A sunken drainage structure of an out-opening door
By introducing a water storage frame and a drainage chamber into the sunken drainage structure of the outward-opening door, combined with a water-proof cavity and a water-draining strip, the problem of rainwater backflow during heavy rain is solved, achieving a highly efficient drainage effect and preventing rainwater from entering the room.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN BEILU DOOR & WINDOW CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-29
AI Technical Summary
The existing outward-opening door drainage structure is prone to flooding during heavy rain because the inflow volume exceeds the outflow volume, causing rainwater to fill the profile cavity, reducing the drainage speed, or even backflowing into the room, and failing to effectively prevent rainwater from entering the room.
Design a sunken drainage structure, including a water storage frame and a drainage cavity. The water storage frame expands the water storage capacity and accelerates the flow of rainwater through the height difference. Combined with a water-proof cavity and a water-draining strip, it prevents rainwater from entering the room. Foaming material is used to fill the water-proof cavity to enhance the sealing performance.
It effectively expands water storage capacity, improves drainage speed, prevents rainwater backflow, and ensures that rainwater is discharged outdoors in a timely manner, preventing it from entering the room.
Smart Images

Figure CN224300748U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of swing doors, and in particular to a sunken drainage structure for outward-opening doors. Background Technology
[0002] Outward-opening doors are doors that open to the outside and are quite common in buildings. When open, the door occupies outdoor space but not indoor space, which is advantageous in areas with limited indoor space. Modern outward-opening doors typically achieve a seal by applying sealant to the innermost and outermost parts of the door frame or door leaf, thus keeping rainwater out. Figure 4 As shown, to prevent rainwater from entering the room, current outward-opening doors have through holes on the top surface of the lower frame to guide the incoming rainwater into the profile cavity, and drainage holes are set on the outside of the profile cavity to drain the rainwater. However, this drainage structure mainly relies on the volume inside the profile cavity to collect and temporarily store rainwater. In some areas, there are frequent heavy rains and continuous rainfall. When the inflow of water is greater than the drainage capacity of the through holes, the rainwater can easily fill the profile cavity, reduce the drainage speed, and cause rainwater to backflow into the room. Therefore, the drainage structure of current outward-opening doors needs to be improved. Utility Model Content
[0003] The present invention provides a recessed drainage structure for an outward-opening door to improve drainage capacity and prevent rainwater from entering the room.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a sunken drainage structure for an outward-opening door, comprising a lower frame, the lower frame comprising an indoor profile and an outdoor profile, a water storage frame provided on the outdoor surface of the outdoor profile, a water outlet provided at the bottom of the outdoor surface of the water storage frame, a drainage cavity connected to the water storage frame provided inside the outdoor profile, the bottom surface of the drainage cavity being higher than the bottom surface of the water storage frame, a water inlet provided at the top of the outdoor profile connected to the drainage cavity, and a water-proof cavity provided between the indoor profile and the outdoor profile.
[0005] Furthermore, multiple thermal break adhesives are arranged from top to bottom between the outdoor profile and the indoor profile. The two thermal break adhesives at the top and the indoor and outdoor profiles form a water-proof cavity, which is filled with foaming material.
[0006] Furthermore, a drainage outlet connected to a water storage frame is provided at the bottom of the exterior of the drainage chamber.
[0007] Furthermore, the bottom of the water storage frame is an inclined surface, which gradually slopes downward from the inside to the outside, and the drainage outlet is located at the top of the inclined surface.
[0008] Furthermore, a supporting profile extends from the outdoor surface of the outdoor profile to the water storage frame, and a baffle corresponding to the supporting profile is provided on the outdoor surface of the water storage frame. A water inlet is formed between the supporting profile and the baffle. Drainage strips are detachably provided on the sides of the supporting profile and the baffle that are close to each other, and the two drainage strips abut against each other.
[0009] Furthermore, the top of the outdoor profile is provided with an installation groove, and the sides of the installation groove are formed with retaining edges, and the water inlet is located at the bottom of the installation groove.
[0010] Compared with the prior art, the beneficial effects of this utility model are: by setting a water storage frame at the outdoor end, the water storage capacity is expanded. Both the water storage frame and the drainage chamber can temporarily store rainwater. The rainwater collected by the lower frame flows into the water storage frame through the drainage chamber and is discharged outdoors through the outlet of the water storage frame, preventing rainwater from entering the room. At the same time, the difference in elevation is used to accelerate the flow and discharge of rainwater. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0012] Figure 2 This is a schematic diagram of the lower frame in this utility model.
[0013] Figure 3 This is a perspective view of the outdoor profile and water storage frame in this utility model.
[0014] Figure 4 This is a schematic diagram of the existing lower frame structure.
[0015] In the diagram: 1. Bottom frame; 2. Indoor profile; 3. Outdoor profile; 4. Water storage frame; 5. Thermal break adhesive; 6. Door leaf; 11. Drainage chamber; 12. Waterproof chamber; 40. Water outlet; 41. Supporting profile; 42. Baffle; 44. Drain strip; 100. Water inlet hole; 101. Mounting groove; 111. Drain outlet; 400. Water inlet. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] As shown in the attached figure, the present invention discloses a recessed drainage structure for an outward-opening door, comprising a lower frame 1 and a door leaf. The lower frame 1 includes an indoor profile 2 and an outdoor profile 3, which is a common thermal break profile structure. There is a thermal break adhesive 5 between the indoor profile 2 and the outdoor profile 3. The door leaf is also provided with an outdoor sash profile and an indoor sash profile. There are overlapping adhesives on both sides of the bottom of the door leaf for overlapping with the outdoor surface of the outdoor profile 3 and the indoor surface or top of the indoor profile 2. A water storage frame 4 is provided on the outdoor surface of the outdoor profile 3. A water outlet 40 is provided at the bottom of the outdoor surface of the water storage frame 4. A drainage cavity 11 connected to the water storage frame 4 is provided inside the outdoor profile 3. The bottom surface of the drainage cavity 11 is higher than the bottom surface of the water storage frame 4. A water inlet hole 100 connected to the drainage cavity 11 is provided at the top of the outdoor profile 3. A water-proof cavity 12 is provided between the indoor profile 2 and the outdoor profile 3.
[0018] By setting a water storage frame 4 at the outdoor end, both the water storage frame 4 and the drainage chamber 11 can temporarily store rainwater. Compared with the existing drainage structure, the water storage capacity is expanded, allowing the lower frame 1 to hold more rainwater. The rainwater collected by the lower frame 1 flows into the water storage frame 4 through the drainage chamber 11 and is discharged outdoors through the outlet 40 of the water storage frame 4. Most of the rainwater enters the drainage chamber 11 from the water inlet 100 of the outdoor profile 3, and then flows from the drainage chamber 11 to the water outlet. A small amount of rainwater enters the position of the thermal break 5. Due to the water-proof cavity 12 set between the indoor profile 2 and the outdoor profile 3, the rainwater cannot enter. It enters the water-proof cavity 12 through the gap between the thermal break 5 and the indoor profile 2 / outdoor profile 3, and then flows into the drainage chamber 11. An opening can also be made in the thermal break 5 at the top. At the same time, the water-proof cavity 12 is higher than the drainage chamber 11. The difference in height is used to accelerate the flow and discharge of rainwater and prevent rainwater from entering the room.
[0019] Specifically, multiple thermal break adhesives 5 are arranged from top to bottom between the outdoor profile 3 and the indoor profile 2. The two thermal break adhesives 5 at the top, together with the indoor profile 2 and the outdoor profile 3, form a water-proof cavity 12. The water-proof cavity 12 is filled with foaming material, which can be directly selected as expanding foam. The water-proof cavity at the thermal break structure prevents rainwater from entering through the connection gap between the indoor profile 2 / outdoor profile 3 and the thermal break adhesives 5. Figure 1 and 2 In conjunction with the sloping surface design of the top of the indoor profile 2, it is more conducive to guiding rainwater into the installation groove 101.
[0020] Specifically, the bottom of the exterior of the drainage chamber 11 is provided with a drain outlet 111 connected to the water storage frame 4. The bottom of the water storage frame 4 is an inclined surface, which gradually slopes downward from the inside to the outside. The drain outlet 111 is located at the top of the inclined surface and is used for drainage.
[0021] Specifically, the outdoor profile 3 extends a supporting profile 41 to the water storage frame 4 on its outdoor surface. The water storage frame 4 has a baffle 42 corresponding to the supporting profile 41 on its outdoor surface. An inlet 400 is formed between the supporting profile 41 and the baffle, allowing rainwater to directly enter the water storage frame 4. By first diverting the water, the amount of rainwater remaining on the top of the water storage frame 4 is reduced. At the same time, the inlet 400 is located above the outlet 40, so the water will be discharged immediately after entering the inlet 400. Both the supporting profile 41 and the baffle can be detachably equipped with a drainage strip 44 on their adjacent sides. The two drainage strips 44 abut against each other and have multiple slits. The drainage strips 44 can be used to filter out impurities and prevent larger impurity particles from entering the water storage tank. The drainage strips 44 can be existing weatherstripping.
[0022] Specifically, the top of the outdoor profile 3 is provided with an installation groove 101, and the two sides of the installation groove 101 are formed with retaining edges. The water inlet hole 100 is located at the bottom of the installation groove 101. The installation groove 101 is an existing structure. Existing installation grooves 101 are set on the top of the indoor profile 2 and also on the top of the outdoor profile 3. They are mainly used for installing hinges. It should be noted that the water inlet hole 100 is installed at the bottom of the installation groove 101. The groove walls on both sides of the installation groove 101 block part of the rainwater, so that the rainwater can first enter the drainage chamber 11 directly through the water inlet hole 100.
[0023] The above embodiments are preferred embodiments of this utility model. All structures similar to this utility model and equivalent changes thereof should fall within the protection scope of this utility model.
Claims
1. A recessed drainage structure for an outward-opening door, comprising a lower frame, the lower frame including indoor profiles and outdoor profiles, characterized in that: The outdoor profile has a water storage frame on its outdoor surface, and a water outlet is provided at the bottom of the outdoor surface of the water storage frame. The outdoor profile has a drainage cavity connected to the water storage frame, and the bottom surface of the drainage cavity is higher than the bottom surface of the water storage frame. The top of the outdoor profile has a water inlet connected to the drainage cavity. A water-proof cavity is provided between the indoor profile and the outdoor profile.
2. The sunken drainage structure with an outward-opening door according to claim 1, characterized in that: Multiple thermal break adhesives are arranged from top to bottom between the outdoor profile and the indoor profile. The two thermal break adhesives at the top and the indoor and outdoor profiles form a water-proof cavity, which is filled with foaming material.
3. The sunken drainage structure with an outward-opening door according to claim 1, characterized in that: The bottom of the exterior of the drainage chamber is provided with a drainage outlet that connects to the water storage frame.
4. The sunken drainage structure with an outward-opening door according to claim 3, characterized in that: The bottom of the water storage frame is an inclined surface, which gradually slopes downward from the inside to the outside, and the drainage outlet is located at the top of the inclined surface.
5. The sunken drainage structure with an outward-opening door according to claim 1, characterized in that: The outdoor profile extends from the outdoor surface of the water storage frame to form a supporting profile. The outdoor surface of the water storage frame is provided with a baffle corresponding to the supporting profile. A water inlet is formed between the supporting profile and the baffle. Both the supporting profile and the baffle are detachably provided with a drainage strip on their sides that are close to each other, and the two drainage strips abut against each other.
6. The sunken drainage structure with an outward-opening door according to claim 1, characterized in that: The top of the outdoor profile is provided with an installation groove, and the two sides of the installation groove are formed with retaining edges. The water inlet is located at the bottom of the installation groove.