drain core

Abstract

The invention provides a floor drain core and belongs to the technical field of floor drains. It solves the problem of realizing double-odor prevention and ensuring drainage capacity while having a complex structure. It comprises a lower-end closed cylindrical outer sleeve arranged in the vertical direction and an inner sleeve arranged in the vertical direction and provided with a drain hole in the outer sleeve. The inner sleeve and the outer sleeve form a water passing cavity, and the side of the outer sleeve is provided with a water outlet hole connected with the water passing cavity. The cross section of the outer sleeve and the cross section of the inner sleeve are both rectangular. The number of water outlet holes is two, and they are respectively located on the side of the two long sides of the cross section of the outer sleeve. The outer side of the two water outlet holes is respectively hinged with a flap that can be flipped to embed in the water outlet hole around the hinge point. The outer port of the water outlet hole has an outwardly expanding flared mouth-shaped matching surface, and the edge of the flap has an abutting surface that can abut against the matching surface when the flap is flipped downward around the hinge point. It has the advantages of good odor prevention effect, simple structure, large drainage capacity, etc.

Description

Technical Field

[0001] This invention belongs to the field of floor drain technology and relates to floor drain cores. Background Technology

[0002] Floor drains are crucial interfaces connecting drainage pipe systems to indoor floors. They are essential components of residential drainage systems, with their primary function being drainage. However, due to evolving living needs, modern floor drains also incorporate backflow prevention and odor control functions. Currently, various types of floor drains are available on the market, such as water-sealed, mechanical-sealed, and magnetic types, with water-sealed floor drains being the most widely used. Existing water-sealed floor drains generally consist of a drain body and a drain core. The drain core includes a cylindrical outer sleeve and an inner sleeve. The upper end of the outer sleeve rests against the inner bottom wall of the drain body and extends downwards. The inner sleeve is located inside the outer sleeve, forming a water passage cavity between them. A water outlet hole is provided through the side of the outer sleeve extending outside the drain body. During drainage, water remains in the water passage cavity below the water outlet hole, forming a water seal and preventing bedbugs or odors from the sewer pipes from entering the room.

[0003] However, water-sealed floor drains have a significant drawback: when the room is not drained for an extended period, the water remaining in the passage chamber to form the water seal will dry out (especially common in dry areas). This causes the water seal to fail, allowing bed bugs or unpleasant odors to enter the room. To address this issue, Chinese patent application number 201621274157.4 proposes a gravity-type mechanical seal double-cylinder water-sealed hybrid seal floor drain. This drain adds a gravity-type mechanical device above the water seal structure, creating a dual odor-proof function. However, this type of drain has a more complex structure and is more expensive. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a drain core that solves the problem of complex structure while achieving dual odor prevention and ensuring drainage volume.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A drain core includes an outer sleeve with a closed cylindrical shape at the lower end, arranged vertically, and an inner sleeve inside the outer sleeve with a drain hole arranged vertically. A water passage cavity is formed between the inner sleeve and the outer sleeve, and a drain hole communicating with the water passage cavity is provided on the side of the outer sleeve. The outer sleeve and the inner sleeve are both rectangular in cross-section. There are two drain holes, which are located on the sides of the two long sides of the outer sleeve cross-section. The outer sides of the outer sleeve where the two drain holes are located are respectively hinged with flaps that can be flipped around the hinge point and embedded in the drain holes. The outer port of the drain hole has a mating surface that expands outward into a funnel shape. The edge of the flap has a mating surface that can abut against the mating surface when the flap is flipped downward around the hinge point.

[0007] In its natural state, the abutting surfaces of the two flaps abut against their corresponding mating surfaces, sealing the water outlet. During drainage, water flows through the inner sleeve into the water passage cavity, and when it reaches the water outlet, the water pressure pushes the flaps open (the flaps flip upwards around the hinge point), allowing water to drain. After drainage, some water remains in the water passage cavity below the water outlet, forming a water seal. Simultaneously, after the water pressure is lost, the two flaps flip downwards under their own weight, locking into the outer port of the water outlet, and the abutting surfaces of the flap edges abut against the mating surfaces, resealing the corresponding water outlet. With the above design, when the water in the passage cavity below the outlet dries up (i.e., the water seal fails), the flap's abutting surface presses against the mating surface, eliminating gaps between the flap and the outer casing and sealing the outlet. This also helps prevent bedbugs or odors from entering the room, thus achieving a dual odor-proof function. Furthermore, this is achieved simply by changing the shape of the outer casing and the flap's design, significantly simplifying the overall structure while improving odor prevention. Additionally, the flap also prevents backflow when backflow occurs in the drain pipe.

[0008] In addition, since the drain pipes are all round, the local drain core has rectangular cross-sections for both the outer and inner sleeves. This not only allows the side of the outer sleeve to be hinged with a flap for use, but also ensures sufficient drainage. The guaranteed drainage is achieved through a combination of the following factors: 1. The outer sleeve has a rectangular cross-section, and the flap is hinged to the outer wall where the long side of the outer sleeve's cross-section is located. This allows for a larger outlet hole and a larger flap rotation angle, ensuring sufficient drainage volume and speed at the outlet hole; 2. With a rectangular outer sleeve cross-section, the rectangular inner sleeve cross-section ensures sufficient flow through the drain hole.

[0009] In the aforementioned drain core, the outer side of the flap has an inwardly recessed portion that gradually curves inward from the top and bottom of the flap towards the middle.

[0010] The aforementioned concave design ensures that the thickness of the lower part of the flap gradually increases from top to bottom. This structure is highly beneficial for the flap to swing downwards around the hinge point under its own weight after drainage, guaranteeing the reliability of the dual odor-proof function of the local leak-proof core. Simultaneously, the concave design ensures that the flap is positioned maximally within the outer port of the outlet, reducing the area where backflow water acts on the flap and preventing it from being lifted by backflow water, further improving the backflow prevention effect.

[0011] In the aforementioned drain core, the outer sleeve containing the water outlet has a hinge seat, the upper side of the flap has a sheet-like protrusion and the upper side of the sheet-like protrusion is integrally fixed with a hinge shaft set in the hinge seat, the outer sleeve containing the water outlet also has a groove and the groove is connected to the water outlet, when the flap is flipped downward around the hinge point, the sheet-like protrusion can be embedded in the groove.

[0012] The hinge shaft and hinge seat work together to form a hinged relationship between the flap and the outer casing. This allows the water outlet to open around the hinge point under water pressure during drainage, or to re-close the outlet under its own weight after drainage. The groove design allows the flap to make way for the sheet-like protrusions when it flips downwards (i.e., the sheet-like protrusions embed into the groove), ensuring a close fit between the flap's abutting surface and the corresponding mating surface. This enhances the sealing effect on the outlet, further improving the odor prevention effect when the water seal fails.

[0013] In the aforementioned drain core, the hinge seat includes two seats at the same height, with a groove between the two seats. Both seats are provided with notches, which penetrate the upper side of the seat and the side opposite to the two seats. The bottom wall of the notch and one side wall of each notch are provided with a limiting recess. The two ends of the hinge shaft pass through the corresponding notch from top to bottom and are engaged in the corresponding limiting recess.

[0014] During assembly, the two ends of the hinge shaft are passed from top to bottom through the notch grooves of the corresponding seats and inserted into the corresponding limiting recesses, so that the two ends of the hinge shaft are well positioned in the two seats to ensure that the flip plate can be reliably flipped.

[0015] In the aforementioned drain core, the outer casing is made of plastic and both seats are integrally molded onto the outer casing.

[0016] The outer casing is made of plastic and both seats are integrally molded onto the outer casing, which means that the two seats have a certain degree of elasticity. Therefore, the two ends of the hinge shaft can be directly squeezed into the limiting notch by human force, and then the two ends of the hinge shaft are positioned in the limiting notch by the contraction of the seat itself.

[0017] In the aforementioned drain core, the outer wall of the outer casing where the water outlet is located has an inclined surface, which is located below the water outlet. The distance from the inclined surface to the axis of the outer casing gradually decreases from top to bottom.

[0018] An inclined surface is provided on the outer wall of the outer jacket where the water outlet is located. The distance from the inclined surface to the axis of the outer jacket gradually decreases from top to bottom. This shape is more conducive to drainage.

[0019] In the aforementioned drain core, the water outlet is square, and the shape of the flap matches the water outlet.

[0020] The water outlet is located on the side wall where the long side of the outer casing cross-section is located. Setting the water outlet to be square can further increase the drainage volume while achieving dual odor prevention function.

[0021] In the aforementioned drain core, the upper opening of the drain hole is funnel-shaped.

[0022] The above settings create a siphon effect when water flows downwards from the upper opening of the drain hole, thus increasing the drainage speed.

[0023] In the aforementioned drain core, the outer edge of the upper end of the outer sleeve has a shoulder and a positioning step is provided on the inner side of the shoulder. The inner sleeve is inserted into the outer sleeve and the outer edge of the upper end of the inner sleeve has a protruding edge that abuts against the positioning step.

[0024] In use, the outer sleeve passes through the lower port of the drain body, with its shoulder abutting against the inner bottom wall of the drain body. Then, the filter plate (included with the drain) is inserted into the drain body, and the upper edge of the inner sleeve is pressed against the positioning step of the outer sleeve, thus fixing the inner sleeve and outer sleeve together. This design allows the inner sleeve and outer sleeve to be detachable, enabling users to remove the inner sleeve for cleaning.

[0025] Compared with existing technologies, local leakage cores have the following advantages:

[0026] 1. By hinged to the outside of the outer sleeve where the water outlet is located, the flap will flip under its own weight and seal the water outlet. Thus, even if the water seal fails, it can still prevent bed bugs or odors from entering the room to a certain extent, ensuring the dual odor prevention function. It can also prevent backflow when there is backflow in the drain pipe.

[0027] 2. Double odor prevention is achieved simply by changing the shape of the outer cover and the setting of the flap. Therefore, while improving the odor prevention effect, the overall structure is greatly simplified, the process is simpler, and the drainage volume is guaranteed. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a local leaky core (in its natural state).

[0029] Figure 2 This is a cross-sectional view of the local leaky core (in its natural state).

[0030] Figure 3 This is an exploded diagram showing the relationship between the outer and inner sleeves in a local leakage core.

[0031] Figure 4 This is a schematic diagram of the flap in the local leak core.

[0032] Figure 5 This is a side view of the flap in the local leak core.

[0033] Figure 6 This is a schematic diagram of a local leaking core (in use).

[0034] Figure 7 This is a cross-sectional view of the local leaking core (in use).

[0035] In the diagram, 1. Outer sleeve; 1a. Water outlet; 1a1. Mating surface; 1b. Shoulder; 1b1. Positioning step; 1c. Vertical section; 1d. Inclined surface; 1e. Hinge seat; 1e1. Seat body; 1e11. Notch groove; 1e12. Limiting notch; 1f. Groove; 2. Inner sleeve; 2a. Drain hole; 2b. Protruding edge; 3. Water passage cavity; 4. Flip plate; 4a. Abutting surface; 4b. Sheet-like protrusion; 4c. Concave part; 5. Hinge shaft. Detailed Implementation

[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, the drain core includes an outer sleeve 1 with a closed cylindrical shape at the lower end, arranged vertically, and an inner sleeve 2 located inside the outer sleeve 1 and having a drain hole 2a arranged vertically. The lower end face of the inner sleeve 2 is higher than the inner bottom wall of the outer sleeve 1, and a water passage cavity 3 is formed between the inner sleeve 2 and the outer sleeve 1. The side of the outer sleeve 1 is provided with a drain hole 1a that communicates with the water passage cavity 3. The cross-section of both the outer sleeve 1 and the inner sleeve 2 is rectangular, that is, both the outer sleeve 1 and the inner sleeve 2 are cuboid. The upper edge of the outer sleeve 1 has a shoulder 1b, and the inner side of the shoulder 1b is provided with a positioning step 1b1. The inner sleeve 2 is inserted into the outer sleeve 1. The outer edge of the upper end of the inner sleeve 2 has a protruding edge 2b, which abuts against the positioning step 1b1, and the upper side of the protruding edge 2b of the inner sleeve 2 is flush with the upper side of the shoulder 1b. The drain core is mainly used in floor drains. The floor drain also includes the drain body and a filter plate installed inside the drain body. During installation, first fix the drain body, pass the outer sleeve 1 through the lower port of the drain body and let the shoulder 1b abut against the inner bottom wall of the drain body. Then insert the inner sleeve 2 into the outer sleeve 1 so that the outer edge 2b of its upper end abuts against the positioning step 1b1 of the outer sleeve 1. Finally, put the filter plate into the drain body and firmly press the shoulder 2b against the positioning step 1b1. The upper opening of the drain hole 2a is funnel-shaped. This shape allows water to flow downward from the upper opening of the drain hole 2a, creating a siphon effect and improving the drainage speed.

[0038] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, there are two water outlets 1a, located on the sides of the two long sides of the cross-section of the outer jacket 1. The outer sides of the outer jacket 1 containing the two water outlets 1a are each hinged with a flap 4 that can flip downwards around the hinge point and embed into the water outlet 1a. The outer port of the water outlet 1a has an outwardly flared mating surface 1a1. The edge of the flap 4 has a contact surface 4a that abuts against the mating surface 1a1 when the flap 4 flips downwards around the hinge point. The water outlet 1a is square, and the shape of the flap 4 matches the shape of the water outlet 1a. In its natural state, as... Figure 1 and Figure 2 As shown, the abutting surfaces 4a of the two flaps 4 abut against the corresponding mating surfaces 1a1, thus sealing the water outlet 1a. During drainage, as... Figure 6 and Figure 7 As shown, water flows through the inner sleeve 2 into the water passage cavity 3, and when it overflows to the outlet hole 1a, the water pressure pushes open the flap 4 (the flap 4 flips upward around the hinge point) to achieve drainage. After drainage, some water remains in the water passage cavity 3 below the outlet hole 1a, forming a water seal. At the same time, after the water pressure is lost, the two flaps 4 will flip downward by their own gravity, and the flaps 4 will be inserted into the outer port of the outlet hole 1a. The abutting surface 4a of the edge of the flap 4 abuts against the mating surface 1a1, thus resealing the corresponding outlet hole 1a.

[0039] When the water in the water passage cavity 3 below the outlet hole 1a dries up, indicating that the water seal has failed, the abutting surface 4a of the flap 4 abuts against the mating surface 1a1, ensuring no gap between the flap 4 and the outer casing 1, thus sealing the outlet hole 1a. This also helps prevent bed bugs or odors from entering the room to some extent, achieving a dual odor-proof function. Furthermore, this is achieved simply by changing the shape of the outer casing 1 and the setting of the flap 4, thus greatly simplifying the overall structure while improving the odor-proof effect. In addition, the flap 4 also helps prevent backflow when backflow occurs in the drain pipe.

[0040] In addition, since the drain pipes are all round, the cross-sections of both the outer sleeve 1 and the inner sleeve 2 of the local drain core are rectangular. This not only allows the side of the outer sleeve 1 to be hinged to the flap 4 for use, but also ensures the drainage volume. The guaranteed drainage volume is mainly due to the combination of the following aspects: 1. The outer sleeve 1 has a rectangular cross-section, and the flap 4 is hinged to the outer wall where the long side of the outer sleeve 1's cross-section is located. This allows for a larger outlet hole 1a and a larger rotation angle of the flap 4, ensuring the drainage volume and speed at the outlet hole 1a; 2. With the outer sleeve 1 having a rectangular cross-section, the inner sleeve 2's rectangular cross-section ensures sufficient flow through the drain hole.

[0041] Furthermore, such as Figure 5As shown, the outer surface of the flap 4 has an arc-shaped concave portion 4c that gradually indents from the top and bottom towards the center. The concave portion 4c ensures that the thickness of the lower part of the flap 4 gradually increases from top to bottom. This structure is highly beneficial for the flap 4 to swing downwards around the hinge point under its own weight after drainage, ensuring the reliability of the dual odor-proof function of the local leak core. Simultaneously, the concave portion 4c ensures that the flap 4 is maximally located within the outer port of the outlet hole 1a, reducing the impact point of backflow water on the flap 4 and preventing it from being lifted by backflow water, further improving the backflow prevention effect. Figure 2 As shown, the outer wall of the outer jacket 1 where the water outlet 1a is located has an inclined surface 1d, which is located below the water outlet 1a. The distance from the inclined surface 1d to the axis of the outer jacket 1 gradually decreases from top to bottom. The distance between the inclined surface 1d and the inner wall of the outer jacket 1 where the water outlet 1a is located also gradually decreases from top to bottom. This shape is more conducive to drainage.

[0042] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the outer sleeve 1 containing the water outlet 1a has a hinge seat 1e on its side. The upper side of the flap 4 has a sheet-like protrusion 4b, and a hinge shaft 5 integrally fixed to the upper side of the sheet-like protrusion 4b is provided in the hinge seat 1e. The outer sleeve 1 containing the water outlet 1a also has a groove 1f, and the groove 1f is connected to the water outlet 1a. When the flap 4 is flipped downward around the hinge point, the sheet-like protrusion 4b can be embedded in the groove 1f. The groove 1f allows the sheet-like protrusion 4b to make way when the flap 4 is flipped downward (i.e., the sheet-like protrusion is embedded in the groove), so that the abutting surface 4a of the flap 4 and the corresponding mating surface 1a1 can fit together as closely as possible to improve the sealing effect on the water outlet 1a, thereby further improving the odor prevention effect of the flap 4 when the water seal fails. The hinge seat 1e includes two seat bodies 1e1 located at the same height. The outer sleeve 1 is made of plastic and both seat bodies 1e1 are integrally formed on the outer sleeve 1. The groove 1f is located between the two seat bodies 1e1. Both seat bodies 1e1 are provided with notches 1e11. The notches 1e11 penetrate the upper side of the seat body 1e1 and the side opposite to the two seat bodies 1e1. The bottom wall of the notches 1e11 and one side wall of the notches 1e11 are provided with limiting recesses 1e12. The two ends of the hinge shaft 5 pass through the corresponding notches 1e11 from top to bottom and are engaged in the corresponding limiting recesses 1e12.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A drain core, comprising an outer sleeve (1) with a closed cylindrical shape at its lower end arranged vertically, and an inner sleeve (2) disposed inside the outer sleeve (1) and having a drain hole (2a) arranged vertically, wherein a water passage cavity (3) is formed between the inner sleeve (2) and the outer sleeve (1), and a drain hole (1a) communicating with the water passage cavity (3) is provided on the side of the outer sleeve (1), and the drain hole (1a) is higher than the lower end of the inner sleeve (2), characterized in that, The cross-sections of the outer sleeve (1) and the inner sleeve (2) are both rectangular. There are two water outlets (1a), which are located on the sides of the two long sides of the cross-section of the outer sleeve (1). The outer sides of the outer sleeve (1) where the two water outlets (1a) are located are respectively hinged with flaps (4) that can be flipped downward around the hinge point and embedded in the water outlets (1a). The outer port of the water outlet (1a) has a mating surface (1a1) that expands outward into a funnel shape. The edge of the flap (4) has a contact surface (4a) that can abut against the mating surface (1a1) when the flap (4) is flipped downward around the hinge point. The outer side of the plate (4) has an indentation (4c) that gradually recesses from the top and bottom of the flip plate (4) toward the middle position in an arc shape. The side of the outer sleeve (1) where the water outlet (1a) is located has a hinge seat (1e). The upper side of the flip plate (4) has a sheet-like protrusion (4b) and the upper side of the sheet-like protrusion (4b) is integrally fixed with a hinge shaft (5) set in the hinge seat (1e). The side of the outer sleeve where the water outlet (1a) is located is also provided with a groove (1f) and the groove (1f) is connected to the water outlet (1a). When the flip plate (4) flips down around the hinge point, the sheet-like protrusion (4b) can be embedded in the groove (1f).

2. The drain core according to claim 1, characterized in that, The hinge seat (1e) includes two seats (1e1) at the same height. The groove (1f) is located between the two seats (1e1). Both seats (1e1) are provided with notches (1e11). The notches (1e11) penetrate the upper side of the seat (1e1) and the side opposite to the two seats (1e1). The bottom wall of the notches (1e11) and one side wall of the notches (1e11) are provided with limiting recesses (1e12). The two ends of the hinge shaft (5) pass through the corresponding notches (1e11) from top to bottom and are inserted into the corresponding limiting recesses (1e12).

3. The drain core according to claim 2, characterized in that, The outer cover (1) is made of plastic and both seats (1e1) are integrally formed on the outer cover (1).

4. The drain core according to claim 1, 2, or 3, characterized in that, The outer wall of the outer jacket (1) where the water outlet (1a) is located has an inclined surface (1d). The inclined surface (1d) is located below the water outlet (1a), and the distance from the inclined surface (1d) to the axis of the outer jacket (1) gradually decreases from top to bottom.

5. The drain core according to claim 4, characterized in that, The water outlet (1a) is square, and the shape of the flap (4) matches that of the water outlet (1a).

6. The drain core according to claim 1, characterized in that, The upper opening of the drain hole (2a) is flared.

7. The drain core according to claim 6, characterized in that, The outer sleeve (1) has a shoulder (1b) on the outer edge of the upper end and a positioning step (1b1) is provided on the inner side of the shoulder (1b). The inner sleeve (2) is inserted into the outer sleeve (1) and the outer edge of the upper end of the inner sleeve (2) has a protruding edge (2b) that abuts against the positioning step (1b1).

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