A preheating negative pressure ventilation switching device for winter closed heating room

Abstract

The utility model relates to the field of indoor ventilation, put forward a kind of preheating type negative pressure ventilation switching device of winter airtight heating room, including outer tube, hollow inner tube is sleeved in outer tube, air flow passage is formed between inner tube and outer tube, it is fixedly connected between inner tube and outer tube by support frame, the air outlet of inner tube is vertically downward and penetrates the bottom wall of outer tube;The air inlet one end of inner tube is connected with air inlet component;The device uses " inner and outer sleeve pipe type " structure, and air inlet and exhaust are integrated in a double-layer sleeve pipe, indoor oil fume waste gas is discharged from indoor to outdoor through the air flow passage between inner tube and outer tube, and outdoor air is then introduced into indoor through inner tube, and simultaneously, the heat carried by oil fume waste gas itself and the special structure of inner and outer sleeve pipe are utilized to preheat the outdoor air introduced in a non-contact manner, so that the indoor temperature is prevented from being reduced by the introduction of outdoor air.

Description

Technical Field

[0001] This utility model relates to the field of indoor ventilation, and in particular to a preheating negative pressure ventilation adapter for a sealed heated room in winter. Background Technology

[0002] Range hoods use fans to expel cooking fumes from the room during cooking to maintain clean and healthy indoor air. When the range hood fan is on, a strong negative pressure quickly forms indoors. Since windows are usually closed in winter, this creates a relatively enclosed space. The negative pressure forces outside air to be drawn in through gaps in doors, windows, and drains, resulting in unpleasant odors and significant suction noise near windows, affecting the comfort of the indoor environment. The most direct solution to address the pressure difference between indoors and outdoors is to open windows for ventilation. However, opening windows in winter causes a sharp drop in indoor temperature, leading to heat loss and decreased comfort. Furthermore, kitchen windows are usually located on the side above the stove; opening them can affect the stability of the flame, impacting cooking efficiency and creating safety hazards. Installing a fresh air system is also an option, but it is expensive and requires complex ductwork. Therefore, a low-cost, easy-to-install device that can effectively balance indoor and outdoor pressure is needed. Utility Model Content

[0003] In order to overcome the problem of negative pressure in a closed heating room in winter caused by the operation of the range hood fan in the existing technology, this utility model provides a preheating negative pressure ventilation adapter for a closed heating room in winter, including an outer pipe, a hollow inner pipe sleeved inside the outer pipe, an air flow channel formed between the inner pipe and the outer pipe, the inner pipe and the outer pipe are fixedly connected by a support frame, the air outlet of the inner pipe is vertically downward and penetrates the bottom wall of the outer pipe, and an air inlet component is connected to one end of the air inlet of the inner pipe; The air intake assembly includes an elbow, one end of which is vertically downward and penetrates the bottom wall of the outer pipe. The other end of the elbow is fitted with a cover plate that can be rotated to cut off the air passage between the elbow and the inner pipe when the cover plate is lowered.

[0004] Preferably, the end of the elbow with the cover plate is tapered inward, and a connecting seat is fixed to the top of the elbow, with the connecting seat rotatably connected to the cover plate.

[0005] Preferably, the outer tube extends horizontally through the wall, the air inlet of the outer tube is connected to the air outlet of the fan through a flexible hose, and the air outlet of the outer tube is located outside the wall.

[0006] Preferably, a rain cap is snapped into the outer end of the outer tube extending out of the wall. The rain cap includes a retaining edge that can be fitted into the outer tube. An arc-shaped rain cap is provided on the upper part of the retaining edge, and a filter screen is installed inside the rain cap.

[0007] Preferably, a dustproof screen is installed inside the air inlet of the inner tube located outdoors.

[0008] Preferably, the cover plate is a cover plate made of lightweight metal composite material.

[0009] Preferably, the connection between the inner tube and the outer tube is sealed by adhesive bonding.

[0010] Preferably, the connection between the inner tube and the elbow is sealed by adhesive.

[0011] Preferably, the outer tube is 500 mm to 700 mm long and 60 mm to 180 mm in diameter.

[0012] Preferably, the inner tube is 300 mm to 500 mm long and 30 mm to 90 mm in diameter.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This device adopts an "inner and outer sleeve" structure, integrating air intake and exhaust into a single double-layer sleeve. By utilizing the pressure difference between indoors and outdoors, the opening and closing state of the cover is automatically adjusted, thereby opening or cutting off the passage for outside air to enter the room; at the same time, by utilizing the heat carried by the oil fume exhaust gas itself and the special structure of the inner and outer jacket pipes, the incoming outdoor air is preheated in a non-contact manner, preventing the introduced outdoor air from lowering the indoor temperature and affecting the comfort of living; the device has an integrated structure, requiring no additional power equipment and control system, and is simple to manufacture and install at a low cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model in use; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 for Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This is a structural diagram of a rain hat.

[0015] The meanings of the labels in the attached diagram are as follows: 1. Outer pipe; 2. Inner pipe; 3. Dustproof net; 4. Wall; 5. Rainproof cap; 501. Filter screen; 502. Clip edge; 6. Support frame; 7. Air inlet assembly; 701. Connecting seat; 702. Cover plate; 703. Elbow. 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 scope of protection of the present utility model.

[0017] Please see Figures 1 to 4 The present invention provides a preheating negative pressure ventilation adapter for a sealed heating room in winter, comprising an outer pipe 1, a hollow inner pipe 2 sleeved inside the outer pipe 1, forming an airflow channel between the inner pipe 2 and the outer pipe 1, the inner pipe 2 and the outer pipe 1 being fixedly connected by a support frame 6, the air outlet of the inner pipe 2 being vertically downward and penetrating the bottom wall of the outer pipe 1, and an air inlet assembly 7 being connected to one end of the air inlet of the inner pipe 2; the air inlet assembly 7 includes an elbow 703, one end of the elbow 703 being vertically downward and penetrating the bottom wall of the outer pipe 1; a cover plate 702 is rotatably covered at the other end of the elbow 703, and when the cover plate 702 falls, it can cut off the airflow channel between the elbow 703 and the inner pipe 2.

[0018] It should be noted that the outer pipe 1 and the inner pipe 2 form a double-layer sleeve structure. The outer pipe 1 is used to exhaust the hot oily fumes from the room to the outside. At the same time, the residual heat of the oily fumes can be used to preheat the cold air flowing from the outside to the inside in the inner pipe 2 in a non-contact manner, reducing the impact of the outdoor airflow on the indoor temperature. The cover plate 702, which is rotatably connected at the elbow 703, will push open the cover plate 702 when the range hood fan is started and the indoor pressure gradually forms. This opens the airflow channel in the inner pipe 2, allowing outdoor air to continuously enter the room through the inner pipe 2, thus balancing the indoor and outdoor air pressure difference. This is beneficial for the exhaust of the range hood and avoids the problem of sewer odor caused by indoor negative pressure. When the indoor and outdoor pressures are in equilibrium, the cover plate 702 will fall naturally under its own weight, blocking the air outlet of the elbow 703 and cutting off the channel for outdoor air to enter the room. The indoor temperature will not decrease due to the continuous entry of outdoor air.

[0019] This device adopts an "inner and outer sleeve" structure to achieve preheating air exchange. It integrates air intake and exhaust functions into a double-layer sleeve, making it a one-piece structure that requires no additional power equipment or control system. It is simple to manufacture and install and has low cost.

[0020] See appendix Figures 2 to 3 As shown, the elbow 703 has a cover plate 702 at one end that tapers inward, and a connecting seat 701 is fixed to the top of the elbow 703. The connecting seat 701 is rotatably connected to the cover plate 702. The taper elbow 703 suppresses the diffusion of airflow, which is conducive to forming a tight air jet and increases the air intake rate in the inner tube 2.

[0021] See appendix Figure 1 Appendix Figure 4 As shown, the outer pipe 1 runs horizontally through the wall 4. The air inlet of the outer pipe 1 is connected to the air outlet of the range hood fan through a flexible hose. The air outlet of the outer pipe 1 is located outside the wall 4. A rain cap 5 is fastened inside the outer end of the outer pipe 1 extending out of the wall 4. The rain cap 5 includes a retaining edge 502, which can be fitted inside the outer pipe 1. An arc-shaped rain cap is provided on the upper part of the retaining edge 502. A filter screen 501 is installed inside the rain cap.

[0022] Specifically, the outer pipe 1 is embedded in the wall, and the gaps through the wall must be filled with fireproof material. The insulation layer should be intact and undamaged to avoid condensation seeping into the wall due to temperature differences, which could lead to dampness and mold. One end of the outer pipe 1 is connected to the air outlet of the range hood fan through a flexible hose. When the range hood fan is working, the air is sent outdoors through the outer pipe 1. The clip 502 of the rain cap 5 is connected to the outer pipe 1. A filter screen 501 is installed inside the rain cap to prevent rainwater and debris from entering the outer pipe 1 and affecting the normal exhaust of the range hood fan.

[0023] See appendix Figure 2 As shown, a dustproof net 3 is installed inside the air inlet of the inner pipe 2 located outdoors. The dustproof net 3, together with the retractable elbow 703, can effectively block dust and other debris from entering the room through the inner pipe 2 and affecting the indoor air quality.

[0024] Specifically, the cover plate 702 is a cover plate made of lightweight metal composite material; the lightweight cover plate 702 can ensure that even a small airflow can blow it open, which is conducive to timely balancing of the air pressure difference between indoors and outdoors.

[0025] Specifically, the connections between the inner tube 2 and the outer tube 1, and between the inner tube 2 and the elbow 703, are all sealed with adhesive (solvent bonding can be used), making the connections between the outer tube 1 and the inner tube 2, and between the inner tube 2 and the elbow 703 more stable, without affecting the sealing of the channel between the inner tube 2 and the outer tube 1, and ensuring the stability of the airflow inside the inner tube 2 and the outer tube 1.

[0026] Specifically, the outer pipe 1 is 500 mm to 700 mm long and 60 mm to 180 mm in diameter; the inner pipe 2 is 300 mm to 500 mm long and 30 mm to 90 mm in diameter. While ensuring that the outer pipe 1 can completely pass through the wall 4, energy consumption is minimized, and the unstable airflow speed inside the pipe due to excessive pipe length is avoided, which can easily generate eddies and vibration noise. At the same time, the pipe is also avoided from occupying too much space, affecting the interior and exterior decoration and aesthetics.

[0027] Combined with appendix Figure 1 To be continued Figure 4 The implementation principle of this utility model is described as follows: In use, the outer pipe 1 is horizontally embedded into the pre-drilled through hole in the wall. The air outlet of the inner pipe 2 is placed indoors. The gaps through the wall must be filled with fireproof material, and the insulation layer should be intact and undamaged to avoid condensation seeping into the wall due to temperature differences, resulting in dampness and mold. The indoor end of the outer pipe 1 is connected to the air outlet of the range hood fan via a flexible hose. The outdoor end of the outer pipe 1 is glued and fixed to the elbow 703, with the elbow 703 pointing vertically downwards. The outer end of the outer pipe 1 extending out of the wall 4 is fitted with a rain cap 5. When the fan is working, the high-temperature oily fumes are discharged from the room through the outer pipe 1, and negative pressure gradually appears indoors. Since the outdoor pressure is greater than the indoor pressure, the outside air will push open the cover 702, and the elbow... The airflow channel between 703 and inner pipe 2 is connected, allowing outdoor air to continuously enter the room through inner pipe 2. This balances the indoor and outdoor air pressure difference, which is beneficial for the exhaust of the range hood and avoids the problem of sewer odor caused by indoor negative pressure. Since the exhaust fumes carry heat, inner pipe 2 is fitted inside outer pipe 1. When the exhaust fumes are discharged from outer pipe 1, they preheat the air flowing from outside to inside in inner pipe 2 without contact, reducing the impact of outside airflow on indoor temperature. When the indoor and outdoor pressures are balanced, cover plate 702 falls naturally under its own weight, blocking the air outlet of elbow 703 and cutting off the passage for outdoor air to enter the room. The indoor temperature will not decrease due to the continuous entry of outdoor air. Rain cap 5 is fastened inside the outdoor end of outer pipe 1. Since a filter screen 501 is installed inside the rain cap, it can prevent rainwater and debris from entering outer pipe 1, thus avoiding affecting the normal exhaust of the range hood.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A preheating negative pressure ventilation adapter for a sealed heated room in winter, characterized in that, It includes an outer tube (1), a hollow inner tube (2) is sleeved inside the outer tube (1), an air flow channel is formed between the inner tube (2) and the outer tube (1), the inner tube (2) and the outer tube (1) are fixedly connected by a support frame (6), the air outlet of the inner tube (2) is vertically downward and penetrates the bottom wall of the outer tube (1); one end of the air inlet of the inner tube (2) is connected to an air inlet assembly (7). The air intake assembly (7) includes an elbow (703), one end of which is vertically downward and penetrates the bottom wall of the outer pipe (1); a cover plate (702) is rotatably covered at the other end of the elbow (703), and the air flow channel between the elbow (703) and the inner pipe (2) can be cut off when the cover plate (702) falls down.

2. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 1, characterized in that, The elbow (703) has a cover plate (702) at one end that is inwardly tapered, and a connecting seat (701) is fixed at the top of the elbow (703), with the connecting seat (701) rotatably connected to the cover plate (702).

3. The preheating negative pressure ventilation adapter for a sealed heated room in winter, as described in claim 1 or 2, is characterized in that... The outer pipe (1) runs horizontally through the wall (4). The air inlet of the outer pipe (1) is connected to the air outlet of the fan through a flexible hose. The air outlet of the outer pipe (1) is located outside the wall (4).

4. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 3, characterized in that, A rain cap (5) is snapped into the outer port of the outer tube (1) extending out of the wall (4). The rain cap (5) includes a retaining edge (502), which can be fitted into the outer tube (1). An arc-shaped rain cap is provided on the upper part of the retaining edge (502), and a filter screen (501) is installed inside the rain cap.

5. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 4, characterized in that, The inner tube (2) has a dustproof net (3) installed in the air inlet located outdoors.

6. The preheating negative pressure ventilation adapter for a sealed heated room in winter, as described in claim 1, 2, or 4, is characterized in that... The cover plate (702) is a cover plate made of lightweight metal composite material.

7. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 6, characterized in that, The connection between the inner tube (2) and the outer tube (1) is sealed by adhesive bonding.

8. The preheating negative pressure ventilation adapter for a winter-sealed heated room according to claim 1, 2, 4, 5, or 7, characterized in that, The connection between the inner tube (2) and the elbow (703) is sealed by adhesive bonding.

9. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 8, characterized in that, The outer tube (1) is 500 mm to 700 mm long and has a diameter of 60 mm to 180 mm.

10. The preheating negative pressure ventilation adapter for a sealed heated room in winter according to claim 9, characterized in that, The inner tube (2) is 300 mm to 500 mm long and 30 mm to 90 mm in diameter.

Images