JPH01129743A - Assembly of fan device - Google Patents

Abstract

PURPOSE:To improve assembling workability, by magnetizing a permanent magnet after mounting a rotor on a fan rotor and testing its balancing. CONSTITUTION:At first, a vertical portion 14 of a casing 13 is secured to a right side plate 2 of a fan rotor 1 through a connecting member 3. Then, each permanent magnet 20 is mounted along the inside circumference of a cylinder 15 of the casing 13. After that, the rotary body is tested by a balance testing machine. After the balance is corrected, the magnetization of each permanent magnet on a rotor 4 is performed simultaneously. A fixed shaft 6 on a stator 5 side is then inserted into the casing 13. The tip of the fixed shaft 6 is inserted into a bearing 24 forcibly fitted to a central swelling section 19 of the casing 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling a fan device such as a cross-flow fan used, for example, in an indoor unit of an air conditioner.

(Prior Art) Conventionally, to drive the rotation of a cross-flow fan used in an air conditioner or the like, a separate electric motor such as an AC induction motor is placed adjacent to the cross-flow fan in the device.
The drive shaft and the rotating shaft of the fan rotor are connected by a coupling. For this reason, a space for housing the electric motor is required within the device, resulting in disadvantages such as an increase in the size of the device. Therefore, in recent years, attempts have been made to downsize the device by configuring the rotor of a DC brushless morph to be directly connected to the side plate of the fan rotor, as shown in, for example, Japanese Utility Model Application No. 61-178095. being done.

In the above, the rotating shaft that supports the rotor is passed through the hollow cylindrical fixed shaft to which the stator is fixed, and each end of the rotating shaft and the fixed shaft is independently supported on the wall of the device. Therefore, there were problems such as a complicated structure.

Therefore, in order to simplify the structure, the present applicant previously proposed a configuration in which the rotor and stator are supported by a common fixed shaft (see Japanese Patent Application No. 194080/1982). Its composition is
This will be explained with reference to FIG. 1, which is an explanatory diagram of one embodiment of the present invention. In the figure, 1 is a fan rotor of a cross flow fan, and one side plate 2 of this fan rotor 1
The vertical end faces of a substantially cup-shaped casing 13 of the rotor 4 are connected via a connecting member 3 made of an elastic body. A central bulge 19 protruding toward the fan rotor 1 is formed at the axial center position of the vertical end surface of the casing 13, and a bearing 24 is press-fitted into the central bulge 19. On the other hand, in the figure, 1.7 is an end bracket fixed to the inside of the indoor unit of the air conditioner, and a fixed shaft 6 is erected at the axial center position of the end bracket 7. A stator 5 is fixed to. Then, by pushing the distal end side of the fixed shaft 6 through the bearing 24, it is placed at a position facing the outer peripheral surface of the stator 5.
The permanent magnet 20 attached to the inner wall surface of the cylindrical portion of the casing 13 is located, and a fan device in which a DC brushless motor type fan motor is connected to the fan rotor 1 is configured. By fixing the end bracket 7 inside the indoor unit of the air conditioner, the fixed shaft 6
is adapted to function as a support shaft on the rotor 4 side together with the stator 5. In addition, 8 in the figure is the stator 5 mentioned above.
This is a printed circuit board with control circuit components necessary to generate a rotating magnetic field.

(Problems to be Solved by the Invention) In the above fan device, the permanent magnet 2 is placed along the inner wall surface of the cylindrical portion of the casing 13 of the rotor 4.
0, the permanent magnet 20 is assembled later.
A lid body 21 is attached to the casing 13, and this lid body 21
The permanent magnet 20 is fixed in the axial direction between the vertical fixing surface 23 of the casing 13 and the vertical surface of the casing 13. The lid body 21 is made of a magnetic material so as to act as
During installation work, etc., the magnetic attraction force from the permanent magnet 20 acts on the lid body 21, so extra force is required to position and attach the lid body 21 against this magnetic attraction force. As a result, there is a problem in that the assembly work becomes complicated.

Furthermore, the magnetic attraction force of the permanent magnet 20 has a considerable adverse effect on the balance inspection of the rotating body formed by connecting the rotor 4 and the fan rotor 1. There is also the problem that it cannot be done. In recent years, as the indoor units of air conditioners have become thinner, fan rotors such as those mentioned above have become smaller in diameter.
In order to maintain a predetermined amount of air blown by a small-diameter fan rotor, it is rotated at a higher speed. Therefore, even if the fan rotor is slightly unbalanced, a large centrifugal force will be generated when the fan rotor is driven to rotate at high speed, causing vibrations in the equipment, so it is necessary to correct the balance to an accurate state. Conventionally, the fan rotor 1 and the rotor 4 were individually subjected to a balance (dynamic balance) test and corrected, but they were connected to each other in a manner that minimized misalignment, and after that, A final confirmation will be made through another balancing test. However, the permanent magnet 2
For example, the magnetic attraction force from 0 acts on the rotational drive shaft of the balance test plectrum inserted into the rotor 4, and as a result, slight misalignment between the fan rotor 1 and the rotor 4 occurs when the fan rotor 1 and the rotor 4 are connected. There is a possibility that the unbalanced state due to this may not be detected.

The present invention has been made in view of the above, and an object thereof is to provide a method for assembling a fan device that can improve assembly workability and more accurately correct the balance state.

(Means for Solving the Problems) Therefore, the method for assembling the fan device of the present invention is to
A method of assembling a fan device in which the rotor 4 of a fan motor is composed of a rotor 4 having a magnet 0 and a stator 5 disposed facing the permanent magnet 20, and the rotor 4 is connected to the fan rotor 1. After assembling the rotor 4 to the fan rotor 1, a balance test is performed on the rotating body consisting of the fan rotor 1 and rotor 4, and the necessary balance state is corrected. The permanent magnet 20 attached to the child 4 is magnetized.

(Function) In the method for assembling the fan device described above, the permanent magnets 20 are magnetized after the rotor 4 is assembled to the fan rotor l and the balance test is performed. During assembly to the fan rotor 1, and during the balance test, the magnetic attraction force from the permanent magnets as described above does not act, so there is no extra force to resist the magnetic attraction force conventionally required during assembly. etc. are no longer necessary. In addition, accurate inspection can be performed in the balance test of the assembled rotating body in which the rotor 4 is assembled to the fan rotor 1. Based on the test and its results (even without making any corrections, it is possible to make general corrections by simply inspecting the rotating body after assembling the rotor 4. As a result, it is possible to improve assembly workability and improve balance. More precise corrections of the state can be made.

(Example) Next, a specific example of the method for assembling a fan device of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows one side plate (hereinafter referred to as the right side plate) 2 side of the fan rotor 1 of a cross flow fan constructed by applying the present invention. A motor type fan motor is connected. The fan motor includes a rotor 4 connected to the right side plate 2 via a connecting member 3, a stator 5, and a stator 5.
A fixed shaft 6 is attached to the middle part, an end bracket 7 is fixed to the base end side (the right end side in the figure) of the fixed shaft 6, and the end bracket 7 is arranged opposite to the end bracket 7. It is composed of a circuit board 8. The end bracket 7 is provided on a lower mounting portion 10 provided on a main body frame 9 that constitutes the back panel of the indoor unit of the air conditioner, and on a morph cover 11 that is screwed onto the main body frame 9 from above. It is fixed to the main body frame 9 under pressure in the vertical direction (screw fastening direction) while being surrounded all around by the upper mounting portion 12 .

First, the configuration of the stator 5 side will be explained with reference to the exploded perspective view of FIG. 2. The stator 5 is attached to the middle part of the fixed shaft 6 whose right end is fixed to the end bracket 7, but before the stator 5 is assembled i, Then, the circuit board 8 is arranged.

The end bracket 7 has a substantially square vertical surface 25, and a short raised edge 26 extending toward the stator 5 is formed from the outer peripheral edge of the vertical surface 25. The circuit board 8 is disposed at a position surrounded by the outer periphery on the tip end side of the raised edge 26. Control circuit components necessary for rotation control are mounted on this circuit board 8 so as to be located on the end bracket 7 side.

Afterwards, the circuit board 8 is installed by fixing the stator 5, which has six star-shaped magnetic poles and each of which is wound with a coil 29...29, to the midway part of the fixed shaft 6. ,
The stator 5 side is configured first.

Next, the configuration and assembly procedure of the rotor 4 will be explained. This rotor 4 includes a cup-shaped casing 13 and a
arc-shaped permanent magnets 20...20 and a substantially cylindrical lid body 2
First, the vertical surface 14 of the casing 13 is fixed to the right side plate 2 of the fan rotor 1 via the connecting member 3. The connecting member 3 has a vibration-proofing function for damping the propagation of vibrations due to rotational vibration in the fan rotor 1, and is formed of an elastic material such as synthetic rubber into a ring shape and a substantially U-shaped cross section. ing. Next, the permanent magnets 20 are mounted along the inner peripheral surface of the cylindrical portion 15 of the casing 13. For this purpose, the vertical surface 14 has four substantially arch-shaped locking pieces 16 cut and raised on the opening end side at positions that equally divide the circumference concentric with the cylindrical part 15 into four parts. and short claw-shaped protrusions 17 cut and raised at two positions on the circumference between these locking pieces 16 . . . 16 . On the other hand, each of the permanent magnets 20 is connected to the cylindrical portion 1.
Each permanent magnet 20 is positioned between adjacent arcuate locking pieces 16, 16, and By pushing in the casing 13 in the axial direction from the open end side along the circumferential surface, the outer circumferential surface of each permanent magnet 20 is in close contact with the inner circumferential surface of the cylindrical portion 15. . That is, each permanent magnet 20 has an inclined surface inclined with respect to the radial direction on the inner circumferential surface side of both ends in the circumferential direction, and the arcuate locking piece 16 fits between the adjacent inclined surfaces. , abutting force acts on each permanent magnet 20 from the arcuate locking piece 16 in the circumferential direction and radially outward, and as a result, the radial direction of each permanent magnet 20 Position fixation and circumferential position fixation are simultaneously provided with high precision.

On the other hand, axial fixation in this assembled state is achieved by first positioning the left end side of each permanent magnet 20 by abutting the left end surface of each permanent magnet 20 with the tip of each claw-shaped projection 17 described above.
This is achieved by being able to cover the lid 21 with the casing 13 in this state. This lid body 21 has fitting holes 22...22 bored at appropriate locations on its circumferential side.
On the other hand, the cylindrical portion 15 of the casing 13 is formed with arc-shaped locking pieces 18 that protrude outward in the radial direction. The lid 21 is fixedly attached to the casing 13 by pushing the lid 21 in the axial direction and fitting the locking piece 18 into the fitting hole 22. At this time, a fixing surface 23 is provided on the right end surface of the lid body 21, which is bent radially inward and slightly covers the outer circumferential side of the end surface of each permanent magnet 20 over the entire circumference. Each permanent magnet 2 is connected between the fixed surface 23 and each claw-like projection 17
0 is clamped and fixed in the axial direction. A central bulge 19 that protrudes toward the fan rotor 1 is formed at the axial center of the vertical surface 14 of the casing 13, and a bearing 24 is press-fitted into the central bulge 19.

After assembling the rotor 4 to the fan rotor 1 as described above, the rotating body is placed in a balance tester and the balance state (
(dynamic balance). If an unbalanced state is detected, a clip-shaped balance weight (not shown) of an amount corresponding to the inspection result is attached to a predetermined location of the fan rotor 1 to correct the unbalanced state. After completing the correction of the balance state as described above, the permanent magnets 20, . . . , 20' disposed on the rotor 4 are magnetized all at once. This magnetization is performed by placing a field in which adjacent poles are different poles at positions facing the outer circumferential surfaces of the permanent magnets 20 . Place the pole piece and casing 13
This is done by arranging disk-shaped common opposing pole pieces close to the inner circumferential surface of each permanent magnet 20 inside. As a result, each of the permanent magnets 20 is magnetized so that the inner circumferential surface thereof is in a four-pole field state of N5NS in the circumferential direction.

After completing the balancing test of the rotating body in which the rotor 4 and the fan rotor 1 are connected as described above and the magnetization of the permanent magnet 20, the fixed shaft 6 on the stator 5 side is connected to the rotor 4. lid body 2
1 through the central opening of the fixing surface 23 in the casing 1
3, and the tip of the fixed shaft 6 is inserted into the bearing 24 press-fitted into the central bulge 19 of the casing 13.

As a result, at a position facing the inner peripheral surface of each permanent magnet 20,
The stator 5 fixed to the midway portion of the fixed shaft 6 is located, thereby configuring a fan motor.

After the above assembly, this assembly is assembled into an indoor unit of an air conditioner. FIG. 3 shows a side plate (hereinafter referred to as the left side plate) 51 of the fan rotor 1 on the opposite side to the right side plate 2.
The figure shows the installation structure for the indoor unit. As shown in the figure, a rotational support shaft 52 is provided upright at the axial center position of the left side plate 51, and this rotational support shaft 52 is attached to a bearing 54 attached to the left side wall 53 inside the indoor unit. By inserting it, the left side plate 51 is attached. The bearing 54 is
The bearing outer body 55 is press-fitted into a mounting hole in the left side wall 53, and the bearing outer body 55 is made of an elastic material such as synthetic rubber that has a vibration-proofing function. A spherical seat is formed in the bearing 54, which has a spherical outer peripheral surface and is slidably rotatable along the spherical seat.
is installed.

After the left side plate 51 is attached, as shown in FIG. 4, the right side plate 2 is attached. For this purpose, a lower mounting portion 10 for fixing the end bracket 7 is formed on the right end side of the main body frame 9 constituting the back panel of the wall-mounted indoor unit. A substantially U-shaped fitting groove is formed in the lower mounting portion 10 along the outer peripheral edge of the lower half of the end bracket 7 in the figure. The lower side of the end bracket 7 is fitted into this fitting groove, and the motor cover 11, which has an inverted U-shaped fitting groove that is vertically symmetrical to the fitting groove of the lower mounting portion 10, is screwed onto the main body frame 9. As the end bracket 7 is fastened, the peripheral edge of the end bracket 7 is fitted into the respective fitting grooves over the entire circumference, and a pressing force is applied in the screw fastening direction, that is, in the vertical direction, so that the end bracket 7 is fixed. Ru.

After the above assembly is completed, for example, in FIG. 4, an indoor heat exchanger (not shown) is installed on the upstream side of the fan rotor 1, on the upper right side in the figure, and furthermore, the lower mounting portion 1
An indoor control device (not shown) is housed in the upper right side of 0, and after electrical wiring is made between this indoor control device and the terminal on the circuit board 8, the front panel (not shown) is housed.
The assembly of the indoor unit is completed by attaching it to the main body frame 9.

As explained above, in the above embodiment, the permanent magnet 2
The magnetization to 0 is the assembly of the rotor 4 to the fan rotor 1,
For this reason, for example, each permanent magnet 20 is assembled to the inner circumferential surface of the casing 13, and during the subsequent installation work of the lid body 21 to the casing 13. There is no need for extra force to resist the magnetic attraction force of permanent magnets (as in the case of conventional methods), and assembly can be carried out smoothly.Also, in balance tests, there is no need for extra force to resist the magnetic attraction force of permanent magnets. Due to the absence of magnetic attraction, a more accurate balancing test can be performed on the rotating body in which the fan rotor 1 and the rotor 4 are connected, resulting in a more accurate approach to the balanced state. Modifications can be made, and since it is not necessary to inspect and modify the fan rotor 1 and rotor 4 independently, as in the past, it is also possible to shorten assembly time and reduce assembly man-hours.

Note that the above embodiment describes a fan device in which a DC brushless morph configured by disposing permanent magnets 20 on the outer circumferential side of the stator 5 is connected to the fan rotor 1 of a cross flow fan. The present invention can be applied to other fan devices in which the permanent magnets are arranged with the inside and outside reversed, in which they face each other in the axial direction, or in which a fan motor other than a DC brushless motor type is connected.

(Effects of the Invention) As described above, in the method for assembling a fan device of the present invention, after the assembly of the rotor of the fan rotor and the balance test of this assembled rotor are completed, the permanent magnet in the rotor is Since the magnet is magnetized, the magnetic attraction force from the permanent magnet does not act on the assembled parts when assembling the rotor, unlike in the past, and the detection accuracy in the balance test is not impaired. Since there is no problem, it is possible to improve the assembly workability and to correct the balance state more accurately.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the right side of the fan rotor of a cross flow fan constructed by applying the present invention, FIG. 2 is an exploded perspective view of the right side, and FIG. 3 is the left side of the fan rotor. FIG. 4 is a cross-sectional view showing a structure for attaching the right side panel to the indoor unit, and FIG. 4 is a perspective view showing the attachment to the indoor unit on the right side panel. 1...Fan rotor, 4...Rotor, 5...Stator, 20...Permanent magnet.

Claims (1)

[Claims] 1. The rotor (4) of a fan motor consists of a rotor (4) having a permanent magnet (20) and a stator (5) disposed facing the permanent magnet (20). (1), wherein the fan rotor (1) and the rotor (4) are assembled after the rotor (4) is assembled to the fan rotor (1). It is characterized by carrying out a balance test of the rotating body, making necessary corrections to the balance state, and then magnetizing the permanent magnet (20) attached to the rotor (4). How to assemble a fan device.