JPH0838398A - Electric cleaner - Google Patents

Abstract

PURPOSE:To efficiently cool a circuit board with simple configuration by providing a sucking hole communicated to external air and a sucked air leak hole opened/closed by a valve element and communicated to the sucking side of a motor-driven air blower in a circuit chamber for housing the circuit board to control the driving state of the motor-driven air blower. CONSTITUTION:When a sucking port 74, hose, extension pipe are clogged by sucked dust during cleaning, negative pressure on the sucking side of a motor- driven air blower 25 is increased. When negative pressure in a circuit chamber 38 of external air pressure communicated through the sucking hole to external air and on the sucking side of the motor-driven air blower 25 is higher than a prescribed value, a valve element 48 is energized toward the circuit chamber 38 by external air pressure, a coil spring 49 closing a sucked air leak hole 47 is elastically deformed against the energization, the valve element 48 is slid and moved to the sucking side of the motor-driven air blower 25, and the sucked air leak hole 47 is opened. With this opening, external air flows from the gap between a main body 2 of a case and a lid body 4 through the sucking hole into the circuit chamber 38, and a circuit board 39 is cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner provided with a leak hole in a circuit chamber for accommodating a circuit board for controlling a driving state of an electric blower.

[0002]

2. Description of the Related Art Conventionally, as a vacuum cleaner of this type, a structure disclosed in, for example, Japanese Patent Laid-Open No. 4-84920 is known.

In the electric vacuum cleaner disclosed in Japanese Patent Laid-Open No. 4-84920, a drive unit is provided on a valve body for opening and closing a leak hole, and a negative pressure generated by an electric blower is detected to detect a change in the negative pressure. There are provided a pressure detection means for which the output signal changes correspondingly, and a control means for controlling the drive of the drive unit.

During cleaning, the dust blown into the dust collecting chamber together with air is captured by the dust collecting filter by driving the electric blower, and the pressure detecting means detects the negative pressure generated by the electric blower. A control unit that outputs an output signal that changes in response to a change in negative pressure and that controls the drive state of the electric blower also controls the drive unit according to the output signal from the pressure detection unit.

That is, while the amount of dust captured is still small, the dust collecting filter is not clogged so much, and the negative pressure is below a certain set value, the control means causes the drive unit to drive the valve body. Hold the leak hole closed. on the other hand,
When the negative pressure becomes equal to or higher than a certain set value due to an increase in the amount of captured dust and clogging of the dust collecting filter, the control unit causes the drive unit to open the valve body. Then, in this state, outside air is taken into the electric blower through the open leak hole to prevent burnout of the electric blower and thermal deformation of the electric vacuum cleaner body.

[0006]

On the other hand, the above-mentioned JP-A-4-
In the vacuum cleaner described in Japanese Patent Publication No. 84920, the pressure detecting means, the control means for controlling the driving state of the driving part, and the electric blower are composed of a circuit board on which heat-generating circuit components such as resistors and transistors are mounted. Therefore, it is necessary to take measures to cool the circuit components in order to obtain stable pressure detection and drive unit control without causing malfunctions.For example, when mounting a heat sink etc. for each circuit component, However, there is a problem that the productivity of the circuit board is improved, the cost of parts is increased, and the circuit board cannot be downsized.

The present invention has been made in view of the above problems, and an object thereof is to provide an electric vacuum cleaner capable of efficiently cooling a circuit board with a simple structure.

[0008]

The electric vacuum cleaner of the present invention comprises:
A case body, an electric blower chamber provided in the case body for accommodating an electric blower, a dust collection chamber provided in the case body, which is located on the intake side of the electric blower and has an inlet port opened, and provided in the case body A circuit chamber that accommodates a circuit board that controls the drive state of the electric blower, an intake hole that communicates with the outside air to the circuit chamber, and a communication chamber that communicates with the intake side of the electric blower. The intake air leak hole is provided, and a valve body that is openably and closably provided in the intake air leak hole and introduces air in the circuit chamber when the intake side of the electric blower reaches a predetermined negative pressure.

[0009]

In the electric vacuum cleaner of the present invention, the air intake which communicates with the intake side of the electric blower is opened and closed by the intake hole communicating with the outside air and the valve body in the circuit room which accommodates the circuit board for controlling the driving state of the electric blower. Since the leak hole is provided, when the intake side of the electric blower reaches a predetermined negative pressure and the intake leak hole opens, the outside air introduced from the intake hole is introduced into the circuit chamber to cool the circuit board and then the electric power is supplied from the intake leak hole. Since it is introduced to the intake side of the blower, the cooling air flow path of the circuit board can be obtained with a simple structure, and the cooling for protecting the electric blower can also be used for cooling the circuit board, and the cooling efficiency of the circuit board is improved. improves.

[0010]

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

1 to 4, reference numeral 1 denotes an electric vacuum cleaner body, which includes a lower case 2a having an open upper surface and an upper case 2b for closing a rear upper surface of the lower case 2a. Has a main body case 2 as a case body which is joined by sandwiching a bumper 3 on a peripheral edge including a front surface and has a front upper surface portion opened, and the main body case 2 has a lid for opening and closing the front upper surface opening openably. It is formed by rotatably supporting the body 4.

The body case 2 has a swivel wheel 5 attached to the lower surface of the front side in the traveling direction. A handle 6 is rotatably provided on the upper portion of the main body case 2.

Further, as shown in FIGS. 1 to 3, a hose mounting hole 7 that expands upward is formed on the upper surface of the rear portion of the main body case 2.

On the other hand, as shown in FIG. 6, an attachment means 10 is attached to the extension pipe 9 connected to a hose (not shown), and this attachment means 10 has an annular portion 11 into which the extension pipe 9 is fitted.
Further, the outer peripheral surface of the annular portion 11 is provided with a locking portion 12 which projects outward and whose tip projects downward in a substantially L shape. And
The locking portion 12 of the mounting means 10 is engaged with the hose mounting hole 7,
As shown in FIG. 6, the extension tube 9 is detachably attached to the rear portion of the main body case 2.

When a stress such as an operator hits the hose or the extension pipe 9 while the extension pipe 9 is attached by the attachment means 10, the locking portion 12 of the attachment means 10 has the hose attachment hole 7 The hose attachment hole 7 is supported by the lower end of the inside and the front edge of the electric vacuum cleaner body 1 in the traveling direction, but the hose attachment hole 7 gradually increases from the rear edge of the electric vacuum cleaner body 1 in the traveling direction to the front edge. Since the front edge of the hose mounting hole 7 abuts on the outer peripheral surface of the annular portion 11, which is the upper portion of the base end portion of the locking portion 12, the hose mounting hole 7 contacts the base end portion of the locking portion 12. The stress applied to the locking portion 12 is reduced as compared with the case of contacting, and damage to the mounting means 10 such as breakage of the locking portion 12 can be prevented.

Further, 14 is a driven rear wheel, and this driven rear wheel 14
Is formed into a disk shape in which an annular tire portion 15 made of rubber or the like is fitted and fixed to the outer peripheral edge, and is rotatably provided on both sides of the main body case 2 in the traveling direction. The slewing wheel 5 and the driven rear wheel 14 can travel.

On the other hand, in the main body 1 of the electric vacuum cleaner, as shown in FIGS. 1 and 2, a partition wall 18 having a grid-like communication port 17 is provided.
As a result, the dust collection chamber 19 whose upper side is opened is defined on the front side in the traveling direction of the vacuum cleaner body 1, and the electric blower chamber 20 is defined behind the dust collection chamber 19. A dust bag 22 is detachably mounted in the dust collection chamber 19 by a holder 21 pivotally mounted in the dust collection chamber 19.

On the front surface of the partition wall 18, an auxiliary dust collecting filter 24 that covers the communication port 17 is detachably mounted.
The dust collecting bag 22 and the auxiliary dust collecting filter 24 are attached and detached via the upper opening of the dust collecting chamber 19.

On the other hand, in the electric blower room 20, an electric blower is installed.
25 are arranged. The electric blower 25 is composed of an electric portion 26 (not shown) for driving a fan to rotate around a shaft, and a fan cover 27 for covering the fan. An intake port 28 is formed in the center of the front surface of the fan cover 27, and an exhaust port (not shown) is formed in the frame of the electric section 26. A motor head 29, in which a bearing for supporting a shaft (not shown) for rotationally driving the fan is provided, is formed at the rear end surface of the electric portion 26 in a cylindrical shape so as to protrude rearward.

An annular rubber support 31 is fitted to the outer peripheral edge of the front end of the electric blower 25, and a rubber shock absorber 32 is attached to the motor head 29 of the rear end. 29
It is attached to cover.

On the other hand, on the lower surface of the upper case 2b, an upper rib front portion 33 which protrudes downward and whose lower end portion is formed in a concave arc shape along the outer peripheral surface of the fan cover 27, and this upper rib front portion An upper rib rear portion 34, which is positioned rearward of 33 and projects downward substantially in parallel, and whose lower end portion is formed in a concave arc shape along the outer peripheral surface of the buffer body 32 attached to the motor head 29 of the electric portion 26, is formed. Each is formed to project.

Further, on the upper surface of the lower case 2a, facing the upper rib front portion 33 and the upper rib rear portion 34, respectively, projecting upward, and the upper end portion is formed in a concave arc shape along the outer peripheral surface of the fan cover 27. A lower rib front portion 35 formed on the lower rib, and a lower rib rear portion 36 whose upper end portion is formed in a concave arc shape along the outer peripheral surface of the shock absorber 32 attached to the motor head 29 of the electric portion 26.
Are formed so as to project.

The shock absorber 32 attached so as to cover the motor head 29 of the electric blower 25 is attached to the rear portion 3 of the upper and lower ribs.
The rear ends of the electric blower 25 are sandwiched and fixed by the upper and lower rib rear parts 34 and 36 via the buffer 32.

Further, the outer peripheral surface of the annular rubber support 31 fitted to the front end of the electric blower 25 is clamped and fixed by the upper and lower rib front parts 33 and 35, and the front end of the electric blower 25 is supported by the rubber support.
The upper and lower ribs 33 and 35 are sandwiched and fixed via 31.

The front end side of the electric blower 25 is provided with a rubber support 31 which communicates with a dust collecting chamber 19 provided with a dust collecting bag 22 for collecting the dust sucked by the intake port 28 of the electric blower 25 together with the air. It communicates airtightly through 17.

A circuit room 38 is provided above the electric blower room 20.
1, and a circuit board 39 having a control means for controlling the drive state of the electric blower 25 is installed in the circuit room 38 as shown in FIGS. 1, 2 and 5. It is sandwiched between a rib (not shown) protruding upward from the bottom surface and a rib (not shown) protruding downward from the upper surface of the circuit chamber 38, and is held so as to be positioned in the middle of the circuit chamber 38. It is housed. Then, the circuit board 39 is mounted on the surface of the hard printed wiring circuit board 40 with a circuit component 41 for controlling the drive of the electric blower 25 such as a resistor, a diode, a capacitor, a transistor, a resistor array, and a hybrid central processing element. This constitutes the control means. Also,
A heat sink 42 is attached to the circuit board 39 between the circuit component 41 and the printed wiring circuit board 40 with screws 43. The heat radiating plate 42 is bent to have a substantially L-shaped cross section, and is hermetically arranged by a seal member 44 so that the lower portion thereof is located on the intake side of the electric blower chamber 20.

Further, the circuit chamber 38 has a cylindrical portion 46 having a substantially cylindrical shape.
Is formed in a protruding manner, and the electric blower chamber is formed at the upper end of the tubular portion 46.
An intake leak hole 47 communicating with the intake side of 20 is formed. Further, in the tubular portion 46, a substantially disc-shaped valve body 48 that closes the intake leak hole 47 is slidably arranged in the vertical direction,
A coil spring 49 is provided on the lower surface of the valve body 48 to constantly urge the valve body 48 to close the intake leak hole 47. The valve body 48 is installed in the circuit room 38 in the electric blower room 20.
The intake side air is provided so as not to flow backward and be introduced.

An intake hole 50 is formed in the circuit chamber 38 so that the circuit chamber 38 communicates with the outside air. The intake hole 50 and the intake leak hole 47 are provided at separate positions so that the circuit board 39 is interposed therebetween.

On the other hand, an exhaust chamber 52 is formed in the electric vacuum cleaner body 1 at the rear of the electric blower chamber 20, and an exhaust gas is exhausted to the rear upper part of the upper case 2b of the electric vacuum cleaner body 1. Room
Exhaust port 53 communicating with the exhaust port of the electric blower 25 via 52
However, an opening is formed on the rear side of the upper case 2b.

Further, a substantially circular water draining hole 55 communicating with the circuit chamber 38 is formed in the upper portion of the exhaust chamber 52, and the motor head 29 of the electric blower 25 is held at the edge of the water draining hole 55. A guide wall portion 56 is provided along the wall surface of the rear portion 34 of the upper rib. The guide wall portion 56 prevents the water that has entered the circuit chamber 38 from staying so as to close the drainage hole 55 without passing through the drainage hole 55 due to surface tension, so that the drainage hole 55 is prevented. It is formed so as to easily flow into the exhaust chamber 52 via the.

As shown in FIG. 4, a power supply cord 58 for supplying electric power to the electric blower 25 is wound inside the electric vacuum cleaner body 1 and is located on the left side in the traveling direction of the electric blower chamber 20. The drum body 59 is rotatably provided with winding means 60 having a mainspring coil for winding the pulled out power cord 58.

The drum body 59 has a power plug at one end.
The other end of the power cord 58 provided with 61 is attached electrically and mechanically so that power can be supplied to the electric blower 25.

Further, a winding means 60 is provided above the drum body 59.
The locking means (not shown) that stops the rotation of the drum body 59 that winds the power cord 58 by means of this, and by releasing this stop, the drum body 59 is rotated by the winding means 60 to wind the power cord 58 and rotate. A release means (not shown) having a release button 62 provided on the upper surface is provided.

When the power cord 58 is pulled out, the locking means of the drum body 59 idles and is rotated, and when the pulling out of the power cord 58 is stopped, the rotation of the drum body 59 is stopped by the locking means. Further, the drum body 59 is operated by the release button 62 to release the locking means stopped by the releasing means by locking the drum body 59, and is rotated by the winding means 60 to rotate the power cord 59. It is designed to be wound up.

Further, as shown in FIGS. 4 and 7, on the rear surface of the upper case 2b of the electric vacuum cleaner main body 1, at a position facing the upper end of the drum body 59, it expands backward and downward in a trapezoidal manner. A concave plug insertion portion 64 is formed. further,
A power cord 58 is inserted into the plug insertion portion 64 so as to be able to move forward and backward, and a cord opening 65 having a diameter smaller than that of the power plug 61 is formed so that the peripheral edge thereof abuts the power plug 61 and the power plug 61 is not inserted. .

Further, the vacuum cleaner body 1 of the plug insertion portion 64
As shown in FIG. 8, shaft support holes 66, 66 are formed on the side walls facing each other in the width direction so as to face the lower end edge of the cord opening 65. Then, a cylindrical member 67 whose both ends are rotatably fitted is attached to these shaft support holes 66, 66. The cylindrical member 67 is formed by coating rubber or the like in order to prevent friction with the power cord 58 and improve contact.
To form a shaft member that is rotatably fitted in the shaft support hole 66,
It is also possible to form a projection on the outer peripheral surface in a concave-convex shape along the axial direction.

Further, on the lower surface of the plug insertion portion 64, there is a detachment which is located near the lower edge of the cord port 65 on the side of the expansion direction of the plug insertion portion 64 of the cylindrical member 67 and contacts the outer peripheral surface of the cylindrical member 67. A stopper 68 is provided so as to project. The retaining portion 68 is formed so that the surface that contacts the cylindrical member 67 has a small coefficient of friction with the cylindrical member 67. The retaining portion 68 is
It may be projectingly provided so as to face the cylindrical member 67 with a slight gap.

Further, as shown in FIG. 3, regulating portions 69, 69 for regulating axial sliding of the cylindrical member 67 are provided near the edges of the shaft supporting holes 66, 66, respectively. These regulatory units 69,
The facing distance of 69 is formed to be slightly longer than the length dimension of the cylindrical member 67 in the axial direction. When the cylindrical member 67 is axially supported, one end in the axial direction is inserted into one axial support hole 66 until it abuts against the restricting portion 69, and the main body case 2 is elastically deformed while the cylindrical member 67 is axially supported. The end is inserted into the shaft support hole 66, the deformation of the main body case 2 is released, and the shaft is supported rotatably in the shaft support holes 66, 66.

On the other hand, as shown in FIGS. 1 to 3, a suction portion 71 for detachably connecting a hose (not shown) is provided substantially in the center of the front side of the main body case 2. The suction portion 71 has an inner opening 72. And the outer opening 73 are formed opposite to each other. Further, a cylindrical suction port 74 is formed in the middle facing the inner opening 72 and the outer opening 73. A front portion of the suction port 74 is open to the front of the vacuum cleaner body 1 and a rear portion thereof is open to the dust collecting chamber 19. Further, the suction portion 71 slidably supports a shutter (not shown) that opens and closes the suction port 74.

The lid 4 has a rear end pivotally attached to the upper case 2b and is formed so as to cover the dust collecting chamber 19 from above so as to be openable and closable.

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

During normal cleaning, the lid 4 is closed,
The power cord 58 wound around the drum body 59 is pulled out through the cord port 65, power is supplied from the pulled out power cord 58, and a shutter (not shown) is slid to open the suction port 74. With this shutter open, a hose (not shown), the extension tube 9, and a suction port (not shown) are properly connected for cleaning. The electric blower 25 is driven by the electric power supplied from the power cord 58, and the dust is sucked together with the air from the suction port 74 via the hose by this driving, and is guided to the dust collecting chamber 19 of the electric vacuum cleaner body 1 to collect the dust. It is captured in the dust bag 22.

The air filtered by the dust collecting bag 22 is supplied to the auxiliary dust collecting filter 24, the communication port 17, the intake port 28 of the electric blower 25, the inside of the electric blower 25, the exhaust port of the electric blower 25,
The electric vacuum cleaner body 1 is sequentially passed through the exhaust chamber 52 and from the exhaust port 53.
It is exhausted to the outside air as exhaust air.

When the suction port 74, the hose, the extension tube 9, the suction port body, or the like is blocked during cleaning, the negative pressure on the suction side of the electric blower 25 increases, and the suction port 50 External air pressure circuit room 38 and electric blower
When the negative pressure on the suction side of 25 becomes equal to or more than a predetermined value, the coil spring 49 that urges the valve body 48 toward the circuit chamber 38 by the atmospheric pressure to close the intake leak hole 47.
However, the valve body 48 is elastically deformed against the bias and the valve body 48 is electrically driven by the blower 25.
The intake leak hole 47 opens by slidingly moving to the suction side. Due to the opening of the intake leak hole 47, outside air flows into the circuit chamber 38 through the intake hole 50 from the gap between the main body case 2 and the lid body 4, and the inflowing outside air cools the circuit board 39. It flows into the intake side of the electric blower chamber 20 through the intake leak hole 47, is exhausted as exhaust air from the electric blower 25 through the exhaust chamber 52 and the exhaust port 53, and prevents the electric blower 25 from being heated. ing.

Therefore, the outside air that flows in at the time of a leak in order to prevent damage due to heating of the electric blower 25 always cools the circuit board 39, so that a plurality of separate heat sinks 42 and a complicated heat sink are required to improve heat dissipation efficiency. The flow path of the cooling air for the circuit board 39 can be obtained without using the bent heat dissipation plate 42 and the like, the circuit board 39 can be reliably cooled, and the circuit board 39 can be downsized. Further, since the outside air flowing into the intake side of the electric blower chamber 20 from the intake leak hole 47 hits the heat dissipation plate 42 to cool the heat dissipation plate 42, the cooling efficiency of the circuit board 39 can be further improved, and the circuit board 39 can be downsized. Can be converted. Further, the flow path of the cooling air for the circuit board 39 can be obtained with a simple structure in which the intake hole 50 and the intake leak hole 47 are opened in the circuit chamber 38.

Since the air on the intake side of the electric blower chamber 20 does not flow back into the circuit chamber 38 by the valve body 48 and is not introduced, dust enters the circuit chamber 38 and adheres to the circuit board 39. Electric blower due to short circuit board 39
25 can be prevented from malfunctioning.

Further, during cleaning, the electric vacuum cleaner body 1 or the like comes into contact with a table, furniture or the like (not shown), and a vase or a cup containing water or the like placed on the table or furniture falls down, so that water, etc. When the electric vacuum cleaner body 1 is covered with water, water enters the circuit chamber 38 from the joint portion between the lower case 2a and the upper case 2b, the joint portion between the main body case 2 and the lid body 4, and the like. Then, the infiltrated water immediately flows into the exhaust chamber 52 from the inside of the circuit chamber 38 along the guide wall portion 56 through the drain hole 55,
It does not stop in the circuit room 38. For this reason, the water that has flown into the exhaust chamber 52 without being damaged by the circuit board 39 is dried by the warm exhaust air of the electric blower 25, and the water does not accumulate in the electric vacuum cleaner body 1 and the water invades. It is possible to prevent damage to each member.

When the electric vacuum cleaner body 1 is stored, the release button 62 is operated to release the locking means which is locked by the releasing means (not shown) and stopped on the drum body 59. The drum body 59 is rotated by the winding means 60, and the power cord 58 is wound and stored. Then, the hose is removed and the shutter is slid to close the suction port 74.

When the power cord 58 is wound and accommodated, the power cord 58 contacts the cylindrical member 67 provided at the lower end edge of the cord port 65, and the cylindrical member 67 rotates. Therefore, no friction occurs between the power cord 58 and the lower edge of the cord port 65,
The wear of the power cord 58 and the lower edge of the cord port 65 can be prevented, the winding load of the power cord 58 due to friction is reduced, and the winding performance of the power cord 58 can be improved. Further, since it is not necessary to increase the winding torque of the winding means 60 of the drum body 59 due to the reduction of the winding load, the winding means 60 can be downsized and simplified, and the winding speed of the power cord 58 is reduced. Then, the power plug 61 can be prevented from jumping up and strongly hitting the main body case 2 or the like, and the power plug 61 or the main body case 2 or the like can be prevented from being damaged.

The rotation of the cylindrical member 67 causes the cylindrical member 67 to rotate.
End portions in the axial direction of and the shaft supporting hole for supporting the cylindrical member 67.
Friction occurs between 66 and 66, but the retaining portion 68 is a cylindrical member 67.
Since it is located on the expansion direction side of the plug insertion part 64 and is in contact with the cylindrical member 67, it is possible to prevent the shaft support holes 66, 66 from being worn and expanding to the expansion direction side of the plug insertion part 64. Shaft support hole 66,
Rattling of the cylindrical member 67 due to the spread of 66 can be prevented, and smooth rotation of the cylindrical member 67 can be obtained for a long period of time. Further, even if it is used for a long period of time, it is possible to prevent the cylindrical member 67 from coming off due to the expansion of the shaft support holes 66, 66, and the winding performance of the power cord 58 can be stably and reliably obtained for a long period of time.

In the above embodiment, the intake leak hole
The valve body 48 for opening and closing 47 is provided in the cylindrical portion 46 so as to be slidable by being biased by the coil spring 49, but the electric blower is formed by the pressure detecting means made of a semiconductor such as silicon.
The same effect can be obtained by detecting the negative pressure on the intake side of 25 and sliding the valve body 48 by a drive means such as an electromagnetic solenoid to open and close the intake leak hole 47. In addition, the circuit board
A temperature sensor etc. is installed in the vicinity of 39, and circuit board 39 and circuit room
The intake leak hole 47 may be opened when the temperature inside the chamber 38 reaches a predetermined temperature or higher.

[0052]

According to the electric vacuum cleaner of the present invention, in the circuit room accommodating the circuit board for controlling the driving state of the electric blower,
Since the intake hole communicating with the outside air and the intake leak hole opened and closed by the valve body and communicating with the intake side of the electric blower are provided, the intake side of the electric blower reaches a predetermined negative pressure to open the intake leak hole. Since the outside air introduced from the holes is introduced into the circuit chamber to cool the circuit board, and then introduced from the intake leak hole to the intake side of the electric blower chamber, the flow path of the cooling air of the circuit board can be obtained with a simple structure. The cooling for protecting the blower can be used for cooling the circuit board, and the cooling efficiency of the circuit board can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric vacuum cleaner according to an embodiment of the present invention at a position of an intake leak hole of an electric vacuum cleaner body.

FIG. 2 is a cross-sectional view of the electric vacuum cleaner body at the position of the circuit board.

FIG. 3 is a plan view in which a part of the electric vacuum cleaner body is cut away.

FIG. 4 is a side view in which a part of the same electric vacuum cleaner body is cut away.

FIG. 5 is a partially cutaway perspective view showing the same circuit room.

FIG. 6 is a cross-sectional view showing the vicinity of the same hose mounting hole.

FIG. 7 is a rear view of the vicinity of the cord port at the rear of the electric vacuum cleaner body in the traveling direction.

FIG. 8 is an exploded perspective view of the vicinity of the cord opening of the same as above.

[Explanation of symbols]

 1 Vacuum cleaner main body 2 Case body 19 Dust collection room 20 Electric blower room 25 Electric blower 38 Circuit room 39 Circuit board 47 Intake leak hole 48 Valve body 50 Intake hole 74 Suction port

Claims (1)

[Claims] 1. A case body, an electric blower chamber provided in the case body for accommodating an electric blower, and a dust collection chamber provided in the case body and located on an intake side of the electric blower and having an intake port opened, A circuit chamber that is provided in the case body and that houses a circuit board that controls the drive state of the electric blower; an intake hole that is provided in communication with the outside air in the circuit chamber; and an intake side of the electric blower in the circuit chamber. An intake leak hole provided so as to communicate with the air blower, and a valve body that is openable and closable in the intake leak hole and introduces air in the circuit chamber when the intake side of the electric blower reaches a predetermined negative pressure. An electric vacuum cleaner characterized by.