KR102684473B1 - Motor having impeller - Google Patents

Abstract

The present invention relates to a motor with a built-in impeller, and more specifically, to a motor with a built-in impeller in which the rotor is driven without a shaft by coupling the impeller to the rotor, which is a rotating part. For this purpose, the impeller part is fixed on the inside, it consists of a rotating part with magnets spaced apart at a preset interval in the outer circumferential direction, and a state core, and the rotating part includes a fixing part inserted into the inside. When power is applied to the fixing part, A motor with a built-in impeller is disclosed that generates water jet propulsion by spraying water introduced from the front to the rear by rotating the rotating part accordingly.

Description

Motor with built-in impeller {Motor having impeller}

The present invention relates to a motor with a built-in impeller, and more specifically, to a motor with a built-in impeller in which the rotor is driven without a shaft by coupling the impeller to the rotor, which is a rotating part.

A surfboard using an electric motor and a water jet structure using a rechargeable battery, which is a prior document (KR 10-2016-0057060), drives the electric motor to rotate the impeller through the shaft (this structure is also the same in most published patents) lim). At this time, since the driving force generated by the electric motor is transmitted to the impeller through the shaft, not only is the loss of the generated power correspondingly large, but the shaft also increases the size of the module, making miniaturization and modularization difficult.

Therefore, there is a need to improve a structure that can transmit the driving force of the electric motor to the impeller as it is while rotating the impeller using an electric motor.

KR 10-2016-0057060 (Title of invention: Surfboard with electric motor and water jet structure using rechargeable battery)

Therefore, the present invention was created to solve the problems described above. Since the impeller is attached and detachable inside the motor (or rotor), power loss is minimized due to the absence of a shaft when rotating at high speed, and the invention is capable of miniaturization and modularization. The purpose is to provide.

In addition, the purpose of the present invention is to provide an invention that can naturally cool the heat of the motor because water is provided to the motor to obtain water jet propulsion.

However, the objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The object of the present invention described above is to include a fixing part in which the impeller part is fixed on the inside, a rotating part in which magnets are spaced apart at a preset interval in the outer circumferential direction, and a state core, and the rotating part is inserted into the inside. This can be achieved by providing a motor with a built-in impeller that generates water jet propulsion by spraying water introduced from the front to the rear by rotating the rotating part as power is applied to the government.

In addition, the rotating part is composed of first and second body parts that are separately coupled to each other, and the first and second body parts and the impeller part rotate together according to the application of power to the fixing part.

In addition, when the rotating part is inserted into the fixing part, the state core, magnet, and impeller parts are fixed so that they are located on the same line.

In addition, the first body portion includes a magnet insertion groove into which a magnet interlocked with the state core to generate rotational force is inserted at preset intervals along the circumferential direction of one surface of the first body portion, a screw thread formed along the inner surface of the first body portion, and It includes a coupling groove formed along the circumferential direction of the first body between the magnet insertion grooves for coupling with the second body,

The second body portion is a waterproof cover for waterproofing the magnet inserted into the first body portion, and includes a coupling groove formed along the circumferential direction of the second body portion for coupling with the first body portion.

In addition, the first and second body parts each have a mating surface that makes face-to-face contact when coupled, and a magnet insertion groove is formed in the longitudinal direction on the coupling surface of the first body part. At this time, the magnet is of a rectangular or square type.

Additionally, the coupling grooves of each of the first and second body parts are formed along the peripheral surface at equal intervals from each other.

In addition, the screw thread formed in the first body portion is formed in the end region of the first body portion,

The impeller part is formed on the outer circumferential surface of the impeller unit by interlocking with the screw threads of the first body part to be coupled to the first body part, and the screw threads are coupled so that the impeller part is locked in the rotation direction when the impeller part that generates the water jet driving force rotates.

Additionally, the impeller portion is formed into a fan without an axis by being coupled to the first body portion.

In addition, a coupling groove is formed along the circumferential direction, and further includes an O-ring part interposed between the first body part and the second body part to prevent water from flowing into the magnet insertion groove when water flows in, and the first body part and the second body part. , The first and second body parts are waterproofed and fixed by joining the screw through the coupling groove of the second body part and the O-ring part.

In addition, it is located in the outer areas on both sides of the fixed part and further includes a plurality of bearing parts that allow the rotating part to rotate relative to the fixed part by inserting and fixing the rotating part inward.

In addition, a waterproofing unit is installed in the outer area of each bearing so that the rotating part is inserted inward to prevent water from entering the state core, and a guide vane is placed behind the rotating part to control the speed and direction of water flowing out in the flow direction. It further includes a nozzle unit disposed behind the guide vane unit and spraying water backward to generate a water jet propulsion force.

According to the present invention as described above, there is an effect of minimizing power loss due to the structure without a shaft (or shaft axis).

In addition, according to the present invention, water flows into the motor, which has the effect of naturally cooling the motor.

In addition, according to the present invention, due to the shaftless structure, the central area of the impeller is formed as a “circle or ellipse” hole, so that incoming marine foreign matter can pass directly through, which has the effect of preventing impeller failure.

The following drawings attached to this specification illustrate a preferred embodiment of the present invention, and serve to further understand the technical idea of the present invention along with the detailed description of the invention. Therefore, the present invention is limited to the matters described in such drawings. It should not be interpreted in a limited way.
1 and 2 are perspective views of a motor with a built-in impeller according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of a motor with a built-in impeller according to an embodiment of the present invention;
Figure 4 is an exploded perspective view of the rotating part according to an embodiment of the present invention;
Figure 5 is an exploded perspective view of the fixed part, rotating part, guide vane part, and nozzle part according to an embodiment of the present invention;
Figures 6 and 7 are cross-sectional views showing the rotating part (rotor) inserted into and coupled to the inside of the fixing part, bearing part, and waterproofing part according to an embodiment of the present invention;
Figures 8 and 9 are perspective views of a plurality of bearing parts and a plurality of waterproofing parts combined according to an embodiment of the present invention;
Figure 10 is a perspective view showing a motor with a built-in impeller according to an embodiment of the present invention coupled to a surfer board.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below does not unduly limit the content of the present invention described in the claims, and it cannot be said that all of the configurations described in this embodiment are essential as a solution to the present invention. In addition, descriptions of matters that are obvious to those skilled in the art and skilled in the art may be omitted, and descriptions of such omitted components (methods) and functions may be sufficiently referenced without departing from the technical spirit of the present invention.

<Structure and function of motor with built-in impeller>

The motor 10 with a built-in impeller according to an embodiment of the present invention shown in the attached drawings 1 and 2 is a BLDC motor type motor and an impeller are integrated with each other (impeller is detachable) in a structure that does not require a shaft. It is a structure that minimizes power loss and allows natural cooling of the motor through interlocked operation. Meanwhile, a motor with a built-in impeller means that an impeller is integrally coupled to the motor without a shaft, and a motor with a built-in impeller can also be called a propeller with a built-in impeller. In addition, the impeller-embedded motor 10 receives water from the front and sprays water toward the rear to generate water jet propulsion. At this time, because there is no shaft, power loss can be minimized. Hereinafter, the motor 10 with a built-in impeller according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

As shown in FIG. 3, the motor 10 with a built-in impeller according to an embodiment of the present invention approximately includes a plurality of waterproof parts (500, 510, 520), a plurality of bearing parts (400, 410, 420), a fixed part 300, and a rotating part 100. , a guide vane part 600, and a nozzle part 700. If necessary, additional components that are obvious to those skilled in the art may be added to configure the interconnection of the motor. The rotating part 100 and the fixing part 300 may be configured as a BLDC motor type.

The rotating part 100 is inserted into the fixing part 300 as shown in FIGS. 4 and 6 . At this time, in order to rotate the rotary part 100, the distance between the outer edge surface of the rotary part 100 and the inner edge surface of the fixing part 300 is arranged to be a certain distance apart when inserted inside. As shown in Figure 4, the rotating part 100 is composed of a first body part 110 and a second body part 140, and the first and second body parts have a structure that can be attached and detachable to each other. A magnet insertion groove 111a into which the magnet 111 can be inserted is formed in the first body 110 along the circumferential direction of the coupling surface 115 of the rotating part. The magnet 111 inserted into the magnet insertion groove 111a is interlocked with the stake core of the fixing part 300, which will be described later, so that the rotating part rotates. The magnet insertion grooves 111a are formed in the first body so that each groove is spaced a certain distance along the circumferential direction, and a coupling groove 113 is formed between each groove along the circumferential direction. The coupling surface 115 on which the magnet insertion groove 111a and the coupling groove 113 are formed is located at the rear of the first body based on the water flow direction (that is, assuming that water flows from the first body to the second body). It is located in the direction Accordingly, the coupling surface 115 of the first body part and the coupling surface 145 of the second body part, which will be described later, come into contact with each other when the first and second body parts are coupled. The above-described magnets 111 are provided in plural numbers and are each inserted into the magnet insertion groove 111a. The magnet can be a permanent magnet or an electromagnet. The size and number of magnets can be determined depending on the rotation speed and output torque of the motor.

The impeller unit 120 provides direct rotational motion to the inflow water to discharge the inflow water to the rear. As shown in FIG. 4, the impeller part 120 has a screw thread 122 formed on its outer peripheral surface, and this screw thread 122 and the screw thread 112 of the above-described first body part are coupled to each other, so that the impeller part 120 ) is built into the motor. At this time, the impeller portion 120 is threaded so as to be locked to the first body portion 110 when rotating in the rotation direction of the wing 121, thereby preventing the impeller portion 120 from falling off from the first body portion 110. can do. When threaded, as shown in FIGS. 6 and 7, the state core 310, magnet 111, and wings 121 are positioned on the same vertical line to maximize the water jet propulsion force due to the inflow of water. . However, the above-mentioned screw thread coupling can be preferably applied to simplify the structure, and other structures for coupling and fixing the impeller portion 120 to the first body portion 110 are also within the scope of the technical spirit of the present invention. can be adopted in

Meanwhile, since the impeller unit 120 according to an embodiment of the present invention has a structure in which a shaft (not shown) is not coupled, it is preferable to be formed to have only the wings 121 as a structure without an axis into which the shaft is inserted. . That is, the impeller unit 120 approximately has a first circumferential surface (outside) and a second circumferential surface (inside), and a plurality of wings (three in FIG. 4) are provided between the first and second circumferential surfaces. It is provided with a structure in which a circular hole (assumed to be a hole larger than the hole through which the conventional shaft passes) is formed on the inside of the second circumferential surface so that the incoming water can pass directly through, and marine foreign matter, etc. flows in the direction of the water flow. Even if it does, it has the advantage of being able to pass right through without getting caught in the wing 121. Power loss can be minimized by this impeller structure.

The second body portion 140 is coupled to the first body portion 110 in a detachable manner. The second body portion 140 is a waterproof cover for waterproofing the magnet 111 inserted into the first body portion 110. That is, the second body portion 140 is formed with a coupling surface 145 that is in face-to-face contact with the coupling surface 115 of the first body part, and this coupling surface 145 is the coupling surface 145 of the second body portion 140. It is located in front of the water flow direction. An O-ring part 130 is inserted between the coupling surface 115 of the first body part and the coupling surface 145 of the second body part to make it waterproof. A coupling groove 131 is formed in the circumferential direction of the O-ring portion 130, and is formed at the same distance from each of the coupling grooves 113 and 143 formed in the first and second body parts, so that the screw penetrates when screwed. When the size of the magnet 111 is large, an insertion groove 141 into which the magnet can be inserted may be formed on the outer peripheral surface of the second body portion. However, preferably, all of the magnets 111 are inserted into the magnet insertion groove 111a of the first body, and if the magnet is large depending on the usage environment, the magnet insertion groove 111a of the first body and the magnet insertion groove 111a of the second body are inserted. A magnet may be inserted into the magnet insertion groove 141. In this case, it is desirable to form a magnet insertion groove (not shown) in the O-ring portion 130 equal to the size of the magnet so that the magnet 111 can penetrate through it. The magnet insertion groove formed in the O-ring portion is formed between each coupling groove (131). When the magnet 111 is seated in the magnet insertion groove 111a of the first body, the O-ring portion 130 covers the magnet insertion groove 111a and the first and second bodies are screwed together to form a waterproof connection. At this time, coupling grooves 143 are formed on the outer peripheral surface of the second body portion at equal intervals from the coupling grooves 113 and 131 formed in the first body portion and the O-ring portion. In order to facilitate screw insertion when screwing together, a longitudinally extending groove 146 is formed on the outer circumferential surface of the second body, and the screw can be easily inserted into the coupling groove 143 through this groove 146. You can.

As shown in Figure 5, the rotating part 100 is inserted and fixed inside the housing part 800, and the guide vane part 600 and the nozzle part 700 are located at the rear of the rotating part 100 to generate water jet propulsion force. do. When inserting and fixing the rotating part 100, the outer surface of the rotating part 100 and the inner surface of the fixing part 300 do not contact each other but are spaced a certain distance apart for rotation of the rotating part, and the rotating part 100 is connected to the bearing part 400. Ensure that it is fixed by . That is, the rotating part 100 is fixed through the inside of the fixing part 300, the bearing part 400, and the waterproofing part 500.

The fixing unit 300 is roughly composed of a state 310 and a power supply unit 320, and power is supplied through the power supply unit 320, thereby interlocking with the magnet 111 of the rotating unit to rotate the rotating unit 100. In addition to supplying power, the power supply unit 320 may further include a control signal line that controls the rotation of the motor by a control unit (not shown). Heat may be generated by driving the motor, but in the present invention, there is an advantage in that the motor can be naturally cooled by water flowing into the rotating part 100. The basic structure of the rotating part and the fixed part described above is the same as that of the BLDC motor, and matters not described in the present invention may be added without departing from the technical spirit of the present invention.

The bearing units 400 are disposed at both ends of the state 310, respectively, as shown in FIGS. 3, 6, and 7. In addition, the waterproof portion 500 is disposed at each end of the plurality of bearing portions 410 and 420 to prevent water from flowing into the stake 310. The first waterproof portion 510 is disposed on the end side of the first bearing portion 410, and the second waterproof portion 520 is disposed on the end side of the second bearing portion 420. The bearing unit 400 and the waterproofing unit 500 have a roughly “circle or oval” shape, and the rotating unit 100 is inserted and arranged inside them. The rotating part 100 is fixed by the bearing part 400, and thus the rotating part 100 is rotated relative to the fixed part 300. The fixing part 100, the bearing part 400, and the waterproofing part 500 are fixed by the housing part 800. As shown in FIG. 1, the housing part 800 surrounds and secures the fixing part 100, the bearing part 400, and the waterproofing part 500. The housing portion 800 may be coupled to the surfer board 20 as shown in FIG. 10, which will be described later.

The guide vane unit 600 shown in FIGS. 3 and 5 is disposed at the rear of the rotating unit 100 and controls the speed and direction of water discharged from the rotating unit 100. In addition, the nozzle unit 700 is disposed at the rear of the guide vane unit 600, and water jet propulsion is generated by spraying the water discharged from the guide vane unit 600 rearward.

As shown in FIG. 10, the motor 10 with a built-in impeller according to an embodiment of the present invention is mounted at the rear of the surfer board 20 and generates water jet propulsion to move the surfer board 20 forward (or backward). . Water flows into the back of the surfer board 20 (30), and the rotation of the BLDC motor rotates the impeller to discharge water toward the guide vane, thereby generating a water jet propulsion force. At this time, since water flows in from the back of the surfboard 20 and is supplied toward the motor, the heat generated by the motor can be naturally cooled. Meanwhile, the motor 10 with a built-in impeller according to an embodiment of the present invention can be mounted on not only the surfer board 20 but also jet skis, surfboards, kayaks, canoes, etc.

In explaining the present invention, matters that are obvious to those skilled in the art and skilled in the art may be omitted, and descriptions of such omitted components (methods) and functions may be sufficiently referenced without departing from the technical spirit of the present invention. You will be able to.

The description of the configuration and function of each part described above is explained separately from each other for convenience of explanation, and as needed, one configuration and function may be implemented by integrating with other components, or may be implemented in further detail.

Although the present invention has been described above with reference to one embodiment, the present invention is not limited to this, and various modifications and applications are possible. That is, those skilled in the art will easily understand that many modifications are possible without departing from the gist of the present invention. In addition, it should be noted that if a specific description of the known functions and their configurations related to the present invention or the combination relationship between each component of the present invention is judged to unnecessarily obscure the gist of the present invention, the detailed description has been omitted. something to do.

10: Motor with built-in impeller
20: Surfer Board
30: water flow path
100: Rotating part (rotor part)
110: first body portion
111: magnet
111a: Magnet insertion groove
112: thread
113: Coupling groove (screw groove)
115: mating surface
120 Impeller part
121: Wing (fan)
122: thread
130: O-ring part
131: Coupling groove (screw groove)
140: Second body portion (magnetic waterproof cover portion)
141: Magnet insertion groove
143: Coupling groove (screw groove)
145: mating surface
146: Home
300: Fixed part (state core part)
310: State
320: Power supply unit (power supply pin)
400: Bearing part
410: first bearing part
420: second bearing part
500: Waterproofing part
510: first waterproofing unit
520: second waterproofing unit
600: Guide vane part
700: nozzle part
800: Housing part

Claims (10)

A rotating part in which the impeller part is fixed on the inside and magnets are spaced apart at preset intervals in the outer circumferential direction, and
It is made of a state core and includes a fixing part into which the rotating part is inserted inside,
As power is applied to the fixing part, the rotating part rotates to spray water flowing in from the front backwards to generate water jet propulsion,
The rotating part,
It consists of first and second body parts that are separated and joined to each other,
The first and second body parts and the impeller part rotate together according to the application of power to the fixing part,
The first body part,
A magnet insertion groove into which the magnet, which interlocks with the state core to generate rotational force, is inserted at preset intervals along the circumferential direction of one surface of the first body portion;
A screw thread formed along the inner surface of the first body portion, and
It includes a coupling groove formed along the circumferential direction of the first body portion between the magnet insertion grooves for coupling with the second body portion,
The second body part,
A waterproof cover for waterproofing a magnet inserted into the first body, and comprising a coupling groove formed along the circumferential direction of the second body for coupling with the first body.
delete According to claim 1,
A motor with a built-in impeller, wherein the state core, magnet, and impeller are fixed to be located on the same line when the rotating part is inserted into the fixing part.
delete According to claim 1,
A motor with a built-in impeller, characterized in that the coupling grooves of each of the first and second body parts are formed along the circumferential surface at equal intervals from each other.
According to claim 1,
The screw thread formed in the first body portion is formed in an end region of the first body portion,
The impeller part,
A thread is formed on the outer circumferential surface to interlock with the thread of the first body to be coupled to the first body,
A motor with a built-in impeller, characterized in that the screw thread is coupled so that the impeller part is locked in the rotation direction when the impeller part in which the water jet propulsion force is generated is rotated.
According to claim 6,
The impeller part,
A motor with a built-in impeller, characterized in that the impeller portion is coupled to the first body portion to form a shaftless fan.
According to claim 1,
A coupling groove is formed along the circumferential direction, and it further includes an O-ring part interposed between the first body part and the second body part to prevent water from flowing into the magnet insertion groove when water flows in,
A motor with a built-in impeller, characterized in that the first and second body parts are waterproof and fixed by engaging a screw through a coupling groove of the first and second body parts and the O-ring part.
According to claim 1,
A motor with a built-in impeller further comprising a plurality of bearing parts located on both outer regions of the fixed part and allowing the rotating part to rotate relative to the fixed part by inserting and fixing the rotating part inward.
According to clause 9,
A waterproofing portion that prevents water from entering the state core by being disposed so that the rotating portion is inserted into the outer area of each bearing portion,
A guide vane unit disposed behind the rotating unit to control the speed and direction of water flowing out in the flow direction, and
A motor with a built-in impeller, characterized in that it further includes a nozzle unit disposed behind the guide vane unit to generate water jet propulsion force by spraying water rearward.