CN217357217U

CN217357217U - Air conditioner indoor unit

Info

Publication number: CN217357217U
Application number: CN202221359305.8U
Authority: CN
Inventors: 陈正忠; 郭华锋; 申亮; 黄民柱; 李德鹏
Original assignee: Hisense Guangdong Air Conditioning Co Ltd
Current assignee: Hisense Guangdong Air Conditioning Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-09-02
Anticipated expiration: 2032-05-31

Abstract

The utility model relates to the technical field of air conditioners and discloses an air conditioner indoor unit, which comprises a casing, a filter screen, a dust collecting box, a rolling brush, a cleaning brush and a driving assembly; an air inlet is formed in the top side of the shell; the filter screen is arranged in the shell and covers the air inlet, and comprises a plurality of sub-areas; the dust collecting box is arranged in the machine shell and is positioned below the filter screen; the rolling brush is positioned between the filter screen and the dust collecting box and is rotatably arranged in the machine shell, and the rolling brush is provided with a first brush capable of brushing sundries attached to the filter screen to the dust collecting box; the cleaning brush is arranged in the dust collecting box and is used for brushing sundries attached to the rolling brush to the dust collecting box, and the cleaning brush is provided with a second brush inserted into the rolling brush. The utility model discloses an indoor set of air conditioning is under the effect of round brush and clearance brush, and the back is brushed away to the debris of round brush on with the filter screen, and the debris that adhere to on the round brush can be brushed away to the dust collecting box in by the clearance brush, promptly, on the round brush adnexed debris can not get back to the filter screen again, has guaranteed the self-cleaning effect of filter screen.

Description

Air conditioner indoor unit

Technical Field

The utility model relates to an air conditioning technology field especially relates to an indoor unit of air conditioner.

Background

The indoor unit of the air conditioner is used as a part of an air conditioning system and is arranged indoors and used for exchanging heat with indoor air so as to increase or decrease the indoor temperature.

The air-conditioning indoor unit is provided with an air inlet and an air outlet, wherein the air inlet is provided with a filter screen to filter air entering the air-conditioning indoor unit and prevent impurities such as dust and the like from entering the air-conditioning indoor unit; after the air conditioner is used for a period of time, impurities such as dust and the like attached to the filter screen are too much, so that partial filter holes in the filter screen are blocked, the air intake is reduced, and the refrigeration or heating efficiency of the air conditioner is influenced. At present, in order to keep the air conditioner running efficiently, a rolling brush is arranged in an indoor unit of the air conditioner, sundries attached to a filter screen are brushed away into a dust collecting box by the rolling brush, and the dust collecting box is cleaned regularly.

However, the foreign materials brushed off from the filter net are easily attached to the roller brush, and the foreign materials attached to the roller brush are easily reattached to the filter net along with the movement of the roller brush, thereby deteriorating the self-cleaning effect of the filter net.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: provided is an air-conditioning indoor unit capable of preventing sundries attached to a roller brush from returning to a filter screen again.

In order to achieve the above object, the utility model provides an indoor unit of air conditioner, include:

the air conditioner comprises a shell, wherein an air inlet is formed in the top side of the shell;

the filter screen is arranged in the shell and covers the air inlet, and comprises a plurality of sub-areas;

the dust collecting box is arranged in the machine shell and is positioned below the filter screen;

the rolling brush is positioned between the filter screen and the dust collection box and is rotatably arranged in the machine shell, and the rolling brush is provided with a first brush used for brushing sundries attached to the filter screen to the inside of the dust collection box;

the cleaning brush is arranged in the dust collecting box and used for brushing sundries attached to the rolling brush to the dust collecting box, and the cleaning brush is provided with a second brush inserted into the rolling brush; and

the driving assembly is used for driving the filter screen to move relative to the rolling brush, so that the rolling brush is sequentially contacted with each subarea and cleans each subarea.

In some embodiments, the roll brush and the cleaning brush extend in left and right directions, respectively, in which a distribution density of the first fur brush is lower than a distribution density of the second fur brush.

In some embodiments, the second brush has a hardness greater than a hardness of the first brush.

In some embodiments, the air conditioning indoor unit further includes:

the dust falling box is positioned below the dust collecting box; the front side of the shell is provided with an insertion slot, and the ash falling box is inserted into the insertion slot and is detachably connected to the shell; the bottom of the dust collecting box is provided with a dust falling port communicated to the dust falling box; and

the poking piece is arranged in the dust collecting box in a sliding mode and used for cleaning sundries in the dust collecting box to the dust falling port.

In some embodiments, the number of the filter screens is multiple, the multiple filter screens are respectively arranged at left and right intervals, and the dust collecting box extends left and right and is respectively positioned below the multiple filter screens.

In some embodiments, the dust falling opening is formed in the middle of the dust collecting box, and the number of the poking sheets is at least two.

In some embodiments, the slot has a first side wall and a second side wall spaced apart from each other in the left-right direction, the first side wall is provided with a first slot, and the second side wall is provided with a second slot; the ash falling box is provided with a first clamping block and a second clamping block which are arranged at intervals in the left-right direction, the first clamping block is inserted into the first clamping groove, and the second clamping block is inserted into the second clamping groove.

In some embodiments, a dust collection assembly is further included; the dust collecting component comprises a sliding seat, a shifting piece and a holding seat; the sliding seat is arranged in the dust collecting box in a sliding manner and can be switched between a first position and a second position which are arranged at left and right intervals in a sliding manner; the holding seat is arranged at the front side of the dust collecting box in a sliding way and is provided with a connecting part which is rotationally connected with the shifting sheet; the shifting piece is rotatably connected to the sliding seat and can rotate and switch between a first angle and a second angle around a rotating shaft extending forwards and backwards; when the shifting piece is positioned at the first angle, the shifting piece is transversely blocked in the dust collecting box and is abutted against the bottom wall of the dust collecting box; when the shifting piece is positioned at the second angle, the shifting piece is upwards recovered to avoid the bottom space of the dust collection box; the holding seat slides to drive the shifting piece to rotate to a first angle or a second angle.

In some embodiments, the pick is provided with a notch recessed from front to back, and the connecting portion is a protrusion penetrating into the notch.

In some embodiments, the holding base is provided with a sliding groove, the opening of the sliding groove faces downwards, and the holding base is clamped on the side wall of the dust collection box through the sliding groove so as to be slidably arranged on the outer side of the dust collection box.

The embodiment of the utility model provides an indoor unit of air conditioner compares with prior art, and its beneficial effect lies in:

the utility model provides an air-conditioning indoor unit, after working for a period of time, the filter screen is attached with more sundries, and then the air-conditioning indoor unit enters into the self-cleaning process; from cleaning the in-process, the filter screen removes relative round brush to make the first brush of round brush can respectively with each subregion contact and clean each subregion, simultaneously, the round brush is rotatory, will attach to the debris brush on the filter screen and remove to the dust arrester box in, during, have some debris can attach to on the first brush of round brush, at this moment, under the second brush effect of clearance brush, adnexed debris will be brushed to the dust arrester box on the first brush, from this first brush can contact and clear up the filter screen under the condition that does not attach to debris.

Based on above-mentioned working process, the utility model discloses an indoor set of air conditioner is under the effect of round brush and clearance brush, and the back is brushed away to the debris on the filter screen to the round brush, and the debris that adhere to on the round brush can be brushed away to the dust collecting box in by the clearance brush, promptly, on the round brush adnexed debris can not get back to the filter screen again, has guaranteed the self-cleaning effect of filter screen.

Drawings

Fig. 1 is an overall structure diagram of an air-conditioning indoor unit according to an embodiment of the present invention.

Fig. 2 is a structure view of a casing of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 3 is an enlarged view of a in fig. 2.

Fig. 4 is a structure diagram of the filter screen, the rolling brush and the cleaning brush of the indoor unit of the air conditioner in the embodiment of the present invention.

Fig. 5 is an enlarged view of fig. 4 at B.

Fig. 6 is a structural view of a dust collecting box and a dust collecting assembly of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 7 is a structural view of a dust collecting assembly of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 8 is a front view of a dust collecting assembly of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 9 is a side view of a dust collecting assembly of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 10 is a structural view of a pick and a sliding seat in a dust collecting assembly of an indoor unit of an air conditioner according to an embodiment of the present invention.

In the figure, 100, a housing; 110. an air inlet; 120. a slot; 121. a first side wall; 122. a second side wall; 123. a first card slot; 124. a second card slot;

200. filtering with a screen;

300. rolling and brushing; 310. a first brush;

400. a dust collecting box; 410. a dust falling port;

500. a shifting sheet; 510. a notch;

600. a dust falling box;

700. a sliding seat; 710. a limiting block;

800. a holding seat; 810. a connecting portion;

900. cleaning a brush; 910. a second brush.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "left and right", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the field of air conditioning, a heat exchanger is arranged in an indoor unit of an air conditioner, the indoor unit is arranged indoors and heats or cools indoor air through the built-in heat exchanger to achieve the heating or cooling effect, generally, the indoor unit comprises a casing 100, a heat exchanger arranged in the casing 100 and connected with an outdoor unit of the air conditioner, and a fan used for sucking and pumping the indoor air, wherein when the indoor unit works, the fan rotates to suck the indoor air from an air inlet 110 on the casing 100, so that the indoor air is pumped out from an air outlet on the casing 100 after passing through the heat exchanger to exchange heat with the heat exchanger.

As shown in fig. 1 to 10, an indoor unit of an air conditioner according to an embodiment of the present invention includes a casing 100, a filter screen 200, a dust collecting box 400, a roller brush 300, a cleaning brush 900, and a driving assembly; an air inlet 110 is formed on the top side of the casing 100; the filter screen 200 is disposed in the casing 100 and covers the air inlet 110, and the filter screen 200 includes a plurality of sub-areas; the dust collecting box 400 is arranged in the machine case 100 and below the filter screen 200; the rolling brush 300 is positioned between the filter screen 200 and the dust collection box 400 and is rotatably installed in the machine case 100, and the rolling brush 300 is provided with a first brush 310 which can brush out the sundries attached to the filter screen 200 into the dust collection box 400; the cleaning brush 900 is arranged in the dust collection box 400 and is used for brushing out sundries attached to the rolling brush 300 into the dust collection box 400, and the cleaning brush 900 is provided with a second brush 910 inserted into the rolling brush 300; the driving assembly is used for driving the filter screen 200 to move relative to the roller brush 300, so that the roller brush 300 is sequentially contacted with each subarea and cleans each subarea.

After the indoor unit of the air conditioner provided by the embodiment works for a period of time, the filter screen 200 is attached with more sundries, and at the moment, the indoor unit of the air conditioner enters a self-cleaning process; in the self-cleaning process, the filter screen 200 moves relative to the roller brush 300, so that the first brush 310 of the roller brush 300 can contact with and clean each sub-area, and meanwhile, the roller brush 300 rotates to brush the sundries attached to the filter screen 200 into the dust collecting box 400, and during the period, part of the sundries will be attached to the first brush 310 of the roller brush 300, at this time, the sundries attached to the first brush 310 will be brushed into the dust collecting box 400 under the action of the second brush 910 of the cleaning brush 900, so that the first brush 310 can contact and clean the filter screen 200 without attaching the sundries.

Based on the above working process, in the air conditioning indoor unit of the embodiment, under the action of the rolling brush 300 and the cleaning brush 900, after the rolling brush 300 brushes the sundries on the filter screen 200, the sundries attached to the rolling brush 300 can be brushed to the dust collecting box 400 by the cleaning brush 900, that is, the sundries attached to the rolling brush 300 cannot return to the filter screen 200 again, so that the self-cleaning effect of the filter screen 200 is ensured.

In some embodiments, referring to fig. 1 to 10, the rolling brush 300 and the cleaning brush 900 extend in the left-right direction, respectively, in which the first brush 310 is distributed at a lower density than the second brush 910. In this embodiment, since the distribution density of the first brush 310 is lower than that of the second brush 910, the second brush 910 can brush all the first brushes 310, and the impurities attached to the first brush 310 can be prevented from being returned to the filter screen 200 as much as possible.

In some embodiments, referring to fig. 1 to 10, the hardness of the second brush 910 is greater than that of the first brush 310, and this embodiment can ensure the cleaning effect of the second brush 910 on the first brush 310.

In some embodiments, referring to fig. 1 to 10, the indoor unit of an air conditioner further includes an ash dropping box 600 and a pull tab 500; the dust falling box 600 is positioned below the dust collecting box 400; wherein, the front side of the casing 100 is provided with an insertion slot 120, and the ash dropping box 600 is inserted into the insertion slot 120 and detachably connected to the casing 100; the bottom of the dust collecting box 400 is provided with a dust falling port 410 communicated with the dust falling box 600; the pick-up 500 is slidably disposed in the dust collecting box 400 and can clean the impurities in the dust collecting box 400 to the dust falling port 410. In the embodiment, after the dust collection box is used for a period of time, a user can drive the poking piece 500 to move in the dust collection box 400 to clean the sundries in the dust collection box 400 to the dust falling opening 410, so that the sundries in the dust collection box 400 can fall from the dust falling opening 410 and be concentrated in the dust falling box 600, and at the moment, the user can take the dust falling box 600 out of the slot 120 and clean the dust falling box 600, so that the cleaning and maintenance of the indoor unit of the air conditioner can be completed, the disassembly and cleaning are simple and quick, and the cleaning and maintenance of the indoor unit of the air conditioner are convenient. The arrangement of the rolling brush 300 and the cleaning brush 900 is combined, so that the impurities on the filter screen 200 can be thoroughly collected in the ash falling box 600, and the cleaning effect on the filter screen 200 is improved.

In some embodiments, referring to fig. 1 to 10, the number of the filter screens 200 is plural, the plurality of filter screens 200 are respectively arranged at left and right intervals, and the dust collecting box 400 extends left and right and is respectively located below the plurality of filter screens 200. In this embodiment, the arrangement of the plurality of filter screens 200 increases the air inlet area at the air inlet 110, thereby improving the cooling or heating effect of the indoor unit of the air conditioner; meanwhile, the dust collecting box 400 can collect sundries attached to the plurality of filter screens 200 at the same time, and the utilization efficiency of the dust collecting box 400 is improved.

In some embodiments, referring to fig. 1 to 10, the dust falling opening 410 is opened in the middle of the dust box 400, and the number of the pick-up 500 is at least two. In this embodiment, the pick 500 moves from the left and right sides of the dust collecting box 400 to the middle to drive the sundries to be concentrated in the middle of the dust collecting box 400 and drop through the dust dropping port 410 in the middle, the stroke of the pick 500 is short, and it can be ensured that the sundries are not stacked too much due to the too long stroke to cause the movement of the pick 500 to receive a large resistance.

In some embodiments, referring to fig. 1 to 10, the slot 120 has a first sidewall 121 and a second sidewall 122 spaced apart from each other along the left-right direction, the first sidewall 121 has a first engaging groove 123, and the second sidewall 122 has a second engaging groove 124; the ash falling box 600 is provided with a first clamping block and a second clamping block which are arranged at intervals along the left-right direction, the first clamping block is inserted into the first clamping groove 123, and the second clamping block is inserted into the second clamping groove 124. In this embodiment, the ash dropping box 600600 is detachably mounted in the slot 120 through the cooperation of the first clamping block and the first clamping groove 123 and the cooperation of the second clamping block and the second clamping groove 124, and when the ash dropping box is detached, the first clamping block is driven to be away from the first side wall 121, and the second clamping block is driven to be away from the second side wall 122, so that the detachment can be realized, and the operation is convenient.

In some embodiments, referring to fig. 1-10, a dust collection assembly is further included; the dust collecting assembly comprises a sliding seat 700, a poking sheet 500 and a holding seat 800; the sliding seat 700 is arranged in the dust collection box 400 in a sliding way and can be switched between a first position and a second position which are arranged at intervals left and right; the holding base 800 is arranged at the front side of the dust collecting box 400 in a sliding way and is provided with a connecting part 810 which is rotationally connected with the shifting piece 500; wherein, the plectrum 500 is rotatably connected on the sliding seat 700 and can be rotationally switched between a first angle and a second angle around a rotating shaft extending back and forth; when the shifting piece 500 is at the first angle, the shifting piece 500 is transversely blocked in the dust collection box 400, and the shifting piece 500 abuts against the bottom wall of the dust collection box 400; when the poking piece 500 is at the second angle, the poking piece 500 is upwards recovered to avoid the bottom space of the dust collection box 400; the grip 800 can slide to drive the pick 500 to rotate to a first angle or a second angle.

In this embodiment, the handle 800 drives the shifting piece 500 to rotate to a first angle, and the shifting piece 500 drives the sliding seat 700 to slide from a first position to a second position, so that the shifting piece 500 laterally sealed in the dust collecting box 400 cleans and concentrates the impurities in the dust collecting box 400 to the second position; then, the pulling piece 500 is driven to rotate to a second angle through the holding part, and the sliding seat 700 is driven to slide from the second position to the first position through the pulling piece 500, at the moment, the pulling piece 500 is upwards recovered, and the sundries at the bottom of the dust collecting box 400 cannot be brought back to the first position; therefore, the poking piece 500 is driven to move repeatedly, so that the sundries in the dust collection box 400 are collected to the second position, and when the dust collection box 400 is cleaned, the dust collection box 400 is taken out, and the sundries collected to the second position are cleaned. In this embodiment, when the arrangement of the rolling brush 300, the cleaning brush 900 and the dust falling box 600 is combined, the dust falling port 410 is opened at the second position, so that the sundries brushed off by the rolling brush 300 and the cleaning brush 900 can be effectively concentrated at the second position in the dust collecting box 400, and the sundries can fall into the dust falling box 600 through concentration, thereby improving the convenience of cleaning the sundries.

In some embodiments, referring to fig. 1 to 10, a notch 510 is formed on the pick 500, and the connecting portion 810 is a protrusion penetrating into the notch 510. In this embodiment, the connection between the pick 500 and the grip holder 800 is realized by the provision of the protrusion and the notch 510.

In some embodiments, referring to fig. 1 to 10, the holding base 800 is provided with a sliding groove, the opening of the sliding groove is downward, and the holding base 800 is clamped on the sidewall of the dust collecting box 400 through the sliding groove to be slidably arranged on the outer side of the dust collecting box 400. In this embodiment, by fastening the holding base 800 on the sidewall of the dust collecting box 400, the user can directly operate the holding part to move left and right, so as to drive the shifting piece 500 to drive the sliding base 700 to move to the second position at the first angle, and drive the sliding base 700 to move to the first position at the second angle.

In some embodiments, please refer to fig. 1 to 10, a limiting block 710 is disposed on the sliding seat 700, and the limiting block 710 is located in a rotation direction of the pick 500 from the second angle to the first angle; when the pick 500 is at the first angle, the pick 500 abuts against the stopper 710. In this embodiment, the setting of the limiting block 710 can ensure that the shifting piece 500 is located at the first angle, so as to prevent the shifting piece 500 from being upwards recycled and avoiding the bottom space of the dust collection box 400, and thus, dust at the bottom of the dust collection box 400 is brought back to the first position.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An indoor unit of an air conditioner, comprising:

2. An indoor unit of an air conditioner according to claim 1, wherein the roll brush and the cleaning brush extend in left and right directions, respectively, and a distribution density of the first fur brush is lower than a distribution density of the second fur brush in the left and right directions.

3. An indoor unit of an air conditioner according to claim 1, wherein the second brush has a hardness greater than that of the first brush.

4. An indoor unit of an air conditioner according to claim 1, further comprising:

the ash falling box is positioned below the dust collecting box; the front side of the shell is provided with an insertion slot, and the ash falling box is inserted into the insertion slot and is detachably connected to the shell; the bottom of the dust collecting box is provided with a dust falling port communicated to the dust falling box; and

5. An indoor unit of an air conditioner according to claim 4, wherein the number of the filter screens is plural, the plural filter screens are provided at intervals in the left-right direction, and the dust collecting case extends in the left-right direction and is located below the plural filter screens.

6. An indoor unit of an air conditioner as claimed in claim 5, wherein the dust drop opening is opened in the middle of the dust collecting box, and the number of the pick-up is at least two.

7. An indoor unit of an air conditioner according to claim 4, wherein the insertion groove has a first side wall and a second side wall spaced apart from each other in the left-right direction, the first side wall being provided with a first engaging groove, the second side wall being provided with a second engaging groove;

the ash falling box is provided with a first clamping block and a second clamping block which are arranged at intervals in the left-right direction, the first clamping block is inserted into the first clamping groove, and the second clamping block is inserted into the second clamping groove.

8. An indoor unit of an air conditioner according to claim 4, further comprising a dust collecting assembly; the dust collecting component comprises a sliding seat, a shifting piece and a holding seat; the sliding seat is arranged in the dust collecting box in a sliding manner and can be switched between a first position and a second position which are arranged at left and right intervals in a sliding manner; the holding seat is arranged at the front side of the dust collecting box in a sliding way and is provided with a connecting part which is rotationally connected with the shifting sheet;

the shifting piece is rotatably connected to the sliding seat and can rotate and switch between a first angle and a second angle around a rotating shaft extending forwards and backwards; when the shifting piece is positioned at the first angle, the shifting piece is transversely blocked in the dust collecting box and is abutted against the bottom wall of the dust collecting box; when the shifting piece is positioned at the second angle, the shifting piece is upwards recovered to avoid the bottom space of the dust collection box; the gripping seat slides to drive the shifting piece to rotate to a first angle or a second angle.

9. An indoor unit of an air conditioner according to claim 8, wherein the pick is provided with a notch recessed from the front to the rear, and the connecting portion is a projection penetrating into the notch.

10. An indoor unit of an air conditioner as claimed in claim 9, wherein the grip holder is provided with a sliding groove having a downward opening, and the grip holder is engaged with a side wall of the dust box through the sliding groove to be slidably provided on an outer side of the dust box.