Liquid drainage backflow prevention device and cleaning equipment for solar cell

Abstract

The utility model relates to the technical field of battery processing equipment, in particular to a liquid drainage backflow prevention device and cleaning equipment for a solar battery, and aims to solve the problem that existing solar battery cleaning equipment is not provided with a liquid backflow prevention device or the installed backflow prevention device cannot meet the requirements of a production line. The liquid drainage backflow prevention device comprises a liquid drainage pipe and a backflow prevention assembly. The liquid drainage pipe is provided with a liquid inlet, a liquid drainage opening and a liquid drainage cavity. The backflow preventing assembly is arranged in the liquid discharging cavity and is configured to be capable of opening the liquid discharging cavity under the forward action of liquid flowing in from the liquid inlet and closing the liquid discharging cavity under the reverse action of liquid flowing back from the liquid outlet. When liquid is discharged, the liquid discharging cavity can be opened under the forward action of liquid flowing in from the liquid inlet, so that waste liquid is discharged through the liquid discharging opening, the influence on the liquid discharging flow is avoided, and when backflow occurs, the liquid discharging cavity can be closed under the reverse action of liquid flowing back from the liquid discharging opening, so that the discharged liquid can be effectively prevented from flowing back.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery processing equipment, and particularly provides a liquid discharge backflow prevention device and a cleaning equipment for solar cells. BACKGROUND

[0002] At present, the liquid discharge pipeline of the trough of the photovoltaic heterojunction cell (HJT) cleaning machine does not install a device for preventing liquid backflow. When a single trough needs to be discharged due to abnormal conditions, there is a high probability that the waste discharge pipeline flow will cause the liquid to flow back into other troughs. This will contaminate the liquid in other troughs without abnormal conditions, resulting in defective products in the subsequent production process of silicon wafers. Moreover, since there is no monitoring device, such abnormalities are difficult to monitor.

[0003] In the prior art, although the waste discharge pipeline also has a backflow prevention device to solve the problem of liquid backflow, the existing liquid discharge backflow prevention device cannot be adapted to the cleaning equipment for solar cells. For example, some backflow prevention devices in the prior art need to use elastic members to achieve backflow prevention. However, the structure of the elastic member is relatively complex, and impurities are easily accumulated, resulting in the phenomenon of pipe blockage. In addition, since metal substances cannot exist in the trough, the material requirements for the liquid discharge backflow prevention device are also relatively high.

[0004] In addition, some backflow prevention devices need to use a floating ball to achieve backflow prevention. However, due to the presence of the floating ball, the liquid discharge flow will be greatly reduced. Moreover, after a long period of use, crystallization will accumulate, resulting in the phenomenon of pipe blockage.

[0005] Therefore, the present application urgently needs a liquid discharge backflow prevention device that can prevent waste liquid backflow, reduce the production of defective wafers during the cleaning process, prevent liquid contamination, and reduce chemical energy consumption. CONTENT OF THE UTILITY MODEL

[0006] The present application aims to at least partially solve the above technical problems, i.e., at least partially solve the problem that the existing liquid discharge pipeline of the trough of the photovoltaic heterojunction cell cleaning machine does not install a liquid backflow prevention device or the installed backflow prevention device cannot meet the requirements of the production line.

[0007] In a first aspect, the present application provides a liquid discharge backflow prevention device, which comprises: a liquid discharge pipe having a liquid inlet, a liquid discharge outlet, and a liquid discharge cavity between the liquid inlet and the liquid discharge outlet; and a backflow prevention assembly arranged in the liquid discharge cavity, the backflow prevention assembly being configured to open the liquid discharge cavity under the positive action of liquid flowing from the liquid inlet and to close the liquid discharge cavity under the reverse action of liquid flowing back from the liquid discharge outlet.

[0008] In the preferred technical scheme of the liquid drainage backflow prevention device, the backflow prevention assembly comprises a plurality of blades, the plurality of blades are sequentially arranged along the circumference of the liquid inlet in the liquid drainage cavity, the fixed end of each blade is pivotally connected to the top of the liquid drainage cavity, and the movable end of each blade extends into the liquid drainage cavity; when the blades are inwardly folded, the blades close the liquid drainage cavity.

[0009] In the preferred technical scheme of the liquid drainage backflow prevention device, the backflow prevention assembly further comprises a support member, the support member abuts against the blades to incline the movable end of each blade inwardly.

[0010] In the preferred technical scheme of the liquid drainage backflow prevention device, the support member comprises a plurality of support blocks, each support block is arranged corresponding to one blade; or the support member is a support ring, and the blades are located in the support ring when installed.

[0011] In the preferred technical scheme of the liquid drainage backflow prevention device, the liquid drainage backflow prevention device further comprises a detection member, the detection member is used to detect whether the blades are inwardly folded to close the liquid drainage cavity.

[0012] In the preferred technical scheme of the liquid drainage backflow prevention device, the detection member comprises at least one of a pressure sensor, a photoelectric sensor, a position sensor or a camera.

[0013] In the preferred technical scheme of the liquid drainage backflow prevention device, the detection member is arranged in the liquid drainage cavity; and / or the detection member is arranged on the support member.

[0014] In the preferred technical scheme of the liquid drainage backflow prevention device, the backflow prevention assembly further comprises a sealing member, the sealing member is arranged to seal the gap between two adjacent blades when the blades are inwardly folded and the liquid drainage cavity is closed.

[0015] In a second aspect, the application further provides a cleaning device for a solar cell, the cleaning device comprising a tank, a waste liquid pipe and any one of the above-described liquid drainage backflow prevention devices, wherein the liquid inlet is in communication with the tank, and the liquid outlet is in communication with the waste liquid pipe.

[0016] In the preferred technical scheme of the cleaning device for a solar cell, the cleaning device further comprises an alarm device, the alarm device is in communication connection with the detection member of the liquid drainage backflow prevention device.

[0017] In the case of the above preferred technical solution, by setting the anti-backflow component, on the one hand, during liquid discharge, the liquid flowing in from the liquid inlet can open the liquid discharge cavity, so that the waste liquid is discharged smoothly through the liquid discharge port, avoiding affecting the liquid discharge flow, and further avoiding the phenomenon of pipe blockage; on the other hand, when backflow occurs, the liquid flowing back from the liquid discharge port can close the liquid discharge cavity, so that the liquid entering the liquid discharge cavity through the liquid discharge port does not flow back to the liquid inlet, and further effectively avoids liquid discharge backflow.

[0018] Further, compared with setting the anti-backflow component to include only one blade, setting the anti-backflow component to include multiple blades can further improve the liquid discharge flow, better avoid affecting the liquid discharge flow due to the setting of the anti-backflow component, improve the liquid discharge efficiency, and avoid the phenomenon of pipe blockage.

[0019] Still further, by setting the support member, the blade can be supported against the support member, so that the blade is always subjected to an upward supporting force, and when the liquid flows back from the liquid discharge port into the liquid discharge cavity, the blade can be more easily inwardly folded by the buoyancy of the liquid, thereby improving the anti-backflow sensitivity of the anti-backflow component.

[0020] Still further, by setting the detection member, it can be detected whether the blade is inwardly folded to close the liquid discharge cavity, so that the liquid discharge condition can be monitored in real time, and the liquid discharge abnormality can be monitored.

[0021] Still further, by setting the sealing member, when the blade is inwardly folded and closes the liquid discharge cavity, the sealing member can seal the gap between the adjacent two blades, preventing the liquid flowing back from the liquid discharge port from flowing back to the liquid inlet through the gap between the adjacent two blades, thereby effectively improving the backflow prevention effect of the liquid discharge anti-backflow device.

[0022] In addition, the cleaning equipment for a solar cell provided by the present application on the basis of the above technical solution includes the above-mentioned liquid discharge anti-backflow device, and thus has the beneficial effects of the above-mentioned liquid discharge anti-backflow device. Compared with the cleaning equipment before the improvement, the cleaning equipment of the present application is less likely to cause backflow of waste liquid and less likely to cause the phenomenon of pipe blockage, and is more helpful to reduce the generation of defective wafers during the cleaning process of the wafers, and can also prevent the problem of chemical liquid pollution and reduce the energy consumption of chemicals. BRIEF DESCRIPTION OF DRAWINGS

[0023] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0024] Figure 1 is a structural schematic diagram of the liquid discharge anti-backflow device of the present application;

[0025] Figure 2is Figure 1 is a schematic view of a cross-sectional structure along line A-A in

[0026] Figure 3 is a schematic view of a partial structure of a cleaning device for a solar cell according to the present application.

[0027] List of reference signs:

[0028] 1, backflow prevention device; 11, liquid discharge pipe; 111, liquid inlet; 112, liquid discharge port; 113, liquid discharge cavity; 114, liquid inlet connector; 115, liquid discharge connector; 121, blade; 122, support member; 13, detection member; 14, connecting member; 2, tank body; 3, waste liquid pipe; 31, first pipe body; 32, second pipe body. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0030] It should be noted that in the description of the present application, the terms "upper", "lower", "inner", "outer", "top", etc. indicating the direction or positional relationship of the terms are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not intended to indicate or imply that the device or element 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", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The present application will be further described below in conjunction with the specific embodiments. It should be understood that these specific embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0033] Specifically, please refer to Figure 1 and Figure 2 , Figure 1 is a schematic view of a structure of a backflow prevention device according to the present application, Figure 2 is Figure 1 is a schematic view of a cross-sectional structure along line A-A in

[0034] As Figure 1 and Figure 2As shown, the application provides a backflow prevention device 1 for liquid discharge, which comprises a liquid discharge pipe 11 and a backflow prevention assembly, wherein the liquid discharge pipe 11 has oppositely arranged liquid inlet 111, liquid discharge outlet 112 and liquid discharge cavity 113 between the liquid inlet 111 and the liquid discharge outlet 112.

[0035] The backflow prevention assembly is arranged in the liquid discharge cavity 113, and is configured to be opened under the positive action of the liquid flowing from the liquid inlet 111 and closed under the reverse action of the liquid flowing back from the liquid discharge outlet 112.

[0036] By arranging the backflow prevention assembly, on the one hand, the liquid discharge cavity 113 can be opened under the positive action of the liquid flowing from the liquid inlet 111 when discharging liquid, so that the waste liquid is smoothly discharged through the liquid discharge outlet 112, avoiding affecting the liquid discharge flow and further avoiding the phenomenon of pipe blockage; on the other hand, when backflow occurs, the liquid discharge cavity 113 can be closed under the reverse action of the liquid flowing back from the liquid discharge outlet 112, so that the liquid entering the liquid discharge cavity 113 through the liquid discharge outlet 112 does not flow back to the liquid inlet 111, thereby effectively avoiding backflow of the liquid discharge, and the backflow prevention device 1 for liquid discharge of the application has simple structure, is convenient to use, does not introduce metal substances, and avoids affecting the cleaning effect of the silicon wafer.

[0037] It should be noted that in actual application, the specific setting shape of the liquid discharge cavity 113 is not limited in the application, for example, the cross section of the liquid discharge cavity 113 can be circular, or the cross section of the liquid discharge cavity 113 can be square, or the liquid discharge cavity 113 can be conical or other special-shaped, etc., and such adjustment and change of the specific setting shape of the liquid discharge cavity 113 does not deviate from the principles and scope of the application, and should be included in the protection scope of the application.

[0038] Exemplarily, as shown in Figure 2 the cross section of the liquid discharge cavity 113 is square.

[0039] It should be noted that in actual application, the specific setting type of the backflow prevention assembly is not limited in the application, as long as it can open the liquid discharge cavity 113 under the positive action of the liquid flowing from the liquid inlet 111 and close the liquid discharge cavity 113 under the reverse action of the liquid flowing back from the liquid discharge outlet 112.

[0040] In one specific embodiment, as shown in Figure 1 and Figure 2As shown, the anti-backflow assembly includes a plurality of blades 121 arranged in sequence along the circumference of the liquid inlet 111 within the liquid discharge cavity 113. The fixed end of the blade 121 is pivotally connected to the top of the liquid discharge cavity 113, and the movable end of the blade 121 extends into the liquid discharge cavity 113. When the blade 121 is inwardly retracted, the blade 121 closes the liquid discharge cavity 113.

[0041] In another specific embodiment, the anti-backflow assembly includes only one blade adapted to the liquid inlet 111. The fixed end of the blade is pivotally connected to the top of the liquid discharge cavity 113, and the movable end of the blade extends into the liquid discharge cavity 113. When liquid flows back from the liquid discharge port 112 into the liquid discharge cavity 113, the movable end of the blade moves towards the liquid inlet 111 and blocks the liquid inlet 111.

[0042] It should be noted that, although the anti-backflow assembly is introduced in the above two embodiments, compared with the form of setting the anti-backflow assembly to include only one blade, the form of setting the anti-backflow assembly to include a plurality of blades 121 can further improve the liquid discharge flow, better avoid the influence of the anti-backflow assembly on the liquid discharge flow, improve the liquid discharge efficiency, and avoid the phenomenon of pipe blockage.

[0043] Of course, preferably, as shown in Figure 1 and Figure 2 As shown, the anti-backflow assembly includes a plurality of blades 121 arranged in sequence along the circumference of the liquid inlet 111 within the liquid discharge cavity 113. The fixed end of the blade 121 is pivotally connected to the top of the liquid discharge cavity 113, and the movable end of the blade 121 extends into the liquid discharge cavity 113. When the blade 121 is inwardly retracted, the blade 121 closes the liquid discharge cavity 113.

[0044] It should be noted that, when liquid flows back from the liquid discharge port 112 into the liquid discharge cavity 113, the movable end of the blade 121 is floated upward and retracted inward due to the action of the buoyancy, and the plurality of blades 121 are sequentially connected to prevent the liquid in the liquid discharge cavity 113 from flowing back into the liquid inlet 111, thereby closing the liquid discharge cavity 113.

[0045] It should also be noted that the present application does not limit the specific number of blades 121. For example, the number of blades 121 can be set to 2, 3, 4, 5, 6 or more. Such adjustment and change of the specific number of blades 121 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0046] Exemplarily, the number of blades 121 is 8.

[0047] Preferably, as shown in Figure 2As shown, the liquid drainage anti-backflow device 1 of the present application further comprises a connecting piece 14, one end of the connecting piece 14 is connected with the top of the liquid drainage cavity 113, and the other end of the connecting piece 14 is connected with the fixed end of the blade 121.

[0048] By arranging the connecting piece 14, the fixed end of the blade 121 is pivotally connected with the top of the liquid drainage cavity 113, so as to facilitate the folding and opening of the blade 121.

[0049] It should be noted that in actual application, the specific arrangement type of the connecting piece 14 is not limited in the present application, for example, the connecting piece 14 can be arranged as a rotary hinge to pivotally connect the fixed end of the blade 121 with the top of the liquid drainage cavity 113, or the connecting piece 14 can be arranged as a hinge to pivotally connect the fixed end of the blade 121 with the top of the liquid drainage cavity 113, and the like, and such adjustment and change of the specific arrangement type of the connecting piece 14 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0050] Exemplarily, the connecting piece 14 is a rotary hinge.

[0051] It should be noted that in actual application, the specific arrangement material of the blade 121 is not limited in the present application, for example, the blade 121 can be arranged as a plastic material, or the blade 121 can be arranged as a metal material, and the like, and such adjustment and change of the specific material of the blade 121 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0052] Preferably, the material of the blade 121 is a plastic material.

[0053] By such arrangement, compared with the form of arranging the blade 121 as a metal material, arranging the blade 121 as a plastic material can avoid the metal substance flowing back into the cleaning tank with the waste liquid, and reduce the possibility of forming black spots during the cleaning of the silicon wafer, so that arranging the blade 121 as a plastic material can help to improve the yield of the silicon wafer.

[0054] Preferably, the anti-backflow assembly of the present application further comprises a sealing piece (not shown in the figure), which is arranged to seal the gap between the adjacent two blades 121 when the blades 121 are folded inward and the liquid drainage cavity 113 is closed.

[0055] By arranging the sealing piece, when the blades 121 are folded inward and the liquid drainage cavity 113 is closed, the sealing piece can seal the adjacent two blades 121, preventing the liquid flowing back from the liquid drainage port 112 from flowing reversely to the liquid inlet port 111 through the gap between the adjacent two blades 121, so as to effectively improve the anti-backflow effect of the liquid drainage anti-backflow device 1.

[0056] It should be noted that in actual applications, the sealing member can be arranged as a sealing strip arranged at the edge of the blade 121, or can be arranged as a sealing sleeve arranged outside the blade 121, or can be arranged in any other possible form, and the like, and the adjustment and change of the specific arrangement type of the sealing member do not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0057] Preferably, the sealing member is a sealing strip arranged at the edge of the blade 121.

[0058] It should be noted that in actual applications, the sealing member can be arranged as a sealing strip arranged at the edge of the blade 121, or can be arranged as a sealing sleeve arranged outside the blade 121, or can be arranged in any other possible form, and the like, and the adjustment and change of the specific arrangement type of the sealing member do not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0059] Preferably, the sealing member is a sealing strip arranged at the edge of the blade 121.

[0060] Preferably, as shown in Figure 1 and Figure 2 The anti-backflow assembly of the present application further comprises a supporting member 122, which abuts against the blade 121 to tilt the movable end of the blade 121 inwardly.

[0061] By arranging the supporting member 122, the blade 121 can abut against the supporting member 122, so that the blade 121 is always subjected to an upward supporting force, and when the liquid flows back from the liquid discharge port 112 into the liquid discharge cavity 113, the blade 121 can be more easily tilted inwardly by the buoyancy of the liquid, thereby improving the anti-backflow sensitivity of the anti-backflow assembly.

[0062] It should be noted that the present application does not make any limitation on the specific arrangement form of the supporting member 122, for example, the supporting member 122 can be arranged as a plurality of supporting blocks, which are arranged one-to-one corresponding to the blades 121, or can be arranged as a supporting ring, in which the blades 121 are located, and the like, and the adjustment and change of the specific arrangement form of the supporting member 122 do not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0063] Preferably, as shown in Figure 1 and Figure 2 The supporting member 122 comprises a plurality of supporting blocks, which are arranged one-to-one corresponding to the blades 121.

[0064] By setting the support blocks to correspond to the vanes 121, support can be formed for each vane 121, so that each vane 121 is subjected to an upward supporting force, and when liquid flows back from the liquid discharge port 112 into the liquid discharge cavity 113, all the vanes 121 can be inwardly retracted to close the liquid discharge cavity 113.

[0065] Preferably, as shown in the drawings, the liquid discharge backflow prevention device 1 of the present application further comprises a detection member 13 for detecting whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113. Figure 1

[0066] By providing the detection member 13, it can be detected whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113, so that the liquid discharge condition can be monitored in real time, and abnormal liquid discharge phenomena can be monitored.

[0067] It should be noted that in actual application, the present application does not make any limitation on the specific setting type of the detection member 13, as long as it can detect whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113. For example, the detection member 13 can be set as a photoelectric sensor or a position sensor, the position information of the vanes 121 is detected by the photoelectric sensor or the position sensor to determine whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113, or the detection member 13 can be set as a pressure sensor, the specific position of the vanes 121 is determined by the value of the pressure sensor, and then it is determined whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113, or the detection member 13 can be set as a camera, the picture taken by the camera is used to determine whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113, and the like. Such adjustment and change of the specific setting type of the detection member 13 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0068] Preferably, the detection member 13 comprises at least one of a pressure sensor, a photoelectric sensor, a position sensor or a camera.

[0069] It should be noted that in actual application, the present application does not make any limitation on the specific setting position of the detection member 13, as long as it can detect whether the vanes 121 are inwardly retracted to close the liquid discharge cavity 113. Such adjustment and change of the specific setting position of the detection member 13 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0070] In one specific embodiment, as shown in the drawings, the detection member 13 is arranged on the inner wall of the liquid discharge cavity 113. Figure 1

[0071] ​​In another specific embodiment, the detecting member 13 is arranged on the supporting member 122 and the detecting member 13 is arranged one-to-one with the leaf 121 (not shown in the figure).

[0072] It should be noted that in actual application, the leaf 121 can be arranged in a flat plate shape, or can be arranged in a stepped shape, or can be arranged in any other possible form, etc., and such adjustment and change of the specific shape of the leaf 121 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0073] Preferably, the leaf 121 is in a stepped shape.

[0074] By arranging the leaf 121 in a stepped shape, the sensitivity of the leaf 121 to the buoyancy rising can be improved, and when the liquid flows back into the drainage cavity 113 from the drainage port 112, the plurality of leaves 121 can be more closely connected to improve the sealing effect of the drainage cavity 113, and better avoid liquid backflow.

[0075] In a second aspect, the present application also provides a cleaning device for a solar cell.

[0076] Specifically, please refer to Figure 3 , Figure 3 which is a partial structure schematic diagram of the cleaning device for a solar cell of the present application.

[0077] As Figure 3 shown, the cleaning device comprises a tank 2, a waste liquid pipe 3, and the drainage anti-backflow device 1 introduced in the first aspect, wherein the liquid inlet 111 is in communication with the tank 2, and the drainage port 112 is in communication with the waste liquid pipe 3.

[0078] It should be noted that in actual application, the present application does not make any limitation on the specific arrangement position of the drainage anti-backflow device, as long as the liquid inlet 111 can be in communication with the tank 2 and the drainage port 112 can be in communication with the waste liquid pipe 3, for example, the drainage anti-backflow device 1 can be arranged in series on the waste liquid pipe 3, or the drainage anti-backflow device 1 can be arranged between the tank 2 and the waste liquid pipe 3, and the liquid inlet 111 of the drainage anti-backflow device 1 is in communication with the tank 2, and the drainage port 112 of the drainage anti-backflow device 1 is in communication with the waste liquid pipe 3, etc., and such adjustment and change of the specific arrangement position of the drainage anti-backflow device 1 does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0079] Preferably, as Figure 3 shown, the waste liquid pipe 3 is in communication with the tank 2, and the drainage anti-backflow device 1 is arranged in the waste liquid pipe 3.

[0080] Specifically, asFigure 3 As shown in the drawings, the two ends of the liquid discharge pipe 11 are respectively provided with a liquid inlet connector 114 and a liquid discharge connector 115, wherein the liquid inlet connector 114 is formed with a liquid inlet 111, and the liquid discharge connector 115 is formed with a liquid discharge port 112, and the waste liquid pipe 3 comprises a first pipe body 31 and a second pipe body 32, wherein the first end of the first pipe body 31 is in communication with the tank 2, the liquid inlet connector 114 is connected with the second end of the first pipe body 31, and the liquid discharge connector 115 is connected with the second pipe body 32.

[0081] Preferably, the cleaning device of the present application further comprises an alarm device (not shown in the drawings), which is in communication connection with the detection member 13 of the liquid discharge anti-backflow device 1.

[0082] By setting the alarm device and setting the alarm device in communication connection with the detection member 13 of the liquid discharge anti-backflow device 1, when the detection member 13 detects that the blade 121 is inwardly folded to close the liquid discharge cavity 113, the signal can be transmitted to the alarm device in time, and the alarm device issues an alarm, so as to facilitate the operator to monitor the abnormal liquid discharge in time, and avoid affecting the normal operation of the cleaning device due to the backflow of the liquid discharge.

[0083] It should be noted that in actual application, the alarm device can be set as a sound alarm module, or the alarm device can be set as a light alarm module, or the alarm device can be set as a combination of a sound alarm module and a light alarm module, etc., and such adjustment and change of the specific setting type of the alarm device does not deviate from the principles and scope of the present application, and should be included in the protection scope of the present application.

[0084] Exemplarily, the alarm device is a sound alarm module.

[0085] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the present application, and the technical solutions after such changes or replacements will fall within the protection scope of the present application.

Claims

1. A backflow prevention device for draining a fluid, characterized by comprising: The backflow prevention device for liquid discharge comprises: a liquid discharge pipe having a liquid inlet, a liquid outlet and a liquid discharge cavity between the liquid inlet and the liquid outlet; a backflow prevention assembly arranged in the liquid discharge cavity, the backflow prevention assembly being configured to open the liquid discharge cavity under the positive action of liquid flowing in from the liquid inlet and to close the liquid discharge cavity under the reverse action of liquid flowing back from the liquid outlet.

2. The backflow prevention device of claim 1, wherein The backflow prevention assembly comprises a plurality of blades arranged in sequence along the circumference of the liquid inlet in the liquid discharge cavity, the fixed end of each blade being pivotally connected to the top of the liquid discharge cavity, and the movable end of each blade extending into the liquid discharge cavity, the blades closing the liquid discharge cavity when the blades are inwardly folded.

3. The backflow prevention device of claim 2, wherein The backflow prevention assembly further comprises a support member abutting against the blades to cause the movable end of each blade to be inwardly inclined.

4. The backflow prevention device of claim 3, wherein The support member comprises a plurality of support blocks arranged one-to-one corresponding to the blades. Alternatively, the support member is a support ring, and the blades are located in the support ring when installed.

5. The backflow prevention device of claim 3, wherein The backflow prevention device for liquid discharge further comprises a detection member for detecting whether the blades are inwardly folded to close the liquid discharge cavity.

6. The backflow prevention device of claim 5, wherein The detection member comprises at least one of a pressure sensor, a photoelectric sensor, a position sensor or a camera.

7. The backflow prevention device of claim 5, wherein The detection member is arranged in the liquid discharge cavity. And / or, the detection member is arranged on the support member.

8. The backflow prevention device of claim 2, wherein The backflow prevention assembly further comprises a sealing member arranged to seal the gap between two adjacent blades when the blades are inwardly folded and the liquid discharge cavity is closed.

9. A cleaning apparatus for solar cells, characterized by, The cleaning device comprises a tank, a waste liquid pipe and the backflow prevention device for liquid discharge according to any one of claims 1 to 8, wherein the liquid inlet is in communication with the tank, and the liquid outlet is in communication with the waste liquid pipe.

10. The cleaning apparatus for solar cells according to claim 9, wherein The cleaning device further comprises an alarm device in communication connection with the detection member of the backflow prevention device for liquid discharge.

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