Floor drain core and floor drain

Abstract

The floor drain core comprises a floor drain core body and a sealing cover, a water inlet is formed in the upper end of the floor drain core body, a water outlet is formed in the lower end of the floor drain core body, and the sealing cover is rotationally connected to the lower end of the floor drain core body so as to open or close the water outlet; the side wall of the floor drain core body comprises an inner-layer wall body and an outer-layer wall body arranged outside the inner-layer wall body, a water passing gap is formed between the inner peripheral surface of the outer-layer wall body and the outer peripheral surface of the inner-layer wall body, the upper end of the water passing gap is communicated with the water inlet, and when the sealing cover is in a closed state, the lower end of the water passing gap is sealed by the sealing cover, so that the water passing gap forms a first water storage cavity. The hidden first water storage cavity is formed through the water passing gap, the water storage height is guaranteed, the drying speed of water in the first water storage cavity can be slowed down, impurities entering the first water storage cavity can be reduced, and therefore the water storage performance is guaranteed, and the timeliness of water film sealing is improved.

Description

Technical Field

[0001] The invention relates to the field of sanitary ware, in particular to a floor drain core and a floor drain. Background Art

[0002] The floor drain core is the core component of the floor drain, which plays a role in preventing odor and insects. The traditional floor drain core is usually provided with a sealing cover that can be turned up and down at the lower end of the floor drain core body to control the opening or closing of the drain outlet of the floor drain core. Specifically, when the floor drain core is filled with water, the sealing cover is flipped downward by the impact of the water flow to open the drain outlet. When the floor drain core stops taking in water, or the impact force of the water flow is not enough to drive the sealing cover, the sealing cover flips upward to close the drain outlet. However, after the floor drain core is used for a period of time, its sealing cover is easily unable to be tightly closed to the initial closed position due to factors such as stains or aging, resulting in a significant reduction in the anti-odor and anti-insect effects. In order to solve this problem, a new type of floor drain core has appeared in the prior art, which is a circle of annular silicone concave grooves at the bottom end of the floor drain core body, and the upper end of the concave groove directly opens to store water. When the sealing cover is closed, the concave groove and the sealing cover form a water film cavity, and the lower end of the concave groove discharges water to the water film cavity to form a water film, and the cooperation of the concave groove and the sealing cover forms multiple seals. However, this new type of floor drain core has the following shortcomings: the silicone concave groove does not have sufficient water storage height, the water storage capacity is limited, and it is completely open, resulting in direct contact between the upper end of the water storage surface and the air, a large contact area, easy to dry (usually dry out and become ineffective after 1 hour), and low water film timeliness; while the silicone concave groove adopts an open water inlet, various impurities in the water can easily enter the annular groove, which is difficult to remove, and can easily clog the water outlet at the lower end of the groove, and can also easily stretch the annular silicone, causing the annular silicone to deform, and ultimately causing the water film to fail and be unable to store water. Summary of the invention

[0003] The present invention mainly aims at the technical problem of low timeliness of water film in the floor drain core of the prior art, and provides a floor drain core and a floor drain, which can achieve the water film sealing function through structural improvement and greatly improve the timeliness of water film sealing.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a floor drain core, including a floor drain core body and a sealing cover, the upper end of the floor drain core body is provided with a water inlet, and the lower end is provided with a drain outlet, the sealing cover is rotatably connected to the lower end of the floor drain core body to open or close the drain outlet; the side wall of the floor drain core body includes an inner wall body and an outer wall body arranged outside the inner wall body, a water gap is formed between the inner circumferential surface of the outer wall body and the outer circumferential surface of the inner wall body, the upper end of the water gap is connected to the water inlet, and when the sealing cover is closed, the lower end of the water gap is closed by the sealing cover, so that the water gap forms a first water storage chamber.

[0005] Furthermore, the upper surface of the sealing cover is provided with a circle of water storage tanks extending along its circumference. When the sealing cover is closed, the lower end of the outer wall body and / or the lower end of the inner wall body cooperate with the water storage tank to form a water film seal.

[0006] Furthermore, when the sealing cover is in a closed state, the lower end of the outer wall body and / or the lower end of the inner wall body respectively touches the bottom surface of the water storage tank.

[0007] Furthermore, when the sealing cover is in the closed state, the water storage tank is divided into a second water storage chamber and a third water storage chamber by the side wall of the floor drain core body, the first water storage chamber is located on the inner side of the lower end of the inner wall body, the third water storage chamber is located on the outer side of the lower end of the outer wall body, and the first water storage chamber is located between the second water storage chamber and the third water storage chamber.

[0008] Furthermore, a plurality of ribs are spaced apart between the outer wall and the inner wall, so as to partition and / or divert the water gap.

[0009] Furthermore, the plurality of ribs are arranged on one of the inner wall body and the outer wall body and abut against the other of the inner wall body and the outer wall body, or, a part of the plurality of ribs are arranged on the inner wall body, and the rest are arranged on the outer wall body, and the ribs arranged on the inner wall body abut against the outer wall body, and the ribs arranged on the outer wall body abut against the inner wall body, or the ribs arranged on the inner wall body abut against and cooperate with the ribs arranged on the outer wall body.

[0010] Furthermore, the multiple ribs are distributed at intervals along the circumference of the floor drain core body, and each rib extends in the up and down directions respectively, the upper end edge of each rib is lower than the upper end edge of the water gap respectively, and the lower end edge of each rib is higher than the lower end edge of the water gap respectively; the spacing between adjacent ribs is greater than or equal to 4 mm and less than or equal to 15 mm.

[0011] Furthermore, the height of the inner wall is greater than or equal to half the height of the floor drain core body; the height of the water gap is greater than or equal to 15 mm and less than or equal to 25 mm, and the width of the water gap is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0012] Furthermore, the inner side of the outer wall body is provided with a step surface located above the inner wall body, and a water inlet gap is formed between the step surface and the upper end of the inner wall body, and the water inlet gap is connected to the water flow gap.

[0013] Furthermore, a filtering structure is provided in the water inlet gap, and the filtering structure includes a plurality of water inlet notches provided at the upper end of the inner wall body and distributed circumferentially thereof, and adjacent water inlet notches are separated by a convex portion provided at the upper end of the inner wall body, and the convex portion contacts the step surface.

[0014] Furthermore, the floor drain core body includes a floor drain core body and an inner liner, the inner liner is sleeved in the floor drain core body, the inner wall is formed on the inner liner, and the outer wall and the water inlet are formed on the floor drain core body.

[0015] Furthermore, a buckle is provided at the upper end of the lining, and a slot is provided at the floor drain core body corresponding to the buckle, and the buckle is snapped into the slot.

[0016] Furthermore, the sealing cover includes a cover plate and a rubber pad, the cover plate is rotatably connected to the floor drain core body, the rubber pad is arranged on the cover plate, and the water storage tank is provided.

[0017] Furthermore, the sealing cover also includes a pressure cover, which is fixedly connected to the cover plate and presses the rubber pad onto the cover plate; the pressure cover has a top surface that is high in the middle and low around edges.

[0018] The present invention further provides a floor drain, comprising a floor drain seat and a floor drain core as described in the present invention, wherein the floor drain core is removably disposed in the floor drain seat.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Since the side wall of the floor drain core body of the present invention includes an inner wall body and an outer wall body, a water gap is formed between the outer wall body and the inner wall body. When the sealing cover is closed, the lower end of the water gap is sealed by the sealing cover, so that the water gap forms a first water storage cavity. When the sealing cover is closed, the present invention can use the first water storage cavity to achieve water film sealing, thereby forming multiple seals and solving the problem of reduced sealing effect of the sealing cover due to stains or aging. In particular, the present invention uses the water gap between the inner wall body and the outer wall body to form a relatively hidden first water storage cavity, which not only ensures the water storage height, but also slows down the drying speed of the water in the first water storage cavity, and can reduce the entry of impurities into the first water storage cavity, thereby ensuring the water storage performance and further improving the timeliness of the water film sealing.

[0021] 2. The upper surface of the sealing cover is provided with a circle of water storage tanks extending along its circumference. When the sealing cover is closed, the lower end of the outer wall body and / or the lower end of the inner wall body cooperate with the water storage tank to form a water film seal, so that the present invention can also utilize the water storage tank to achieve a water film sealing function, thereby achieving multiple water film sealing functions and further improving the sealing effect.

[0022] 3. The present invention further arranges the plurality of ribs in the water gap, which can partition and divert the water gap, slow down the falling speed of the water flow, and further ensure the water storage performance.

[0023] 4. The inner side of the outer wall is provided with a step surface located above the inner wall, and a water inlet gap connected to the water-passing gap is formed between the step surface and the upper end of the inner wall, so that the water inlet gap can roughly achieve horizontal water inflow, thereby playing a filtering role and further reducing the dirt from entering the water-passing gap through the water inlet gap. In particular, a filtering structure is further provided in the water inlet gap, which can further reduce the possibility of impurities entering the water-passing gap.

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the floor drain core and the floor drain of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an exploded schematic diagram of the floor drain core of the present invention;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the first liner of the present invention;

[0027] Figure 3 It is a top view of the inner liner and the floor drain core body of the present invention in a combined state;

[0028] Figure 4 is a cross-sectional schematic diagram of the inner liner and the floor drain core body of the present invention in a combined state;

[0029] Figure 5 is a closed schematic diagram (cross-sectional view) of the sealing cover of the present invention;

[0030] Figure 6 It is a schematic diagram of water storage of the sealing cover of the present invention;

[0031] Figure 7 is a cross-sectional view of the floor drain core of the present invention when the sealing cover is closed;

[0032] Figure 8 yes Figure 7 A magnified schematic diagram of part A;

[0033] Fig. 9 yes Figure 7 A partial enlarged schematic diagram of

[0034] Fig.10 is a schematic diagram of the three-dimensional structure of the second liner of the present invention;

[0035] Fig.11 is a schematic diagram of the three-dimensional structure of the third liner of the present invention;

[0036] Fig.12is a cross-sectional view of a floor drain of the present invention;

[0037] In the figure, 10, floor drain core body; 1, floor drain core body; 11, water inlet; 12, water outlet; 13, slot; 14, step surface; 2, lining; 21, rib; 22, buckle; 23, water inlet gap; 24, convex part; 20, sealing cover; 3, cover plate; 31, receiving groove; 4, rubber pad; 41, water storage tank; 5, counterweight; 6, pressure cover; 7, water gap; 71, first water storage chamber; 72, water inlet gap; 8, second water storage chamber; 9, third water storage chamber; 30, floor drain seat; 40, floor drain cover; 50, filter screen. DETAILED DESCRIPTION

[0038] In the present invention, the terms "first", "second", "third", etc. are only used to distinguish similar objects, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. In the description, the orientations or positional relationships indicated by "upper", "lower", "inner", "outer", "top / bottom", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0040] See also Figure 1-Figure 9 As shown, a floor drain core of the present invention comprises a floor drain core body 10 and a sealing cover 20. The upper end of the floor drain core body 10 is provided with a water inlet 11, and the lower end is provided with a drain outlet 12. The sealing cover 20 is rotatably connected to the lower end of the floor drain core body 10 to open or close the drain outlet 12. Specifically, when water enters the water inlet 11, the sealing cover 20 is impacted by the water flow and flips downward to open the drain outlet 12. When the water inlet 11 stops entering the water, or the impact force of the water flow is insufficient to drive the sealing cover 20, the sealing cover 20 is flipped upward by the reset member to close the drain outlet 12. In this embodiment, the reset member is specifically a counterweight block 5 arranged on the sealing cover 20, but it is not limited thereto. In other embodiments, the reset member is an elastic member and / or a magnetic component arranged between the sealing cover 20 and the floor drain core body 10.

[0041] The side wall of the floor drain core body 10 includes an inner wall body and an outer wall body disposed outside the inner wall body. The height of the inner wall body is greater than or equal to half the height of the floor drain core body 10. The lower end of the inner wall body forms a drain port 12, and the upper end of the outer wall body forms a water inlet 11. A water gap 7 closed on all sides is formed between the inner circumference of the outer wall body and the outer circumference of the inner wall body. The upper end of the water gap 7 is connected to the water inlet 11. When the sealing cover 20 is closed, the lower end of the water gap 7 is closed by the sealing cover 20, so that the water gap 7 forms a first water storage chamber 71. The height of the water gap 7 is greater than or equal to 15 mm and less than or equal to 25 mm. In this embodiment, the height of the water gap 7 is about 20 mm as an example, but it is not limited to this. Therefore, when the sealing cover 20 is closed, the present invention can use the first water storage chamber 71 to achieve water film sealing, thereby forming multiple seals, solving the problem of reduced sealing effect of the sealing cover 20 due to stains or aging. In particular, the first water storage chamber 71 is formed by the water gap 7, which not only ensures the water storage height but also is relatively concealed, can slow down the drying speed of the water in the first water storage chamber 71, and can reduce the entry of impurities into the first water storage chamber 71, thereby ensuring the water storage performance and further improving the timeliness of the water film seal.

[0042] As a preferred embodiment, the upper surface of the sealing cover 20 is provided with a circle of water storage tanks 41 extending along its circumference. When the sealing cover 20 is closed, the lower end of the outer wall body and / or the lower end of the inner wall body cooperate with the water storage tank 41 to form a water film seal. Specifically, the lower end of the outer wall body and / or the lower end of the inner wall body respectively touch the bottom surface of the water storage tank 41, but is not limited to this. Therefore, the present invention can also use the water storage tank 41 to achieve a water film sealing function, thereby achieving multiple water film sealing functions and further improving the sealing effect. Specifically, when the sealing cover 20 is closed, the water storage tank 41 is divided into a second water storage chamber 8 and a third water storage chamber 9 by the side wall of the floor drain core body 10, the first water storage chamber 71 is located on the inner side of the lower end of the inner wall body, the third water storage chamber 9 is located on the outer side of the lower end of the outer wall body, and the first water storage chamber 71 is located between the second water storage chamber 8 and the third water storage chamber 9. When a gap appears between the sealing cover 20 and the bottom end of the side wall of the floor drain core body 10 due to aging or dirt in the closed state, the first water storage chamber 71 and the second water storage chamber 8 and / or the third water storage chamber 9 can be connected to each other for water replenishment.

[0043] In this embodiment, the floor drain core body 10 includes a floor drain core body 1 and an inner lining 2 which are connected from top to bottom. The inner lining 2 is made of materials such as ABS, POM or PE. The inner lining 2 is mounted in the floor drain core body 1. The inner wall is formed on the inner lining 2, and the outer wall and the water inlet 11 are formed on the floor drain core body 1. The inner lining 2 is connected to the floor drain core body 1 by snapping to limit the inner lining 2. Specifically, the upper end of the inner lining 2 is provided with a plurality of snaps 22 which protrude outward and are higher than the upper edge of the inner lining 2. The floor drain core body 1 is provided with a slot 13 corresponding to each snap 22, and the snap 22 is snapped into the slot 13.

[0044] There are multiple ribs 21 spaced apart between the outer wall and the inner wall, which can partition and / or divert the water gap 7, increase the viscosity of water, and slow down the falling speed of the water flow. Multiple ribs 21 are arranged on one of the inner wall and the outer wall, and abut against the other of the inner wall and the outer wall, or, among the multiple ribs 21, a part is arranged on the inner wall, and the rest is arranged on the outer wall, and the ribs arranged on the inner wall abut against the outer wall, and the ribs arranged on the outer wall abut against the inner wall, or the ribs arranged on the inner wall abut against the ribs arranged on the outer wall. Specifically, in the present embodiment, multiple ribs 21 are arranged on the outer side of the lining 2, and are interference fit with the inner side of the floor drain core body 1, so that the lining 2 can be positioned so that the lining 2 can be more stably fitted in the floor drain core body 1.

[0045] like Figure 2 , Figure 4 As shown, multiple ribs 21 are evenly distributed along the circumference of the water gap 7, and each rib 21 extends in the up-down direction, and the upper edge of each rib 21 is lower than the upper edge of the water gap 7, and the lower edge of each rib 21 is higher than the lower edge of the water gap 7. In this way, water can flow evenly into the upper end of the water gap 7, and when the water in a certain partition is blocked or dry at the lower end, water can be replenished with water from other partitions without being blocked by the ribs 21, ensuring that there is water around the lower end of the water gap 7. Figure 4As shown, the width L of the water gap 7 (i.e., the distance between the inner circumference of the outer wall and the outer circumference of the inner wall) is greater than or equal to 0.7 mm and less than or equal to 1.5 mm; the distance H between adjacent ribs 21 is greater than or equal to 4 mm and less than or equal to 15 mm. After testing, when L and H are slightly larger: L is greater than 0.7 mm and less than 1.5 mm, and H is greater than 4 mm and less than 15 mm, that is, when the partition area is larger, after the sealing cover 20 is opened, the water in the first water storage chamber 71 will directly flow down and be quickly emptied. If the water inlet 11 above is constantly replenished with water, the water in the water storage chamber will be constantly updated and replenished. When L and H are relatively small, L is less than 0.7mm, and H is less than 4mm, that is, when the partition area is relatively small, after the sealing cover 20 is opened, the water in the first water storage chamber 71 will be suspended instead of dripping directly, and it will take 2-3 seconds for a few drops to drip and then stop dripping. Therefore, in this case, the water in the first water storage chamber 71 dries slowly, but is easily clogged with stains, and the water in the first water storage chamber 71 is slowly updated. Considering that the drainage is sewage, and there are stains and scale problems in the water that will adhere to the first water storage chamber 71, a solution with slightly larger L and H is adopted. When stains and scale adhere to the first water storage chamber 71, it is equivalent to a solution with smaller L and H. In other embodiments, each rib 21 is arranged roughly horizontally, and can be a long rib 21, and is staggered up and down, such as Fig.10 As shown, each rib 21 may also be a short rib 21, and is generally distributed in a plurality of rows and columns, such as Fig.11 shown.

[0046] In this embodiment, a water inlet gap 72 connected to the water gap 7 is formed between the upper end of the inner wall body and the outer wall body. Specifically, the inner side of the outer wall body is provided with a step surface 14 located above the inner wall body. The step surface 14 can be a horizontal surface or an inclined surface. This embodiment takes a horizontal surface as an example, and the protrusion of the step surface 14 is smaller than the distance between the inner circumference of the inner wall body and the inner circumference of the outer wall body. A water inlet gap 72 is formed between the step surface 14 and the upper end of the inner wall body. In this way, the present invention can further hide the upper end of the first water storage cavity 71 by using the step surface 14, thereby further slowing down the drying speed of the water flow, and the formed water inlet gap 72 can roughly achieve lateral water inlet, which can play a certain filtering role, thereby further reducing the dirt from entering the water gap 7 through the water inlet gap 72.

[0047] Furthermore, a filtering structure is provided in the water inlet gap 72, which can further reduce the possibility of dirt entering the water gap 7. Specifically, the filtering structure includes a plurality of water inlet notches 23 provided at the upper end of the inner wall (i.e., the inner liner 2) and distributed along the circumference thereof, and adjacent water inlet notches 23 are separated by convex portions 24 provided at the upper end of the inner wall, and the convex portions 24 contact the step surface 14, which can further position the inner liner 2.

[0048] In the present embodiment, the sealing cover 20 includes a cover plate 3 and a rubber pad 4. One end of the cover plate 3 is rotatably connected to the lower end of the floor drain core body 1. The rubber pad 4 is preferably made of silicone, but is not limited thereto. The rubber pad 4 is arranged on the cover plate 3 and is provided with a water storage tank 41. Specifically, the sealing cover 20 also includes a pressure cover 6, which is fixedly connected to the middle part of the cover plate 3 by ultrasonic or other means, and presses the rubber pad 4 onto the cover plate 3. The pressure cover 6 has a top surface with a high middle and low edges around, which has a diversion effect and is conducive to the collection of residual water into the water storage tank 41 of the rubber pad 4. The above-mentioned reset member (i.e., the counterweight block 5) is installed in the corresponding receiving groove on the cover plate 3, and the configuration block and the rubber pad 4 are located on both sides of the rotation axis of the cover plate 3.

[0049] In a floor drain core of the present invention, when water enters the water inlet 11, most of the water flows quickly down along the inner lining 2 and impacts the sealing cover 20 to open the drain port 12, and then is discharged to the sewer through the drain port 12. In this process, the water entering the water gap 7 is also discharged from the lower end of the water gap 7. As the amount of water entering the water inlet 11 gradually decreases, the water flow rate decreases, and the impact force of the water flow is insufficient to keep the sealing cover 20 open, the sealing cover 20 is gradually turned upward by the reset member (i.e., the counterweight block 5, but not limited thereto) until the drain port 12 is closed. Figure 5 As shown, during this process, the water storage tank 41 on the sealing cover 20 will gradually accumulate residual water. When the sealing cover 20 is closed to a horizontal state, the residual water will flow along both sides of the circumference of the water storage tank 41, as shown in FIG. Figure 6 After the sealing cover 20 closes the drain port 12, the residual water will flow downward along the inner wall of the floor drain core body 1, and penetrate inward when passing through the step surface 14, thereby entering the first water storage chamber 71 through the water inlet gap 72, as shown in FIG. Figure 7 , Figure 8 As shown, the arrow indicates the direction of water flow. In this way, when the sealing cover 20 is closed, the water stored in the first water storage chamber 71 forms a first water film seal at the sealing cover 20, and the accumulated water in the water storage tank 41 is diverted to the second water storage chamber 8 and the third water storage chamber 9, respectively forming a second water film and a third water film. The water volume sealed by the triple water film will complement each other when the sealing cover 20 is closed. When the sealing cover 20 cannot be completely closed due to aging, impurities and other factors, and there is a gap, the water in the first water storage chamber 71 flows down and fills the gap with the viscosity of water, so that odor and insects cannot pass through.

[0050] Therefore, the present invention can use the first water storage chamber 71 and the water storage channel 41 (the water storage channel 41 is not a necessary solution) to achieve water film sealing when the sealing cover 20 is closed, thereby forming multiple seals to solve the problem of reduced sealing effect of the sealing cover 20 due to stains or aging. In particular, the present invention uses the water gap 7 between the inner wall and the outer wall to form a relatively hidden first water storage chamber 71, which not only ensures the water storage height, but also slows down the drying speed of the water in the first water storage chamber 71, and reduces the entry of impurities into the first water storage chamber 71, thereby ensuring the water storage performance, and further improving the timeliness of the first water film seal.

[0051] See also Figure 1-Figure 12 As shown, the present invention further provides a floor drain, including a floor drain seat 30 and a floor drain core as described above, wherein the floor drain core is removably disposed in the floor drain seat 30 .

[0052] The present invention further comprises a floor drain cover 40 and a filter 50. The floor drain cover 40 is detachably disposed in the top of the floor drain seat 30. The filter 50 is disposed in the floor drain seat 30 and is located between the floor drain cover 40 and the floor drain core.

[0053] Regarding the structure and working principle of the floor drain core, please refer to the previous description, which will not be repeated here.

[0054] The present invention relates to a floor drain core and a floor drain, and the unrelated parts are the same as those in the prior art or can be implemented by using the prior art.

[0055] The above embodiments are only used to further illustrate a floor drain core and a floor drain of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A floor drain core, comprising a floor drain core body and a sealing cover, wherein the upper end of the floor drain core body is provided with a water inlet, the lower end is provided with a drain outlet, and the sealing cover is rotatably connected to the lower end of the floor drain core body to open or close the drain outlet; characterized in that: The side wall of the floor drain core body includes an inner wall body and an outer wall body arranged outside the inner wall body, and a water gap is formed between the inner circumferential surface of the outer wall body and the outer circumferential surface of the inner wall body. The upper end of the water gap is connected to the water inlet. When the sealing cover is closed, the lower end of the water gap is closed by the sealing cover, so that the water gap forms a first water storage chamber.

2. The floor drain core according to claim 1, characterized in that: The upper surface of the sealing cover is provided with a circle of water storage tanks extending along its circumference. When the sealing cover is closed, the lower end of the outer wall body and / or the lower end of the inner wall body cooperates with the water storage tank to form a water film seal.

3. The floor drain according to claim 2, characterized in that: When the sealing cover is in a closed state, the lower end of the outer wall and / or the lower end of the inner wall respectively touches the bottom surface of the water storage tank.

4. The floor drain core according to claim 2, characterized in that: When the sealing cover is closed, the water storage tank is divided into a second water storage chamber and a third water storage chamber by the side wall of the floor drain core body. The first water storage chamber is located on the inner side of the lower end of the inner wall body, and the third water storage chamber is located on the outer side of the lower end of the outer wall body. The first water storage chamber is located between the second water storage chamber and the third water storage chamber.

5. The floor drain core according to claim 1, characterized in that: A plurality of ribs are spaced apart between the outer wall and the inner wall, and the water gap can be partitioned and / or diverted.

6. The floor drain core according to claim 5, characterized in that: The multiple ribs are arranged on one of the inner wall body and the outer wall body, and press against the other of the inner wall body and the outer wall body, or, among the multiple ribs, a part is arranged on the inner wall body, and the rest is arranged on the outer wall body, and the ribs arranged on the inner wall body press against the outer wall body, and the ribs arranged on the outer wall body press against the inner wall body, or, the ribs arranged on the inner wall body press against the ribs arranged on the outer wall body.

7. The floor drain core according to claim 5, characterized in that: The multiple ribs are distributed at intervals along the circumference of the floor drain core body, and each rib extends in the up and down directions respectively, the upper end edge of each rib is lower than the upper end edge of the water flow gap respectively, and the lower end edge of each rib is higher than the lower end edge of the water flow gap respectively; the spacing between adjacent ribs is greater than or equal to 4mm and less than or equal to 15mm.

8. The floor drain core according to claim 1, characterized in that: The height of the inner wall is greater than or equal to half the height of the floor drain core body; the height of the water gap is greater than or equal to 15 mm and less than or equal to 25 mm, and the width of the water gap is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

9. The floor drain core according to claim 1, characterized in that: The inner side of the outer wall body is provided with a step surface located above the inner wall body, and a water inlet gap is formed between the step surface and the upper end of the inner wall body, and the water inlet gap is connected to the water flow gap.

10. The floor drain core according to claim 9, characterized in that: A filtering structure is provided in the water inlet gap, and the filtering structure includes a plurality of water inlet notches provided at the upper end of the inner wall and distributed along its circumference, and adjacent water inlet notches are separated by a convex portion provided at the upper end of the inner wall, and the convex portion contacts the step surface.

11. The floor drain core according to any one of claims 1 to 10, characterized in that: The floor drain core body comprises a floor drain core body and an inner liner, wherein the inner liner is sleeved in the floor drain core body, the inner wall body is formed on the inner liner, and the outer wall body and the water inlet are formed on the floor drain core body.

12. The floor drain core according to claim 11, characterized in that: A buckle is provided at the upper end of the lining, and a slot is provided in the floor drain core body corresponding to the buckle, and the buckle is snapped into the slot.

13. The floor drain core according to any one of claims 2 to 4, characterized in that: The sealing cover comprises a cover plate and a rubber pad, the cover plate is rotatably connected to the floor drain core body, the rubber pad is arranged on the cover plate, and the water storage tank is provided.

14. The floor drain core according to claim 12, characterized in that: The sealing cover also includes a pressure cover, which is fixedly connected to the middle of the cover plate and presses the rubber pad tightly onto the cover plate; the pressure cover has a top surface that is high in the middle and low around the edges.

15. A floor drain, comprising a floor drain seat, characterized in that: It also includes a floor drain core as described in any one of claims 1 to 14, and the floor drain core is removably arranged in the floor drain seat.

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