JP2010144521A - Electric fan and vacuum cleaner - Google Patents

Abstract

An electric blower having excellent suction performance is provided.
An impeller fixed to one end of an armature (not shown) and provided with a blowout port (not shown) on the outer periphery, and a load side supporting one end of the armature on the impeller 11 side via a bearing 4 A bracket 5, an anti-load side bracket (not shown) that rotatably supports the other end of the armature, an air guide 10 that rectifies the wind from the outlet, and a casing that covers the impeller 11 and the air guide 10 ( (Not shown), and a housing chamber in which the tip of the impeller 11 protrudes toward the load-side bracket 5 with an acute angle and the diameter of the protrusion is located at the center of the load-side bracket 5 and accommodates the bearing 4 A circular contact ring 124 having a diameter larger than the outer diameter of 127 was provided, and the tip of the circular contact ring 124 was brought into contact with the bottom surface portion of the air guide 10.
[Selection] Figure 1

Description

  The present invention relates to an electric blower and a vacuum cleaner using the same.

  As a conventional electric blower and a vacuum cleaner using the same, there have been those shown in FIGS. 5 to 7 (for example, see Patent Document 1).

  FIG. 5 is a cross-sectional view of a conventional electric blower described in Patent Document 1, FIG. 6 is an enlarged cross-sectional view of the main part of the electric blower, and FIG. 7 is a diagram of a conventional electric vacuum cleaner using the electric blower. It is a schematic block diagram.

  In FIG. 5, this type of conventional electric blower 19 includes a motor unit 32 and a fan unit 31, and 51 of the motor unit 32 includes an armature having a commutator 52 and an armature winding 22. Thus, the armature winding 22 is wound around the outer periphery of the armature core 70. In the armature 51, the bearing 4 is press-fitted into both ends of the shaft 53 of the motor portion 32, and the bearing 4 is supported by the load side bracket 5 and the 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. 9 is 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 portion 31 is a rectifying air guide formed between the load side bracket 5 and the impeller 11 for air suction and blowing as a load. The upper portion of the impeller 11 is covered with a casing 12. The impeller 11 assembled by pressing parts such as aluminum has a plurality of blades 110 sandwiched by a shroud disk 112 having a flat disk shape and a shroud mae 111 having an umbrella disk shape, and sintered. It is fixed to the shaft 53 by a spacer 120 made of metal or brass, a washer 14 made of sheet metal or the like, 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 the like. Reference numeral 16 denotes a tight cap made of resin or the like that forms the air inlet 12a of the casing 12, and is fixed to the central portion of the casing 12 by welding or the like, and the suction port 11a of the impeller 11 and the tight cap 16 are in contact with each other. Therefore, tightness is ensured.

  Next, the configuration near the bearing on the load side of the electric blower will be described with reference to FIG.

  In FIG. 6, the internal configuration of the bearing 4 is such that the inner ring 121 and the outer ring 122 are sealed with seal plates 123 a and 123 b covering the upper and lower sides thereof, and the load-side seal plate 123 a is not in contact with the inner ring 121. The load-side seal plate 123b is in contact with the inner ring 121.

  In general, the non-contact seal plate 123a is made of iron, and the contact seal plate 123b is made of rubber. Furthermore, in the past electric blower 19, both the upper and lower seal plates 123a and 123b of the load-side bearing 4 have been subjected to non-contact iron sealing. However, as the suction performance of the vacuum cleaner is improved, As a result, the vacuum pressure is remarkably improved, and as a result, a slight air leak occurs from the motor part 32 side to the fan part 31 side through a slight gap inside the bearing 4 on the load side. This was one of the causes of a decrease in the suction performance of the fan unit 31.

  Therefore, recently, as shown in FIG. 6, the seal plate 123b on the anti-load side of the bearing 4 is brought into contact with the inner ring 121 to prevent air leakage from the motor part 32 side toward the fan part 31 side. The suction performance of the part 31 was improved.

  With such a structure, the conventional electric blower 19 is configured, and as a function, a blowing air generated when the impeller 11 rotates is a rectifying air guide 10 provided on the outer periphery of the outlet 11b of the impeller 11. After passing, the armature 51 of the motor part 32 and the field winding 23 of the field 9 are cooled, passed through the anti-load side bracket 6 and exhausted rearward.

  The conventional vacuum cleaner incorporating the electric blower 19 has a structure as shown in FIG.

  In FIG. 7, a vacuum cleaner main body 61 (hereinafter referred to as “main body 61”) is divided into a dust collection chamber 81 and a motor chamber 82 by a lattice partition wall 53 provided at the center. The chamber 81 is provided with a paper bag 54, and the motor chamber 82 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 sequentially connected to the main body 61.

As an operation of the conventional vacuum cleaner, 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 dust collecting chamber 81. In a paper bag 54.
Japanese Patent No. 3533806

  In the conventional electric blower 19, the bearing 4 on the load side bracket 5 side has one seal plate 123 b in contact with the inner ring of the two seal plates 123 a and 123 b covering the upper and lower sides of the inner ring 121 and the outer ring 122 constituting the bearing 4. By arranging the contacted side toward the anti-load side, the inner ring 121 and the outer ring 122 constituting the interior of the bearing 4 and the slight gaps between the seal plates 123a and 123b covering the upper and lower sides of the inner ring 121 and the outer ring 122 are arranged. Thus, air has been prevented from entering from the motor unit 32 side to the fan unit 31 side, and suction performance has been improved.

  However, since the seal plate 123b made of a rubber material is contact-rotated at a high speed of 30,000 rpm to 45,000 rpm, mechanical friction loss due to contact increases and air leakage can be almost zero, but mechanical friction loss is reduced. As a result, the total efficiency of the electric blower 19 was not at a level that could be satisfactorily satisfied by the offset results of both. In particular, the contact rubber seal type bearing 4 is more expensive in price than the standard type non-contact iron seal type bearing 4, and considering the effect of the total efficiency of the electric blower 19 described above, the cost is reduced. Has a problem that the effect of improving the suction performance of the electric blower 19 is small.

  The present invention solves the above-mentioned conventional problems, and with an inexpensive configuration, prevents air leakage from a conventional load-side bearing, minimizes mechanical loss due to friction, and further improves suction performance. An object is to provide an electric blower that realizes the above.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes an armature having an armature winding, a field having a field winding, and an air blower around an outer periphery fixed to one end of the armature. An impeller provided with a blowout opening, a load-side bracket that rotatably supports one end of the armature on the impeller side via a bearing, and a counterbalance that rotatably supports the other end of the armature via a bearing. A load-side bracket; an air guide made of resin that rectifies blown air from the outlet; and a casing that is made of sheet metal and covers the impeller and the air guide. A circular contact ring that protrudes toward the load side bracket and has a diameter larger than the outer diameter of the housing chamber that is located at the center of the load side bracket and houses the bearing Provided, the tip of the circular contact ring is in contact with the bottom surface of the air guide, which can prevent air leakage from the motor part passing through the internal clearance of the load side bearing to the fan part and reduce mechanical loss. It is possible to provide an electric blower that achieves further improvement in suction performance by suppression and reduction in price.

  Moreover, the vacuum cleaner of this invention was equipped with the dust collection chamber which collects dust, and the electric blower of any one of Claims 1-5, and made the said dust collection chamber and the said electric blower communicate. Therefore, the suction performance of the vacuum cleaner can be improved.

  The electric blower of the present invention can prevent leakage of air from the motor section passing through the internal clearance of the load side bearing to the fan section, and at the same time realizes further improvement in suction performance and reduction in cost by suppressing mechanical loss. it can.

  According to a first aspect of the present invention, there is provided an armature having an armature winding, a field having a field winding, an impeller fixed to one end of the armature and provided with an air outlet for air blowing on the outer periphery, and the electric machine A load-side bracket that rotatably supports one end of the impeller side via a bearing; a counter-load side bracket that rotatably supports the other end of the armature via a bearing; An air guide that rectifies the blown air from the air, and a casing that is made of sheet metal and covers the impeller and the air guide, and protrudes toward the load side bracket with a sharp tip at the bottom of the impeller, and the protruding portion A circular contact ring having a diameter larger than the outer diameter of the housing chamber that houses the bearing and is located at the center of the load side bracket, and the tip of the circular contact ring -It is in contact with the bottom part of the guide, and it can prevent air leakage from the motor part that passes through the internal clearance of the load side bearing to the fan part. It becomes possible to provide an electric blower that can be priced at the same time.

  In the second invention, in particular, the impeller of the first invention is positioned and fixed to the inner ring of the bearing in the housing chamber via a spacer made of sintered or brass, a washer made of sheet metal, and the like. Since the contact ring is integrally formed, the same effect can be obtained at a lower price.

  According to a third aspect of the invention, in particular, the impeller of the first aspect of the present invention is a shroud mae made of an umbrella-shaped disk having an air inlet in the center and a flat disk-shaped shroud cowro made of resin. It is configured by sandwiching a plurality of blades, and a circular contact ring is integrally formed on the bottom surface of the shroud, so that the same effect can be obtained at a lower price.

  According to a fourth aspect of the present invention, in particular, PTFE with which the tip of the circular contact ring contacts is arranged in a ring shape on the bottom surface of the air guide according to any one of the first to third aspects of the invention. The structure is airtight with the PTFE, so that the tightness can be greatly improved, and the suction performance can be further improved by further suppressing the mechanical loss by adopting PTFE.

  In a fifth aspect of the present invention, in particular, a labyrinth chamber having a concave cross section is provided in an annular shape at a portion of the bottom surface of the air guide according to any one of the first to fourth aspects where the tip of the circular contact ring is located. Instead of bringing the ring tip into contact with the bottom surface of the air guide, it enters the labyrinth chamber, and air tightness is secured by the labyrinth effect between the tip of the circular contact ring and the labyrinth chamber. The mechanical loss due to contact can be made zero.

  6th invention is equipped with the dust collection chamber which collects dust, and the electric blower of any one of Claims 1-5, The said dust collection chamber and the said electric blower were connected, and electric The suction performance of the vacuum cleaner can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of the electric blower according to the first embodiment of the present invention. In addition, about the same part as the said conventional electric blower, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 1, the non-contact seal structure, that is, the upper and lower seal plates 123 a and 123 b are both non-contact standard bearings for the anti-load-side seal plate 123 b of the load-side bearing 4. Is.

  In addition, in order to fix and position the impeller 11 on the shaft 53, the bottom surface portion of the shroud bobbin 112 of the impeller 11 has a spacer 120 made of sintered or brass, and a washer 14 made of sheet metal or the like. The suction side surface portion of the bobbin 112 is securely fixed to the shaft 53 by the nut 15 via the washer 14. At this time, the washer 14 located on the bottom surface portion of the shroud Ushiro 112 has a diameter larger than the outer diameter A of the housing chamber 127 of the load side bracket 5 containing the bearing 4, A circular contact ring 124 having a sharp tip is formed, and the tip of the circular contact ring 124 is configured to contact tightly with the bottom surface of the air guide 10 made of resin.

  Since the present embodiment is configured as described above, contact tightness can be performed between the washer 14 provided on the bottom surface of the shroud cow loft 112 of the impeller 11 and the central portion of the air guide 10, Even if both sides of the upper and lower seal plates 123a and 123b of the load side bearing 4 are non-contact iron seal specifications, it is possible to prevent air leakage from the motor part 32 side to the fan part 31 side.

  Further, in the case of the conventional contact rubber seal specification, it is a contact between the inner ring 121 made of rubber and iron, but in the present embodiment, it is a contact between the resin and iron and the tip portion has an acute angle shape. Since it comprises, the mechanical friction loss by contact can be reduced compared with the conventional structure. In addition, since the circular contact ring 124 is only formed on the washer 14 that is generally produced by pressing a sheet metal by pressing, no additional parts are required, and only a slight increase in processing cost is required. It is also possible to suppress price increases.

  FIG. 2 shows another example of the present embodiment. When the shroud cow 112 of the impeller 11 is formed of resin, the bottom surface portion of the shroud cow 112 is used instead of forming the circular contact ring 124 on the washer 14. Alternatively, it may be formed integrally. Thereby, it is easy to form the circular contact ring 124 as shown in FIG. 2 by resin molding, and since there is no increase in processing cost, it is possible to obtain the same effect without increasing the price.

  FIG. 3 shows another example of the present embodiment. A PTFE ring 125 made of PTFE (fluororesin) is arranged in a ring shape on the bottom surface of the air guide 10 where the tip of the circular contact ring 124 abuts. To be. PTFE has a very good penetration when the tip of the circular contact ring 124 hits it, and despite the fact that the tightness is reliable, the friction caused by the contact is very small, so that the mechanical friction loss can be greatly reduced. Is possible.

  FIG. 4 shows another example of the present embodiment. The cross section is shown only at the position where the tip of the circular contact ring 124 is located on the bottom of the air guide 10 where the tip of the circular contact ring 124 abuts. Concave shape, that is, the labyrinth chamber 126 is provided in an annular shape, and the tip of the circular contact ring 124 is inserted into the labyrinth chamber 126, thereby ensuring air tightness by the labyrinth effect and circular shape. The contact between the tip of the contact ring 124 and the bottom surface of the air guide 10 can be zeroed. As a result, it is possible to reliably prevent intake air leakage while maintaining the mechanical friction loss equivalent to that of the past bearing 4 in which the two upper and lower seal configurations of the load side bearing 4 are non-contact iron seal specifications on both sides.

  Finally, when the electric blower 19 described above is incorporated in the main body 61 shown in FIG. 7, it is possible to mount an electric blower with improved tightness, that is, higher efficiency. The suction performance of 61 can be improved.

  As described above, the electric blower according to the present invention can prevent air leakage through the load-side bearing with a relatively inexpensive configuration while suppressing mechanical friction loss. Because it is possible to obtain efficient suction performance, it can be used for applications such as handy type, vertical type, or DC rechargeable vacuum cleaner, where downsizing is an advantage, regardless of floor moving type AC vacuum cleaner It is.

Sectional drawing of the principal part of the electric blower in the 1st Embodiment of this invention The principal part expanded sectional view of the electric blower which shows another example The principal part expanded sectional view of the electric blower which shows another example The principal part expanded sectional view of the electric blower which shows another example Cross section of a conventional electric blower The main part enlarged sectional view of the electric blower Schematic configuration diagram of a conventional vacuum cleaner using the electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Load side bearing 5 Load side bracket 6 Anti-load side bracket 9 Field 10 Air guide 11 Impeller 12 Casing 14 Washer 19 Electric blower 22 Armature winding 23 Field winding 51 Armature 52 Commutator 53 Shaft 110 Blade 111 Shroud Mae 112 Shroud Ushiro 124 Circular contact ring 125 PTFE ring 126 Labyrinth chamber 127 Housing chamber

Claims (6)

An armature having an armature winding; a field having a field winding; an impeller fixed to one end of the armature and provided with a blowout port for air blowing on an outer periphery; and the impeller side of the armature A load-side bracket that rotatably supports one end via a bearing, an anti-load-side bracket that rotatably supports the other end of the armature via a bearing, and a rectifier that blows air blown from the blowout port. And a casing made of sheet metal or the like and covering the impeller and the air guide, the tip of the impeller protrudes toward the load side bracket with an acute angle, and the diameter of the protruding portion is the load A circular contact ring located at the center of the side bracket and having a diameter larger than the outer diameter of the housing chamber that houses the bearing, and the tip of the circular contact ring is the bottom of the air guide Electric blower which is in contact with the part. 2. The electric motor according to claim 1, wherein the impeller is positioned and fixed to an inner ring of a bearing in the housing chamber via a spacer made of sintered or brass, a washer made of sheet metal or the like, and a circular contact ring is integrally formed on the washer. Blower. The impeller is composed of an umbrella-shaped disk-shaped shroud mae having a suction port in the center and a flat disk-shaped shroud cowro made of resin, and sandwiching a plurality of blades. The electric blower according to claim 1, wherein a circular contact ring is integrally formed on the bottom surface of the fan. The PTFE that contacts the tip of the circular contact ring is arranged in a ring shape on the bottom surface of the air guide, and is configured to be airtight between the tip of the circular contact ring and the PTFE. The electric blower described in 1. A labyrinth chamber having a concave cross section is provided in an annular shape at a portion where the tip of the circular contact ring is located on the bottom surface of the air guide, and instead of contacting the tip of the circular contact ring with the bottom surface of the air guide, the labyrinth chamber The electric blower according to any one of claims 1 to 4, wherein the electric blower is inserted. An electric vacuum cleaner comprising the dust collection chamber for collecting dust and the electric blower according to any one of claims 1 to 5, wherein the dust collection chamber and the electric blower are communicated with each other.

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