Hard surface cleaning equipment and suction nozzle assembly thereof

Abstract

The present invention relates to a suction nozzle assembly for a hard surface cleaning device for scraping and drawing liquid from a hard surface, the hard surface cleaning device comprising a suction flow path for connection to the suction nozzle assembly, the suction nozzle assembly comprising: a lower housing comprising a receptacle defining an internal suction channel, the insertion part can be detachably connected to the hard surface cleaning equipment so as to be in fluid communication with the suction flow path; the upper shell body is detachably connected to the lower shell body; the upper scraping part is used for executing scraping operation; the middle retaining part is located between the lower shell and the upper shell, the middle retaining part and the lower shell form a suction space communicated with fluid of the internal suction channel, and the upper scraping part is located between the middle retaining part and the upper shell. The invention also relates to a hard surface cleaning device comprising such a nozzle assembly.

Description

Technical Field

[0001] This invention relates to the field of surface cleaning, and more specifically, to a hard surface cleaning apparatus comprising a suction assembly for forming a suction flow, a nozzle assembly in fluid communication with the suction assembly for drawing in a liquid-air mixture, a separation assembly for separating liquid from the drawn-in liquid-air mixture, and a reservoir for containing the separated liquid. The invention also relates to a nozzle assembly for a hard surface cleaning apparatus. Background Technology

[0002] Hard surface cleaning equipment is a device used to clean hard surfaces such as glass. It automatically absorbs wastewater and dirt generated during the cleaning process, ensuring the hard surface is clean and streak-free.

[0003] This hard surface cleaning device can be used to clean surfaces such as floors or tabletops, tiled walls, or glass surfaces, especially window glass. The device can be guided along the surface to be cleaned and has a nozzle assembly in fluid communication with a suction component for drawing in a liquid-air mixture. The suction component generates a suction airflow, which, under the action of the suction airflow, draws in the liquid-air mixture, for example, from the surface to be cleaned or from the nozzle assembly at the contact surface of the hard surface cleaning device. The nozzle assembly includes, for example, a scraper to remove dirt from the surface to be cleaned.

[0004] The squeegee of the nozzle assembly is typically made of rubber or similar materials and is used to wipe away dirt, dust, and water stains from glass surfaces. Over time, the squeegee blade may gradually wear down due to prolonged and frequent use, rendering it ineffective at cleaning glass and potentially causing it to fail. Additionally, the squeegee can age after prolonged exposure to air and sunlight, losing its elasticity and toughness, thus affecting cleaning performance. Furthermore, if the squeegee comes into contact with hard objects on the glass (such as sand or particulate dust) during cleaning, scratches may appear on its surface, affecting cleaning effectiveness. If a large amount of dirt accumulates on the squeegee's surface, it may impair its cleaning ability and even re-impose dirt onto the glass during the cleaning process. Therefore, to ensure the cleaning effectiveness of hard surface cleaning equipment and extend its lifespan, it is essential to regularly inspect and replace the nozzle assembly and its squeegee. This helps maintain the cleaning effect of the hard surface cleaning equipment, restores its optimal cleaning performance, protects the glass from scratches or other damage during cleaning, and contributes to extending the overall lifespan of the hard surface cleaning equipment.

[0005] In some applications, different types of nozzle assemblies or scrapers may be needed to provide better cleaning performance for different scenarios. Using multiple different hard surface cleaning devices with varying nozzle assemblies can be expensive or impractical. Therefore, a modular design for the nozzle assemblies can be considered, allowing them to be assembled and disassembled independently of the rest of the hard surface cleaning device. This design makes the nozzle assemblies independent modules that users can replace or clean as needed, further reducing costs.

[0006] Therefore, there is still a need in the art for an improved hard surface cleaning device and its nozzle assembly that facilitates good cleaning results, wherein the nozzle assembly of the hard surface cleaning device can be easily disassembled and replaced, especially without tools, and ensures good cleaning results and extends the overall service life of the hard surface cleaning device. Summary of the Invention

[0007] One of the objectives of this application is to provide a hard surface cleaning device and its nozzle assembly, which can be easily disassembled and replaced, especially without tools, and ensures good cleaning effect of the hard surface cleaning device and extends the overall service life of the hard surface cleaning device.

[0008] To address the aforementioned technical problems, in one aspect of this application, a suction nozzle assembly for a hard surface cleaning device is provided for scraping and aspirating liquid from a hard surface. The hard surface cleaning device includes a suction flow path for connection to the suction nozzle assembly, and the suction nozzle assembly includes:

[0009] The lower housing includes a connector defining an internal suction channel, the connector being detachably connected to the hard surface cleaning device for fluid communication with the suction flow path;

[0010] An upper housing, which is detachably connected to the lower housing;

[0011] Upper scraper, the upper scraper being used to perform a scraping operation; and

[0012] An intermediate retainer is located between the lower housing and the upper housing, the intermediate retainer and the lower housing forming a suction space that is in fluid communication with the internal suction channel, and the upper scraper is located between the intermediate retainer and the upper housing.

[0013] In one embodiment of the invention, the nozzle assembly has a longitudinal central axis, and the nozzle assembly is symmetrically constructed about the longitudinal central axis.

[0014] In one embodiment of the invention, the nozzle assembly further includes a lower scraper that is connected to or integrally formed with the lower housing.

[0015] In one embodiment of the invention, the upper scraper is shaped like a generally planar body and includes a widened clamping portion extending along its length, with the upper housing and the intermediate retainer each having a recessed portion for fitting the clamping portion into the recessed portion in a shape-fitting manner.

[0016] In one embodiment of the invention, the insertion portion defines a circumferential groove on its outer peripheral surface, a sealing element is disposed in the circumferential groove, and the height of the sealing element in the radial direction is greater than the depth of the circumferential groove.

[0017] In one embodiment of the invention, the circumferential groove includes a plurality of circumferential grooves spaced apart from each other in an axial direction, and a corresponding number of sealing elements are disposed in the circumferential grooves.

[0018] In one embodiment of the invention, the lower housing includes a downwardly extending protrusion that forms a stop to prevent the nozzle assembly from detaching from the hard surface cleaning device when the nozzle assembly is inserted into the hard surface cleaning device.

[0019] In one embodiment of the invention, the lower housing and / or the intermediate retainer includes a flow guide rib located in the suction space, the flow guide rib being configured to abut against the intermediate retainer and / or the lower housing.

[0020] In one embodiment of the invention, the flow guide rib includes a centrally formed V-shaped guide rib for diverting fluid to both sides.

[0021] In one embodiment of the invention, the flow guide ribs are arranged symmetrically about the longitudinal central axis of the nozzle assembly, and the flow guide ribs are distributed in a generally fan-shaped pattern.

[0022] In one embodiment of the invention, the flow guide rib includes a radial extension and an axial extension, the axial extension being parallel to the longitudinal central axis of the nozzle assembly; preferably, the lengths of the axial extensions of the flow guide rib are substantially equal, or the lengths of the axial extensions increase from the center outwards.

[0023] In one embodiment of the invention, one of the lower housing and / or the intermediate retainer includes a baffle formed as a side of the suction space.

[0024] In one embodiment of the invention, the lower housing and / or the other of the intermediate retainer includes a groove on its inner side, into which the flange can be inserted to prevent leakage of the liquid-air mixture from the flange.

[0025] In one embodiment of the invention, the free end of the lower scraper is configured as a wave shape or corrugated portion; preferably, the upper scraper and / or the lower scraper includes a protrusion to separate the upper scraper and the lower scraper.

[0026] In another aspect of this application, a hard surface cleaning device is provided, comprising:

[0027] The suction nozzle assembly as described above;

[0028] A suction assembly for forming a suction flow, the suction assembly including suction blades and an electric motor for driving the suction blades;

[0029] The suction flow path located between the nozzle assembly and the suction assembly; and

[0030] Storage tanks used to contain the separated liquid;

[0031] The nozzle assembly is in fluid communication with the suction assembly via the suction flow path.

[0032] In another embodiment of the invention, the housing of the hard surface cleaning device has an upwardly extending bulge that forms a stop to prevent the nozzle assembly from detaching from the hard surface cleaning device when the nozzle assembly is inserted into the hard surface cleaning device.

[0033] In the embodiments of this application, the hard surface cleaning device and its nozzle assembly according to the present invention can be easily disassembled and replaced, especially without tools, and the good cleaning effect of the hard surface cleaning device and the overall service life of the hard surface cleaning device are guaranteed. Attached Figure Description

[0034] The objects and features of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings. However, it should be understood that the drawings are for illustrative purposes only and are not intended to limit the invention.

[0035] Figure 1 This is a perspective view of a hard surface cleaning device according to an embodiment of the present invention.

[0036] Figure 2 This is a cross-sectional view of a hard surface cleaning device according to an embodiment of the present invention.

[0037] Figure 3This is according to an embodiment of the present invention. Figure 2 A partially enlarged cross-sectional view of the hard surface cleaning device shows the nozzle assembly of the hard surface cleaning device more clearly.

[0038] Figure 4 This is a perspective view of the nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, viewed from below.

[0039] Figure 5 This is an exploded perspective view of the suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, viewed from above.

[0040] Figure 6 This is an exploded perspective view of the nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, viewed from below.

[0041] Figure 7 This is a three-dimensional cross-sectional view of the suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, cut along its central axis.

[0042] Figure 8 This is a cross-sectional view of the suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, cut along its central axis.

[0043] Figure 9 The suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention is along Figure 4 The cross-sectional view cut by line AA in the figure.

[0044] Figure 10 This is a front plan view of the upper and lower scraping parts of the suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, when they are in contact with each other.

[0045] Figure 11 This is an exploded perspective view of the nozzle assembly of a hard surface cleaning device according to another embodiment of the present invention, viewed from below. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0048] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] The various specific technical features and embodiments described in the detailed implementation can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / implementations / implementation methods. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / implementations / implementation methods in this application will not be described separately.

[0050] Various embodiments of a hard surface cleaning device according to the invention are schematically illustrated in the accompanying drawings, which are generally indicated by reference numeral 1000. In the illustrated embodiments, the hard surface cleaning device 1000 is designed as a manually guided hard surface cleaning device, which can draw liquid from hard surfaces, such as window glass, table surfaces, or, for example, also from tiled walls or shower walls or glass.

[0051] In one embodiment of the present invention, a hard surface cleaning device 1000 includes a suction assembly for forming a suction flow, a nozzle assembly 3 in fluid communication with the suction assembly for drawing a liquid-air mixture, a suction flow path located between the nozzle assembly 3 and the suction assembly, a separation component 500 for separating liquid from the drawn liquid-air mixture, and a reservoir 2 for containing the separated liquid. In this embodiment, the suction flow path includes a receiving chamber 200 between the nozzle assembly 3 and the separation component 500, the receiving chamber 200 being independent of the housing 1 of the hard surface cleaning device 1000. The reservoir 2 for containing the liquid separated from the separation component 500 is detachably held within the housing 1. In one embodiment, the reservoir 2 is made of a transparent material so that a user can observe how much liquid is stored in the reservoir 2.

[0052] like Figure 1As shown, the hard surface cleaning device 1000 includes a housing 1. A suction nozzle assembly 3 and a liquid reservoir 2 are detachably held on the housing 1. In one embodiment of the invention, the housing 1 includes a left half-shell 11 and a right half-shell 12. In one embodiment of the invention, the housing 1 is configured with a handle 5, which, during operation, allows a user to hold with one hand to guide the hard surface cleaning device 1000 along the surface to be cleaned. In one embodiment of the invention, a switch 6 is provided at the upper part of the handle 5, which the user can activate by pressing the switch 6, for example, with their thumb. In one embodiment of the invention, the housing 1 preferably also houses at least one rechargeable battery 4, particularly a lithium-ion battery, which supplies energy to the suction assembly. In one embodiment of the invention, the housing 1 may also include a charging port (not shown) for charging the hard surface cleaning device 1000's battery when needed. In one embodiment of the invention, the housing 1 further includes a discharge opening 13 to facilitate the discharge of air or gas drawn in by the hard surface cleaning device 1000 into the surrounding environment. Figure 1 As shown, the housing 1 also includes a textured portion 111 located at the rear end of the motor 120, which is used to indicate to the user that the motor 120 is located at this location.

[0053] Figure 2 This is a cross-sectional view of a hard surface cleaning device 1000 according to an embodiment of the present invention. In one embodiment of the invention, a suction assembly is arranged above the handle 5 in the housing 1. The suction assembly includes a suction turbine or blade 110 and an electric motor 120 that drives the suction turbine 110. The suction assembly is capable of suctioning air, such that the suctioned air, as well as liquids and even solid dirt, can be drawn into a suction flow path (e.g., receiving chamber 200) via the suction nozzle assembly 3, separated from the separation component 500, and discharged to the surrounding environment via the discharge opening 13 through the suction turbine 110. In one embodiment of the invention, the suction assembly further includes a suction housing 130 that surrounds and supports the suction turbine 110 and the electric motor 120. In one embodiment of the invention, the suction housing 130 includes a throat 135 that is hermetically connected to the receiving chamber 200 on its outer periphery.

[0054] Figure 3 This is according to an embodiment of the present invention. Figure 2A partially enlarged cross-sectional view of the hard surface cleaning device 1000 shows the nozzle assembly 3 of the hard surface cleaning device 1000 more clearly. The receiving chamber 200 includes a receiving section 210 for receiving the nozzle assembly 3. In one embodiment of the invention, the receiving section 210 further includes a receiving tube section 211 for receiving the insertion portion 311 of the nozzle 3 to receive the liquid-air mixture drawn from the nozzle 3 into the receiving chamber 200, as will be described below.

[0055] Figure 4 This is a perspective view from below of the nozzle assembly 3 of a hard surface cleaning device 1000 according to an embodiment of the present invention. Figure 5 This is an exploded perspective view of the nozzle assembly 3 of a hard surface cleaning device 1000 according to an embodiment of the present invention, viewed from above. Figure 6 This is an exploded perspective view of the nozzle assembly 3 of a hard surface cleaning device 1000 according to an embodiment of the present invention, viewed from below.

[0056] exist Figure 4 The image shows a suction nozzle assembly 3 having a longitudinal central axis X. In one embodiment of the invention, the suction nozzle assembly 3 is constructed symmetrically about the longitudinal central axis X, as shown below. Figure 4 It is shown schematically.

[0057] Continue to refer to Figure 4-6 The nozzle assembly 3 includes a lower housing 31, an upper housing 35, and a scraper located between the lower housing 31 and the upper housing 35. In one embodiment of the invention, the nozzle assembly 3 includes a lower scraper 32 and an upper scraper 34. In another embodiment of the invention, the nozzle assembly 3 further includes an intermediate retainer 33 located between the lower housing 31 and the upper housing 35. In one embodiment of the invention, the lower housing 31, the first scraper 32, and the intermediate retainer 33 can be molded as a single piece, that is, together forming the lower housing 31. In one example, the lower housing 31 and the first scraper 32 are constructed as a single piece, for example by injection molding using a plastic containing two different components, resulting in a single piece having a lower housing 31 composed of a relatively hard component and a lower scraper 32 composed of a relatively soft component. For example, the lower scraper 32 is made of an elastomeric material.

[0058] In embodiments of the invention, the lower housing 31 and the upper housing 35 are detachably connected. For example, they can be configured such that the lower housing 31 and the upper housing 35 can be screwed together or locked in a detachable manner. In a preferred embodiment, the lower housing 31 and the upper housing 35 each have a groove and a protrusion at their interface to achieve a good seal at the interface. For example, as... Figure 9As shown, the upper housing 35 includes a groove 354 at the interface, and the lower housing 31 includes a protrusion 314 at the interface. When the lower housing 31 and the upper housing 35 are assembled together, for example by fasteners such as screws 300, the protrusion 314 is inserted into the groove 354, thereby aligning the lower housing 31 and the upper housing 35 with each other and achieving a good seal at the interface. This prevents the liquid-air mixture from leaking out from the interface between the lower housing 31 and the upper housing 35, thus improving the sealing effect.

[0059] Continue to refer to Figure 4-6 The nozzle assembly 3 includes a connector 311 defining an internal suction channel 30 for conveying a liquid-air mixture scraped from the surface to be cleaned through the suction channel 30. In one embodiment, a circumferential groove 312 is defined on the outer peripheral surface of the connector 311, such as an O-ring sealing element 230 (see...). Figure 3 The sealing element 230 is disposed in the circumferential groove 312, and the height of the sealing element 230 in the radial direction is greater than the depth of the circumferential groove 312, so as to facilitate the sealing installation of the nozzle assembly 3 to the suction assembly and easy removal from the suction assembly. In one embodiment of the invention, the insertion portion 311 is completely formed in the lower housing 31. In one embodiment, the insertion portion 311 is formed in the shape of a flat tube, such as... Figure 5-7 As shown. Because the insertion portion 311 is formed integrally, rather than by connecting two parts (e.g., two half-shells), this facilitates easy modular manufacturing. The insertion portion 311 has a stable shape and can be easily inserted into the receiving portion 210 of the receiving chamber 200, particularly into the receiving tube portion 211. In one embodiment of the invention, the inner wall surface of the receiving tube portion 211 is smooth to facilitate easy insertion of the insertion portion 311. In one embodiment of the invention, when the insertion portion 311 is inserted into the receiving portion 210, the distance between the insertion portion 311 and the inner wall surface of the receiving tube portion 211 is less than the height of the sealing element, such that the sealing element is compressed and deformed between the insertion portion 311 and the receiving tube portion 211. In one embodiment of the invention, the insertion portion 311 includes a circumferential groove 312 near its free end, on which a sealing element 230, such as an O-ring, is disposed. In other embodiments, the insertion portion 311 includes a plurality of spaced-apart circumferential grooves 312, each circumferential groove 312 being provided with a sealing element 230, such as an O-ring. Providing a plurality of circumferential grooves 312 and sealing elements 230 helps to further improve the sealing performance between the insertion portion 311 and the receiving portion 210.

[0060] Reference Figure 3 The suction nozzle assembly 3 includes an abutment portion located on the outer periphery of the insertion portion 311. In one embodiment of the invention, as... Figure 3 and 6 As shown, the abutment portion includes a lower abutment portion 319 located on the lower housing 31 and an upper abutment portion 359 located on the upper housing 35. The lower abutment portion 319 and the upper abutment portion 359 are formed in a saddle shape around the insertion portion 311 to facilitate the secure insertion of the suction nozzle assembly 3 into the housing of the hard surface cleaning device 1000. In one embodiment of the invention, reference is made to... Figure 3 The housing of the hard surface cleaning device 1000 has an upwardly extending protrusion 118. In one embodiment of the invention, the protrusion 118 is configured to form a stop that prevents the suction assembly 3 from detaching from the hard surface cleaning device 1000 when the suction assembly is inserted into the hard surface cleaning device. In a preferred embodiment, the uppermost free end of the protrusion 118 is rounded.

[0061] Figure 7 This is a three-dimensional cross-sectional view of the nozzle assembly 3 of a hard surface cleaning device 1000 according to an embodiment of the present invention, cut along the central axis X. Figure 8 This is a cross-sectional view of the nozzle assembly 3 of a hard surface cleaning device 1000 according to an embodiment of the present invention, taken along the central axis X. The lower housing 31 includes a downwardly extending protrusion 318. When the nozzle assembly 3 is inserted into the hard surface cleaning device 1000, the protrusion 318 forms a stop to prevent the nozzle assembly 3 from becoming detached from the hard surface cleaning device 1000. In a preferred embodiment, the lowermost free end of the protrusion 318 is rounded. (See reference...) Figure 7-8When the nozzle assembly 3 is inserted into the hard surface cleaning device 1000, the insertion portion 311 of the nozzle assembly 3 slides along the inner wall of the receiving portion 210 of the receiving chamber 200. In a preferred embodiment, the upward extension length of the raised portion 118 and the downward extension length of the protrusion 318 are such that when the protrusion 318 passes the raised portion 118 in the insertion direction, the protrusion 318 contacts the raised portion 118 and both slightly deform, causing the protrusion 318 to slide over the raised portion 118 until the abutment portion of the nozzle assembly 3 abuts against the housing of the hard surface cleaning device 1000. At this time, the protrusion 318 slides over the raised portion 118, which constitutes a stop portion of the nozzle assembly 3 to prevent the nozzle assembly 3 from accidentally detaching or loosening from the hard surface cleaning device 1000. This further ensures that the nozzle assembly 3 is reliably held on the hard surface cleaning device 1000 during use. In this embodiment, the protrusion 118 functions as a hook to hold the nozzle assembly 3 on the hard surface cleaning device 1000. Of course, other structures are also conceivable for holding the nozzle assembly 3 on the hard surface cleaning device 1000.

[0062] Continue to refer to Figure 4-6 To scrape liquid from the hard surface to be cleaned, the nozzle assembly 3 has an upper scraper 34 and a lower scraper 32 in the area of ​​the suction opening. In one embodiment of the invention, the upper scraper 34 is a replaceable scraper 34, and the lower scraper 32 is a non-replaceable scraper 32. The non-replaceable scraper 32 includes a plurality of comb teeth 321 at its end to facilitate liquid flow. The non-replaceable scraper 32 is formed onto the lower housing 31 and together with the lower housing 31 forms a co-injection molded part having two components, namely, the hard component forming the lower housing 31 and the elastomeric component forming the non-replaceable scraper 32. In one embodiment of the invention, the replaceable scraper 34 is symmetrical about the central plane P, which is substantially parallel to the longitudinal central axis X of the nozzle assembly 3, and has a clamping portion, such as... Figure 8 As shown. In one embodiment of the invention, the clamping portion is wider than the generally planar body of the scraper 34. The clamping portion is used to clamp the scraper 34 into place within the suction nozzle assembly 3. In one embodiment of the invention, the clamping portion is formed by a ridge 341 that is substantially circular in cross-section. The clamping portion 341 extends along the total length of the replaceable scraper 34 and forms the rear end region of the replaceable scraper. The front end region of the replaceable scraper 34 is formed by a first scraping edge 342 and a second scraping edge 343, which extend along one end of the replaceable scraper 34 away from the clamping portion 341.

[0063] like Figure 4-6 As shown, to secure the replaceable scraper 34, the upper housing 35 and the intermediate retainer 33 are respectively provided with recesses 351 and 333. The clamping part 341 is configured to be form-fitted and locked into the recesses 351 and 333 during assembly of the suction nozzle assembly 3. Because the diameter of the clamping part 341 is larger than the distance between the upper housing 35 and the intermediate retainer 33, the clamping part 341 is clamped between the recesses 351 and 333 and will not be pulled out along the direction of the intermediate plane P.

[0064] In one embodiment of the invention, one or more flow guide ribs 332 are centrally disposed on the surface of the intermediate retainer 33 facing the non-replaceable scraper 32. In another embodiment, the flow guide ribs 332 are configured to abut against the lower housing 31 and / or the lower scraper 32 during assembly of the nozzle assembly 3, thereby providing support and retention for a more stable suction nozzle assembly 3. In another embodiment, these separately arranged flow guide ribs 332 are generally arranged in a fan-like shape, such that the greater the distance between the flow guide ribs 332 and the longitudinal axis X of the suction nozzle assembly 3, the greater the inclination of the flow guide ribs 332 relative to the longitudinal axis X. Figure 6 Six flow guide ribs 332 are shown, but those skilled in the art will recognize that more or fewer flow guide ribs 332 can be provided. In one embodiment of the invention, the flow guide rib 332 includes a radial extension and an axial extension, the axial extension being parallel to the longitudinal central axis of the nozzle assembly. In a preferred example, the lengths of the axial extensions of the flow guide ribs are substantially equal, or the lengths of the axial extensions increase from the center outwards.

[0065] In one embodiment of the invention, the intermediate retainer 33 further includes a suction inlet 335. When the nozzle 3 is assembled, the suction inlet 335 is located near the insertion portion 311 of the nozzle 3.

[0066] In one embodiment of the invention, a suction space is created between the intermediate retainer 33 and the lower housing 31 to facilitate the flow of the liquid-air mixture from the suction space into the suction channel 30.

[0067] In one embodiment of the invention, the lower housing 31 and / or the intermediate retainer 33 include a flow guide rib 332 located in the suction space, the flow guide rib 332 being configured to abut against the intermediate retainer 33 and / or the lower housing 31.

[0068] The flow guide ribs 332 help support the intermediate retainer 33 and the non-replaceable scraper 32, and also enable the suction flow to be guided with very low flow loss, so that the mixture of liquid and suction air can flow between the flow guide ribs 332 with very little flow loss, through the suction inlet 335, and then into the suction channel 30.

[0069] During surface cleaning, a replaceable scraper 34 occupies, for example, a first use position in which the first scraping edge 342 faces the non-replaceable scraper 32, for example... Figure 8 As shown. When cleaning a hard surface, the first scraping edge 342 is guided along the hard surface to be cleaned in the first use position. In particular, the first scraping edge 342 may wear down when the hard surface is rough or after many uses. When the maximum wear is reached, the cleaning effect achievable by the first scraping edge 342 may be affected. Then, the user can pull out the replaceable scraper 34 in the lateral direction in the intermediate plane P, flip the scraper 34 180 degrees, and then insert the scraper 34 between the upper housing 35 and the intermediate retainer 33 and fix it in place. At this time, the replaceable scraper 34 occupies a second use position (not shown), in which the second scraping edge 343 faces the non-replaceable scraper 32 and can be guided along the hard surface to be cleaned. Therefore, the lifespan of the replaceable scraper 34 can be significantly extended, for example, even almost doubled.

[0070] According to an advantageous embodiment of the invention, the replaceable scraper is reliably held at the suction opening not only in the first use position but also in the second use position, and very good cleaning results can be achieved in both use positions by means of the replaceable scraper.

[0071] Figure 9 The suction assembly 3 of the hard surface cleaning device 10000 according to an embodiment of the present invention is along... Figure 4 The cross-sectional view is shown by line AA. (Continue to refer to...) Figure 4-9 On the surface of the intermediate retainer 33 facing the lower housing 31, a side flange 331 extending toward the lower housing 31 is provided on its side. The side flange 331 forms the side of the suction space to facilitate guiding the liquid-air mixture into the suction channel 30. In one embodiment of the invention, as... Figure 9As shown, the lower housing 31 includes a groove 313 located on its inner side. The groove 313 is complementary in shape to or conforms to the flange 331, so that when the nozzle assembly 3 is installed, the flange 331 can be inserted into the groove 313 to form a preferably arcuately curved sidewall between the lower housing 31 and the intermediate retainer 33, allowing a suction space for the liquid-air mixture to pass through, and preventing leakage of the liquid-air mixture from the flange 331. In one embodiment of the invention, the flange 331 extends continuously from near the central axis X to the side of the intermediate retainer 33. In one embodiment of the invention, the intermediate retainer 33 further includes a side stop 334 extending toward the lower housing 31 on its side. In one embodiment of the invention, the flange 331 and the side stop 334 are continuous, thereby preventing liquid from flowing out from the side of the intermediate retainer 33. In one embodiment of the present invention, the stop 331 and the side stop 334 can form an integral stop, and are integrally formed on the intermediate retainer 33.

[0072] In one embodiment of the invention, one of the lower housing 31 and / or the intermediate retainer 33 includes a flange formed as a side of the suction space. The other of the lower housing 31 and / or the intermediate retainer 33 includes a groove on its inner side, into which the flange can be inserted to prevent leakage of the liquid-air mixture from the flange.

[0073] In one embodiment of the invention, the non-replaceable scraper 32 includes a protrusion 322 on the comb teeth 321 extending toward the replaceable scraper 34 to separate the non-replaceable scraper 32 from the replaceable scraper 34 and to create a suction space to facilitate the flow of the liquid-air mixture from the suction space into the suction channel 30. This further contributes to achieving a good cleaning effect. In one embodiment of the invention, the upper scraper 34 and / or the lower scraper 32 include a protrusion to separate the upper scraper 34 and the lower scraper 32.

[0074] Figure 10This is a front plan view of the upper scraper 34 and lower scraper 32 of the suction nozzle assembly of a hard surface cleaning device according to an embodiment of the present invention, when they are in contact with each other. In this alternative embodiment, the free end of the lower scraper 32 is provided with a wavy shape or corrugated portion. In use, when the upper surface of the lower scraper 32 is attached to the lower surface of the upper scraper 34, the lower scraper 32 and the upper scraper 34 are in contact, and a plurality of channels 320 are formed between the corrugated portion of the lower scraper 32 on the upper surface and the lower surface of the upper scraper 34. The plurality of channels 320 lead to the suction space, thereby facilitating the flow of the liquid-air mixture from the surface to be cleaned through the channels 320 into the suction channel 30, which further contributes to achieving a good cleaning effect.

[0075] The flow guide ribs 332 enable the present invention to more effectively draw in liquid-air mixtures and effectively draw in air bubbles. The flow guide ribs 332 effectively improve the suction effect while reducing water streak on the sides during suction. Side water streak is usually caused by the liquid not being effectively drawn away from the edges of the nozzle assembly. During suction, the edge areas may have lower suction due to their greater distance from the suction inlet 335. By properly setting the flow guide ribs 332, the suction can be more evenly distributed across the entire suction nozzle. Experiments have shown that, according to the present invention, setting the flow guide ribs 332 not only improves the suction efficiency of the nozzle assembly 3, resulting in higher flow velocities in the middle and edge areas of the nozzle assembly, but also reduces side water streak caused by edge effects. In one embodiment, the outermost flow guide rib is closer to the suction inlet 335 than the other flow guide ribs. In another embodiment (not shown in the figure), the distance from the suction inlet increases from the outermost flow guide rib to the middle flow guide rib.

[0076] Figure 11 This is an exploded perspective view of the suction nozzle assembly 3 of a hard surface cleaning device according to another embodiment of the present invention, viewed from below. The suction nozzle assembly 3 includes a lower housing 31, an upper housing 35, and a scraper located between the lower housing 31 and the upper housing 35. In one embodiment of the invention, the suction nozzle assembly 3 includes a lower scraper 32 and an upper scraper 34. In one embodiment of the invention, the suction nozzle assembly 3 further includes an intermediate retainer 33 located between the lower housing 31 and the upper housing 35. In one embodiment of the invention, the lower housing 31 and the first scraper 32 are constructed as a single piece, for example, by injection molding using a plastic containing two different components, resulting in a single piece having a lower housing 31 composed of a relatively hard component and a lower scraper 32 composed of a relatively soft component. For example, the lower scraper 32 is made of an elastomeric material. Figure 11 The suction nozzle assembly 3 in the embodiment and Figure 4-6The nozzle assembly 3 in the embodiments is basically the same, except that the intermediate retainer 33 is constructed, which will be described below.

[0077] In one embodiment of the invention, a side flange 331 extending toward the lower housing 31 is provided on the side surface of the intermediate retainer 33 facing the lower housing 31. The side flange 331 forms the side surface of the suction space to facilitate guiding the liquid-air mixture into the suction channel 30. In one embodiment of the invention, the intermediate retainer 33 further includes a side baffle 334 extending toward the lower housing 31 located on its side. In one embodiment of the invention, the side flange 331 and the side baffle 334 are continuous, thereby preventing liquid from flowing out from the side of the intermediate retainer 33. In one embodiment of the invention, the side flange 331 and the side baffle 334 can form an integral side flange and are integrally formed on the intermediate retainer 33. In one embodiment of the invention, the intermediate retainer 33 further includes a suction inlet 335. When the nozzle 3 is assembled, the suction inlet 335 is close to the insertion portion 311 of the nozzle 3.

[0078] like Figure 11 As shown, one or more flow guide ribs 332 are centrally disposed on the surface of the intermediate retainer 33 facing the non-replaceable scraper 32. In one embodiment of the invention, the flow guide ribs 332 are configured to abut against the lower housing 31 and / or the lower scraper 32 during assembly of the nozzle assembly 3, thereby providing support and retention to make the nozzle assembly 3 more stable. In one embodiment of the invention, these separately arranged flow guide ribs 332 are generally arranged in a fan-like shape, such that the greater the distance between the flow guide ribs 332 and the longitudinal axis X of the nozzle assembly 3, the greater the inclination of the flow guide ribs 332 relative to the longitudinal axis X. Figure 11 Two flow guide ribs 332 are shown, but those skilled in the art will know that more or fewer flow guide ribs 332 can be provided.

[0079] like Figure 11As shown, a V-shaped guide rib 336 is formed centered relative to the longitudinal central axis X on the intermediate retainer 33. The V-shaped guide rib 336 is similar to the water-dividing tip of a bridge pier, diverting the liquid-air mixture from both sides. This arrangement of the V-shaped guide rib 336 effectively guides and disperses the liquid-air mixture to both sides after entering the middle of the nozzle 3, thus avoiding the problem of concentrated suction in the middle area caused by direct alignment with the suction port or insertion part 311. The structural design including the V-shaped guide rib 336 significantly improves the uniformity of suction force distribution in the nozzle 3, making the suction force more consistent or uniform across the entire cleaning width, thereby improving cleaning performance and reducing stain residue caused by uneven suction. Furthermore, the V-shaped guide rib 336 can also have a rigid support function, supporting the nozzle 3 together with the flow guide rib 332, side baffle 334, and edge baffle 331 to ensure that the suction space between the intermediate retainer 33 and the lower housing 31 does not deform or become blocked. The included angle between the two legs of the V-shaped guide rib 336 can be between 15 and 70 degrees, or between 15 and 50 degrees, or between 20 and 30 degrees. Those skilled in the art will understand that the included angle can be adjusted according to the distribution of suction force, without departing from the scope of the invention.

[0080] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The scope of this invention is defined by the appended claims rather than the foregoing description, and therefore all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention.

[0081] For those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be considered exemplary and not restrictive.

Claims

1. A suction nozzle assembly for a hard surface cleaning device, used to scrape and aspirate liquid from a hard surface, the hard surface cleaning device including a suction flow path for connection to the suction nozzle assembly, the suction nozzle assembly comprising: The lower housing includes a connector defining an internal suction channel, the connector being detachably connected to the hard surface cleaning device for fluid communication with the suction flow path; An upper housing, which is detachably connected to the lower housing; An upper scraper, the upper scraper being used to perform a scraping operation; as well as An intermediate retainer is located between the lower housing and the upper housing, the intermediate retainer and the lower housing forming a suction space that is in fluid communication with the internal suction channel, and the upper scraper is located between the intermediate retainer and the upper housing.

2. The suction nozzle assembly according to claim 1, wherein, The nozzle assembly has a longitudinal central axis, and the nozzle assembly is constructed symmetrically about the longitudinal central axis.

3. The suction nozzle assembly according to claim 1 or 2, wherein, The suction nozzle assembly also includes a lower scraper, which is connected to or integrally formed with the lower housing.

4. The suction nozzle assembly according to claim 1 or 2, wherein, The upper scraper is shaped like a generally planar body and includes a widened clamping portion extending along its length. The upper housing and the intermediate retainer are respectively provided with recesses for fitting the clamping portion into the recesses in a shaped fit.

5. The suction nozzle assembly according to claim 1 or 2, wherein, The insertion portion defines a circumferential groove on its outer peripheral surface, a sealing element is disposed in the circumferential groove, and the height of the sealing element in the radial direction is greater than the depth of the circumferential groove.

6. The suction nozzle assembly according to claim 5, wherein, The circumferential groove includes a plurality of circumferential grooves spaced apart from each other in an axial direction, and a corresponding number of sealing elements are disposed in the circumferential grooves.

7. The suction nozzle assembly according to claim 5, wherein, The lower housing includes a downwardly extending protrusion that forms a stop to prevent the nozzle assembly from detaching from the hard surface cleaning device when the nozzle assembly is inserted into the hard surface cleaning device.

8. The suction nozzle assembly according to claim 1 or 2, wherein, The lower housing and / or the intermediate retainer include flow guide ribs located in the suction space and configured to abut against the intermediate retainer and / or the lower housing.

9. The suction nozzle assembly according to claim 8, wherein, The flow guide ribs include centrally formed V-shaped guide ribs, which are used to divert fluid to both sides. Preferably, the included angle of the V-shaped guide ribs is between 15 and 70 degrees.

10. The suction nozzle assembly according to claim 8, wherein, The flow guide ribs are arranged symmetrically about the longitudinal central axis of the nozzle assembly, and the flow guide ribs are distributed in a roughly fan shape.

11. The suction nozzle assembly according to claim 8, wherein, The flow guide rib includes a radial extension and an axial extension, the axial extension being parallel to the longitudinal central axis of the nozzle assembly; preferably, the lengths of the axial extensions of the flow guide rib are approximately equal, or the lengths of the axial extensions increase from the center outwards.

12. The suction nozzle assembly according to claim 8, wherein, The outermost flow guide rib is closest to the suction inlet.

13. The suction nozzle assembly according to claim 1 or 2, wherein, One of the lower housing and / or the intermediate retainer includes a baffle that forms a side of the suction space.

14. The suction nozzle assembly according to claim 13, wherein, The lower housing and / or the other of the intermediate retainer includes a groove on its inner side, into which the flange can be inserted to prevent leakage of the liquid-air mixture from the flange.

15. The suction nozzle assembly according to claim 3, wherein, The free end of the lower scraper is configured as a wave shape or a corrugated portion; preferably, the upper scraper and / or the lower scraper includes a protrusion to separate the upper scraper and the lower scraper.

16. A hard surface cleaning device, comprising: The suction nozzle assembly according to any one of claims 1 to 15; A suction assembly for forming a suction flow, the suction assembly including suction blades and an electric motor for driving the suction blades; The suction flow path is located between the nozzle assembly and the suction assembly; as well as Storage tanks used to contain the separated liquid; The nozzle assembly is in fluid communication with the suction assembly via the suction flow path.

17. The hard surface cleaning device according to claim 16, wherein, The housing of the hard surface cleaning device has an upwardly extending bulge that forms a stop to prevent the nozzle assembly from detaching from the hard surface cleaning device when the nozzle assembly is inserted into the hard surface cleaning device.

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