CN221229284U

CN221229284U - Surface cleaning apparatus

Info

Publication number: CN221229284U
Application number: CN202322996193.8U
Authority: CN
Inventors: 冯勇兵; 段风伟; 周键
Original assignee: Dreame Technology Suzhou Co ltd
Current assignee: Dreame Technology Suzhou Co ltd
Filing date: 2023-11-07
Publication date: 2024-06-28
Anticipated expiration: 2033-11-07

Abstract

The utility model discloses a surface cleaning apparatus comprising: the box body is hollow in the interior and is provided with an opening at one end so as to form a containing cavity, and the box body is provided with a sewage inlet pipe; the box cover assembly is arranged at the opening end of the box body, is provided with a separation cavity, and is positioned in the box body and communicated with the accommodating cavity; the sewage outlet of the sewage inlet pipe is positioned in the separating cavity, the separating cavity is communicated with the negative pressure device, the separating cavity is configured to separate non-liquid medium and liquid medium in the sewage, the separating cavity can separate the non-liquid medium in the sewage, and the separated liquid medium is stored in the containing cavity; the surface cleaning equipment is provided with a first working state and a second working state, the backflow prevention air duct is positioned at the upper part of the sewage inlet pipe in the first working state, and the backflow prevention air duct is positioned at the upper part of the box body in the second working state.

Description

Surface cleaning apparatus

Technical Field

The utility model belongs to the technical field of robots, and particularly relates to surface cleaning equipment.

Background

The cleaning apparatus is a mechanical apparatus that can replace manual cleaning work, and is widely used in public place cleaning and home cleaning. The floor washing machine is a cleaning device which is suitable for floor washing and sucking sewage at the same time, and can lead the sewage to be separated from the site, and has the advantages of environmental protection, energy saving, high efficiency and the like. The floor washing machine is provided with a sewage tank for accommodating solid-liquid mixed dirt generated in the cleaning process.

The existing floor washing machine can be cleaned in place after being laid down when the space such as the sofa bottom is cleaned, and in the process, sewage in the sewage tank can enter the negative pressure suction device, so that the risk of burning out the motor exists. Accordingly, there is a need for an improvement over the prior art to overcome the deficiencies described in the prior art.

Disclosure of Invention

Accordingly, the technical problem to be solved by the present utility model is to provide a surface cleaning apparatus.

In order to solve the above technical problems, the present utility model provides a surface cleaning apparatus for cleaning a surface to be cleaned, the surface cleaning apparatus being provided with a negative pressure device for generating negative pressure, comprising: the box body is hollow in the interior and is provided with an opening at one end to form a containing cavity, and the box body is provided with a sewage inlet pipe; the box cover assembly is arranged at the opening end of the box body, and is provided with a separation cavity which is positioned in the box body and communicated with the accommodating cavity; the sewage outlet of the sewage inlet pipe is positioned in the separation cavity, the separation cavity is communicated with the negative pressure device, the separation cavity is configured to separate non-liquid medium and liquid medium in sewage, the separation cavity can separate the non-liquid medium in the sewage, and the separated liquid medium is stored in the containing cavity; the surface cleaning equipment is provided with a first working state and a second working state, the first working state is that the backflow prevention air duct is positioned at the upper part of the sewage inlet pipe, and the second working state is that the backflow prevention air duct is positioned at the upper part of the box body.

Preferably, in the first working state, a first included angle exists between the box body and the surface to be cleaned, and the first included angle is smaller than 20 degrees; in the second working state, a second included angle is formed between the box body and the surface to be cleaned, and the second included angle is larger than or equal to 20 degrees.

Preferably, the box cover assembly is further provided with an air outlet duct communicated with the negative pressure device, and the separation cavity and the backflow prevention duct are respectively communicated with the negative pressure device through the air outlet duct.

Preferably, the vacuum value of the separation chamber is smaller than the vacuum value of the backflow prevention air duct, and the path length between the starting end of the air flow flowing through the backflow prevention air duct and the negative pressure device is smaller than the path length between the starting end of the air flow flowing through the separation chamber and the negative pressure device.

Preferably, the backflow prevention air duct is arranged in the box body; and/or, the backflow prevention air duct is arranged outside the box body.

Preferably, a liquid blocking structure is arranged in the accommodating cavity, the liquid blocking structure is positioned at one side of the backflow prevention air duct far away from the negative pressure device and is distributed adjacent to an inlet of the backflow prevention air duct, and the flow section of fluid at the liquid blocking structure is larger than the section of the backflow prevention air duct; wherein the liquid blocking structure is configured to prevent splashed liquid from entering the backflow prevention air duct.

Preferably, the cover assembly includes: the box cover is detachably arranged at the opening end of the box body; the filter screen base is detachably connected with the box cover, the box cover and the filter screen base are arranged together to form the separation cavity in a surrounding mode, a sewage channel is arranged at one end portion, far away from the box cover, of the filter screen base, a filter piece is arranged at the sewage channel, and the separation cavity is communicated with the accommodating cavity through the sewage channel;

The box cover is provided with an air outlet air duct and an anti-backflow air duct, the anti-backflow air duct is provided with an inlet on the filter screen base, the filter screen base is further provided with a liquid blocking structure, the liquid blocking structure is distributed adjacent to the inlet, and the projection of the liquid blocking structure on the sewage inlet pipe shaft direction is at least partially overlapped with the projection of the inlet on the sewage inlet pipe shaft direction.

Preferably, the outer circumferential surface of the filter screen base is concavely provided with a groove, the groove is provided with a notch on the end surface of the filter screen base far away from the box cover, the notch is communicated with the inlet through the groove, and the liquid blocking structure is arranged in the groove.

Preferably, the liquid blocking structure comprises a first blocking piece and a second blocking piece, the first blocking piece and the second blocking piece are distributed at intervals in the axial direction of the sewage inlet pipe, an opening is formed in the second blocking piece, and the projection of the first blocking piece in the axial direction of the sewage inlet pipe at least partially falls into the opening; or alternatively

The liquid blocking structure comprises a plurality of partition plates which are distributed at intervals in the axial direction of the sewage inlet pipe, and each partition plate is provided with a plurality of through holes; or alternatively

The liquid blocking structure comprises at least one first blocking plate and at least one second blocking plate, wherein the first blocking plates are distributed in parallel, the second blocking plates are distributed in parallel, and an included angle is formed between the first blocking plate, the second blocking plate and the sewage inlet shaft, the inclination direction of the first blocking plate is opposite to the inclination direction of the second blocking plate, the first blocking plate and the second blocking plate are distributed at intervals, and the projection part of the first blocking plate and the second blocking plate in the sewage inlet shaft direction is overlapped; or alternatively

The liquid blocking structure comprises a plurality of fins which are distributed at intervals in the axial direction and the radial direction of the sewage inlet pipe, wherein the projection of at least one fin in the plurality of fins in the axial direction of the sewage inlet pipe is overlapped with the inlet of the backflow prevention air duct.

Preferably, the tank cover is provided with a water-vapor separation chamber, the sewage outlet is located in the water-vapor separation chamber, the water-vapor separation chamber is a part of the separation chamber, and in the second working state, the water-vapor separation chamber is located at the middle upper part of the separation chamber and is opened towards the sewage outlet.

Preferably, the end face, far away from the box cover, of the filter screen base is provided with a through hole for the dirt inlet pipe to penetrate through, the through hole is provided with a guide pipe positioned in the separation cavity, the guide pipe is sleeved on the periphery of the dirt inlet pipe, and the inner wall of the guide pipe is attached to the outer wall of the dirt inlet pipe.

Preferably, the filter element is accommodated in the separation cavity, the filter element comprises a filter main body part with a plurality of filter holes and a support part arranged on one side of the filter main body part away from the tank cover, and the filter main body part is erected on one side of the sewage channel, which is close to the tank cover, through the support part; the edge of the filtering main body part is attached to the cavity wall of the separation cavity and the outer side wall of the guide pipe.

Preferably, the dirt inlet pipe is located in the accommodating cavity, and in the first working state, the accommodating cavity is provided with a first side wall located above the dirt inlet pipe and a second side wall located below the dirt inlet pipe, wherein the dirt inlet pipe is distributed close to the first side wall.

The technical scheme provided by the utility model has the following advantages:

In the specific embodiment, the liquid medium entering the separation cavity enters the accommodating cavity through the sewage channel under the action of negative pressure and self gravity, and in the process, part of the gas medium continuously enters the accommodating cavity through the sewage channel in the separation cavity, so that the purpose of blocking the liquid medium from reversely flowing into the separation cavity is realized, and the solid-liquid separation effect is good;

In the embodiment, the accommodating cavities are relatively independent, and redundant space is not required to be arranged in the accommodating cavities, so that the volume utilization rate of the accommodating cavities is effectively improved, and the size of the whole machine can be reduced under the same effective volume;

In the specific embodiment, the liquid blocking structure is arranged in the accommodating cavity, and can prevent liquid medium from being sucked into the backflow prevention air duct due to oscillation in the movement process of the surface cleaning equipment, so that the liquid medium is prevented from entering the main fan.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a surface cleaning apparatus according to the present utility model;

FIG. 2 is a schematic view of a surface cleaning apparatus according to the present utility model in a second operating state;

FIG. 3 is a schematic view of a surface cleaning apparatus according to the present utility model in a first operating state;

FIG. 4 is a schematic illustration of the case body and case cover assembly exploded;

FIG. 5 is a schematic cross-sectional view of the lid assembly;

FIG. 6 is a schematic perspective view of the lid assembly;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a schematic view of the structure of a filter base;

FIG. 9 is a schematic view of a filter element;

FIG. 10 is a schematic view of the backflow prevention air duct positioned outside the tank body;

FIG. 11 is a schematic illustration of a liquid barrier structure in another possible implementation;

FIG. 12 is a schematic view of a liquid blocking structure in yet another possible implementation;

fig. 13 is a schematic view of a liquid barrier structure in yet another possible implementation.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. The utility model will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

Referring to fig. 1 to 3, the present utility model provides a surface cleaning apparatus for cleaning a surface to be cleaned, the surface to be cleaned being a floor. The surface cleaning device is provided with a negative pressure device 400, the negative pressure device 400 is used for generating negative pressure, the negative pressure generated by the negative pressure device 400 can enable the surface cleaning device to form suction airflow, dirt on the ground is sucked into the surface cleaning device under the action of the suction airflow, and therefore the purpose of cleaning the ground is achieved. In an application scenario, the surface cleaning apparatus is a floor washer, the negative pressure device 400 is a main motor, and the case where the surface cleaning apparatus is a floor washer will be mainly described below as an example.

Referring to fig. 4 and 5, the surface cleaning apparatus includes a tank body 100 and a tank cover assembly 200. The case body 100 is hollow and has one end opened, and the case cover assembly 200 is hermetically disposed at the opened end of the case body 100. The box body 100 is provided with a dirt inlet pipe 110, and the hollow of the box body 100 is a containing cavity 101. Under the action of suction air flow generated by negative pressure, dirt on the ground can enter the accommodating cavity 101 through the dirt inlet pipe 110, so that the aim of cleaning the ground is fulfilled. Wherein the soil is a mixture of solid, liquid and gas.

Regarding the installation position of the dirt inlet pipe 110, the dirt inlet pipe 110 may be provided in the housing chamber 101 or may be provided outside the tank body 100. When the dirt inlet pipe 110 is located at the outer side of the tank body 100, the dirt inlet pipe 110 is a part of the outer side wall of the tank body 100. In the present embodiment, the dirt inlet pipe 110 is accommodated in the tank body 100, that is, the dirt inlet pipe 110 is located in the accommodating chamber 101. The tank body 100 extends in the axial direction of the dirt inlet pipe 110, and in this specification, the axial direction and the radial direction are the axial direction and the radial direction of the dirt inlet pipe 110 unless otherwise specified.

The surface cleaning apparatus has a first operating state and a second operating state. Referring to fig. 3, the first operating state refers to: the surface cleaning apparatus is required to be in a lying state when in a working state when lying on the ground, for example, when cleaning a sofa bottom, a bed bottom and other low spaces. In the first operating state, a first included angle exists between the tank body 100 and the ground. Wherein, the value range of the first included angle is: less than 20 but not including 20. For example, the value of the first included angle may be: 0 °, 5 °, 10 °, 15 °, 19 °, etc., or increases in value between 0 ° and 19 ° in 1 ° intervals.

In the first working state, the accommodating cavity 101 is provided with a first side wall 102 positioned above the sewage inlet pipe 110 and a second side wall 103 positioned below the sewage inlet pipe 110, wherein the sewage inlet pipe 110 is distributed close to the first side wall 102. It should be noted that the "up and down direction" is the up and down direction in fig. 3. By distributing the dirt inlet pipe 110 close to the first side wall 102, it is ensured that the tank body 100 has a sufficient volume for accommodating the liquid medium in the first operating state.

In the first operating state, the effective volume of the tank body 100 is: the space between the bottom end of the sewage inlet pipe 110 and the second side wall 103, of course, the liquid level of the tank body 100 can only be close to the bottom end of the sewage inlet pipe 110, but cannot be equal to the bottom end of the sewage inlet pipe 110, and when the liquid level is equal to the bottom end of the sewage inlet pipe 110, the liquid medium is extremely easy to flow out reversely through the sewage inlet pipe 110, so that the cleaning effect is affected.

Referring to fig. 2, the second operating state refers to: the surface cleaning apparatus is in a normal operating state. For example, the floor cleaning device is used for cleaning living room floors, aisle floors and other open spaces. In the second operating state, a second included angle exists between the case body 100 and the ground, and the second included angle is larger than the first included angle. The value range of the second included angle is as follows: greater than or equal to 20 °. Preferably, the second included angle is greater than or equal to 20 ° and less than or equal to 90 °. For example, the second angle may have a value of 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, or the like, or may increase in value by 1 °, 2 °, 3 °,4 °, 5 °, 6 °, 7 °, 8 °, 9 ° between 20 ° and 90 °.

In order to separate the non-liquid medium from the liquid medium in the dirt, the tank cover assembly 200 is provided with a separation chamber 201, and the separation chamber 201 is located in the tank body 100 and is in communication with the accommodating chamber 101, wherein the non-liquid medium refers to a solid medium and a gaseous medium. The sewage outlet 111 of the sewage inlet pipe 110 is positioned in the separation cavity 201, and the separation cavity 201 is communicated with the main motor.

The cover assembly 200 is provided with an air outlet duct 202 communicating the separation chamber 201 with the main motor. Under the action of the negative pressure, after the dirt enters the separation chamber 201 through the dirt inlet pipe 110, the separation chamber 201 can separate the non-liquid medium in the dirt. Specifically, the separated solid medium is stored in the separation cavity 201, the gas medium enters the main motor through the air outlet duct 202 under the action of negative pressure, and the separated liquid medium is stored in the accommodating cavity 101, so that the solid-liquid separation of dirt is realized.

The cover assembly 200 includes a cover 210 and a filter base 220, where the cover 210 and the filter base 220 enclose the separation chamber 201, and the air outlet duct 202 is formed on the cover 210. Wherein, the case cover 210 and the filter screen base 220 are both in a shape of a case. The cover 210 is detachably disposed at the opening end of the case body 100, and a sealing ring (not shown) is disposed between the cover and the opening end of the case body 100.

The case cover 210 is provided with a water-vapor separation chamber 207, which is a part of the separation chamber 201, the drain outlet 111 is located in the water-vapor separation chamber 207, and the water-vapor separation chamber 207 is in a state of being covered on the periphery of the drain outlet 111. In the second operating state, the water-vapor separation chamber 207 is located at the middle upper portion of the separation chamber 201 and is opened toward the sewage outlet 111, and a preset interval exists between the water-vapor separation chamber 207 and the bottom of the filter screen base 220 in the up-down direction. During operation, the air flow entering the separation cavity 201 through the sewage outlet 111 flows along the wall of the water-vapor separation chamber 207, and finally enters the main fan through the air outlet air duct 202, so that the flow path of the air flow in the separation cavity 201 is effectively prolonged. In the above process, the liquid medium suspended in the air flow can accumulate on the chamber wall and drip, which is beneficial to separating the liquid medium suspended in the separation chamber 201 from the gas medium, thereby preventing the liquid medium suspended from entering the main motor.

The filter base 220 is located in the accommodating cavity 101 and is detachably connected with the case cover 210. The detachable connection mode between the filter screen base 220 and the box cover 210 can facilitate the user to pour the solid medium in the separation cavity 201, is also convenient for cleaning the separation cavity 201, is convenient to use, and effectively improves the use experience of the user.

Referring to fig. 5 to 8, a through hole 206 for the dirt feeding tube 110 to pass through is provided on an end surface of the filter screen base 220 away from the cover 210, and a conduit 250 is provided at the through hole 206 and located in the separation chamber 201. The conduit 250 is sleeved on the outer periphery of the sewage inlet pipe 110, and the inner wall of the conduit 250 is attached to the outer wall of the sewage inlet pipe 110. One end of the conduit 250 is fixedly disposed on an end surface of the filter screen base 220 away from the case cover 210, and the opposite end of the conduit 250 is a free end. The drain 111 of the sewage inlet pipe 110 is higher than the free end of the guide pipe 250, and the free end of the guide pipe 250 is distributed close to the drain 111. In this embodiment, the duct 250 is disposed around the periphery of the dirt inlet pipe 110, so as to ensure the sealing performance between the dirt inlet pipe 110 and the filter screen base 220 to a certain extent.

The separation chamber 201 is communicated with the accommodating chamber 101 through the sewage channel 240, and liquid medium in sewage sucked into the separation chamber 201 can enter the accommodating chamber 101 through the sewage channel 240. Specifically, the sewage passage 240 is provided at an end of the screen base 220 remote from the tank cover 210. In the second operating state, the sewage channel 240 is located at the bottom of the tank cover assembly 200, so that the liquid medium can enter the accommodating cavity 101 under the action of gravity, and the structure is simple and the filtering effect is good.

The number of the sewage channels 240 may be one, two, or more. Fig. 5 is a schematic diagram of the sewage channel 240 when one sewage channel 240 is provided, and the number of sewage channels 240 may be determined according to actual use conditions.

In order to avoid that the solid medium with smaller particle size in the separation chamber 201 enters the receiving chamber 101 together with the liquid medium. In this embodiment, a filter 230 is provided at the sewage passage 240. The filtering piece 230 can retain the solid medium with smaller particle size in the separation cavity 201, so that the solid medium with smaller particle size is prevented from entering the containing cavity 101 along with the liquid medium, and the effect of solid-liquid separation is good.

Further, the filter 230 is accommodated in the separation chamber 201. Referring to fig. 9, the filter 230 includes a filter body 231 having a plurality of filter holes, and a support 232 disposed on a side of the filter body 231 away from the cover 210. The edge of the filter body 231 is bonded to the wall of the separation chamber 201 and the outer wall of the duct 250. The filter body 231 is installed on a side of the sewage passage 240 near the cover 210 by the support 232. The supporting portion 232 is used for forming a water gap between the filtering main body portion 231 and the inlet of the sewage channel 240, so as to prevent the solid medium stored in the separation chamber 201 from being covered at the inlet of the sewage channel 240, and affecting the effect of solid-liquid separation.

In this embodiment, the cover assembly 200 is further provided with a backflow prevention air duct 203 that communicates the accommodating chamber 101 with the air outlet air duct 202. The backflow prevention air duct 203 is communicated with the main motor through the air outlet air duct 202. In the first operating state, as shown in fig. 3, the backflow prevention air passage 203 is located at the upper portion of the dirt inlet pipe 110; in the second operating state, as shown in fig. 2, the backflow prevention wind tunnel 203 is located at the upper portion of the tank body 100.

Regarding the installation position of the backflow prevention air duct 203, the backflow prevention air duct 203 may be installed inside the box body 100 or may be installed outside the box body 100. Fig. 3 shows a case where the backflow prevention air passage 203 is accommodated in the accommodating chamber 101; fig. 10 is a case where the backflow prevention wind tunnel 203 is located outside the box body 100. When the backflow prevention air duct 203 is located outside the tank body 100, the backflow prevention air duct 203 is a part of the outer sidewall of the surface cleaning apparatus, or the backflow prevention air duct 203 may be formed in the body of the surface cleaning apparatus, for example, the backflow prevention air duct 203 is formed inside a handle (not shown). Preferably, the anti-backflow air duct 203 is located in the accommodating cavity 101 and is formed on the box cover 210, and the anti-backflow air duct 203 is approximately parallel to the dirt inlet pipe 110.

When the main motor works, air in the accommodating cavity 101 and the separating cavity 201 is discharged by the main motor, and the backflow prevention air duct 203 and the accommodating cavity 101 are in a negative pressure state. Wherein, the vacuum value of the separation chamber 201 is smaller than the vacuum value of the backflow prevention air passage 203. The reason is that: to better achieve the gas-liquid separation effect of the separation chamber 201, the air flow path in the separation chamber 201 is longer, so that the path length between the start end of the air flow flowing through the backflow prevention wind channel 203 and the main motor is smaller than the path length between the start end of the air flow flowing through the separation chamber 201 and the main motor. Of course, although the vacuum value of the separation chamber 201 is smaller than that of the backflow prevention air passage 203, the vacuum value of the separation chamber 201 can fully satisfy the suction force requirement required for cleaning the floor.

Referring to fig. 5, the hollow arrow represents the flow direction of the gaseous medium, and the 30 ° arrow represents the flow direction of the liquid medium. The liquid medium entering the separation cavity 201 enters the accommodating cavity 101 through the sewage channel 240 under the action of negative pressure and self gravity, and in the process, part of the gas medium continuously enters the accommodating cavity 101 through the sewage channel 240 in the separation cavity 201, so that the purpose of blocking the liquid medium from reversely flowing into the separation cavity 201 is realized, and the solid-liquid separation effect is good. As can be seen from the above description, in the embodiment, since the accommodating cavity 101 is relatively independent, no redundant space is needed in the accommodating cavity 101, thereby effectively improving the volume utilization rate of the accommodating cavity 101 and reducing the overall size under the same effective volume.

Considering that the surface cleaning apparatus may move during the cleaning process, the liquid medium stored in the accommodating cavity 101 may shake during the moving process, in order to avoid that the liquid medium is sucked into the anti-backflow air duct 203 due to the oscillation during the moving process of the surface cleaning apparatus, the accommodating cavity 101 is provided with the liquid blocking structure 300. The liquid blocking structure 300 is used for blocking liquid medium from entering the backflow prevention air passage 203, so that the liquid medium is prevented from entering the main fan.

The liquid blocking structure 300 is located at one side of the backflow prevention wind channel 203 away from the main motor, and is distributed adjacent to the inlet of the backflow prevention wind channel 203. Further, the flow cross section of the fluid at the liquid blocking structure 300 is larger than the cross section of the backflow prevention air channel 203, and the "fluid" refers to a gaseous medium, so as to ensure low wind speed and reduce the risk of the liquid medium entering the backflow prevention air channel 203.

The specific structure of the liquid blocking structure 300 will be described below by taking the case where the backflow prevention wind tunnel 203 is provided inside the tank body 100 as an example, but the scope of the present utility model is not limited thereto as will be understood from the above description.

The liquid blocking structure 300 is disposed on the filter base 220, and the backflow prevention air passage 203 is formed with an inlet 204 on the filter base 220. Wherein, the projection of the liquid blocking structure 300 on the axial direction of the dirt inlet pipe 110 is at least partially overlapped with the projection of the inlet 204 on the axial direction of the dirt inlet pipe 110, so as to avoid being directly sucked into the backflow prevention wind channel 203 when the liquid medium oscillates.

Specifically, referring to fig. 6 and 7, the outer circumference of the filter base 220 is concavely formed with a groove 205, and the liquid blocking structure 300 is disposed in the groove 205. The recess 205 is formed with a slot in the end of the screen base 220 remote from the lid 210, the slot communicating with the inlet 204 through the recess 205. In the working process, the gas medium in the accommodating cavity 101 enters the groove 205 through the notch, then enters the backflow prevention air duct 203 through the liquid blocking structure 300, and then enters the main motor through the air outlet air duct 202.

In one possible implementation, with continued reference to fig. 6, the liquid blocking structure 300 includes a first baffle 310 and a second baffle 320, where the first baffle 310 and the second baffle 320 are spaced apart in the axial direction of the dirt inlet tube 110. The second baffle 320 is provided with an opening 321, and the projection of the first baffle 310 in the axial direction of the dirt inlet pipe 110 at least partially falls into the opening 321.

In another possible implementation, referring to fig. 11, the liquid blocking structure 300 includes a plurality of separators 330 axially spaced apart from each other in the dirt inlet pipe 110, where each of the separators 330 has a plurality of through holes 331 formed therein.

In another possible implementation, referring to fig. 12, the liquid blocking structure 300 includes at least one first blocking plate 340 and at least one second blocking plate 350, the first blocking plates 340 are parallel to each other, the second blocking plates 350 are parallel to each other, and the first blocking plates 340, the second blocking plates 350 and the dirt inlet tube 110 are disposed at an included angle therebetween. The inclination direction of the first blocking plate 340 is opposite to the inclination direction of the second blocking plate 350, the first blocking plate 340 and the second blocking plate 350 are spaced apart, and the projection of the first blocking plate 340 and the second blocking plate 350 on the axial direction of the dirt inlet pipe 110 is overlapped.

In yet another possible implementation, referring to fig. 13, the liquid blocking structure 300 includes a plurality of fins 360, where the plurality of fins 360 are spaced apart in an axial direction and a radial direction of the dirt inlet tube 110. Wherein a projection of at least one fin of the plurality of fins 360 on the axial direction of the dirt inlet tube 110 overlaps with an inlet of the backflow prevention wind tunnel 203.

Of course, the liquid blocking structure 300 includes, but is not limited to, the above structure, which can be used for blocking the liquid medium while satisfying the gas medium circulation, and will not be described herein.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. Based on the embodiments of the present utility model, those skilled in the art may make other different changes or modifications without making any creative effort, which shall fall within the protection scope of the present utility model.

Claims

1. A surface cleaning apparatus for cleaning a surface to be cleaned, the surface cleaning apparatus being provided with a negative pressure device for generating a negative pressure, comprising:

the box body is hollow in the interior and is provided with an opening at one end to form a containing cavity, and the box body is provided with a sewage inlet pipe;

The box cover assembly is arranged at the opening end of the box body, and is provided with a separation cavity which is positioned in the box body and communicated with the accommodating cavity;

The sewage outlet of the sewage inlet pipe is positioned in the separation cavity, the separation cavity is communicated with the negative pressure device, the separation cavity is configured to separate non-liquid medium and liquid medium in sewage, the separation cavity can separate the non-liquid medium in the sewage, and the separated liquid medium is stored in the containing cavity;

The surface cleaning equipment is provided with a first working state and a second working state, the first working state is that the backflow prevention air duct is positioned at the upper part of the sewage inlet pipe, and the second working state is that the backflow prevention air duct is positioned at the upper part of the box body.

2. The surface cleaning apparatus of claim 1, wherein in the first operational state, a first included angle exists between the tank body and the surface to be cleaned, the first included angle being less than 20 °;

In the second working state, a second included angle is formed between the box body and the surface to be cleaned, and the second included angle is larger than or equal to 20 degrees.

3. A surface cleaning apparatus as claimed in claim 1, wherein,

The box cover assembly is further provided with an air outlet duct communicated with the negative pressure device, and the separation cavity and the backflow prevention duct are respectively communicated with the negative pressure device through the air outlet duct.

4. A surface cleaning apparatus as claimed in claim 1, wherein,

The vacuum value of the separation cavity is smaller than that of the backflow prevention air duct, and the path length between the starting end of the air flow flowing through the backflow prevention air duct and the negative pressure device is smaller than that between the starting end of the air flow flowing through the separation cavity and the negative pressure device.

5. A surface cleaning apparatus as claimed in claim 1, wherein,

The backflow prevention air duct is arranged in the box body; and/or the number of the groups of groups,

The backflow prevention air duct is arranged outside the box body.

6. A surface cleaning apparatus as claimed in claim 1, wherein,

The accommodating cavity is internally provided with a liquid blocking structure, the liquid blocking structure is positioned at one side of the backflow prevention air duct far away from the negative pressure device and is distributed adjacent to the inlet of the backflow prevention air duct, and the flow section of fluid at the liquid blocking structure is larger than the section of the backflow prevention air duct;

Wherein the liquid blocking structure is configured to prevent splashed liquid from entering the backflow prevention air duct.

7. The surface cleaning apparatus of claim 3, wherein the cover assembly comprises:

the box cover is detachably arranged at the opening end of the box body;

The filter screen base is detachably connected with the box cover, the box cover and the filter screen base are arranged together to form the separation cavity in a surrounding mode, a sewage channel is arranged at one end portion, far away from the box cover, of the filter screen base, a filter piece is arranged at the sewage channel, and the separation cavity is communicated with the accommodating cavity through the sewage channel;

8. The surface cleaning apparatus of claim 7,

The outer circumferential surface of the filter screen base is concavely provided with a groove, the groove is formed on the end face, far away from the box cover, of the filter screen base, the groove is communicated with the inlet through the groove, and the liquid blocking structure is arranged in the groove.

9. A surface cleaning apparatus as claimed in any one of claims 6 to 8,

The liquid blocking structure comprises a first blocking piece and a second blocking piece, the first blocking piece and the second blocking piece are distributed at intervals in the axial direction of the sewage inlet pipe, an opening is formed in the second blocking piece, and the projection of the first blocking piece in the axial direction of the sewage inlet pipe at least partially falls into the opening; or alternatively

10. The surface cleaning apparatus of claim 7,

The case lid is equipped with the steam-water separation room, the drain is located in the steam-water separation room, the steam-water separation room is a part of separation chamber, wherein, under the second operating condition, the steam-water separation room is located the well upper portion of separation chamber and opening orientation drain.

11. The surface cleaning apparatus of claim 7,

The filter screen base is far away from be equipped with the confession on the terminal surface of case lid advance dirty pipe and wear to establish the through-hole, the through-hole department is equipped with and is located the pipe of separation intracavity, the pipe cover is located advance dirty periphery of pipe, just the inner wall of pipe with advance the laminating of dirty outer wall of pipe.

12. The surface cleaning apparatus of claim 11,

The filter element is accommodated in the separation cavity and comprises a filter main body part with a plurality of filter holes and a supporting part arranged on one side of the filter main body part away from the tank cover, and the filter main body part is erected on one side of the sewage channel, which is close to the tank cover, through the supporting part;

the edge of the filtering main body part is attached to the cavity wall of the separation cavity and the outer side wall of the guide pipe.

13. A surface cleaning apparatus as claimed in claim 1, wherein,

The sewage inlet pipe is positioned in the accommodating cavity, and in the first working state, the accommodating cavity is provided with a first side wall positioned above the sewage inlet pipe and a second side wall positioned below the sewage inlet pipe, wherein the sewage inlet pipe is distributed close to the first side wall.