CN219962727U - Dust collection device reliable in use - Google Patents

Abstract

The utility model discloses a dust collection device reliable in use, which belongs to the technical field of cleaning equipment and comprises a host machine and a cleaning piece, wherein the host machine is provided with a dust inlet pipe, the cleaning piece is connected with the dust inlet pipe through the dust inlet pipe, metal joints are arranged at two ends of the dust inlet pipe, the metal joints are provided with conical inner surfaces which enclose to form connecting holes, the dust inlet pipe and the cleaning piece are respectively provided with a plastic joint, the outer wall of the plastic joint is provided with a conical outer surface matched with the conical inner surface, and the metal joints of the dust inlet pipe are matched with the conical outer surface through the conical inner surface to realize interference fit of the connecting holes and the plastic joints. Utilize the interference fit between metal joint and the plastic joint of micro deformation realization, can realize through grafting cooperation that dust absorption pipe both ends respectively with clean piece, advance the detachable fixed connection of dirt pipe, rationally reduce the dismouting degree of difficulty in the time of guaranteeing structural stability.

Description

Dust collection device reliable in use

Technical Field

The utility model relates to the technical field of cleaning equipment, in particular to a dust collection device with reliable use.

Background

In recent years, some intelligent cleaning devices are more and more widely applied to daily life of people, and various cleaning devices bring great convenience to the life of people, so that living experience of people is improved. The dust collection device is a common cleaning device, the existing dust collection device generally comprises a machine body and a dust box, a dust collection fan is arranged in the machine body, a separating piece is arranged in the dust box, the dust collection fan provides suction force when in operation to form dust collection air flow which flows through the dust box from outside to inside, dirt such as dust and hair outside flows into the dust box along with the dust collection air flow and realizes air-dirt separation under the action of the separating piece, the dirt falls into the dust box, and the dust collection air flow is discharged after flowing through the dust collection fan. In order to expand the cleaning range of the dust suction device, some dust suction devices are provided with a working head and a connecting pipe, the working head is detachably connected with the dust box through the connecting pipe, and dust suction air flow formed by suction force provided by the dust suction fan flows in from the working head and then flows to the dust box through the connecting pipe. The utility model discloses a dust box, including the dust box, work head, connecting pipe, sealing gasket, the work head is connected through screw thread cooperation structure, and the work head is connected through screw thread cooperation structure between connecting pipe and the dust box generally to realize detachable connection cooperation, realize sealing gasket through sealing gasket, the user needs the dismouting of spending more time when using, is unfavorable for improving and uses and experiences, moreover, because need process the screw thread on junction, work head, the connecting pipe of dust box, the processing degree of difficulty is great, is unfavorable for reasonable reduction in production cost.

The applicant has participated in the research and development of national space dust collector project before, invents the dust collector used for cleaning the space bin under the space bin environment, has solved the problem that the astronaut can be cleaned conveniently in the space bin too. The applicant solves the problem that a dust collection pipeline of a dust collector is inconvenient to assemble and disassemble in a space bin environment, and brings good use experience to astronauts. The problems of the prior art are combined with further researches on the problem that the dust collection pipeline is inconvenient to disassemble and assemble in the space bin environment by the applicant, so that a dust collector applied to the household environment can be expected to have better disassembling and assembling convenience, and consumers can obtain better use experience.

Disclosure of Invention

In order to solve the defects and shortcomings in the prior art, the utility model provides the dust collection device which is reliable to use, the metal connectors at the two ends of the dust collection pipe are fixedly connected with the plastic connector through the conical surface interference fit structure, the disassembly and the assembly are convenient, the structure is simple, and the processing difficulty can be reduced while the use experience of a user is improved.

In order to achieve the technical purpose, the dust collection device with reliable use comprises a machine body and a cleaning piece, wherein the machine body is provided with a dust inlet pipe, the cleaning piece is connected with the dust inlet pipe through the dust collection pipe, two ends of the dust collection pipe are provided with metal joints, the metal joints are provided with conical inner surfaces which enclose to form connecting holes, the dust inlet pipe and the cleaning piece are both provided with plastic joints, the outer wall of each plastic joint is provided with a conical outer surface matched with the conical inner surface, the metal joint at one end of the dust collection pipe is in interference fit with the plastic joint of the dust inlet pipe through the matching of the conical inner surface and the conical outer surface, and the metal joint at the other end of the dust collection pipe is in interference fit with the plastic joint of the cleaning piece through the matching of the conical inner surface and the conical outer surface.

Preferably, the axial length of the tapered outer surface is greater than the axial length of the tapered inner surface.

Preferably, the conical inner surface is provided with an anti-slip coating or a soft rubber layer or a soft rubber ring; and/or the conical outer surface is provided with an anti-slip coating or a soft rubber layer or a soft rubber ring.

Preferably, the end of the metal joint far away from the dust collection pipe is provided with a horn-shaped guiding lip edge, and the inner wall of the guiding lip edge forms a guiding conical surface for guiding the plastic joint to be inserted into the connecting hole.

Preferably, the inclination angle of the conical inner surface relative to the axis is alpha, and the inclination angle of the conical outer surface relative to the axis is beta, wherein alpha is less than or equal to beta.

Preferably, alpha is more than or equal to 1 DEG and beta is more than or equal to 5 deg.

Preferably, a friction angle with the static friction force reaching the maximum value is arranged between the conical inner surface and the conical outer surface, and alpha and beta are smaller than the friction angle.

Preferably, the tapered inner surface and the tapered outer surface are both conical surfaces.

Preferably, the machine body comprises a main machine with a dust suction fan arranged therein and a dust cup detachably assembled at the front part of the main machine, and the dust inlet pipe is arranged on the dust cup.

Preferably, the dust collection pipe is a plastic corrugated hose.

After the technical scheme is adopted, the utility model has the following advantages:

1. according to the dust collection device with reliable use, the metal connectors with the connecting holes are arranged at the two ends of the dust collection pipe, the conical inner surfaces are formed on the hole walls of the connecting holes, the plastic connectors with the conical outer surfaces are arranged on the dust inlet pipe and the cleaning piece, when the cleaning piece is connected with the dust inlet pipe of the machine body through the dust collection pipe, the plastic connectors are slightly deformed due to extrusion when being in plug-in fit with the metal connectors due to different materials, interference fit between the metal connectors and the plastic connectors can be achieved through the micro deformation, fixed plug-in connection between the plastic connectors and the metal connectors can be achieved through the interference fit, the two ends of the dust collection pipe can be respectively and fixedly connected with the cleaning piece and the dust inlet pipe in a detachable mode through the simple plug-in fit, operation when the cleaning piece is connected with the machine body through the dust collection pipe is greatly simplified, and only the metal connectors and the plastic connectors are required to be pulled away when the cleaning piece is detached, so that the structural stability is guaranteed, meanwhile, the use experience of a user is improved. In addition, through the conical surface interference fit structure, the sealing fit can be realized while the machining precision requirement of related components is reasonably reduced, and the machining difficulty is reasonably reduced, so that the production cost is properly reduced.

2. The axial length of the conical outer surface is preferably greater than that of the conical inner surface, and when the plastic joint or the metal joint is worn after long-term use, the conical outer surface and the conical inner surface can still be ensured to have enough axial matching length in matching, and structural stability and matching tightness in fixed plug connection are ensured through the conical surface matching structure.

3. The anti-slip coating or the soft adhesive layer or the soft adhesive ring can be arranged on the conical inner surface, the anti-slip coating or the soft adhesive layer or the soft adhesive ring can be arranged on the conical outer surface, and the interference fit between the conical inner surface and the conical outer surface during plug fit can be properly increased through the anti-slip coating or the soft adhesive layer or the soft adhesive ring, so that the pretightening force between the conical inner surface and the conical outer surface can be properly increased, the structural stability of fixed plug is improved, and the sealing fit of fixed plug is also improved.

4. The metal joint sets up the guide lip edge of horn mouth shape, and the inner wall along the guide lip forms the guide cone, and plastic joint can contact with the guide cone when pegging graft with the metal joint and can insert smoothly in the connecting hole of metal joint under the direction effect of guide cone, can suitably reduce the grafting cooperation degree of difficulty of plastic joint and metal joint through guide lip edge and guide cone, and the user of being convenient for carries out dismouting operation, is favorable to further improving user's use experience.

5. The inclined angle alpha of the conical inner surface relative to the axial lead is preferably smaller than or equal to the inclined angle beta of the conical outer surface relative to the axial lead, the inclined angle relation between the conical inner surface and the conical outer surface is reasonably arranged, interference conflict between the conical outer surface and the conical inner surface can be realized when the metal connector is in plug-in fit with the plastic connector, and accordingly the fixed plug-in connection between the metal connector and the plastic connector can be smoothly realized through the conical surface interference fit structure.

6. The inclination angle alpha of the conical inner surface relative to the axial lead and the inclination angle beta of the conical outer surface relative to the axial lead are smaller than the friction angle, so that the thrust action between the conical inner surface and the conical outer surface can be smaller than the maximum static friction force between the conical inner surface and the conical outer surface, the situation that the conical inner surface and the conical outer surface are separated from each other under the thrust action is avoided, the plugging stability between the metal joint and the plastic joint is ensured, the structural stability of the cleaning piece connected to the machine body through the dust collection pipe is ensured, and the use reliability is further ensured.

7. The conical inner surface and the conical outer surface are conical surfaces, so that on one hand, the conical surfaces are convenient to machine and form, on the other hand, the conical surfaces are not limited in plugging direction, and when the metal connector and the plastic connector are plugged, alignment is not needed, so that a user can plug and assemble conveniently, and the use experience of the user is improved.

8. The machine body is provided with a main machine and a dust cup, the dust inlet pipe is arranged on the dust cup, the dust suction fan in the main machine provides suction force when working, forms dust suction airflow flowing into the dust cup from the cleaning piece after flowing in through the dust suction pipe and the dust inlet pipe, external dirt flows into the dust cup along with the dust suction airflow, the dirt is filtered out and is collected in the dust cup, and the filtered dust suction airflow is discharged after flowing through the dust suction fan.

9. The dust absorption pipe adopts the bellows of plastics preferably, can suitably alleviate the weight of dust absorption pipe and reduce the manufacturing cost of dust absorption pipe, in addition, the pliability of bellows is good and the pressure resistance is good, can guarantee the structural stability of dust absorption pipe, and then can guarantee the flow stability of dust absorption air current, is favorable to guaranteeing dust absorption intensity.

Drawings

Fig. 1 is a whole machine diagram of a dust suction device according to an embodiment;

FIG. 2 is an axial cross-sectional view of a metal fitting of a suction device according to an embodiment;

figure 3 is an axial cross-sectional view of a plastic joint in a suction device according to an embodiment;

FIG. 4 is a plug-in mating diagram of a plastic connector and a metal connector in a dust collector according to an embodiment;

FIG. 5 is a schematic illustration of a single-sided force applied when a plastic connector and a metal connector are mated in a vacuum cleaner according to an embodiment;

FIG. 6 is a schematic view illustrating the force between the tapered inner surface and the tapered outer surface of a dust extraction device according to an embodiment;

FIG. 7 is an axial cross-sectional view of a metal fitting of the second embodiment;

figure 8 is an axial cross-sectional view of a plastic joint in the third embodiment of the suction device;

figure 9 is an axial cross-sectional view of a metal fitting in a fourth embodiment of the suction device;

figure 10 is an axial cross-sectional view of a plastic joint in the fifth suction device of the embodiment;

fig. 11 is an axial sectional view of a metal fitting and a partial suction pipe in a sixth suction apparatus according to the embodiment.

In the figure, 100-organism, 110-dust inlet pipe, 120-dust suction fan, 130-host computer, 140-dust cup, 141-cup, 142-bowl cover, 150-cyclone separation piece, 200-cleaning piece, 310-metal joint, 311-connecting hole, 312-conical inner surface, 313-guiding lip edge, 314-guiding conical surface, 320-dust suction pipe, 410-plastic joint, 420-conical outer surface, 510-anti-slip coating and 520-soft rubber ring.

Detailed Description

The utility model will be further described with reference to the drawings and the specific examples. It is to be understood that the terms "upper," "lower," "left," "right," "longitudinal," "transverse," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like, as used herein, are merely based on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present utility model and to simplify the description, and do not indicate or imply that the devices/elements referred to must have or be configured and operated in a particular orientation and therefore should not be construed as limiting the utility model.

Example 1

Referring to fig. 1 to 6, a reliable dust collection device according to an embodiment of the present utility model includes a machine body 100 and a cleaning member 200, wherein the machine body 100 is provided with a dust inlet pipe 110, the cleaning member 200 is connected with the dust inlet pipe 110 through a dust collection pipe 320, metal connectors 310 are disposed at two ends of the dust collection pipe 320, the metal connectors 310 are provided with tapered inner surfaces 312 enclosing to form a connection hole 311, the dust inlet pipe 110 and the cleaning member 200 are both provided with plastic connectors 410, the outer wall of the plastic connector 410 is provided with a tapered outer surface 420 matched with the tapered inner surface 312, the metal connector 310 at one end of the dust collection pipe 320 is in interference fit with the plastic connector of the dust inlet pipe 110 through the cooperation of the tapered inner surface 312 and the tapered outer surface 420, and the metal connector 310 at the other end of the dust collection pipe 320 is in interference fit with the plastic connector of the cleaning member 200 through the cooperation of the tapered inner surface 312 and the tapered outer surface 420.

Because the difference of material, plastic joint 410 all can take place the micro deformation because of the extrusion when joining in marriage with metal joint 310 grafting, utilize this micro deformation can realize the interference fit between metal joint 310 and the plastic joint 410, realize the fixed grafting of plastic joint 410 and metal joint 610 through interference fit, can realize the both ends of dust absorption pipe 320 respectively with cleaning member 200, advance the detachable fixed connection of dirt pipe 110 through simple grafting cooperation, the operation when cleaning member 200 passes through dust absorption pipe 320 to be connected in organism 100 is simplified greatly, also only need during the dismantlement with metal joint 310 with plastic joint 410 pull out can, reasonable reduction dismouting degree of difficulty in the time of guaranteeing structural stability is favorable to improving user's use experience. In addition, through the conical surface interference fit structure, the sealing fit can be realized while the machining precision requirement of related components is reasonably reduced, and the machining difficulty is reasonably reduced, so that the production cost is properly reduced.

Referring to fig. 1, the dust suction device of the present embodiment is illustrated as a hand-held dust collector, and the machine body 100 includes a main unit 130 with a dust suction fan 120 therein, and a dust cup 140 detachably mounted on the front portion of the main unit 130, and the dust inlet pipe 110 is disposed on the dust cup 140. Specifically, the dust cup 140 includes a cup body 141 and a cover 142 for covering the cup body 141, and the dust inlet pipe 110 is provided on the cover 142 and protrudes forward with respect to the dust cup 140. The dust cup 140 is provided therein with a cyclone 150 for separating dirt and gas. The dust suction fan 120 provides suction force to form dust suction air flow flowing into the dust cup 140 from the dust inlet pipe 110 when in operation, external dirt flows into the dust cup 140 along with the dust suction air flow, the cyclone separation member 150 separates the dust suction air flow, the dirt is separated and collected in the dust cup 140, and the filtered dust suction air flow flows to the dust suction fan 120 through an air flow channel and is discharged after flowing through the dust suction fan 120. It should be understood that the specific structure of the dust suction device is not limited to the hand-held dust collector described above and shown in the drawings, but may be other devices having a dust suction function, such as a self-walking cleaning robot equipped with a dust suction assembly, a hand-held floor cleaner equipped with a dirt collection assembly, or a cleaning base station equipped with a dust collection assembly and matched with the cleaning robot. It can be appreciated that the plastic connector 410 at the dust inlet pipe 110 can be integrally formed with the dust inlet pipe 110 and the cup cover 142, or can be independently formed and then fixed at the front end of the dust inlet pipe 110.

Referring to fig. 3, in this embodiment, the cleaning member 200 is a flat suction head, and a plastic joint 410 is disposed at the rear end of the cleaning member 200. It is understood that the plastic joint 410 of the cleaning member 200 may be integrally formed with the cleaning member 200, or may be independently formed and then fixed to the rear end of the cleaning member 200. It will be appreciated that the particular construction of the cleaning element 200 is not limited to the flat suction heads described above and shown in the drawings, and that other suitable cleaning elements may be used, such as roller brush cleaning heads or bristle cleaning heads.

Referring to fig. 2, one end of the metal connector 310 is fixedly sleeved with the end of the dust suction pipe 320, the connecting hole 311 is arranged at the other end of the metal connector 310, and the wall of the connecting hole 311 is a conical inner surface 312. In this embodiment, the dust suction pipe 320 is preferably a plastic corrugated pipe, one end of the metal joint 310 is fixedly sleeved on the outer periphery of the end of the corrugated pipe, the metal joint 310 is in a hollow cylinder shape, the connecting hole 311 is a conical hole, and the conical inner surface 312 is a conical surface correspondingly. It can be understood that the dust suction pipe 320 may also be another pipe body meeting the dust suction requirement, the dust suction pipe 320 may also be formed by connecting a plurality of pipe sections, and the two adjacent pipe sections may be detachably connected through a joint structure, where two joints of the joint structure may be detachably inserted and matched in a manner of matching the tapered inner surface 312 and the tapered outer surface 420 described in the embodiment.

In this embodiment, the outer wall of one end of the plastic joint 410 forms a conical outer surface 420, and the conical outer surface 420 is a conical surface. Because the conical inner surface 312 and the conical outer surface 420 are conical surfaces, on one hand, the conical surfaces are convenient to process and mold, on the other hand, the conical surfaces have no limitation on the plugging direction, and alignment is not needed during plugging, so that a user can conveniently plug and assemble, and the plugging difficulty is reduced. It will be appreciated that the specific pattern of the tapered inner surface 312 and the tapered outer surface 420 is not limited to a conical surface, and may be configured in other reasonable patterns such as an elliptical conical surface, a quadrangular conical surface, a hexagonal conical surface, and the like.

In connection with fig. 4, in order to ensure structural stability and mating tightness upon mating by the tapered face mating structure, the axial length L2 of the tapered outer surface 420 is preferably greater than the axial length L1 of the tapered inner surface 312. In the event that the plastic joint 410 or the metal joint 310 wears over extended periods of use, it is still ensured that the tapered outer surface 420 and the tapered inner surface 312 have sufficient axial mating length when mated. In this embodiment, the axial length L1 of the tapered inner surface 312 is about 30mm and the axial length L2 of the tapered outer surface 420 is about 45mm. It will be appreciated that the axial length L1 of the tapered inner surface 312 may be provided in other reasonable sizes such as 20mm, 25mm, 28mm, 32mm, 35mm, 40mm, etc., and the axial length L2 of the tapered outer surface 420 may be provided in other reasonable sizes such as 30mm, 35mm, 38mm, 42mm, 45mm, 50mm, etc. Of course, the axial length L2 of the tapered outer surface 420 and the axial length L1 of the tapered inner surface 312 may be equally long.

Referring to fig. 2 and 3, the angle of inclination of the tapered inner surface 311 with respect to the axis of the metal joint 310 is α, and the angle of inclination of the tapered outer surface 420 with respect to the axis of the plastic joint 410 is β, and α is 1 ° or more and β is or less than 5 ° in order to ensure the stability of the connection between the metal joint 310 and the plastic joint 410. In this embodiment, α is preferably slightly smaller than β, specifically, α is about 2 ° and β is about 2.2 °. It will be appreciated that α may be set to other reasonable sizes such as 1 °, 1.5 °, 1.7 °, 2.1 °, 2.5 °, 3.5 °,4 °, 4.5 °,5 °, and the like, and correspondingly β may be set to other reasonable sizes within an angle range of 1 ° to 5 °, and of course, α and β may be set equally.

Referring to fig. 5 and 6, when the plastic joint 410 is in plug-in engagement with the metal joint 310, the plastic joint 410 applies an axial force F to the metal joint 310, and the force F can be decomposed into a component force F1 perpendicular to the tapered inner surface 312 and a component force F2 parallel to the tapered inner surface 312, and a reaction force Fn of the component force F1 causes the plastic joint 410 to undergo slight deformation under the force to generate a certain pretightening force, so that the fixed plug-in engagement between the plastic joint 410 and the metal joint 310 is realized through the pretightening force.

Referring to fig. 6, after the user finishes the plugging and loosening, the acting force Fn of the metal connector 310 on the plastic connector 410 can be decomposed into a component force F3 perpendicular to the axial direction and a component force F4 parallel to the axial direction, and under the action of the component force F4, the plastic connector 410 has a movement trend of separating from the metal connector 310. Meanwhile, a static friction force Ft preventing the plastic joint 410 from separating from the metal joint 310 exists between the conical inner surface 312 and the conical outer surface 420, the static friction force Ft can be decomposed into a component force F5 vertical to the axial direction and a component force F6 parallel to the axial direction, the component force F6 is equal to the component force F4 in magnitude and opposite in direction, the movement trend of the plastic joint 410 separating from the metal joint 310 is eliminated through the static friction force Ft, so that the metal joint 310 and the plastic joint 410 can be connected in a stable and reliable manner, the structural stability of the cleaning piece 200 connected to a machine body through the dust collection pipe 320 is ensured, and the use reliability is further ensured.

When the static friction force Ft between the tapered inner surface 312 and the tapered outer surface 420 reaches a maximum value, the included angle between the component force F6 and the static friction force Ft is the friction angle. In order to ensure that the component force F4 of the reaction force Fn may be smaller than the maximum static friction force between the tapered inner surface 312 and the tapered outer surface 420, the inclination angle α of the tapered inner surface 311 and the inclination angle β of the tapered outer surface 420 are both smaller than the friction angle, so that the static friction force between the tapered inner surface 312 and the tapered outer surface 420 during the plugging engagement may be larger than the component force F4, preventing the plastic joint 410 from separating from the movement trend of the metal joint 310, and ensuring that the metal joint 310 and the plastic joint 410 may be stably plugged together.

When the cleaning member 200 is needed to assist in dust collection, the cleaning member 200 is connected to the dust inlet pipe 110 through the dust collection pipe 320, the plastic joint 410 at the rear end of the cleaning member 200 is fixedly inserted into the metal joint 310 at one end of the dust collection pipe 320, and the plastic joint 410 at the front end of the dust inlet pipe 110 is fixedly inserted into the metal joint 310 at the other end of the dust collection pipe 320. When the dust suction device works, the dust suction fan 120 provides suction force to form dust suction airflow which flows into the dust cup 140 from the cleaning member 200 through the dust suction pipe 320 and the dust inlet pipe 110, external dirt flows into the dust cup 140 along with the dust suction airflow, the cyclone separation member 150 filters the dust suction airflow, the dirt is filtered out and collected in the dust cup 140, and the filtered dust suction airflow is discharged after flowing through the dust suction fan 120.

After the use is finished, the metal connectors 310 and the plastic connectors 410 at the two ends of the dust collection pipe 320 are pulled out, and then the dust cup 140 is cleaned.

Example two

Referring to fig. 7, in this embodiment, in order to improve stability and tightness of the conical surface mating structure, an anti-slip coating 510 is disposed on the conical inner surface 312, and the static friction between the conical inner surface 312 and the conical outer surface 420 can be properly increased by the anti-slip coating 510, so that the movement trend of the plastic joint 410 separating from the metal joint 310 can be better eliminated. It is understood that the anti-slip coating layer 510 may be formed by spraying or coating the existing anti-slip material.

It will be appreciated that a soft gel layer may be used instead of the anti-slip coating 510, the soft gel layer having a certain elasticity.

Other structures of the second embodiment are the same as those of the first embodiment, and will not be described here again.

Example III

Referring to fig. 8, in this embodiment, in order to improve stability and tightness of the conical surface mating structure, an anti-slip coating 510 is disposed on the conical outer surface 420, and the static friction between the conical inner surface 312 and the conical outer surface 420 can be properly increased by the anti-slip coating 510, so that the movement trend of the plastic joint 410 separating from the metal joint 310 can be better eliminated. It is understood that the anti-slip coating layer 510 may be formed by spraying or coating the existing anti-slip material.

It will be appreciated that a soft gel layer may be used instead of the anti-slip coating 510, the soft gel layer having a certain elasticity.

Other structures of the third embodiment are the same as those of the first embodiment, and will not be described here again.

It will be appreciated that the third embodiment may be combined with the second embodiment.

Example IV

Referring to fig. 9, in this embodiment, in order to improve stability and tightness of the conical surface mating structure, an axially located soft rubber ring 520 is disposed on the conical inner surface 312, so that the interference fit between the conical inner surface 312 and the conical outer surface 420 can be properly increased by the soft rubber ring 520, which is helpful to increase the pretightening force applied to the conical outer surface 420, and by this pretightening force, the movement trend of the plastic joint 410 separating from the metal joint 310 can be better eliminated. It is understood that only one soft rubber ring 520 may be provided, or two, three, etc. reasonable numbers may be provided at intervals along the axial direction.

Other structures of the fourth embodiment are the same as those of the first embodiment, and will not be described here again.

Example five

Referring to fig. 10, in this embodiment, in order to improve stability and tightness of the conical surface mating structure, an axially located soft rubber ring 520 is disposed on the conical outer surface 420, so that the interference fit between the conical inner surface 312 and the conical outer surface 420 can be properly increased by the soft rubber ring 520, which is helpful to increase the pretightening force applied to the conical outer surface 420, and by this pretightening force, the movement trend of the plastic joint 410 separating from the metal joint 310 can be better eliminated. It is understood that only one soft rubber ring 520 may be provided, or two, three, etc. reasonable numbers may be provided at intervals along the axial direction.

Other structures of the fifth embodiment are the same as those of the first embodiment, and will not be described here again.

It will be appreciated that the fifth embodiment may be combined with the fourth embodiment, and the soft rubber rings 520 at the two positions are staggered.

Example six

Referring to fig. 11, in this embodiment, in order to reduce the difficulty of inserting the plastic joint 410 into the connection hole 311 of the metal joint 310, the metal joint 310 is provided with a bell-mouth-shaped guiding lip 313 at an end portion remote from the dust suction pipe 320, and a guiding tapered surface 314 for guiding the plastic joint 410 to be inserted into the connection hole 311 is formed on an inner wall of the guiding lip 313. The plastic connector 410 can be contacted with the guide conical surface 314 when being connected with the dust collection pipe 320 and can be smoothly inserted into the connecting hole 311 of the metal connector 310 under the guiding action of the guide conical surface 314, the plugging and matching difficulty of the plastic connector 410 and the metal connector 310 can be properly reduced through the guide lip 313 and the guide conical surface 314, the disassembly and assembly operations are convenient for users, and the use experience of the users is further improved.

Other structures of the sixth embodiment are the same as those of the first embodiment, and will not be described here again.

It is to be understood that the sixth embodiment may be combined with any one of the second to fifth embodiments.

In addition to the above preferred embodiments, the present utility model has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the utility model, which shall fall within the scope of the utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a use reliable dust extraction, includes organism and cleaning piece, and the organism is equipped with into the dirt pipe, and cleaning piece passes through dust absorption pipe and advances dirt union coupling, its characterized in that, the both ends of dust absorption pipe are equipped with metal joint, and metal joint is equipped with encloses the toper internal surface that closes the formation connecting hole, advances dirt pipe and cleaning piece all to be equipped with plastic joint, and plastic joint's outer wall is equipped with the toper surface with toper internal surface complex toper surface, and the metal joint of dust absorption pipe one end realizes connecting hole and the plastic joint interference fit of advancing dirt pipe through the cooperation of toper internal surface and toper surface, and the metal joint of dust absorption pipe other end realizes connecting hole and cleaning piece's plastic joint interference fit through the cooperation of toper internal surface and toper surface.

2. A reliably usable cleaning apparatus according to claim 1, wherein the tapered outer surface has an axial length greater than the axial length of the tapered inner surface.

3. A reliably usable dust extraction apparatus according to claim 1, wherein said conical inner surface is provided with an anti-slip coating or a soft gel layer or a soft gel ring; and/or the conical outer surface is provided with an anti-slip coating or a soft rubber layer or a soft rubber ring.

4. A reliably usable suction device according to claim 1, wherein the metal fitting is provided with a bell-mouth-shaped guide lip at the end remote from the suction tube, the inner wall of the guide lip forming a guide cone for guiding the insertion of the plastic fitting into the attachment hole.

5. A reliably usable vacuum cleaner according to claim 1, wherein the conical inner surface is inclined at an angle α relative to the axis and the conical outer surface is inclined at an angle β, α being smaller than or equal to β relative to the axis.

6. A reliably usable cleaning apparatus according to claim 5, wherein α.ltoreq.β.ltoreq.5°.

7. A reliably usable vacuum cleaner according to claim 5, wherein a friction angle, α, β is smaller than the friction angle, at which the static friction force reaches a maximum, is provided between the conical inner surface and the conical outer surface.

8. A reliably usable cleaning apparatus according to claim 1, wherein the tapered inner surface and the tapered outer surface are conical surfaces.

9. The reliable dust collection device according to claim 1, wherein the machine body comprises a main machine with a dust collection fan inside and a dust cup detachably assembled at the front part of the main machine, and the dust inlet pipe is arranged on the dust cup.

10. A reliably usable suction device according to claim 1, characterized in that the suction tube is a corrugated plastic hose.