JP2001212035A - Circulation type electric vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation type electric vacuum cleaner which prevents its body from excess heat rising and can improve dust inhaling capacity according to need. SOLUTION: This is a perfect circulation type electric vacuum cleaner first of all. An air release valve 71 is fixed in a returning air passage in which discharged air emitted from an electric air blower 22 built-in a cleaner body and sent back to an inhaling body passes. A controlling method which controls the air release valve 71 open/shut and the electric air blower power input. The controlling method 96 increases the electric air blower 22 power input at the same time as a vent 71 is opened, and decreases the electric air blower 22 power input at the same time as a vent 71 is closed. This control improves the electric air blower 22 inhaling capacity as well as opens the air release valve 71 and enables it to collect dust around the inhaling body as conventional non-circulating electric vacuum cleaner does and then it emits the discharged air to the atmosphere and promotes the electric air blow 22 radiation to control heat-up of rising the cleaner body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation of an electric blower, in which dust on a surface to be cleaned is sucked from a suction port, the dust is captured by a filter, and air discharged from the electric blower through the filter is removed. The present invention relates to a circulating vacuum cleaner that returns to a suction opening body, collects the returned air, and performs cleaning while circulating the returned air.

[0002]

2. Description of the Related Art In a circulation type vacuum cleaner, heated air is circulated by passing through an electric blower, so that the temperature of a synthetic resin vacuum cleaner body tends to rise. In particular, when a so-called complete circulation type vacuum cleaner that circulates all of the discharged air without directly discharging a part of the discharged air discharged from the electric blower from the cleaner body to the atmosphere is used. In this case, the temperature of the main body of the cleaner becomes easier to rise.

In order to prevent the temperature of the main body of the cleaner from rising above a predetermined temperature, the input to the electric blower is a non-circulation type vacuum cleaner which discharges the air directly from the main body to the atmosphere without circulating the air. It has been found by the inventor that it is necessary to set the input lower than that of the electric blower. For example, the input to the electric blower of the non-circulating vacuum cleaner is about 400 W to 500 W, whereas the input to the electric blower of the circulation vacuum cleaner needs to be as low as about 200 W.

However, due to such input restriction, dust suction at the suction opening of the circulating vacuum cleaner can suck in the dust facing the suction opening facing the surface to be cleaned of the opening. However, it is difficult to suck dust around the suction opening. Therefore, it is difficult to clean a corner such as a wall.

In the circulation type vacuum cleaner, an exhaust valve is provided which can discharge a part of the air circulating in the circulating air passage from the main body of the cleaner directly to the atmosphere. 2. Description of the Related Art A technique for adjusting a recirculation rate of air passing through a road is known. When a part of the circulating air is released into the atmosphere by adjusting the reflux rate, the suction port easily sucks outside air.

However, as described above, the circulation-type vacuum cleaner needs to suppress the input to the electric blower to a low level, and is not configured so that its set value fluctuates. Therefore, even if the recirculation rate is lowered, although the outside air is sucked in the suction port body, the influence of the suction is sufficiently applied to the circumference of the suction port body, and the dust around the suction port body is effectively reduced. Inhalation is still difficult, and improvement is required.

[0007] For the same reason, it is difficult to obtain the same suction performance as that of the non-circulation type vacuum cleaner even when the exhaust valve of the conventional circulation type vacuum cleaner is fully opened. Therefore, when cleaning using the gap nozzle for gap cleaning as the suction port body, the suction performance of dust in the part where the tip of the gap nozzle does not reach sufficiently, such as the depth of the gap or the depth of the groove of the aluminum sash, is low. There is a need for improvement.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circulating vacuum cleaner that can improve dust suction performance as needed while preventing the temperature of the vacuum cleaner body from rising excessively. is there.

[0009]

According to the present invention, the operation of an electric blower sucks dust on a surface to be cleaned from a suction opening, catches the dust with a filter, passes through the filter, and discharges the dust from the electric blower. It is assumed that a circulating vacuum cleaner is used, which returns air to the suction port body and collects and returns the returned air for cleaning while circulating.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a synthetic resin cleaner body having a dust collecting chamber in which the filter is accommodated, and a cleaner main body located downstream of the dust collecting chamber. An electric blower built in the cleaner body, an exhaust valve provided in a return air passage through which exhaust air discharged from the electric blower and returned to the suction opening body passes, and a valve for opening and closing the exhaust valve An operation unit having an input unit, and when the input unit is operated to open the exhaust valve,
Open the exhaust valve and increase the input of the electric blower, and when the input unit is operated to close the exhaust valve, close the exhaust valve and reduce the input of the electric blower. And control means for performing control to perform the control.

In the present invention and each of the following inventions, the exhaust valve can be provided in the cleaner main body side, in the suction port body, or in a return air passage formed over a communication pipe for communicating the same. However, in particular, providing the cleaner body has the advantage that the discharge air discharged from the electric blower can be easily discharged into the atmosphere in a state where the airflow resistance is small and the exhaust performance is good, and the vacuum cleaner body is also provided. Since the exhaust valve can be installed by using the dead space inside, the valve installation space is not particularly required, and the valve installation portion is not increased in size. In this invention and each of the following inventions, the operating section can be provided on the cleaner body side, on the suction opening body, or on a communication pipe for communicating the same, but especially on the tip of the dust suction hose. The connection tube for the hand operation described above is excellent in that convenience in operation can be obtained, and a push button or the like which is easy to operate can be used for the valve input unit. Further, the present invention and the following inventions can be applied to various types of circulating vacuum cleaners such as a canister type, an upright type, and a handy type.

According to the first aspect of the present invention, the control means keeps the input to the electric blower low by keeping the state in which the exhaust valve is closed by the valve input section of the operation section. This circulation-type vacuum cleaner performs cleaning while reducing the power consumption and returning the air that has passed through the filter and the electric blower to the suction opening body and circulating it.

[0013] When a stronger suction is required than in a normal circulating cleaning state, such as when cleaning a corner such as a wall, the valve input section of the operation section must be operated only at that time. I just need. By this operation, the control means controls to open the exhaust valve and increase the input to the electric blower, so that the circulating air is discharged to the outside of the circulating air passage and the blower wind of the electric blower increases. Therefore, the suction force (suction air volume and suction speed) at the suction port body is increased, so that dust around the suction port body as well as the portion where the suction opening of the suction port body faces can be sucked. That is, a use form similar to that of the non-circulation type vacuum cleaner can be obtained.

In this operation, the heat generated by the electric blower increases due to the increase in the input. Nevertheless, much of the exhaust air that passes through the electric blower and becomes hot and is discharged from the electric blower is discharged out of the circulation air passage through an open exhaust valve and eventually released to the atmosphere. Is not circulated. Such exhaust to the atmosphere, that is, heat can be dissipated, and since the outside air is sucked in from the suction port body, the temperature itself of the air sucked into the electric blower also decreases, thereby reducing the temperature of the synthetic resin cleaner body. Can be prevented from rising too much.

In order to solve the same problem, a second aspect of the present invention is a synthetic resin made of synthetic resin having a dust collecting chamber for accommodating the filter and having an exhaust port at a downstream portion of the dust collecting chamber. A main body of the cleaner, an electric blower located in the main body of the cleaner located downstream of the dust collecting chamber, and a return air passage through which exhaust air discharged from the electric blower and returned to the suction opening body passes. An exhaust valve provided therein, a code reel device incorporated in the cleaner body located in an outflow path of exhaust air from the exhaust valve to the exhaust port, and a valve for opening and closing the exhaust valve An operation unit having an input unit, and when the valve input unit is operated to open the exhaust valve, opens the exhaust valve and increases the input of the electric blower, and The input unit is operated to close the exhaust valve. When it is, it is characterized by comprising a control means for performing control with to close the exhaust valve to reduce the input of the electric blower.

According to the second aspect of the present invention, the cord reel device is provided with a spiral spring for automatic winding, or without the spring, the handle is manually turned to wind the reel onto the code reel. It may be done. In the second aspect of the present invention, the exhaust port of the cleaner body may serve as the cord port through which the power cord passes as in the third embodiment, but may be provided in the cleaner body separately from the cord port.

In the second aspect of the present invention, the first aspect is also provided.
The same effect as that of the invention can be obtained. That is, by keeping the state in which the exhaust valve is closed by the valve input section of the operation section, the control means keeps the input to the electric blower low. Cleaning is performed while suppressing the electric power and returning the air that has passed through the filter and the electric blower to the suction port and circulating the air.

[0018] When a stronger suction than in a normal circulation type cleaning state is required, for example, when cleaning a corner such as a wall, the valve input section of the operation section must be operated only at that time. I just need. By this operation, the control means performs control to open the exhaust valve and increase the input to the electric blower, so that the circulating air is exhausted out of the circulation air passage and the blower wind of the electric blower increases. Therefore, the suction force (suction air volume and suction speed) at the suction port body is increased, so that dust around the suction port body as well as the portion where the suction opening of the suction port body faces can be sucked. That is, a use form similar to that of the non-circulation type vacuum cleaner can be obtained.

During this operation, the heat generated by the electric blower increases due to the increase in the input. Nevertheless, much of the discharged air that has passed through the electric blower and is heated and discharged from the electric blower passes through the open exhaust valve and is discharged to the downstream side of the dust collection chamber of the cleaner body. From there, it flows to the exhaust port of the cleaner body, and is discharged into the atmosphere through this exhaust port, and is not circulated. In addition to such exhaust to the atmosphere, that is, in addition to heat radiation, the temperature of the air sucked into the electric blower itself drops because the outside air is sucked from the suction port body, so that the temperature of the synthetic resin cleaner body becomes lower. Can be prevented from rising too much.

Further, the invention of claim 2 is superior to the invention of claim 1 in the following points. That is, since the cord reel device is disposed in the outflow path of the exhaust air from the exhaust valve to the exhaust port, the exhaust is discharged to the downstream side of the dust collecting chamber of the cleaner body through the exhaust valve as described above. After that, the cord reel device can be exposed to the air flowing toward the exhaust port of the cleaner body. Therefore, despite the increased input to the electric blower, despite the increased heat generation of the power cord of the cord reel device for supplying power to the blower,
The cord can be cooled by outflow air flowing toward the exhaust port.

According to a third aspect of the present invention, the exhaust port and the exhaust valve are provided in such a positional relationship as to substantially sandwich the cord reel device from the radial direction.

In the present invention, the outflow air flowing toward the exhaust port of the cleaner body through the exhaust valve is caused to flow along the entire circumference of the cord reel device, and the power cord of the cord reel device is changed. It can be cooled efficiently.

According to a fourth aspect of the present invention, a cord port through which a power cord of the cord reel device passes also serves as the exhaust port.

In the present invention, the use of the cord port as the exhaust port is advantageous in that it is not necessary to form a special exhaust port in the cleaner body.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

1 to 3, reference numeral 1 denotes a pair of wheels 2.
And a cleaner body that can be freely moved on the surface to be cleaned by a turning wheel (not shown). The cleaner body 1 has a dust suction port 3 provided at a front portion thereof and one end of a dust suction communication pipe 6 having a flexible dust suction hose 4 and an inflexible dust suction pipe 5, that is, a dust suction hose 4. The suction pipe 8 is connected to the other end of the communication pipe 6, that is, the dust suction pipe 5. Although not shown, air exhausted from an electric blower, which will be described later,
The air is guided so as not to be mixed with the dust-absorbing air.

At the front of the cleaner body 1 formed by combining a plurality of synthetic resin case members, there is formed a dust collecting chamber 11 having an upper opening, and a downstream side of the dust collecting chamber 11. At the rear of the cleaner body 1 located at
Are formed. A dust collection bag 13 (see FIG. 1) as a filter is housed in the dust collection chamber 11 so as to be able to be taken in and out, and a rear filter unit 14 (see FIG. 3) for supporting a rear surface portion of the bag 13 has a blower room. It is arranged close to the 12 side. As shown in FIG. 1, the upper opening of the dust collection chamber 11 is airtightly closed by a case cover 15 which can be opened and closed. The dust bag 13 can be arbitrarily attached and detached through the upper surface of the dust chamber 11, and the unit 14 can be removed as needed. 2 and 3, reference numeral 13a denotes a cardboard mouth frame of the dust collecting bag 13. Although not shown, the mouth frame 13a actually passes through an opening communicating with the dust suction port 3 through the center.

As shown in FIG. 3, a rubber packing 16 is fitted to and attached to the dust suction port 3 formed on the front wall of the dust collection chamber 11. And a seal portion protruding toward the dust collection chamber 11 side.

The mouth frame 13a comes into contact with the seal portion so as to achieve a sealing property therebetween. In FIG. 3, reference numeral 10 denotes a downwardly mounted shaft integrally projecting from the bottom wall of the cleaner body 1, to which the above-mentioned turning wheel (not shown) is mounted.

A blower unit 21 is built in the blower room 12 in which the wheels 2 are rotatably mounted on the outer surfaces of both sides. The unit 21 includes an electric blower 22, an electric blower cover 23, and a cord reel device 24, as shown in FIGS.

The electric blower 22 includes a motor section 22a and a fan section 22b including a centrifugal fan (not shown) driven by the motor section 22a and a fan cover for covering the centrifugal fan. The electric blower 22 is provided, for example, in a horizontal position with the fan unit 22b facing the dust collection chamber 11. An intake port 25 (see FIG. 4) is opened at one end face of the electric blower 22, that is, at the center of the fan cover.
A plurality of air discharge portions 26 are provided at intervals in the circumferential direction on the end peripheral surface on the side opposite to the fan portion 22b in FIG.
Reference numeral 27 in FIGS. 3 and 5 denotes a short cylindrical supported projection projected from the center of the end wall of the motor portion 22a.

As shown in FIGS. 3 to 5, the electric blower cover 23 made of synthetic resin is provided on the first case body 3 disposed on the front side.
1 and the second case body 32 disposed on the rear side are formed by connecting at a plurality of places by screwing (not shown). The first case body 31 includes an inner cylindrical portion 31a as long as the entire length of the electric blower 22, an outer cylindrical portion 31b shorter than the cylindrical portion 31a, and both cylindrical portions 31a, 31b.
And an end wall 31c integrally connected. Inner cylindrical part 3
The opening on the side of the end wall 31c of 1a is used as an inlet 30 for exposing a portion of the air inlet 25 of the electric blower 22.

The opening edge of the outer cylindrical portion 31b opposite to the end wall 31c has an annular fitting groove which fits on the opening edge of the second case body 32, and It is connected to. A dish-shaped bracket portion 31d is provided integrally with a plurality of inwardly extending bridge portions 31e (only one is shown in FIG. 4) on the opposite side of the inlet 30 of the inner cylindrical portion 31a. A ventilation portion 31f (only one is shown in FIG. 4) is formed between the portions 31e.

The first case body 31 includes an electric blower 22
Is housed. That is, the support rubber 33 is fitted on the supported convex portion 27 of the electric blower 22, and the annular support rubber 35 that exposes the intake port 25 is also fitted on the fan portion 22 b. The support rubber 35 is covered over the peripheral portion and the peripheral surface of the end surface of the fan portion 22b. Then, the supported convex portion 27 covered by the support rubber 33 is fitted and supported in the bracket portion 31d, and the support rubber 35 is inserted into the inlet 30 of the inner cylindrical portion 31a to support the fan portion 22b. Electric blower 2
2 is mounted in the first case body 31 in a vibration-proof manner.
In this built-in state, the outer peripheral portion of the support rubber 35 that does not block the intake port 25 overlaps with the inner peripheral portion of the end wall 31c.

The second case body 32 includes the inner cylindrical portion 31
The end wall 32b is integrally provided at one end of a stepped cylindrical portion 32a which covers a from the outer peripheral side, and a reel support shaft 34 protruding outward is formed integrally on an outer surface of a central portion of the end wall 32b. Have been.

As shown in FIGS. 3 and 4, the code reel device 24 includes a code reel 41 provided with upright annular flanges at both ends of a winding drum. Base wall 4 integrally provided inside
And 2. The recess 4 for accommodating the second case body 32 by the cord reel 41 and the base wall 42.
3 are formed. In the winding groove of the cord reel 41, an insertion plug 44a is inserted into the end drawn out of the cleaner body 1.
The power cord 44 (shown in FIG. 1) (see FIG. 2).
Is to be wound. A disk 45 is attached to the base wall 42 in close proximity to the end wall 32b, and a spiral spring 46 for rewinding (see FIG. 4) is arranged between the disk 45 and the base wall 42.

Each of the base wall 42 and the disk 45 is rotatably supported by the reel support shaft 34, and
One end of the cord reel device 24 is supported by the electric blower cover 23 in a state where the rear portion of the electric blower cover 23, that is, the second case body 32 is accommodated in the recess 43. In this attachment, the center end of the spiral spring 46 is connected to the reel support shaft 34, and the outer end is connected to the base wall 42 and the like.

A slip ring mechanism (not shown) electrically connected to the power cord 44 is formed between the disk 45 and the end wall 32b.
2 is supplied. In addition, FIG.
In FIG. 5, reference numeral 47 denotes a stopper which is non-rotatably connected to the tip of the support shaft 34, and which prevents the cord reel device 24 from coming off the reel support shaft 34.

A gap is provided between the cylindrical portion 32a of the second case body 32 and the open end side of the code reel 41 covering the cylindrical portion 32a, that is, the code reel device 24.
The end opposite to the base wall 42 is rotatably supported via a plurality of rollers (not shown) attached to the outer periphery of the second case body 32. Therefore, the cord reel device 24 is arranged in series with the electric blower 22 while sharing the same axis. In FIG. 5, reference numeral 1 b denotes partition ribs provided on the inner surface of the cleaner main body 1 so as to individually oppose the peripheral surfaces of both flanges of the code reel 41, and between these ribs 1 b and the flange of the code reel 41. Are each formed with an annular gap g.

The blower unit 21 having the above-described structure is inserted into the blower chamber 12 through various ribs provided in the cleaner body 1 (only three kinds of ribs are indicated by reference numerals 55 to 58 in FIG. 3). The support is fixed. The rib 55 is engaged with the outer periphery of the first case body 31 to perform positioning and support, and the rib 58 is provided on the suction guide wall between the dust collection chamber 11 and the blower chamber 12 so as to be on the front surface of the support rubber 35. The ribs 57 are engaged with each other to perform positioning and support, and the ribs 57 support the above-mentioned stoppers 47 which are hooked on the grooves thereof to perform positioning. The ribs 56 are provided at intervals so as to allow the exhaust air discharged from the exhaust valve 71 described later to flow toward the gap g.

The power cord 44 is connected to the cord port 1a (FIG. 1).
And 6). The cord opening 1 a is provided between the two flanges of the cord reel 41 and is provided laterally in an upper portion at the rear of the cleaner body 1. This cord opening 1a is provided with a power cord 4
In a state in which the blower 4 is pulled out, the plug 4a is not blocked by the plug 44a, and is used as an exhaust port that allows the air in the blower chamber 12 to be released into the atmosphere. The cord opening 1a is provided facing one side in the width direction of the cleaner main body 1. In FIG. 6, reference numeral 51a denotes a cover portion of the cleaner main body 1 provided in an eaves shape with respect to the cord opening 1a; A cord opening protection member for receiving the insertion plug 44a. The cover part 51a is formed on a cover member 51 attached as a part of the main body 1 to the rear upper surface of the main body 1 of the cleaner.
The cord protection member 52 has a cord through-hole communicating with the cord opening 1a. The cord opening protection member 52 has a size that allows a finger to be inserted into the inside thereof to grasp the insertion plug 44a from both sides in the width direction and to pull out. That's it.

The electric blower cover 23 has an outlet 61 for taking out the air inside. As shown in FIG. 2, the outlet 61 is provided at a position corresponding to the outer periphery of the fan portion 22b, that is, at a part of the outer cylindrical portion 31b of the first case body 31 so as to protrude outward. One end of a return air path member 62 is connected to the outlet 61. The return air passage member 62 is arranged so as to bypass one side of the dust collection chamber 11, and the other end is connected to the dust suction port 3.

The electric blower cover 23 which forms a part of a return air path for returning the exhaust air discharged from the electric blower 22 to the suction opening 8 penetrates the wall of the cover 23 and is shown in FIGS. The illustrated exhaust valve 71 is attached. The exhaust valve 71 includes a valve section 71a and a driving section 71b that opens and closes the valve section 71a.

The valve portion 71a has a valve housing 72 formed by combining a first housing and a second housing. The valve housing 72 is driven by a driving unit holder 73 by fastening a plurality of screws 74 together. At the same time, it is attached to the exhaust valve attachment portion of the electric blower cover 23. The valve housing 72 communicates with the inside of the electric blower cover 23a through an opening (not shown). The second of the valve housing 72
The housing has a valve hole 75. The valve housing 72 includes a valve hole 7.
A valve shaft 77 to which the valve body 76 for opening and closing the valve 5 is attached and movable in the axial direction and a spring 78 for constantly biasing the valve shaft 77 toward the second housing are incorporated. This spring 78
, The valve element 76 normally closes the valve hole 75.
As shown in FIG. 6, the drive unit holder 73 is provided with openings 73a, and the inside of the drive unit holder 73 and the inside of the blower chamber 12 are communicated through these openings 73a. Therefore, when the valve hole 75 is opened, the inside of the electric blower cover 23a and the inside of the blower chamber 12 are communicated.

The driving section 71b is formed by a valve motor 79 mounted on the outer surface of the driving section holder 73 and a cam 80 fixed to a motor shaft 79a inserted into the driving section holder 73 of the motor 79. ing. The valve motor 79 comprises a stepping motor, and the cam 80
The valve shaft 77 is moved toward and away from the valve shaft 77 inserted into the drive unit holder 73 through the valve shaft 5 to move the valve shaft 77 in the axial direction.

The exhaust valve 71 having the above structure is connected to the cord port 1a.
It is arranged on the front side (dust collection chamber 11 side). Moreover, when the cleaner main body 1 is viewed from the rear, as shown in FIG. 6, the exhaust valve 71 is disposed on the lower right side of the cleaner main body 1, and the cord port 1a is disposed on the upper left side of the cleaner main body 1. ing.
With such an arrangement, the cord port 1a and the exhaust valve 71 are provided in a positional relationship such that the cord reel 41 of the cord reel device 24 is substantially sandwiched from the radial direction.

The dust-absorbing hose 4 is, for example, a double tube having a coaxial structure. The dust-absorbing air sucked by the suction port 8 is passed through an air passage formed in the inner space of the bellows-like inner tube. The exhaust gas guided from the return air passage member 62 is passed through an annular air passage formed between the inner tube and the bellows-shaped outer tube. A connection cylinder 64 having a handle 63 which is formed in a rectangular shape and protrudes upward is provided at the tip of the dust suction hose 4.

The handle 63 is provided with an operation section 60 having a plurality of control switches (see FIG. 1) 63a to 63b. The control switch 63a is used for instructing the start and stop of the operation of the electric blower 22, the control switch 63b is used for opening and closing the exhaust valve 71, and the control switch 63c is used for starting and operating the cleaning body motor described later. Used to indicate a stop. Therefore, the control switch 63b is provided as a valve input unit. Each of the control switches 63a to 63c is a push button switch that repeats on / off each time the pressing is repeated.

As shown in FIG. 1, the dust suction pipe 5 detachably connected to the connection tube 64 is composed of a first pipe 5a and a second pipe 5b which are detachable from each other. These pipes 5
a and 5b each include an inner tube and an outer tube having a coaxial structure made of a synthetic resin hard tube, and a ventilation path inside the inner tube is communicated with the inner tube of the dust suction hose 4, An annular ventilation path (return air path) between both pipes is communicated with an annular path (return air path) of the dust suction hose 4.

The suction port 8 detachably connected to the tip of the dust suction pipe 5 has a connection pipe 65 for connecting to the dust suction pipe 5, and a suction opening ( (Not shown). The suction opening 8 has a built-in rotary cleaning body 66 that faces the suction opening and partially protrudes from the suction opening, and a cleaning body motor 67 that drives the cleaning body 66 to rotate. I have. Power is supplied to the cleaning body motor 67 via an electric wire (not shown) provided on the dust suction pipe 5 along the axial direction thereof.

The inside of the suction opening 8 has a return air passage which guides and returns the exhaust air from the electric blower 22 introduced into the inside to the suction opening, and this air passage is partitioned from the suction opening. A collection air path is formed for sucking dust on the surface to be cleaned and for sucking and collecting the exhaust gas returned to the suction opening. The return air passage communicates with the annular air passage of the dust suction pipe 5, and the recovery air passage communicates with the air passage inside the inner pipe of the dust suction pipe 5.

As shown in the electric circuit of FIG. 8, the first switching means 91 and the motor section 22 of the electric blower 22 are provided.
The electric motor 92a and a triac 93 having a gate electrode and a semiconductor current control element as an input adjusting means for the electric motor 92 are connected in series, and this series circuit is connected to a commercial AC power supply 94. A control means 96 composed of a microcomputer or the like is connected to a control power supply circuit 95 for generating a control power supply from a commercial AC power supply 94. By this means 96, the first switching means 9
1 is opened and closed, and the conduction angle of the triac 93 is controlled so that the magnitude of the input applied to the electric motor 92 is controlled. A driving power supply circuit 97 for generating a driving power supply from a commercial AC power supply 94 includes a first driving circuit for supplying power to the cleaning body motor 67 via a second switching means 98 and a third switching means 99. A second drive circuit for supplying power to the valve motor 79 is connected in parallel. Second and third switching means 98, 9
9 are opened and closed by control means 96, respectively.

The input terminals of the control means 96 are connected to the control switches 63a to 63c. When the control switch 63a is turned on, the control means 96
The first switching means 91 is turned off to supply electric power to the electric motor 92 of the electric blower 22. In this case, in a normal operation, the input to the electric motor 92 is set to about 200 W so as to be suitable for the complete circulation type cleaning. The conduction angle of the triac 93 is controlled so as to limit the angle to a low level. When the control switch 63c is turned on under the normal operation, the control means 96 turns on the second switching means 98 to energize the cleaning body motor 67.

In any of the above states, when the control switch 63b is turned on, the control means 96 is turned on.
Turns on the third switching means 98 and turns on the valve motor 79.
, The exhaust valve 71 is opened, and at the same time, the input of the electric blower 22 to the
The conduction angle of the triac 93 is controlled so as to be as large as 0 W to 500 W. Of course, from this state, the control switch 6
By turning off 3b, the control means 96 causes the exhaust valve 71 to close by, for example, reversing the valve motor 79, and at the same time, reduces the conduction angle of the triac 93 so that the input to the electric motor 92 drops to about 200W. Control.

The air circulation type vacuum cleaner having the above-described configuration is used by pressing the control switch 63a while the power cord 44 is pulled out and connected to an outlet. As a result, the electric motor 92 of the electric blower 22 is energized,
Since the electric blower 22 is driven, the electric blower 22
, The dust collecting chamber 11 becomes negative pressure. As a result, the air in the suction opening portion of the suction opening body 8 passes through the inner pipe of the communication pipe 6 as shown by the dotted arrow in FIG.
The dust is sucked into the dust collection bag 13 in the inside 1, and the dust contained in the suction airflow is removed by the dust collection bag 13.

The air sucked as described above is
After passing through the fan section 22b of the electric blower 22 disposed downstream of the dust collection chamber 11, the motor section 22a
Is discharged into the electric blower cover 23 from the air discharge portion 26 of the air blower. The air discharged into the electric blower cover 23 bypasses the inner cylindrical portion 31a of the first case body 31 of the electric blower cover 23 as shown by an arrow in FIG. After flowing inside the body 31, in other words, after flowing around the electric blower 22 from the rear side to the front side in the opposite direction to the flow direction of the suction airflow, it is discharged out of the electric blower cover 23 through the outlet 61. .

Further, the exhaust air thus led out of the cover 23 passes through the dust suction port 3 from the return air passage member 62,
It is returned to the suction opening of the suction opening 8 through the annular ventilation path of the communication pipe 6. The flow of the exhaust is shown by solid arrows in FIG. Then, the returned exhaust gas is again sucked into the dust collecting chamber 11 along the path shown by the dotted arrow in FIG. 1 and circulated. Further, in such an air circulation, by operating the cleaning body motor 67 as necessary by operating the control switch 63c to rotate the rotating cleaning body 66, dust existing between the hairs of the carpet can be sucked out while being scraped out. it can.

As described above, the exhaust air from the electric blower 22 is returned from the cleaner body 1 to the suction opening 8 without being directly discharged into the atmosphere, and is completely circulated while being sucked. The dust coming from the suction opening is carried and removed by the dust collection bag 13 in the intake air passage, so that the air circulation cleaning can be performed. According to such cleaning,
The driving sound of the electric blower 22 is suppressed from leaking to the outside, so that the cleaning can be performed quietly, and at the same time, while the surface to be cleaned is prevented from sticking to the suction opening, the suction opening 8 is moved slightly with respect to the surface to be cleaned. Can be cleaned.

Further, the periphery of the electric blower 22 is surrounded by the electric blower cover 23, and the periphery of the second case body 32 of the cover 23 is also surrounded by the cord reel device 24. In other words, the periphery of the electric blower 22 is surrounded by a plurality of walls separated from each other. In this case, the inner and outer cylindrical portions 35, 3 of the first case body 31 are
6, and the motor portion 22a side is covered with a triple wall of the second peripheral wall portion 35b of the inner cylindrical portion 35, the cylindrical portion 32a of the second case body 32, and the code reel 41. I have. Therefore, the propagation of the operating sound generated by the electric blower 22 during cleaning to the surroundings can be attenuated by the multiple walls. Moreover, since the exhaust and exhaust of the electric blower 22 do not pass through the electric blower cover 23 and the cord reel device 24 used as the sound reducing material, the electric blower 22
Does not increase, and therefore, a decrease in suction performance can be suppressed.

In the above-mentioned circulating cleaning, when a corner such as a wall of a room is to be cleaned, the control switch 63b may be pressed. Then, the control means 96 drives the valve motor 79 and increases the conduction angle of the triac 93, so that the valve shaft 77 of the exhaust valve 71 is pressed and moved by the cam 80 against the urging force of the spring 78, and this exhaust is performed. Valve 7
As soon as 1 is opened, the input to the electric blower 22 is increased from 200 W during normal operation to 400 W to 500 W.

As a result, the amount of air blown by the electric blower 22 increases, and as a result, the circulating air flows from the electric blower cover 23 which forms a part of the return air passage close to the electric blower 22 as described above. It is discharged outside, that is, into the blower room 12 of the cleaner body 1 through the exhaust valve 71. An arrow in FIG. 6 indicates an airflow passing through the exhaust valve 71. In this case, since the resistance of the return air passage from the electric blower cover 23 to the suction opening body 9 is large, much of the outflow air discharged from the electric blower 22 is discharged to the blower chamber 12 and has a higher resistance than the return air passage. The air is discharged from the cord opening 1a into the atmosphere outside the cleaner main body 1 through an outflow air passage described below. It should be noted that a part of the air is circulated irrespective of the exhaust to such release to the atmosphere.

As the amount and speed of the exhaust air circulating in the suction opening 8 are increased, the suction force of the suction opening 8 is increased, so that not only the portion where the suction opening of the suction opening 8 is opposed but also not The dust around the suction opening body can also be sucked. That is, in this use state, a use form similar to that of a normal non-circulation type vacuum cleaner can be obtained. Therefore, it is possible to perform cleaning by sucking dust at corners of the wall or the like while performing the air circulation type cleaning.

For the same reason, instead of the suction port 8 shown in FIG. 1, a suction port (not shown) composed of a clearance nozzle is attached to the end of the communication pipe 6, and a groove such as a wall or an aluminum sash is provided. Can also be cleaned with a strong suction force. As described above, cleaning as a complete circulation type vacuum cleaner and cleaning similar to a normal non-circulation type vacuum cleaner can be selectively used depending on a cleaning place by turning on / off the control switch 63b. Easy to use.

By the way, under the use condition in which the input to the electric blower 22 is increased as described above, the increase in the input increases the heat generation of the electric blower 22 and the power cord 44 of the cord reel device 24. However, the temperature of the cleaner body 1 does not become higher than the predetermined temperature.

That is, the exhaust air discharged into the blower chamber 12 from the exhaust valve 71 opened as described above is collected by the rib 1b in the cleaner body 1 and the cord reel 41b whose tip is opposed to the rib 1b. After flowing between the two flanges of the cord reel 41b through a gap g formed between the flange on the dust chamber 11 side, the cord port provided in the cleaner body 1 communicates between the flanges. It is released to the atmosphere through 1a.

By releasing much of the discharged air immediately after being heated through the electric blower 22 into the atmosphere in this way, the heat generated by the electric blower 22 can be effectively released into the atmosphere. In addition, since cold outside air can be sucked from the suction port body 8 as described above, the temperature itself of the air sucked into the electric blower can be reduced. Therefore, the synthetic resin vacuum cleaner main body 1 is irrespective of the increase in input as described above.
Temperature can be prevented from rising too high.

As described above, the outflow air flowing toward the cord port 1a discharged from the exhaust valve 71 flows between the two flanges of the cord reel 41 around which the power cord 44 is wound in the outflow air passage. Since the power cord 44 is distributed, it is possible to cool the power cord 44 which generates a large amount of heat as the input increases due to the distribution. Moreover, since the exhaust valve 71 and the lead port 1a located at the beginning and end of the outflow air passage are provided in such a positional relationship as to substantially sandwich the cord reel device 24 from the radial direction, the exhaust valve 71 is provided.
The outflow air flowing toward the lead port 1a through the cord reel device 24 flows along the entire circumference of the cord reel device 24, and therefore, the power cord 44 of the device 24 can be efficiently cooled. Therefore, the power input 4
Despite the increase in the heat generation of 4, the temperature of the cleaner body 1 does not rise above the predetermined temperature.

Further, since air is exhausted from the cord port 1a through which the power cord 44 passes, the cord port 1a can be used as an exhaust port. Therefore, it is not necessary to form a special exhaust port in the cleaner body 1.

[0069]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, when the valve input of the operation section is operated, the blower power of the electric blower is increased as compared with a normal use state in which the circulation cleaning is performed. Although the performance of sucking dust in the body can be improved and the heat generated by the electric blower increases with this, much of the hot exhaust air passing through this blower is discharged through the exhaust valve, resulting in The temperature of the cleaner main body can be prevented from rising too much due to the heat release and the outside air suction from the suction opening body caused by being released into the atmosphere.

According to the second aspect of the present invention, when the valve input of the operating section is operated, the blower power of the electric blower is increased as compared with a normal use state in which the circulation cleaning is performed. Although the performance of sucking dust in the body can be improved and the heat generated by the electric blower increases with this, much of the hot exhaust air passing through this blower is discharged through the exhaust valve, resulting in It is possible to prevent the temperature of the synthetic resin cleaner body from rising too high due to the radiation of heat and the release of outside air from the suction port due to the release into the atmosphere. In addition, the power cord, which generates heat as the input power increases, can be cooled by exposing the cord reel device to air flowing toward the exhaust port of the cleaner main body through the exhaust valve. Can be prevented from rising too much.

According to the third aspect of the present invention, the power cord of the cord reel device is efficiently cooled by the air which flows along the entire circumference of the cord reel device after being discharged from the exhaust valve and flows toward the exhaust port. Thus, it is possible to prevent the temperature of the vacuum cleaner body from rising too high.

According to the fourth aspect of the present invention, since the cord port is used as an exhaust port, it is not necessary to form a special exhaust port in the cleaner body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of the cleaner main body of the electric vacuum cleaner shown in FIG. 1 together with built-in components.

FIG. 3 is a perspective view showing a vacuum cleaner main body of the electric vacuum cleaner shown in FIG.

FIG. 4 is an exemplary perspective view showing a cross section of a blower unit included in the electric vacuum cleaner shown in FIG. 1;

FIG. 5 is a vertical sectional side view showing a rear portion of the electric vacuum cleaner shown in FIG. 1;

FIG. 6 is a sectional view taken along the line ZZ in FIG. 5;

FIG. 7 is an exemplary perspective view showing a cross section of an exhaust valve provided in the vacuum cleaner shown in FIG.

FIG. 8 is a block diagram showing a circuit configuration of the vacuum cleaner shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner main body 1a ... Cord port (exhaust port) 8 ... Suction port body 11 ... Dust collection room 12 ... Blower room 13 ... Dust collection bag (filter) 21 ... Blower unit 22 ... Electric blower 22a ... Motor part 22b ... Fan Unit 24 Code reel device 41 Code reel 44 Power cord 60 Operation unit 63b Control switch (valve input unit) 71 Exhaust valve 92 Electric motor of electric blower 93 Triac (input adjustment means) 96 Control means

Claims (4)

[Claims] 1. The operation of an electric blower sucks dust on a surface to be cleaned from a suction opening body, captures the dust with a filter, and passes air discharged from the electric blower through the filter to the suction opening body. In a circulating vacuum cleaner for cleaning while collecting and circulating the returned air, a synthetic resin cleaner body having a dust collecting chamber in which the filter is housed, and a downstream of the dust collecting chamber An electric blower which is located on the side and is built in the cleaner body; an exhaust valve provided in a return air passage through which exhaust air discharged from the electric blower and returned to the suction port body passes; An operation unit having a valve input unit for opening and closing the valve, and when the valve input unit is operated to open the exhaust valve, open the exhaust valve and increase the input of the electric blower, And before When the valve input unit is operated to close the exhaust valve, control means for closing the exhaust valve and performing control to reduce the input of the electric blower is provided. Type vacuum cleaner. 2. The operation of the electric blower sucks dust on the surface to be cleaned from the suction port body, catches the dust with a filter, and passes air discharged from the electric blower through the filter to the suction port body. A circulation type vacuum cleaner for returning and cleaning while collecting and circulating the returned air. The circulation type vacuum cleaner has a dust collection chamber in which the filter is housed and an exhaust port in a downstream portion of the dust collection chamber. A synthetic resin-made vacuum cleaner main body, an electric blower located in the vacuum cleaner main body located downstream of the dust collection chamber, and exhaust air discharged from the electric blower and returned to the suction port body passes therethrough. An exhaust valve provided in a return air passage; a code reel device incorporated in the cleaner body positioned in an outflow air passage of exhaust air from the exhaust valve to the exhaust port; opening and closing the exhaust valve For valve An operation unit having a force unit, when the valve input unit is operated to open the exhaust valve, opens the exhaust valve and increases the input of the electric blower, and When the input unit is operated to close the exhaust valve, control means for closing the exhaust valve and controlling the input of the electric blower to be small, comprising: Vacuum cleaner. 3. The circulation type electric cleaning according to claim 2, wherein the exhaust port and the exhaust valve are provided in such a positional relationship that the exhaust port and the exhaust valve substantially sandwich the cord reel device from the radial direction. Machine. 4. The circulation type vacuum cleaner according to claim 2, wherein a cord port through which a power cord of the cord reel device passes also serves as the exhaust port.