Cat litter basin

Abstract

The invention 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 invention relates to the technical field of pet products, in particular to a cat litter box. Background Art

[0002] With the development of social economy, more and more people start to keep pets. Cats and dogs are among the more popular pets. For example, cats have the habit of burying their excrement, so cat owners usually equip them with a litter box, which is a container for cats to use. After cats excrete feces or urine, the excrement combines with cat litter to form lumps, and the excrement will release ammonia for a long time. Ammonia has the characteristics of low olfactory threshold and obvious odor, which can lead to the occurrence of odor pollution. The odor gas will stimulate the human olfactory organ, causing discomfort to people and polluting the living environment.

[0003] At present, there are several common practices: the first is to use activated carbon materials to absorb some of the pollutants, but the adsorption effect of activated carbon is relatively general. When the adsorption reaches the saturation value, it is easy to desorb and cause secondary pollution; the second is to use an ozone generator to generate ozone, and use the strong oxidizing property of ozone to achieve sterilization and disinfection, but when the ozone generator is working, it must be carried out in an unmanned space, otherwise it may cause harm to the human body, and in serious cases, it may cause poisoning; the third is to use plasma or negative ions to achieve sterilization and disinfection. The above methods are not effective in purifying ammonia produced by pet excrement. Summary of the invention

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

[0005] A cat litter box according to an embodiment of the present invention comprises: a basin body, the basin body having a cavity opening upward; a cover body, arranged on the basin body, at least partially covering the opening of the cavity to form a containing space; a fan, arranged on the basin body or the cover body, the air intake end or the air exhaust end of the fan facing the containing space; a filter element, located on the gas path driven by the fan, the filter element 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 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 nano-alumina colloid or nano-oxide 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 a gas path driven by a fan. When the fan drives the gas in the accommodating space to pass through the above-mentioned filter element, the high oxidizing property and strong electronegativity of the catalytically 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 opening connected to the accommodating space is provided on the top of the cover body, a box body is installed at the mounting opening, the fan is arranged in the box body with the air intake end facing downward, an exhaust port connecting the exhaust end of the fan with the outside is provided on the side of the box body, a switch mechanism for opening or closing the exhaust port is provided on the box body, 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 pipeline 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 pipeline. The port of the gas pipeline 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 directly opposite to 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 switch 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, one 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 along the radial extension 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 rib plates for supporting the inner shell are spaced apart on the bottom plate, a pull-out opening located between the two rib plates is provided on the side wall of the cover body, the mounting frame is slidably embedded between the two rib plates for entering and exiting from the pull-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 a height gap is provided between the limiting protrusion located 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 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 member capable of being engaged with the inner edge of the mounting port is rotatably provided on the side of the mounting ring through an elastic member, and an inwardly protruding annular support plate is formed at the lower end of the inner peripheral edge of the mounting ring, 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 in part will be obvious from the following description, or will be 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 A schematic structural 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 1 A schematic diagram of the structure of the embodiment after removing the basin body and the cover body;

[0022] Figure 4 for Figure 1 An internal cross-sectional schematic diagram of an embodiment with the basin body, cover body, hood body, and mounting ring removed;

[0023] Figure 5 It is a structural schematic 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; installation opening 210; fan 300; filter element 400; box body 500; exhaust port 510; return port 520; partition 530; gas pipeline 540; notch portion 541; bottom plate 550; inlet hole 551; outlet hole 552; rib plate 553; cover body 560; pull-out opening 561; switch mechanism 600; inner shell body 700; air inlet 710; outer sleeve portion 720; connecting port 730; installation frame 800; limiting convex plate 810; installation ring 910; hook member 920; annular support plate 930. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood 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 and 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, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See also Figures 1 to 6 A cat litter box of the present invention comprises: a basin body 100, wherein the basin body 100 has a cavity 110 opening upward; a cover body 200, which is arranged on the basin body 100 and at least partially covers the opening of the cavity 110 to form a storage space; a fan 300, which is arranged on the basin body 100 or the cover body 200, and the air intake end or the exhaust end of the fan 300 faces the storage space; a filter element 400, which is located on the gas path driven by the fan 300, and the filter element 400 comprises a honeycomb substrate made of polypropylene, and the entire surface of the honeycomb substrate is provided with an active coating, and the active coating comprises 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 a nano-alumina colloid or a nano-alumina colloid.

[0032] The cat litter box of the above structure has a honeycomb substrate made of polypropylene coated with an active coating disposed 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 mixed evenly by grinding 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 sufficiently to make it react completely 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 can be understood that too little active coating will reduce the removal efficiency of odor pollutants, and too much active coating will cause the active component particles on the surface of the material to overlap and aggregate and grow, which will also reduce the removal efficiency of odor pollutants; after testing, when the mass ratio of the honeycomb substrate to the active coating satisfies the above relationship, a good deodorizing effect can be obtained.

[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. Under the drive of the fan 300, the gas in the accommodation space is sucked up to pass through the filter element 400 and then directly discharged from the exhaust port 510. Under normal circumstances, the gas can be completely discharged from the exhaust port 510 without passing through the reflux 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. Under the drive of the fan 300, the gas in the accommodation space is sucked up to pass through the filter element 400. Since the exhaust port 510 is in a closed state, the gas will return to the accommodation space through the reflux port 520, thereby forming a clockwise circulation in the up and down directions. Through the above structure, the gas can be discharged or circulated internally on the basis of removing the odor molecules in the gas, which is suitable for different usage scenarios, simple in structure, and easy to use.

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

[0037] See also Figure 2 , Figure 3 and Figure 4In some embodiments of the present invention, the box body 500 is provided with a gas pipeline 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 pipeline 540, and the port of the gas pipeline 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. It can be understood that if only the exhaust port 510 is blocked, when the gas after passing through the filter element 400 passes through the exhaust port 510, turbulence will be formed, and the gas is prone to run around and generate a large noise. When the switch mechanism 600 moves to abut against the port of the gas pipeline 540, the gas can be drained from the ventilation gap to the return port 520, and return to the accommodation space after passing through the return port 520, thereby reducing the gas turbulence phenomenon and reducing the 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, the bottom wall of the inner shell 700 is provided with an air inlet 710 directly opposite to 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. It is understandable that the gas discharged through the ventilation gap still has the possibility of escaping, and the setting of the outer sleeve portion 720 can confine the gas to the annular space between the outer sleeve portion 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 filtering and deodorization.

[0039] See also Figure 4 and Figure 5In some embodiments of the present invention, the end of the gas pipe 540 connected to the inner shell 700 is in a trumpet shape that gradually shrinks in the direction away from the fan 300, the communication port 730 is formed on the lower side wall of the outer sleeve part 720, and the communication port 730 gradually expands from top to bottom, and the dimension of the communication port 730 extending in the radial direction parallel to the outer sleeve part 720 is greater than the diameter of the outer sleeve part 720. It can be understood that when the exhaust end of the fan 300 discharges the gas through the trumpet-shaped gas pipe 540, it is beneficial to guide the gas to be discharged smoothly from the gas pipe 540, avoid the situation that the flow rate is too high when the cross-sectional area of ​​the gas suddenly decreases, and effectively suppress noise; and the communication port 730 gradually expands from top to bottom, which is beneficial to avoid the situation that the fluid pressure is too high when the cross-sectional area of ​​the gas suddenly increases, effectively suppressing noise, and the dimension of the communication port 730 extending in the radial direction parallel to the outer sleeve part 720 is greater than the diameter of the outer sleeve part 720, which can ensure the 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 body 560 disposed on the bottom plate 550, the inner shell 700 is disposed 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. 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 in a small area, so as to avoid blocking the filter element 400 in a large area and affecting the filtering effect. When the switch mechanism 600 closes the exhaust port 510, the fan 300 starts working, 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 going through two filtering and deodorizing 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 convex plates 810 for clamping and fixing the filter element 400 are arranged on the inner walls on both sides of the opposite sides of the mounting frame 800. There is a height gap between the limiting convex plate 810 located 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 also provided on the side of the inner housing 700, a circuit board is placed between the top wall of the inner housing 700 and the cover 560, the battery and the fan 300 are respectively connected to the circuit board, a number of operating switches for controlling the start of the fan 300 and the air volume of the fan 300 are provided on the circuit board, and a hole corresponding to each operating switch is provided on the top wall of the cover 560 for user operation. In order to use without plugging in, the circuit board is also equipped with a charging circuit connected to the battery and a charging interface connected to the charging circuit.

[0043] See also Figure 2 and Figure 3 In some embodiments of the present invention, in order to conveniently switch the opening and closing of the exhaust port 510, 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. 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, the mounting opening 210 is detachably connected with a mounting ring 910, and the side of the mounting ring 910 is provided with a hook member 920 that can be snapped to the inner edge of the mounting opening 210 through the rotation of an elastic member, and the lower end of the inner peripheral edge of the mounting ring 910 is formed with an annular support plate 930 that protrudes inward, and the box body 500 is inserted on the annular support plate 930. In this embodiment, the hook member 920 is pivotally arranged on the mounting ring 910, and the elastic member is a torsion spring that drives the hook member 920 to hook the inner edge of the mounting opening 210. When the user overcomes the elastic force of the torsion spring and rotates the hook member 920, the mounting ring 910 and the box body 500 can be separated from the mounting opening 210 together, so as to facilitate the replacement of the filter element 400 and maintenance. It can also switch the cat litter box to a semi-enclosed type without using the deodorization function, and can be used as a semi-enclosed cat litter box.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit 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 receiving cavity (110) opening upward; A cover body (200) is disposed on the basin body (100) and at least partially covers the opening of the cavity (110) to form a receiving space; A fan (300) is disposed on the basin body (100) or the cover body (200), and an air intake end or an air exhaust end of the fan (300) faces 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 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 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) which is 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 downwards. The side of the box body (500) is provided with an exhaust port (510) which connects the exhaust end of the fan (300) with the outside. The box body (500) is provided with a switch mechanism (600) which opens or closes the exhaust port (510). The box body (500) is provided with a return port (520) which is connected to the exhaust end of the fan (300) and faces downwards. The box body (500) is provided with a partition (530) which 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 pipeline (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 pipeline (540), and the port of the gas pipeline (540) has a notch portion (541), and a ventilation gap connected to the return port (520) can be formed between the notch portion (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) directly opposite to 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) for 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 pipeline (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, and 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) comprises a bottom plate (550) and a cover body (560) arranged on the bottom plate (550); the inner shell body (700) is arranged inside the cover body (560); the bottom plate (550) is provided with a mounting frame (800) located below the inner shell body (700); the partition plate (530) is formed inside the mounting frame (800) to separate a first area connected to the air intake 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); an inlet hole (551) is provided on the bottom plate (550) corresponding to the first area; and an outlet hole (552) is provided on the bottom plate (550) 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 pull-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) so as to enter and exit from the pull-out opening (561). Limiting protrusions (810) for clamping and fixing the filter element (400) are arranged on the inner walls on both sides of the opposite sides of the mounting frame (800), and a height gap is provided between the limiting protrusion (810) located at the lower end and the bottom plate (550).

9. A cat litter box according to claim 3, characterized in that: The switch mechanism (600) comprises 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. A cat litter box according to claim 3, characterized in that: The mounting opening (210) is detachably connected to a mounting ring (910); a hook member (920) capable of being snapped onto the inner edge of the mounting opening (210) is rotatably provided on the side of the mounting ring (910) 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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