KR101357898B1 - Air blower for fuel cell vehicle - Google Patents

Abstract

The present invention relates to an air blower for a fuel cell vehicle having a rotor acting as a rotor and a hall sensor detecting a rotational speed integrally housed in an insulator and mounted to a rotating shaft. According to the air blower for a fuel cell vehicle according to the present invention, since the flow resistance to the air is reduced in the air blower, noise and vibration are reduced, the motor is cooled efficiently, and the rigidity of the rotor assembly is increased. There is an effect of improving the operational stability and durability.

Description

Air blower for fuel cell vehicle

The present invention relates to an air blower, and more particularly, to a fuel cell vehicle including a magnet serving as a rotor of a BLDC motor, and a rotor assembly in which an Hall sensor for detecting a rotational speed is integrally accommodated in an insulator and mounted to a rotating shaft. Relates to an air blower.

Generally, the fuel cell vehicle is driven by using hydrogen supplied from the fuel supply unit and oxygen in the air supplied from the air supply unit is supplied to the humidifier and is continuously generated by the electrochemical reaction, which is the reverse reaction of electrolysis of water do.

Here, the fuel cell vehicle supplies a fuel cell stack for producing electricity, a humidifier for humidifying and supplying fuel and air to the fuel cell stack, a fuel supply unit for supplying hydrogen to the humidifier, and air containing oxygen to the humidifier. It includes an air supply unit, and a cooling module for cooling the fuel cell stack.

At this time, the air supply unit is configured to include an air cleaner for filtering foreign matter contained in the air, an air blower for compressing and supplying the air filtered from the air cleaner, and a control box for controlling the air blower.

1 is a cross-sectional view showing an example of an air blower.

As shown in FIG. 1, the air blower 10 is coupled to the rear end of the inlet duct 20 and an inlet duct 20 having an air inlet 21 through which external air is introduced, and a stator (inside). 31 and the motor housing 30 in which the rotor assembly 32 is installed, and the air discharge port 41 is formed at one side of the motor housing 30 and are connected to the rear end of the motor housing 30, and the air is rotated by the rotor assembly 32. It comprises an impeller housing 40 is accommodated impeller 42 for compressing, and a support member 50 coupled to the rear end of the impeller housing 40 to rotatably support the rotor assembly (32).

At this time, the air introduced into the inlet duct 20 through the air inlet 21 is introduced into the impeller 42 through the motor housing 30 and the impeller housing 40, and according to the rotation of the rotor assembly 32. Due to the rotation of the impeller 42, it is compressed to high pressure and discharged to the outside through the air discharge port 41 of the impeller housing 40.

That is, air flows into the impeller 42 as the impeller 42 rotates at high speed, and the pressure rapidly rises through the impeller 42 to be discharged to the outside (see Patent Document 1).

FIG. 2 is a detailed view of the conventional rotor assembly shown in FIG. 1.

As shown in FIG. 2, the rotor assembly 32 includes a rotating shaft 33, a Hall sensor 34 coupled to the rotating shaft 33, and a magnet 35. 33 is coupled to the hollow of the impeller 42, so that the impeller 42 also rotates when the rotary shaft 33 rotates.

The magnet 35 serves as a rotor (rotor) in the BLDC motor, and rotates integrally with the rotary shaft 33 when power is applied to the stator 31. At this time, the Hall sensor 34 detects the rotation angle and the rotation speed of the rotary shaft 33, the insulator 36 is interposed between the magnet 35 and the Hall sensor 34 to prevent magnetic field interference.

However, like the conventional rotor assembly 32 shown in FIG. 2, the hall sensor 34 is provided at the front end of the rotation shaft 33, and has a diameter larger than that of the hall sensor 34 with the insulator 36 interposed therebetween. When the large magnet 35 is provided at the rear of the hall sensor 34, the air is subjected to a lot of flow resistance while the air flows along the surface of the rotor assembly 32.

That is, the air flowing along the outer circumferential surface of the rotary shaft 33 hits the cover 37 of the magnet 35 in the process of flowing along the outer circumferential surfaces of the hall sensor 34 and the insulator 36 to receive flow resistance.

Accordingly, while the air passes through the rotor assembly 32, a lot of flow noise and vibration are generated, and as the air does not flow smoothly, the cooling performance of the motor is deteriorated.

In addition, since the Hall sensor 34, the insulator 36, the magnet 35, and the cover 37 must be separately assembled on the rotary shaft 33, there is a high possibility of unbalanced mass due to excessive assembly surface. In order to solve this problem, there is a problem in that the balance of the rotor assembly 32 is insufficient due to the lack of a balancing surface.

Korean Patent Publication No. 10-2009-0020449

The present invention has been made to solve the problems described above, one embodiment of the present invention, by providing an insulator on the rotating shaft to accommodate the magnet and the hall sensor spaced apart integrally in the internal space, respectively, It is an object of the present invention to provide an air blower for a fuel cell vehicle having the effect of reducing the flow resistance, noise and vibration, and increasing the rigidity of the rotor assembly in the process of flowing the air along the surface of the rotor assembly.

In order to achieve the above object, a preferred embodiment of the present invention, the inlet duct having an air inlet through which the outside air flows in the front, the motor housing is coupled to the rear end of the inlet duct and the stator and rotor assembly is installed therein And an impeller housing coupled to the rear end of the motor housing and having an air discharge port formed at one side thereof, the impeller housing compressing air by the rotation of the rotor assembly, and coupled to the rear end of the impeller housing to rotate the rotor assembly. In the air blower for a fuel cell vehicle comprising a support member for supporting the vehicle, The rotor assembly is a rotary shaft, one end is coupled to the impeller, a magnet coupled to one side of the rotary shaft, spaced apart rearward from the magnet Hall sensor coupled to the rotating shaft, and the magnet Is interposed between the Hall sensor provides a fuel cell vehicle air blower comprising: a shield for receiving the magnet and the Hall sensor integrated apart from each other in the inner space.

At this time, the inside of the insulator is formed by separating the magnet receiving portion and the hall sensor receiving portion partitioned with each other in the front and rear direction, the outer diameter of the partition and the hall sensor receiving portion is preferably smaller than the outer diameter of the magnet receiving portion.

On the other hand, the cover is coupled to the front and rear ends of the insulator, respectively.

According to an air blower for a fuel cell vehicle according to an exemplary embodiment of the present invention, since the magnet and the hall sensor are spaced apart from each other in the insulator and are integrally provided on the rotating shaft, air flows in the impeller direction along the rotor assembly. The resistance is reduced and, accordingly, there is an effect that noise and vibration is reduced when the air flows into the blower.

In addition, since the insulator, the magnet, and the hall sensor are integrally assembled to the rotating shaft, the possibility of unbalanced mass is lowered according to the reduction of the assembly surface, and the manufacturing time and cost are reduced due to the reduction of the number of assembly parts.

In addition, since the insulator including the magnet and the hall sensor inside is integrally mounted on the rotating shaft, the rigidity of the rotor assembly is increased, thereby reducing noise and vibration, and the misalignment due to the increase of the balancing surface of the rotor assembly. It is possible to prevent the degradation of the rigidity of the rotor assembly according to.

1 is a cross-sectional view showing an example of an air blower.
Figure 2 is a detailed view of the conventional rotor assembly shown in Figure 1;
3 is a sectional view of an air blower for a fuel cell vehicle according to an embodiment of the present invention;
4 is a detailed view of the rotor assembly shown in FIG. 3.

Hereinafter, a preferred embodiment of an air blower for a fuel cell vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Example

3 is a cross-sectional view of an air blower for a fuel cell vehicle according to an exemplary embodiment of the present invention.

As shown in FIG. 3, an air blower (hereinafter, referred to as an “air blower”) 100 for a fuel cell vehicle according to an embodiment of the present invention includes an inlet duct 200 through which external air is introduced and an inlet duct 200. ) Is coupled to the rear end of the motor housing 300, in which the motor including the stator 310 and the rotor assembly 320 is installed, and the air outlet 440 is coupled to the rear end of the motor housing 300. The impeller housing 400 is formed and the impeller 410 compresses air by the rotation of the rotor assembly 320 and the rotary shaft of the rotor assembly 320 is coupled to the rear end of the impeller housing 400. It comprises a support member 500 for rotatably supporting the 321.

Here, the air inlet 210 is formed in front of the inlet duct 200, the inlet duct 200 is a passage of air introduced from the outside when the impeller 410 rotates.

That is, when the impeller 410 rotates, outside air flows into the inlet duct 200 through the air inlet 210, and the inflowed air flows through the inlet duct 200 to the motor housing 300 to be described later. do.

The motor housing 300 is coupled to the rear end of the inlet duct 200 and accommodates the motor therein, wherein the motor has a stator (stator) 310 accommodated in the motor housing 300 with a coil wound around its outer circumference. The rotor assembly 320 is rotatably installed through the hollow of the stator 310.

In addition, the rotor assembly 320 may include a rotary shaft 321, a magnet 323 coupled to one side of the rotary shaft 321, and a hall sensor coupled to the rotary shaft 321 spaced apart from the rear of the magnet 323. 325 and an insulator 327 interposed between the magnet 323 and the hall sensor 325.

Here, the rear end portion of the rotary shaft 321 is coupled to the hollow of the impeller 410, so that the impeller 410 rotates together when the rotary shaft 321 rotates.

In addition, the magnet 323 serves as a rotor (rotor) in the BLDC motor, and rotates integrally with the rotary shaft 321 when power is applied to the stator 310.

In addition, the Hall sensor 325 is to detect the rotation angle and rotation speed of the rotary shaft 321, the insulator 327 is interposed between the magnet 323 and the Hall sensor 325 to prevent magnetic field interference. .

The rotor assembly 320 according to an embodiment of the present invention includes a magnet 323 and a hall sensor 325 spaced apart from each other in the insulator 327 and are integrally provided on the rotating shaft 321, and the flow of air. There is an effect of reducing noise and vibration and increasing stiffness according to the resistance reduction, which will be described later with reference to FIG. 4.

The impeller housing 400 is coupled to the rear end of the motor housing 300 to receive the impeller 410 therein, and a circumferential scroll-shaped blower 420 is formed around the impeller housing 400.

At this time, the air passage 430 is formed in the blower 420 to communicate with the inside of the impeller housing 400 so that the air compressed at high pressure by the impeller 410 is formed, and at one side of the blower 420. The air discharge port 440 is formed in the radial direction of the rotating shaft 321.

In addition, the impeller 410 is installed at the rear end of the rotary shaft 321, and rotates with the rotary shaft 321 in accordance with the rotation of the rotary shaft 321 through the air inlet 210 of the inlet duct 200 Compressed air is compressed, and the air compressed at high pressure by the impeller 410 is discharged to the air discharge port 440 through the flow path 430 of the blower 420.

The support member 500 is coupled to the rear end of the impeller housing 400 to support the rotary shaft 321. The support member 510 is accommodated in the center of the support member 500 to accommodate the rear end of the rotary shaft 321. Support rotatably.

At this time, the front end of the rotary shaft 321 is preferably supported rotatably by a support bearing 610 provided in front of the motor housing 300, for example, as shown in Figure 3 motor housing 300 The cover member 600 is coupled to the front of the cover member, and the support bearing 610 may be accommodated in the center of the cover member 600.

The front and rear ends of the rotary shaft 321 are preferably covered by the caps 710 and 720, respectively, to prevent the inflow of foreign substances. In this case, the cap 710 covered at the front end of the rotary shaft 321 flows in from the outside. In order to reduce the frictional resistance with the air is preferably formed in the form of a cone protruding forward.

In the air blower 100 configured as described above, when the power is applied to the stator 310, the rotary shaft 321 and the impeller 410 rotate together with the rotation of the magnet 323 and the external air through the inlet duct 200. And the external air introduced is compressed to a high pressure in the process of passing through the impeller 410, and discharged to the outside through the air discharge port 440 of the blower 420 formed in a scroll form surrounding the impeller housing 400. do.

4 is a detailed view of the rotor assembly shown in FIG. 3.

Rotor assembly 320 according to an embodiment of the present invention, the rotary shaft 321, the magnet 323 coupled to one side of the rotary shaft 321, and the rear of the magnet 323, the rotary shaft ( Hall sensor 325 coupled to the 321 and the insulator 327 interposed between the magnet 323 and the Hall sensor 325.

At this time, the front end of the insulator 327 extends in the direction of the magnet 323 to surround the outer circumferential surface of the magnet 323, and the rear end of the insulator 327 extends in the direction of the hall sensor 325 to cover the outer circumferential surface of the hall sensor 325. Will be wrapped.

That is, as shown in FIG. 4, the magnet 323 and the hall sensor 325 are accommodated apart from each other in the insulator 327.

In more detail, the magnet receiving portion 327b and the hall sensor receiving portion 327c, which are divided by the partition wall 327a, are spaced apart from each other in the front and rear directions in the insulator 327, and the magnet receiving portion 327b. ), The magnet 323 is accommodated, and the Hall sensor 325 is accommodated in the hall sensor 325c.

In this case, the partition wall 327a disposed between the magnet 323 and the hall sensor 325 serves to prevent magnetic field interference generated between the magnet 323 and the hall sensor 325, and the thickness thereof may be appropriately adjusted. Can be selected.

In addition, since the diameter of the magnet 323 is larger than the diameter of the hall sensor 325, the outer diameter of the magnet receiving portion 327b is also formed larger than the outer diameter of the hall sensor receiving portion 327c, and in FIG. Although an example in which the partition wall 327a is formed at 327c is illustrated, the present invention is not limited thereto, and the partition wall 327a may be formed at the magnet accommodating part 327b, and the magnet accommodating part 327b and the hall sensor accommodating part ( A partition wall 327a of a predetermined thickness may be formed on both sides of the 327c.

On the other hand, it is preferable that the cover 329 is coupled to the front end of the magnet receiving portion 327b and the rear end of the hall sensor receiving portion 327c to prevent foreign substances from entering.

As such, when the magnet 323 and the hall sensor 325 are integrally spaced apart from each other in the insulator 327, there is a reduction in manufacturing time and cost according to the reduction in the number of assembly parts of the rotor assembly 320. As the magnet 323, the hall sensor 325, and the insulator 327 are integrated, the rigidity of the rotor assembly 320 against vibration is increased.

In addition, referring to Figures 1 and 2, in the conventional air flow into the impeller 42 along the rotation shaft 33, the air introduced into the motor housing 30 through the inlet duct 20, the rotating shaft In the rotor assembly 320 according to an embodiment of the present invention, the rotor 330 according to an embodiment of the present invention receives a lot of flow resistance as it hits the cover 37 of the magnet 35 protruding to the outside of the insulator 327. The flow resistance to air flowing along is significantly reduced compared to the prior art.

In this case, the cover 329 coupled to the front end of the insulator 327 may be formed in a conical shape having an outer circumferential surface convexly curved in the direction of the inlet duct 200 to reduce the flow resistance.

On the other hand, in general, the rotating body has an unbalance amount formed from the beginning, the centrifugal force is generated by the unbalance amount remaining in the rotating body when rotating at a certain rotational speed (rpm), which causes the rotating body to vibrate the shock and noise And affect the accuracy of operation.

In order to solve this problem, a balance adjustment is generally performed on the rotating body. For example, the balancing adjustment is performed by finding a mass imbalance position of the rotating body in a balancing machine and compensating the mass unbalance. This can be done by squeezing or adding weight to it.

However, in the case of the rotor assembly, due to the difficulty in securing a space for attaching the weight, the relevant parts are often ground and scraped, but in the conventional case, due to the lack of a balancing surface that can perform such a balance adjustment, sufficient balance is achieved. It is difficult to make the adjustment, or there is a problem in that the balance adjustment is excessively made by mistake and the rigidity of the rotor assembly is lowered.

However, according to the rotor assembly 320 according to an embodiment of the present invention, since the balance adjustment operation can be performed on the outer circumferential surface of the insulator 327 surrounding the magnet 323, a balancing surface is sufficiently secured and misbalanced. It is possible to prevent the reduction in the rigidity of the rotor assembly 320 due to (balancing error).

Referring to the operation of the air blower for a fuel cell vehicle according to an embodiment of the present invention.

When power is supplied to the coil wound on the stator 310, the rotary shaft 321 rotates along with the magnet 323, and at this time, the impeller 410 integrally coupled to the rotary shaft 321 is the rotary shaft 321. Rotate with to suck the outside air into the air blower (100).

The outside air is introduced into the inlet duct 200 through the air inlet 210, flows into the impeller housing 400 through the motor housing 300, and is compressed to high pressure by the impeller 410.

In addition, the air compressed at high pressure moves along the discharge passage 430 of the blower 420 in the form of scroll, and is discharged to the outside through the air discharge port 440.

At this time, the air introduced into the inlet duct 200 flows along the surface of the rotor assembly 320 in the process of flowing in the direction of the impeller 410, the air passing through the cap 710 is the magnet receiving portion 327b It is guided to the outer circumferential surface of the, and then flows to the outer circumferential surface of the low stepped Hall sensor receiving portion 327c and then naturally guided toward the impeller 410 along the outer circumferential surface of the rotating shaft 321.

Therefore, the flow resistance of the air in the air blower 100 is reduced in comparison with the related art, thus reducing the occurrence of noise and vibration and efficiently cooling the motor, and the magnet 323 and the hall sensor 325 are insulators. 327 is integrally housed in the rotary shaft 321, and is easily assembled and maintained, and the rigidity of the rotor assembly 320 is increased, thereby improving the operational stability and durability of the air blower 100. It becomes visible.

100: air blower
200: inlet duct
300: motor housing 310: stator
320: rotor assembly 321: rotating shaft
323: magnet 325: hall sensor
327 Insulator 327a partition wall
327b: magnet housing 327c: hall sensor housing
329: cover
400 impeller housing 410 impeller
500: support member

Claims (4)

An inlet duct 200 having an air inlet 210 through which external air flows in front, and a motor housing coupled to a rear end of the inlet duct 200 and having a stator 310 and a rotor assembly 320 installed therein. 300 and an impeller housing 400 coupled to a rear end of the motor housing 300 and having an air outlet 440 formed at one side thereof, and containing an impeller 410 for compressing air by the rotation of the rotor assembly 320. In the fuel blower vehicle air blower comprising a support member 500 coupled to the rear end of the impeller housing 400 to rotatably support the rotor assembly 320,
The rotor assembly 320 has a rotary shaft 321 having one end coupled to the impeller 410, a magnet 323 coupled to one side of the rotary shaft 321, and rearward from the magnet 323. It is interposed between the Hall sensor 325 and the magnet 323 and the Hall sensor 325 and spaced apart from the magnet 323 and the Hall sensor 325 spaced apart in the internal space Air blower for a fuel cell vehicle comprising an insulator (327) for receiving.
The method according to claim 1,
The inside of the insulator 327 is a blower for a fuel cell vehicle, characterized in that the magnet receiving portion (327b) and the hall sensor receiving portion (327c) divided by partitions 327a are formed spaced apart from each other in the front and rear directions.
The method according to claim 2,
The outer diameter of the partition 327a and the hall sensor accommodating part 327c is smaller than the outer diameter of the magnet accommodating part 327b.
The method according to claim 1,
The air blower for a fuel cell vehicle, characterized in that the cover (329) is respectively coupled to the front and rear ends of the insulator (327).

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