Negative-pressure anti-backflow building ventilating duct

Abstract

The utility model discloses a negative-pressure backflow-preventing building ventilating duct which comprises a ventilating duct body, a negative-pressure fan arranged at the front end in the ventilating duct body and used for negative pressure and a dustproof mechanism arranged in the middle of the inner side of the ventilating duct body. An anti-backflow plate is rotationally connected to the rear end of the interior of the ventilation pipeline body, and a blocking strip is fixedly connected to the position, in front of the anti-backflow plate, of the top face of the interior of the ventilation pipeline body; a storage groove is formed in the left side of the front end in the ventilation pipeline body, an ash discharging opening is formed in the front end of the bottom of the ventilation pipeline body, a collecting box is slidably connected into the bottom end of the front side of the ventilation pipeline body, and the outer side face of a backflow preventing plate is attached to the inner side face of the ventilation pipeline body. A motor is arranged in the middle of the left end of the rear side of the dustproof net. When the negative-pressure backflow-preventing building ventilation pipeline is used, negative-pressure backflow prevention can be achieved, and the situation that the ventilation effect is poor due to the fact that the air speed and the air quantity of ventilation are not uniform is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation duct technical field, concretely is a building ventilation duct of negative pressure backflow prevention. BACKGROUND

[0002] Building ventilation ducts are infrastructure in buildings that facilitate air circulation and reduce harmful gas concentrations. They enable air exchange between indoors and outdoors through metal or non-metal pipes, ensuring indoor air quality and people's health and comfort.

[0003] Referring to the authorized announcement No. CN211822979U of Chinese utility model patent discloses a kind of building ventilation ducts convenient for cleaning, it is related to ventilation duct relevant technical field, including main ventilation pipe, the bottom end of the main ventilation pipe is connected with secondary ventilation pipe, the outer side of the secondary ventilation pipe is fixedly installed with first fixed plate, the both sides of the main ventilation pipe are all provided with placing groove.The utility model is provided with first filter screen in fan frame, dust will be adsorbed by first filter screen when airflow passes through first filter screen, prevent dust from entering into main ventilation pipe interior to increase cleaning difficulty, by being provided with first fixed plate, second reset spring, placing block, second fixed plate and the mounting block on fan frame, fan frame is pushed up on secondary ventilation pipe corresponding, the second fixed plate of lower side is retracted and moves up, again rotating fan frame, make mounting block place to corresponding placing block, fan frame is locked by the reaction force of second reset spring, install more firmly, it is convenient to install and disassemble, it is convenient to clean.

[0004] Due to the combination of existing schemes and actual production and processing, there are still some problems in the current building ventilation duct, such as: the existing building ventilation duct is not convenient for negative pressure backflow prevention when ventilating, therefore, we propose a building ventilation duct of negative pressure backflow prevention to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a building ventilation duct of negative pressure backflow prevention to solve the problem of existing building ventilation duct not being convenient for negative pressure backflow prevention when ventilating.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a building ventilation duct of negative pressure backflow prevention, comprising:

[0007] The ventilation duct body and the negative pressure fan for negative pressure set in the front end of the ventilation duct body and the dust prevention mechanism set in the middle of the inner side of the ventilation duct body;

[0008] The backflow prevention plate is rotationally connected to the rear end of the ventilation duct body, and the top surface of the ventilation duct body is fixedly connected with a baffle in front of the backflow prevention plate;

[0009] The inside front end of the ventilation duct body is provided with a storage groove, and the bottom front end of the ventilation duct body is provided with an ash discharge port.

[0010] Preferably, the outer side of the anti-backflow plate is attached to the inner side of the ventilation duct body.

[0011] Preferably, the dust prevention mechanism is composed of a dust prevention net, a motor, a first gear disc, a second gear disc, a support rod and a scraping strip, the middle part of the rear left end of the dust prevention net is provided with the motor, the output shaft of the motor is fixedly connected with the first gear disc, the first gear disc is meshingly connected with the second gear disc at the front right end, the right side of the first gear disc is fixedly connected with the support rod, and the front side of the second gear disc is fixedly connected with the scraping strip.

[0012] Preferably, the motor is fixedly connected in the storage groove.

[0013] Preferably, the right end of the support rod is rotatably connected in the ventilation duct body.

[0014] Preferably, the rear side of the scraping strip is attached to the front side of the dust prevention net.

[0015] Preferably, the ash discharge port is provided at the front side of the dust prevention net.

[0016] Compared with the prior art, the negative pressure anti-backflow building ventilation duct can prevent dust from entering the inside of the duct and can centrally process dust.

[0017] 1. The inside front end of the ventilation duct body is fixedly connected with a negative pressure fan, the inside rear end of the ventilation duct body is rotatably connected with an anti-backflow plate, the outer side of the anti-backflow plate is attached to the inner side of the ventilation duct body, the top end inside the ventilation duct body is provided with a baffle in front of the anti-backflow plate, and when the top front side of the anti-backflow plate is attached to the rear side of the baffle, the anti-backflow plate is perpendicular in the inside of the ventilation duct body, and the negative pressure anti-backflow can be realized.

[0018] 2. The middle part front end of the inner side of the ventilation duct body is provided with a dust prevention mechanism, the motor is fixedly connected in the storage groove provided in the ventilation duct body, the motor, the first gear disc, the second gear disc, the support rod and the scraping strip constitute a linkage mechanism, and the rear side of the scraping strip is attached to the front side of the dust prevention net, so that dust can be prevented from entering the inside of the duct.

[0019] 3. The bottom end of the ventilation duct body is provided with an ash discharge port in front of the dust prevention net, and the collection box is slidably connected inside the front bottom of the ventilation duct body, the rear end of the collection box is located directly below the ash discharge port, the dust hanging down from the dust prevention net is collected in the collection box through the ash discharge port, and the dust is centrally processed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front perspective structure schematic view of the utility model;

[0021] Figure 2 It is a back perspective structure schematic view of the utility model;

[0022] Figure 3 It is a bottom perspective structure schematic view of the utility model;

[0023] Figure 4 It is a side perspective cut structure schematic view of the utility model;

[0024] Figure 5 It is a back perspective structure schematic view of the utility model's dustproof mechanism.

[0025] Figure 6 It is a back perspective structure schematic view of the utility model's dustproof mechanism.

[0026] In the figure: 1, ventilation duct body; 2, negative pressure fan; 3, baffle; 4, anti-backflow plate; 5, storage groove; 6, dust screen; 7, motor; 8, first tooth disc; 9, second tooth disc; 10, support rod; 11, scraping strip; 12, ash outlet; 13, collection box. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0028] Embodiment one: please refer to Figures 1-6 , the existing building ventilation duct, when ventilation, it is inconvenient to negative pressure anti-backflow, in order to solve this technical problem, the embodiment discloses the following technical content;

[0029] The negative pressure fan 2 for negative pressure is arranged at the front end inside the ventilation duct body 1, the anti-backflow plate 4 is rotatably connected to the rear end inside the ventilation duct body 1, the outer side of the anti-backflow plate 4 is attached to the inner side of the ventilation duct body 1, and the baffle 3 is fixedly connected to the inner top surface of the ventilation duct body 1 in front of the anti-backflow plate 4;

[0030] When the air is ventilated from the front end of the ventilation duct body 1 to the rear side, the negative pressure fan 2 is started, and the negative pressure fan 2 can make the air flow uniformly, when the air flows from the front side to the rear side, the upper end of the backflow prevention plate 4 moves to the rear side, at this time, the backflow prevention plate 4 is inclined, the air can flow normally, when the air flows back, the air flows from the rear to the front, the top end of the backflow prevention plate 4 is pushed to the front side, the top end of the backflow prevention plate 4 moves to the front side and is attached to the rear side of the blocking strip 3, at this time, the backflow prevention plate 4 blocks the inside of the ventilation duct body 1, which can prevent the air from flowing back;

[0031] Embodiment two: the existing building ventilation duct, when ventilating, dust enters the ventilation duct, it is inconvenient to prevent dust from entering the inside of the duct, and the blocked dust is inconvenient to collect, therefore, the embodiment is realized through the following technical scheme, as shown in Figures 1-6

[0032] The inside of the front end of the ventilation duct body 1 is provided with a storage groove 5, the dust prevention mechanism is composed of a dust prevention net 6, a motor 7, a first gear plate 8, a second gear plate 9, a supporting rod 10 and a scraping strip 11, the rear side left end of the dust prevention net 6 is provided with the motor 7, the motor 7 is fixedly connected in the storage groove 5, the output shaft of the motor 7 is fixedly connected with the first gear plate 8, the first gear plate 8 is meshingly connected with the second gear plate 9 at the front side right end, the right side of the first gear plate 8 is fixedly connected with the supporting rod 10, the right end of the supporting rod 10 is rotatably connected in the ventilation duct body 1, the front side of the second gear plate 9 is fixedly connected with the scraping strip 11, and the rear side of the scraping strip 11 is attached to the front side of the dust prevention net 6;

[0033] When ventilating, dust enters the inside of the ventilation duct body 1, at this time, the dust prevention net 6 blocks the dust, the dust is attached to the front side of the dust prevention net 6, when the dust accumulates too much, the dust prevention net 6 is blocked, at this time, the motor 7 needs to be started, the output shaft of the motor 7 rotates with the first gear plate 8, the first gear plate 8 rotates with the second gear plate 9, the second gear plate 9 rotates with the scraping strip 11, when the scraping strip 11 rotates, the dust attached to the front side of the dust prevention net 6 is scraped off, so that the dust prevention net 6 is prevented from being blocked by the dust;

[0034] The bottom front end of the ventilation duct body 1 is provided with a dust discharging port 12, the dust discharging port 12 is provided at the front side of the dust prevention net 6, and the inside of the front side bottom end of the ventilation duct body 1 is slidably connected with a collecting box 13;

[0035] The dust scraped off needs to be collected, the dust scraped off falls into the collecting box 13 through the dust discharging port 12, the rear side middle part of the collecting box 13 is provided with a clamping block, which is clamped and connected with the clamping groove provided in the inside of the bottom end of the ventilation duct body 1, the front side middle part of the collecting box 13 is provided with a concave groove, a finger is inserted into the concave groove, the collecting box 13 can be pulled out of the ventilation duct body 1, so that the dust in the collecting box 13 can be collected and treated.

[0036] ​The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0037] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A negative pressure anti-backflow building ventilation duct, comprising: The ventilation duct body (1) and the negative pressure fan (2) installed at the front end of the ventilation duct body (1) and the dustproof mechanism installed in the middle of the inner side of the ventilation duct body (1); Its features are: The ventilation duct body (1) is rotatably connected to the rear end of the interior with an anti-backflow plate (4), and a baffle (3) is fixedly connected to the top surface of the ventilation duct body (1) in front of the anti-backflow plate (4). The ventilation duct body (1) has a storage slot (5) on the left side of the front end, and a dust discharge port (12) is opened at the front end of the bottom of the ventilation duct body (1). A collection box (13) is slidably connected inside the bottom front side of the ventilation duct body (1).

2. The negative pressure anti-backflow building ventilation duct according to claim 1, characterized in that: The outer side of the anti-backflow plate (4) is in contact with the inner side of the ventilation duct body (1).

3. A negative pressure anti-backflow building ventilation duct according to claim 1, characterized in that: The dustproof mechanism is composed of a dustproof net (6), a motor (7), a first toothed disc (8), a second toothed disc (9), a support rod (10), and a scraper (11). The dustproof net (6) is provided with a motor (7) at the middle of the left rear end, and the output shaft of the motor (7) is fixedly connected to the first toothed disc (8). The first toothed disc (8) is meshed with the second toothed disc (9) at the right front end. The support rod (10) is fixedly connected to the right side of the first toothed disc (8), and the scraper (11) is fixedly connected to the front side of the second toothed disc (9).

4. A negative pressure anti-backflow building ventilation duct according to claim 3, characterized in that: The motor (7) is fixedly connected inside the storage slot (5).

5. A negative pressure anti-backflow building ventilation duct according to claim 3, characterized in that: The right end of the support rod (10) is rotatably connected inside the ventilation duct body (1).

6. A negative pressure anti-backflow building ventilation duct according to claim 3, characterized in that: The rear side of the scraper (11) is in contact with the front side of the dustproof net (6).

7. A negative pressure anti-backflow building ventilation duct according to claim 1, characterized in that: The ash discharge port (12) is located on the front side of the dustproof net (6).

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