An air duct switching device, a cleaning head and a vacuum cleaner

Abstract

The present invention provides an air duct switching device, a cleaning head and a vacuum cleaner. The air duct switching device is arranged in an air duct pipe fitting. The air duct pipe fitting has a plurality of flow channels with different directions and converging at a point. The switching device includes: a commutation valve body arranged in a first flow channel among the plurality of flow channels. The commutation valve body is integrally tubular and the outer wall is in sealed contact with the inner wall of the first flow channel. One end of the commutation valve body is a commutation blocking end located at the convergence point of the plurality of flow channels. The commutation blocking end is a semi-closed structure with a ventilation opening on one side; a commutation power component capable of driving the commutation valve body to rotate circumferentially to switch the flow channel corresponding to the ventilation opening. Based on the technical solution of the present invention, the uniqueness of the working air duct is ensured, so that the actual cross-sectional area of the air flow always corresponds to the cross-sectional area of a single flow channel, greatly reducing the actual cross-sectional area of the air flow, increasing the wind speed, and solving the problem that the wind speed of electrical equipment decreases due to the simultaneous passage of air flow through multiple flow channels.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliance air duct structures, and particularly to an air duct switching device, a cleaning head and a vacuum cleaner. Background Art

[0002] At present, many electrical appliances that achieve corresponding functions based on air flow have gradually developed the function of multi-directional air flow generation, that is, they have multiple air ducts with different directions, such as vacuum cleaners and some other blowing devices, to adapt to the changing user needs and improve the user experience.

[0003] Taking a vacuum cleaner as an example, currently there are vacuum cleaners equipped with a two-way air intake cleaning head, which can ensure that when the user pushes forward and pulls backward, dry garbage on the ground can be collected by suction. However, the problem with the current two-way air intake cleaning head is that its suction capacity is significantly reduced compared to the cleaning head with a single air intake. The reason is that due to two-way suction, the two-way air intake cleaning head needs to ensure that both the front and rear air intakes can pass dry garbage with a common diameter. Therefore, the air intake structure of the existing two-way air intake cleaning head is to add an air intake of the same specification on the basis of the single air intake cleaning head. This actually results in the cross-sectional area of the air intake of the two-way air intake cleaning head being doubled compared to the single air intake cleaning head. As a result, when the motor power remains unchanged, the air flow velocity at the air intake decreases significantly as the cross-sectional area of the air intake increases, ultimately causing the problem of a significant decrease in the suction capacity of the two-way air intake cleaning head.

[0004] The above problems are also potential defects common to some other electrical appliances that achieve functions based on air flow, that is, while having multiple air ducts with different directions, due to the increase in the total area of the air inlet and outlet of the air duct, the air flow velocity in a specific single direction is greatly reduced. Therefore, an air duct switching device that can increase the air flow velocity at the air inlet and outlet without changing the motor power is needed. Summary of the Invention

[0005] In order to solve the problem of the reduction of the air flow velocity in a single direction caused by the lack of an air duct switching function in related electrical appliances with multi-directional air ducts in the prior art, the present application proposes an air duct switching device, a cleaning head and a vacuum cleaner.

[0006] In a first aspect, the present invention proposes an air duct switching device disposed in an air duct pipe fitting. The air duct pipe fitting has a plurality of flow channels with different directions that converge at a point. The switching device includes:

[0007] A reversing valve body is disposed in a first flow channel among the plurality of flow channels. One end of the reversing valve body is a reversing blocking end located at the convergence point of the plurality of flow channels. The reversing blocking end is a semi-closed structure with a ventilation opening on one side;

[0008] A commutation power component, which includes a transmission assembly that cooperates with the commutation valve body. The transmission assembly can drive the commutation valve body to rotate circumferentially to switch the flow channel corresponding to the ventilation port by rotation.

[0009] In one embodiment, the multiple flow channels include two types of flow channels, an air inlet flow channel and an air outlet flow channel. The first flow channel is the only air inlet flow channel or the air outlet flow channel. Through this embodiment, the flow channel where the air duct switching device is located is the only way for the air flow, ensuring the reliability of the switching function of the air duct switching device.

[0010] In one embodiment, the circumferential surface of the commutation valve body has an annular groove extending circumferentially, and a transmission tooth is arranged in the groove to form an external gear ring. The transmission assembly is a gear that cooperates with the external gear ring.

[0011] In one embodiment, the commutation power component is arranged on the outer wall of the first flow channel, and an opening corresponding to the transmission assembly is provided on the wall surface of the first flow channel for the transmission assembly to pass through and cooperate with the commutation valve body. Through this embodiment, the gear of the transmission assembly cooperates with the external gear ring arranged in the groove on the commutation valve body. In this way, when the gear meshes with the external gear ring, the tooth part of the gear and the groove wall of the groove are mutually limited, thereby playing a positioning function for the commutation valve body.

[0012] In one embodiment, a magnet is arranged on the wall surface on one side of the commutation valve body, and a Hall sensor capable of sensing the magnetic field intensity of the magnet is provided in the commutation power component. Through this embodiment, by the change in the magnetic field intensity of the magnet sensed by the Hall sensor, the relative position of the magnet can be obtained, and then the orientation of the ventilation port can be judged based on the position of the magnet, providing a basis for the position and direction of the commutation power component to drive the commutation valve body.

[0013] In one embodiment, the magnet is arranged on the side where the ventilation port is located, or the magnet is arranged on the other side relative to the side where the ventilation port is located. Through this embodiment, the magnet is arranged on the side corresponding to the ventilation port or the other side relative to the side where the ventilation port is located, which can simplify the judgment of the orientation of the ventilation port.

[0014] In one embodiment, an acceleration sensor is further provided in the commutation power component. The acceleration sensor can sense the movement direction of the electrical equipment where the switching device is located to control the commutation power component to drive the commutation valve body. Through this embodiment, when the air duct switching device is applied to specific electrical equipment, the switching of the air duct can be automatically controlled according to the movement direction of the electrical equipment.

[0015] In one embodiment, the outer contour of the vent projects as a circle on the cross-section of the corresponding flow channel, and the size of the circle is the same as the size of the cross-section of the flow channel. With this embodiment, the vent matches the cross-sectional size of the flow channel, avoiding blocking the airflow passing through the flow channel and ensuring the normal function of the corresponding electrical equipment.

[0016] In a second aspect, the present invention provides a cleaning head, which includes the above-mentioned air duct switching device and an air duct tee. The air duct tee has two air inlet channels and one air outlet channel, and the air duct switching device is arranged in the air outlet channel.

[0017] In a second aspect, the present invention provides a vacuum cleaner, which includes the above-mentioned cleaning head.

[0018] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the object of the present invention can be achieved.

[0019] Compared with the prior art, the air duct switching device, cleaning head and vacuum cleaner provided by the present invention have at least the following beneficial effects:

[0020] The air duct switching device of the present invention can be applied to electrical equipment with multiple air ducts and multiple flow channels, switch the air ducts according to actual needs, and ensure the uniqueness of the air duct during the operation of the electrical equipment, that is, only a set of corresponding air inlet channels and air outlet channels form a working air duct at the same time, and the remaining air inlet and outlet channels are closed, so that the actual cross-sectional area of the airflow passage always corresponds to the cross-sectional area of a single flow channel. Compared with the prior art, the actual cross-sectional area of the airflow passage is greatly reduced, the wind speed is increased, and the problem that the wind speed of the electrical equipment decreases due to the simultaneous passage of airflow through multiple flow channels is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings. Among them:

[0022] Figure 1 Shows a schematic structural diagram of the air duct switching device of the present invention assembled in an air duct fitting;

[0023] Figure 2 Shows a schematic structural diagram of the reversing valve body of the air duct switching device of the present invention;

[0024] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0025] Reference Numerals:

[0026] 10 - Air duct fitting, 101 - Air inlet, 11 - First flow channel, 111 - Opening, 20 - Commutating valve body, 21 - Commutating and blocking end, 211 - Ventilation opening, 22 - Groove, 23 - Magnet, 30 - Commutating power component, 31 - Transmission assembly, 32 - Commutating motor, 40 - Rotating brush. Detailed implementation mode

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] An embodiment of the present invention provides an air duct switching device, which is arranged in the air duct fitting 10. The air duct fitting 10 has a plurality of flow channels with different directions and converging at one point. The switching device includes:

[0029] A commutating valve body 20, which is arranged in the first flow channel 11 among the plurality of flow channels. One end of the commutating valve body 20 is a commutating and blocking end 21 located at the convergence point of the plurality of flow channels. The commutating and blocking end 21 is a semi - enclosed structure with a ventilation opening 211 on one side;

[0030] A commutating power component 30, which includes a transmission assembly 31 that cooperates with the commutating valve body 20. The transmission assembly 31 can drive the commutating valve body 20 to rotate circumferentially to switch the flow channel corresponding to the ventilation opening 211 through rotation.

[0031] Specifically, as shown in the attached drawings Figure 1 And Figure 2 The air duct switching device of the present invention is arranged in the multi - flow - channel air duct fitting 10 of the corresponding electrical equipment. The plurality of flow channels intersect at one point, and this intersection point is the key point for realizing air duct switching. The whole air duct switching device corresponds to one of the plurality of flow channels of the air duct fitting 10, which is the first flow channel 11.

[0032] The switching device mainly includes a reversing valve body 20 and a reversing power component 30 that drives the reversing valve body 20 to move to switch the air duct. The reversing valve body 20 is integrally tubular, with one end being a completely open pipe orifice and the other end being a reversing sealing end 21 with a ventilation opening 211. The reversing sealing end 21 is a semi-closed structure. The reversing valve body 20 is inserted into the first flow channel 11 and its outer wall is in sealed contact with the inner wall of the first flow channel 11. And its reversing sealing end 21 is arranged at the confluence of multiple flow channels and plays a certain sealing function for this confluence. Thus, the air flow passing through the air duct pipe fitting 10 can only flow between the first flow channel 11 and one of the other flow channels through the ventilation opening 211 on the reversing sealing end 21 of the reversing valve body 20. By providing power through the reversing power component 30 and driving the reversing valve body 20 to rotate circumferentially through the transmission assembly 31, the orientation of the ventilation opening 211 on the reversing sealing end 21 of the reversing valve body 20 can be changed, that is, select the flow channel corresponding to the ventilation opening 211 among the multiple flow channels of the air duct pipe fitting 10. The flow channel corresponding to the ventilation opening 211 is connected to the first flow channel 11 and together forms the working air duct, while the other flow channels not corresponding to the ventilation opening 211 are blocked by the reversing sealing end 21, thereby realizing the switching of the working air duct and at the same time ensuring that the ventilation cross-sectional area of the working air duct is equal to the ventilation cross-sectional area of a single flow channel, rather than the total ventilation cross-sectional area of all flow channels. Therefore, the ventilation cross-sectional area during actual operation is reduced. Without changing the power of the main motor 32 of the equipment, the air flow speed is increased, and the performance of the corresponding electrical equipment is improved.

[0033] Preferably, among the multiple flow channels, there are two types of flow channels, namely the air inlet flow channel and the air outlet flow channel, and the first flow channel 11 is the only air inlet flow channel or air outlet flow channel.

[0034] Specifically, among the multiple flow channels in the air duct pipe fitting 10, there must be two types of flow channels, namely the air inlet flow channel and the air outlet flow channel. Therefore, in order to ensure the reliability of the switching function of the air duct switching device, the first flow channel 11 where the air duct switching device is located must be the only path for the air flow. So the first flow channel 11 must be unique, that is, the only air inlet flow channel or the only air outlet flow channel, which is determined by the type of electrical equipment where the switching device is actually located. For example, if the electrical equipment where the air duct switching device is located is a vacuum cleaner, as shown in the attached drawing Figure 1 shown, then according to the function of the vacuum cleaner, its air duct pipe fitting 10 has multiple dust suction ports (air inlet flow channels) and one air outlet flow channel (to the dust collection bin). At this time, the air duct switching device should be correspondingly arranged in the air outlet flow channel. If the electrical equipment where the air duct switching device is located is a blowing device, then according to the function of the blowing device, its air duct pipe fitting 10 has multiple air outlet ports (air outlet flow channels) and one air inlet flow channel (connected to the blower). At this time, the air duct switching device should be correspondingly arranged in the air inlet flow channel.

[0035] And if the first flow channel 11 is not the only air inlet flow channel or air outlet flow channel, specifically in the electrical equipment, for example, in the above-mentioned attached drawing Figure 1For the vacuum cleaner shown, if the air duct switching device is arranged in one of the incoming air ducts, then the air duct switching device actually only serves to open and close the air duct; if the ventilation opening 211 corresponds to the outgoing air duct, this incoming air duct is opened and serves as the working air duct connecting the outgoing air duct; if the ventilation opening 211 does not correspond to the outgoing air duct or corresponds to other incoming air ducts, the outgoing air duct in the actual air duct pipe fitting 10 is blocked and the air path is blocked, and the function of normally guiding the air flow cannot be realized.

[0036] In one embodiment, the circumferential surface of the commutation valve body 20 has an annular groove 22 extending in the circumferential direction, and transmission teeth are arranged in the groove 22 to form an external gear ring, and the transmission component 31 is a gear that cooperates with the external gear ring.

[0037] Specifically, as shown in the attached drawing Figure 1 and Figure 2 shown, the commutation valve body 20 and the commutation power component 30 are mutually matched and driven through a gear and external gear ring mechanism, wherein the external gear ring is arranged in the groove 22 on the circumferential surface of the commutation valve body 20, and the transmission component 31 of the gear cooperates with the external gear ring for transmission.

[0038] In one embodiment, the commutation power component 30 is arranged on the outer wall of the first flow channel 11, and an opening 111 corresponding to the transmission component 31 is provided on the wall surface of the first flow channel 11 for the transmission component 31 to pass through and cooperate with the commutation valve body 20.

[0039] Specifically, as shown in the attached drawing Figure 1 shown, the commutation power component 30 is arranged in the housing, the housing is fixed on the outer wall surface of the first flow channel 11, and an opening 111 is provided on the wall surface of the first flow channel 11. The transmission component 31 passes through the opening 111 to cooperate with the commutation valve body 20. Specifically, the transmission component 31 adopts a gear, and the commutation valve body 20 has an external gear ring arranged in the groove 22. In this way, when the gear meshes with the external gear ring, the tooth part of the gear is mutually limited with the groove wall of the groove 22, thereby playing a positioning function for the commutation valve body 20.

[0040] Furthermore, the power source of the commutation power component 30 is a commutation motor 32, the power output end of the commutation motor 32 is connected to the transmission component 31, and the commutation motor 32 adopts a servo motor 32 that can be automatically controlled.

[0041] In one embodiment, a magnet 23 is arranged on the wall surface on one side of the commutation valve body 20, and the commutation power component 30 has a Hall sensor capable of sensing the magnetic field intensity of the magnet 23.

[0042] Specifically, according to the Hall effect, a Hall sensor (not shown in the drawings) can sense the intensity of the magnetic field generated by the magnet 23. Since the Hall sensor is stationary and the intensity of the magnetic field generated by the magnet 23 itself is also constant and it can move with the commutation valve body 20, the relative position of the magnet 23 can be obtained by sensing the change in the magnetic field intensity of the magnet 23 by the Hall sensor. Based on the fact that the relative position between the magnet 23 and the vent 211 of the commutation valve body 20 is fixed, the orientation of the vent 211 can be determined by the position of the magnet 23, providing a basis for the position and direction of the drive of the commutation power component 30 on the commutation valve body 20.

[0043] Preferably, the magnet 23 is disposed on the side where the vent 211 is located, or the magnet 23 is disposed on the other side relative to the side where the vent 211 is located.

[0044] Specifically, the magnet 23 is arranged to correspond to the side where the vent 211 is located or the other side relative to the side where the vent 211 is located, which can simplify the judgment of the orientation of the vent 211. For example, when the Hall sensor senses the maximum magnetic field intensity of the magnet 23, it proves that the magnet 23 is located on the side closest to the Hall sensor, then the vent 211 faces the side where the Hall sensor is located. Similarly, when switching the orientation of the vent 211, whether the rotation direction of the commutation valve body 20 is correct and whether the rotational movement is in place can be judged by the magnetic field intensity of the magnet 23 obtained by the Hall sensor.

[0045] In one embodiment, the commutation power component 30 further includes an acceleration sensor, and the acceleration sensor can sense the movement direction of the electrical device where the switching device is located to control the drive of the commutation power component 30 on the commutation valve body 20.

[0046] Specifically, when the air duct switching device is applied to a specific electrical device, the switching of the air duct can be automatically controlled according to the movement direction of the electrical device. For example, in the above-mentioned vacuum cleaner, the acceleration sensor (not shown in the drawings) can sense the current movement direction of the vacuum cleaner and issue a switching command to control the commutation power component 30 to drive the commutation valve body 20 to rotate to the flow path where the vent 211 corresponds to the current movement direction side; after receiving the switching command, the commutation motor 32 drives the commutation valve body 20 to rotate for air duct switching, and the actual rotation accuracy of the commutation valve body 20 is controlled based on the induction of the magnetic field intensity of the magnet 23 on the commutation valve body 20 by the Hall sensor.

[0047] Further, as shown in the drawings Figure 1The cleaning head of the vacuum cleaner equipped with the air duct switching device as shown. When it is detected by the Hall sensor that the direction of the ventilation opening 211 is consistent with the moving direction of the cleaning head, the commutation motor 32 does not operate and the posture of the commutation valve body 20 remains unchanged. When it is detected by the Hall sensor that the direction of the ventilation opening 211 is inconsistent with the moving direction of the cleaning head, the commutation motor 32 starts to operate, drives the commutation valve body 20 to rotate a predetermined angle, and stops operating after the direction of the ventilation opening 211 is consistent with the moving direction of the cleaning head.

[0048] In one embodiment, the outer contour of the ventilation opening 211 projects as a circle on the cross-section of the corresponding flow channel, and the size of the circle is the same as the size of the cross-section of the flow channel.

[0049] Specifically, the ventilation opening 211 matches the size of the cross-section of the flow channel, avoiding blocking the airflow passing through the flow channel and ensuring the normal function of the corresponding electrical equipment.

[0050] An embodiment of the present invention provides a cleaning head, which includes the above-mentioned air duct switching device and an air duct tee. The air duct tee has two air inlet flow channels and one air outlet flow channel, and the air duct switching device is arranged in the air outlet flow channel.

[0051] Specifically, as shown in the attached drawing Figure 1 The cleaning head of the vacuum cleaner as shown. Its air duct fitting 10 is an air duct tee, including two air inlets as dust suction ports and one air outlet flow channel (dust collection flow channel) where the air duct switching device is located. Rotating brushes 40 are respectively corresponding to the two air inlets 101. According to the moving direction of the cleaning head sensed by the acceleration sensor (the moving direction is towards the side where one of the air inlets 101 is located), the commutation motor 32 of the commutation power component 30 drives the commutation valve body 20 to rotate and accurately controls the commutation valve body 20 to rotate to the flow channel where the air inlet 101 is located on the side corresponding to the moving direction of the cleaning head of the ventilation opening 211 with reference to the position information obtained by the Hall sensor.

[0052] It should be noted that the diameters of the three flow channels of the air duct tee of the vacuum cleaner cleaning head are the same. Based on the structure of this cleaning head, if the number of flow channels corresponding to the air inlet 101 is further increased, due to the characteristics of the physical structure, the diameter of the first flow channel 11 will be larger than the diameter of the flow channel corresponding to the air inlet 101.

[0053] In addition, actually in the attached drawing Figure 1The cleaning head structure shown (excluding the roller brush 40 part) can also be directly applied to other electrical devices, such as a hair dryer. The first flow channel 11 where the air duct switching device is located can be used as an air inlet flow channel or an air outlet flow channel. When the first flow channel 11 is used as the air inlet flow channel, it corresponds to a hair dryer with multiple air outlets. The air duct switching device can switch the air outlet duct, that is, switch the air outlet direction. When the first flow channel 11 is used as the air outlet flow channel, it corresponds to a hair dryer with multiple air sources. The air duct switching device can switch the air inlet duct to correspond to different air sources, realizing the switching of air sources. The air sources can have different air types (cold air, hot air, fresh air, etc.), wind speeds, and air volumes and other parameters.

[0054] An embodiment of the present invention provides a vacuum cleaner, including the above-mentioned cleaning head, and thus having all the technical effects possessed by it.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0056] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not deviate from the spirit and scope of the present invention defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. An air duct switching device, characterized in that, It is disposed in a duct fitting, and the duct fitting has a plurality of flow channels with different directions and converging at a point. The switching device includes: A reversing valve body disposed in a first flow channel among the plurality of flow channels. One end of the reversing valve body is a reversing blocking end located at the convergence point of the plurality of flow channels. The reversing blocking end is a semi-closed structure with a ventilation opening on one side. A reversing power component, which includes a transmission assembly that cooperates with the reversing valve body. The transmission assembly can drive the reversing valve body to rotate circumferentially to switch the flow channel corresponding to the ventilation opening by rotation. Wherein, a circumferentially extending annular groove is provided on the circumferential surface of the reversing valve body, and a transmission tooth is provided in the groove to form an external gear ring. The transmission assembly is a gear that cooperates with the external gear ring. The reversing power component is disposed on the outer wall of the first flow channel, and an opening corresponding to the transmission assembly is provided on the wall surface of the first flow channel for the transmission assembly to pass through and cooperate with the reversing valve body. Among the plurality of flow channels, there are two types of flow channels, namely an air inlet flow channel and an air outlet flow channel. The first flow channel is the only air inlet flow channel or air outlet flow channel.

2. The air duct switching device according to claim 1, wherein A magnet is provided on the wall surface on one side of the reversing valve body, and a Hall sensor capable of sensing the magnetic field strength of the magnet is provided in the reversing power component.

3. The air duct switching device according to claim 2, characterized in that, The magnet is provided on the side where the ventilation opening is located, or the magnet is provided on the other side relative to the side where the ventilation opening is located.

4. The air duct switching device according to claim 2, wherein An acceleration sensor is further provided in the reversing power component. The acceleration sensor can sense the movement direction of the electrical equipment where the switching device is located to control the driving of the reversing power component on the reversing valve body.

5. The air duct switching device according to claim 1, characterized in that, The outer contour of the ventilation opening is circular when projected onto the cross-section of the flow channel it can correspond to, and the size of the circle is the same as the size of the cross-section of the flow channel.

6. A cleaning head, characterized in that, Including the duct switching device according to any one of claims 1 to 5; and A duct tee, which has two air inlet flow channels and one air outlet flow channel. The duct switching device is disposed in the air outlet flow channel.

7. A vacuum cleaner, characterized in that, Including the cleaning head according to claim 6.

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