阅读说明：本技术 一种表面清洁头 (Surface cleaning head ) 是由 王旭宁 于 2018-07-11 设计创作，主要内容包括：本发明公开了一种表面清洁头,其包括壳体,壳体包括具有处于壳体的下侧面上的开口的吸尘腔室；可旋转地安装在吸尘腔室内且至少一部分靠近开口的刷辊；可旋转地安装在壳体上且处于刷辊和开口的前方并与刷辊间隔开的前导辊,以及设置在壳体后方并与刷辊间隔开的一个或多个后支撑轮；在刷辊的下部部分与前导辊之间限定出辊间空气通道,前导辊的外径小于刷辊的外径,前导辊的下底面位置低于刷辊的下底面位置,后支撑轮的外径大于刷辊的外径。本发明的表面清洁头整体呈现前低后高的形态,有利于表面清洁头的地面操作,对于具有竖直表面的角落以及家具和/或橱柜等具有低矮缝隙的空间均有良好的清洁效果,不留清洁死角,同时还具有良好的地面操作性能。(A surface cleaning head is disclosed comprising a housing including a suction chamber having an opening on a lower side of the housing; a brush roller rotatably installed in the dust suction chamber and having at least a portion close to the opening; a front guide roller rotatably mounted on the housing in front of the brush roll and the opening and spaced apart from the brush roll, and one or more rear support wheels disposed behind the housing and spaced apart from the brush roll; an air passage between the rollers is defined between the lower part of the brush roller and the front guide roller, the outer diameter of the front guide roller is smaller than that of the brush roller, the lower bottom surface position of the front guide roller is lower than that of the brush roller, and the outer diameter of the rear support wheel is larger than that of the brush roller. The surface cleaning head of the invention is integrally in a shape of low front and high back, is beneficial to the ground operation of the surface cleaning head, has good cleaning effect on corners with vertical surfaces and spaces with low gaps, such as furniture and/or cabinets, and the like, does not leave cleaning dead corners, and has good ground operation performance.)

1. A surface cleaning head, characterized in that the surface cleaning head comprises:

a housing including a suction chamber having an opening on a lower side of the housing;

a brush roll rotatably mounted within the suction chamber with at least a portion of the brush roll proximate the opening;

a leading roller rotatably mounted on the housing forward of and spaced apart from the brush roll and the opening to define an inter-roll air passage between a lower portion of the brush roll and the leading roller, the leading roller having an outer diameter less than an outer diameter of the brush roll, a lower bottom position of the leading roller being lower than a lower bottom position of the brush roll; and

one or more rear support wheels rotatably disposed at a rear of the housing and spaced apart from the brush roll, the rear support wheels having an outer diameter greater than an outer diameter of the brush roll.

2. A surface cleaning head as claimed in claim 1,

the spacing distance between the rotating axis of the rear supporting wheel and the rotating axis of the brush roller is 2-4 times that between the rotating axis of the front guide roller and the rotating axis of the brush roller.

3. A surface cleaning head as claimed in claim 2,

the spacing distance between the rotating axis of the front guide roller and the rotating axis of the brush roller is 40-60 mm; the spacing distance between the rotating axis of the rear supporting wheel and the rotating axis of the brush roller is 120-160 mm.

4. A surface cleaning head as claimed in claim 1,

the outer diameter of the front guide roller is 0.3-0.8 times of the outer diameter of the brush roller.

5. A surface cleaning head as claimed in claim 1,

the outer diameter of the rear supporting wheel is 1.2-2.5 times of the outer diameter of the brush roller.

6. A surface cleaning head as claimed in any one of claims 1 to 5,

the surface cleaning head also comprises a connector movably connected with the shell, the connector is used for connecting a cleaning head operating lever, a flexible pipe is arranged in the connector, and the flexible pipe can move along with the movement of the connector;

the casing still including set up the brush roll with the suction duct between the rear support wheel, the suction duct includes shrink section and equal diameter section, the entry linkage of shrink section the dust absorption chamber, the exit linkage of shrink section equal diameter section, equal diameter section connects the flexible tube.

7. A surface cleaning head as claimed in claim 6,

the contraction ratio of the contraction section is 3-6.

8. A surface cleaning head as claimed in claim 6,

the connector can for the casing rotates, just the axis of rotation of connector with the axis of rotation of rear support wheel is coaxial.

9. A surface cleaning head as claimed in claim 1 or 2 or 3 or 4 or 5 or 7 or 8,

a series of spaced-apart clear ribs are provided on the underside of the housing between the front of the opening and the leading roller, the front ends of the clear ribs are inclined downwardly and contact the leading roller at 1/5-1/3 above the lower bottom position of the leading roller at the height of the leading roller outer diameter, the rear ends of the clear ribs are below the axis of rotation of the leading roller and spaced from the brush roller by a distance of at least 1 mm.

10. A surface cleaning head as claimed in claim 1 or 2 or 3 or 4 or 5 or 7 or 8,

the brush roller and the front guide roller are driven to synchronously rotate by the driving mechanism, the transmission ratio of the driving mechanism to the brush roller is 30: 12-48: 12, and the transmission ratio of the brush roller to the front guide roller is 12: 12-30: 12.

Technical Field

The invention belongs to the technical field of cleaning equipment, and particularly relates to a surface cleaning head for a vacuum cleaner.

Background

Vacuum cleaners which utilise cyclonic separating apparatus are well known and are often also provided with a surface cleaning head which is attached to the vacuum cleaner by a cleaning head lever. When the surface cleaning head is in use, a user exerts a force on the surface cleaning head, whereby the surface cleaning head moves back and forth across the surface being cleaned and sucks in dirt and dust.

Surface cleaning heads typically have a suction inlet directed towards the surface being cleaned and a suction chamber communicating with the suction inlet to draw air and dirt and dust into or through the surface cleaning head. In household cleaning, vertical surfaces such as walls, trims and the like are often encountered, but dust suction inlets at the bottom of the surface cleaning head cannot clean the corner positions; in addition, the existing surface cleaning head is often large in size and not easy to penetrate into gaps at corners, so that cleaning cannot be performed; therefore, the existing surface cleaning head is easy to leave a cleaning dead angle, a user needs to spend manual work to process the dead angle, the cleaning effect is not ideal enough, and the user experience is poor.

During the rearward travel of the surface cleaning head, where a user applies a pulling force on the vacuum cleaner, the user will typically pull in an upward and rearward direction, which in some cases may lift the support wheels and housing base at the rear of the surface cleaning head away from the surface being cleaned, thereby reducing the sealing effect between the surface cleaning head and the surface being cleaned, resulting in a reduction in the partial vacuum generated in the surface cleaning head, reducing cleaning performance.

The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.

Disclosure of Invention

In order to solve the above problems, it is an object of the present invention to provide a surface cleaning head having a good cleaning effect for corners having vertical surfaces and spaces having low crevices such as furniture and/or cabinets without leaving dead corners for cleaning; still have good ground operating performance simultaneously, can avoid the first rear portion of surface cleaning to be promoted and leave by the clean surface, guarantee dust absorption performance, operate more laborsaving moreover, user experience is good.

To achieve the above object, the present invention proposes a surface cleaning head comprising: a housing including a suction chamber having an opening on a lower side of the housing; a brush roll rotatably mounted within the suction chamber with at least a portion of the brush roll proximate the opening; a leading roller rotatably mounted on the housing forward of and spaced apart from the brush roll and the opening to define an inter-roll air passage between a lower portion of the brush roll and the leading roller, the leading roller having an outer diameter less than an outer diameter of the brush roll, a lower bottom position of the leading roller being lower than a lower bottom position of the brush roll; and one or more rear support wheels rotatably disposed at the rear of the housing and spaced apart from the brush roller, the rear support wheels having an outer diameter greater than that of the brush roller.

In one example, a spaced distance between the rotation axis of the rear support wheel and the rotation axis of the brush roller is 2 to 4 times larger than a spaced distance between the rotation axis of the front guide roller and the rotation axis of the brush roller.

In one example, the distance between the rotating axis of the front guide roller and the rotating axis of the brush roller is 40-60 mm; the spacing distance between the rotating axis of the rear supporting wheel and the rotating axis of the brush roller is 120-160 mm.

In one example, the outer diameter of the leading roller is 0.3 to 0.8 times the outer diameter of the brush roller.

In one example, the outer diameter of the rear support wheel is 1.2-2.5 times the outer diameter of the brush roll.

In one example, the surface cleaning head further comprises a connector movably connected with the housing, the connector is used for connecting a cleaning head operating rod, a flexible pipe is arranged in the connector, and the flexible pipe can move along with the movement of the connector; the casing still including set up the brush roll with the suction duct between the rear support wheel, the suction duct includes shrink section and equal diameter section, the entry linkage of shrink section the dust absorption chamber, the exit linkage of shrink section equal diameter section, equal diameter section connects the flexible tube.

In one example, the shrinkage ratio of the shrinkage section is 3-6.

In one example, the connecting head is rotatable relative to the housing, and the axis of rotation of the connecting head is coaxial with the axis of rotation of the rear support wheel.

In one example, a series of spaced-apart clearance ribs are provided on the underside of the housing between the front of the opening and the front guide roller, the front ends of the clearance ribs being inclined downwardly and contacting the front guide roller at a height 1/5-1/3 above the lower bottom position of the front guide roller at the outer diameter of the front guide roller, the rear ends of the clearance ribs being below the axis of rotation of the front guide roller and spaced from the brush roller by a distance of at least 1 mm.

In one example, the brush roller and the front guide roller can be driven to rotate synchronously by a driving mechanism, the transmission ratio of the driving mechanism to the brush roller is 30: 12-48: 12, and the transmission ratio of the brush roller to the front guide roller is 12: 12-30: 12.

The surface cleaning head provided by the invention can bring the following beneficial effects:

1. by adopting the front guide roller with the outer diameter smaller than that of the brush roller and the rear support roller with the outer diameter larger than that of the brush roller, the surface cleaning head is integrally in a form of being low in front and high in rear, the form of being low in front and high in rear is beneficial to ground operation of the surface cleaning head, a good cleaning effect is achieved for corners with vertical surfaces and spaces with low gaps such as furniture and/or cabinets, and cleaning dead corners are not reserved; still have good ground operating performance, can avoid the first rear portion of surface cleaning to be promoted and leave by the clean surface, guarantee dust absorption performance, operate more laborsavingly moreover, user experience is good.

2. The suction pipeline with the contraction section is arranged between the brush roll and the rear supporting wheel, the contraction section is suitable for collecting relatively low-speed and disordered suction airflow in the dust suction chamber, the suction airflow is accelerated, meanwhile, the turbulence degree and fluid noise of the suction airflow are reduced, the energy loss is reduced, stable airflow with relatively stable flow and higher speed is obtained, and therefore the suction brush roll has higher suction capacity and the capacity of carrying debris and dust; the equal-diameter section can be used as a buffer area of airflow, so that the suction airflow can better adapt to the curved shape of the flexible pipe wall, the impact of the suction airflow on the flexible pipe wall is weakened, the energy loss is reduced, the retention of chips and dust is avoided, the capability of carrying the chips and the dust by the suction airflow is enhanced, and the cleaning efficiency is higher.

3. Removing debris bound on the leading roller by providing a clearance rib above the air channel between the rollers such that the removed debris falls into the air channel between the rollers and into the flow path to the suction chamber, enhancing the ability to remove debris from the surface being cleaned; the clearance ribs can also reduce potential damage to the bristles of the leading roll; the clearance ribs may also prevent air from flowing to the top of the leading roller such that an upper portion of the leading roller is located outside of the flow path to the suction chamber.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a front view of a surface cleaning head according to an embodiment of the present invention;

FIG. 2 is a top view of a surface cleaning head according to an embodiment of the present invention;

FIG. 3 is a force analysis comparison graph of a surface cleaning head provided by an embodiment of the present invention with a conventional cleaning head during a forward stroke;

fig. 4 is a force analysis comparison graph of a surface cleaning head provided by an embodiment of the invention and a common cleaning head in a backward moving stroke.

Detailed Description

In order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

Surface cleaning heads are typically configured to contact a surface in order to clean the surface using a suction air flow, agitation, or a combination of suction air flow and agitation. The surface cleaning head is pivotably or steerably coupled by a swivel connection to a cleaning head lever for controlling the surface cleaning head, which may also be operated without the cleaning head lever or handle. When the designated surface cleaning head is used, one surface close to the surface to be cleaned is a lower side surface; when the appointed surface cleaning head is used, the direction in which a user applies pushing force to push the surface cleaning head to advance is the front direction, and the direction in which the user applies pulling force to pull the surface cleaning head to retreat is the rear direction. As used herein, "agitator" means any element, member or structure capable of agitating a surface to facilitate moving dirt and debris into a suction airflow in a surface cleaning head. The term "leading" as used herein refers to a position that is forward of at least one other component but does not necessarily mean forward of all other components. As used herein, "soft" and "softer" refer to the characteristic of one surface cleaning head being more conformable or flexible than another surface cleaning head. As used herein, the term "seal" means to prevent a significant amount of air from passing through the suction chamber, rather than requiring an air-tight seal, which means that the restriction/occlusion of the gap between the surface cleaning head and the surface being cleaned is sufficient to maintain the static pressure within the suction chamber at least 1kPa below ambient static pressure during normal use. The term "flow path" as used herein means the path along which air flows when it is drawn in by suction. The broken line arrows in fig. 1 indicate the flow path of air, and the solid line arrows in fig. 3 and 4 indicate the direction of the force.

As shown in fig. 1 and 2, an embodiment of the present invention proposes a surface cleaning head 100 including a housing 1, a brush roller 2, a front guide roller 3, and a rear support wheel 4. Wherein the housing 1 has a front side 1a, a rear side 1b, a left side 1c, a right side 1d, an upper side 1e and a lower side 1f, a dust suction chamber 11 being defined by the inner walls of the housing 1, the dust suction chamber 11 having an opening 12 on the lower side 1f of the housing 1 between the front side 1a and the rear side 1b, the dust suction chamber 11 receiving and guiding air sucked by suction through the surface cleaning head 100.

The brush roller 2 is rotatably mounted in the dust suction chamber 11 with at least a portion of the brush roller 2 near the opening 12, and the rotation axis of the brush roller 2 is set to a first rotation axis RA1, the first rotation axis RA1 being substantially parallel to the front side of the housing 1. The exterior of the brush roll 2 is provided with bristles and the brush roll 2 rotates about a first axis of rotation RA1 so that the bristles can agitate on the surface 200 being cleaned to move dust and debris into the suction airflow in the suction chamber 11, facilitating the capture of debris by the surface cleaning head 100. Wherein the outer diameter of the brush roll 2 is the largest diameter including the outer bristles.

The leading roller 3 is rotatably mounted on the front side 1a of the housing 1, the axis of rotation of the leading roller 3 being arranged as a second axis of rotation RA2, the second axis of rotation RA2 being parallel to the first axis of rotation RA 1. The exterior of the leading roller 3 may provide a softer cleaning element than the bristles of the brush roll 2, enabling the leading roller 3 to engage the debris and dust while the leading roller 3 rotates about the second axis of rotation RA2, thereby moving the debris and dust toward the opening 12, facilitating the capture of the debris and dust, and enhancing the ability to remove the debris and dust from the surface 200 being cleaned. Wherein the outer diameter of the leading roller 3 is the largest diameter including the outer cleaning elements. The leading roller 3 is arranged in front of and adjacent to the opening 12 of the dust suction chamber 11 with at least an upper portion of the leading roller 3 located outside of the flow path to the dust suction chamber 11, a bottom portion of the leading roller 3 being exposed in the flow path to the dust suction chamber 11, while the leading roller 3 is located in front of the brush roller 2 and spaced from the brush roller 2 to define an inter-roller air passage 13 between a lower portion of the brush roller 2 and the leading roller 3, the inter-roller air passage 13 providing at least a portion of the flow path to the opening 12 of the dust suction chamber 11 so that debris and dust can be carried into the dust suction chamber 11 by the suction airflow to promote the capture of debris and dust in the airflow entering the dust suction chamber 11. The outer diameter of the leading roller 3 is smaller than the outer diameter of the brush roller 2 so that the rotating shaft of the leading roller 3 is closer to the front side of the surface cleaning head 100 and the bottom contact surface of the leading roller 3 moves forward toward the front side of the surface cleaning head 100, and when the surface cleaning head 100 contacts a vertical surface (such as, but not limited to, a wall, trim, and/or cabinet), the bottom contact surface of the leading roller 3 is also closer to the vertical surface, thereby enabling better front end cleaning and enhancing the cleaning ability of the surface cleaning head 100 to corners having vertical surfaces. The front guide roller 3 is arranged in front of the brush roller 2 to provide a lower external profile at the front of the surface cleaning head 100, reducing the height of the front side of the surface cleaning head 100 from the surface 200 to be cleaned, facilitating the entry of the surface cleaning head 100 into low crevice spaces for cleaning, enabling the surface cleaning head 100 to be adapted to the underside of furniture and/or cabinets and the like, further enhancing the front edge cleaning capability of the surface cleaning head 100. The lower bottom position of the leading roller 3 is lower than that of the brush roller 2, and when used on the surface 200 to be cleaned, the leading roller 3 at least partially closes the front side of the lower side 1f of the housing 1, increasing the suction force and guiding the debris and dust from the surface 200 to be cleaned to the inter-roller air passage 13, thereby enhancing the ability to remove the debris and dust from the surface 200 to be cleaned.

One or more larger rear support wheels 4 are rotatably disposed rearward of the housing 1 and spaced from the brush roll 2, the rear support wheels 4 having a third rotational axis RA3 of rotation, the third rotational axis RA3 being parallel to the first rotational axis RA 1. The rear support wheels 4 primarily support the surface cleaning head 100 on the surface 200 to be cleaned, thereby facilitating movement of the surface cleaning head 100 along the surface 200 to be cleaned. The outer diameter of the rear support wheels 4 is greater than the outer diameter of the brush roller 2 and when used on the surface 200 to be cleaned, the front guide rollers 3 together with the rear support wheels 4 provide the primary contact with the surface 200 to be cleaned so that the surface cleaning head 100 as a whole assumes a low front to high configuration which facilitates floor operation of the surface cleaning head 100.

Specifically, as shown in fig. 3, it is a comparison graph of the force analysis during the forward moving stroke of the user using the surface cleaning head 100 of the present invention having a front-low back-high configuration and a general cleaning head of the same height, respectively. During the forward stroke of the surface cleaning head 100, the user applies a pushing force on the vacuum cleaner, typically the user will push in a downward and forward direction. For convenience of explanation, given that a user applies a horizontal forward thrust Ft, and an included angle between a cleaning head operating lever on a common cleaning head and the ground is set to be α, an included angle between a cleaning head operating lever on the surface cleaning head 100 of the present invention and the ground is set to be β, and since the height of the same user is constant, β < α can be obtained; also, as is known from experience in everyday life, the angle between the wand of the cleaner head and the floor when the user pushes the vacuum cleaner is typically less than 45, and so β < α < 45. Respectively for common cleaning head and hairThe clear surface cleaner head 100 was force analyzed to obtain a forward thrust F1 ═ Ftcos for a conventional cleaner head²α, the forward thrust experienced by the surface cleaning head 100 of the present invention is F2 ═ Ftcos²β, as seen by the trigonometric function, F1 < F2, i.e., the forward thrust experienced by the surface cleaning head 100 of the present invention is greater for the same amount of horizontal thrust used by the user; conversely, less thrust is required to advance the surface cleaning head 100 of the present invention, and thus the operation is more labor-efficient.

As shown in fig. 4, it is a comparison graph of the force analysis of the user in the backward moving stroke using the surface cleaning head 100 having the front-low back-high form of the present invention and the cleaning head of the same general height, respectively. During the rearward stroke of the surface cleaning head 100, the user exerts a pulling force on the vacuum cleaner, and typically the user will pull in an upward and rearward direction. For ease of illustration, given a user applying a horizontal rearward pulling force Fl, the angle between the wand of a conventional cleaner head and the floor is α, and the angle between the wand of the surface cleaner head 100 of the present invention and the floor is β, which is equivalent to β < α < 45 °. The common cleaning head and the surface cleaning head 100 of the invention are subjected to stress analysis respectively to obtain that the upward pulling force exerted on the common cleaning head is F3 ═ Flcos alpha sin alpha, and the upward pulling force exerted on the surface cleaning head 100 of the invention is F4 ═ Flcos beta sin beta, as can be seen from a trigonometric function, F3 is greater than F4, that is, under the condition that a user uses the same horizontal pulling force, the upward pulling force exerted on the surface cleaning head 100 of the invention is smaller, so that the rear supporting wheel 4 and the bottom of the housing 1 are prevented from being lifted to leave the surface 200 to be cleaned when the surface cleaning head 100 is pulled backwards, the sealing effect between the surface cleaning head 100 and the surface 200 to be cleaned is ensured, and the dust collection performance is ensured.

Specifically, one or more smaller intermediate wheels 14 may be further included, rotatably provided on the lower side of the left and right sides of the housing 1 between the brush roller 2 and the front guide roller 3 and at the left and right ends of the inter-roller air passage 13; the axis of rotation of the intermediate wheel 14 is parallel to the third axis of rotation RA3 and the surface cleaning head 100 is supported on the surface 200 to be cleaned by the intermediate wheel 14 in conjunction with the rear support wheel 4 to facilitate movement of the surface cleaning head 100 along the surface 200 to be cleaned. The outer diameter of the intermediate wheel 14 is smaller than the outer diameter of the rear support wheel 4, and further, the outer diameter of the intermediate wheel 14 is 0.2 times the outer diameter of the rear support wheel 4, for example, the outer diameter of the intermediate wheel 14 is 16mm, and the outer diameter of the rear support wheel 4 is 80 mm. When used on a surface 200 to be cleaned, the surface cleaning head 100 is caused to assume a low-front-high configuration overall, thereby facilitating floor-based operation of the surface cleaning head 100.

Specifically, as shown in fig. 2, the brush roller device further comprises a driving mechanism 5, and the driving mechanism 5 can drive the brush roller 2 and the leading roller 3 to synchronously rotate. For example, the drive mechanism 5 may be an electric motor that drives the brush roller 2 and the leading roller 3 to rotate in the same direction by a belt drive or to rotate in opposite directions. The transmission ratio of the driving mechanism 5 to the brush roller 2 is 30: 12-48: 12, and the transmission ratio of the brush roller 2 to the front guide roller 3 is 12: 12-30: 12. For example, it may be assumed that the transmission ratio of the drive mechanism 5 to the brush roller 2 is 36:12, the transmission ratio of the brush roller 2 to the leading roller 3 is 20:12, or that the brush roller 2 and the leading roller 3 rotate at the same speed. Such an arrangement may reduce the number of components, simplify the structure of the surface cleaning head 100, reduce power train losses, and be less expensive to manufacture. Furthermore, the smaller outer diameter of the leading roller 3 also reduces the load/resistance on the drive mechanism 5, thus increasing the service life of the drive mechanism 5, and/or allows a smaller drive mechanism 5 to be used to drive the brush roller 2 and the leading roller 3 in a synchronous rotational movement.

Specifically, the brush roller 2 is spaced apart from the leading roller 3 by a distance greater than 0mm so that the leading roller 3 does not contact the brush roller 2, while allowing an inter-roller air passage 13 to be formed between the leading roller 3 and a lower portion of the brush roller 2, the inter-roller air passage 13 providing a portion of a flow path to the dust suction chamber 11, improving the cleaning efficiency of the surface cleaning head 100.

Specifically, the spacing distance between the rotation axis of the rear supporting wheel 4 and the rotation axis of the brush roller 2 is 2-4 times that between the rotation axis of the front guide roller 3 and the rotation axis of the brush roller 2. For example, the distance between the second rotation axis RA2 of the front guide roller 3 and the first rotation axis RA1 of the brush roller 2 may be 40 to 60mm, and the distance between the third rotation axis RA3 of the rear support wheel 4 and the first rotation axis RA1 of the brush roller 2 may be 120 to 160 mm.

Specifically, the outer diameter of the front guide roller 3 is 0.3-0.8 times of the outer diameter of the brush roller 2. For example, the brush roller 2 may have an outer diameter of 40mm, and the corresponding leading roller 3 may have an outer diameter of 32 mm. When the leading roller 3 has an outer diameter smaller than the outer diameter of the brush roller 2, the brush roller 2 may have bristles longer than the cleaning elements (e.g., bristles and/or hairs) of the leading roller 3.

Specifically, the outer diameter of the rear supporting wheel 4 is 1.2-2.5 times of the outer diameter of the brush roller 2. For example, the brush roller 2 has an outer diameter of 40mm, and the corresponding removable back-up wheel 4 has an outer diameter of 80 mm.

Specifically, as shown in fig. 1 and 2, the surface cleaning head 100 further includes a connector 6, one end of the connector 6 is movably connected to the housing 1, and the other end is used for connecting to a cleaning head operating lever (not shown); a flexible pipe 7 is arranged in the connector 6, and the flexible pipe 7 can move along with the movement of the connector 6; the housing 1 further comprises a suction duct 8 arranged between the brush roller 2 and the rear supporting wheel 4, the suction duct 8 comprises a constriction 81 and an equal diameter section 82, the inlet of the constriction 81 is connected to the dust suction chamber 11, the outlet of the constriction 81 is connected to the equal diameter section 82, and the equal diameter section 82 is connected to the flexible tube 7. When a user uses the vacuum cleaner, the user typically rocks the cleaner head lever to adjust the operating angle, whereupon the coupling head 6 attached to the cleaner head lever rotates relative to the housing 1 of the surface cleaner head 100 and causes the flexible tube 7 to bend. When the suction airflow and the debris and dust carried therein move into the curved flexible tube 7, the disordered suction airflow may hit the flexible tube wall, thereby generating turbulence and causing energy loss, so that the speed of the suction airflow is reduced, the debris and dust also may hit the flexible tube wall and then be retained at a reduced speed, so that the capability of the suction airflow to carry the debris and dust is weakened, the vacuum cleaner needs to use more power to achieve a dust collection effect, and the cleaning effect is not ideal. The suction pipe 8 is arranged and can be used as a buffer area between the dust suction chamber 11 and the flexible pipe 7, the contraction section 81 is communicated with the dust suction chamber 11, the trumpet-shaped inlet is suitable for collecting relatively low-speed and disordered suction airflow in the dust suction chamber 11, the suction airflow is uniformly accelerated through the contracted side wall, and meanwhile, the functions of reducing turbulence, reducing fluid noise and reducing energy loss can be achieved, so that stable airflow with relatively stable flow and higher speed is obtained, and the stable airflow with higher speed has stronger suction capacity and capability of carrying debris and dust; when the stable air flow enters the bent flexible pipe 7 after passing through the equal-diameter section 82, the stable air flow can better adapt to the bent shape of the flexible pipe wall, so that the impact of the sucked air flow on the flexible pipe wall is weakened, the energy loss is reduced, the retention of chips and dust is avoided, the capability of carrying the chips and the dust by the sucked air flow is enhanced, and the cleaning efficiency under the same power is higher.

Specifically, an important parameter for measuring the performance of the constriction 81 is the constriction ratio, which can be expressed by the ratio of the inlet area to the outlet area of the constriction 81. The main design principle of the constriction 81 is: the fluids are not separated, and the outlet flow field is uniform, parallel and stable. Therefore, the size of the surface cleaning head 100 and the requirements on the flow and speed of the sucked air flow are comprehensively considered, the contraction ratio of the contraction section 81 is selected to be 3-6, the ideal suction amount can be obtained, and meanwhile, the energy loss and the dust collection efficiency are considered, and the good cleaning effect is obtained. For example, the inlet area of the constriction 81 is about 5000mm2 and the outlet area is about 900mm²The contraction section 81 has a contraction ratio of about 5.56.

In particular, the connection head 6 is rotatable with respect to the housing 1, and the axis of rotation of the connection head 6 is coaxial with the axis of rotation of the rear support wheel 4, both third axes of rotation RA 3. Because the connecting head 6 and the rear support wheel 4 both rotate around the third rotation axis RA3, the force applied to the connecting head 6 does not generate a moment around the third rotation axis RA3, so that the rear support wheel 4 is prevented from being lifted away from the surface 200 to be cleaned when the connecting head 6 is pulled, and the cleaning effect is ensured.

Specifically, the spacing distance between the rotational axis of the rear support wheel 4 and the rotational axis of the brush roller 2 is determined by the length of the suction duct 8. The suction duct 8 is provided between the brush roll 2 and the rear support wheel 4, and therefore the length of the suction duct 8 should be smaller than the spacing distance between the brush roll 2 and the rear support wheel 4. After the length of the constriction 81 has been determined on the basis of the constriction ratio, the length of the constant diameter section 82 is determined again, so that the determined length of the suction line 8 is obtained and the distance between the brush roller 2 and the rear support wheel 4, i.e. the distance between the axis of rotation of the rear support wheel 4 and the axis of rotation of the brush roller 2, can only be determined.

Specifically, as shown in fig. 1, a series of spaced-apart removing ribs 9 are provided on the lower side of the casing 1 between the front of the opening 12 and the front guide roller 3, thereby forming a removing part shaped like a comb, and the removing ribs 9 are comb teeth of the comb. The front end of the clearing rib 9 is inclined downwards at a certain angle and contacts the front guide roller 3 at the height of the outer diameter of the front guide roller 3 which is 1/5-1/3 above the position of the lower bottom surface of the front guide roller 3, for example, at the height of the outer diameter of the front guide roller 3 of about 1/4, so that the chips combined on the front guide roller 3 are removed in a carding-like manner; also the clearance ribs 9 are located above the inter-roller air passages 13 so that removed debris falls into the inter-roller air passages 13 and into the flow path to the suction chamber 11, enhancing the ability to remove debris from the surface 200 being cleaned. A series of clearance ribs 9 may provide a series of points of contact with the leading roller 3 to remove debris from the leading roller 3 while reducing potential damage to the bristles of the leading roller 3; the clearance rib 9 also prevents air from flowing to the top of the leading roller 3 so that the upper half of the leading roller 3 is not exposed to the flow path to the suction chamber 11. The rear end of the removing rib 9 is below the rotation axis of the leading roller 3 and spaced apart from the bristles of the brush roller 2 by a distance of at least 1mm, for example, the minimum distance between the rear end of the removing rib 9 and the bristles of the brush roller 2 is 3mm, so that the rear end of the removing rib 9 does not contact the brush roller 2 and does not interfere with the movement of the brush roller 2.

Specifically, the brush roller 2 is detachably mounted in the dust suction chamber 11, and/or the leading roller 3 is detachably mounted on the housing 1. The brush roller 2 and/or the leading roller 3 are detachable, so that the brush roller 2 and/or the leading roller can be cleaned more easily, and the brush roller 2 and/or the leading roller 3 of a suitable size and/or the brush roller 2 and/or the leading roller 3 with a suitable bristle type can be selected according to the intended use environment.

Specifically, the front side of the housing 1 is further provided with at least one illumination member 10, and the illumination member 10 may be disposed above the front guide roller 3. For example, the lighting component 10 may be an LED lamp. When the surface cleaning head 100 is applied under an object having a low gap space such as furniture and/or a cabinet, in which light is always insufficient, the illumination unit 10 can provide a light source for observation, so that sweeping is more thorough without leaving dead space.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.