JPH11253365A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue cleaning while suppressing the temperature rise of a motor-driven blower. SOLUTION: By the drive of the motor-driven blower 13, dust is sucked from the suction port 51 of a suction port body part 3 together with air and captured through a suction air path into the dust collecting chamber 12 of a main body part 2. Filtered air is discharged from the discharge opening 27 of the motor-driven blower 13 into a motor-driven blower chamber 14 as ejection air. The ejection air is partially discharged from the discharge port of a discharge chamber and blown through an ejection air path 101 to a floor surface and the dust is blown up and sucked from the suction port 51 again. When the temperature of the motor-driven blower 13 is elevated by dust clogging, the temperature rise of the motor-driven blower 13 is detected by a first temperature sensor 38a. The temperature rise of the ejection air is detected by a second temperature sensor by the closing of the discharge port. The input of the motor- driven blower 13 is reduced and the damage to the motor-driven blower 13 is prevented by cooling by natural cold radiation in a state capable of cleaning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling an input of an electric blower according to a state of a discharge wind discharged from the electric blower.

[0002]

2. Description of the Related Art As a conventional vacuum cleaner, for example, a drive of an electric blower sucks dust together with air from a suction port, captures the dust in a dust collection chamber, and discharges filtered air from an exhaust port. Suction-type configurations are known. In this vacuum cleaner, a temperature sensor is disposed in the vicinity of the electric blower, and the temperature is increased due to an increase in the amount of captured dust, a blockage of the suction port by dust sucked in, and a blockage of the exhaust port. A configuration is adopted in which a sensor detects an increase in the temperature of the electric blower, stops driving the electric blower, and prevents damage to the electric blower.

On the other hand, as described in JP-A-52-124282 and JP-A-4-193239, filtered air is blown out to a surface to be cleaned as discharge air to blow up dust and suck it in again through a suction port. A so-called reflux-type vacuum cleaner is known.

[0004] That is, the electric vacuum cleaner described in Japanese Patent Application Laid-Open No. 52-124282 communicates with a vacuum side of an electric blower through a suction air passage, opens a suction port for sucking dust from a floor surface, and has an electric blower. An outlet is formed in the vicinity of the inlet through the outlet air path, and dust on the floor is blown up by the outlet air blown out from the outlet to suck in the air from the inlet. Also, an exhaust port which is appropriately opened and closed by a valve body in the discharge air path to exhaust a part of the discharge air is formed, and a part of the discharge air is exhausted, and the outside air is sucked in from the suction port to thereby circulate the discharge air. The structure is adopted in which the temperature rise of the air blower is suppressed and damage to members constituting the electric blower and the air passage is prevented.

Further, the electric vacuum cleaner described in Japanese Patent Application Laid-Open No. 4-193239 has a suction port which communicates with a suction side of the electric blower through a suction air passage to suck dust from a floor surface and opens the electric blower. The discharged air is blown against a rotatable cleaning body that is rotatably provided facing the suction port through the discharge air path, and is rotated to scrape dust.The discharged wind blows the dust from the floor surface, and blows the dust from the suction port. I'm inhaling. In addition, a configuration is adopted in which an air cooling device is provided in the discharge air passage to cool the returned discharge air, thereby preventing damage to the electric blower and members constituting the air passage.

[0006]

However, in the configuration in which the driving of the electric blower whose temperature has risen by using the temperature sensor is stopped, for example, in the configuration in which the discharge air recirculates and the temperature rises, the frequency is often increased during cleaning. There is a problem that the driving of the electric blower stops and the cleaning work becomes complicated. Also,
JP-A-52-124282 and JP-A-4-19.
In the recirculation type vacuum cleaner described in Japanese Patent No. 3239, a structure for suppressing the temperature of the discharge air is separately required, and a part of the discharge air is exhausted from an exhaust port described in Japanese Patent Application Laid-Open No. 52-124282. In the configuration in which the air is exhausted to the outside air, if the exhaust port is closed, the rise in the temperature of the discharge air cannot be suppressed, and the temperature may rise and the electric blower may be damaged. There is a need.

As described above, in the conventional vacuum cleaner, a structure for separately suppressing the temperature rise is required. If the temperature rises, the electric blower is stopped and cannot be cleaned. In the configuration in which the temperature rises due to the reflux, the electric blower is frequently stopped, and there is a problem that the cleaning operation is complicated.

[0008] The present invention has been made in view of the above problems, and has as its object to provide an electric vacuum cleaner capable of continuing cleaning while suppressing a rise in temperature of the electric blower.

[0009]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner having a main body for accommodating an electric blower, a temperature detecting means for detecting a temperature of a discharge air discharged from the electric blower, Control means for sequentially reducing the input of the electric blower in proportion to a rise in temperature detected by the detection means.

The control means sequentially reduces the input of the electric blower in proportion to the rise in the temperature of the discharge air discharged from the electric blower detected by the temperature detecting means. Even if the temperature of the electric blower gradually increases, such as in the case of a recirculation type that sucks in the discharge wind again, the increase in the temperature of the electric blower is suppressed by reducing the input, and the temperature of the electric blower is increased. The cleaning can be continued while preventing the damage due to.

According to a second aspect of the present invention, in the vacuum cleaner of the first aspect, the temperature detecting means is provided in the electric blower.

Further, since the temperature detecting means is provided in the electric blower in which the temperature rise is remarkable at the heat generating source, the temperature increase of the electric blower is surely detected to prevent the electric blower from being damaged.

According to a third aspect of the present invention, there is provided an electric vacuum cleaner including a case body which accommodates an electric blower and has a dust collecting chamber provided on a negative pressure side of the electric blower, and a suction opening formed in a surface opposed to a surface to be cleaned. A suction air passage communicating the suction port with the suction side of the electric blower through the dust collecting chamber, and an end communicating with the positive pressure side of the electric blower and the other end communicating with the suction port. A discharge air path through which the discharge air discharged from the air flows, an exhaust port provided in the discharge air path to exhaust at least a part of the discharge air, and a flow state of the discharge air flowing through the exhaust port. An exhaust wind detecting means, and a control means for sequentially reducing the input of the electric blower in proportion to a decrease in the amount of the discharged air flowing through the exhaust port by the exhaust wind detecting means.

By driving the electric blower, dust is sucked in together with air from a suction opening formed on a surface opposite to the surface to be cleaned and is captured in a dust collection chamber, and the air is discharged by the electric blower as a discharge air passage. The exhaust air is discharged from the downstream side communicating with the suction port through the outlet and recirculated, and the noise caused by the exhaust air being exhausted as the exhaust air, the discomfort caused by the exhausted exhaust air being blown to the cleaner, and the exhaust air are generated. In addition to suppressing the deterioration of the environment caused by blowing off dust on the cleaning surface and the increase in negative pressure at the suction port, the suction port sticks to the surface to be cleaned and reduces workability. A part of the discharge air is exhausted as the exhaust air to suppress a rise in the temperature of the discharge air that returns. When the exhaust port is closed and the amount of exhaust air flowing through the exhaust port is reduced, the input of the electric blower is sequentially reduced by the control means in proportion to the decrease in the amount of air flowing through the exhaust port. Can be cleaned while suppressing the rise in wind temperature.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the vacuum cleaner of the present invention will be described below with reference to the drawings.

2 to 7, reference numeral 1 denotes a vacuum cleaner main body. The vacuum cleaner main body 1 is a so-called upright type, and is mounted on a main body 2 and a lower end portion which is a front part of the main body 2. And a handle portion 4 provided at an upper end portion which is a rear portion of the main body portion 2.

The main body 2 has a lower case 5 having an open upper surface, an upper case 6 for closing the upper surface of the lower end of the lower case 5, and an upper surface of the upper end of the lower case 5 which can be detached. Main body case 8 having lid case 7 to be closed
have. Further, on both side surfaces of the main body case 8, semicircular groove-shaped flange portions 9a and 9b that open toward the upper surface side are formed to protrude toward the side, respectively.

A lattice-shaped partition 11 that opens a plurality of communication ports (not shown) is provided in the main body case 8, and the upper end, which is the front side of the partition 11, is covered by a lid case 7. A dust chamber 12 is defined. Further, an electric blower room 14 for accommodating the electric blower 13 is formed at the rear lower end of the partition 11. A drum chamber 15 is provided on the upper end side of the dust collection chamber 12 and is substantially airtightly partitioned from the dust collection chamber 12, and a circuit chamber 16 is formed on one side of the dust collection chamber 12.
Further, the rear side of the electric blower room 14
Exhaust chamber that opens to communicate with the outside air through the exhaust port 17a
17 are sectioned. As will be described later, the exhaust port 17a has such a degree that the negative pressure on the lower surface of the suction port body 3 is increased and the suction port body 3 is strongly attached to the floor surface so that the traveling performance is not deteriorated. It is preferable to form the opening area for discharging the discharge air 28 to such an extent that the temperature rise due to the return of the air 28 can be suppressed.

On one side surface of the dust collecting chamber 12, a substantially cylindrical suction portion 18 which opens to the side is provided. The suction portion 18 opens toward the upper end of one flange 9a of the main body case 8. Furthermore, the dust collection chamber of the suction section 18
On the 12 side, a holder 20 to which the dust collection bag 19 is slidably mounted is provided. A first auxiliary filter 21a, which is a high-performance filter formed of, for example, a charged fiber, is detachably mounted on the dust collecting chamber 12 side of the partition wall 11. The dust bag 19 and the first auxiliary filter 21a are detachable from an opening on the upper surface of the lower case 5 closed by the lid case 7. Further, a second auxiliary filter 21b similar to the first auxiliary filter 21a is disposed in the exhaust chamber 17 so as to close the exhaust port 17a.

One end of a flexible suction hose 23 is connected to the suction portion 18, and the suction hose 23 is disposed so as to be placed on one flange 9 a of the main body case 8. .

On the other hand, a fixed rib 25 is protruded in the electric blower chamber 14, and the electric blower 13 covers the fan (not shown) of the electric blower 13 via a vibration absorbing material 26 such as rubber by the fixed rib 25. An intake port formed in the cover 13a is held in an airtight manner in communication with the dust collecting chamber 12.

In the electric blower chamber 14, an opening is formed in an electric motor 13b provided in the electric blower 13 for rotating a fan, and the electric blower chamber 14 is opened through an exhaust opening 27 communicating with an intake port.
The discharge air 28, which is air discharged into the air blower 14, is supplied to the electric blower room 14.
A discharge unit 29 for discharging to the outside is provided. This discharge unit 29
Is formed in an L-shape in a substantially cylindrical shape, one end of which is air-tightly communicated with the inside of the electric blower chamber 14 and the other end of which is opened toward the lower end side of the other flange 9b of the main body case 8 to form the flange 9b. It is arranged in.

Further, a flexible discharge hose 30 is connected to the distal end of the discharge portion 29 located at the flange 9b, and the discharge hose 30 is mounted on the flange 9b like the suction hose 23. It is arranged as follows.

In the drum chamber 15, a drum 33 for winding a power supply line 32 for supplying commercial AC power to the electric blower 13 is rotatably accommodated. Furthermore, in the drum chamber 15,
A winding operation button 34 for winding the power line 32 unwound from the drum 33 and being pulled out is provided on one side of the main body case 8 so as to be able to advance and retreat, and the drum 33 is operated by operating the winding operation button 34. Release the rotation regulation of the mainspring 35
A release means 36 for winding the power supply line 32 around the drum 33 is provided.

Further, a circuit board (not shown) for controlling the driving state of the electric blower 13 is provided in the circuit chamber 16, and a power supply line 32 wound around a drum 33 is electrically connected to the circuit board. ing. The electric blower 13 is mounted on the circuit board.
A first temperature sensor 38a as temperature detecting means for detecting the temperature of the electric blower 13 and a second temperature sensor 38b as exhaust air detecting means for detecting the temperature in the exhaust chamber 17; , The first temperature sensor 38
a and a second temperature sensor 38b detect a predetermined temperature,
Notifying means disposed on the upper end face of the main body 2 for notifying that the temperature has risen and the driving state of the electric blower 13 by a display or the like.
39 is connected. Note that the second temperature sensor 38b is
The discharge chamber 28 faces the exhaust port 17a, and is located on the upstream side of the flow where the discharge air 28 is exhausted as the exhaust air from the exhaust port 17a.
The electric blower room 14 is disposed on a wall surface which is partitioned. Further, the temperature Ta detected by the first temperature sensor 38a and the temperature Tb detected by the second temperature sensor 38b are set to be lower than the temperature Tb.

A handle portion 4 provided at an upper end portion which is a rear portion of the main body portion 2 is provided with a rotatable flange portion 40 at one end side. It is sandwiched between holding ribs 41, 41 protruding from the upper case 6, respectively, and is rotatably supported about the axial direction as a rotation axis. Further, a grip portion 42 is provided on the other end side of the handle portion 4, and the grip portion 42 is provided with an electric blower.
An operating means 44 having various buttons 43, 43 for setting the driving state of 13 is provided on a circuit board in the circuit room 16 by being electrically, magnetically, acoustically or optically connected. I have.

On the other hand, the suction port body part 3 attached to the lower end part which is the front part of the main body part 2 is
The upper case 47 has a nozzle case 48 that is long in the left-right direction and is attached with a bumper (not shown) sandwiched between the peripheral edges of the nozzle case 48 with its upper surface closed. The nozzle case 48 of the suction opening body 3 and the main body case 8 of the main body 2 form a case body.
49 are configured. In addition, a rib 50 is provided in the nozzle case 48.
A suction chamber 52 formed longitudinally in the left and right direction and opening a suction port 51 on the lower surface, and a suction air passage chamber 53 partitioned and formed in a trumpet shape at substantially the center of the suction chamber 52, A fan chamber 54 defined on one side of the suction air passage chamber 53, a duct chamber 55 defined on one side of the fan chamber 54, and a suction chamber 52
And a drive transmission chamber 56 formed on one side of the duct chamber 55.
And a discharge air passage chamber 57 defined substantially parallel to the suction chamber 52.
And a communication duct chamber 58 which is defined between the suction chamber 52 and the discharge air path chamber 57 in a substantially parallel manner.

In the nozzle case 48, a substantially cylindrical rotating tube 60 having one end located in the suction air passage chamber 53 and opening toward the suction chamber 52 is rotatable at the other end in the vertical direction. Is provided. A wall-shaped partition portion is formed in the rotating pipe 60 along the axial direction.
61 is provided, and a suction pipe section 62 and a discharge pipe section 63 are defined and formed. A rotating shaft 64 that is supported by the rib 50 of the nozzle case 48 protrudes from one end of the rotating tube 60, and the end of the discharge tube 63 is formed in an L-shape on the other side. Rotating shaft toward side
A rotating shaft portion 65 is provided coaxially with 64 and projects in a substantially cylindrical shape and communicates with the fan chamber 54 and is supported by the rib 50.
It is arranged rotatably by 64 and a rotating shaft 65.

Further, a connecting tube 67 is provided at the other end of the turning tube 60 on the turning side. This connection pipe part 67
Is a substantially cylindrical fitting portion 68 into which the rotating tube 60 is fitted, and a suction side portion provided at one end of the fitting portion 68 in a bifurcated manner.
It has a 69 and a discharge side 70 and is formed in a substantially Y-shape.
The connection pipe 67 has a suction side 69 and a discharge side 70.
Between the main body 2 and the main body 2.
A mounting tongue piece 71 is attached to the lower end of the main body 2 with a screw or the like, and integrally connects the suction opening body 3 to the lower end of the main body case 8 of the main body 2. Further, between the inner surface of the suction side portion 69 and the inner surface of the discharge side portion 70, the partition portion 61 of the rotating pipe 60 is provided.
A flat portion 72 that tightly connects the suction tube portion 62 of the rotating tube 60 to the suction side portion 69 and hermetically communicates the discharge tube portion 63 of the rotating tube 60 to the discharge side portion 70 is provided. Is provided.

The other end of the suction hose 23 is connected to the suction side 69 of the connection pipe 67, and the suction pipe 62 of the rotary pipe 60 is connected to the dust collection chamber via the suction side 69 and the suction hose 23. 12 suction sections
Connected to 18. The other end of the discharge hose 30 is connected to the discharge side 70 of the connection pipe 67, and the discharge pipe
63 communicates with the electric blower chamber 14 via the discharge side 70, the discharge hose 30, and the discharge part 29. The suction hose 23 is detachably connected to the suction side 69, and the discharge hose 30 is detachably connected to the discharge side 70.

On the other hand, inside the fan chamber 54 of the suction port body part 3, there is provided an inner case 76 for partitioning and forming a turbine chamber 75. Inside the turbine chamber 75 of the middle case 76, a flat air turbine 77 is provided. Are rotatably arranged. In the middle case 76, the discharge pipe 63 of the rotary pipe 60 is connected to the turbine chamber 75.
And a pair of air outlets 79, 79 for discharging air taken into the turbine chamber 75 to the duct chamber 55 and the discharge air path chamber 57 are formed. I have. The air inlet 78 and the air outlets 79, 79 are opened so as to be located on the opposite side of the turbine chamber 75 with respect to the center of the air turbine 77. Further, the facing distance between the air inlet 78 and the inner surface of the fan chamber 54 has a scroll shape gradually narrowing in the rotation direction of the air turbine 77.

The air turbine 77 is integrally provided with a shaft 81 serving as a rotating shaft. Bearings 82, 82 are provided at both ends of the shaft 81. The bearings 82, 82 are fixed to the nozzle case 48, and the shaft 81 is positioned in the drive transmission chamber 56 so that the rotating pipe 60 extends in the axial direction. It is rotatably supported along the rotation axis. Further, an output pulley 83 is integrally provided at an end of the shaft 81 opposite to the side where the air turbine 77 is provided.

In the suction chamber 52 of the suction opening body 3, a rotary blade 85 as a rotary cleaning body is rotatably disposed. The rotating blade 85 has a blade portion 86 as a scraping member formed in an elongated plate shape with rubber or the like, and a raised blade portion 87 as a floor polishing member formed in an elongated plate shape with a raised cloth or the like. The shaft 88 is provided spirally.

At both ends of the shaft center 88, shaft supports 89, 89 are provided.
Are rotatably provided, and these shaft supports 89, 89 are provided in the suction chamber 52.
The rotating blades 85 are removably mounted on bearing portions 90, 90 provided at both ends of the rotating blade 85, respectively, and are rotatably supported.
A pulley is provided at one end of the shaft center 88 located in the drive transmission chamber 56.
An endless belt 93 is provided between the pulley 92 and the output pulley 83 of the shaft 81 of the air turbine 77, and the rotation of the air turbine 77 causes the rotation blade 85 to rotate.
The rotating blade 85 has a raised blade portion 87 formed wider than the blade portion 86, the raised blade portion 87 protrudes from the lower surface of the nozzle case 48, and the blade portion 86
And is rotated in the forward direction with respect to the forward direction of the suction port body 3.

On the other hand, the duct chamber 55 is formed with an opening 95 communicating with the discharge air passage chamber 57. Further, a plurality of outlets 96, 96 that open toward the floor surface, are formed in the discharge air passage chamber 57. In addition, the communication duct chamber 58 is opened at one edge so as to face the floor surface on which the outlets 96, 96 are opened.
A plurality of discharge ports 97, 97 are formed in the edge on the 52 side. Note that these discharge ports 97 are directed obliquely upward, that is, toward the outer peripheral portion of the surface of the rotating blade 85 opposite to the rotation direction of the blade portion 86 and the raised blade portion 87.
An opening is formed so as to blow out 28.

The suction port 51 of the suction port body 3 includes a suction chamber 52, a suction air passage chamber 53, a suction pipe section 62 of a rotary pipe 60, and a connection pipe section.
The suction side portion 69, the suction hose 23, the suction portion 18, the dust collection chamber 12, and the communication port of the partition 11 communicate with the suction port of the electric blower 13 from the suction port 51 to the suction port of the electric blower 13. Is a suction air passage 100 into which air is sucked. Further, the exhaust opening 27 of the electric blower 13 is connected to the electric blower room 14, the discharge part 29, the discharge hose 30, the discharge side part 70 of the connection pipe part 67, the discharge pipe part 63 of the rotating pipe 60, the fan chamber 54, and the turbine chamber. 75, a duct chamber 55, a discharge air path chamber 57, and a discharge port 97 through a communication duct chamber 58. The discharge air path 101 extends from the exhaust opening 27 to the discharge port 97, and the suction air path 100 and the discharge air flow. A recirculation air path 102 in which air recirculates in the path 101 is formed.

Further, the nozzle case 48 is provided with driven front wheel chambers 105, 105 in which driven front wheels (not shown) are rotatably disposed at both ends of a front edge, and are located on both sides of a rear rotating pipe 60. Accordingly, the driven rear wheels 106 are rotatably supported on the shaft, and the suction opening 3 can run on the floor.

Next, the circuit configuration of the vacuum cleaner will be described with reference to the block diagram shown in FIG.

The electric blower 13 is connected to a commercial AC power supply E via a power control triac Tr and a power supply line 32 mounted on a circuit board provided in the circuit room 16. The control means 110 is connected to the gate of the triac Tr. The control means is connected to an operation means 44 provided on the handle portion 4. Further, a first temperature sensor 38a and a second temperature sensor 38b are connected to the control means 110.

Next, the operation of the above embodiment will be described with reference to the flowchart shown in FIG.

First, the power supply line 32 is pulled out to supply commercial AC power, and the grip portion 42 of the handle portion 4 is gripped. Then, the user operates the various buttons 43, 43 of the operating means 44 to drive the electric blower 13 to a desired driving state, and pushes and pulls the handle portion 4 in the front-rear direction to cause the suction opening body portion 3 to travel on the floor surface. Clean.

When the electric blower 13 is driven, the suction port 51
Dust is sucked into the suction chamber 52 together with air from the suction port 52, the suction air passage chamber 53 of the suction port body 3, the suction pipe section 62 of the rotating pipe 60, the suction side section 69 of the connection pipe section 67, the suction hose 23, and the suction pipe. The dust is trapped in the dust collecting bag 19 mounted in the dust collecting chamber 12 via the portion 18.
The air filtered by the dust collecting bag 19 is sucked from the intake port of the electric blower 13 through the first auxiliary filter 21a, passes through the inside of the electric blower 13, and passes through the exhaust opening 27 of the electric blower 13 to the electric blower. The air is discharged into the chamber 14 as discharge air 28.

Further, a part of the discharge air 28 discharged into the electric blower chamber 14 flows into the exhaust chamber 17 and is discharged from the discharge port 17a to the outside air as the discharge air. Flow from the air inlet 78 of the middle case 76 into the turbine chamber 75 through the discharge side 70 of the connection pipe 67, the discharge pipe 63 of the rotary pipe 60, and the fan chamber 54 of the suction port 3; The air turbine 77 is rotated. The rotation of the air turbine 77 causes the rotation blade 85 to rotate via the endless belt 93, scraping dust from the floor into the suction chamber 52,
Polish the floor.

Then, the discharge air 28 rotating the air turbine 77 flows into the duct chamber 55 and the discharge air path chamber 57 through the air outlets 79, 79. Further, the discharge air 28 discharged into the discharge air passage chamber 57 is blown out from the outlets 96, 96 toward the floor surface to blow up dust on the floor surface into the communication duct chamber 58, and to discharge the dust on the floor surface into the communication duct chamber 58. The discharge air 28 blown out into the suction chamber 52 from the discharge ports 97, 97 together with dust, and is blown against the rotating blade 85 to be rotated.
It assists the rotation of 85 and is sucked in again from the suction port 51. When the discharge air 28 is sucked from the suction port 51, a part of the discharge air 28 discharged from the exhaust port 17a as the exhaust air is sucked from the suction port 51 together with the discharge air 28 in an amount of new air.

Here, the control means 110 determines whether or not the temperature ta detected by the first temperature sensor 38a has exceeded a predetermined temperature Ta while the electric blower 13 is being driven (see FIG. 1). Step 1). Then, in the normal cleaning state, the temperature of the discharged air 28 that is recirculated by the newly sucked in air is not increased so much. Therefore, the first temperature sensor 38a detects the set temperature Ta. do not do.
When the control means 110 determines that the temperature ta detected by the first temperature sensor 38a does not exceed the predetermined temperature Ta, the temperature tb detected by the second temperature sensor 38b is determined. It is determined whether or not exceeds a predetermined temperature Tb (step 2). As described above, in the normal cleaning state, since the temperature of the discharge air 28 that is recirculated by the newly sucked-in air is not significantly increased, the discharge air discharged as the exhaust air from the exhaust port 17a is not increased. Since the temperature of the wind 28 has not risen so much, the control means 110
Determines that the temperature tb detected by the second temperature sensor 38b does not exceed the set predetermined temperature Tb,
In response to the above setting operation, the electric blower 13 is driven by a predetermined input, and the state is notified by the notification means 39.

Therefore, even in the recirculation type vacuum cleaner main body 1 that sucks in the discharge air 28 again, the temperature of the recirculated discharge air 28 rises by exhausting a part, and the electric blower 13 and the discharge air 28 recirculate. The members forming the return air passage 102 are not damaged.

Further, when the cleaning is continued and the amount of dust captured in the dust collecting bag 19 increases, or when the dust sucked into the suction air passage 100 is closed, the amount of the return air of the discharge air 28 is reduced. And the temperature of the electric blower 13 rises due to friction between the fan of the electric blower 13 and air and heat generated by electric power supplied to the electric blower 13. Then, when the first temperature sensor detects the temperature rise of the electric blower 13 and the control means 110 recognizes that the predetermined temperature Ta has been exceeded in step 1, the control means 110 reduces the input of the electric blower 13. (Step 3). Here, since the exhaust chamber 17 communicates with the outside air through the exhaust port 17a and the second temperature sensor 38b faces the exhaust port 17a, the temperature in the exhaust chamber 17 detected by the second temperature sensor 38b is detected. Has not risen much. And the control means 110
Notifies the notification means 39 that the input of the electric blower 13 has been reduced due to dust clogging or the like.

On the other hand, if at least a part of the exhaust port 17a is closed by a curtain or furniture during cleaning, the amount of exhaust air exhausted from the exhaust port 17a decreases, and By reducing the amount of air taken in,
The temperature of the discharge air 28 starts to increase with an increase in the amount of the discharge air to be recirculated. Due to the temperature rise of the discharge air 28, the return air path
The temperature in the electric blower room 14, which is a part of 102, also increases.
In this state, the first temperature sensor of the electric blower 13
The temperature ta detected at 38a does not exceed the predetermined temperature Ta. Further, when the exhaust port 17a is closed, the second temperature sensor 38b is cut off from the outside air, and the temperature at the position where the second temperature sensor 38b is disposed is changed from the electric blower chamber 14 to the outside. Heat is transferred. Therefore, the control means 110
Is a predetermined temperature detected by the first temperature sensor 38a in step 1.
The second temperature sensor 38b, which has not detected Ta but has a lower temperature set in step 2, detects the temperature Tb and recognizes a rise in temperature in the electric blower chamber 14, and in step 3, the electric blower
13 and reduce the amount of exhaust
a is closed and the input of the electric blower 13 is reduced.

When the input of the electric blower 13 is reduced, the temperature of the discharge air 28 gradually decreases due to natural cooling, and the first temperature sensor 38a and the second temperature sensor 38b
The control means 110 recognizes that the temperature is lower than the predetermined temperature Ta, Tb in steps 1 and 2 and the input of the electric blower 13 is set again by the operation means 44 in advance and the control means 110 In addition to controlling the driving of the electric blower 13 based on the contents stored in the control unit 110, the notifying unit notifies that the driving state is the driving state based on the setting contents of the operating unit 44 in the normal state.
Notify at 39.

As described above, according to the above embodiment, when the temperature of the electric blower 13 rises and exceeds the predetermined temperature Ta, the input is reduced without stopping the electric blower 13. In a state where the cleaning can be continued, the electric blower 13 is prevented from being damaged by natural cooling, so that the cleaning can be continued while preventing the electric blower 13 from being damaged by heat, and the cleaning workability can be improved.

When the air blower 13 returns to the normal state by natural cooling, the electric blower 13 is returned to the original driving state.
There is no need to reset the drive state of the electric blower 13, and the cleaning workability can be further improved.

Further, since the first temperature sensor 38a is attached to the electric blower 13 which is a heat generating source, the temperature rise of the electric blower 13 can be recognized with certainty, and the damage of the electric blower 13 and the return air passage 102 can be surely reduced. Damage to constituent members can be prevented.

The fact that the exhaust port 17a, which exhausts part of the exhaust air as exhaust air in order to suppress a rise in temperature due to the recirculation of the discharge air 28, is closed is disposed in the exhaust chamber 17 so as to face the exhaust port 17a. Since the temperature tb is detected by the detection of the temperature tb by the second temperature sensor 38b, it is possible to easily recognize the closed state of the exhaust port 17, that is, the flow rate of the discharge air 28 exhausted as exhaust air through the exhaust port 17 with a simple structure. In addition to improving the manufacturability and reducing the cost, the size and weight can be reduced and the cleaning workability can be improved.

On the other hand, the electric blower 13
Is formed and the dust collecting chamber 12 is formed on the upper end side, so that the center of gravity of the vacuum cleaner main body 1 is located on the lower side, and operability can be improved.

Further, since the discharge ports 97, 97 are formed so as to be sprayed on the surface of the rotating blade 85 opposite to the rotation direction of the blade portion 86 and the raising blade portion 87, the discharge ports 97, 97 are formed.
Dust scraped off by the rotating blades 85 from the floor is located in the recirculating flow path where the discharge air 28 blown out from the 97 is sucked through the suction port 51, and the dust can be sucked in efficiently and the rotation of the rotating blades 85 Can be assisted and dust can be scraped out efficiently by the rotating blade 85.

Further, the rotating blade 85 is
To discharge air without providing an air turbine 77.
As compared with a configuration in which the rotating blade 85 is directly blown by rotating the rotating blade 85, the discharge air 28 can surely contribute to the rotation of the rotating blade 85 and the rotating torque of the rotating blade 85 can be increased.

Further, a part of the return air passage 102 is constituted by a flexible suction hose 23 and a discharge hose 30, and one end of each of the suction hose 23 and the discharge hose 30 is detachable. Even if dust is blocked inside, it can be easily removed.

In the above embodiment, the main body 2
The upright type in which the suction port body part 3 is integrally provided at the lower end of the above has been described, but the same applies to a canister type in which the suction port body part 3 is detachably connected to the main body part 2 via a hose and an extension pipe. The effect of is obtained.

Although the recirculation type structure in which the discharge air 28 is recirculated has been described, a suction type structure in which the entire discharge air 28 is exhausted from the exhaust port 17a as exhaust air may be used.

Further, the first temperature sensor 38a and the second
The electric blower depends on whether or not the temperatures ta and tb detected by the temperature sensor 38b have exceeded preset temperatures Ta and Tb.
Although the control for reducing the input of the electric blower 13 is performed, the temperature to be set may be provided in a plurality of stages, and the control for reducing the input of the electric blower 13 may be performed sequentially after each stage. According to this configuration, it is possible to further control the prevention of damage to the electric blower 13 and the continuity of cleaning, and to suppress a decrease in cleaning efficiency due to a decrease in the input of the electric blower 13 due to a rise in temperature,
Damage to the electric blower 13 can be reliably prevented.

On the other hand, the first temperature sensor 38a is connected to an electric blower
Although described as being attached to the thirteenth embodiment, it may be arranged at any position in the return air passage 102. The electric blower 13 that generates heat
The temperature rise of the electric blower 13, which has the highest temperature, can be reliably recognized, and damage to the members constituting the electric blower 13 and the return air passage 102 can be reliably prevented.

The closed state of the exhaust port 17a, that is, the flow rate of the discharge air 28 exhausted as exhaust air through the exhaust port 17a is indirectly detected by detecting the temperature using the second temperature sensor 38b. I explained the configuration to recognize
Any method may be used, such as direct recognition using an anemometer or indirect recognition using a pressure sensor or the like.

On the other hand, the discharge air 28 is supplied to the outlet 9 of the discharge air passage chamber 57.
Openings are formed so as to spray from the discharge ports 97 and 97 to the rotary blade 85 through the communication duct chamber 58 after spraying the floor once from the floors 6 and 96, for example, as in the embodiment shown in FIGS. 9 and 10. Without the communication duct chamber 58, the discharge air 28
May be directly blown out to the suction chamber 52 without blowing it to the floor.

Further, the exhaust chamber 17 having the exhaust port 17a for exhausting part of the discharge air 28 as the exhaust air has been described. However, for example, as shown in the embodiment shown in FIGS. The exhaust port 17a may be provided at any position, such as by forming an exhaust port 17a in the path 101 downstream of the air turbine 77. In the configuration in which the exhaust port 17a shown in FIG. 10 is formed on the downstream side of the air turbine 77, the entire amount of discharge air 28 discharged from the electric blower 13 is
It can contribute to the rotation of the air turbine 77 that rotates the 85, can increase the rotation torque of the air turbine 77, and can improve the cleaning efficiency.

Further, the description has been made with the rotary blade 85 provided. However, the rotary blade 85 and the air turbine 77 for rotating the rotary blade 85 are not provided. It is also possible to adopt a configuration in which the blown-up dust is sucked through the suction port 51.

The exhaust port 17a does not exhaust air toward the cleaning worker and does not blow off dust on the floor other than the area where dust is sucked from the intake port 51 such as around the intake port body 3. It is preferable that the discharge air 28 is exhausted in the direction as exhaust air, for example, a rectifying plate is provided. According to this configuration, it is possible to prevent the cleaning environment from deteriorating and the cleaning efficiency from being lowered due to the blown dust and the exhausted exhaust air blown to the cleaning operator.

On the other hand, the electric blower
Although the description has been made using the electric blower 13 having the exhaust opening 27 for discharging the air flowing through the inside, the air sucked from the intake port is discharged without flowing through the electric blower 13 after flowing through the fan of the electric blower 13. It may be done. In this case, for example, the first temperature sensor 38a may be provided on the fan cover 13a that covers the fan.

[0068]

According to the first aspect of the present invention, the control means sequentially inputs the electric blower in proportion to a rise in the temperature of the discharge air discharged from the electric blower detected by the temperature detecting means. In order to reduce, for example, the amount of dust caught in the dust collection chamber increases, or in a recirculation type in which the discharge air is sucked in again, even if the temperature of the electric blower gradually increases, the temperature of the electric blower is reduced by reducing the input. Cleaning can be continued while suppressing a rise in the temperature of the electric blower to prevent damage due to a rise in the temperature of the electric blower.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the temperature detecting means is provided in the electric blower in which the temperature rises remarkably at the heat generating source, so that the electric vacuum cleaner is surely provided. In addition, it is possible to prevent the electric blower from being damaged by detecting a rise in the temperature of the electric blower.

According to the third aspect of the invention, when the exhaust port is closed and the amount flowing through the exhaust port is reduced, the control means controls the input of the electric blower to be proportional to the decrease in the amount flowing through the exhaust port. Therefore, even in the recirculation type in which the discharged air is recirculated, cleaning can be performed while suppressing the temperature rise of the discharged air.

[Brief description of the drawings]

FIG. 1 is a block diagram of a circuit configuration showing an embodiment of a vacuum cleaner of the present invention.

FIG. 2 is a side sectional view showing a vacuum cleaner main body.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a perspective view of the same.

FIG. 5 is a side sectional view showing the suction port body;

FIG. 6 is a front sectional view of the same.

FIG. 7 is a side sectional view of the same duct chamber.

FIG. 8 is a flowchart showing the operation of the above.

FIG. 9 is a side cross-sectional view of a suction port body showing another embodiment of the present invention.

FIG. 10 is a side sectional view at the position of the exhaust port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 12 Dust collection chamber 13 Electric blower 17a Exhaust port 28 Outlet air 38a First temperature sensor 38b as temperature detecting means 38b Second temperature sensor as exhaust air detecting means 49 Case body 51 Suction port 100 Suction air Channel 101 Discharge air channel 110 Control means

Claims (3)

[Claims] A vacuum cleaner main body accommodating an electric blower; a temperature detecting means for detecting a temperature of a discharge air discharged from the electric blower; A controller for sequentially reducing the input of the electric blower. 2. The vacuum cleaner according to claim 1, wherein the temperature detecting means is provided in the electric blower. 3. A case body accommodating an electric blower and having a dust collecting chamber provided on a negative pressure side of the electric blower, a suction opening formed on a surface facing a surface to be cleaned, and A suction air passage communicating with a negative pressure side of the electric blower through a chamber, and a discharge air discharged from the electric blower having one end communicating with the positive pressure side of the electric blower and the other end communicating with the suction port. A discharge air path, an exhaust port provided in the discharge air path, for exhausting at least a part of the discharge air, an exhaust air detecting means for detecting a flow state of the discharge air flowing through the exhaust port, A vacuum cleaner comprising: control means for sequentially reducing the input of the electric blower in proportion to a decrease in an amount of the discharged air flowing through the exhaust port by a wind detection means.