JPH08173349A - Vacuum cleaner - Google Patents

Abstract

PURPOSE: To provide a vacuum cleaner in which hot air is easily circulated with a simple construction by providing a pressure valve element which opens in response to an increase in negative pressure in a dust collecting chamber formed in a circulation air duct. CONSTITUTION: When an electric-powered blower 25 is driven in a state where a holding section 14 or the end of an extension tube is closed, negative pressure in a dust collecting chamber 19 is increased, and negative pressure in a circulation air duct 7 which opens to a suction opening 47 of the dust collecting chamber 19 is similarly increased. By such an increase in the negative pressure, the difference between the pressure in an electric-powered blower chamber 20 and that in the circulation air duct 7 which are partitioned by a pressure valve element 50 becomes large. A force which energizes a valve element 54 of the pressure valve element 50 toward the circulation air duct 7 by atmospheric pressure in the electric- powered blower chamber 20 acts. When the negative pressure in the circulation air duct 7 reaches a predetermined value, the valve element 54 is moved toward the circulation air duct 7 side by the atmospheric pressure of the electric-powered blower chamber 20 against the energization of a coil spring 55. A through hole 52 of a valve seat 53, which has been closed by the valve element 54 is opened, and hot air which is exhausted into the electric- powered blower chamber 20 is flowed into a dust collecting bag 22 via the circulation air duct 7, a communication hole 74, and a connection tube 69.

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 having an exhaust gas circulation function for circulating exhaust gas of an electric blower into a dust collecting chamber.

[0002]

2. Description of the Related Art Heretofore, as a vacuum cleaner of this type, a structure disclosed in, for example, JP-A-63-79624 has been known.

The electric vacuum cleaner disclosed in Japanese Patent Laid-Open No. 63-79624 has a suction port opening to a dust collecting chamber at a connection port through which a part of the exhaust air of an electric blower provided at the rear of the cleaner body is exhausted. The tip of a flexible hose, one end of which is connected to the suction port connecting portion that opens the mouth, is connected to circulate exhaust air from the electric blower into the dust collecting chamber through the hose.

However, this Japanese Patent Laid-Open No. 63-7962
The device described in Japanese Patent No. 4 circulates the hot air exhaust of the electric blower to the dust collecting chamber through the hose, so that the flexible hose, which is particularly weak against heat, may be damaged by the heat.

Therefore, as a structure in which hot air exhaust is not circulated in the hose, for example, a structure described in Japanese Patent Laid-Open No. 64-97430 is known.

In the electric vacuum cleaner disclosed in Japanese Patent Laid-Open No. 64-97430, the main body of the vacuum cleaner is a dust collection chamber provided with a suction port to which a hose is connected, and a circulation air passage for circulating exhaust air of an electric blower. A shutter plate is provided inside the dust collection chamber, to which a hose is connected, and a shutter plate that can be opened and closed is provided, and the shutter plate closes the suction port to close the switch.
The electric blower is driven, and the exhaust air of the electric blower circulates hot air into the dust collecting chamber through the circulation air passage.

[0007]

However, in the electric vacuum cleaner disclosed in Japanese Patent Laid-Open No. 64-97430, a shutter plate is provided at the suction port, and the shutter plate closes the suction port portion and closes the switch. With this configuration, the exhaust air of the electric blower is circulated, so that the shutter plate and the switch are required, and the installation space for providing the shutter plate and the switch is required. Further, in order to circulate the hot air, the hose connected to the suction port must be pulled out and the shutter plate must be moved to close the suction port, which complicates the operation for circulating the hot air.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric vacuum cleaner having a simple structure and capable of easily circulating hot air.

[0009]

An electric vacuum cleaner according to claim 1 comprises an electric blower chamber provided with an electric blower, and a dust collecting chamber located on the negative pressure side of the electric blower chamber and having a suction port opened. A circulation air passage for circulating the exhaust gas of the electric blower chamber to the dust collection chamber; and a pressure valve body provided in the circulation air passage and opened by an increase in negative pressure on the dust collection chamber side. .

According to another aspect of the electric vacuum cleaner of the present invention, a case body having an electric blower chamber accommodating the electric blower and a dust collecting chamber having a suction port opened on the negative pressure side of the electric blower chamber, and the suction unit. A hose connected to the mouth, a circulation air passage for circulating the exhaust air of the electric blower chamber to the dust collection chamber, and a pressure valve body provided in the circulation air passage and opened by an increase in negative pressure on the dust collection chamber side And a closing holding portion which is provided on the case body and holds and closes the tip of the hose.

[0011]

In the electric vacuum cleaner according to the first aspect of the present invention, the circulation air passage is provided with the pressure valve body that opens when the negative pressure on the dust collecting chamber side increases, so that, for example, the hose connected to the suction port is closed by hand. By doing so, the negative pressure on the side of the dust collection chamber increases and the pressure valve body opens to form a circulation air passage, so the size and weight can be reduced with a simple structure, and the exhaust air from the electric blower chamber can be routed through a hose. Instead, it is circulated to the dust collection chamber to prevent hose damage.

In the electric vacuum cleaner according to the second aspect of the present invention, since the case body is provided with the closing holding portion that holds and closes the tip of the hose by increasing the negative pressure on the dust collecting chamber side, the tip of the hose serves as the closing holding portion. When the electric blower is driven while being held and closed, the negative pressure on the dust collection chamber side increases and the pressure valve body opens to form a circulating air passage, so a compact structure and a light weight can be achieved. The exhaust air from the electric blower chamber is circulated to the dust collection chamber without passing through the hose, and the hose is prevented from being damaged.

[0013]

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 a 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. It has the main body case 2 as a case body formed by joining. This body case is
A bumper 3 which is a sealing member that hermetically joins the lower case 2a and the upper case 2b is sandwiched and joined to a peripheral edge including the front surface to open the front upper surface portion, and the opening of the front upper surface portion is openably and closably closed. The lid 4 is rotatably supported.

A concave groove portion 6 is formed at the lower edge of the upper case 2b so as to face downward and is formed along the lower edge. Further, the bumper 3 includes a lower case 2a and an upper case.
Flat plate-shaped cover 3a that is curved to cover the joint with 2b
And a sandwiching portion 3b which is provided in a wall shape along the longitudinal direction substantially in the center of the inside of the cover portion 3a and is sandwiched between the lower case 2a and the upper case 2b. The lower case 2a and the upper case 2b are joined to close the lower surface of the concave groove portion 6 with the sandwiching portion 3b of the bumper 3 to define the circulation air passage 7.

Further, the main body case 2 is provided with a swivel wheel 8 which can swivel on the lower surface on the front side in the traveling direction. A handle (not shown) is rotatably provided on the upper portion of the main body case 2, and a recessed handle portion 9 is provided on the lower front surface of the main body case 2. Further, the driven rear wheels 10 are rotatably supported on both side surfaces of the main body case 2 in the traveling direction, and the electric vacuum cleaner body 1 can travel by the swivel wheel 8 and the driven rear wheels 10. .

Further, at the upper portion of the upper case 2b, there is formed a closing holding portion 12 which is formed in a concave shape which opens upward, and which has a cylindrical fitting insertion portion 11 which is provided substantially upward in the center thereof. .
The closure holding portion 12 is formed by fitting the insertion portion 11 into the tip of a grip portion 14 provided at one end of the hose 13 or the opening of the tip of an extension pipe (not shown) connected to the grip portion 14. The tip of 14 and the tip of the extension tube are held and the grip
It is designed to close the openings of the tip of 14 and the extension tube. In addition, the blockage holding portion 12 is a holding portion 14 of the hose 13.
Further, in a state in which the extension pipe connected to the grip portion 14 is held, the position is such that it does not cause any trouble when the handle is turned to lift the electric vacuum cleaner body 1.

On the other hand, in the vacuum cleaner body 1, as shown in FIGS. 1 and 2, a partition rib 2d having a suction port 2c at substantially the center is provided. The partition rib 2d is formed with an opening 15 at which one end of the circulation air passage 7 opens, and an annular airtight ring portion 16 integrally provided on the bumper 3 is engaged with the peripheral edge of the opening 15. Has been done. Also, this partition rib 2d
A partition wall 18 having a lattice-shaped communication port 17 is detachably attached to the suction port 2c by closing the suction port 2c.

The electric vacuum cleaner body 1 has a partition rib 2d.
A dust collection chamber 19 that is open at the upper side and is closed by the lid 4 by the partition wall 18 is formed on the front side in the traveling direction of the electric vacuum cleaner body 1 and is electrically driven to the rear of the dust collection chamber 19. The blower room 20 is divided and formed. And the dust collection chamber 19
A dust bag 22 is removably attached to the inside by a holder 21 pivotally mounted in the dust 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 protruding downward and having a lower end portion formed in a concave arc shape along the outer peripheral surface of the fan cover 27, and this upper rib front portion are formed. 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 provided at 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 an 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 fixed to 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 together with air by the intake port 28 of the electric blower 25. It communicates airtightly through 17.

Further, a circuit board (not shown) having control means for controlling the driving state of the electric blower 25 and a leak means (not shown) communicating with the intake side of the electric blower chamber 20 are provided above the electric blower chamber 20. ing. A temperature sensor 37 arranged in the circulation air passage 7 is connected to the circuit board, and the electric blower 25 is set to a predetermined temperature when the temperature in the circulation air passage 7 is detected by the control means and reaches a predetermined temperature. It is designed to drive for hours.

On the other hand, an exhaust chamber 38 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
An exhaust port (not shown), which communicates with the exhaust port of the electric blower 25 via 38, is formed on the rear side of the upper case 2b.

As shown in FIG. 4, a power cord (not shown) 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 40 is rotatably provided with winding means 41 having a mainspring coil or the like for winding the pulled out power cord.

It should be noted that the drum body 40 is electrically and mechanically attached to the other end of a power cord having a power plug (not shown) at one end so that power can be supplied to the electric blower 25.

On the other hand, a suction portion 44 for detachably connecting the hose 43 is provided substantially in the center of the front side of the main body case 2, and the suction portion 44 has an inner opening 45.
And the outer opening 46 are formed so as to face each other. Also,
A cylindrical suction port 47 is formed in the middle opposite to the inner opening 45 and the outer opening 46. The suction port 47 has a front portion that opens toward the front of the electric vacuum cleaner body 1,
The rear part opens to the dust collection chamber 19.

Also, the lower body case 2a and the upper body case
The circulation air passage 7 provided on one side of the electric vacuum cleaner main body 1 by being joined to the electric vacuum cleaner body 2b is connected to the electric blower chamber 20 through an opening portion 15 that is opened at a part of the partition rib 2d that holds the partition wall 18 at one end. The other end is open to the suction port 47 of the suction section 44, which communicates with each other. A pressure valve body 50 is provided at one end of the circulation air passage 7 opening to the partition rib 2d.

As shown in FIGS. 5 to 10, the pressure valve body 50 includes a body portion 51 formed in a substantially cylindrical shape and a body portion 51.
A valve seat portion 53 as an annular seal portion provided at one end of 51 and having a through hole 52 at substantially the center, and a valve body 54 for opening and closing the through hole 52,
A coil spring which is a biasing means provided in the body portion 51.
It is composed of 55 and.

The body portion 51 has a large diameter on one end side in the axial direction, and the valve seat portion 53 is fitted and fixed thereto. Further, a rod-shaped urging means holding portion 57 along the diametrical direction is provided on the other end side of the body portion 51, and the urging means holding portion 57 is formed in a convex shape toward the inside at substantially the center thereof. Coil spring
A positioning part 58 for fixing one end of 55 is provided.
Then, the partition rib 2d is airtightly fitted to the airtight ring portion 16 so that the large-diameter side is on the electric blower chamber 20 side.

Further, the valve seat portion 53 is formed in an annular shape having a through hole 52 at a substantially central portion thereof, and a flange portion is formed in a tubular shape at the periphery of the through hole 52.
60 are provided. Further, at one edge of the outer periphery of the valve seat portion 53, a band member having flexibility in the airtight ring portion 16 of the bumper 3 attached to the opening portion 15 opening to the partition rib 2d that is one end of the circulation air passage 7. 61 is provided, the valve seat portion 53 is integrally connected to the bumper 3, and as shown in FIGS. 5 and 6, the belt body 61 is elastically deformed and the valve seat portion 53 is fitted and fixed to the body portion 51. Has been done.

On the other hand, the valve body 54 is formed in a substantially disc shape having a diameter smaller than the inner diameter of the body portion 51, and a disc portion 64 provided with a positioning projection 63 to which the other end of the coil spring 55 is fixed is provided in the substantially central portion. When,
The disc portion 64 includes a tubular portion 66 formed in a tubular shape along the axial direction toward the positioning convex portion 65 side along the peripheral edge of the disc portion 64. The valve body 54 slides in the body portion 51 along the axial direction so as to sandwich the coil spring 55 between the disc portion 64 of the valve body 54 and the biasing means holding portion 58 of the body portion 51. The flat surface of the disk portion 64 airtightly contacts the flange portion 60 of the valve seat portion 53 by the biasing force of the coil spring 55 to open and close the through hole 52.

The hose 13 has a connecting tube 69 detachably connected to the suction portion 44 of the electric vacuum cleaner body 1 at one end of the flexible hose body 68 and the grip portion 14 at the other end. It is provided. The grip portion 14 is provided with an operation unit (not shown) for setting the drive state of the electric blower 25 via an electric wire (not shown) spirally provided on the hose body 68. further,
The connection pipe 69 has a connection plug 72 that is connected to a terminal 71 provided in the suction portion 47, and is connected to the opening portion 73 of the circulation air passage 7 that opens to the suction portion 47 when connected to the suction portion 44. Communication hole that communicates
74 is formed as an opening.

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

During normal cleaning, the lid 4 is closed,
Pull out a power cord (not shown) wound around the drum body 40, supply power from this pulled-out power cord, insert the connection pipe 69 of the hose 13 into the suction port 47, and connect the hose.
An extension pipe (not shown) and a suction port body are appropriately connected to the grip portion 14 of 13 to perform cleaning.

Then, the electric blower 25, which is supplied with electric power from the power cord, is driven in a predetermined drive state by operating an operation portion (not shown) of the grip portion 14 of the hose 13, and by this drive, a negative pressure is applied to the dust collecting chamber 19 side. The dust is sucked together with air from the suction port 47 through the hose 13, is guided to the dust collecting chamber 19 of the electric vacuum cleaner body 1, and is trapped in the dust collecting 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, and the exhaust chamber. After passing through the 38 in order, it is discharged as exhaust air to the outside air outside the electric vacuum cleaner body 1 through an exhaust port (not shown).

During this cleaning, the pressure valve body 50 is urged by the coil spring 55 so that the valve body 54 is urged by the valve seat portion 53 as shown in FIGS. 5 and 7. 53 through holes
52 is closed and the circulation air passage 7 is closed.

When the electric vacuum cleaner body 1 is stored after the cleaning is completed, the extension tube and the suction port body are removed from the grip portion 14 of the hose 13, and the closing holding portion 12 is fitted into the opening at the tip of the grip portion 14. The insertion portion 11 is fitted to hold the tip of the grip portion 14. Further, the release button (not shown) is operated to rotate the drum body 40 by the winding means 41, and the power cord is wound and stored.

Further, in order to exterminate organisms such as mites trapped in the dust collecting bag 22 in the dust collecting chamber 19, hot air circulation in which the hot air exhaust of the electric blower 25 is made to flow into the dust collecting chamber 19 is cleaned. In the inside, while the electric blower 25 is being driven, the hose 13, the tip of the extension pipe, or the like is closed by hand, or the closing holder 12 is engaged to close the hose 13. On the other hand, at the end of cleaning, the electric blower 25 is driven with the tip of the gripping portion 14 engaged with the blockage holding portion 12 before the power cord is wound and stored. The hose may be removed and the suction port may be directly covered with the hand.

By driving the electric blower 25 with the gripping portion 14 and the tip of the extension tube closed, the negative pressure in the dust collection chamber 19 increases, and the circulation opening to the suction port 47 of the dust collection chamber 19 is performed. Wind path 7
The negative pressure also increases inside. Due to the increase in the negative pressure in the circulation air passage 7, the pressure valve body 50 is used as a sakai to increase the pressure difference between the electric blower chamber 20 and the circulation air passage 7, and the pressure in the electric blower chamber 20 causes the pressure valve body 50 to move. The force that urges the valve element 54 of the above to the circulation air passage 7 side acts. Then, when the inside of the circulation air passage 7 reaches a predetermined negative pressure, the valve body 54 moves toward the circulation air passage 7 side against the bias of the coil spring 55 by the atmospheric pressure of the electric blower chamber 20, As shown in FIG.
Of the hot air exhausted into the electric blower chamber 20 through the circulation air passage 7, the opening 15, the communication hole 74 of the connecting pipe 69, and the connecting pipe 69 to collect dust. It flows into the bag 22 and hot air circulation is performed.

Therefore, the hot air does not flow through the flexible hose body 68, the hose 13 can be prevented from being damaged, and the suction port 47 opening to the dust collecting chamber 19 to form the hot air circulation.
It is not necessary to separately provide a member such as a shutter that closes the door, hot air circulation can be obtained with a simple structure, and it is necessary to provide a component and a space for slidably holding the shutter and the inlet 47 so that the shutter can be opened and closed. Since the vacuum cleaner body 1 is not provided, the size and weight of the vacuum cleaner body 1 can be reduced, the manufacturability can be improved, and the manufacturing cost can be reduced.

Further, since the connection pipe 69 of the hose 13 is provided with the communication hole 74 communicating with the circulation air passage 7, the hose is appropriately used even during cleaning.
The hot air can be circulated by simply closing the tip of 13 by hand and the workability can be improved. Furthermore, since the closing holding portion 12 that holds the hose 13 has a structure for closing the hose 13 for circulating hot air, a separate structure for housing the hose 13 is not required, and the structure is Can be simplified.

Further, the valve seat portion 53 of the pressure valve body 50 is attached to the bumper 3
Since it is formed integrally with, the number of parts can be reduced and the manufacturability can be improved.

Although the valve seat portion 53 is provided integrally with the bumper 3 in the above-described embodiment, the partition rib is not limited to the bumper 3 and partitions the dust collecting chamber 19 and the electric blower chamber 20.
2d and the partition wall 18 to be provided integrally with a seal member for maintaining the airtightness, or without integrally provided with the seal member,
You can do it separately.

Further, the pressure valve body 50 is provided on the body portion 51 so as to be slidable by urging the valve body 54 with the coil spring 55, but the electric blower is constituted by the pressure detecting means made of semiconductor such as silicon. A similar effect can be obtained by a configuration in which the negative pressure on the intake side of 25 is detected and the valve body 54 is slid by a driving means such as an electromagnetic solenoid so that the through hole 52 of the valve seat portion 53 can be opened and closed.

Further, the hose 13 and the tip of the extension pipe are closed by hand, or the suction holding member 12 is engaged and closed to close the suction port 47. However, the hose is removed to directly connect the suction port. The electric blower 25 may be covered with a hand and the electric blower 25 may be driven by operating an operation unit provided on the electric vacuum cleaner body 1.

Further, it has been explained that the connection pipe 69 of the hose 13 is provided with the communication hole 74 so that the circulation air passage 7 opening to the suction port 47 is communicated with the dust collection chamber 19 through the connection pipe 69. Tube 69
The connecting pipe 69 may be formed to have a short length so that the tip of the connecting pipe 69 does not hang on the opening 73 of the circulation air passage 7 opening to the suction port 47.

[0054]

According to the electric vacuum cleaner of the first aspect of the present invention, the circulation air passage is provided with the pressure valve body that opens when the negative pressure on the dust collecting chamber side increases. Therefore, for example, the hose connected to the suction port. The negative pressure on the side of the dust collection chamber increases by closing the valve by hand, and the pressure valve element opens to form a circulation air passage, so the exhaust air from the electric blower chamber can be circulated to the dust collection chamber without passing through a hose. The hose can be prevented from being damaged and the structure can be simplified.

According to the electric vacuum cleaner of the second aspect of the present invention, since the case body is provided with the closing holding portion for holding and closing the tip of the hose connected to the suction port, the tip of the hose is held by the closing holding portion. When the electric blower is driven in the closed state, the negative pressure on the dust collection chamber side increases and the pressure valve body opens to form a circulation air passage, so the exhaust air from the electric blower chamber is collected without passing through the hose. It can be circulated in the chamber, the hose can be prevented from being damaged, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of an electric vacuum cleaner according to the present invention.

FIG. 2 is a side view with a part thereof cut away.

FIG. 3 is a front view in which a part of the same is cut away.

4 is a sectional view taken along the line AA ′ of FIG.

5 is a cross-sectional view taken along the line BB ′ of FIG. 6 showing the vicinity of the pressure valve body.

FIG. 6 is a front view of the same.

7 is a cross-sectional view taken along the line CC ′ of FIG. 6 above.

[Fig. 8] Same as above, but with the vicinity of the pressure valve body before assembly, taken along the line DD in Fig. 9.
It is a cross-sectional view.

FIG. 9 is a front view of the same.

FIG. 10 is an explanatory diagram showing an open state of the pressure valve body of the above.

[Explanation of symbols]

 1 Main body of vacuum cleaner 2 Body case as case body 7 Circulation air passage 12 Closure holding part 13 Hose 19 Dust collection chamber 20 Electric blower chamber 25 Electric blower 47 Suction port 50 Pressure valve body

Claims (2)

[Claims] 1. An electric blower chamber provided with an electric blower, a dust collecting chamber located on the negative pressure side of the electric blower chamber and having a suction port opened, and exhaust gas of the electric blower chamber is circulated to the dust collecting chamber. An electric vacuum cleaner, comprising: a circulation air passage for allowing the circulation air passage; and a pressure valve body provided in the circulation air passage and opened by an increase in negative pressure on the dust collecting chamber side. 2. A case body having an electric blower chamber accommodating the electric blower and a dust collection chamber having a suction port opened on the negative pressure side of the electric blower chamber, and a hose connected to the suction port. A circulation air passage that circulates the exhaust air of the electric blower chamber to the dust collection chamber, a pressure valve body that is provided in the circulation air passage and opens due to an increase in negative pressure on the dust collection chamber side, and a case body that is provided in the case body. An electric vacuum cleaner, comprising: a closing holding portion that holds and closes the tip of the hose.