can reach the best to can improve the wholeness ability of motor.
Preferably, the motor is a permanent magnet synchronous motor.
In any one of the above technical solutions, preferably, the number of the wire grooves is 24, and the number of the magnetic poles is 26.
In these technical solutions, the number of the wire grooves is preferably 24, and the number of the magnetic poles is preferably 26, so that it can be ensured that the ratio of the number of the wire grooves to the number of the magnetic poles is 12: 13, the number of the wire grooves and the number of the magnetic poles are moderate, so that the overall performance of the motor can be optimal. Of course, in other schemes, the number of the wire grooves and the magnetic poles can be other values.
Wherein, preferably, the motor is a motor in a laundry treatment apparatus, such as a motor in a washing machine or a dryer.
In any one of the above technical solutions, preferably, the motor further includes: the connector is arranged on the rotor assembly or the stator assembly and can be connected with a power supply to supply power to the armature winding; and the output shaft is arranged on the rotor core and can rotate under the action of the rotor core.
In these technical schemes, can realize through this connector that the electricity between power such as commercial power and the armature winding is connected, just so can utilize commercial power etc. to supply power for armature winding or other spare parts. The output shaft is provided so that the rotational energy of the rotor can be output through the output shaft, and thus the driving force of the motor can be output through the output shaft, so that other objects (such as a washing tub) can be driven to rotate through the output shaft.
Preferably, the output shaft is detachably connected to the rotor core, so that the output shaft can be detached from the motor alone. Of course, the output shaft and the rotor core can be of an integrated structure.
In any one of the above technical solutions, preferably, a mounting hole is formed in the bottom wall of the mounting cavity, the output shaft is located in the mounting hole through a key connection, and the output shaft is further mounted on the rotor core through a nut.
In these technical solutions, it may be preferable to position and mount the output shaft and the rotor core first through a key, and then the output shaft may be finally mounted on the rotor core through a nut or the like. Of course, the output shaft and the rotor core may be connected by other structures.
Preferably, a through hole is formed in the middle of the stator core, one end of the output shaft is connected with the bottom wall of the mounting cavity, the other end of the output shaft is inserted into and extends out of the through hole, and then one end of the output shaft extending out of the through hole is in driving connection with a washing container and the like.
Embodiments of the second aspect of the invention provide a clothes treatment device, which comprises the motor provided in any one of the embodiments of the first aspect.
According to the clothes treatment device provided by the embodiment of the invention, the motor provided by any one of the embodiments of the first aspect is provided, so that the clothes treatment device provided by the embodiment of the invention has all the beneficial effects of the motor provided by any one of the embodiments of the first aspect, which are not listed here.
In the above technical solution, preferably, the laundry treatment apparatus further includes a washing container, and the washing container is directly connected to the motor in a driving manner.
In the technical schemes, when the washing machine is used specifically, the motor can be directly connected with washing containers such as a barrel body or a cylinder body of the washing machine, so that the washing containers such as the washing barrel can be directly driven to rotate through the motor.
In any of the above technical solutions, preferably, the laundry treating apparatus further includes a flange for connecting the washing container and a stator core of the motor.
In the technical schemes, when the rotor assembly is installed, a flange plate can be preferably arranged between the stator core and the washing container, so that the flange plate, the washing container and the stator core can be installed together through screws and the like, and the stator core can be finally fixed on the washing container by the arrangement, so that the installation precision between the stator and the rotor can be reasonably limited, and the air gap between the stator and the rotor is good after the rotor assembly is installed.
Among them, it is preferable that the laundry treating apparatus is a washing machine or a drying machine, and of course, the laundry treating apparatus may be other products besides the washing machine and the drying machine.
Additional aspects and advantages in accordance with the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a motor provided according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a stator core of an electric machine provided according to an embodiment of the present invention;
fig. 3 is a partial structural schematic view of a laundry treating apparatus according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
1 rotor assembly, 12 rotor core, 14 permanent magnet, 2 stator assembly, 22 stator core, 222 stator ring, 224 stator teeth, 226 slot, 24 armature winding, 3 connector and 4 flange.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
A motor and a laundry treating apparatus provided according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
As shown in fig. 1 to 3, in an embodiment of a first aspect of the present invention, an electric machine is provided, where the electric machine includes a
according to the embodiment of the invention, the motor comprises a
In any of the above embodiments, preferably, as shown in fig. 1 and 3, the permanent magnet is composed of a plurality of permanent magnet blocks 14 arranged at intervals along the circumferential direction of the
In these embodiments, it is preferable that the permanent magnet is configured as a plurality of permanent magnet blocks 14, so that a plurality of magnetic poles can be formed by the plurality of permanent magnet blocks 14, specifically, for example, the plurality of permanent magnet blocks 14 are distributed in an annular interval, so that the number of magnetic poles equal to the number of permanent magnet blocks 14 can be formed, and in this configuration, the plurality of magnetic poles can be formed quickly and conveniently only by correspondingly producing a plurality of magnetic blocks with the same size, so that the difficulty in processing the product is low.
Of course, in other solutions (not shown in the drawings), the permanent magnet may be arranged as a ring, and then a plurality of magnetic poles can be formed by reasonably arranging the magnetic field inside the ring, and this structure makes the processing of the permanent magnet difficult, so it is preferable to arrange the permanent magnet as a plurality of permanent magnet blocks 14 arranged separately.
In any of the above embodiments, preferably, the inner side wall of the installation cavity is provided with an installation groove, and the permanent magnet is installed in the installation groove.
In these embodiments, it is preferable to provide a corresponding mounting groove on the inner sidewall of
In any of the above embodiments, preferably, as shown in fig. 1 and 2, the
In these embodiments, it is preferable that the
In any of the above embodiments, preferably, as shown in fig. 1 and 2, the
In the embodiments, the
Preferably, a
In any of the above embodiments, preferably, as shown in FIG. 2, the inner diameter of the
In these embodiments, the bore ratio inside the
In any of the above embodiments, preferably, the thickness of the
In any of the above embodiments, preferably, the depth of the
In these embodiments, the slot width of the
In any of the above embodiments, it is preferable that the width of the permanent magnet in the radial direction of the
In the embodiments, the strength of the magnetic pole can be limited by reasonably limiting the thickness and the width of the permanent magnet, so that the strength of the armature reaction can be reasonably limited, and the load and other capabilities of the motor are influenced. And through setting the thickness and the width of the permanent magnet in the above-mentioned scope, can make the rotational speed, efficiency of motor etc. all can reach the best to can improve the wholeness ability of motor.
Wherein, preferably, the motor is a permanent magnet synchronous motor.
In any of the above embodiments, preferably, as shown in fig. 1 to 3, the number of the
In these embodiments, the number of the
Wherein, preferably, the motor is a motor in a laundry treatment apparatus, such as a motor in a washing machine or a dryer.
In any of the above embodiments, preferably, as shown in fig. 3, the motor further includes: the
In these embodiments, the electrical connection between the power source such as the commercial power and the armature winding 24 can be realized through the
Wherein the output shaft is preferably detachably connected to
In any of the above embodiments, preferably, the bottom wall of the mounting cavity is provided with a mounting hole, the output shaft is located in the mounting hole through a key connection, and the output shaft is further mounted on the
In these embodiments, it may be preferable to perform positioning mounting of the output shaft with the
Preferably, as shown in fig. 1 to 3, a through hole is formed in the middle of the
As shown in fig. 3, an embodiment of the second aspect of the present invention provides a clothes treatment apparatus including the motor provided in any one of the embodiments of the first aspect.
According to the clothes treatment device provided by the embodiment of the invention, the motor provided by any one of the embodiments of the first aspect is provided, so that the clothes treatment device provided by the embodiment of the invention has all the beneficial effects of the motor provided by any one of the embodiments of the first aspect, which are not listed here.
In the above embodiment, preferably, the laundry treating apparatus further includes a washing tub directly connected to the motor drive.
In the embodiments, in a specific use, the motor may be directly connected to a washing container such as a tub or a drum of the washing machine, so that the washing container such as the washing tub may be directly driven to rotate by the motor.
In any of the above embodiments, preferably, as shown in fig. 3, the laundry treating apparatus further includes a
In these embodiments, it is preferable to provide a
Among them, it is preferable that the laundry treating apparatus is a washing machine or a drying machine, and of course, the laundry treating apparatus may be other products besides the washing machine and the drying machine.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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