A cleaning machine

Abstract

This invention relates to a washing machine, comprising a sink body with a drain outlet and a drain cavity connected below the drain outlet at its bottom. It also includes: a return water pipe, with a return water outlet located beside the drain outlet at the bottom of the sink body; the return water pipe being outside the sink body and connecting the drain cavity to the return water outlet; a cover for opening or closing the return water outlet; an elastic element; a spray arm with a water inlet on its bottom wall and a guide sleeve extending downward around the water inlet; and a support sleeve, the upper end of which is rotatably connected to the lower end of the guide sleeve, the lower end of which is detachably connected to the return water outlet. When the support sleeve is connected to the return water outlet, the cover is pressed into the return water pipe by the lower end of the support sleeve, thereby connecting the spray arm to the return water pipe. When the support sleeve is detached from the return water outlet, the cover closes the return water outlet under the drive of the elastic element. This invention facilitates switching between dishwasher and ordinary sink use, making it convenient to use.

Description

Technical Field

[0001] This invention relates to the field of dishwasher technology, specifically to a cleaning machine. Background Technology

[0002] Currently, most kitchens have two sinks. If a sink-type dishwasher is installed, one sink is used as a regular sink, and the other is used as the dishwasher's washing tub. The washing tub has a spray system installed and cannot be used as a regular sink.

[0003] The applicant's earlier application CN202010900533.0, "A Washing Basket and a Sink with the Washing Basket," discloses a structure that allows the sink to be used as a dishwasher or as a regular sink. The washing basket includes a basket body with a washing chamber. The basket body has a flow channel extending from the bottom to the side. Spray holes are formed on the inner wall of the basket body for water to be sprayed out of the flow channel. A recessed circular water-drawing area is provided at the bottom of the basket body, which is connected to the flow channel. An impeller is provided in the water-drawing area to pump water from the bottom of the basket body into the flow channel. In use, the impeller rotates, drawing water from the bottom of the basket into the flow channel on the side of the basket, and further spraying the fruits, vegetables, or dishes in the basket through the spray holes. The washing basket and sink are easily integrated; placing the basket in the sink and closing the lid allows it to be used as an automatic dishwasher. When not needed, the basket is removed from the sink along with the lid, allowing it to be used as a regular sink.

[0004] The above structure is very convenient when switching between a dishwasher and a regular sink. However, when used as a dishwasher, it requires a specially structured cleaning basket and a complex drive mechanism installed at the bottom of the sink. The overall structure is complex and the production cost is high. At the same time, when using the cleaning basket, the water flow system inside the basket is independent of the sink, making it difficult to filter and collect residue, resulting in inconvenient residue removal. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cleaning machine that integrates a water return system while retaining the original sink shape, thereby simplifying the overall structure, reducing costs, and facilitating switching between dishwasher and ordinary sink use, in light of the current state of the technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A cleaning machine includes a water tank body, the bottom of which is provided with a drain outlet and a drain cavity connected below the drain outlet, and further includes:

[0008] The water return pipe has a water return port located next to the drain outlet at the bottom of the water tank body. The water return pipe is located outside the water tank body and is used to connect the drain chamber to the water return port.

[0009] A cover, which can be moved up and down, is provided at the return water inlet to open or close the return water inlet;

[0010] An elastic element ensures that the cover always tends to move upwards, thereby closing the return water outlet;

[0011] A spray arm, the bottom wall of which is provided with a water inlet and a guide sleeve extending downward around the water inlet;

[0012] The upper end of the support sleeve is rotatably connected to the lower end of the guide sleeve, and the lower end of the support sleeve is detachably connected to the return water port. When the support sleeve is connected to the return water port, the cover is pressed into the return water pipe by the lower end of the support sleeve, thereby connecting the spray arm with the return water pipe. When the support sleeve is detached from the return water port, the cover closes the return water port under the drive of the elastic element.

[0013] Preferably, the upper part of the return water pipe is a vertical section extending downwards corresponding to the return water inlet, and the cover is movably disposed in this vertical section, with the elastic element disposed at the bottom of the cover. The aforementioned return water pipe not only serves for return water but also provides assembly space for the cover and the elastic element, resulting in a compact overall structure.

[0014] Preferably, the inner diameter of the vertical portion of the return water pipe is larger than the diameter of the return water inlet. The top of the cover is provided with a filling part that can be inserted into the return water inlet when it is closed. Below the filling part is a stop block that abuts against the bottom edge of the return water inlet. When the filling part is inserted into the return water inlet, the upper wall of the filling part is flush with the inner bottom wall of the water tank body to maintain the integrity of the original bottom wall of the water tank and maintain a good water guiding, filtering, and sludge collection effect.

[0015] Preferably, the inner bottom wall of the return water pipe is provided with a positioning post extending upwards corresponding to the return water inlet. Correspondingly, the lower part of the cover is provided with a guide sleeve that can be inserted into the positioning post. The elastic element is sleeved outside the positioning post and at least partially located within the guide sleeve. Preferably, the upper diameter of the positioning post is smaller than the lower diameter, thus forming a support platform at the joint. The lower end of the elastic element abuts against this support platform, and the upper end abuts against the inner top wall of the guide sleeve. This structure helps improve the installation stability of the elastic element and the cover.

[0016] Preferably, the lower part of the return water pipe is a horizontal section that bends horizontally to one side from the lower end of the vertical section and extends therein, with a smooth transition between the vertical and horizontal sections. The positioning post is located at the smooth transition point between the vertical and horizontal sections. Positioned at this location, the positioning post can also guide the water flow upwards to a certain extent.

[0017] In this invention, the upper end of the support sleeve is provided with an adapter sleeve, the upper wall of which has an insertion interface for the lower end of the guide sleeve to be inserted. The outer peripheral wall of the lower end of the guide sleeve is provided with a protrusion that can rotate and engage with the inner top wall of the adapter sleeve. The top wall of the spray arm has several spray holes with different spray directions. Under the action of the spray water jet, the above structure facilitates the rotation and spraying of the spray arm.

[0018] Preferably, the outer peripheral wall of the lower part of the support sleeve is provided with an external thread, and correspondingly, the inner peripheral wall of the return water inlet is provided with an internal thread that matches the external thread. The support sleeve is constrained to the bottom wall of the water tank body through the mutual engagement of the external and internal threads. This structure facilitates the detachable connection of the support sleeve below the spray arm to the bottom of the water tank body. The outer peripheral wall of the support sleeve is also provided with a radially extending torsion arm. This structure facilitates the application of rotational force when installing the spray arm and the support sleeve.

[0019] Preferably, the lower end of the support sleeve is provided with a downwardly extending pressure foot for pressing against the upper wall of the cap. This structure can increase the downward displacement of the cap, thereby improving the water guiding effect.

[0020] Preferably, the inner bottom wall of the water tank body is provided with a partially recessed guide area surrounding the drain outlet. This structure helps to improve the sludge collection effect and the return water speed.

[0021] Preferably, a slag collection basket is provided in the drain chamber. When the spray arm and the return water inlet are connected, the drain chamber constitutes a return water chamber for the spray arm's water supply. This invention allows for an appropriately larger drain chamber. While retaining the original water tank shape, the slag collection basket can be used as both a filter screen and for slag collection, serving two purposes in one, simplifying the overall structure and making it easy to use.

[0022] Preferably, the bottom of the drain chamber is further provided with a drainage mechanism for quickly draining the water in the drain chamber, and a drain outlet is provided at the bottom of the drain chamber. The upper end of the drainage mechanism is connected to the drain outlet. This structure facilitates rapid water drainage and ensures that the sink body is free of residual water and remains clean.

[0023] Preferably, a heating element for heating the water passing through the drain cavity is provided in the drain cavity and / or on its outer peripheral wall. More preferably, a thick-film heating element for heating the water passing through the drain cavity is covered on the outer peripheral wall of the drain cavity. When the water tank body is used as a cleaning machine, the above structure can quickly heat the return water, thereby improving the heating effect; and, due to the use of a thick-film heating element covering the outer peripheral wall of the drain cavity, it is beneficial to improve heating efficiency and reduce heat loss; the heating element also heats the slag collection basket, which can also keep the slag collection basket dry and hygienic, sterilize and disinfect, and prevent bacterial growth.

[0024] In this invention, the lower water chamber and the return water pipe are connected by a return water drive mechanism, thereby providing power for the spray arm to spray water jets.

[0025] Preferably, the water return drive mechanism is a water pump, and a water guide pipe is arranged laterally on the side of the lower water chamber and connected to the water inlet of the water pump. The water outlet of the water pump is located at its top and connected to the lower end of the water return pipe.

[0026] Preferably, the first end of the water guide pipe is tangentially connected to the side of the lower water chamber, and the second end is connected to the water inlet of the water pump. This structure helps to reduce energy loss.

[0027] Preferably, the water guide pipe includes a first section, a second section, and a third section connected sequentially along the water flow direction, with their diameters gradually increasing. The inner portion of the first section is formed on the inner wall of the drain cavity and communicates with the drain cavity, while the outer portion protrudes outside the drain cavity. The second section is a tapered section with a gradually increasing inner diameter, and the portion near the water inlet is integrally formed with the drain cavity. The third section is a straight cylindrical section. This structure helps to accelerate the return water speed.

[0028] Preferably, the inner portion of the first section and the water inlet portion of the second section of the water guide pipe are arranged corresponding to the sidewall of the slag collection basket. A water inlet pipe is also connected to the sidewall of the lower water chamber, tangentially connected to the lower water chamber. Furthermore, the connection between the water inlet pipe and the lower water chamber is opposite to the connection between the water guide pipe and the lower water chamber, with the flow direction opposite. This creates opposing vortices during the water intake and return processes. On one hand, the formation of these vortices helps improve the efficiency of water intake and return; on the other hand, the slag collection basket placed inside the water cup is self-cleaning due to the scouring effect of the two opposing vortices.

[0029] Preferably, the slag collection basket is a cylindrical structure with a closed bottom and an open top, and the diameter of the slag collection basket gradually decreases from top to bottom. This structure helps to lock the residue at the bottom of the slag collection basket, improving the slag collection efficiency.

[0030] Preferably, the inner bottom wall of the water tank body is provided with a detachable end cap that can open or close the upper port of the drain chamber. When not in use, the drain outlet is closed to prevent odors from overflowing from the drain pipe.

[0031] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides a return water inlet and a return water pipe at the bottom of the sink body. When the sink body needs to be used as a dishwasher, the lower water chamber is used as a return water chamber, and the water in the lower water chamber flows back to the spray arm through the return water pipe and the return water inlet. When the sink body needs to be used as a regular sink, the water in the lower water chamber is directly discharged into the drain pipe, which facilitates switching between dishwasher and regular sink use and is convenient to use. Furthermore, compared with existing regular sinks, the only modification to the sink body of the present invention is the addition of a return water inlet, resulting in a simple overall structure and low modification cost. The spray arm is easy to operate through the connection structure between the support sleeve and the return water inlet. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention (showing the dishwasher in use);

[0033] Figure 2 This is a structural schematic diagram of an embodiment of the present invention (in the form of a regular water tank).

[0034] Figure 3 This is a schematic diagram of the structure of an embodiment of the present invention (in an unused state);

[0035] Figure 4 This is a schematic diagram of the structure of an embodiment of the present invention;

[0036] Figure 5 for Figure 4 A structural diagram from another angle;

[0037] Figure 6 for Figure 1 A sectional view;

[0038] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0039] Figure 8 This is a schematic diagram of the lower water cavity portion in an embodiment of the present invention;

[0040] Figure 9 for Figure 8 Another angle of the image. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] like Figures 1-9As shown, the cleaning machine in this embodiment includes a water tank body 1. The bottom of the water tank body 1 is provided with a drain outlet 11 and a drain cavity 12 connected below the drain outlet 11. A slag collection basket 2 is provided in the drain cavity 12, and a drain outlet 121 is provided at the bottom of the drain cavity 12.

[0043] like Figure 4 , 6 As shown, the bottom of the aforementioned sink body 1 is also provided with a return water inlet 13 and a return water pipe 14 connected below the return water inlet 13. The return water pipe 14 is located outside the sink body 1, and the lower water chamber 12 and the return water pipe 14 are connected by a return water drive mechanism 3. When the sink body 1 needs to be used as a dishwasher, the lower water chamber 12 is used as a return water chamber. The return water drive mechanism 3 pumps the water filtered by the slag collection basket 2 in the lower water chamber 12 back to the sink body 1 through the return water pipe 14 and the return water inlet 13. When the sink body 1 needs to be used as a regular sink, the water in the lower water chamber 12 after filtration and slag collection is directly discharged into the drain pipe through the drain outlet 121, which facilitates switching between dishwasher and regular sink use and is convenient to use. Moreover, compared with the existing regular sink, the modification in the sink body 1 of this embodiment is only the opening of the return water inlet 13, which makes the overall structure simple and the modification cost low. In order to meet the requirements of the return water chamber, the lower water chamber 12 can be appropriately enlarged to facilitate filtration and slag collection.

[0044] In this embodiment, the sink body 1 is equipped with a detachable spray arm 4. The bottom of the spray arm 4 has a water inlet 41 that can be connected to the return water inlet 13, and the top wall of the spray arm 4 has a spray hole 42. When the sink body 1 is used as a dishwasher, the spray arm 4 is installed to provide an upward spray of water, thereby expanding the spray range and improving the cleaning effect.

[0045] like Figure 6 , 7 As shown, a cover 5 is provided on the inner bottom wall of the water tank body 1, which can open or close the return water inlet 13. The cover 5 is movably positioned at the return water inlet 13. An elastic element 9 is provided at the bottom of the cover 5 to keep the cover 5 moving upward and thus closing the return water inlet 13. A guide sleeve 43 extending downward around the inlet 41 is provided on the bottom wall of the spray arm 4. A support sleeve 44 is provided below the guide sleeve 43, corresponding to the guide sleeve 43. The upper end of the support sleeve 44 is rotatably connected to the lower end of the guide sleeve 43, and the lower end of the support sleeve 44 is detachably connected to the return water inlet 13. When the support sleeve 44 is connected to the return water inlet 13, the cover 5 is pressed into the return water pipe 14 by the lower end of the support sleeve 44, thereby connecting the spray arm 4 to the return water pipe 14. When the support sleeve 44 is detached from the return water inlet 13, the cover 5 closes the return water inlet 13 under the drive of the elastic element 9.

[0046] Specifically, the upper part of the return water pipe 14 is a vertical section 141 extending downwards from the return water inlet 13. The cover 5 is movably disposed in this vertical section 141, and the elastic element 9 is disposed at the bottom of the cover 5. The aforementioned return water pipe 14 is not only used for return water, but also provides assembly space for the cover 5 and the elastic element 9, resulting in a compact overall structure.

[0047] The inner diameter of the vertical portion 141 of the return water pipe 14 is larger than the diameter of the return water inlet 13. The top of the cover 5 is provided with a filling part 51 that can be inserted into the return water inlet 13 when the return water inlet 13 is closed. Below the filling part 51, there are four blocks 52 that can abut against the bottom edge of the return water inlet 13. The blocks 52 are spaced apart around the circumference of the cover 5. The filling part 51 can move up and down in the return water pipe 14. When the filling part 51 moves upward to the top of the vertical portion 141 and is inserted into the return water inlet 13, the upper wall of the filling part 51 is flush with the inner bottom wall of the water tank body 1 to maintain the integrity of the original bottom wall of the water tank and maintain a good water guiding, filtering and sludge collection effect. When the filling part 51 moves downward to the middle of the vertical portion 141, the return water inlet 13 is opened.

[0048] A positioning post 140 extending upwards from the return water inlet 13 is provided on the inner bottom wall of the return water pipe 14. Correspondingly, a guide sleeve 54 is provided at the lower part of the cover 5 to engage with the positioning post 140. The elastic element 9 is a spring, sleeved outside the positioning post 140 and at least partially located in the guide sleeve 54. The upper diameter of the positioning post 140 is smaller than the lower diameter, thus forming a support platform 143 at the joint. The lower end of the elastic element 9 abuts against the support platform 143, and the upper end abuts against the inner top wall of the guide sleeve 54. The above structure helps to improve the installation stability of the elastic element 9 and the cover 5.

[0049] The lower part of the return water pipe 14 is a horizontal section 142 that bends horizontally to one side from the lower end of the vertical section 141 and extends thereto. The vertical section 141 and the horizontal section 142 transition smoothly, and the positioning column 140 is located at the smooth transition between the vertical section 141 and the horizontal section 142. Located at this location, the positioning column 140 can also guide the water flow upward to a certain extent.

[0050] like Figure 5 , 6 As shown, in this embodiment, the upper end of the support sleeve 44 is provided with an adapter sleeve 45, which is welded to the support sleeve 44. The upper wall of the adapter sleeve 45 has an insertion interface 451 for the lower end of the guide sleeve 43 to be inserted therein. The outer peripheral wall of the lower end of the guide sleeve 43 is provided with a protrusion 431 that can rotate and cooperate with the inner top wall of the adapter sleeve 45. The top wall of the spray arm 4 has several spray holes 42 with different spray directions. Under the action of the spray water column, the above structure facilitates the rotation and spraying of the spray arm 4.

[0051] The lower outer peripheral wall of the support sleeve 44 is provided with an external thread 440, and correspondingly, the inner peripheral wall of the return water inlet 13 is provided with an internal thread 130 that matches the external thread. The support sleeve 44 is constrained to the bottom wall of the water tank body 1 by the mutual engagement of the external and internal threads. This structure facilitates the detachable connection of the support sleeve 44 below the spray arm 4 to the bottom of the water tank body 1. The outer peripheral wall of the support sleeve 44 is also provided with a radially extending torsion arm 441. This structure facilitates the application of rotational force to the spray arm 4 and the support sleeve 44 during installation.

[0052] The lower end of the support sleeve 44 is provided with a downwardly extending pressure foot 442 for pressing against the upper wall of the cover 5. This structure can increase the downward displacement of the cover 5, thereby improving the water guiding effect.

[0053] In this embodiment, with the spray arm 4 and the return water inlet 13 connected, the lower water chamber 12 serves as the return water chamber for the water supplied by the spray arm 4. In this embodiment, the lower water chamber 12 can be appropriately enlarged to facilitate filtration and sludge collection while retaining the original water tank shape.

[0054] like Figure 4 As shown, in this embodiment, the return water drive mechanism 3 is a water pump. A horizontally arranged water guide pipe 122 is provided on the side of the lower water chamber 12 and connected to the water inlet of the water pump 3. The water outlet of the water pump is located at its top and connected to the lower end of the return water pipe 14. The return water pipe 14 is L-shaped, and the upper section arranged vertically is very short.

[0055] like Figure 8 , 9 As shown, the first end of the aforementioned water guide pipe 122 is tangentially connected to the side of the drain chamber 12, and the second end is connected to the inlet of the water pump. Specifically, the water guide pipe 122 includes a first section 1221, a second section 1222, and a third section 1223, which are connected sequentially along the water flow direction and have gradually increasing diameters. The inner part of the first section 1221 is formed on the inner wall of the drain chamber 12 and is continuous with the drain chamber 12, while the outer part protrudes outside the drain chamber 12. The second section 1222 is a tapered section with a gradually increasing inner diameter, and the part near the inlet end is integrally formed with the drain chamber 12. The third section 1223 is a straight cylindrical section. This structure is beneficial for accelerating the return water speed.

[0056] The inner portion of the first section 1221 and the water inlet portion of the second section 1222 of the aforementioned water guide pipe 122 are arranged corresponding to the side wall of the slag collection basket 2. A water inlet pipe 16 is also connected to the side wall of the lower water chamber 12. This water inlet pipe 16 is tangentially connected to the lower water chamber 12, and the connection between the water inlet pipe 16 and the lower water chamber 12 is opposite to the connection between the water guide pipe 122 and the lower water chamber 12, with the flow direction opposite. This structure allows for flushing of both sides of the slag collection basket 2 during water intake and return processes, thereby maintaining the cleanliness of the slag collection basket 2.

[0057] In this embodiment, the slag collection basket 2 is a cylindrical structure with a closed bottom and an open top, and the diameter of the slag collection basket 2 gradually decreases from top to bottom. This structure helps to lock the residue at the bottom of the slag collection basket 2, improving the slag collection effect. Figure 3 As shown, the inner bottom wall of the water tank body 1 is equipped with a detachable end cap 6 that allows the upper port of the drain chamber 12 to be opened or closed. When not in use, the drain outlet 11 is closed to prevent odors from overflowing from the drain pipe. The inner bottom wall of the water tank body 1 is provided with a partially recessed guide area 111 surrounding the drain outlet 11. This structure helps to improve the sludge collection effect and the return water speed.

[0058] In this embodiment, the bottom of the lower water chamber 12 is also provided with a drainage mechanism 7 for quickly draining the water in the lower water chamber 12. The upper end of the drainage mechanism 7 is connected to the drain outlet 121. The drainage mechanism 7 includes a drainage pump 71 and a traction valve 72, with the traction valve 72 connected between the drain outlet 121 and the drainage pump 71. The above structure facilitates the rapid drainage of water and achieves the effect of keeping the water tank body 1 clean with no residual water.

[0059] In this embodiment, as Figure 4 , 5 As shown, a heating element 8 for heating the water passing through the drain chamber 12 is provided on the outer peripheral wall of the drain chamber 12. This heating element 8 is a thick-film heating element covering the outer peripheral wall of the drain chamber 12. When the water tank body 1 is used as a cleaning machine, the above structure can quickly heat the return water, thereby improving the heating effect; and, since the thick-film heating element covering the outer peripheral wall of the drain chamber is used, it is beneficial to improve heating efficiency and reduce heat loss; the heating element also heats the slag collection basket, which can also keep the slag collection basket dry and hygienic, sterilize and disinfect, and prevent bacterial growth.

[0060] The top of the sink body 1 is provided with a flip-up door for opening or closing the top opening of the sink body 1.

[0061] When using the cleaning machine of this embodiment, if the sink body 1 needs to be used as a regular sink, the spray arm 4 is removed, and the cover 5 automatically moves upward under the action of the elastic member 9 to close the return water port 13. At this time, the upper wall of the cover 5 constitutes part of the lower wall of the sink body 1. The overall shape of the sink body 1 is the same as that of a regular sink. The washing water is filtered and collected by the sludge collection basket 2 and then discharged into the drain pipe through the drain outlet 121. If the sink body 1 needs to be used as a dishwasher, the support sleeve 44 carrying the spray arm 4 is threaded into the return water port 13. The cover 5 moves downward under the pressure of the pressure foot 442 to open the return water port 13, so that the return water pipe 14 is connected to the spray arm 4. Under the action of the return water drive mechanism 3, spray cleaning can be realized. After cleaning, the last water is discharged into the drain pipe through the drain outlet 12.

[0062] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A cleaning machine, comprising a water tank body (1), wherein the bottom of the water tank body (1) is provided with a drain outlet (11) and a drain cavity (12) connected below the drain outlet (11), characterized in that: Also includes The water return pipe (14) has a water return port (13) located next to the drain outlet (11) at the bottom of the water tank body (1). The water return pipe (14) is located outside the water tank body (1) and is used to connect the drain chamber (12) and the water return port (13). The cover (5) is movable up and down at the return water inlet (13) and is used to open or close the return water inlet (13); The elastic element (9) keeps the cover (5) moving upward to close the return water inlet (13); The spray arm (4) has an inlet (41) and a guide sleeve (43) extending downward around the inlet (41) on its bottom wall. A support sleeve (44) is provided, the upper end of which is rotatably connected to the guide sleeve (43), and the lower end of which is detachably connected to the return water port (13). When the support sleeve (44) is connected to the return water port (13), the cover (5) is pressed into the return water pipe (14) by the lower end of the support sleeve (44), thereby connecting the spray arm (4) with the return water pipe (14). When the support sleeve (44) is disconnected from the return water port (13), the cover (5) closes the return water port (13) under the drive of the elastic element (9).

2. The cleaning machine according to claim 1, characterized in that: The upper part of the return water pipe (14) is a vertical part (141) extending downwards from the corresponding return water inlet (13). The cover (5) is movable up and down in the vertical part (141), and the elastic element (9) is located at the bottom of the cover (5).

3. The cleaning machine according to claim 2, characterized in that: The inner diameter of the vertical portion (141) of the return water pipe (14) is larger than the diameter of the return water inlet (13). The top of the cover (5) is provided with a filling part (51) that can be inserted into the return water inlet (13) when the return water inlet (13) is closed. Below the filling part (51) is a stop block (52) that can abut against the bottom edge of the return water inlet (13).

4. The cleaning machine according to claim 2, characterized in that: The inner bottom wall of the return water pipe (14) is provided with a positioning post (140) extending upward from the corresponding return water port (13). Correspondingly, the lower part of the cover (5) is provided with a guide sleeve (54) that can be inserted into the positioning post (140). The elastic element (9) is sleeved outside the positioning post (140) and is at least partially located in the guide sleeve (54).

5. The cleaning machine according to claim 4, characterized in that: The upper diameter of the positioning post (140) is smaller than the lower diameter, thus forming a support platform (143) at the joint. The lower end of the elastic member (9) abuts against the support platform (143), and the upper end abuts against the inner top wall of the guide sleeve (54).

6. The cleaning machine according to claim 4, characterized in that: The lower part of the return water pipe (14) is a horizontal part (142) that bends horizontally to one side from the lower end of the vertical part (141) and extends thereto. The vertical part (141) and the horizontal part (142) are smoothly transitioned. The positioning post (140) is located at the smooth transition between the vertical part (141) and the horizontal part (142).

7. The cleaning machine according to any one of claims 1 to 6, characterized in that: The upper end of the support sleeve (44) is provided with an adapter sleeve (45), and the upper wall of the adapter sleeve (45) has an insertion interface (451) for the lower end of the flow guide sleeve (43) to be inserted therein. The outer peripheral wall of the lower end of the flow guide sleeve (43) is provided with a protrusion (431) that can rotate and cooperate with the inner top wall of the adapter sleeve (45).

8. The cleaning machine according to any one of claims 1 to 6, characterized in that: The lower outer peripheral wall of the support sleeve (44) is provided with an external thread (440), and correspondingly, the inner peripheral wall of the return water port (13) is provided with an internal thread (130) that can match the external thread. The support sleeve (44) is constrained on the bottom wall of the water tank body (1) by the mutual cooperation of the external thread and the internal thread.

9. The cleaning machine according to claim 8, characterized in that: The outer peripheral wall of the support sleeve (44) is also provided with a radially extending torsion arm (441).

10. The cleaning machine according to any one of claims 1 to 6, characterized in that: The lower end of the support sleeve (44) is provided with a pressure foot (442) that extends downward and is used to press against the upper wall of the cover (5).

11. The cleaning machine according to any one of claims 1 to 6, characterized in that: The inner bottom wall of the water tank body (1) is provided with a flow guiding area (111) that is partially recessed around the drain outlet (11).

12. The cleaning machine according to any one of claims 1 to 6, characterized in that: The drain chamber (12) is provided with a slag collection basket (2). When the spray arm (4) and the return water port (13) are connected, the drain chamber (12) is configured as a return water chamber for water supply to the spray arm (4).

13. The cleaning machine according to claim 12, characterized in that: The bottom of the drain chamber (12) is also provided with a drainage mechanism (7) for quickly draining the water in the drain chamber (12). The bottom of the drain chamber (12) is provided with a drain outlet (121). The upper end of the drainage mechanism (7) is connected to the drain outlet (121).

14. The cleaning machine according to claim 12, characterized in that: The drain chamber (12) and / or the outer peripheral wall of the drain chamber (12) are provided with a heating element (8) for heating the water passing through the drain chamber (12).

15. The cleaning machine according to any one of claims 1 to 6, characterized in that: The lower water chamber (12) and the return water pipe (14) are connected by a return water drive mechanism (3).

16. The cleaning machine according to claim 15, characterized in that: The water return drive mechanism (3) is a water pump. A water guide pipe (122) is arranged horizontally on the side of the lower water chamber (12) and connected to the water inlet end of the water pump. The water outlet end of the water pump is located at its top and connected to the lower end of the water return pipe (14).

17. The cleaning machine according to claim 16, characterized in that: The first end of the water guide pipe (122) is tangentially connected to the side of the lower water chamber (12), and the second end is connected to the water inlet of the water pump.

18. The cleaning machine according to claim 17, characterized in that: The water guide pipe (122) includes a first section (1221), a second section (1222), and a third section (1223) that are connected sequentially along the water flow direction and have gradually increasing diameters. The inner part of the first section (1221) is formed on the inner wall of the drain cavity (12) and is connected to the drain cavity (12), while the outer part protrudes outside the drain cavity (12). The second section (1222) is a tapered section with gradually increasing inner diameter, and the part near the water inlet end is formed as one piece with the drain cavity (12). The third section (1223) is a straight cylindrical section.

19. The cleaning machine according to claim 18, characterized in that: The lower water chamber (12) is provided with a slag collection basket (2), and the inner part of the first section (1221) and the water inlet part of the second section (1222) of the water guide pipe (122) are arranged corresponding to the side wall of the slag collection basket (2).

20. The cleaning machine according to claim 19, characterized in that: The side wall of the lower water chamber (12) is also connected to the water inlet pipe (16), which is tangentially connected to the lower water chamber (12). Furthermore, the connection between the water inlet pipe (16) and the lower water chamber (12) is arranged opposite to the connection between the water guide pipe (122) and the lower water chamber (12), and the flow direction is opposite.

21. The cleaning machine according to claim 19, characterized in that: The slag collection basket (2) is a cylindrical structure with a closed bottom and an open top, and the diameter of the slag collection basket (2) gradually decreases from top to bottom.

22. The cleaning machine according to any one of claims 1 to 6, characterized in that: The inner bottom wall of the water tank body (1) is provided with a detachable end cap (6) that can open or close the upper port of the lower water chamber (12).

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