JP2500940B2 - Electric vacuum cleaner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric vacuum cleaner that eliminates harmful microorganisms such as mites sucked into a dust collection chamber by using exhaust heat of an electric blower.

(Prior Art) Conventionally, as described in, for example, JP-A-1-119220, a temperature of the dust collection chamber rises by generating a circulating air flow that repeatedly passes through an electric blower that generates heat and the dust collection chamber. There is known an electric vacuum cleaner that removes ticks and the like contained in dust accumulated there. By the way, in the conventional electric vacuum cleaner, as described in JP-A-1-119220, a dust collection chamber formed in a main body case in which an electric blower is installed is opened upward for dumping dust. With
There is known an electric vacuum cleaner in which this opening is covered by a lid so as to be openable and closable from above and a suction port to which a dust suction hose is connected is provided in the lid. On the other hand, in order to recirculate the exhaust air from the electric blower to the dust collection chamber for the elimination of ticks, it is most effective to recirculate it through the suction port, and therefore, it is described in JP-A-1-119220. The electric vacuum cleaner has a structure in which a recirculation air passage for guiding the exhaust air of the electric blower to the suction port is provided in the lid body, and the outlet of the recirculation air passage is opened horizontally in the suction port. . The outlet of the return air passage is closed by a hose connected to the suction port during cleaning.

On the other hand, in the electric vacuum cleaner having the suction port on the front surface of the main body case, when the return air passage is provided in the main body,
As described in JP-A-1-195825, it is advantageous in terms of manufacturing and design to provide a return air passage from the lower surface portion to the front surface portion of the main body case, but it is described in JP-A-1-195825. The vacuum cleaner has a structure in which the outlet of the return air passage is opened from below to the suction port. Further, in the electric vacuum cleaner disclosed in JP-A-1-195825, a cylindrical opening / closing switching means for rotatably providing switching between the circulation air passage, the suction port, and the dust collecting chamber is provided. However,
As described in JP-A-1-119220,
It is advantageous in terms of manufacturing and downsizing that the hose closes the outlet of the return air passage to the suction port and the suction port is closed by another plate-shaped shutter.

However, in these Tokaihei 1-195825 and Tokaihei 1-119220 publications, if the outlet to the inlet of the recirculation air passage is opened upward, dust attached to the opening / closing switching means or the hose will be hose. When attaching / detaching, it is easy to fall into the return air passage from the suction port. When the dust enters the recirculation air passage, this air passage is closed and the flow of exhaust air is prevented.

Further, the electric vacuum cleaner described in JP-A-1-119220 has a structure in which the outlet to the suction port of the return air passage is opened in the horizontal direction. Dust easily enters the air passage.

As described in, for example, Japanese Patent Laid-Open No. 64-7774, the exhaust port of the vacuum cleaner main body is connected to the suction port on the front surface of the vacuum cleaner main body. An electric vacuum cleaner formed on the rear surface is also known, but if the hose outside the main body of this vacuum cleaner is used as a return air passage, heat is easily taken away while exhaust air blows through the hose, resulting in poor efficiency. There are problems such as.

(Problems to be Solved by the Invention) As described above, in the conventional electric vacuum cleaner, the outlet to the suction port of the recirculation air passage in the cleaner main body is opened horizontally or upward, and therefore the hose is attached / detached. There is a problem that dust easily falls into the suction at times and the smoothness of the exhaust air flow can be prevented.

The present invention is intended to solve such a problem and has a simple structure in which dust does not enter the recirculation air passage that guides the exhaust air of the electric blower to the suction port, and the exhaust air always circulates smoothly. The purpose is to provide a vacuum cleaner. Another object of the present invention is to increase the strength of the main body of the vacuum cleaner at low cost.

(Means for Solving the Problems) An electric vacuum cleaner according to claim 1, wherein the electric blower chamber and the dust collecting chamber are defined inside and a cleaner main body having a suction port communicating with the dust collecting chamber, An electric blower built in the electric blower chamber with the suction side communicating with the dust collection chamber, a hose having a connection pipe detachably connected to the suction port, and the electric motor provided in the cleaner body. A recirculation air passage that connects the exhaust side of the blower to the suction port, the outlet of the recirculation air passage to the suction port is the upper surface of the suction port, and of a hose connected to the suction port. The opening is formed downward at the position closed by the connecting pipe.

The electric vacuum cleaner according to claim 2, wherein the electric blower chamber and the dust collecting chamber are defined inside, and the main body case has a suction opening communicating with the dust collecting chamber; and the suction opening attached to the main body case. A suction port body having a suction port that communicates with the opposite part, an electric blower built in the electric blower chamber with the suction side communicating with the dust collection chamber, and a wheel device attached to the lower surface of the main body case, A hose having a connection pipe detachably connected to the suction port,
The main body case includes a suction port body mounting portion having the suction opening portion to which the suction port body is mounted, a wheel mounting portion which is provided on a lower surface to mount the wheel device, and a lower surface portion to the outside of the suction port body mounting portion. And a cover that covers the air passage groove from the outside with a lower surface portion, and the suction opening body mounting portion covers the air passage groove from the outside, and the air passage groove, the cover, and the suction opening body. And a recirculation air passage that connects the exhaust side of the electric blower to the suction port, and the outlet of the recirculation air passage to the suction port is at the upper surface of the suction port, and Form a downward opening at the position where it is blocked by the connection pipe of the hose connected to the mouth,
A part of the air passage groove is formed along the outer periphery of the wheel mounting portion on the lower surface portion of the main body case.

(Operation) In the electric vacuum cleaner according to claim 1, when cleaning is performed with the hose connection pipe connected to the suction port of the cleaner body, the connection port of the hose closes the outlet of the return air passage to the suction port. Then, in this state, by driving the electric blower, the dust sucked with air from the outside into the hose is guided into the dust collecting chamber and captured. Also, when eliminating harmful microorganisms such as mites in the dust stored in the dust collection chamber, remove the hose connection pipe from the suction port and open the outlet to the suction port of the recirculation air passage in the cleaner body itself. When the electric blower is driven by connecting the exhaust side of the electric blower to the suction port, the heated exhaust air from the electric blower is recirculated from the suction port to the dust collection chamber through the recirculation air passage, and the electric blower and the recirculation air passage. A circulating air flow is repeatedly passed through the suction port, the dust collection chamber, and the electric blower in this order, the temperature inside the dust collection chamber rises, and the mites in the dust collection chamber are killed by the heat. By the way, when attaching / detaching the hose connection pipe, the dust adhering to the hose connection pipe is likely to fall off, but the dust that has fallen off is found at the outlet to the suction port of the return air passage. Since it opens downward on the upper surface, it does not fall into the return air passage.

In the electric vacuum cleaner according to claim 2, when cleaning is performed with the hose connection pipe connected to the suction port, the hose connection pipe is attached to the suction port body that is attached to the main body case so as to face the suction opening. The outlet of the return air passage to the suction port is closed, and the dust is guided into the dust collection chamber and captured by the drive of the electric blower. Also, when eliminating harmful microorganisms such as mites in the dust stored in the dust collection chamber, remove the hose connection pipe from the suction port, and the air passage groove on the outside of the main body case and the cover installed covering it. When an electric blower is driven by opening the outlet of the recirculation air passage formed by the suction air inlet body to the suction port and communicating the exhaust side of the electric blower with the suction port, the heated exhaust air from the electric blower is recirculated. The dust is returned from the suction port to the dust collection chamber through the passage, the temperature inside the dust collection chamber rises, and the mites in the dust collection chamber are killed by heat. Further, since the outlet of the return air passage to the suction opening opens downward on the upper surface of this suction opening, dust does not fall into the return air passage when the connecting pipe of the hose is attached or detached. Further, since the air passage groove is provided along the outer periphery of the wheel mounting portion for mounting the wheel device for traveling the main body case at the time of cleaning or the like on the lower surface portion of the main body case, the strength of the wheel mounting portion is increased.

(Example) Hereinafter, the structure of one example of the vacuum cleaner of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is a cleaner body, and the cleaner body 1 includes a lower body case 2 having an open upper surface, and an upper body case 3 to a body case coupled and fixed to a rear upper side of the lower body case 2. And a lid 5 for closing the dust-discharging opening 4 at the front part of the upper surface of the lower main body case 2 of the main body case so as to be openable and closable from below.

And, on the lower left and right side surfaces of the lower body case 2,
As shown in FIG. 3, an axle 11 is formed so as to project outward in the left-right direction, and a rear wheel 12 is rotatably supported on each axle 11. Further, as shown in FIG. 3, a circular recessed front wheel mounting portion 13 that is a wheel mounting portion that is recessed upward is formed in the center portion in the left-right direction of the lower surface front portion of the lower body case 2. A support shaft 14 is formed at the center of the front wheel mounting portion 13 so as to project downward. A swivel base 16 of front wheels 15 that are wheel devices is horizontally rotatably supported on the support shaft 14, and wheels 17 are axially attached to the swivel base 16 with the horizontal direction being the rotational axis direction.

Further, in the cleaner main body 1, a partition chamber 22 having a grid-like communication port 21 defines a dust collection chamber 23 having the opening 4 on the upper surface at the front part, and the dust collection chamber 23 is formed. An electric blower chamber 24 is formed in the rear of the compartment.

Then, in the dust collecting chamber 23, a paper dust collecting bag 26 which is a dust collecting filter is detachably mounted. This dust bag 26
Is the bag-like filter material 27 and the mouth frame adhered to the opening side.
28, and the mouth frame 28 is detachably held by a clamp 29 pivotally attached to the upper part of the front surface in the dust collecting chamber 23 and a holding portion 30 formed at the lower part of the same front surface. . Further, an auxiliary dust collecting filter 31 that covers the communication port 21 of the partition 22 from the dust collecting chamber 23 side is detachably attached to the partition 22. In addition, these dust collecting bag 26 and auxiliary dust collecting filter 31
Is attached and detached via the opening 4.

On the other hand, an electric blower 36 is arranged in the electric blower chamber 24. The front and rear parts of the electric blower 36 are sandwiched by the support walls 37 and 38, which are formed integrally with the lower main body case 2 and the upper main body case 3, respectively, through rubber support members 40 and 41. The front side support wall 37 and the support body 40 are formed in an annular shape, whereby the electric blower 24
The intake side of the electric blower 36 therein is communicated with the dust collection chamber 23 through the communication port 21 while maintaining airtightness with the exhaust side.

Further, a lattice-shaped exhaust port is provided on the rear surface of the upper body case 3.
An opening 42 is formed. The exhaust port 42 communicates with the exhaust side of the electric blower 36 via an air passage 43 formed in the lower main body case 2 and the upper main body case 3 on the side of the rear support wall 38.

Further, in the center of the front surface of the lower main body case 2, there is formed a recess 46 which is a suction port body mounting portion and which is pulled out in the vertical direction. The recess 46 is formed in a rearward recess. A suction opening 47 is formed so as to communicate with 23 from the front. Further, as shown in FIG. 2 in particular, two pairs of contact fixing portions 48 and 49 are formed on the bottom surface of the concave portion 46 which are respectively located on the left and right sides of the suction opening portion 47, and are screwed together. The part 50 is formed. Further, a rectangular suction port body fixing rib 51 is provided on the bottom surface of the recess 46 so as to surround them.
Are formed. Although not shown, contact plates are attached to the contact fixing portions 48 and 49, respectively.

Also, from the lower surface of the lower main body case 2 to the concave portion
Air passage groove that opens outward, that is, downward or forward
52 are formed. The rear end portion of the air passage groove 52 extends to the electric blower chamber 24 and communicates with the exhaust side of the electric blower 36. Further, as shown in FIG. 3, the air passage groove 52 is formed in a circular arc shape along the outer periphery of the front wheel mounting portion 13 at the central portion in the front-rear direction on the lower surface portion of the lower body case 2. further,
Both sides of the air passage groove 52 are formed of ribs, but the suction port body fixing ribs 51 also serve as ribs forming the air passage groove 52 on the bottom surface of the recess 46. The air passage groove 52 rises vertically in the recess 46, but is bent vertically toward the suction opening 47 at the same height as the upper portion of the suction opening 47. It comes out to the side of the car about 45 ° above the horizontal direction from its center.

An annular suction port packing 56 is fixedly attached to the peripheral edge of the suction opening 47. The back end of the suction port packing 56 is pressed against the mouth frame 28 of the dust collecting bag 26 so as to surround the opening and be freely contactable and separable.

On the other hand, 61 is a suction port body, and this suction port body 61 is a screw fastening part.
It is attached almost vertically to the front side of the recess 46 of the lower body case 2 with the suction port packing 56 sandwiched by screwing or the like at 50. Further, the front shape of the box-shaped suction port body 61 having an opening on the rear surface has a suction port body fixing rib 51.
The shape is substantially the same as that of (3) and covers the inside of the suction port body fixing rib 51 from the front outside. Along with this, the air passage groove 52 on the front surface of the lower body case 2 is provided on the side portion of the suction port body 61.
A cover portion 62 having substantially the same shape as that of the lower portion is vertically provided integrally. Thus, on the front surface of the lower main body case 2, the air passage groove 52 is airtightly covered from the front outside by the suction port body 61.

Further, the suction port body 61 is formed with a cylindrical suction port 63 which is in communication with the suction opening portion 47 of the lower main body case 2 and which comes out in the front-rear direction. The suction port body 61 has a cylindrical shape on the outer peripheral side thereof. The outer peripheral wall 64 is formed concentrically. The rear end of the outer peripheral wall 64 is airtightly attached to the suction port packing 56 together with the peripheral edge of the suction opening 47 of the lower body case 2. The front end of the suction port packing 56 is airtightly fitted to the outer peripheral side of the rear end of the suction port 63. Further, the outer peripheral wall 64 is cut out at a position overlapping the open end of the air passage groove 52, and an outflow port 66 is formed in the upper surface of the suction port 63. As a result, the inside of the suction port 63 communicates with the inside of the air passage groove 52 through the gap between the outer peripheral surface of the suction port 63 and the inner peripheral surface of the outer peripheral wall 64. Also, on both the left and right sides of the suction port 63, as shown in FIG.
Through holes 67 and 68 are formed to face the contact plates, respectively.

Further, as shown in FIG. 2, a normally-open shutter switch 71 is provided on the outer front surface of the suction port body 61 at the lateral side of the suction port 63. The shutter switch 71 has an opening / closing element 72 that is swingable in the vertical direction and urged downward, and is turned on when the opening / closing element 72 moves up.

A front cover 76 that covers the suction port body 61 from the lower front side is fixedly attached to the front surface of the lower body case 2. The front cover 76 includes a hook portion 77 formed on an upper portion thereof and a receiving portion formed on an upper edge portion of the lower main body case 2.
It is attached to the lower body case 2 by appropriate means such as engagement with 78 and screws. In addition, the front cover 76
A front opening 79 facing the suction port 63 and the through holes 67, 68 is formed in the center of the.

A shutter 81 that closes the suction port 63 of the suction port body 61 in an openable and closable manner is sandwiched vertically between the rear surface of the front cover 76 and the front surface of the suction port body 61. The shutter 81 closes the suction port 63 at the time of rising, but is held at the raised position by the engagement of the locking hole 82 formed in the suction port body 61 and the claw portion 83 formed in the shutter 81. It is like this. Further, the shutter 81 is formed with a pressing protrusion 84 for pressing and raising the opening / closing element 72 of the shutter switch 71 when the shutter 81 is raised, and a knob 85 for operation is provided on the front upper end portion. Has been formed.

Further, the air passage groove 52 is covered from the lower outside by an air passage cover 86 which is a cover on the lower surface portion of the lower main body case 2. The air passage cover 86 is formed by engaging the claw portion 87 formed at the front end portion thereof with the lower edge portion of the suction port body 61 and screwing the rear end portion to the boss of the lower body case 2. It is fixedly attached to the lower body case 2. Of course, it is also possible to lock the rear end of the air duct cover 86 with the claws. Thus, between the air passage groove 52 of the lower main body case 2 and the air passage cover 86 and the suction inlet body 61 that close the opening on the outside thereof, the air outlet is airtightly shielded from the outside, and the exhaust side of the electric blower 36 becomes the suction inlet 63. A return airflow passage 88 is formed to communicate with each other. Of course, the return air passage 88 is also communicated between the front end portion of the air passage cover 86 and the lower end portion of the suction port body 61 while maintaining airtightness from the outside. The outlet 66, which is the outlet of the return air passage 88 to the suction port 63, opens vertically downward as described above.

On the other hand, the lid 5 has, for example, a rear end portion pivotally attached to the upper main body case 3, and a front end portion releasably engaged with an upper end portion of the front cover 76 to be locked in a closed state. Is.
A seal packing 91 is provided on the peripheral edge of the dust-discharging opening 4 of the lower main body case 3 so that the peripheral edge of the lower surface of the closed lid 5 is pressure-contacted.

Further, a forced reset type temperature switch 92 is provided on the upper surface of the upper body case 3. This temperature switch
The reference numeral 92 indicates that the temperature inside the electric blower chamber 24 is detected, and the temperature is turned off when the temperature rises to a constant temperature of, for example, about 60 ° C. The temperature switch 92 is a button for forced recovery.
It has 93 and is turned on by pressing this button 93. The button 93 is exposed from an upper surface cover 94 fixed on the upper body case 3 and can be operated externally.

On the other hand, 101 is a dust suction hose, and the hose 101 has a connection pipe 102 provided at one end thereof detachably inserted and connected to the suction port 63. The outflow port 66 of the suction port 63 is at a position where it is closed by the connected connecting pipe 102. Although not shown, a suction tool is detachably connected to a grip tube (not shown) provided at the other end of the hose 101 via an extension tube. Further, the connection pipe 102 is provided with contact pins respectively connected to contact plates (not shown) near the suction port 63 on the cleaner body 1 side. One pair of contact plates and contact pins electrically connect the control circuit of the electric blower 36 provided in the cleaner body 1 to an operation unit (not shown) provided in the grip tube. The other pair of contact plates and contact pins are for supplying power to an electric brush (not shown) provided in the suction tool.

The electric blower 36 has an electrical configuration in which the electric blower 36 operates only when and when the pair of contact plates on one side are electrically connected to each other. Even when the switch 92 is connected in series and the connection pipe 102 is not connected to the suction port 63, if the shutter switch 71 and the temperature switch 92 are both turned on, the electric blower 36 operates. It has become.

 Next, the operation of the above embodiment will be described.

When cleaning, slide the shutter 81 downward to open it,
The connection pipe 102 of the hose 101 is connected to the opened suction port 63. Further, a suction tool is connected to a grip tube (not shown) of the hose 101 via an extension tube. The shutter
When 81 is opened, the shutter switch 71 is turned off in synchronization with it. Further, when the hose 101 is connected, the outlet pipe 66 of the return air passage 88 at the suction port 63 is connected by the connecting pipe 102.
Are hermetically closed. As a result, the exhaust side of the electric blower 36 and the suction port 63 are hermetically shut off from each other. In addition, connection pipe 10
The tip of 2 is inserted into the dust bag 26.

Then, by driving the electric blower 36, dust is sucked together with air from the outside through a suction tool (not shown), and the dust collection chamber 23 of the cleaner body 1 through the extension pipe and the hose 101.
To be trapped in the dust bag 26. Further, the air filtered by the dust collecting bag 26, the auxiliary dust collecting filter 31,
After passing through the communication port 21, the inside of the electric blower 36, the electric blower chamber 24, and the ventilation passage 43 in order, the exhaust air is discharged from the exhaust port 42 to the outside of the cleaner body 1.

When cleaning, hold the hose 101 grip tube and
5 and the rear wheel 12 are grounded, and the cleaner body 1 is appropriately run.

Also, as shown in the figure, first use a hose to eliminate harmful microorganisms such as mites in the dust stored in the dust bag 26.
The connection pipe 102 of 101 is pulled out and removed from the suction port 63, and the shutter 81 is slid upward to be closed to close the suction port 63 from the outside. In this state, the outlet 66 of the return air passage 88 is opened, and the exhaust side of the electric blower 36 communicates with the inside of the suction port 63 via the return air passage 88. In addition, as described above, the shutter 81
When is closed, the opening 72 is pressed from below by the pressing protrusion 84 of the shutter 81, and the shutter switch 71 is turned on. Then press the button 93 of the temperature switch 92 to turn on the temperature switch 92, and the electric blower 36
Starts working.

By this operation of the electric blower, the air in the dust collection chamber 23 is sucked into the electric blower 36 and discharged to the exhaust side in the electric blower chamber 24, but at this time, the air is heated by the heat generation of the electric blower 36. It Then, as shown by the arrows in FIGS. 1 and 2, the heated exhaust air from the electric blower 36 flows from the electric blower chamber 24 into the recirculation air passage 88, and the air passage on the air passage cover 86 side. After passing through the groove 52 and the air passage groove 52 on the side of the suction port body 61, the air is blown from the outflow port 66 into the suction port 63, and this suction port
Reflux from 63 through the suction opening 47 into the dust bag 26 of the dust chamber 23. That is, the exhaust heat of the electric blower 36 is absorbed by the dust bag 26.
Be guided inside. Further, since the exhaust air recirculated in the dust bag 26 returns from the dust collection chamber 23 to the electric blower 36, the electric blower 36, the return air passage 88, the suction port 63, the dust collection chamber 23, and the electric blower 36 are electrically driven. Circulating air is repeatedly passed through the blower 36 in this order. As a result, the temperature inside the dust collection chamber 23 rises, and harmful microorganisms such as mites inside the dust bag 26 are killed by heat.

When the temperature in the electric blower room 24 further rises and reaches the set temperature of the temperature switch 92, the temperature switch 92 is turned off and the electric blower 36 is automatically stopped. As a result, the temperature is prevented from rising more than necessary, and the electric blower 36 is prevented from being burned and the lower body case 2 and the upper body case 3 are deformed by heat.

By the way, the hose 10 is attached to the suction port 63 of the cleaner body 1.
When the connection pipe 102 of 1 is attached or detached, the dust adhering to this connection pipe 102, which is the outlet of the dust from the hose 101, is likely to fall off. However, the outlet 66, which is the outlet of the return air passage 88 to the suction port 63, opens vertically downward from above the suction port 63, which is downward on the upper surface of the suction port 63, toward the inside of the suction port 63. Therefore, the dust that has fallen out of the connecting pipe 102 into the suction port 63 as described above does not fall into the return air passage 88. Therefore, dust is not stored in the return air passage 88 and the return air passage 88 is not blocked.
The flow of exhaust air inside 88 is not obstructed. That is, the smoothness and certainty of the circulation of the exhaust air are maintained,
It is possible to always reliably eliminate ticks and the like due to the circulation of the exhaust air, and the electric blower 36 is not overloaded. Moreover, a dedicated valve body or the like for preventing the entry of dust into the return air passage 88 is unnecessary, and the structure is simple.

Further, since a part of the air passage groove 52 forming the circulation air passage 88 is arranged along the outer periphery of the front wheel mounting portion 13 on the lower surface portion of the lower body case 2, a load is applied as the cleaner body 1 travels. The strength of the front wheel mounting portion 13 can be increased. Of course, other than the front wheel mounting portion 13, the strength of the portion having the air passage groove 52 is improved. Therefore, it is possible to reduce the thickness of the lower main body case 2 and to reduce the number of dedicated reinforcing ribs to be formed on the inner surface of the lower main body case 2.
It is possible to reduce the cost of processing the mold or parts.

In the above embodiment, the return air passage is provided on the upper surface of the suction port 63.
Although 88 outlets 66 are provided, the outlets are provided on the upper surface above the left and right side surfaces of the suction port 63 even if it is not on the upper surface of the suction port 63.
By providing the outlet 66 and opening the outlet 66 toward the inside of the suction port 63 downward from the horizontal direction, it is possible to prevent dust from entering the return air passage 88. However, as in the above embodiment, it is most effective to provide the outflow port 66 vertically downward on the upper surface of the suction port 63.

(Effect of the invention) According to the electric vacuum cleaner of claim 1, the outlet to the suction port of the recirculation air passage that connects the exhaust side of the electric blower to the suction port is connected to the suction port. Since it is opened downward at the position where it is blocked by and on the upper surface of the suction port, there is no need to provide a dedicated valve element that blocks the outflow port,
With a simple structure, it is possible to prevent dust from entering the return air passage from the outlet when attaching and detaching the hose connection pipe, and the dust is stored in the return air passage and exhausted from the electric blower to the suction inlet. It is possible to prevent the flow of the exhaust gas and prevent the harmful microorganisms such as mites stored in the dust collection chamber from being extinguished by heat, and the exhaust air can be circulated smoothly and reliably at all times.

According to the electric vacuum cleaner of claim 2, the air passage groove formed in the main body case is covered with the suction port body having the suction port and the cover to form the recirculation air passage, and a part of the air passage groove is formed. Since it is formed along the outer periphery of the wheel mounting part on the bottom surface of the body, the strength of the main body case can be improved, including this wheel mounting part that is particularly loaded, and the wall thickness of the main body case can be reduced and the inner surface of the main body case It is possible to reduce the number of dedicated reinforcing ribs to be formed, and it is possible to reduce the cost of machining the mold or parts.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the electric vacuum cleaner of the present invention,
FIG. 2 is a front view of a main body case having a suction port body, etc.
FIG. 3 is a bottom view of the same main body case. DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner main body, 2 ... Lower main body case that constitutes the main body case, 3 ... Upper main body case that constitutes the main body case, 13 ... Front wheel attachment portion that is a wheel attachment portion, 15 ... Wheel device Front wheel, 23 ... Dust collection chamber, 24 ... Electric blower chamber, 36 ... Electric blower, 46 ... Recess that is a suction port body mounting part, 47 ... Suction opening, 52 ... Air passage groove, 61 ... … Suction port body, 63 …… Suction port, 66 …… Outlet port that is an outlet to the suction port of the return air passage, 86 …… Air passage cover that is a cover, 88 …… Return air passage, 101 …… Hose, 102 …… Connection tube.

Claims (2)

(57) [Claims] 1. A vacuum cleaner body having an electric blower chamber and a dust collection chamber defined therein and having a suction port communicating with the dust collection chamber, and the electric blower having an intake side communicating with the dust collection chamber. An electric blower built in the chamber, a hose having a connecting pipe detachably connected to the suction port, and a return air passage provided in the cleaner body for communicating the exhaust side of the electric blower with the suction port The outlet of the return air passage to the suction port is formed downward on the upper surface of the suction port and at a position closed by a connecting pipe of a hose connected to the suction port. An electric vacuum cleaner characterized in that. 2. A main body case having an electric blower chamber and a dust collection chamber defined therein and having a suction opening communicating with the dust collection chamber, and a body case attached to the main body case and communicating with the suction opening opposite to each other. A suction port body having a suction port,
An electric blower that is connected to the dust collection chamber on the intake side and is built in the electric blower chamber, a wheel device that is attached to the lower surface of the main body case, and a connection pipe that is detachably connected to the suction port. The main body case includes a suction port body mounting portion having the suction opening formed therein, the suction port body being mounted to the body case, a wheel mounting portion being mounted to the wheel device for mounting the wheel device, and the suction port being mounted from the bottom surface portion. An air passage groove formed on the outside of the attachment portion of the mouth body, a cover that covers the air passage groove from the outside with a lower surface portion, and an air passage groove that is covered from the outside by the suction mouth body at the suction mouth body attachment portion. A recirculation air passage that is formed between the groove and the cover and the suction port body and communicates the exhaust side of the electric blower with the suction port, and the outlet of the recirculation air channel to the suction port is On the upper surface and An opening is formed downward at a position where it is closed by a connecting pipe of a hose connected to the inlet, and a part of the air passage groove is formed along the outer periphery of the wheel mounting portion on the lower surface of the main body case. An electric vacuum cleaner characterized by.