Sewage circulating filtering device with hollow shaft motor for cleaning

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a sewage circulating and filtering device with a hollow shaft motor for cleaning, which comprises a water containing tank body, a filtering structure, a circulating structure and the hollow shaft motor, the water containing tank body is used for containing clear water and recycled sewage; the filtering structure comprises a filter element and a water collecting tray; the circulating structure comprises a reclaimed water outlet pipe, a sewage inlet pipe and a pump body; the hollow shaft motor comprises a motor body and a hollow shaft; a first connecting part and a second connecting part which can be communicated with the outside are arranged at two ends of the hollow shaft; the first connecting part is fixedly connected with a connecting flange of the filtering structure; and the second connecting part is of a split joint structure. According to the utility model, the rotary power can be provided for the filtering structure to clean the filter element, and the sealing can be realized through the split joint structure to discharge and use the filtered reclaimed water again; the structure is simple, the application scene is wide, frequent water changing and filter element changing are not needed, and the cleaning efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to a sewage circulation filtering device, in particular to a cleaning sewage circulation filtering device with a hollow shaft motor, belonging to the technical field of sewage treatment. Background Art

[0002] In the development of the cleaning industry, such as in cleaning scenarios such as floor scrubbers and car washes, the recycling of cleaning water has always been a problem that needs to be solved in the industry at home and abroad. In the case of floor scrubbers, the demand for increased floor scrubber operating time can only be met by increasing the volume of the water tank. Increasing the water tank is equivalent to increasing its own weight, which will cause the risk of damage to the ground. At the same time, it requires the cooperation of other power sources, and it is even more difficult to save water. Especially with the increasing development of automation and intelligent technology, in the field of cleaning, whether it is traditional cleaning or the development of unmanned automated cleaning robots, the key issue is the realization of a recycling filtration system for cleaning sewage, that is, obtaining recycled water that can be used for cleaning again through recycling and filtration of sewage.

[0003] If recycled water cannot be recycled, the cleaning robot or floor scrubber will need to return to the workstation to add and drain water after about half an hour of work, which will greatly reduce its working capacity. It will also be necessary to frequently clean the filter element, which wastes time. Cleaning the filter element requires more water, which is time-consuming and labor-intensive.

[0004] The core issue restricting sewage circulation and filtration is the effective application time of the filter element device. To address this problem, existing technologies, such as Chinese Patent Publication No. CN116850785A, disclose a sewage circulation and filtration device for cleaning and an autonomous driving floor scrubber using the device. These devices propose two methods of self-cleaning the filter element: rotating the filter element device or forming a vortex through a rotating water disc, thereby achieving the effect of long-term water circulation.

[0005] However, in practical applications, it has been found that rotating filter elements offer greater filtration effectiveness than vortex-type elements, and placement at the bottom of the tank offers even better results. If the filter element is placed at the top of the tank, once the water level decreases to a certain level, the filter element will partially lose contact with the wastewater, rendering the filtration ineffective. When the filter element is placed at the bottom of the tank, connecting the clean water pipe from the bottom is a reasonable approach. Connecting it from the top can cause problems such as entanglement between the clean water outlet pipe and the filter element.

[0006] Therefore, in the present technical field, there is a need for a clean sewage circulation filtering device that can satisfy both the rotation of the filter element device and the formation of a sealed connection between the water outlet and the filter element device. Utility Model Content

[0007] The utility model mainly solves the above-mentioned technical problems and provides a cleaning sewage circulation filtering device with a hollow shaft motor, which can provide rotational force for the filter element device while forming a sealed connection between the water outlet and the filter element device, and avoid problems such as entanglement between the water outlet pipe and the filter element.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A sewage circulation and filtering device for cleaning with a hollow shaft motor comprises a water storage tank, a filtering structure arranged inside the water storage tank, a circulation structure arranged outside the water storage tank, and a hollow shaft motor arranged outside the water storage tank;

[0010] The water tank is used for storing initial clean water and recycled sewage;

[0011] The filtration structure includes a filter element and a water collection tray; wherein the filter element is a filamentous hollow fiber membrane; the water collection tray is a hollow structure with a regenerated water outlet, and the water collection tray is also provided with a regenerated water inlet integrated with the filter element; the water collection tray is provided with a connecting flange;

[0012] The circulation structure includes a sewage inlet pipe connected to the regenerated water outlet pipe and the water storage tank, and a pump body, the pump body is used to draw or absorb water;

[0013] The hollow shaft motor includes a motor body and a hollow shaft; the hollow shaft is driven by the output shaft of the motor body, and the axis of the hollow shaft is not parallel to the axis of the output shaft of the motor body; a cover is provided outside the output shaft of the motor body and the hollow shaft; a first connection part and a second connection part that can be connected to the outside are provided at both ends of the hollow shaft; the first connection part is a mechanically fixed connection structure, which is fixed to the connecting flange and is sealed and connected to the regenerated water outlet, and is used to transmit rotational power to the filtering structure; the second connection part is a split joint structure, which is used to connect to the external non-rotating end, that is, used to connect to the regenerated water outlet pipe.

[0014] Preferably, the cover body includes an upper cover body and a lower cover body; the upper cover body is provided with a protrusion along the axis direction of the hollow shaft, and a hollow shaft bearing support is provided in the protrusion; the hollow shaft is sleeved in the cover body through a bearing; the bottom end of the lower cover body is provided with a water outlet joint;

[0015] Preferably, the split joint structure includes a static ring part, a dynamic ring part and a clamping device; the lower cover is provided with a first slot; the static ring part is arranged in the first slot; the hollow shaft is provided with a second slot at the second connecting part end; the inner wall of the first slot is provided with an axial long groove, and a hollow boss block is provided inside the first slot; the outer wall of the hollow boss block is provided with a convex block; the convex block is inserted into the long groove to form a sliding structure; the top of the hollow boss block is provided with an annular groove;

[0016] The stationary ring portion includes a stationary ring block; the stationary ring block is arranged in the annular groove of the hollow boss block; the dynamic ring portion includes a dynamic ring block; the dynamic ring block is sleeved in the second slot and fixed by a pin structure;

[0017] The clamping device includes a first clamping spring and a second clamping spring; the first clamping spring is sleeved on the hollow boss block and is clamped by the first slot bottom of the lower cover body; the second clamping spring is arranged between the upper cover body and the lower cover body, and the upper cover body and the lower cover body are connected by bolts, and a spring compression margin is provided between the connecting surfaces, which is used to provide clamping force to the static ring part and the dynamic ring part again by continuing to tighten the bolts after the elasticity of the first clamping spring is reduced.

[0018] Preferably, the split joint structure includes a static ring part, a dynamic ring part and a clamping device; the static ring part is a first hollow circular ring block; the dynamic ring part is a second hollow circular ring block; the clamping device is a third clamping spring; the second connecting part end of the hollow shaft is provided with a first shaft shoulder; the interior of the lower cover body is provided with an annular groove, and the bottom surface of the annular groove is provided with an internal thread; the water outlet joint is screwed to the internal thread; the first hollow circular ring block is sleeved in the annular groove; the second hollow circular ring block is sleeved on the outer periphery of the hollow shaft end, and the second hollow circular ring block rotates synchronously with the hollow shaft; the third clamping spring is arranged between the second hollow circular ring block and the first shaft shoulder of the hollow shaft, and the second hollow circular ring block is limited by the third clamping spring.

[0019] Preferably, annular grooves are provided at the contact surfaces of the static ring block and the dynamic ring block, and docking sealing rings are provided in the annular grooves; the docking sealing rings are made of ceramic, alloy steel or graphene.

[0020] Preferably, the hollow shaft is fixedly sleeved with a first bevel gear; the output shaft of the motor body is fixedly sleeved with a second bevel gear; and the first bevel gear is meshed with the second bevel gear.

[0021] Preferably, the first connecting portion is a hollow boss shaft structure, the cross section of which is a regular polygon and can be directly plugged into a connecting flange provided on the water collecting tray.

[0022] Preferably, a primary filtration structure is further provided in the water storage tank; the primary filtration structure is arranged below the outlet of the sewage inlet pipe and is provided with a filter net for preliminarily filtering large particles and hair in the sewage flowing back from the sewage inlet pipe into the water storage tank.

[0023] Preferably, the split joint structure includes an oil seal ring; the oil seal ring is sleeved in the lower cover body, and the inner ring of the oil seal ring is sleeved on the end of the second connecting portion of the hollow shaft.

[0024] The utility model provides a sewage circulation and filtering device for cleaning with a hollow shaft motor, which has the following beneficial effects:

[0025] (1) The cleaning sewage circulation filter device is designed with a hollow shaft structure, which can not only provide rotational power for the filter structure to clean the filter element, but also achieve sealing through the split joint structure to discharge the filtered recycled water for reuse; and the structural design of the motor shaft and the hollow shaft is not coaxial, so that even if the hollow shaft bites, it will not cause damage to the motor, avoid power loss, and facilitate maintenance;

[0026] (2) The cleaning sewage circulation and filtration device has a simple structure and can be used in a wide range of scenarios. It can perform cleaning work for a long time without the need for frequent water changes or filter element replacements, greatly improving cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation or description of the prior art.

[0028] Figure 1 This is a schematic diagram of the overall structure of the cleaning sewage circulation filtration device provided by the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the utility model after the water tank is hidden and displayed;

[0030] Figure 3 This is a schematic diagram of the filter structure of the utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the hollow shaft motor of the utility model;

[0032] Figure 5 This is a schematic diagram of the cover structure of the utility model;

[0033] Figure 6 This is a schematic diagram of the disassembled structure of the components in the lower cover of the utility model;

[0034] Figure 7 This is a schematic diagram of the hollow shaft structure of the utility model;

[0035] Figure 8 This is a schematic diagram of the installation structure of the dynamic ring block and the hollow shaft of the utility model;

[0036] Figure 9 This is a schematic diagram of the disassembled structure of the hollow shaft motor of the utility model;

[0037] Figure 10 A schematic diagram of the disassembled structure of a hollow shaft motor provided in Example 2 of the present utility model;

[0038] Figure 11 for Figure 10 A in the middle is an enlarged schematic diagram;

[0039] Figure 12 This is a schematic diagram of the disassembled structure of the lower cover body of Example 2 of the utility model;

[0040] Figure 13 This is a schematic diagram of the installation of the split joint structure and the lower cover provided in Example 3 of the present utility model.

[0041] Legend:

[0042] 1-water tank; 2-filtration structure; 21-filter element; 22-water collection tray; 23-recycled water outlet; 24-recycled water inlet; 25-connecting flange; 3-circulation structure; 31-recycled water outlet pipe; 32-sewage inlet pipe; 4-hollow shaft motor; 41-motor body; 42-hollow shaft; 421-second slot; 43-cover; 431-upper cover; 432-lower cover; 4321-first slot; 43 22-hollow boss block; 4323-bump; 4324-annular groove; 433-raised portion; 434-water outlet joint; 44-static ring block; 45-dynamic ring block; 46-first compression spring; 47-second compression spring; 48-oil seal ring; 5-primary filter structure; 61-first hollow circular ring block; 62-second hollow circular ring block; 63-third compression spring; 64-first shaft shoulder; 66-annular groove; 67-internal thread. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Example 1, see Figure 1 and Figure 2 A sewage circulation and filtration device for cleaning with a hollow shaft motor comprises a water tank body 1, a filtration structure 2 disposed in the water tank body 1, a circulation structure 3 disposed outside the water tank body 1, and a hollow shaft motor 4 disposed outside the water tank body 1;

[0045] The water tank 1 is used for storing initial clean water and recycled sewage;

[0046] See also Figure 3The filtering structure 2 includes a filter element 21 and a water collecting tray 22; wherein the filter element 21 is a filamentous hollow fiber membrane ultrafiltration; the water collecting tray 22 is a hollow structure provided with a regenerated water outlet 23, and the water collecting tray 22 is also provided with a regenerated water inlet 24 integrated and connected with the filter element 21; the outer end surface of the water collecting tray 22 is provided with a hollow connecting flange 25;

[0047] See also Figure 2 The circulation structure 3 includes a regenerated water outlet pipe 31 indirectly connected to the regenerated water outlet 23, a sewage inlet pipe 32 connected to the water tank 1, a pump body provided on the regenerated water outlet pipe 31, and a sewage suction pump body provided on the sewage inlet pipe 32;

[0048] See also Figure 4 The hollow shaft motor 4 includes a motor body 41 and a hollow shaft 42; the hollow shaft 42 is driven by the output shaft of the motor body 41, and the axis of the hollow shaft 42 is not parallel to the axis of the output shaft of the motor body 41; a cover 43 is provided outside the output shaft of the motor body 41 and the hollow shaft 42; both ends of the hollow shaft 42 are provided with a first connection part and a second connection part that can be communicated with the outside; the first connection part is a mechanical fixed connection structure, fixedly connected to the connection flange 25, and sealed and connected to the regenerated water outlet 23, for transmitting rotational power to the filtering structure 2; the second connection part is a split joint structure, for communicating with the external non-rotating end, that is, for communicating with the regenerated water outlet pipe 31;

[0049] See also Figure 5 Preferably, the cover body 43 includes an upper cover body 431 and a lower cover body 432; the upper cover body 431 is provided with a protrusion 433 along the axis direction of the hollow shaft 42, and a hollow shaft bearing support is provided in the protrusion 433; the hollow shaft 42 is sleeved in the cover body 43 through a bearing; the bottom end of the lower cover body 432 is provided with a water outlet joint 434;

[0050] See also Figure 5-Figure 9 Preferably, the split joint structure includes a static ring part, a dynamic ring part and a pressing device; the lower cover 432 is provided with a first slot 4321; the static ring part is arranged in the first slot 4321; the hollow shaft 42 is provided with a second slot 421 at the second connecting part end; the inner wall of the first slot 4321 is provided with an axial long groove, and a hollow boss block 4322 is provided inside the first slot 4321; the outer wall of the hollow boss block 4322 is provided with a boss 4323; the boss 4323 is inserted into the long groove to form a sliding structure; the top of the hollow boss block 4322 is provided with an annular groove 4324;

[0051] The stationary ring portion includes a stationary ring block 44; the stationary ring block 44 is disposed in the annular groove 4324 of the hollow boss block 4322; the dynamic ring portion includes a dynamic ring block 45; the dynamic ring block 45 is sleeved in the second slot 421 and fixed by a pin structure;

[0052] The clamping device includes a first compression spring 46 and a second compression spring 47; the first compression spring 46 is sleeved on the hollow boss block 4322 and is compressed by the bottom of the first slot 4321 of the lower cover 432; the second compression spring 47 is arranged between the upper cover 431 and the lower cover 432, and the upper cover 431 and the lower cover 432 are connected by bolts. A spring compression margin is provided between the connection surfaces to provide a compression force to the static ring part and the dynamic ring part again by continuing to tighten the bolts after the elasticity of the first compression spring 46 decreases;

[0053] Preferably, annular grooves are provided at the contact surfaces of the static ring block 44 and the dynamic ring block 45 , and butt sealing rings are provided in the annular grooves; the butt sealing rings are made of ceramic, alloy steel or graphene.

[0054] Preferably, the hollow shaft 42 is fixedly sleeved with a first bevel gear; the output shaft of the motor body 41 is fixedly sleeved with a second bevel gear; the first bevel gear is meshed with the second bevel gear.

[0055] Preferably, the first connecting portion is a hollow boss shaft structure, the cross section of which is a regular polygon and can be directly plugged into the connecting flange 25 provided on the water collecting tray 22 .

[0056] Preferably, a primary filter structure 5 is further provided in the water storage tank 1; the primary filter structure 5 is arranged below the outlet of the sewage inlet pipe 32 and is provided with an 80-mesh filter screen for preliminarily filtering large particles and hair in the sewage flowing back from the sewage inlet pipe 32 into the water storage tank 1.

[0057] The working principle of the cleaning sewage circulation filter device with a hollow shaft motor provided in this embodiment is as follows:

[0058] Before the cleaning process begins, clean water is injected into the water tank 1. Then, the pump body connected to the regenerated water outlet pipe 31 begins pumping water. The water in the water tank 1 passes through the filter element 21, the regenerated water inlet 24, the water collection tray 22, the regenerated water outlet 23, the hollow shaft 42, and the outlet connector 434, and is finally discharged from the regenerated water outlet pipe 31 for cleaning. The used sewage is drawn into the water tank 1 by the pump body connected to the sewage inlet pipe 32, and is initially filtered by the primary filter structure 5 to remove hair and other large particles of debris. The drawn sewage enters the circulation system. As the cleaning process progresses, the turbidity of the sewage in the water tank 1 increases, and the filter holes of the filter element 21 may become clogged. By setting a switch or timing function, the motor body 41 is activated, and the filter structure is rotated forward and reversely to clean the filter element 21, thereby maintaining the effective operation of the filter element 21. With the long-term use of the cleaning sewage circulation filter device, the static ring block 44 and the dynamic ring block 45 will be worn, or the elasticity of the first clamping spring 46 will decrease, resulting in water leakage. By continuing to tighten the bolts, the static ring part and the dynamic ring part can be provided with clamping force again, which can extend the service life of the entire equipment.

[0059] Example 2, see Figure 10-12 , which is different from Example 1 in that the split joint structure is designed. The split joint structure includes a static ring part, a dynamic ring part and a clamping device; the static ring part is a first hollow circular ring block 61; the dynamic ring part is a second hollow circular ring block 62; the clamping device is a third clamping spring 63; the second connecting portion end of the hollow shaft 42 is provided with a first shaft shoulder 64; the lower cover 432 is provided with an annular groove 66 inside, and the bottom surface of the annular groove 66 is provided with an internal thread 67; the water outlet joint 434 is screwed to the internal thread 67; the first hollow circular ring block 61 is sleeved on the annular groove 6 6; the second hollow ring block 62 is sleeved on the outer periphery of the end of the hollow shaft 42, and the second hollow ring block 62 is sleeved on the outer periphery of the end of the hollow shaft 42 through a rubber sealing sleeve, and the rubber sealing sleeve and the outer circumferential surface of the hollow shaft 42 and the outer circumferential surface of the second hollow ring block 62 are all tightly sealed; the second hollow ring block 62 rotates synchronously with the hollow shaft 42; the third compression spring 63 is arranged between the second hollow ring block 62 and the first shaft shoulder 64 of the hollow shaft 42, and the second hollow ring block 62 is limited by the third compression spring 63 to avoid axial movement of the second hollow ring block 62 during use.

[0060] In this embodiment, the compression between the static ring part and the dynamic ring part is jointly controlled by the screwing in of the third compression spring 63 and the water outlet joint 434. That is, when the compression force of the static ring part and the dynamic ring part is insufficient, the water outlet joint 434 can be further tightened to push the first hollow circular ring block 61 toward the second hollow circular ring block 62, which can still provide compression force for the static ring part and the dynamic ring part, thereby extending the service life of the entire equipment.

[0061] Example 3, see Figure 10 When there is no need for a large flow rate of water at the regenerated water outlet pipe 31, that is, when the water suction pressure between the hollow shaft 42 and the regenerated water outlet pipe 31 is low, an oil seal can be used for sealing, and the split joint structure includes an oil seal ring 48; the oil seal ring 48 is sleeved in the lower cover body 432, and the inner ring of the oil seal ring 48 is sleeved on the second connecting part end of the hollow shaft 42. The oil seal ring 48 can adopt a skeleton seal, and its inner ring is provided with a spring ring for compression; the oil seal ring 48 can also adopt a double-lip oil seal, a pan plug seal, etc.

[0062] It should be noted that the wastewater circulation and filtration device with a hollow shaft motor provided by this utility model can be used not only in floor scrubbers but also in car washes and other applications requiring filtration and circulation of clean water. It can also be used in other non-circulating filtration applications to achieve slag and juice separation. Furthermore, if damage to the motor caused by hollow shaft leakage is not a concern or other protective measures are not implemented, the hollow shaft and motor can also be designed with parallel shafts, or a parallel gear or belt drive can be used.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A sewage circulation and filtering device for cleaning with a hollow shaft motor, comprising a water storage tank (1), characterized in that: It also includes a filtering structure (2) arranged in the water tank (1), a circulation structure (3) arranged outside the water tank (1), and a hollow shaft motor (4) arranged outside the water tank (1); The filtering structure (2) comprises a filter element (21) and a water collecting tray (22); wherein the filter element (21) is a filamentous hollow fiber membrane; the water collecting tray (22) is a hollow structure provided with a regenerated water outlet (23); the water collecting tray (22) is also provided with a regenerated water inlet (24) integrally connected to the filter element (21); the water collecting tray (22) is provided with a connecting flange (25) on the outside; The circulation structure (3) comprises a regenerated water outlet pipe (31), a sewage inlet pipe (32) connected to the water storage tank (1), and a pump body; The hollow shaft motor (4) comprises a motor body (41) and a hollow shaft (42); the hollow shaft (42) is driven by the output shaft of the motor body (41), and the axis of the hollow shaft (42) is not parallel to the axis of the output shaft of the motor body (41); a cover (43) is provided outside the output shaft of the motor body (41) and the hollow shaft (42); a first connecting portion and a second connecting portion that can be communicated with the outside are provided at both ends of the hollow shaft (42); the first connecting portion is a mechanical fixed connection structure, fixedly connected to the connecting flange (25), and sealed and communicated with the regenerated water outlet (23); the second connecting portion is a split joint structure.

2. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 1, characterized in that: The cover body (43) comprises an upper cover body (431) and a lower cover body (432); the upper cover body (431) is provided with a raised portion (433) along the axial direction of the hollow shaft (42), and a hollow shaft bearing support is provided in the raised portion (433); the hollow shaft (42) is sleeved in the cover body (43) via a bearing; and a water outlet joint (434) is provided at the bottom end of the lower cover body (432).

3. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 2, characterized in that: The split joint structure comprises a static ring portion, a dynamic ring portion and a pressing device; the lower cover (432) is provided with a first slot (4321); the static ring portion is arranged in the first slot (4321); the hollow shaft (42) is provided with a second slot (421) at the second connecting portion end; The inner wall of the first slot (4321) is provided with an axial long groove, and a hollow boss block (4322) is provided inside the first slot (4321); the outer wall of the hollow boss block (4322) is provided with a convex block (4323); the convex block (4323) is inserted into the long groove to form a sliding structure; the top of the hollow boss block (4322) is provided with an annular groove (4324); The stationary ring portion includes a stationary ring block (44); the stationary ring block (44) is arranged in the annular groove (4324) of the hollow boss block (4322); The dynamic ring portion includes a dynamic ring block (45); the dynamic ring block (45) is sleeved in the second slot (421) and fixed by a pin structure; The clamping device includes a first clamping spring (46) and a second clamping spring (47); the first clamping spring (46) is sleeved on the hollow boss block (4322) and is clamped by the bottom of the first slot (4321) of the lower cover body (432); the second clamping spring (47) is arranged between the upper cover body (431) and the lower cover body (432); the upper cover body (431) and the lower cover body (432) are connected by bolts, and a spring compression margin is provided between the connection surfaces.

4. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 2, characterized in that: The split joint structure comprises a stationary ring part, a dynamic ring part and a pressing device; the stationary ring part is a first hollow circular ring block (61); the dynamic ring part is a second hollow circular ring block (62); the pressing device is a third pressing spring (63); the second connecting portion end of the hollow shaft (42) is provided with a first shaft shoulder (64); the lower cover (432) is provided with an annular groove (66) inside, and the bottom surface of the annular groove (66) is provided with an internal thread (67); the water outlet joint (434) is screwed to the internal thread (67); The first hollow annular block (61) is sleeved in the annular groove (66); The second hollow annular block (62) is sleeved on the outer periphery of the end of the hollow shaft (42), and the second hollow annular block (62) rotates synchronously with the hollow shaft (42); The third compression spring (63) is arranged between the second hollow annular block (62) and the first shaft shoulder (64) of the hollow shaft (42), and the second hollow annular block (62) is limited by the third compression spring (63).

5. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 1, characterized in that: The hollow shaft (42) is fixedly sleeved with a first bevel gear; the output shaft of the motor body (41) is fixedly sleeved with a second bevel gear; the first bevel gear is meshed with the second bevel gear.

6. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 1, characterized in that: The first connecting portion is a hollow boss shaft structure, and its cross section is a regular polygon.

7. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 3, characterized in that: The contact surfaces of the static ring block (44) and the dynamic ring block (45) are both provided with an annular groove, and a butt sealing ring is provided in each annular groove; the butt sealing ring is made of ceramic, alloy steel or graphene.

8. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 1, characterized in that: A primary filter structure (5) is also provided in the water storage box (1); the primary filter structure (5) is arranged below the outlet of the sewage inlet pipe (32) and is provided with a filter screen.

9. The cleaning sewage circulation and filtering device with a hollow shaft motor according to claim 2, characterized in that: The split joint structure comprises an oil seal ring (48); the oil seal ring (48) is sleeved in the lower cover (432), and the inner ring of the oil seal ring (48) is sleeved on the end of the second connecting portion of the hollow shaft (42).

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