JP2009232490A - Assembling method of electric air blower, and electric cleaner equipped with electric air blower assembled by using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the high efficiency of an electric air blower while securing tightness between an impeller suction port and a tight cap fixed to the center of casings, in the electric air blower. <P>SOLUTION: The assembling method of the electric air blower is configured in such a manner that: the casings are constituted of two components; the external casing A12a is press-inserted from the upper part of an air guide 10; after that, the internal casing B12b is press-inserted from the upper part of the casing A12a; the press insertion of the casing A12a and the press insertion of the casing B12b are stopped immediately after the contact of the top face of the rotating impeller 11 and the bottom face of the internal peripheral rib of the tight cap 16; and the casing A12a and the casing B12b are joined to each other. By this, a cutting engagement margin in the thrust direction between the top-face internal periphery of the impeller 11 and the external periphery of the internal peripheral rib of the tight cap 16 can be formed to be 1 mm or smaller, and the generation of amount of cutting chips of the tight cap 16 can be reduced while securing the tightness at the suction port, thus achieving the high efficiency of the electric air blower. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric blower mainly used in an electric vacuum cleaner, and in particular, achieves high efficiency by improving the tightness of the impeller suction port and improving the rectifying action by preventing resin shavings from adhering to the electric vacuum cleaner. The suction power, which is the basic performance of the machine, is improved.

  There exists an electric blower like patent document 1 as a conventional electric blower.

  Conventionally, this type of electric blower 19 has a structure as shown in FIG. 51 of the motor part 32 is an armature having a commutator 52 and an armature winding 22, and the armature winding 22 is wound around the outer periphery of the armature core 70. In the armature 51, bearings 4 are press-fitted into both ends of a motor shaft 53, and the bearings 4 are supported by a load side bracket 5 and an anti-load side bracket 6. Reference numeral 7 denotes a brush holder made of metal with a built-in carbon brush 8, which is held by the anti-load side bracket 6. Reference numeral 9 denotes a field having a field winding 23, and the field winding 23 is wound around the outer periphery of the field core 72.

  10 of the fan part 31 is a load-side bracket 5 and a load and a rectifying air guide formed between the air suction and blowing impellers 11. A plurality of diffusers 102 are arranged in the blowing direction of the impellers 11. The upper part of the impeller 11 is covered with a casing 12. The impeller 11 is configured by sandwiching a plurality of blades 100 with an umbrella-shaped plate mae 101 and a disk-shaped plate bobbin 103, and the blade 100 is inserted into holes provided in the plate mae 101 and the plate bobbin 103. It is inserted and mechanically fixed by caulking. The impeller 11 configured as described above is fixed to the shaft 53 by a spacer (not shown), a washer 14 and a nut 15 and rotates together with the shaft 53. The air guide 10 is fixed to the load side bracket 5 with screws (not shown) or the like, and the load side bracket 5 and the anti-load side bracket 6 are also fixed with screws (not shown) or caulking or the like. is there. Reference numeral 16 denotes a tight cap made of a resin or the like that forms the intake port of the casing 12. The tight cap is fixed to the central portion of the casing 12 by welding or the like, and the plate liner 101 that forms the intake port of the impeller 11. The tight cap 16 ensures tightness by contacting.

  The electric blower 19 is configured in such a structure, and as a function, the blowing air generated by the rotation of the impeller 11 passes through the air guide 10 for rectification provided on the outer periphery of the outlet of the impeller 11. The armature 51 of the motor unit 32 and the winding of the field 9 are cooled, passed through the anti-load side bracket 6 and exhausted rearward.

The case where the electric blower 19 is incorporated in a vacuum cleaner has a structure as shown in FIG. An electric vacuum cleaner main body 61 (hereinafter referred to as a main body) is divided into a dust collection chamber 81 and a motor chamber 82 by a lattice partition wall 53 provided at the center, and the dust collection chamber 81 has a paper bag 54, a motor. The electric chamber 19 is provided with the electric blower 19. A connection pipe 60, a hose 59, a tip pipe 58, an extension pipe 57, and a nozzle 56 are connected to the main body 61. Therefore, as an action, the dust collected from the nozzle 56 by the suction force of the electric blower 19 passes through the extension pipe 57, the tip pipe 58, the hose 59, and the connection pipe 60 and is collected in the paper bag 54 of the dust collection chamber 81. .
Japanese Unexamined Patent Publication No. 7-63195

  In the conventional electric blower 19, the tightness at the suction port is ensured by the plate cap 101 that forms the suction port of the impeller 11 and the tight cap 16 made of resin fixed to the center of the casing 12 by welding or the like. However, in consideration of various variations in actual mass production, in order to ensure the tightness in the thrust direction even with the maximum and minimum of the variations, the top of the plate mae 101 and the tip of the tight cap 16 are over. The lap allowance was set to a design dimension that secured an average of 1 mm or more. For this reason, the scraped scrap of the tight cap 16 generated between about 1 mm of the overlap allowance adheres to a part of the suction flow path and generates turbulence due to the attached unevenness, or the overlap allowance is average. Since it is comparatively long as 1 mm or more, the frictional heat due to the surface contact is large, and as a result, the tight cap 16 on the surface in contact with the frictional heat is excessively shaved, resulting in a gap.

  The present invention solves the above-mentioned problem, and the casing 12 has a two-part structure and is assembled with an overlap margin of 1 mm or less in the thrust direction where the impeller 11 and the tight cap 16 are in contact with each other. As a result, it is possible to reduce the amount of scrap residue generated in the tight cap 16 while ensuring tightness at the end, and as a result, it prevents sticking scraps from adhering to the intake flow path and generating gaps due to increased frictional heat, resulting in higher efficiency. It is possible to provide an electric blower that has been improved.

  In order to solve the conventional problems, an electric blower assembly method of the present invention includes an armature having an armature winding, a shaft, and a commutator, a field having a field winding, and an armature of the armature. An anti-load side bracket and a load side bracket holding a brush holder for rotatably supporting one end and making electrical connection with the commutator, and an air outlet for air blowing fixed to one end of the armature An impeller, an air guide provided with a plurality of diffusers for rectifying the air blown from the impeller outlet, and the impeller and the outer periphery of the air guide for tight contact with the impeller suction port A casing having a tight cap made of a material such as resin and having a rib with a rib extending downward on the inner periphery is provided at the center, and the casing is The air guide is composed of two parts, a casing A that forms the outside of the casing and a casing B that forms the inside of the casing, on the center side from the innermost peripheral tip of the diffuser of the air guide. From above, press-fit until it collides with the top surface of the diffuser, then press-fit the casing B equipped with the tight cap from above the casing A, inside the top surface of the rotating impeller and the tight cap Immediately after contact with the bottom surface of the peripheral rib, the press-fitting of the casing A and the casing B is stopped, and the casing A and the casing B are joined while securing the tightness of the impeller and the tight cap.

  As a result, while securing tightness at the suction port, the cutting fitting margin in the thrust direction between the inner peripheral portion of the rotating impeller and the outer peripheral portion of the tight cap inner peripheral rib is formed to be 1 mm or less. Since the amount of scraped debris generated from the cap can be reduced, as a result, it is possible to provide an electric blower that achieves higher efficiency by preventing scrap debris from adhering to the intake flow path and generating gaps due to increased frictional heat. It becomes possible.

  In the method for assembling the electric blower of the present invention, since the casing has a two-part configuration, it is possible to assemble with an overlap margin of 1 mm or less in the thrust direction in which the impeller suction port and the tight cap contact each other. The tight cap scraping amount can be reduced while securing the tightness at the suction port. As a result, it becomes possible to provide an electric blower that is more efficient by preventing the adhesion of shavings in the intake passage and the generation of a gap due to an increase in frictional heat.

  According to a first aspect of the present invention, an armature having an armature winding, a shaft, and a commutator, a field having a field winding, and one end of the armature are rotatably supported and electrically connected to the commutator. Anti-load-side bracket and load-side bracket holding a brush holder, an impeller fixed to one end of the armature and provided with an air outlet for air blowing on the outer periphery, and air flow from the impeller outlet is rectified The air guide having a plurality of diffusers to be arranged, and the outer periphery of the impeller and air guide are made of a material such as resin for contact tightness with the impeller suction port, and are substantially donut-shaped and downward on the inner periphery A casing having a tight cap having a rib extending to the center is provided, and the casing is disposed closer to the center than the innermost peripheral end of the diffuser of the air guide. The casing A is composed of two parts, a casing A constituting the outside of the casing and a casing B constituting the inside of the casing. The casing A is press-fitted from above the air guide until it collides with the top surface of the diffuser. After that, the casing B provided with the tight cap is press-fitted from above the casing A, and the casing A and the casing B immediately after contact between the top surface of the rotating impeller and the bottom surface of the inner peripheral rib of the tight cap. While securing the tightness of the impeller and the tight cap while securing the tightness of the impeller and the tight cap, the assembly method of the electric blower that joins the casing A and the casing B is ensured while the tightness at the suction port is secured. The cutting fitting allowance in the thrust direction between the inner peripheral part of the top surface of the rotating impeller and the outer peripheral part of the inner peripheral rib of the tight cap is 1 mm. It can be formed underneath to reduce the amount of shavings generated from the tight cap. As a result, it prevents the sticking of shavings into the intake flow path and the generation of gaps due to increased frictional heat, resulting in higher efficiency. A blower can be provided.

  According to a second aspect of the present invention, there is provided a vacuum cleaner comprising: a dust collecting chamber for collecting dust; an air intake unit connected to communicate with the dust collecting chamber; and the electric blower assembled according to the first invention; Therefore, by installing a highly efficient electric blower, the suction performance of the vacuum cleaner can be improved.

(Embodiment)
Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional technology are denoted by the same reference numerals and description thereof is omitted. The detailed configuration of the conventional tight cap 16 is configured as shown in the enlarged sectional view of FIG. When the electric blower 19 is assembled in actual mass production, the casing 12 is press-fitted into the load side bracket 5 (may be the anti-load side bracket 6 depending on the motor configuration) in the last step. At this time, contact is made between the tip of the tight cap 16 made of resin or the like and the inlet of the impeller 11, that is, the tip of the plate mae 101 having an umbrella shape. Therefore, the overlap margin in the thrust direction is cut off on the tight cap 16 side formed of resin or the like. As a method of scraping, if the impeller 11 rotates, the overlapping tight cap 16 side is inevitably scraped off, but when the casing 12 is press-fitted into the load side bracket 5, the impeller 11 is pressed in a rotated state. Alternatively, there is a method in which the casing 12 is completely press-fitted in a state where the impeller 11 is not rotated, and the impeller 11 is rotated and scraped at once after the press-fitting. In any case, when the conventional mass production shown in FIG. 4 is taken into consideration, the overlap margin (B-C dimension) is required to be 1 mm or more, so it was cut off with a relatively long dimension of 1 mm or more. The resin of the tight cap 16 becomes a scraped residue 106 and adheres to the front end inlet portion of the tight cap 16. As shown in the enlarged view of the tip contact portion in FIG. 4, the air leak generated at the tip portion has a flow as shown in the figure, and therefore inevitably adheres to the tip cap inlet of the tight cap 16, and the flow of intake air Result in turbulence and loss. In order to prevent this inconvenience, the overlap margin (dimension between B and C) may be shortened as much as possible, but when the side surface of the impeller 11 of the bearing 4 on the load side is A, the impeller 11 suction port. The position of the tip portion B of the plate mae 101 is determined by the height dimension of the finished impeller 11 in which the blade 100 is sandwiched between the plate bobbin 103 and the plate mae 101 via the spacer and the washer 14 and fixed. Since many of them are made of iron plate, aluminum, etc., dimensional variations after parts and assembly are relatively small. However, the position of the front end inlet C of the tight cap 16 is the same as that of the front end B of the plate liner 101, and has a dimensional configuration based on the side surface A of the impeller 11 of the load side bearing 4. The position of the casing 102 is fixed at the top surface D of the diffuser 102 of the air guide 10 fixed by the above, and the position of the distal end inlet C of the tight cap 16 fixed to the casing 102 by welding or the like is determined. At this time, since the air guide 10 is molded from resin, the dimensional variation is relatively large, and because the tight cap 16 made of resin or the like is fixed to the casing 12 by welding or the like, the dimensional variation in welding is not uniform. Because of its large size, the C position has a relatively large size variation in the thrust direction when mass production is considered. Therefore, if the overlap size between B and C is not secured 1mm or more at the mass production level, depending on the mass production variation, BC does not overlap and a gap is created, and the suction performance is greatly reduced. Will cause a malfunction. Also, if the casing 12 is press-fitted in the process, a facility configuration is provided that stops the press-fitting of the casing 12 when the overlap margin between B and C cannot reach 1 mm due to equipment that can detect the press-fitting position. However, in this case, since the casing 12 does not hit the top surface D of the air guide 10 diffuser 102 and there is a possibility that a gap will be generated on the D surface, leakage occurs on the D surface. The suction performance will be greatly reduced.

  In order to improve the above problems, as shown in FIG. 1, the casing 12 is divided into two parts, the casing 12 on the side to be press-fitted with the load side bracket 5 is the casing A12a, and the joint press-fitting portion is 104-a. The casing 12 on the side where the tight cap 16 is welded is the casing B12b, and the joint press-fitting portion is 104-b.

  As an assembly method in mass production in the case of such a configuration, the casing 12 is basically press-fitted at the end of the mass production process as in the conventional case. However, since the casing 12 has a two-divided configuration, first, the load side bracket 5 and the casing A12a on the side to be press-fitted are press-fitted. Thereafter, the casing B12b on the side where the tight cap 16 is finally welded is press-fitted and fixed by the joint press-fit portions 104-a and 104-b provided on the casing A12a. At this time, the casing B12b is press-fitted using equipment such as an air press machine, but in the case of press-fitting while rotating the impeller 11, the press-fitting is performed while continuously measuring the power consumption of the electric blower 19 continuously. Do. When the tip of the tight cap 16 on the casing B12b contacts the suction port of the impeller 11, the motor is temporarily restrained and the power consumption increases rapidly. Therefore, the power consumption is detected by a wattmeter. Then, it feeds back to the air press and stops the press-fitting of the casing B12b. With the above-mentioned equipment, while making fine adjustments such as the press-fitting speed of the air press machine and the stop judgment threshold of the wattmeter, the equipment is adjusted so that the overlap margin between B and C is within 1 mm. The overlap margin that had to be secured above can be kept within 1 mm. Particularly in the case of the embodiment shown in FIG. 1, the casing 12 is divided into two parts, so that the top surface D of the air guide 10 diffuser 102 can be securely tightly formed by the casing A12a. Even if the position of the tight cap 16 moves up and down in the thrust direction, a stable suction performance can be ensured without destroying the tightness of the top surface D of the diffuser 102, and the overlap margin between B and C is within 1 mm. Therefore, the number of scraps 106 of the tight cap 16 scraped off by the rotation of the impeller 11 is small, and adhesion to the tip of the tight cap 16 can be drastically reduced. Moreover, since it is 1 mm or less, generation of frictional heat due to surface contact can be suppressed, so that generation of frictional heat after scraping is small, and as a result, the gap between the tight cap 16 and the impeller 11 suction port can be minimized. Is possible.

  Further, as shown in FIG. 2, the inner surface of the plate carrier 101 of the impeller 11 is processed so as to form a fine powder when the tight cap 16 is scraped off by applying a striped (sandpaper-like) process. Further, it is possible to prevent the scrap residue 106 from adhering to the tip of the tight cap 16. Further, in some cases, the shaving residue 106 may adhere to the inner surface of the plate liner 101 instead of the tip of the tight cap 16 and cause a loss. However, as shown in FIG. Since the surface becomes uneven, it is possible to prevent adhesion to the inner surface.

  Further, as shown in FIG. 3, the stability of the suction performance is further improved by inserting the tight packing 105 for performing tight in the vertical direction at the joint press-fitting portions 104-a and 104-b of the casing 12. It is also possible to plan. The joint press-fitting portion is basically tight by surface press-fitting in the circumferential direction, but there is a concern that a very fine gap may be generated by the surface press-fitting. Therefore, as shown in FIG. 3, it is possible to reliably perform tightness at the joint press-fitting portion by inserting the donut-shaped tight packing 105 in the vertical direction.

  Finally, when the electric blower 19 described above is incorporated in the electric vacuum cleaner main body 61 shown in FIG. 6, it is possible to mount an electric blower with higher efficiency. It is possible to improve.

  As described above, the method for assembling the electric blower according to the present invention can obtain a compact, lightweight and highly efficient suction performance by improving the tightness at the suction port. Regardless of the machine, it can also be used for applications such as handy type, vertical type, or DC rechargeable vacuum cleaner, where downsizing is an advantage.

The expanded fragmentary sectional view of the tight cap vicinity which shows one Embodiment of this invention Enlarged partial cross-sectional view when the inner surface of the impeller plate mae Enlarged partial cross-sectional view when tight packing is sandwiched in the joint press-fitted part Enlarged partial sectional view near the tight cap in the conventional example Side surface partial sectional view of the electric blower in the conventional example Partial sectional view of a conventional vacuum cleaner

Explanation of symbols

5 Load-side bracket 6 Anti-load-side bracket 9 Field 10 Air guide 11 Impeller 12 Casing 12a Casing A
12b Casing B
16 Tight Cap 19 Electric Blower 22 Armature Winding 23 Field Winding 51 Armature 52 Commutator 53 Shaft 101 Plate Mae 102 Diffuser 104 Bonding Press-In Part 105 Tight Packing 106 Scraping Waste

Claims (2)

An armature having an armature winding, a shaft, and a commutator, a field having a field winding, and a brush holder for rotatably supporting one end of the armature and electrically connecting the commutator The held anti-load side bracket and the load side bracket, an impeller fixed to one end of the armature and provided with a blowout port for air blowout on the outer periphery, and a plurality of sheets for rectifying the blowout air from the impeller blowout port An air guide having a diffuser, and an impeller and an outer periphery of the air guide are made of a material such as resin for contact tightness with the impeller suction port and have a substantially donut-shaped rib extending downward on the inner periphery. A casing having a cap at the center is provided, and the casing is disposed on the center side from the innermost peripheral end of the diffuser of the air guide. A casing A constituting the side and a casing B constituting the inside of the casing are constituted by two parts, and the casing A is press-fitted and joined from above the air guide until it collides with the top surface of the diffuser. Thereafter, the casing B provided with the tight cap is press-fitted from above the casing A, and immediately after the top surface of the rotating impeller and the bottom surface of the inner circumferential rib of the tight cap contact the casing A and the casing B. An electric blower assembling method for joining the casing A and the casing B while stopping the press-fitting and ensuring the tightness of the impeller and the tight cap. A vacuum cleaner comprising: a dust collecting chamber for collecting dust; an air intake portion connected to communicate with the dust collecting chamber; and an electric blower assembled using the assembling method according to claim 1.

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