Cat litter basin

Abstract

The utility model discloses a cat litter basin which comprises a basin body provided with a containing cavity with an upward opening. The cover body is arranged on the basin body and at least partially covers the opening of the accommodating cavity to form an accommodating space; the fan is arranged on the basin body or the cover body, and the air suction end or the air exhaust end of the fan faces the containing space; the filter part is located on a gas path driven by the fan, the filter part comprises a honeycomb base material made of a polypropylene material, the whole surface of the honeycomb base material is provided with an active coating, and the active coating comprises colloid, a solid catalytic precursor and a solid inducer, and the solid catalytic precursor and the solid inducer are arranged in the colloid; when a fan drives gas in the accommodating space to pass through the filtering piece, the gas can generate strong chemical action with peculiar smell molecules adsorbed on the surface of the active coating by utilizing high oxidizability and strong electronegativity of catalytic active components in the active coating, and chemical bonds of peculiar smell groups such as amino groups and sulfydryl groups in the peculiar smell molecules are weakened; the broken bond is converted into an odorless compound, so that the effect of removing the peculiar smell of the excrement in the cat litter basin is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pet products, in particular to a cat litter box. Background Art

[0002] With the development of social and economic levels, more and more people are starting to keep pets, and cats and dogs are among the more popular pets. For example, cats have the habit of burying their excrement, so cat owners usually provide them with a litter box, which is a convenient container for cats. After cats excrete feces or urine, the excrement combines with the cat litter to form clumps. The excrement releases ammonia gas over a long period of time. Ammonia has a low olfactory threshold and a distinct odor, which can cause malodor pollution. Malodorous gases can irritate the human olfactory organs, causing discomfort and polluting the living environment.

[0003] Currently, there are several common methods: the first is to use activated carbon materials to absorb some of the pollutant molecules, but the adsorption effect of activated carbon is relatively general. When the adsorption reaches saturation, it is prone to desorption, causing secondary pollution. The second is to use an ozone generator to produce ozone, using the strong oxidizing properties of ozone to achieve sterilization and disinfection. However, the ozone generator must be operated in an unmanned space, otherwise it may cause harm to the human body and even poisoning in serious cases. The third is to use plasma or negative ions to achieve sterilization and disinfection. The above methods are not very effective in purifying ammonia produced by pet excrement. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems in the prior art. To this end, the utility model provides a cat litter box that can effectively remove ammonia generated by excrement.

[0005] According to an embodiment of the present invention, a cat litter box includes: a basin body, the basin body having a cavity opening upward; a cover body, which is arranged on the basin body and at least partially covers the opening of the cavity to form an accommodating space; a fan, which is arranged on the basin body or the cover body, and the air intake end or the air exhaust end of the fan is toward the accommodating space; a filter element, which is located on the gas path driven by the fan, and the filter element includes a honeycomb substrate made of polypropylene, and the entire surface of the honeycomb substrate is provided with an active coating, and the active coating includes a colloid and a solid catalytic precursor and a solid inducer arranged in the colloid; the solid catalytic precursor is selected from one or more of ferric sulfate, potassium permanganate, phosphomolybdic acid, silicomolybdic acid, silicotungstic acid and phosphotungstic acid, the solid inducer is selected from one or more of sodium carbonate, sodium citrate and urea, and the colloid is nanoalumina colloid or nanoalumina colloidal colloid.

[0006] A cat litter box according to an embodiment of the present invention has at least the following beneficial effects:

[0007] The cat litter box with the above structure has a honeycomb substrate made of polypropylene coated with an active coating placed on the gas path driven by a fan. When the fan drives the gas in the accommodating space through the above-mentioned filter element, the high oxidizing property and strong electronegativity of the catalytic active components in the active coating can produce a strong chemical reaction with the odor molecules adsorbed on its surface, and by weakening the chemical bonds of odor groups such as amino and thiol groups in the odor molecules, the broken bonds are converted into odorless compounds, thereby achieving the effect of removing the odor of excrement in the cat litter box.

[0008] In some embodiments of the present invention, the mass ratio of the honeycomb substrate to the active coating is (5-20):(80-95).

[0009] In some embodiments of the present invention, a mounting port connected to the accommodating space is opened on the top of the cover body, a box body is installed at the mounting port, the fan is arranged in the box body with the air intake end facing downward, the side of the box body is provided with an exhaust port connecting the exhaust end of the fan with the outside, the box body is provided with a switch mechanism for opening or closing the exhaust port, the box body is provided with a return port connected to the exhaust end of the fan and facing downward, and the box body is provided with a partition separating the return port and the air intake end of the fan so that the gas in the accommodating space can circulate.

[0010] In some embodiments of the present invention, the box body is provided with a gas pipe facing the exhaust port corresponding to the exhaust end of the fan, and the switching mechanism can be moved to abut against the port of the gas pipe. The port of the gas pipe has a notch portion, and a ventilation gap connected to the return port can be formed between the notch portion and the switching mechanism.

[0011] In some embodiments of the present invention, an inner shell is provided in the box body, the fan is provided in the inner shell, the gas pipeline is formed on the side of the inner shell, the bottom wall of the inner shell is provided with an air inlet facing the suction end of the fan, the inner shell is provided with an outer sleeve portion located on the outer periphery of the gas pipeline, the switching mechanism can simultaneously abut against the port of the gas pipeline and the port of the outer sleeve portion, and the side wall of the outer sleeve portion is provided with a connecting port connecting the ventilation gap with the return port.

[0012] In some embodiments of the present invention, the end of the gas pipe connected to the inner shell is in the shape of a trumpet that gradually shrinks in the direction away from the fan, the connecting port is formed on the lower side wall of the outer sleeve portion, and the connecting port gradually expands from top to bottom, and the dimension of the connecting port extending radially parallel to the outer sleeve portion is greater than the diameter dimension of the outer sleeve portion.

[0013] In some embodiments of the present invention, the box body includes a bottom plate and a cover body arranged on the bottom plate, the inner shell body is arranged inside the cover body, the bottom plate is provided with a mounting frame located below the inner shell body, the partition is formed inside the mounting frame to separate a first area connected to the suction end of the fan and a second area connected to the return port, the first area and the second area are both provided with a plate-shaped filter element, an inlet hole is provided on the bottom plate corresponding to the first area, and an outlet hole is provided on the bottom plate corresponding to the second area.

[0014] In some embodiments of the present invention, two ribs for supporting the inner shell are spaced apart on the bottom plate, a draw-out opening is provided on the side wall of the cover body between the two ribs, the mounting frame is slidably embedded between the two ribs to move in and out of the draw-out opening, and limiting protrusions for clamping and fixing the filter element are provided on the inner walls on both sides of the opposite sides of the mounting frame, and there is a height gap between the limiting protrusion at the lower end and the bottom plate.

[0015] In some embodiments of the present invention, the switch mechanism includes a push plate slidably arranged on the inner side wall of the box body, the side plate of the box body is provided with a waist-shaped hole pointing to the exhaust port, and the push plate is provided with a sliding key extending from the waist-shaped hole to slide back and forth along the waist-shaped hole.

[0016] In some embodiments of the present invention, a mounting ring is detachably connected to the mounting port, and a hook part that can be engaged with the inner edge of the mounting port is provided on the side of the mounting ring through rotation of an elastic part. The lower end of the inner peripheral edge of the mounting ring is formed with an inwardly protruding annular support plate, and the box body is embedded in the annular support plate.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a structural schematic diagram of an embodiment of a cat litter box of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the structural decomposition of an embodiment;

[0021] Figure 3 for Figure 1Schematic diagram of the structure of the embodiment after removing the basin body and the cover body;

[0022] Figure 4 for Figure 1 A schematic diagram of the interior cross section of an embodiment with the basin, cover, housing, and mounting ring removed;

[0023] Figure 5 It is a structural diagram of the combination of the inner shell, the gas pipeline and the outer sleeve;

[0024] Figure 6 A top view of an embodiment of a filter element.

[0025] Reference numerals:

[0026] Basin body 100; cavity 110; cover body 200; mounting opening 210; fan 300; filter element 400; box body 500; exhaust port 510; return port 520; partition 530; gas duct 540; notch portion 541; bottom plate 550; inlet hole 551; outlet hole 552; rib plate 553; cover body 560; drawer opening 561; switch mechanism 600; inner shell 700; air inlet 710; outer sleeve portion 720; connecting opening 730; mounting frame 800; limiting protrusion 810; mounting ring 910; hook member 920; annular support plate 930. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside", are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] See also Figures 1 to 6 The present invention provides a cat litter box, comprising: a basin body 100, the basin body 100 having a cavity 110 opening upward; a cover body 200, disposed on the basin body 100, at least partially covering the opening of the cavity 110 to form a storage space; a fan 300, disposed on the basin body 100 or the cover body 200, the air intake end or the air exhaust end of the fan 300 facing the storage space; a filter element 400, located on a gas path driven by the fan 300, the filter element 400 comprising a honeycomb substrate made of polypropylene, the entire surface of the honeycomb substrate being provided with an active coating, the active coating comprising a colloid and a solid catalytic precursor and a solid inducer disposed in the colloid; the solid catalytic precursor being selected from one or more of ferric sulfate, potassium permanganate, phosphomolybdic acid, silicomolybdic acid, silicotungstic acid, and phosphotungstic acid; the solid inducer being selected from one or more of sodium carbonate, sodium citrate, and urea; and the colloid being nanoalumina colloid or nanoalumina colloidal colloid.

[0032] The cat litter box with the above structure has a honeycomb substrate made of polypropylene coated with an active coating placed on the gas path driven by the fan 300. When the fan 300 drives the gas in the accommodating space to pass through the above-mentioned filter element 400, the high oxidizing property and strong electronegativity of the catalytic active components in the active coating can produce a strong chemical reaction with the odor molecules adsorbed on its surface, and by weakening the chemical bonds of odor groups such as amino and thiol groups in the odor molecules, the broken bonds are converted into odorless compounds, thereby achieving the effect of removing the odor of excrement in the cat litter box.

[0033] Specifically, the above-mentioned filter element 400 can be manufactured in the following manner: first, the solid catalytic precursor and the solid inducer are ground and mixed evenly to obtain a solid mixture, and then a liquid soft template is added to the colloidal aqueous solution and mixed evenly, and then the solid mixture is slowly added and stirred thoroughly to allow the reaction to be complete to obtain a slurry; finally, the honeycomb substrate of polypropylene material is immersed in the slurry, and then taken out and heat-treated in the air to obtain the filter element 400.

[0034] In some embodiments of the present invention, the mass ratio of the honeycomb substrate to the active coating is (5-20):(80-95). It is understood that too little active coating will reduce the efficiency of removing odor pollutants, while too much active coating will cause the active component particles on the surface of the material to overlap and aggregate, also reducing the efficiency of removing odor pollutants. Experiments have shown that when the mass ratio of the honeycomb substrate to the active coating satisfies the above relationship, good deodorization effects can be achieved.

[0035] See also Figures 2 to 4 In some embodiments of the present invention, a mounting opening 210 communicating with the accommodating space is provided at the top of the cover body 200, a box body 500 is installed at the mounting opening 210, the fan 300 is arranged in the box body 500 with the air intake end facing downward, an exhaust port 510 connecting the exhaust end of the fan 300 with the outside is provided on the side of the box body 500, a switch mechanism 600 for opening or closing the exhaust port 510 is provided on the box body 500, the box body 500 is provided with a return port 520 communicating with the exhaust end of the fan 300 and facing downward, and the box body 500 is provided with a partition 530 separating the return port 520 and the air intake end of the fan 300, so that the gas in the accommodating space can circulate. It should be noted that when the cat litter box needs to process the internal gas and discharge it to the outside, the switch mechanism 600 opens the exhaust port 510. Driven by the fan 300, the gas in the storage space is sucked upward and passes through the filter element 400 before being discharged directly from the exhaust port 510. Under normal circumstances, the gas can be completely discharged from the exhaust port 510 without passing through the return port 520. When the cat litter box needs to process the internal gas to form an internal circulation, so that the gas undergoes multiple filtering reactions and avoids any pollution to the external environment, the switch mechanism 600 closes the exhaust port 510. Driven by the fan 300, the gas in the storage space is sucked upward and passes through the filter element 400. Since the exhaust port 510 is in the closed state, the gas will return to the storage space through the return port 520, thereby forming a clockwise circulation in the up-down direction. The above structure can achieve gas discharge or internal circulation on the basis of removing odor molecules in the gas, which is suitable for different usage scenarios, with a simple structure and easy use.

[0036] It should be noted that, in other embodiments, the installation port 210 can also be set on the side of the cover body 200, and the exhaust port 510 can also be set on the top of the cover body 200. According to specific usage requirements, the positions of the installation port 210 and the exhaust port 510 can be arranged accordingly.

[0037] See also Figure 2 、 Figure 3 and Figure 4 In some embodiments of the present invention, the box body 500 is provided with a gas pipe 540 at the exhaust end corresponding to the fan 300, facing the exhaust port 510. The switch mechanism 600 can be moved to abut against the end of the gas pipe 540. The end of the gas pipe 540 has a notch 541. A ventilation gap connected to the return port 520 can be formed between the notch 541 and the switch mechanism 600. It is understandable that if only the exhaust port 510 is blocked, turbulence will be generated when the gas passing through the filter element 400 passes through the exhaust port 510, and the gas will easily flow around and generate loud noise. However, when the switch mechanism 600 is moved to abut against the end of the gas pipe 540, the gas can be diverted from the ventilation gap to the return port 520, and then return to the accommodating space after passing through the return port 520, thereby reducing gas turbulence and noise.

[0038] See also Figure 3 and Figure 4 In some embodiments of the present invention, an inner shell 700 is provided in the box body 500, the fan 300 is provided in the inner shell 700, the gas pipeline 540 is formed on the side of the inner shell 700, and the bottom wall of the inner shell 700 is provided with an air inlet 710 facing the suction end of the fan 300, and the inner shell 700 is provided with an outer sleeve portion 720 located on the outer periphery of the gas pipeline 540, and the switch mechanism 600 can simultaneously abut against the port of the gas pipeline 540 and the port of the outer sleeve portion 720, and the side wall of the outer sleeve portion 720 is provided with a connecting port 730 connecting the ventilation gap with the return port 520. It is understandable that the gas discharged through the ventilation gap still has the possibility of escaping, and the setting of the outer sleeve part 720 can confine the gas to the annular space between the outer sleeve part 720 and the gas pipeline 540. The gas returns to the accommodating space after passing through the ventilation gap, the annular space, and the reflux port 520, further reducing the gas noise and improving the efficiency of gas flow and filtration and deodorization.

[0039] See also Figure 4 and Figure 5In some embodiments of the present invention, the end of the gas duct 540 connected to the inner housing 700 is shaped like a trumpet, gradually narrowing away from the blower 300. The communication port 730 is formed on the lower sidewall of the outer sleeve portion 720 and gradually widens from top to bottom. The radial dimension of the communication port 730 extending parallel to the outer sleeve portion 720 is greater than the diameter of the outer sleeve portion 720. It is understood that when the exhaust end of the blower 300 discharges gas through the trumpet-shaped gas duct 540, it facilitates smooth gas discharge from the gas duct 540, preventing excessive flow velocity from occurring when the cross-sectional area through which the gas passes suddenly decreases, thereby effectively suppressing noise. The gradual expansion of the communication port 730 from top to bottom also facilitates preventing excessive fluid pressure from occurring when the cross-sectional area through which the gas passes suddenly increases, effectively suppressing noise. Furthermore, the radial dimension of the communication port 730 extending parallel to the outer sleeve portion 720 is greater than the diameter of the outer sleeve portion 720, thereby ensuring sufficient gas flow through the return port 520.

[0040] See also Figure 3 and Figure 4 In some embodiments of the present invention, the box body 500 includes a bottom plate 550 and a cover 560 disposed on the bottom plate 550. The inner housing 700 is disposed within the cover 560. The bottom plate 550 is provided with a mounting frame 800 located below the inner housing 700. The partition 530 is formed within the mounting frame 800 to separate a first area connected to the suction end of the fan 300 and a second area connected to the return port 520. The first and second areas are each provided with a plate-shaped filter element 400. The bottom plate 550 is provided with an inlet hole 551 corresponding to the first area, and the bottom plate 550 is provided with an outlet hole 552 corresponding to the second area. It should be noted that the mounting frame 800 only contacts the outer contour of the filter element 400 or contacts the filter element 400 over a small area, thereby avoiding large-scale obstruction of the filter element 400 and affecting the filtering effect. When the switch mechanism 600 closes the exhaust port 510, the fan 300 works, and the gas in the accommodating space enters from the inlet hole 551 to pass through the filter element 400 at the first area, and then passes through the filter element 400 at the second area and returns to the accommodating space, thereby undergoing two filtering and deodorization processes.

[0041] See also Figure 3In some embodiments of the present invention, in order to facilitate the replacement of the filter element 400, two ribs 553 for supporting the inner shell 700 are arranged at intervals on the bottom plate 550, and the side wall of the cover body 560 is provided with a pull-out opening 561 located between the two ribs 553. The mounting frame 800 is slidably embedded between the two ribs 553 to enter and exit from the pull-out opening 561. Limiting protrusions 810 for clamping and fixing the filter element 400 are provided on the inner walls on both sides of the opposite sides of the mounting frame 800. There is a height gap between the limiting protrusion 810 at the lower end and the bottom plate 550. The setting of the height gap prevents the filter element 400 from scratching the bottom plate 550 and damaging the active coating, and is also beneficial to improving the influence of dust accumulation on the inlet hole 551 and the outlet hole 552.

[0042] See also Figure 3 and Figure 4 In this embodiment, a battery is installed on the side of the inner housing 700. A circuit board is placed between the top wall of the inner housing 700 and the housing 560. The battery and the fan 300 are connected to the circuit board. The circuit board is equipped with several operating switches for controlling the activation and air volume of the fan 300. The top wall of the housing 560 is provided with holes that correspond to the operating switches for easy user operation. To ensure that the device can be used without plugging in, the circuit board is also equipped with a charging circuit connected to the battery and a charging port connected to the charging circuit.

[0043] See also Figure 2 and Figure 3 In some embodiments of the present invention, to facilitate switching the exhaust port 510 open and closed, the switch mechanism 600 includes a push plate slidably mounted on the inner sidewall of the housing 500. A waist-shaped hole is defined in the side panel of the housing 500, pointing toward the exhaust port 510. The push plate includes a sliding key that extends from the waist-shaped hole and slides back and forth along the waist-shaped hole. Of course, in other embodiments, the switch mechanism 600 can also be replaced by a plug for opening and closing the exhaust port 510.

[0044] See also Figure 2 and Figure 3In some embodiments of the present invention, a mounting ring 910 is detachably connected to the mounting opening 210. A hook 920 is provided on the side of the mounting ring 910 via an elastic member that can be rotatably engaged with the inner edge of the mounting opening 210. An inwardly protruding annular support plate 930 is formed at the lower end of the inner peripheral edge of the mounting ring 910, and the box body 500 is inserted into the annular support plate 930. In this embodiment, the hook 920 is pivotally mounted on the mounting ring 910. The elastic member is a torsion spring that drives the hook 920 to hook the inner edge of the mounting opening 210. When the user rotates the hook 920, overcoming the elastic force of the torsion spring, the mounting ring 910 and the box body 500 can be detached from the mounting opening 210 together, thereby facilitating replacement of the filter element 400 and facilitating maintenance. Furthermore, when the deodorizing function is not used, the cat litter box can be switched to a semi-enclosed type, thus being used as a semi-enclosed cat litter box.

[0045] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cat litter box, characterized in that: include: A basin body (100), wherein the basin body (100) has a cavity (110) opening upward; A cover body (200) is provided on the basin body (100) and at least partially covers the opening of the cavity (110) to form an accommodating space; A fan (300) is provided on the basin body (100) or the cover body (200), with the air intake end or the air exhaust end of the fan (300) facing the accommodating space; A filter element (400) is located on a gas path driven by the fan (300), the filter element (400) comprising a honeycomb substrate made of polypropylene, the entire surface of the honeycomb substrate being provided with an active coating, the active coating comprising a colloid and a solid catalytic precursor and a solid inducer provided in the colloid; The solid catalytic precursor includes one of ferric sulfate, potassium permanganate, phosphomolybdic acid, silicomolybdic acid, silicotungstic acid and phosphotungstic acid; the solid inducer includes one of sodium carbonate, sodium citrate and urea; and the colloid is nano-alumina colloid or nano-alumina colloidal colloid.

2. A cat litter box according to claim 1, characterized in that: The mass ratio of the honeycomb substrate to the active coating is (5-20):(80-95).

3. A cat litter box according to claim 1, characterized in that: The top of the cover body (200) is provided with an installation opening (210) connected to the accommodating space, and a box body (500) is installed at the installation opening (210). The fan (300) is arranged in the box body (500) with the air intake end facing downward. The side of the box body (500) is provided with an exhaust port (510) connecting the exhaust end of the fan (300) with the outside. The box body (500) is provided with a switch mechanism (600) for opening or closing the exhaust port (510). The box body (500) is provided with a return port (520) connected to the exhaust end of the fan (300) and facing downward. The box body (500) is provided with a partition (530) that separates the return port (520) and the air intake end of the fan (300) so that the gas in the accommodating space can circulate.

4. A cat litter box according to claim 3, characterized in that: The box body (500) is provided with a gas pipe (540) facing the exhaust port (510) at the exhaust end corresponding to the fan (300), and the switch mechanism (600) can be moved to abut against the port of the gas pipe (540), and the port of the gas pipe (540) has a notch (541), and a ventilation gap connected to the return port (520) can be formed between the notch (541) and the switch mechanism (600).

5. A cat litter box according to claim 4, characterized in that: An inner shell (700) is provided in the box body (500), the fan (300) is provided in the inner shell (700), the gas pipeline (540) is formed on the side of the inner shell (700), the bottom wall of the inner shell (700) is provided with an air inlet (710) facing the suction end of the fan (300), the inner shell (700) is provided with an outer sleeve portion (720) located on the outer periphery of the gas pipeline (540), the switch mechanism (600) can simultaneously abut against the port of the gas pipeline (540) and the port of the outer sleeve portion (720), and the side wall of the outer sleeve portion (720) is provided with a connecting port (730) connecting the ventilation gap with the return port (520).

6. A cat litter box according to claim 5, characterized in that: One end of the gas pipe (540) connected to the inner shell (700) is in the shape of a trumpet that gradually shrinks in the direction away from the fan (300), and the connecting port (730) is formed on the lower side wall of the outer sleeve portion (720), and the connecting port (730) gradually expands from top to bottom. The dimension of the connecting port (730) extending along the radial direction parallel to the outer sleeve portion (720) is greater than the diameter dimension of the outer sleeve portion (720).

7. A cat litter box according to claim 5, characterized in that: The box body (500) includes a bottom plate (550) and a cover body (560) arranged on the bottom plate (550), the inner shell (700) is arranged inside the cover body (560), the bottom plate (550) is provided with a mounting frame (800) located below the inner shell (700), the partition (530) is formed inside the mounting frame (800) to separate a first area connected to the suction end of the fan (300) and a second area connected to the return port (520), the first area and the second area are both provided with a plate-shaped filter element (400), the bottom plate (550) is provided with an inlet hole (551) corresponding to the first area, and the bottom plate (550) is provided with an outlet hole (552) corresponding to the second area.

8. A cat litter box according to claim 7, characterized in that: Two ribs (553) for supporting the inner shell (700) are arranged at intervals on the bottom plate (550), and a draw-out opening (561) located between the two ribs (553) is provided on the side wall of the cover body (560). The mounting frame (800) is slidably embedded between the two ribs (553) to enter and exit from the draw-out opening (561). Limiting protrusions (810) for clamping and fixing the filter element (400) are provided on the inner walls on both sides of the opposite sides of the mounting frame (800), and there is a height gap between the limiting protrusion (810) located at the lower end and the bottom plate (550).

9. The cat litter box according to claim 3, characterized in that: The switch mechanism (600) includes a push plate slidably arranged on the inner side wall of the box body (500), the side plate of the box body (500) is provided with a waist-shaped hole pointing to the exhaust port (510), and the push plate is provided with a sliding key extending from the waist-shaped hole to slide back and forth along the waist-shaped hole.

10. The cat litter box according to claim 3, characterized in that: The mounting opening (210) is detachably connected to a mounting ring (910), and a hook member (920) capable of being engaged with the inner edge of the mounting opening (210) is provided on the side of the mounting ring (910) by rotating through an elastic member. An inwardly protruding annular support plate (930) is formed at the lower end of the inner peripheral edge of the mounting ring (910), and the box body (500) is inserted into the annular support plate (930).

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