Indoor silent fan capable of preventing airflow from flowing backwards

Abstract

The utility model relates to the technical field of fresh air, in particular to an air flow back-filling prevention indoor silent fan which comprises a fan body, an air inlet port and an air outlet port, the air inlet port and the air outlet port are arranged on the fan body, and a back-filling prevention assembly for limiting air flow filling is arranged in the air outlet port. The anti-backflow assembly comprises a fixing support installed in the air outlet port, an elastic support installed on the fixing support and two sets of sealing plates installed at the two ends of the elastic support, the opposite sides of the two sets of sealing plates are connected, and the two sets of sealing plates form a complete circular closed face under supporting of the elastic support to limit air flow entering in the reverse direction.

Description

Technical Field

[0001] The utility model relates to the technical field of fresh air, in particular to an indoor silent fan that prevents airflow backflow. Background Art

[0002] Active fresh air equipment requires the cooperation of a fan to extract turbid air from the room to facilitate the replenishment of fresh air;

[0003] At present, the air outlet of the fan in the fresh air system is directly connected to the outdoors. In windy weather, a large amount of dust will be poured into the air duct of the fan along with the airflow. For some fans with direct-through design, dust can be poured into the fan along with the airflow, resulting in dust residue in the fan, affecting the service life of the fan. In view of this, an indoor silent fan that prevents airflow backflow is proposed. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an indoor silent fan with anti-airflow backflow, which solves the problem that in windy weather, a large amount of dust will be injected into the air duct of the fan along with the airflow. For some fans with straight-through design, dust can be injected into the fan along with the airflow, thereby causing dust to remain in the fan and affecting the service life of the fan.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an indoor silent fan for preventing airflow backflow, comprising a fan body and an air inlet port and an air outlet port arranged on the fan body, wherein an anti-backflow component for limiting airflow inflow is arranged inside the air outlet port, and the anti-backflow component comprises a fixed bracket installed in the air outlet port, an elastic bracket installed on the fixed bracket, and two sets of sealing plates installed at both ends of the elastic bracket, wherein the two sets of sealing plates are connected at opposite sides;

[0006] The two groups of sealing plates form a complete circular closed surface under the support of the elastic bracket to limit the reverse airflow.

[0007] Preferably, the air outlet port includes an air outlet pipe and a fixed slot, the fixed slot is opened at the end of the air outlet pipe, and the fixed bracket is installed in the fixed slot and restricted by the fixed slot.

[0008] Preferably, screw holes for fixing are provided at both ends of the air outlet pipe, both ends of the fixing bracket are located in the air outlet pipe, and through holes matching with the screw holes provided on the air outlet pipe are provided on the ends of the fixing bracket.

[0009] Preferably, the elastic bracket is designed to be arc-shaped, and both end portions of the elastic bracket are transversely formed with straight sections, and the sealing plate is fixed on the straight sections of the elastic bracket.

[0010] Preferably, the two groups of sealing plates are both semicircular in design, and the two groups of sealing plates, supported by the elastic brackets, form a closed surface that matches the inside of the air outlet pipe.

[0011] Preferably, the two groups of sealing plates are connected by a repeatedly bendable flexible connection, and the two groups of sealing plates can be bent relative to the connection.

[0012] Preferably, the connection points between the two ends of the elastic bracket and the two groups of sealing plates are located at the edges of the two groups of sealing plates on opposite sides.

[0013] Preferably, the anti-backflow assembly further comprises a rotation limiting strip, and the rotation limiting strip is adhered to the surfaces of the two sets of sealing plates.

[0014] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0015] 1. By setting up an anti-backflow component, including a fixed bracket, an elastic bracket, and a sealing plate, two sets of sealing plates are connected at opposite sides. The two sets of sealing plates form a complete circular closed surface under the support of the elastic bracket to limit the reverse airflow and prevent dust from entering the fan with the airflow.

[0016] 2. When the gas flowing out of the air outlet pipe blows the sealing plate, the end of the sealing plate away from the elastic bracket is subjected to force, which drives the elastic bracket to deform, thereby releasing the seal of the air outlet pipe, and the air flow in the air outlet pipe is discharged through the sealing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a three-dimensional side view structural schematic diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the combined structure of the air outlet port and the anti-backflow component of the utility model;

[0020] Figure 4 This is a schematic diagram of the air outlet structure of the utility model;

[0021] Figure 5 It is a schematic diagram of the working state of the air outlet port of the utility model.

[0022] Among them: 1. fan body; 2. air inlet port; 3. air outlet port; 31. air outlet pipe; 32. fixing slot; 4. anti-backflow component; 41. bracket; 42. elastic bracket; 43. sealing plate; 44. rotation limiting strip. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0024] Embodiment:

[0025] like Figure 1-5 As shown, the utility model provides an indoor silent fan with anti-airflow backflow, comprising a fan body 1 and an air inlet port 2 and an air outlet port 3 arranged on the fan body 1. The fan body 1 draws airflow from the air inlet port 2 and sends it out from the air outlet port 3. The air outlet port 3 is provided with an anti-backflow component 4 for limiting the inflow of airflow inside. The anti-backflow component 4 comprises a fixed bracket 41 installed in the air outlet port 3, an elastic bracket 42 installed on the fixed bracket 41, and two groups of sealing plates 43 installed at both ends of the elastic bracket 42. The two groups of sealing plates 43 are connected at opposite sides. The two groups of sealing plates 43 form a complete circular closed surface under the support of the elastic bracket 42 to limit the reverse airflow.

[0026] The air outlet port 3 includes an air outlet pipe 31 and a fixing slot 32. The fixing slot 32 is opened at the end of the air outlet pipe 31. The fixing bracket 41 is installed in the fixing slot 32 and restricted by the fixing slot 32. Both ends of the air outlet pipe 31 are provided with screw holes for fixing. Both ends of the fixing bracket 41 are located in the air outlet pipe 31, and through holes that cooperate with the screw holes opened on the air outlet pipe 31 are opened on the ends of the fixing bracket 41. After the fixing bracket 41 is embedded in the fixing slot 32, the fixing bracket 41 is fixed in the fixing slot 32 by screws to form a stable connection structure.

[0027] The elastic bracket 42 is designed to be arc-shaped, and both ends of the elastic bracket 42 are laterally formed with straight sections. The sealing plates 43 are fixed on the straight sections of the elastic bracket 42. The two sets of sealing plates 43 are both designed to be semicircular. When not under force, the two sets of sealing plates 43 form a circular closed surface that matches the inside of the air outlet pipe 31 under the support of the elastic bracket 42. The formed circular closed surface can completely cover the air outlet pipe 31, thereby limiting the entry of external airflow.

[0028] The connection points between the two ends of the elastic bracket 42 and the two groups of sealing plates 43 are located at the edges of the opposite sides of the two groups of sealing plates 43. The anti-backflow component 4 also includes a rotation limiting pull strip 44, which is adhered to the surfaces of the two groups of sealing plates 43. In windy weather, the reverse airflow blows directly to the two groups of sealing plates 43. Under the blowing of the airflow and the support of the elastic bracket 42, the sealing plate 43 has a tendency to rotate around the elastic bracket 42 at one end away from the elastic bracket 42. At this time, the rotation limiting pull strip 44 adhered to the surface of the sealing plate 43 plays a pulling role on the sealing plate 43, limiting the rotation of the sealing plate 43, so that the two groups of sealing plates 43 maintain a complete expanded and closed state. When the gas flowing out from the air outlet pipe 31 blows the sealing plate 43, the end of the sealing plate 43 away from the elastic bracket 42 is subjected to force and drives the elastic bracket 42 to deform, thereby releasing the closure of the air outlet pipe 31, and the airflow in the air outlet pipe 31 is discharged through the sealing plate 43.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A silent indoor fan for preventing airflow backflow, characterized in that: The invention comprises a fan body (1), and an air inlet port (2) and an air outlet port (3) arranged on the fan body (1); an anti-backflow component (4) for limiting airflow inflow is arranged inside the air outlet port (3); the anti-backflow component (4) comprises a fixed bracket (41) installed in the air outlet port (3), an elastic bracket (42) installed on the fixed bracket (41), and two sets of sealing plates (43) installed at both ends of the elastic bracket (42); the two sets of sealing plates (43) are connected at opposite sides; The two groups of sealing plates (43) form a complete circular closed surface under the support of the elastic bracket (42), thereby limiting the airflow entering in the opposite direction.

2. The indoor silent fan for preventing airflow backflow according to claim 1, characterized in that: The air outlet port (3) comprises an air outlet pipe (31) and a fixed notch (32); the fixed notch (32) is provided at the end of the air outlet pipe (31); and the fixed bracket (41) is installed in the fixed notch (32) and is restricted by the fixed notch (32).

3. The indoor silent fan for preventing airflow backflow according to claim 2, characterized in that: Both ends of the air outlet pipe (31) are provided with screw holes for fixing, both ends of the fixing bracket (41) are located inside the air outlet pipe (31), and through holes are provided on the ends of the fixing bracket (41) to match the screw holes provided on the air outlet pipe (31).

4. The indoor silent fan for preventing airflow backflow according to claim 3, characterized in that: The elastic bracket (42) is designed to be arc-shaped, and both ends of the elastic bracket (42) are transversely formed with straight sections, and the sealing plate (43) is fixed on the straight section of the elastic bracket (42).

5. The indoor silent fan for preventing airflow backflow according to claim 3, characterized in that: The two sets of sealing plates (43) are both semicircular in design, and the two sets of sealing plates (43) are supported by the elastic brackets (42) to form a closed surface that matches the inside of the air outlet pipe (31).

6. The indoor silent fan for preventing airflow backflow according to claim 2, characterized in that: The two groups of sealing plates (43) are connected by a flexible connection that can be bent repeatedly, and the two groups of sealing plates (43) can be bent relative to the connection.

7. The indoor silent fan for preventing airflow backflow according to claim 2, characterized in that: The connection points between the two ends of the elastic bracket (42) and the two groups of sealing plates (43) are located at the edges of the opposite sides of the two groups of sealing plates (43).

8. The indoor silent fan for preventing airflow backflow according to claim 2, characterized in that: The anti-backflow assembly (4) further comprises a rotation limiting pull strip (44), wherein the rotation limiting pull strip (44) is adhered to the surfaces of the two sets of sealing plates (43).

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