JP5998006B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to an electric blower including an electric blower, an exhaust port, and an exhaust passage that guides air from the electric blower to the exhaust port.

  Air containing dust sucked from the suction port (main body suction port) is guided to the dust collection chamber, and after removing the dust, the air removed from the dust collection chamber is used to cool the commutator motor of the electric blower. There is known an exhaust gas recirculation type vacuum cleaner in which air after cooling a motor is divided into recirculation air and discharge air and led to respective exhaust ports through respective filters (for example, Patent Document 1).

  Regardless of whether it is an exhaust gas recirculation type, normally, the dust-removed air is used for cooling the commutator motor of the electric blower. Many filters clean the exhaust by placing a filter in the path and passing it through the filter. Furthermore, there is one that uses the air after cooling the electric blower for cooling the control circuit board of the electric blower. The flow path is configured so that a part of the air from the electric blower to the exhaust port is guided to the exhaust port after being guided to a place where the control circuit board is disposed.

JP 2005-40448 A

  In Patent Document 1, when a commutator motor is operated, carbon powder is generated and scattered due to contact between the carbon brush of the motor and the commutator. Therefore, a filter is placed in front of the exhaust port to collect the carbon powder. It is arranged.

However, when the filter is arranged, it is necessary to replace the filter, which is troublesome for the user. From that point of view, it is better to have a smaller number of filters. Furthermore, since it is necessary to make the filter replaceable when the filter is arranged, the structure becomes complicated and the cost burden increases, and it is contrary to the reduction in size and weight of the cleaner body.
In order to effectively cool the circuit board, it is preferable to arrange the circuit board in the exhaust path so as to cool all the air in the exhaust path from the electric blower to the exhaust port. If the circuit board is arranged in the exhaust passage, it is not necessary to provide a bypass passage for cooling the circuit board, which contributes to the miniaturization of the cleaner body.

In recent years, carbon brushes and commutators of commutator motors have been improved, and filters that repair fine carbon powder are not necessarily required. However, for example, there is no possibility that the carbon of the brush cracks due to aging and the reddish carbon pieces pop out, and it is preferable to provide some protective means for safety.
In addition, the circuit board is arranged around the protection board in the event that foreign matter enters through the suction-side flow path, and to avoid accidents when parts inside the vacuum cleaner come off and fall on the circuit board. It is preferable to shield it from what is being done. In particular, there is a possibility that foreign matter may flow along with the air in the flow path through which air flows, and since an electric blower having a movable part is disposed, it is desirable to block foreign matter on the upstream side of the flow path.

  The present invention has been made in view of the above circumstances, and can effectively cool the circuit board and protect the circuit board by blocking foreign matter upstream of the air flow passing through the circuit board. A vacuum cleaner is provided.

  The present invention separates and collects dust sucked together with air from the air, collects the air, generates an air flow for sucking the dust, and discharges the air flowing through the electric blower to the outside. And a circuit board disposed in the exhaust path including a circuit for controlling the electric blower, and a perforated plate disposed between the electric blower and the circuit board. Provide a vacuum cleaner.

  Since the vacuum cleaner of this invention is equipped with the circuit board arrange | positioned at the said exhaust path, and the perforated plate arrange | positioned between the said electric blower and the said circuit board, the air after cooling an electric blower While the circuit board is cooled by passing through the holes of the perforated plate, the circuit board is protected by being shielded by the perforated plate from the electric blower on the upstream side of the exhaust passage as viewed from the circuit board. Therefore, the circuit board can be protected by effectively cooling the circuit board and blocking foreign substances on the upstream side of the air flow passing through the circuit board.

1 is an external perspective view of a vacuum cleaner according to an embodiment of the present invention. It is a top view of the cleaner body concerning an embodiment of this invention. It is a side view of the cleaner body concerning an embodiment of this invention. It is a 1st disassembled perspective view of the cleaner body concerning an embodiment of this invention (the circumference of a bogie and a wheel). It is a 2nd disassembled perspective view of the vacuum cleaner main body which concerns on embodiment of this invention (electric blower periphery). It is a 3rd disassembled perspective view of the vacuum cleaner main body which concerns on embodiment of this invention (duct periphery). It is a 4th disassembled perspective view of the cleaner main body which concerns on embodiment of this invention (code reel periphery). It is AA arrow sectional drawing of FIG. It is AA arrow sectional drawing of the state in which the dust collection unit was removed. It is AA arrow sectional drawing of the state in which the dust collection unit was removed. 1 is an external perspective view of a dust collection unit according to an embodiment of the present invention. It is AA arrow sectional drawing shown in FIG. 2 of the dust collection unit which concerns on embodiment of this invention. It is explanatory drawing which shows the flow path of the airflow in the cleaner body shown in FIG. It is an external appearance perspective view of the lower 1st case concerning this embodiment. It is an external appearance perspective view which shows the perforated plate which concerns on embodiment of this invention. It is the front view and AA arrow sectional view which show the perforated plate which concerns on embodiment of this invention. It is principal part sectional drawing which shows the wiring board case which concerns on embodiment of this invention. It is a block diagram which shows the electrical structure of the vacuum cleaner which concerns on this embodiment.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. In addition, the following description is an illustration in all the points, Comprising: It should not be interpreted as limiting this invention.

[Overall description of the vacuum cleaner]
FIG. 1 is an external perspective view of a vacuum cleaner according to an embodiment of the present invention, and FIGS. 2 and 3 are a plan view and a side view of a vacuum cleaner body of the vacuum cleaner shown in FIG.

  As shown in these drawings, the vacuum cleaner 1 includes a vacuum cleaner body 100 in which a cyclone type dust collection unit 500 is detachably incorporated, and a suction hose portion 300.

  The suction hose part 300 includes a suction hose 301, an extension pipe 302, a suction part 303 connected to the tip of the extension pipe 302, a hand handle 304, an operation part 305 attached to the hand handle 304, and a connection part 306. Is provided.

  The suction hose 301 is detachably connected to the front of the cleaner main body 100 via the connection portion 306, and the user holds the hand handle 304 by hand while bringing the suction portion 303 at the tip of the extension pipe 302 into contact with the floor surface. Can be moved.

  Since the vacuum cleaner main body 100 is provided with a pair of ring-shaped wheels 140 on both sides and a free wheel 117 at the lower front, when the user moves while holding the hand handle 304 by hand, The operation can be followed.

  The vacuum cleaner main body 100 sucks dust on the floor together with air from the suction portion 303 to the dust collecting unit 500 via the extension pipe 302 and the suction hose 301.

  The user visually checks the dust collection status of the dust collection unit 500 inside the vacuum cleaner main body 100 from the central opening 141 of the ring-shaped wheel main body 110, and pulls out the dust collection unit 500 from the upper part of the vacuum cleaner main body 100 as appropriate. Dust collected in the unit 500 can be discarded.

  As shown in FIG. 2, a power cord insertion plug 131 of a cord reel (described later) and a brake button 132 for adjusting the length of the power cord are provided on the upper rear portion of the vacuum cleaner main body 100. .

  Further, since the cleaner body 100 includes the hand handle 115, the user can hold the hand handle 115 and lift and transport the cleaner body 100.

  4 to 7 are exploded perspective views of the cleaner body 100, FIG. 8 is a cross-sectional view taken along arrow AA in FIG. 2, and FIG. 9 corresponds to FIG. 8 in a state where the dust collection unit 500 is removed from the cleaner body 100. 10 and 10 are cross-sectional views taken along line BB in FIG. The configuration of the cleaner body 100 will be described with reference to these drawings.

  The vacuum cleaner main body 100 has an elongated cart 101 (see FIG. 4) constituting a lower portion thereof, and a lower first casing 102 (see FIG. 5) that is installed in front of the cart 101 and accommodates the electric blower 106 (see FIG. 5). See). Further, a second housing 103 (see FIG. 4) that constitutes a dust collection chamber 150 installed in the center of the carriage 101 to accommodate the dust collection unit 500, and a cord reel 108 installed in the rear of the carriage. A third housing 107 (see FIG. 7) is provided. An exhaust port 133 is formed in the third housing 107.

  The electric blower 106 (see FIG. 5 and FIG. 8) is installed in the lower first housing 102 via a pedestal 122 (see FIG. 5) so that the rotation axis direction, that is, the blowing direction is directed in the direction of gravity. . A lower first housing cover 104 and a duct 105 shown in FIG. 6 are mounted on the lower first housing 102.

  The lower first housing cover 104 (see FIG. 6) includes a horizontal relay duct 104a and a vertical relay duct 104b on the upper surface. The duct 105 is provided to connect the outflow duct 571 (see FIG. 11) of the dust collection unit 500 to the vertical relay duct 104b (see FIG. 6) via the packing 124.

  The vertical relay duct 104 b is provided to connect the duct 105 to the electric blower 106. Packings 125 and 126 are respectively attached to the entrances and exits of the lateral relay duct 104a (see FIG. 6).

  The horizontal relay duct 104a is used to connect the connecting portion 306 (see FIGS. 1, 3 and 10) of the suction hose portion 300 to the inlet 503 (see FIG. 11) of the dust collecting unit 500 via the packings 125 and 126. Is provided.

As a result, the flow path from the connection part 306 of the suction hose part 300 to the inlet 503 of the dust collection unit 500 through the horizontal relay duct 104a, the duct 105 and the vertical relay duct 104b from the outflow duct 571 of the dust collection unit 500 are connected. A flow path to the electric blower 106 is formed.
Further, the inlet of the duct 105 connected to the outlet from the outlet duct 571 of the dust collecting unit 500 and the inlet of the horizontal relay duct 104a from the connecting part 306 of the suction hose part 300 are formed on the same surface side. . This is because the dust collection unit 500 is likely to be stable because the inlet is pulled in the same direction by the suction force of the electric blower 106 when cleaning.
A terminal portion 104c (see FIG. 6) for connecting a terminal (not shown) of the connecting portion 306 to the cleaner body 100 is provided on a side surface of the horizontal relay duct 104a and is covered with a terminal cover 123 from the outside. The printed wiring board 120 of the vacuum cleaner main body 100 and the operation unit 305 of the suction hose unit 300 are connected by wiring via the terminal and the terminal unit 104c.

  The lower first housing 102 includes a wiring board case 102a (see FIGS. 5 and 8) extending rearward. A printed wiring board 120 is accommodated in the wiring board case 102a, and a case bottom plate 119 is mounted. As shown in FIG. 5, the lower first housing 102 includes a perforated plate 121 inserted between the electric blower 106 and the printed wiring board 120. The perforated plate 121 is a resin perforated plate.

  The lower first housing 102 (see FIG. 5) configured as described above is fixed to the front of the carriage 101, and the upper first housing 114 (see FIG. 6) having a hand handle 115 is mounted thereon. .

  On the other hand, the second casing 103 (see FIG. 4) installed in the center of the carriage 101 includes an upper opening 103a at the top, windows 103b on both sides, and a ring-shaped window frame 103c around the window 103b. .

  In addition, a lower flow path 138 (see FIG. 8) is formed between the bottom of the second housing 103 and the carriage 101 for flowing the air flow discharged from the electric blower 106 toward the third housing 107. Is done.

  Behind the carriage 101 are provided a cord reel 108 (see FIG. 7) for winding a power cord (not shown) so that it can be pulled out, and cord reel support plates 127, 128 for rotatably supporting the cord reel 108. They are covered by the third casing 107 (see FIG. 7).

  The third housing 107 accommodates the cord reel 108 so that the reel axis is parallel to the longitudinal direction of the carriage 101. Further, the third housing 107 includes an exhaust port 133 for discharging an air flow generated by the electric blower 106 and flowing through the lower flow path 138 to the rear of the cleaner body 100 via the cord reel 108. As a result, the power cord wound around the cord reel 108 is cooled when energized.

  A pair of arc-shaped reinforcing beams 109 shown in FIG. 4 are fixed to the carriage 101 so as to be coupled to the upper half of the ring-shaped window frame 103a of the second housing 103, and as shown in FIG. The first housing 114 and the third housing 107 are connected. As a result, the longitudinal rigidity of the cleaner body 100 is reinforced. The pair of reinforcing beams 109 together with the lower second housing 103 form a dust collection chamber 150 that houses the dust collection unit 500.

  Then, as shown in FIG. 4, a ring-shaped wheel 140, that is, a ring-shaped wheel guide 111, a ring-shaped wheel body 110, a ring-shaped wheel cover 112, and a circle from both sides of the semicircular arc-shaped reinforcing beam 109 and the carriage 101. An arcuate decorative cover 113 is attached.

  As shown in FIGS. 8 to 10, the dust collecting unit 500 is disposed between the pair of reinforcing beams 109 from above the cleaner body 100 with respect to the cleaner body 100 configured in this manner. It is loaded into the second casing 103 through the upper opening 103a (see FIG. 4).

The free wheel 117 is provided at a position directly below the electric blower 106 so as to be rotatable and turnable on the outer bottom surface of the carriage 101 via a free frame 116 (see FIG. 4).
Thus, the electric blower 106 is in front, the center of gravity is forward, and the free wheel 117 is also provided on the lower side of the electric blower 106, so that the front of the cleaner main body 100 can be prevented from floating when cleaning. The movement of the vacuum cleaner main body 100 due to the pulling of the suction hose 301 can be easily followed.

  Thus, in the vacuum cleaner main body 100, the electric blower 106, the dust collection unit 500, and the cord reel 108 are arranged in a line in the longitudinal direction from the front of the carriage 101 (the connection side of the suction hose part 300), and the flow path is Since they are provided above and below them, the width of the vacuum cleaner main body 100 is minimized.

  FIG. 11 is an external perspective view of the dust collection unit 500. 12 is a cross-sectional view of the dust collection unit 500 taken along the line AA in FIG. The dust collection unit 500 includes a cup cover unit 570, a filter unit 550, an inner cylinder unit 530, and a bottomed cylindrical dust cup 501.

  The dust cup 501 is formed of a transparent or translucent resin so that the dust collection state is visible from the outside. As shown in FIG. 11, an inflow port 503 into which an air flow from the suction hose unit 300 (see FIG. 1) flows is provided on the front peripheral surface of the dust cup 501.

Referring to FIG. 10, the connection portion 306 of the suction hose portion 300 is bent from the center of the cleaner body 100 so that air flows straight into the inner circumferential surface of the cylindrical dust cup 501 from its tangential direction. doing.
Referring to FIG. 12, the inner cylinder unit 530 includes an upper cup cover 537 that houses the filter unit 550, a lower dust partition 535, and an inner cylinder 533 that connects between them. An opening is formed at the bottom of the cup cover 537 to which the inner cylinder 533 is connected. A slit-like outlet 533b is formed around the inner cylinder 533, and a mesh-like filter (not shown) is disposed at the outlet 533b. The dust partition 535 includes a flange portion 535 a having an outer diameter larger than that of the inner tube 533, a large-diameter tube portion 535 b surrounding the outer periphery of the flange portion, and a small-diameter tube portion 535 c whose lower end is in contact with the bottom center portion of the dust cup 501.

  When the electric blower 106 is operated, the air flow flows straight into the dust cup 501 in the circumferential tangent direction via the connecting portion 306 and the lateral relay duct 104a, and forms a high-speed swirling air flow in the dust cup 501.

Thereby, the dust contained in the airflow is centrifuged. Since the dust collecting unit 500 is installed so that the central axis of the swirling airflow to be formed faces the direction of gravity, the heavy dust among the centrifugally separated dust is accumulated below the flange portion 535a by the action of gravity. .
Here, the center axis of the swirling airflow of the dust collection unit 500 being directed in the direction of gravity does not require the center axis of the swirling airflow to be directly below, and the dust collection unit 500 is directed to the cleaner body 100 in the vertical direction. It only has to be arranged.

  A light thing is filtered with the mesh-like filter arrange | positioned in the outflow port 533b with an air flow. In addition, minute dust rises in the inner cylinder 533 through the outlet 533b and is filtered by the filter unit 550. The filter unit 550 includes a pleated filter in which a peak portion and a valley portion are continuous. The filtered air flow is sucked into the electric blower 106 through the outflow duct 571.

FIG. 13 is an explanatory view showing airflow paths in the cleaner body 100 shown in FIG.
As shown in the figure, the air flow from the suction hose 301 flows into the dust collection unit 500 through the connection portion 306 and above the electric blower 106.

  The inflowing air flow becomes a swirl flow in the dust cup 501 of the dust collection unit 500. After the dust collection is centrifuged, the air flow rises in the inner cylinder 533, passes through the filter unit 550, passes through the electric blower 106, and is below the dust collection unit 500 in the vertical direction of the carriage 101. Enters the lower flow path 138 formed in The swivel axis is slightly tilted rearward with respect to the vertical direction. When viewed from the side as shown in FIG. 13, the flow path flowing into the dust cup 501 from the connection portion 306 is substantially orthogonal to the pivot axis.

  The air flow passes through the wiring board case 102 a installed in the lower flow path 138 while cooling the printed wiring board 120, and then is distributed through the cord reel 108. The dispersed air flow is discharged to the outside from an exhaust port 133 provided on the back surface of the third housing 107.

  Therefore, the noise that tries to go out from the electric blower 106 in the air flow is attenuated by the long lower flow path 138 formed in the vertical direction of the carriage 101 below the dust collection unit 500, and the lower flow path. It is dispersed and absorbed by the wiring board case 102 a in 138 and the cord reel 108 in the third housing 107. Thereby, the noise of the electric blower 106 going out from the cleaner body 100 is effectively reduced.

  Further, as shown in FIG. 13, the flow path of the air flow is provided separately at the upper part and the lower part of the cleaner body 100 and is not provided at the side surface portion, so the lateral width of the cleaner body 100 is minimized. ing.

[Configuration and arrangement of perforated plate]
Details of the configuration and arrangement of the perforated plate 121 will be described.
As shown in FIG. 5, the perforated plate 121 is attached to the lower first housing 102 and is inserted between the electric blower 106 and the printed wiring board 120.

  FIG. 14 is an external perspective view of the lower first housing 102. What is indicated by a two-dot chain line in FIG. 14 is a location and insertion direction in which the perforated plate 121 is inserted into the lower first housing 102 and attached. The lower first housing 102 is roughly divided into a housing part for the electric blower 106 and a wiring board case 102a extending rearward therefrom. Side walls 102b are provided on both sides of the boundary between the two, and the perforated plate 121 is inserted and attached to the lower first housing 102 from above along the side walls 102b. Guides 102c are respectively formed on both sides of the bottom of the lower first housing 102 to position the lower portion of the inserted perforated plate 121. The guide 102c is formed near the side wall 102b, and is arranged such that the distance from the side wall 102b becomes narrower from the top to the bottom.

15 and 16 are views showing the perforated plate 121, FIG. 15 is an external perspective view, FIG. 16A is a front view, and FIG. 16B is a cross-sectional view taken along line DD in FIG. .
The perforated plate 121 is a resin member including a rectangular flat plate 121a and a frame 121b in which a large number of holes are formed. The diameter of each hole of the perforated plate 121 is 1.4 mm as an example. An example of the material is ABS resin. For example, a perforated plate can be made of steel mesh or punching metal, but a metal plate is not preferable because it does not have insulating properties and has a large mass. For example, a resin is preferable because it has insulating properties and has a smaller mass than metal. However, in consideration of safety (flame retardant) in the event of a fire or smoke accident, a material that easily burns is not preferable. Fortunately, the flame retardancy of resin materials is regulated by safety standards. A representative safety standard is the UL standard. And some standards (flame retardant grade) are prescribed about flame retardance. For example, it is a flame retardant grade such as 94V2, 94V1, and 94V0. Of these, resin materials that meet any of the standards are available. For the perforated plate 121, it is preferable to use a resin suitable for any flame retardant grade.

  The lower part of FIGS. 16A and 16B is the tip in the insertion direction. The lower end of the frame 121b protrudes in a convex shape at the center to correspond to the shape of the bottom of the lower first housing 102, and the center of the upper end is bent sideways to form a rectangular positioning hole 121c ( FIG. 15). The rib 102d formed in the lower first housing 102 is fitted into the rectangular hole to position the upper end of the perforated plate 121. As shown in FIG. 16 (b), the frame of the perforated plate 121 increases in thickness as it goes upward from the lower end and becomes thinner above the central portion and has almost the same thickness as the flat plate. The portion where the thickness of the frame is tapered toward the lower end is the portion sandwiched between the side wall 102b and the guide 102c, and the perforated plate 121 is firmly fixed to the lower first housing 102 as it is inserted deeper. Is done.

  FIG. 17 is a cross-sectional view taken along the line CC in FIG. FIG. 17 shows a state in which the front is viewed from the wiring board case 102a. As shown in FIGS. 5 and 17, a printed wiring board 120 is accommodated in the wiring board case 102 a, and its upper side and side are surrounded by the wiring board case 102 a, and the lower side is surrounded by the case bottom plate 119. The wiring board case 102a and the case bottom plate 119 are formed with a number of holes for allowing air to partially pass therethrough.

  The printed wiring board 120 has a heat radiating plate 120a, and an electric blower 106 is disposed in front of the heat radiating plate 120a. The heat sink 120a is made of aluminum, and the case of the electric blower 106 is made of metal. However, both are arranged at intervals, and a perforated plate 121 is arranged between the printed wiring board 120 and the electric blower 106 to ensure insulation. The air sucked by the electric blower 106 flows into the wiring board case 102 a through the perforated plate 121 after cooling the electric blower 106. Then, the printed wiring board 120 is cooled and flows to the lower lower flow path 138.

  The perforated plate 121 is made of a flame retardant resin. Specifically, it is made of an ABS resin that complies with UL flame retardant grade 94V0. This is an example and may be a different flame retardant grade or a different material. The same applies to other members surrounding the printed wiring board 120, that is, the lower first housing 102 and the case bottom plate 119.

  FIG. 18 is a block diagram showing an electrical configuration of the vacuum cleaner according to this embodiment, and shows a circuit mounted on the printed wiring board 120. As shown in FIG. 18, the vacuum cleaner 1 is centered on the control unit 220, the temperature rise detection unit 222 b, the operation unit 305, the buzzer unit 225, the electric blower 106, the blower drive circuit 222, the blower current detection unit 222 a, the brush A drive motor 211, a brush drive circuit 221 and a power supply unit 223 are included. Among these, on the printed wiring board 120, a control unit 220, a blower drive circuit 222, a blower current detection unit 222 a, a temperature rise detection unit 222 b, a brush drive circuit 221 and a power supply unit 223 are mounted.

  The control unit 220 includes a microcomputer in which a vacuum cleaner control program is stored in a ROM and peripheral circuits.

  The blower drive circuit 222 is a circuit that drives the electric blower 106 based on the control of the control unit 220. In this embodiment, a universal motor having a large starting torque and suitable for high-speed rotation is applied to the electric blower 106. The blower drive circuit 222 includes a blower current detection unit 222 a that detects the current of the electric blower 106. The detected current value is input to the control unit 220. The current value has a correlation with the load size of the electric blower, and the correlation characteristic is experimentally obtained at the design stage. Since the magnitude of the load of the electric blower varies depending on the degree of clogging of the mesh filter disposed in the filter main body 551a and the outlet 533b, the clogging of the filter can be detected by detecting the electric current of the electric blower 106.

  The temperature rise detection unit 222b detects the temperature of the air flow after passing through the electric blower 106. A thermistor can be used for temperature detection. Since the printed wiring board 120 is disposed on the downstream side near the electric blower 106 (see FIGS. 5 and 8), the temperature rise detection unit 222b detects the temperature of the airflow passing through the printed wiring board 120, and the temperature The abnormal temperature rise of the electric blower 106 can be detected based on the above.

  The brush drive circuit 221 is a driver circuit for the brush drive motor 211. The brush drive motor 211 is a small DC motor that drives an electric rotating brush (not shown) of the suction portion 303, and is disposed beside the electric rotating brush.

The power supply unit 223 provides DC power to the control unit 220, the operation unit 305, the buzzer unit 225, and the like.
The control unit 220 controls the electric blower 106 via the blower drive circuit 222 in response to the operation of the “ON” button and “OFF” button arranged on the operation unit 305. It also controls various input processes or displays. The blower current detection unit 222 a detects the current flowing through the electric blower 106 and inputs it to the control unit 220. In addition, when filter clogging is detected by the blower current detection unit 222a, a “filter maintenance” lamp disposed in the operation unit 305 is turned on to prompt the user to remove the filter dust.

  As described above, the vacuum cleaner of the present invention includes a dust collection unit that separates and collects dust sucked with air from the air, an electric blower that generates an air flow for sucking the dust, and An exhaust path for discharging the airflow that has passed through the electric blower to the outside, a circuit board that includes a circuit that controls the electric blower, and that is disposed in the exhaust path, and is disposed between the electric blower and the circuit board. And a perforated plate.

Furthermore, the preferable aspect of this invention is demonstrated.
The perforated plate may be made of a flame retardant resin. In this way, even if the circuit board burns, it can be difficult to spread to the electric blower side, and the user can be protected by pulling. Here, the flame retardant resin refers to a resin that conforms to any flame retardancy standard (flame retarding grade) defined in a safety standard (for example, UL standard). For example, a flame retardant resin is applied. As a more specific example, an ABS resin that complies with the flame retardant grade 94V0 defined in the UL standard is used.

  Furthermore, the circuit board may be surrounded by a flame retardant member made of a flame retardant resin, and the perforated plate may constitute a part of the flame retardant member. In this way, even if the circuit board burns, it becomes difficult to spread to the surroundings, and the user can be protected by pulling it. In the above-described embodiment, the lower first casing 102 and the case bottom plate 119 correspond to the flame retardant member.

  Further, the perforated plate may be made of an insulating resin. If it does in this way, between an electric blower and a circuit board can be insulated with a perforated plate, and an emergency short circuit can be prevented. An example of the insulating resin is ABS resin.

  The exhaust path may have a guide portion for inserting and fixing the perforated plate. If it does in this way, since the said perforated plate can be fixed only by inserting along a guide part, an assembly | attachment can be performed easily. In the above-described embodiment, the guide 102c corresponds to the guide portion.

Further, the electric blower is disposed in the cleaner body on the front side of the dust collection unit, and the exhaust path guides air to the rear of the cleaner body through the electric blower and the lower part of the dust collection unit. May be released. In this way, since the circuit board can be arranged in the exhaust path passing below the dust collection unit, the main body of the cleaner can be reduced in size and size.
Preferred embodiments of the present invention include combinations of any of the plurality of embodiments shown here.

More specifically, the dust collection unit may be, for example, a cyclone type that centrifuges dust, but is not limited thereto, and may be, for example, a paper bag type. The above-described embodiment is a cyclone type dust collection unit.
Generally, a universal motor having a commutator and a brush is applied to the electric blower of the vacuum cleaner. However, the present invention is not limited to this, and other motors may be applied as long as they can generate an airflow that sucks dust. .
The circuit board is disposed in the exhaust path for cooling. A part of the airflow that has passed through the electric blower may be bypassed in order to cool the circuit board. It is preferable to do.
The lower first casing, the wiring board case, and the lower flow path in the embodiment described above are one aspect of the exhaust path of the present invention. The printed wiring board in the embodiment is an aspect of the circuit board of the present invention.
In addition to the embodiments described above, there can be various modifications of the present invention. These modifications should not be construed as not belonging to the scope of the present invention. The present invention should include the meaning equivalent to the scope of the claims and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1: Electric vacuum cleaner, 100: Vacuum cleaner main body, 101: Carriage, 102: Lower 1st housing | casing, 102a: Wiring board case, 102b: Side wall, 102c: Guide, 102d: Rib, 103: 2nd housing | casing, 103a : Upper opening, 103b: Window, 103c: Window frame, 104: Lower first housing cover, 104a: Horizontal relay duct, 104b: Vertical relay duct, 104c: Terminal section, 105: Duct, 106: Electric blower, 107: Third housing 108: Cord reel 109: Reinforcement beam 110: Ring-shaped wheel body 111: Ring-shaped wheel guide 112: Ring-shaped wheel cover 113: Arc-shaped decorative cover 114: Upper first housing 115: Hand handle, 116: Swivel frame, 117: Swivel wheel, 119: Case bottom plate, 120 Printed wiring board, 120a: heat sink, 121: perforated plate, 121a: flat plate, 121b: frame, 121c: positioning hole, 122: pedestal, 123: terminal cover, 124, 125, 126: packing, 127, 128: cord Reel support plate, 131: Plug, 132: Brake button, 133: Exhaust port, 138: Lower flow path, 140: Ring-shaped wheel, 141: Central opening, 150: Dust collection chamber, 211: Brush drive motor, 220: Control unit, 221: brush drive circuit, 222: blower drive circuit, 222a: blower current detection unit, 222b: temperature rise detection unit, 223: power supply unit, 225: buzzer unit, 300: suction hose unit, 301: suction hose, 302: Extension pipe 303: Suction part 304: Hand handle 3 5: Operation part, 306: Connection part, 500: Dust collection unit, 501: Dust cup, 503: Inlet, 530: Inner cylinder unit, 533: Inner cylinder, 533b: Outlet, 535: Dust partition, 535a: Flange Part, 535b: large diameter cylindrical part, 535c: small diameter cylindrical part, 537: cup cover, 550: filter unit, 570: cup cover unit, 571: outflow duct

Claims (3)

A dust collecting unit that separates and collects dust sucked together with air;
An electric blower for generating an air flow for sucking the dust;
An exhaust passage for releasing the airflow that has passed through the electric blower to the outside;
A circuit board including a circuit for controlling the electric blower and disposed in the exhaust path;
A perforated plate disposed between the electric blower and the circuit board ;
The perforated plate is made of a flame retardant resin,
The circuit board is surrounded by a flame retardant member made of a flame retardant resin, and the perforated plate constitutes a part of the flame retardant member . The vacuum cleaner according to claim 1 , wherein the exhaust passage has a guide portion for inserting and fixing the perforated plate. The electric blower is disposed in the cleaner body on the front side of the dust collection unit, and the exhaust path guides air to the rear of the cleaner body through the electric blower and the dust collection unit and releases the air to the outside. The electric vacuum cleaner according to claim 1 or 2 .