JPS6054051B2 - Vacuum cleaner dust removal device - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dangerous device for a vacuum cleaner that is equipped with a wave-shaped main filter that captures fine dust on the downstream side of a net filter that captures coarse dust. In particular, the present invention relates to a device which uses an air flow from a rectifying plate having slits to reduce the roughness of the lower part of a wave-shaped main filter, and also prevents coarse dust from adhering to a net filter by a vortex flow generated by coarse dust guiding ribs.

[Conventional technology]

Conventionally, in this type of vacuum cleaner (such as the 1980-696 Utility Model), the dust-containing airflow sucked into the dust case flows toward the entire surface of the net filter, so coarse dust such as cotton dust is removed from the net filter. It adheres to almost the entire surface of the surface.

In order to remove coarse dust adhering to the net filter, even if a dust particle collides with a vibrator installed in a part of the net filter to vibrate the net filter, it will not adhere to the entire surface of the net filter. It is not possible to collect coarse dust all over the place. In addition, a vacuum cleaner with a harsh filter installed above and a detour circuit installed above
No. 0-39258) had the disadvantage that fine dust adhered to and bit into the filter near the air passage, easily causing clogging.

[Problem that the invention seeks to solve]

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention makes it possible to reliably remove coarse dust attached to the net filter by simply causing the net filter to vibrate by causing a dust remover to collide with a vibration receiver provided in a part of the net filter. A large number of slits are drilled at the bottom of the rectifying plate at positions corresponding to the troughs of the wave-shaped main filter, and part of the airflow is directed below the main filter to remove dust from areas where the vibration caused by the dust remover is relatively weak. At the rear of the top of the net filter, a non-ventilated rectifier plate is installed vertically between the net filter and the main filter to form a main bypass passage from the net filter to the main filter. A part of the airflow that collides with the net filter passes through the net filter, flows back upstream of the net filter by the baffle plate, and blows off the coarse dust attached to the net filter, while the airflow that has been accelerated in the main detour passage is It flows from top to bottom along the wave pattern of the filter, blowing off dust attached to the main filter and automatically cleaning both the net filter and the main filter.

However, the coarse dust inside the dust case is blown away by the airflow that collides with the baffle plate and flows back upstream of the net filter. However, it has the disadvantage that it will stick to the net filter again. The object of the present invention is to provide a vacuum cleaner which solves the above-mentioned drawbacks and prevents the coarse dust blown away by the airflow flowing back upstream of the net filter from re-adhering to the net filter. The purpose of the present invention is to provide a dust removal device.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration.

A dust case having a suction port and housing a net filter frame is detachably provided in front of the main case equipped with an electric blower, and a central support is provided in contact with the back of the net filter of the net filter frame. , a transducer is fixed to the upper part of the central support, one end of a leaf spring-shaped net dust remover is fixed to approximately the center, the frame of the net filter is inserted and fixed, and a dust remover is fixed to the back of the main filter. In the dust removal device for a vacuum cleaner provided with a net filter frame, in front of the main filter frame, a rectifier plate having a plurality of slits at the bottom corresponding to the troughs of the wave-shaped main filter covers the net filter frame except for the upper part thereof. provided so as to form a main bypass passage to the main filter, and at a position overlooking the main bypass passage,
The dust removal device for a vacuum cleaner is characterized in that a coarse dust guiding rib protruding from the inside of the gust case is formed on the upstream side of the net filter.

As a result, the coarse dust is concentrated near the net filter's vibration receiver, which reduces the adhesion force of the coarse dust to the net filter and increases the peeling force of the coarse dust attached to the net filter. Therefore, coarse dust can be reliably removed, and air can always be blown below the relatively weak main filter to effectively remove dust.

Further, since the coarse dust guide ribs that protrude horizontally from the inside of the dust case on the upstream side of the net filter are opposed to the portion of the net filter near the main detour passage, coarse dust once attached to the net filter can be removed. is blown into the dust case, and the blown coarse dust can be trapped around the coarse dust guiding ribs without re-adhering to the net filter.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings of one embodiment.

In the drawings, the main body of the vacuum cleaner consists of a main body case 1 and a dust case 2, and the dust case 2 is detachably attached to the front surface of the main case 1.

A groove-shaped receiving portion 3 is provided at the lower front surface of the main body case 1, and an engaging protrusion 4 that engages with the receiving portion 3 is provided at the lower rear surface of the dust case 2.

A clamp 5 that seesaws is provided at the top of the dust case 2. A locking receiving portion 7 for receiving a locking pawl 6 at the tip of the clamp 5 is provided at the upper front surface of the main body case 1. The dust case 2 is detachably attached to the main body case 1 using the clamp 5 and the like.
An electric blower 10 is provided inside the main body case 1 .

The electric blower 10 includes a blower section 11 and an electric motor 12. This electric blower 10 is placed in an electric blower storage chamber 15 with the front side of the blower section 11 and the rear side of the electric motor 12 interposed between vibration-proof combs 13 and 14. An exhaust port 16 for discharging exhaust air from the electric blower 10 is provided on the rear side of the main body case 1, as shown in FIG.

In order to reduce the exhaust noise from the exhaust port 16, an electric blower 1 is installed.
Sound absorbing materials 17 and 18 made of moltoprene are provided around the exhaust port 16 and inside the exhaust port 16. 19 is the electric motor 12
The remote control relay 20 that controls the operation of the motor 12 is a capacitor that absorbs noise generated from the commutator surface of the motor 12, and is fixed to the motor 12 with screws or the like.

A cord reel storage chamber 22 is provided below the main body case 1 and is defined by a lower partition plate 21 that partitions the electric blower storage chamber 15 .

The cord reel 23 is placed here, and the reel shaft 24
is rotatably supported. The lower end of the reel shaft 24 is
It is supported by a contact stand 25 provided on the lower inner surface of the cord reel storage chamber 22 and whose upper end is provided on the partition plate 21 . The lower plate 26 of the cord reel 23 has teeth 27 on its outer periphery.

The face gear 28 that engages with the teeth 27 is rotatably supported by a support plate 30 provided on the front wall 29 of the main body case 1 . A drive clutch plate 31 is screwed to the face gear 28 at a position on the front surface of the main body case 1 . This drive clutch plate 31 is provided with an engaging pawl 32, and an engaging pawl 69 engages with this engaging pawl 32. 33 is provided at the top of the main body case,
It is also an outlet for drawing power, and is used, for example, to connect a plug for a power brush.

34 is a handle, and a dust indicator 35 is provided above the handle.

36 is a cover of the dust indicator 35.

The dust indicator 35 is communicated with a suction chamber 38 of the electric blower storage chamber 15 via a communication pipe 37.

39 is a hole through which the suction chamber 38 and the communication pipe 37 communicate.

The suction port 40 of the suction chamber 38 is provided approximately at the center of the front surface of the main body case 1, and a lattice is provided here. The main body case 1 is provided with wheels 41 for running.

A front cover 42 is attached to the front surface of the dust case 2 with screws, and has a hose insertion port 43 that projects inward.

The tip of this hose insertion port 43 is attached to the suction opening of the dust case 2 via a backing 44.
A check valve 45 is integrally formed in the backing 44 . 46 is a handle for the dust case forming the front cover 42.

47 is a caster provided on the lower surface of the dust case 2.

A dust collection and removal device is detachably attached to the dust case 2.

This dust collection and removal device includes a net filter frame 48,
And they are assembled in a net filter frame 48.
The net filter frame 48 made of ABS resin has a square shape, and is provided with a fine dust outlet 49 on its lower surface and a net portion 51 for filtering coarse dust on its front surface.

This net portion 51 is integrally attached to the net filter frame 48, and is formed by knitting nylon thread. The dust collecting and removing device including the net filter frame 48 is taken in and out from the rear opening of the dust case 2.

A recess 89 is formed in the lower part of the net filter storage section 53 of the dust case 2. The recess 89 has a step 88 that abuts against the wall surface 54 forming the fine dust outlet 49 so as to seal at least coarse dust. 56 is a main filter for fine dust made of a nonwoven fabric formed into a wave shape.

This main filter 56 has a frame portion 57 . The outer periphery of this frame portion 57 is joined to the net filter frame 48 via a filter backing 58. This filter backing 58 is connected to the joint surface between the main case 1 and the dust case 2, and between the net filter frame 48 and the main filter 5.
6 and the dust case 2.

Locking protrusions 59 are provided on the upper and lower sides of the frame portion 57 of the main filter 56. engages the hole 60, thereby causing the main filter 5 to
6 is held within the net filter frame 48.

61 is a support plate of the dust removal device, and the filter backing 5
8 and attached to the frame 57 of the main filter 56.

At the center of this support plate 61, a holding base 63 holding a dust remover 62 formed of an elastic wire (piano wire) is rotatably supported. A disc 64 is screwed to this holding base 63. A hole 87 into which a finger can be inserted is provided in the disc 64, and this hole 87 also serves as a handle for dust removal operation. A support shaft 65 is integrally formed on the lower side of the support plate 61.

A drum 66 and a spring 67 are attached to the support shaft 65 . The drum 66 has teeth 68 on its outer periphery.
Further, an engaging pawl 69 for a passive clutch is formed on the outer end surface. This passive clutch engagement claw 69 engages with the engagement claw 32 of the drive clutch plate 31 by attaching the dust case 2 to the main body case 1. The spring 67 is
The engaging claws 32, 69 are arranged so that the drums 6, 6 can slide.
This is provided to ensure smooth engagement operation. A toothed portion 70 is provided on the outer periphery of the disc 64.

Since this tooth portion 70 engages with the tooth portion 68 of the drum 66, it applies rotational force to the dust remover 62 via the rotary face gear 28 of the cord reel 23, the drive clutch plate 31, the drum 66, and the disk 64. communicated. As shown in FIG. 4, 111 and 112 are a main through hole and an auxiliary through hole for ventilation provided in the support plate 61, and are provided on the surface facing the hole 87 provided in the disc 64. At least the main through hole 111 is provided facing the frame portion 113 on the outer periphery of the disk 64 and the gear 70 to improve safety during dust removal operations and improve appearance.

Above the main filter 56, as shown in FIGS. 1 and 3, there is a net filter frame 48 which becomes the primary filter side.
A dust removal drive device is provided.

The dust removal cam 71 of this dust removal drive device is rotatably supported by a bearing 72 integrally formed on the upper side of the frame portion 57.
A dust removal seal backing 73 is fitted around the outer periphery of the bearing 72. A support shaft 74 is attached to the back surface of the dust removal cam 71 with a screw. Dust removal cam 71 and support shaft 7
4, the rotational direction is securely fixed by the concave and convex engagement. A drive coupling 75 and a passive coupling 76 are supported on the outer periphery of the support shaft 74. The drive coupling 75 is rotatable, while the passive coupling 76 is slidable in the axial direction but remains fixed in the rotational direction. A flange 77 is attached to the outer end of the support shaft 74.
is provided. Since a spring 78 is provided on the support shaft 74 between the flange 77 and the passive coupling 76, the passive coupling 76 receives a force pressing against the drive coupling 75. Drive coupling 75
The outer periphery of the disc 64 is supported by an auxiliary bearing 79, and the outer periphery of the large diameter portion thereof is provided with a toothed portion 80 that engages with the toothed portion 70 of the disk 64.
is formed. The driving coupling 75 and the passive coupling 76 are provided with engaging pawls 81 and 82, and since the pawls 81 and 82 have a vertical surface and an inclined surface, rotation in only one direction is transmitted.

Therefore, during rotation in the non-transmission direction, the passive coupling 76 escapes against the spring 78. For this reason, only the drive coupling 75 rotated by the disk 64 idles. The net dust remover 83 is formed of a leaf spring.

This net dust remover 83 has one end fixed to the non-ventilated portion 102 of the central support 99 of the filter frame 48, and the other end free. A free end of the net dust remover 83 is positioned opposite to the dust removal cam 71. A transducer 84 integrally formed is provided on the upper inner surface of the front surface of the net filter frame 48 . This receiver 84 is
It is positioned near the bottom of the dust removal cam 71. For this reason, the rotation of the dust removal cam 71 causes the net dust removal element 83 to be repelled and vibrate. During this vibration, the net dust remover 8
3 collides with the receiver 84 and generates impact vibration. next,
To explain the current plate in detail in this embodiment, as shown in FIG. 3, 85 forms a main detour passage 85a from the net filter 51 to the wavy main filter 56 at the upper rear part of the net filter frame 48. It is a current plate.

This current plate 85 is non-ventilated and is fixed to the net filter frame 48 with screws. 91 is a member that fixes the net dust remover 83, and is connected to the rectifying plate 85 and the hinge part 10.
It is integrally formed through 3.

The current plate 85 is placed between the net portion 51 on the front side of the net filter frame 48 and the main filter 56. The wave-shaped main filter 56 is placed so that the undulations are in the vertical direction, and the slits 86 of the rectifying plate 85 are arranged vertically in parallel on the front surface of the trough portion of the main filter 56. As shown in FIG. 3, a plurality of vertical slits 86 are formed on the lower side of the current plate 85. As shown in FIG.

This slit 86 is provided at a position facing the lower part of the wavy main filter 56 and facing the trough of the wave. A main bypass passage 85a formed above the rectifying plate 85 is located behind the receiver 84. For this reason, the airflow flowing through the main bypass passage makes it difficult for fine dust to adhere to the area around the dust removal cam, and there are many slits provided at the bottom of the rectifier plate below the main filter, where fine dust adheres and is difficult to peel off. Since the airflow is ejected from the main filter towards the troughs, it prevents fine dust from adhering to it.

Reference numeral 92 denotes a vibration transmitting body, which includes a main vibration transmitting body 93 having an inverted U shape as shown in FIG.
Consisting of

The vibration transmitter 92 is integrally formed of ABS resin when the net filter frame 48 is molded, and is integrated with the pendulum 84.
There is a device that efficiently transmits the impact vibration applied to the net filter 51 to the entire surface of the net filter 51. 96 and 97 are vibration transmitting bodies 9
The weight part provided at the tip of 2 increases the vibration effect by the weight action, and also serves as a receiving part for the product ejection pin during molding work, and by the gas escape effect from the ejection pin part, the vibration transmitter There is something that improves the moldability of 92.

Reference numeral 98 denotes a receiving hole for an extrusion pin provided on the vibration transmitting body 92. In order to prevent the vibration transmission effect of the vibration transmission body 92 from being inhibited, the vibration transmission body 92 is provided at a straight portion or a uniformly changing portion, avoiding curved portions of the vibration transmission body 92.

114, as shown in FIG. 3, is the terminal end of a rib provided on the back surface of the vibration transmitting body 92, excluding the net. The deflection of the dust particles 83 is regulated to prevent the net dust remover 83 from being subjected to excessive force and being deformed or damaged when the net filter 48 is taken out.

Reference numeral 99 denotes a central support body, and as shown in FIG. 2, a pendulum receiver 84 and a non-ventilation portion 102 are provided on this central support body 99.

115 is a fine dust outlet, which is close to the fine dust outlet 49;
It is provided in the lower part of the net filter frame 48 to communicate with a space defined by the net filter 51 and the rectifying plate 85, and discharges fine dust accumulated in the space.

A fine dust storage chamber B is provided below the main filter 56 in the space of the dust case 2 defined by the rectifying plate 85 and the frame portion 57 of the main filter 56.

Reference numeral 116 denotes a coarse dust guide rib, which is provided to protrude horizontally from the inner wall of the dust case 2, and faces the net portion 51 of the net filter frame 48 with a slight distance therebetween.

Further, the position is near the receiver 84, which is the dust removal function part of the net filter, and near the main bypass passage above the rectifier plate 85. [Operation] Next, the operation based on the above embodiment will be described.

When the electric blower 10 is operated, an airflow containing dust passes through the suction hose and flows into the coarse dust storage chamber A of the dust case 2 from the hose insertion port 43.

Upon inflow, the check valve 45 is opened by the airflow. However, when the electric blower 10 is stopped, the airflow disappears and the check valve 45 is automatically closed, so that the dust from inside the coarse dust storage chamber A does not return to the hose insertion port 43 side. The coarse dust enters the coarse dust storage chamber A along with the airflow, is captured by the net 51, and accumulates in the coarse dust storage chamber A.

Only the air current containing fine dust passes through the net 51 and flows to the main filter 56 side, the fine dust is captured by the main filter 56, and a part of the fine dust accumulates in the fine dust storage chamber B.

The airflow that has passed through the main filter 56 enters the suction chamber 38 from the suction port 40 and enters the electric blower 10 and the sound absorbing material 18.
It passes through and is exhausted from the exhaust port 16.

In addition to the above series of operations, the rectifying plate will be described in more detail.

The airflow containing fine dust that has passed through the net portion 51 is passed through the rectifying plate 85.
Main detour passage 85a and auxiliary passage 8 located on the upper end side
6 and flows to the main filter 56 side.

This airflow is caused by the negative pressure acting uniformly on the entire surface of the main filter 56, but if a non-ventilated part of the rectifying plate 85 is placed opposite the center of the main filter 56, Therefore, the airflow from the upper main detour passage 85a descends in large quantities from above to the bottom, and the airflow ejected from the slit 86 flows upward along the troughs of the main filter, reaching the center of the filter. There is a flow in the opposite direction. For this reason, fine dust will concentrate and adhere to the center of the main filter 56. However, the dust remover 62 is
The main filter 56 is strongly vibrated at the back of the central part of the main filter 56.
It is possible to effectively remove dust adhering to the central part of the screen. Since the main filter 56 has a corrugated shape, it is more effective to collect the adhesion of dust in areas where vibrations for dust removal are strong to eliminate clogging. Next, we will discuss how to remove coarse dust that adheres to the net filter. The airflow containing dust is sucked through the absorption port, enters the dust case 2, and hits the net portion 51 of the net filter frame 48.

The deflection of the airflow that hits the dust case 2 is promoted by the action of the rectifier plate 85 arranged in parallel with an optimum distance between the net filter frame 48 and the main filter 56.
After colliding with the bottom wall and settling some of the coarse dust due to the inertial dust collection effect, it is rotated from the front and side downwards to the front and side upwards. Here, the optimal net filter frame 4
8 and the rectifying plate 85 is approximately 10 TrrIn. The apparent ventilation resistance of the net filter 51, which is made below this value, increases and the air current flows over the surface, resulting in a greater cleaning effect due to blowing, but pressure loss increases. Also,
If the air flow exceeds this value, there will be no airflow flowing parallel to the net portion 51 of the net filter frame 48, and only airflow will flow in the vertical direction, and the cleaning effect due to blowing will be lost. The swirled airflow is directed to the net filter frame 48 facing the main detour passage 85a above the baffle plate 85.
It passes through the net portion 51 and flows into the main filter 56 from the main detour passage 85a.

The slit 86 is provided in the lower part of the rectifier plate 85 directly and strongly hit by the airflow, facing the valley of the main filter 56, and is formed in the form of a slit with both sides low and the center high. Main detour passage 8
5 a is provided above the current plate 85 at a position facing the dust removal cam 71 . In this case, the airflow from the main detour passage 85a is concentrated toward the main filter 56, thereby blowing away and preventing dust from adhering to the dust removal cam portion. The auxiliary passage 86 prevents a large amount of dust from accumulating and compacting below the main filter 56 due to the cleaning action of the main filter 56, and concentrates the dust in the area where the dust remover hits the center of the main filter 56. This has the effect of providing good dust removal performance. The airflow flowing into the main filter 56 passes between the troughs of the main filter 56 and the rectifying plate 85 and is sent to the electric blower 10 side while the main filter 56 captures fine dust. Main filter 5
At the bottom of the trough 6, a rib integrally molded with the frame 57 of the main filter is provided on the upper surface of the main filter 56 so that it is low above the airflow and thick at the bottom. Therefore, the waveform of the filter 56 appears to be shallower and wider on the downstream side, making it difficult for dust to accumulate therein. Further, due to the function of the rectifying plate 85, the upward swirling flow along the wall formed in the dust case 2 generates a local vortex at the coarse dust guiding rib 116 portion.

Coarse dust in the airflow is guided to this vortex, and the coarse dust guiding rib 11
6 Remains in the stagnation part of the airflow on the top surface, and coarse dust guide rib 116
It is established in The coarse dust guide ribs 116 fix dust to the dust case 2 when removing dust from the net filter frame 48,
By promoting relative movement with the net filter frame 48, dust removal is made more reliable. This effect is particularly noticeable when the amount of coarse dust adhering to the net filter 51 is minute and it is difficult to obtain a peeling force due to the inertial force of the dust. The dust that is collected on the coarse dust guide rib 116 and removed when a small amount is attached becomes a felt and accumulates inside the dust case 2, so it is scattered again and removed from the net filter 5.
1 can be prevented from adhering. In addition, by repeating dust suction and dust removal, the dust is sucked into the dust case 2 until it becomes empty, and the coarse dust has progressed to a state where it has adhered to a point far from the dust removal action part of the net filter frame 48, which has a weak dust removal effect.
Since the adhesion force of coarse dust is weak even if it re-attaches, there is an advantage that a uniform dust removal effect can be guaranteed over the entire surface of the net filter 51. The coarse dust guide ribs 116 are designed to securely fix coarse dust and perform efficient dust removal without disturbing the vibration of the net filter frame 48 and even when the amount of coarse dust adhering to the net filter 51 is minute. , net filter 51 and 1~3T! It is desirable that they face each other with an interval of Rm.

In addition, in order not to obstruct the swirling airflow inside the dust case and prevent the cleaning effect of the airflow inside the net filter frame 48 and the swirling movement and adhesion of coarse dust to the coarse dust guide ribs 116, it is necessary to The height of the rib from is approximately 307177! It is preferable to keep it below. In this embodiment, the cleaner body has a structure divided into two parts, the main body case 1 and the dust case 2. However, the structure is not limited to this, and the main body case 1 and the dust case 2 are integrally formed. It may be something that has become old. [Effects of the Invention] Since the present invention has the above-mentioned configuration, it has the following effects.

(b) A dust case having a suction port and housing a net filter frame is removably provided in front of the main case equipped with an electric blower, and a central support is provided in contact with the back of the net filter of the net filter frame. This is a dust removal device for a vacuum cleaner, in which a receiver is fixed to the upper part of the center support and one end of a leaf spring-shaped net dust remover is fixed to the approximate center. Strong vibrations can be applied to areas where it is likely to adhere.

(b) Since the wave-shaped main filter frame made of non-woven fabric is inserted and fixed into the net filter frame from the rear, and a dust remover is provided on the back of the main filter, the dust-containing air flows from the top and bottom toward the center. The dust remover vibrates strongly from the center back where dust tends to adhere, making it possible to effectively remove dust. (c) Waveform main filter in front of the main filter frame. Since a rectifying plate having a number of slits at the bottom corresponding to the valleys of the net filter frame is provided to cover all but the upper part of the net filter frame, the airflow containing fine dust is directed from the upper main detour passage and the slits to the main filter. Head towards the center.

Therefore, although fine dust concentrates and adheres to the central part of the main filter, the dust is effectively removed by the vibration of the dust remover from the back of the main filter.

In addition, the slits mentioned above are provided in large numbers in correspondence with the valleys of the main filter, so the water spouted out. The airflow rises along the troughs and has the effect of cleaning the lower part of the main filter where fine dust tends to adhere. (d) The baffle plate is provided so as to cover the net filter frame except for the upper part thereof to form a main detour passage to the main filter, and at a position facing the main detour passage and on the upstream side of the net filter. Since coarse dust guiding ribs protruding from the inside of the dust case are formed, the upward swirling flow along the wall created inside the dust case is localized at the coarse dust guiding ribs due to the function of the rectifying plate. Creates a vortex.

Coarse dust in the airflow is guided to this vortex, remains in the stagnation part of the airflow on the upper surface of the coarse dust guiding rib, and is fixed by the coarse dust guiding rib. The coarse dust guide ribs fix dust to the dust case when removing dust from the net filter frame, and promote relative movement with the net filter frame, thereby making dust removal more reliable. This effect is particularly noticeable when the amount of coarse dust adhering to the net filter is minute and it is difficult to obtain a peeling force due to the inertial force of the dust. The dust collected on the coarse dust guiding rib portion and removed when a small amount of dust is deposited becomes a felt shape and accumulates in the dust case, so that it can be prevented from being re-scattering and depositing on the net filter. In addition, by repeating dust suction and dust removal, the dust is sucked until the dust case is full, and the coarse dust advances to a point far from the dust removal action part of the net filter frame, where the dust removal effect is weak, and re-adheres. Even if it is, the adhesion of coarse dust is weak, so it has the advantage of guaranteeing a uniform dust removal effect over the entire surface of the net filter. As described above, according to the present invention, the coarse dust guide rib prevents coarse dust from rotating in the dust case on the upstream side of the net filter due to the reverse airflow caused by the rectifying plate. There is provided a dust removal device for a vacuum cleaner that can concentrate coarse dust on the dust guiding rib portion and prevent the coarse dust from re-adhering to the net filter.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the vacuum cleaner body, Fig. 2 is a perspective view of the net filter frame as seen from the outside, and Fig. 3 is a net including a rectifying plate. FIG. 4 is a perspective view of the filter frame as seen from the inside, and FIG. 4 is a perspective view of the dust case as seen from the front. 2...Dust case, 10...Electric blower, 43...Hose insertion port, 45...
Check valve, 48... Net filter frame, 51...
...net filter-56...main filter,
85... Current plate, 85a... Main bypass passage, 116... Coarse dust guide rib.

Claims (1)

[Claims] 1. A dust case having a suction port and housing a net filter frame is removably provided in front of the main case equipped with an electric blower, and a central support is provided in contact with the back surface of the net filter of the net filter frame. A receiver is fixed to the upper part of the center support, and one end of a leaf spring-shaped net dust remover is fixed to the substantially central part, and a corrugated main filter frame made of non-woven fabric is inserted from behind into the net filter frame. In a vacuum cleaner dust removal device that is inserted and fixed and has a dust remover on the back side of the main filter, the current plate has a number of slits in its lower part that correspond to the troughs of the wave-shaped main filter in front of the main filter frame. is provided to cover the net filter frame except for the upper part thereof to form a main detour passage to the main filter, and is located inside the dust case at a position facing the main detour passage and on the upstream side of the net filter. A dust removal device for a vacuum cleaner, characterized in that a coarse dust guide rib is formed that protrudes from the bottom.