CN218356026U - Air duct structure and cleaning device - Google Patents

Abstract

The utility model relates to a cleaning device technical field, concretely relates to wind channel structure and cleaning device. The air duct structure comprises an air duct shell and a partition part, the air duct shell is provided with an air duct cavity, an air inlet, an air outlet and a connecting port, and the air inlet, the air outlet and the connecting port are communicated with the air duct cavity; the partition part is connected in the air duct cavity and divides the air duct cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity is suitable for being communicated with a dust and air inlet of the dust and dirt separator and the air inlet, and the air outlet cavity is suitable for being communicated with an air outlet of the dust and dirt separator and the air outlet. The utility model provides a wind channel structure has retrencied part quantity, has reduced the cost of manufacturing, has improved production assembly efficiency, and compact structure is simple, and the wind channel resistance is little, and the reliability is high.

Description

Air duct structure and cleaning device

Technical Field

The utility model relates to a cleaning device technical field, concretely relates to wind channel structure and cleaning device.

Background

Cleaning devices such as dust collectors and mite removing instruments generally comprise structures such as a suction head unit, a separator unit and a fan unit, wherein the functional units are generally connected through independent air duct structures such as an air inlet duct and an air exhaust duct, and the connecting interfaces are sealed through sealing elements. The air duct has a large and complex structure, so that the die sinking cost is high, and the production and assembly efficiency is low; and the air duct structure has more interfaces with each functional unit, and the air duct resistance is large.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the part quantity of wind channel structure is many and complicated among the prior art to a wind channel structure and cleaning device are provided.

In order to solve the problems, the utility model provides an air duct structure, which comprises an air duct shell and a separating part, wherein the air duct shell is provided with an air duct cavity, an air inlet, an air outlet and a connecting port, the air inlet, the air outlet and the connecting port are communicated with the air duct cavity, and the connecting port is suitable for being connected with a dust-dirt separator; the partition part is connected in the air duct cavity and divides the air duct cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with a dust and air inlet of the dust and dirt separator and the air outlet, and the air outlet cavity is communicated with an air outlet of the dust and dirt separator and the air outlet.

The utility model provides a wind channel structure, partition portion integrated into one piece is in the wind channel intracavity.

In the air duct structure provided by the utility model, the separating part extends to the connecting port and separates the connecting port into a first circulation port and a second circulation port; the air inlet cavity is communicated with the dust air inlet through the first circulation port; the air outlet cavity is communicated with the air flow outlet through the second circulation opening.

The utility model provides a wind channel structure, connector department is equipped with the installation department, the installation department is suitable for and is connected with the sealing member, first circulation mouth is suitable for to pass through the sealing member with dirt gas inlet intercommunication, second circulation mouth is suitable for to pass through the sealing member with the sealed intercommunication of air current outlet.

The utility model provides an air duct structure, the installation part comprises a first installation subsection and a second installation subsection, the first installation subsection is arranged on the separation part, and the second installation subsection is arranged on the air duct shell; the sealing element comprises a first sealing part and a second sealing part, the first sealing part is connected with the first mounting branch part, and the first sealing part is a strip-shaped sealing part extending along the length direction of the partition part; the second sealing part is connected with the second mounting part, the second sealing part is an annular sealing part matched with the connecting port in shape, and two ends of the strip-shaped sealing part are respectively connected with an inner ring of the annular sealing part.

The utility model provides a wind channel structure, first installation subsection is for setting up first mounting groove on the terminal surface of partition, second installation subsection is for setting up the second mounting groove of the tip of wind channel casing, the second mounting groove be with the annular mounting groove that the shape of wind channel casing matches, the both ends of first mounting groove respectively with the annular mounting groove is located inner ring cell wall intercommunication, first sealing with second sealing integrated into one piece.

The utility model provides a wind channel structure, connector lug department still is equipped with the step groove, the step groove sets up the periphery of installation department, the step groove is used for the guiding orientation the connection of dirt separator.

The utility model provides a wind channel structure, the wind channel casing includes:

the separation part is connected in the shell body and separates the inner cavity of the shell body into a first inner cavity and a second inner cavity;

the air inlet shell extends outwards from the other end of the shell body and is integrally formed with the shell body, and the air inlet is formed in one end, far away from the shell body, of the air inlet shell; the inner cavity of the air inlet shell is communicated with the first inner cavity and forms an air inlet cavity with the first inner cavity;

the air outlet shell extends outwards from the side part of the shell body and is integrally formed with the shell body, and the air outlet is arranged at one end, far away from the shell body, of the air outlet shell; the inner cavity of the air outlet shell is communicated with the second inner cavity and forms an air outlet cavity with the second inner cavity.

The utility model provides a wind channel structure, the second circulation opening overflow sectional area and be greater than the sectional area that overflows of air-out shell, the second circulation opening with be equipped with arc transition face between the air-out shell.

The utility model also provides a cleaning device, which comprises the air duct structure, the dust separator and the fan unit; the dust and dirt separator is connected with the connecting port; and the fan unit is connected with the air outlet.

The utility model provides a cleaning device still includes the shell, be equipped with the suction inlet on the shell, wind channel structural connection is in the shell, the air intake connection is in suction inlet department.

The utility model has the advantages of it is following:

1. the utility model provides an air duct structure, which comprises an air duct shell and a separating part, wherein the air duct shell is provided with an air duct cavity, an air inlet, an air outlet and a connecting port which are communicated with the air duct cavity, and the connecting port is suitable for being connected with a dust-dirt separator; the separating part is connected in the air duct cavity and divides the air duct cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity is suitable for being communicated with a dust air inlet of the dust-dirt separator and the air inlet, and the air outlet cavity is suitable for being communicated with an airflow outlet of the dust-dirt separator and the air outlet.

The air duct shell is integrated with an air inlet cavity and an air outlet cavity through a partition part, and the air inlet cavity is used for feeding air through an air inlet and is communicated with a dust and air inlet of the dust and dirt separator; the air outlet cavity can be communicated with the fan unit through an air outlet and is communicated with an airflow outlet of the dust separator. The suction head, the dust and dirt separator, the fan unit and other functional units are connected through the integrated air duct structure, the number of parts is reduced, the production and manufacturing cost is reduced, the production and assembly efficiency is improved, and the suction head, the dust and dirt separator, the fan unit and other functional units are compact and simple in structure, small in air duct resistance and high in reliability.

2. The utility model provides a wind channel structure, partition portion integrated into one piece is in the wind channel intracavity. Simple structure, the sealing performance between air inlet chamber and the air-out chamber is good, and the one-time shaping of a set of mould of accessible, and the die sinking cost is low, and production efficiency is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic view of the air duct structure provided by the present invention;

fig. 2 shows a cross-sectional view of the air duct structure provided by the present invention;

figure 3 shows a partial schematic view of a cleaning device provided by the present invention;

fig. 4 shows a partially installed exploded view of the cleaning device provided by the present invention.

Description of the reference numerals:

1. an air duct structure; 11. an air duct housing; 111. an air inlet; 112. an air outlet; 113. a connecting port; 1131. a first circulation port; 1132. a second flow port; 12. a partition portion; 13. an air inlet cavity; 14. an air outlet cavity; 15. an installation part; 151. a first mounting subsection; 152. a second mounting section; 16. a step groove; 17. a housing body; 18. an air inlet housing; 19. an air outlet shell; 191. an arc-shaped transition surface; 2. a seal member; 21. a first seal portion; 22. a second seal portion; 3. a dust-dirt separator; 4. a fan unit; 5. a housing; 51. a suction opening.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between 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.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 4, the present embodiment provides an air duct structure 1, which includes an air duct housing 11 and a partition 12, wherein the air duct housing 11 is provided with an air duct cavity, and an air inlet 111, an air outlet 112 and a connection port 113 which are communicated with the air duct cavity, and the connection port 113 is adapted to be connected with a dust-dirt separator 3; the partition part 12 is connected in the air duct cavity, and divides the air duct cavity into an air inlet cavity 13 and an air outlet cavity 14, the air inlet cavity 13 is communicated with the dust air inlet of the dust-dirt separator 3 and the air inlet 111, and the air outlet cavity 14 is communicated with the air outlet of the dust-dirt separator 3 and the air outlet 112.

An air inlet cavity 13 and an air outlet cavity 14 are integrated on the air duct shell 11 through a partition part 12, and the air inlet cavity 13 enters air through an air inlet 111 and is communicated with a dust air inlet of the dust separator 3; the air outlet chamber 14 can communicate with the fan unit 4 via an air outlet 112 and with an air flow outlet of the dirt separator 3. The suction head, the dust and dirt separator 3, the fan unit 4 and other functional units are connected through the integrated air duct structure 1, the number of parts is reduced, the production and manufacturing cost is reduced, the production and assembly efficiency is improved, the purposes of cost reduction and efficiency improvement are achieved, and the market competitiveness of products is improved; and the structure is compact and simple, the air duct resistance is small, and the reliability is high.

In this embodiment, the partition 12 is integrally formed in the air duct cavity. Simple structure, the air inlet chamber 13 is good with the sealing performance between the air-out chamber 14, and the disposable shaping of a set of mould of accessible, and the die sinking cost is low, and production efficiency is high. Preferably, the partition 12 is a partition plate integrally formed in the air duct cavity.

As an alternative embodiment, the partition 12 may be welded into the air duct chamber. Or the air duct cavity is integrally formed with a connecting groove, and the separating part 12 is connected to the connecting groove in a sealing manner.

Further, the partition portion 12 extends to the connection port 113, and partitions the connection port 113 into a first circulation port 1131 and a second circulation port 1132; the air inlet chamber 13 is communicated with the dust and air inlet through the first circulation port 1131; the air outlet cavity 14 is communicated with the air outlet through the second through hole 1132. The first circulation port 1131 and the second circulation port 1132 may be located on the same plane, so as to be conveniently connected to the dust and dirt separator 3, and the connection port 113 may more easily perform sealing separation between the air inlet chamber 13 and the air outlet chamber 14, so as to prevent the dust and clean air from entering the connection port 113.

Further, a mounting portion 15 is disposed at the connection port 113, the mounting portion 15 is adapted to be connected to a sealing member 2, and the first circulation port 1131 is adapted to communicate with the dust and air inlet through the sealing member 2; the second flow port 1132 is adapted to be in sealed communication with the gas flow outlet via the sealing member 2.

The sealing element 2 is arranged to realize the sealing between the air inlet cavity 13 and the air outlet cavity 14, realize the sealing between the air duct structure 1 and the dust separator 3, and ensure that the air inlet cavity 13 and the air outlet cavity 14 cannot communicate with each other after the connection port 113 is connected with the dust separator 3.

Further, the mounting portion 15 includes a first mounting division 151, the first mounting division 151 being provided on the partition 12; the seal 2 includes a first seal portion 21, the first seal portion 21 is connected to the first mounting portion 151, and the first seal portion 21 is a strip seal portion extending in a longitudinal direction of the partition portion 12. The first mounting branch 151 is used to fix and seal the first sealing portion 21, preventing air leakage at the partition portion 12.

Further, the mounting portion 15 further includes a second mounting branch 152, and the second mounting branch 152 is disposed on the air duct housing 11; the sealing member 2 further includes a second sealing portion 22, the second sealing portion 22 is connected to the second mounting portion 152, the second sealing portion 22 is an annular sealing portion matching the shape of the connection port 113, and both ends of the strip-shaped sealing portion are connected to an inner ring of the annular sealing portion. The second mounting portion 152 is adapted to secure and sealingly engage the second sealing portion 22 to prevent air flow from escaping between the duct housing 11 and the dirt separator 3. The two ends of the strip-shaped sealing part are respectively connected with the inner ring of the annular sealing part, so that the air flow is prevented from overflowing from the space between the strip-shaped sealing part and the annular sealing part.

Further, the first mounting branch 151 is a first mounting groove disposed on an end surface of the partition 12, and the first mounting groove can limit and fix the first sealing portion 21, and can obtain a better sealing effect; the second mounting branch 152 is a second mounting groove arranged at the end of the air duct housing 11, the second mounting groove is an annular mounting groove matched with the shape of the air duct housing 11, and the second mounting groove can limit and fix the second sealing portion 22 and can obtain a better sealing effect; the two ends of the first mounting groove are respectively communicated with the groove wall of the annular mounting groove positioned in the inner ring, and the first sealing part 21 can be connected and sealed with the second sealing part 22 through a communication part, so that a bulge is prevented from appearing between the first sealing part 21 and the second sealing part 22. As an alternative embodiment, both ends of the first seal portion 21 may be in sealing contact with groove walls at both ends of the first mounting groove. The first sealing portion 21 and the second sealing portion 22 are integrally formed, so that the structure is simple, the forming is convenient, and the steps are simpler and more convenient in installation and disassembly. As an alternative embodiment, the first sealing portion 21 and the second sealing portion 22 may be welded.

In this embodiment, a step groove 16 is further disposed at the connection port 113, the step groove 16 is disposed at the periphery of the mounting portion 15, and the step groove 16 is used for guiding and positioning the connection of the dust-dirt separator 3, so as to ensure the connection accuracy of the dust-dirt separator 3 and enhance the connection speed.

Specifically, the air duct housing 11 includes a housing body 17, an air inlet housing 18 and an air outlet housing 19; the connecting port 113 is arranged at one end of the shell body 17, and the separating part 12 is connected in the shell body 17 and separates the inner cavity of the shell body 17 into a first inner cavity and a second inner cavity; the air inlet casing 18 extends outwards from the other end of the casing body 17 and is integrally formed with the casing body 17, and the air inlet 111 is arranged at one end, far away from the casing body 17, of the air inlet casing 18; the inner cavity of the air inlet shell 18 is communicated with the first inner cavity and forms an air inlet cavity 13 with the first inner cavity; the air outlet casing 19 extends from the side of the casing body 17 and is integrally formed with the casing body 17, and the air outlet 112 is arranged at one end of the air outlet casing 19 far away from the casing body 17; the inner cavity of the air outlet shell 19 is communicated with the second inner cavity, and forms an air outlet cavity 14 with the second inner cavity.

The shell body 17, the air inlet shell 18 and the air outlet shell 19 are integrally formed, the production and manufacturing cost is reduced, the production and assembly efficiency is improved, the structure is compact and simple, the air duct resistance is small, and the reliability is high. The arrangement of the air inlet shell 18 can also adapt to the position and the size of a suction head or a suction port 51 provided with the air duct structure 1, and the difference between the distance between the structures and the area of an overflowing section is compensated; the arrangement of the air outlet shell 19 can also adapt to the position of the fan unit 4 provided with the air duct structure 1, and the difference between the distance between the structures and the area of an overflowing section is made up; the shell body 17 can adapt to the position and the size of the dust separator 3, and make up the difference between the distance between structures and the area of the flow cross section. The connecting port 113 and the air inlet casing 18 are arranged at two ends of the casing body 17, so that the air flow containing dust can enter conveniently, and the entering resistance of the air flow containing dust is reduced. Preferably, an included angle is formed between the air inlet direction of the air inlet shell 18 and the air inlet direction of the first inner cavity of the shell body 17, and the included angle is larger than 90 degrees.

Specifically, the partition portion 12 includes two partition plates that are spaced and arranged in parallel, a groove plate is further connected to an end of the two partition plates near the connection port 113, and the two partition plates and the groove plate enclose a first installation groove. The outer peripheral wall of the shell 17 at the end of the connection port 113 is provided with a flange, and the flange and the shell 17 enclose a second installation groove. And a reinforcing rib can be arranged between the partition plate and the shell body 17 to increase the strength of the partition plate. Or, a guide plate may be further disposed between the partition plate and the shell body 17, the guide plate is disposed in the first inner cavity and configured to guide flow to the dust and air inlet, and the guide plate is matched with the shell body 17 and the partition plate to separate a first circulation port 1131 matched with the dust and air inlet.

Further, the area of the flow cross section of the second flow opening 1132 is larger than the area of the flow cross section of the air outlet casing 19, and an arc-shaped transition surface 191 is arranged between the second flow opening 1132 and the air outlet casing 19. The arc transition surface 191 can realize smooth transition, reduce wind resistance and improve efficiency.

In the present embodiment, a cleaning apparatus is further provided, which includes the above-mentioned air duct structure 1, the dirt separator 3 and the fan unit 4, the dirt separator 3 is connected to the connection port 113, the first through opening 1131 is adapted to communicate with a dust air inlet of the dirt separator 3, and the second through opening 1132 is adapted to communicate with an air outlet of the dirt separator 3; the fan unit 4 is connected with the air outlet 112; the air inlet 111 may be a suction head of the cleaning device or may be connected to the suction head.

Compared with the prior art that the suction head, the fan unit 4 and the dust separator 3 are connected by the independent air duct structure 1, the cleaning device in the embodiment realizes the connection among the suction head, the dust separator 3, the fan unit 4 and other functional units by the integrated air duct structure 1, simplifies the number of parts, reduces the production and manufacturing cost, improves the production and assembly efficiency, achieves the purposes of cost reduction and efficiency improvement, and improves the market competitiveness of products; and the structure is compact and simple, the air duct resistance is small, and the reliability is high.

The cleaning device provided by the embodiment further comprises a housing 5, a suction opening 51 is arranged on the housing 5, the air duct structure 1 is connected in the housing 5, and the air inlet 111 is connected at the suction opening 51. The suction opening 51 is typically provided at the bottom of the housing 5, and the duct structure 1 can suck dust through the air inlet 111 and the suction opening 51 by the fan unit 4 and the dust separator 3.

Further, the cleaning device is a mite killing instrument.

As an alternative embodiment, the cleaning device may also be a vacuum cleaner.

The dust removing step of the cleaning device comprises the following steps: under the effect of fan unit 4, the wind channel intracavity of wind channel structure 1 produces the negative pressure, and dusty air current passes through air intake 111 and gets into air inlet chamber 13, and rethread first circulation port 1131 and dust and air inlet get into dirt separator 3 and separate, and the clean air after the separation gets into air outlet chamber 14 through airflow outlet and second circulation port 1132, under the effect of fan unit 4, discharges through air outlet chamber 14 and air outlet 112.

In this embodiment, the outer wall of the air inlet housing 18 is provided with a connecting arm protruding therefrom, the connecting arm is provided with a connecting hole, the connecting hole is detachably connected to the outer housing 5 through a fastening member, and the fastening member may be a fastening structure such as a screw or a bolt. The shell 5 is further provided with a limiting column in a protruding mode, and the limiting column is used for limiting the fixed shell body 17. The air inlet housing 18 may also be provided with mounting holes for the plasma generator.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. An air duct structure (1), comprising:

the air duct shell (11) is provided with an air duct cavity, an air inlet (111), an air outlet (112) and a connecting port (113), wherein the air inlet, the air outlet and the connecting port are communicated with the air duct cavity, and the connecting port (113) is suitable for being connected with the dust-dirt separator (3);

partition portion (12), connect in the wind channel intracavity, will wind channel chamber separates into air inlet chamber (13) and air-out chamber (14), air inlet chamber (13) with the dirt gas inlet of dirt separator (3) with air intake (111) intercommunication, air outlet chamber (14) with the air outlet of dirt separator (3) with air outlet (112) intercommunication.

2. Air duct structure (1) according to claim 1, characterized in that the partition (12) is integrally formed in the air duct cavity.

3. The air duct structure (1) according to claim 1 or 2, characterized in that the partition (12) extends to the connection port (113) and partitions the connection port (113) into a first circulation port (1131) and a second circulation port (1132); the air inlet cavity (13) is communicated with the dust and air inlet through the first circulating port (1131); the air outlet chamber (14) is in communication with the air flow outlet through the second flow port (1132).

4. An air channel structure (1) according to claim 3, characterized in that a mounting portion (15) is provided at the connection port (113), the mounting portion (15) is adapted to be connected with a sealing member (2), the first circulation port (1131) is adapted to communicate with the dust and air inlet through the sealing member (2), and the second circulation port (1132) is adapted to communicate with the air flow outlet through the sealing member (2) in a sealing manner.

5. The air duct structure (1) according to claim 4, wherein the mounting portion (15) comprises a first mounting portion (151) and a second mounting portion (152), the first mounting portion (151) being provided on the partition (12), the second mounting portion (152) being provided on the air duct housing (11);

the seal (2) comprises a first seal portion (21) and a second seal portion (22), the first seal portion (21) is connected with the first mounting portion (151), and the first seal portion (21) is a strip-shaped seal portion extending along the length direction of the partition portion (12); the second sealing portion (22) is connected to the second mounting portion (152), the second sealing portion (22) is an annular sealing portion matching the shape of the connection port (113), and both ends of the strip-shaped sealing portion are connected to an inner ring of the annular sealing portion.

6. The air duct structure (1) according to claim 5, wherein the first mounting portion (151) is a first mounting groove provided on an end surface of the partition (12), the second mounting portion (152) is a second mounting groove provided on an end portion of the air duct housing (11), the second mounting groove is an annular mounting groove matching the shape of the air duct housing (11), both ends of the first mounting groove are respectively communicated with a groove wall of the annular mounting groove located in an inner ring, and the first sealing portion (21) and the second sealing portion (22) are integrally formed.

7. An air duct structure (1) according to claim 6, characterized in that a step groove (16) is further provided at the connecting port (113), the step groove (16) is provided at the periphery of the mounting portion (15), and the step groove (16) is used for guiding and positioning the connection of the dust-dirt separator (3).

8. Air duct structure (1) according to any one of claims 1-2, 4-7, characterized in that the air duct housing (11) comprises:

the shell body (17) is provided with the connecting port (113) at one end, and the separating part (12) is connected in the shell body (17) and divides the inner cavity of the shell body (17) into a first inner cavity and a second inner cavity;

the air inlet shell (18) extends outwards from the other end of the shell body (17) and is integrally formed with the shell body (17), and the air inlet (111) is formed in one end, far away from the shell body (17), of the air inlet shell (18); the inner cavity of the air inlet shell (18) is communicated with the first inner cavity and forms an air inlet cavity (13) with the first inner cavity;

the air outlet shell (19) extends outwards from the side part of the shell body (17) and is integrally formed with the shell body (17), and the air outlet (112) is arranged at one end, far away from the shell body (17), of the air outlet shell (19); the inner cavity of the air outlet shell (19) is communicated with the second inner cavity and forms an air outlet cavity (14) with the second inner cavity.

9. A cleaning device, comprising:

an air duct structure (1) according to any one of claims 1-8;

a dust separator (3) connected to the connection port (113);

and the fan unit (4) is connected with the air outlet (112).

10. The cleaning apparatus according to claim 9, further comprising a housing (5), wherein a suction opening (51) is provided on the housing (5), the air duct structure (1) is connected inside the housing (5), and the air inlet (111) is connected at the suction opening (51).

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