Window cleaning machine

Abstract

The utility model discloses a window cleaning machine, which belongs to the technical field of cleaning equipment and is characterized in that an upper shell and a lower shell define an internal space of a main machine; a fence is arranged in the lower shell, a space surrounded by the middle shell and the fence forms a negative pressure air duct, a first step is arranged at the top of the fence, and a second step matched with the first step is arranged at the bottom of the middle shell; the cleaning disc comprises an inner disc and an outer disc. The top face of the inner disc is provided with an air blocking groove in the periphery of the negative pressure hole. At least two layers of hold-down rings are arranged on the periphery of the bottom surface of the outer disc; the cleaning discs are correspondingly installed on the two driving devices respectively, and the negative pressure holes communicate with the negative pressure air openings. The lower shell is provided with a third choke ring on the periphery of the negative pressure air port, and the third choke ring is inserted into the choke groove. The window cleaning machine has the advantage of being good in air tightness, the load of the negative pressure fan can be effectively reduced, and the cruising ability of the window cleaning machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cleaning equipment technical field especially relates to a window cleaning machine. BACKGROUND

[0002] The window cleaning machine can be adsorbed on the surface of the glass stably, and the current window cleaning machine has poor air tightness, so that the load of the negative pressure fan of the window cleaning machine is large, thereby greatly reducing the endurance of the window cleaning machine. SUMMARY

[0003] The utility model discloses a window cleaning machine to solve the above -mentioned problems.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] A window cleaning machine, comprising a host computer and a cleaning disc.

[0006] The host computer comprises a shell, a negative pressure fan and a driving device, the shell comprises an upper shell, a middle shell and a lower shell, the upper shell is installed on the lower shell, and the upper shell and the lower shell form an internal space of the host computer; the inside of the lower shell is provided with a fence, the middle shell is installed above the fence, the space surrounded by the middle shell and the fence forms a negative pressure air duct, the top of the fence is provided with a first step, and the bottom of the middle shell is provided with a second step matched with the first step; the lower shell is provided with a negative pressure air port at both ends of the negative pressure air duct; the middle shell is provided with a fan cavity, and an air inlet hole communicated with the negative pressure channel is arranged at the bottom of the fan cavity, and the negative pressure fan is installed in the fan cavity; the driving device is two, and the driving device is installed at the negative pressure air port respectively;

[0007] The cleaning disc comprises an inner disc and an outer disc, the middle part of the inner disc is provided with a negative pressure hole penetrating upward and downward, and the top surface of the inner disc is provided with a wind resistance groove at the outer periphery of the negative pressure hole; the outer disc is a ring structure, the outer disc is arranged at the outer periphery of the inner disc, and the bottom surface of the outer disc is provided with at least two layers of compression rings;

[0008] The cleaning disc is two, and is installed on the two driving devices respectively, and the negative pressure hole is communicated with the negative pressure air port; the lower shell is provided with a third wind resistance ring at the outer periphery of the negative pressure air port, and the third wind resistance ring is inserted into the wind resistance groove.

[0009] Preferably, the top surface of the lower shell is provided with a partition strip between the two negative pressure air inlets, the partition strip separates the negative pressure air duct into symmetrical first and second air ducts, and the partition strip is attached to the bottom surface of the middle shell and separates the air inlet into symmetrical first and second air inlets.

[0010] Preferably, the middle part of the partition strip extends into the air inlet.

[0011] Preferably, the upper shell is provided with a plurality of air outlets.

[0012] Preferably, the inner disc comprises an outer ring portion, an inner ring portion and a connecting rib, the outer ring portion is annular in structure and is arranged outside the inner ring portion, and the negative pressure hole is formed between the outer ring portion and the inner ring portion; the connecting rib is arranged on the inner ring portion and extends outward in a radial manner, and the outer ring portion is fixedly connected with the inner ring portion through the connecting rib.

[0013] Preferably, the top surface of the outer ring portion is provided with a first air resistance ring and a second air resistance ring, the first air resistance ring is arranged around the outer side edge of the negative pressure hole, the second air resistance ring is arranged outside the first air resistance ring, and the air resistance groove is formed between the outer wall of the first air resistance ring and the inner wall of the second air resistance ring.

[0014] Preferably, the inner side wall of the outer disc is provided with a convex ring, the upper surface of the convex ring is provided with a first air resistance ring; the bottom edge of the outer ring portion is provided with a second air resistance ring protruding downward, and the second air resistance ring is inserted between the outer side wall of the first air resistance ring and the inner side wall of the outer disc.

[0015] Preferably, the outer disc is provided with a plurality of buckles, the two sides of the buckle are respectively provided with limiting grooves; the outer wall of the inner disc is provided with a buckle slot corresponding to the buckle, and the two sides of the buckle slot are respectively provided with a limiting protrusion corresponding to the limiting groove.

[0016] One embodiment of the utility model has the following beneficial effects:

[0017] 1. The cooperation of the middle shell and the fence forms a negative pressure channel, and the cooperation of the first step and the second step between the middle shell and the fence can increase the contact area between the middle shell and the fence, thereby increasing the air tightness of the negative pressure channel and improving the air leakage problem between the middle shell and the fence.

[0018] 2. The air resistance groove is arranged on the top surface of the inner disc, and the bottom surface of the lower shell is provided with a third air resistance ring corresponding to the air resistance groove around the outer periphery of the negative pressure air inlet, the third air resistance ring is inserted into the air resistance groove, and the air path is bent at multiple positions, thereby increasing the resistance of external air entering the cleaning disc and improving the air tightness of the cleaning disc.

[0019] 3. The bottom surface of the outer disc is provided with at least two layers of compression rings, through the at least two layers of compression rings, the cleaning edge can be compressed on the glass surface in a larger area, so that the air tightness of the cleaning disc is improved, and the cleaning effect is also improved;

[0020] 4. Through the increase of the air tightness of the window cleaning machine, the working load of the negative pressure fan can be effectively reduced, under the premise of achieving the same adsorption force, the working power of the negative pressure fan is smaller, so that the endurance of the window cleaning machine can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings further illustrate the present application, but the contents in the drawings do not constitute any limitation to the present application.

[0022] Figure 1 is a perspective structural schematic view of a window cleaning machine of one embodiment of the present application;

[0023] Figure 2 is a cross-sectional structural schematic view of the window cleaning machine of one embodiment of the present application;

[0024] Figure 3 is a perspective structural schematic view of a cleaning disc of one embodiment of the present application;

[0025] Figure 4 is a structural schematic view of the window cleaning machine of one embodiment of the present application with one cleaning disc removed;

[0026] Figure 5 is an exploded structural schematic view of the window cleaning machine of one embodiment of the present application;

[0027] Figure 6 is a cross-sectional structural schematic view of the window cleaning machine of one embodiment of the present application;

[0028] Figure 7 is an exploded structural schematic view of the cleaning disc of one embodiment of the present application;

[0029] Figure 8 is a perspective structural schematic view of the cleaning disc of one embodiment of the present application;

[0030] In the drawings: 1 - host, 11 - shell, 111 - upper shell, 1111 - air outlet, 112 - middle shell, 1121 - second step, 1122 - fan cavity, 1123 - air inlet, 113 - lower shell, 1131 - enclosure, 1132 - first step, 1133 - negative pressure air outlet, 1134 - third air resistance ring, 1135 - partition strip, 114 - negative pressure air duct, 12 - negative pressure fan, 13 - driving device, 2 - cleaning disc, 21 - inner disc, 211 - outer ring part, 2111 - first air resistance ring, 2112 - second air resistance ring, 2113 - second air resistance ring, 212 - inner ring part, 213 - connecting rib, 214 - negative pressure hole, 215 - air resistance groove, 216 - clamping groove, 217 - limiting protrusion, 22 - outer disc, 221 - compression ring, 222 - convex ring, 223 - first air resistance ring, 224 - buckle, 225 - limiting groove. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and are not intended to limit the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] One type of window cleaning machine in this embodiment, such as Figures 1-8 As shown, it includes a host unit 1 and a cleaning disk 2;

[0037] like Figure 2 and Figure 5As shown, the host 1 comprises a shell 11, a negative pressure fan 12 and a driving device 13, the shell 11 comprises an upper shell 111, a middle shell 112 and a lower shell 113, the upper shell 111 is installed on the lower shell 113, and an internal space of the host 1 is formed between the upper shell 111 and the lower shell 113; an inner part of the lower shell 113 is provided with an enclosure 1131, the middle shell 112 is installed above the enclosure 1131, the middle shell 112 and the space enclosed by the enclosure 1131 form a negative pressure air duct 114, a top part of the enclosure 1131 is provided with a first step 1132, and a bottom part of the middle shell 112 is provided with a second step 1121 matched with the first step 1132; the lower shell 113 is respectively provided with a negative pressure air port 1133 at both ends of the negative pressure air duct 114; the middle shell 112 is provided with a fan cavity 1122, and an air inlet hole 1123 in communication with the negative pressure air duct is arranged at a bottom part of the fan cavity 1122, and the negative pressure fan 12 is installed in the fan cavity 1122; the driving device 13 is two, and the driving device 13 is respectively installed at the negative pressure air port 1133;

[0038] As shown in Figure 3 , Figure 7 and Figure 8 , the cleaning disc 2 comprises an inner disc 21 and an outer disc 22, a middle part of the inner disc 21 is provided with a negative pressure hole 214 penetrating up and down, and a top surface of the inner disc 21 is provided with a wind resistance groove 215 at an outer periphery of the negative pressure hole 214; the outer disc 22 is a ring structure, the outer disc 22 is arranged at an outer periphery of the inner disc 21, and an outer periphery of a bottom surface of the outer disc 22 is provided with at least two layers of pressing rings 221.

[0039] The cleaning disc 2 is two, and is respectively installed at two driving devices 13, and the negative pressure hole 214 is in communication with the negative pressure air port 1133; as shown in Figure 6 , the lower shell 113 is provided with a third wind resistance ring 1134 at an outer periphery of the negative pressure air port 1133, and the third wind resistance ring 1134 is inserted into the wind resistance groove 215.

[0040] In working, the negative pressure fan 12 continuously draws away the air between the cleaning disc 2 and the glass surface through the negative pressure air duct 114 to form a negative pressure at the cleaning disc 2, so that the window cleaning machine can be firmly adsorbed on the surface of the glass, and then the two driving devices 13 are alternately started to move the window cleaning machine on the glass, in the moving process, the cleaning disc 2 completes the wiping of the glass, the driving device 13 is the existing structure which is composed of a motor and a speed reduction mechanism, and the specific structure is not in the protection scope of the utility model; since the window cleaning machine is adsorbed on the surface of the glass by generating a negative pressure at the cleaning disc 2, therefore, the air tightness of the window cleaning machine has a great influence on the adsorption force of the window cleaning machine, when the air tightness of the window cleaning machine is poor, then a greater negative pressure is needed to make the window cleaning machine adsorbed on the surface of the glass, in order to improve the air tightness of the window cleaning machine, the utility model mainly realizes through the following parts:

[0041] Firstly, the negative pressure channel is formed through the cooperation of the middle shell 112 and the enclosure 1131, and the contact area between the middle shell 112 and the enclosure 1131 can be increased through the cooperation of the first step 1132 and the second step 1121 between the middle shell 112 and the enclosure 1131, so that the air tightness of the negative pressure channel is increased, and the air leakage problem between the middle shell 112 and the enclosure 1131 is improved;

[0042] Secondly, the utility model sets the wind resistance groove 215 on the top surface of the inner disc 21, and the bottom surface of the lower shell 113 is provided with the third wind resistance ring 1134 matched with the wind resistance groove 215 at the outer periphery of the negative pressure air port 1133, the third wind resistance ring 1134 is inserted into the wind resistance groove 215, so that multiple bending air passages are formed at this position, the resistance of external air entering the inner cleaning disc 2 is increased, and the air tightness of the cleaning disc 2 is improved; it should be pointed out that the window cleaning machine is driven to rotate alternately by the two cleaning discs 2, so as to walk on the glass, in the walking process, the cleaning disc 2 drives the cleaning unit (such as cleaning cloth) installed thereon to wipe the glass, so as to clean the window glass, therefore, the relative rotation between the cleaning disc 2 and the main machine 1 needs to occur, therefore, the wind resistance groove 215 and the third wind resistance ring 1134 on the bottom surface of the main machine 1 are matched, the rotation requirement of the cleaning disc 2 relative to the main machine 1 is met, and the resistance of air flowing into the inner cleaning disc 2 from this position is increased, so that the air tightness of the cleaning disc 2 is improved;

[0043] In addition, at least two layers of compression rings 221 are arranged on the bottom surface of the outer disc 22. The at least two layers of compression rings 221 can make the cleaning edge be compressed on a larger area of the glass surface, thereby improving the air tightness of the cleaning disc 2 and improving the cleaning effect. During the operation of the window cleaning machine, the cleaning disc 2 compresses the cleaning unit to the surface of the glass through the compression rings 221. An internal space surrounded by the compression rings 221 forms a negative pressure space, so that the cleaning unit is stably adsorbed on the surface of the glass and tightly adheres to the surface of the glass. When the cleaning disc 2 moves, the path of the cleaning unit on the surface of the glass is wiped clean, thereby achieving the cleaning effect.

[0044] By increasing the air tightness of the window cleaning machine, the working load of the negative pressure fan 12 can be effectively reduced. Under the premise of achieving the same adsorption force, the working power of the negative pressure fan 12 is smaller, thereby effectively improving the endurance of the window cleaning machine.

[0045] Further, as shown in Figure 2 and Figure 5 , the top surface of the lower shell 113 is provided with a partition strip 1135, the partition strip 1135 is located between the two negative pressure air outlets 1133, and the partition strip 1135 divides the negative pressure air duct 114 into symmetrical first and second air ducts. The partition strip 1135 is attached to the bottom surface of the middle shell 112 and separates the air inlet hole 1123 into symmetrical first and second air inlet holes 1123.

[0046] A partition strip 1135 is arranged between the middle shell 112 and the lower shell 113, and the negative pressure air duct 114 is divided into symmetrical first air duct and second air duct by the partition strip 1135, it is need to point out that the first air duct and the second air duct can be axisymmetric or central symmetric, here is not limited specifically, by dividing the negative pressure air duct 114 into symmetrical first air duct and second air duct, the volume and air flow resistance of the first air duct and the second air duct can be almost the same; in addition, the partition strip 1135 also divides the air inlet hole 1123 into two symmetrical parts, when the negative pressure fan 12 forms negative pressure in the fan cavity 1122, the negative pressure fan 12 draws the air in the negative pressure air duct 114 through the air inlet hole 1123, the air inlet hole 1123 is divided into symmetrical first air inlet hole 1123 and second air inlet hole 1123 by the partition strip 1135, it can be understood that the first air inlet hole 1123 and the second air inlet hole 1123 are communicated with the first air duct and the second air duct respectively, the negative pressure fan 12 draws the air of the first air duct through the first air inlet hole 1123 and draws the air of the second air duct through the second air inlet hole 1123, because the air inlet hole 1123 is divided into two symmetrical first air inlet hole 1123 and second air inlet hole 1123, therefore the negative pressure pressure in the fan cavity 1122 can be more evenly distributed to the first air duct and the second air duct, so that the negative pressure formed by the first air duct and the second air duct is more close, and then the suction force of the two cleaning discs 2 can tend to be equal, when cleaning the glass, the cleaning force of the two cleaning discs 2 on the glass is the same, so that the cleaning effect is more uniform.

[0047] Further, the middle part of the partition strip 1135 extends into the air inlet hole 1123.

[0048] When the negative pressure fan 12 works, the external air enters the first air duct and the second air duct from the two negative pressure air outlets 1133 respectively, and flows into the fan cavity 1122 in opposite directions, when the two air flows collide, a large pressure loss will be generated, therefore by extending the partition strip 1135 into the air inlet hole 1123, the direct collision of the two air flows can be avoided, and a certain flow guiding effect can be achieved, so that the air entering from the two negative pressure air outlets 1133 can flow upward along the partition plate and be drawn away by the negative pressure fan 12, thereby reducing the pressure loss and the load of the negative pressure fan 12.

[0049] Further, the upper shell 111 is provided with a plurality of air outlets 1111.

[0050] The air in the negative pressure channel is drawn into the space between the middle shell 112 and the upper shell 111 by the negative pressure fan 12, so the air in the space needs to be discharged to the outside to enable the negative pressure fan 12 to continuously draw the air in the negative pressure channel to form a negative pressure, and the air drawn by the negative pressure fan 12 can be quickly discharged to the outside of the window cleaning machine by arranging a plurality of air outlets 1111 on the upper shell 111 to enable the space between the middle shell 112 and the upper shell 111 to communicate with the outside space of the window cleaning machine.

[0051] Further, as shown in Figure 3 、 Figure 7 and Figure 8 , the inner disc 21 comprises an outer ring portion 211, an inner ring portion 212 and a connecting rib 213, the outer ring portion 211 is annular in structure and is arranged around the outer side of the inner ring portion 212, and the negative pressure hole 214 is formed between the outer ring portion 211 and the inner ring portion 212; the connecting rib 213 is arranged on the inner ring portion 212 and extends outward in a radial manner, and the outer ring portion 211 is fixedly connected with the inner ring portion 212 through the connecting rib 213.

[0052] By forming the negative pressure hole 214 between the inner ring portion 212 and the outer ring portion 211, the pressure at each position in the cleaning disc 2 can be more uniform, so that the cleaning disc 2 can be stably adsorbed on the surface of the glass; the inner ring portion 212 and the outer ring portion 211 can be firmly connected through the plurality of connecting ribs 213, and the structure is more stable and is not prone to deformation.

[0053] Further, the top surface of the outer ring portion 211 is provided with a first wind blocking ring 2111 and a second wind blocking ring 2112, the first wind blocking ring 2111 is arranged around the outer side edge of the negative pressure hole 214, and the second wind blocking ring 2112 is arranged around the outer side of the first wind blocking ring 2111, and the wind blocking groove 215 is formed between the outer wall of the first wind blocking ring 2111 and the inner wall of the second wind blocking ring 2112.

[0054] The first wind blocking ring 2111 and the second wind blocking ring 2112 protrude from the top surface of the outer ring portion 211 to form the wind blocking groove 215, so that the overall thickness of the outer ring portion 211 does not need to be increased, which helps to make the cleaning disc 2 more lightweight.

[0055] Further, the inner side wall of the outer disc 22 is provided with a convex ring 222, the upper surface of the convex ring 222 is provided with a first wind blocking ring 223; the bottom edge of the outer ring portion 211 is provided with a downwardly protruding second wind blocking ring 2113, and the second wind blocking ring 2113 is inserted between the outer side wall of the first wind blocking ring 223 and the inner side wall of the outer disc 22.

[0056] Through the arrangement, the resistance of the air entering from the gap between the inner disc 21 and the outer disc 22 can be increased, and when the external air enters from the gap between the outer disc 22 and the inner disc 21, the air needs to bypass the second wind blocking ring 2113 downward and then bypass the first wind blocking ring 223 upward, the air is reversed for multiple times, the resistance of the air entering from the gap between the outer disc 22 and the inner disc 21 into the cleaning disc 2 can be greatly increased, and the air tightness of the cleaning disc 2 is improved.

[0057] As shown in Figure 7 The outer disc 22 is provided with a plurality of buckles 224, and the two sides of the buckle 224 are respectively provided with limiting grooves 225; the outer wall of the inner disc 21 is provided with a buckle groove 216 corresponding to the buckle 224, and the two sides of the buckle groove 216 are respectively provided with limiting protrusions 217 corresponding to the limiting grooves 225.

[0058] Through the cooperation of the buckle 224 and the buckle groove 216, the outer disc 22 can be firmly installed on the outer side of the inner disc 21, the limiting grooves 225 and the limiting protrusions 217 are matched, the outer disc 22 and the inner disc 21 can limit the rotation of the outer disc 22 relative to the inner disc 21, and the slipping between the inner disc 21 and the outer disc 22 is avoided.

[0059] In the description of the present specification, the description of the terms "one embodiment", "certain embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The technical principle of the present application is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanation here, the skilled in the art can think of other specific embodiments of the present application without creative labor, and these equivalent variants or replacements are included in the scope defined by the claims of the present application.

Claims

1. A window cleaning machine, characterized in that, The main machine and the cleaning disc are included; The main machine includes a shell, a negative pressure fan and a driving device, the shell includes an upper shell, a middle shell and a lower shell, the upper shell is installed on the lower shell, and an internal space of the main machine is formed between the upper shell and the lower shell; an inner part of the lower shell is provided with an enclosure, the middle shell is installed above the enclosure, a space surrounded by the middle shell and the enclosure forms a negative pressure air duct, a top part of the enclosure is provided with a first step, and a bottom part of the middle shell is provided with a second step matched with the first step; the lower shell is respectively provided with a negative pressure air outlet at both ends of the negative pressure air duct; the middle shell is provided with a fan cavity, an air inlet hole communicated with the negative pressure air duct is arranged at a bottom part of the fan cavity, and the negative pressure fan is installed in the fan cavity; the driving device is two, and the driving device is respectively installed at the negative pressure air outlet; The cleaning disc includes an inner disc and an outer disc, a middle part of the inner disc is provided with a negative pressure hole penetrating up and down, and a top surface of the inner disc is provided with a wind resistance groove at an outer periphery of the negative pressure hole; the outer disc is in a ring structure, the outer disc is arranged at an outer periphery of the inner disc, and an outer periphery of a bottom surface of the outer disc is provided with at least two layers of compression rings; The cleaning disc is two, and is respectively installed at the two driving devices, the negative pressure hole is communicated with the negative pressure air outlet; the lower shell is provided with a third wind resistance ring at an outer periphery of the negative pressure air outlet, and the third wind resistance ring is inserted into the wind resistance groove.

2. A window cleaning machine according to claim 1, wherein A partition strip is arranged on a top surface of the lower shell, the partition strip is located between the two negative pressure air outlets, the partition strip divides the negative pressure air duct into symmetrical first and second air ducts, the partition strip is attached to a bottom surface of the middle shell, and the air inlet hole is divided into symmetrical first and second air inlet holes.

3. A window cleaning machine according to claim 2, wherein, A middle part of the partition strip extends into the air inlet hole.

4. A window cleaning machine according to claim 1, wherein The upper shell is provided with a plurality of air outlets.

5. A window cleaning machine according to any one of claims 1 to 4, wherein The inner disc includes an outer ring part, an inner ring part and a connecting rib, the outer ring part is in a ring structure, is arranged outside the inner ring part, and forms the negative pressure hole between the outer ring part and the inner ring part; the connecting rib is arranged on the inner ring part and extends outward in a radial manner, and the outer ring part is fixedly connected with the inner ring part through the connecting rib.

6. A window cleaning machine according to claim 5, wherein, A top surface of the outer ring part is provided with a first wind resistance ring and a second wind resistance ring, the first wind resistance ring is arranged outside an outer edge of the negative pressure hole, the second wind resistance ring is arranged outside the first wind resistance ring, and the first wind resistance ring and the second wind resistance ring form the wind resistance groove between an outer wall of the first wind resistance ring and an inner wall of the second wind resistance ring.

7. A window cleaning machine according to claim 5, wherein An inner side wall of the outer disc is provided with a convex ring, an upper surface of the convex ring is provided with a first wind resistance ring; a bottom edge of the outer ring part is provided with a second wind resistance ring protruding downward, and the second wind resistance ring is inserted between an outer side wall of the first wind resistance ring and the inner side wall of the outer disc.

8. A window cleaning machine according to any one of claims 1 to 4, wherein The outer disc is provided with a plurality of buckles, both sides of the buckle are respectively provided with limiting grooves; an outer wall of the inner disc is provided with buckle grooves corresponding to the buckles one by one, and both sides of the buckle groove are respectively provided with limiting protrusions corresponding to the limiting grooves one by one.

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