CN220453851U - Building auxiliary ventilation device - Google Patents

Abstract

The utility model is applicable to the technical field part, and provides a building auxiliary ventilation device, which comprises: a filter box; a first partition plate; a second partition plate; the first rotating shaft is rotationally connected with the first partition plate and the second partition plate; the fan blades are uniformly arranged on the first rotating shaft; a first connecting tube is connected with the first connecting tube, is communicated with one side of the filter box, opposite to the fan blade; a second connection pipe; the filter plate is fixedly connected with the first partition plate and the second partition plate and is positioned at one side of the fan blade away from the first connecting pipe; the second rotating shaft is rotationally connected with the first partition plate and the second partition plate and is positioned between the second connecting pipe and the filter plate; the knocking mechanism is connected with the second rotating shaft and used for knocking the filter plate; the impurity removing push plate is abutted against the filter plate and connected with a reciprocating driving mechanism for driving the filter plate to move; the rotating mechanism is used for driving the second rotating shaft to rotate; the door opening and closing mechanism is arranged on the second partition plate and used for controlling the opening and closing state; the utility model has good filtering effect.

Description

A building auxiliary ventilation device

Technical field

The utility model belongs to the technical field, and particularly relates to a building auxiliary ventilation device.

Background technique

With the development of buildings, ventilation inside the building is also an indispensable and important point. The indoor and outdoor air is replaced through the fresh air system, and the air in multiple spaces can be shared by the same fresh air system through multiple cross-linked combinations of pipes. Replacement can reduce the use of materials and has a good energy-saving effect. The air inlet of the fresh air system is usually embedded inside the wall. Long-term use can easily accumulate impurities on the filter, so the staff needs to dismantle and clean it. The operation is more complicated, the cleaning efficiency is not high, and it is difficult to meet the daily cleaning of the ventilation inlet, and cannot ensure the normal use of the filter.

The prior art discloses a building energy-saving ventilation auxiliary device, which includes a frame. A placement slot is provided inside the frame, and a fan blade is provided on the outer surface of the front end of the frame. A filtering mechanism is provided inside the placement groove. The frame is provided with a filter mechanism. There is a collection mechanism at the lower end of the interior; the filtration mechanism includes a motor, a driving roller, a driven roller and a filter screen. The driving roller is connected to the motor. The driving roller and the driven roller are connected through the filter screen. The outer surfaces of both sides of the driving roller are fixed. A connecting column is connected, and a bearing is provided between the connecting column and the frame. The collection mechanism includes a cotton brush, a collection box, a pull block, a convex block and a slot. The brush cotton is set at the upper end of the collection box, and the pull block is fixedly connected. On the outer surface of one side of the collection box, the collection box can be placed better, and the filter can be better cleaned, without hindering the normal ventilation of the filter, and debris can be collected centrally to facilitate the work of the staff. Clean up and achieve efficiency.

There are flaws in the existing technology. Although part of the impurities can be cleaned by surface brushing with cotton, some of the impurities are nested in the filter screen, making it difficult to clean and affecting the filtration effect.

Utility model content

The purpose of the embodiments of the present invention is to provide a building auxiliary ventilation device, aiming to solve the problems described in the background art.

The embodiment of the present utility model is implemented in this way. A building auxiliary ventilation device includes:

filter box;

The first dividing plate is fixed on one side of the filter box;

The second partition board is fixed on the other side of the first partition board;

The first rotating shaft is rotatably connected to the first dividing plate and the second dividing plate;

The fan blades are evenly installed on the first rotating shaft;

The first connecting pipe is connected to one side of the filter box and is opposite to the fan blade;

The second connecting pipe is connected to the other side of the filter box;

The filter plate is fixedly connected to the first dividing plate and the second dividing plate, and is located on the side of the fan blade away from the first connecting pipe;

The second rotating shaft is rotatably connected to the first dividing plate and the second dividing plate, and is located between the second connecting pipe and the filter plate;

A knocking mechanism, connected to the second rotating shaft, is used to knock the filter plate;

The impurity removal push plate is in contact with the filter plate and is connected to a reciprocating driving mechanism that drives its movement;

a rotating mechanism for driving the second rotating shaft to rotate; and

The opening and closing door mechanism is provided on the second partition plate and is used to control the opening and closing state.

Preferably, the door opening and closing mechanism includes:

The opening and closing panel is nested in the second dividing panel;

The limit seat is fixed on the side of the opening and closing plate close to the debris removal push plate; and

The two ends of the elastic telescopic rod are respectively fixed to the opening and closing plate and the inner wall of the filter box.

Preferably, the reciprocating drive mechanism includes:

The eccentric wheel is installed on the first rotating shaft and is located on the side of the first dividing plate away from the second dividing plate;

The inclined plate is distributed obliquely, and one end is in contact with the inner wall of the filter box;

The slide block is fixed on the end of the inclined plate close to the eccentric wheel, fits and slides with the first dividing plate, and abuts against the eccentric wheel;

The connecting block abuts the sliding block away from the eccentric wheel; and

The guide sliding rod has one end fixed to the connecting block, and the other end penetrates the first dividing plate and is fixedly connected to the impurity removal push plate;

The guide sliding rod sleeve is equipped with a spring, and the spring is located between the connecting block and the first partition plate.

Preferably, the rotating mechanism includes:

The gear rod is fixedly connected to the inclined plate; and

The gear is installed on the second rotating shaft, located on the side of the first dividing plate away from the second dividing plate, and is meshed with the gear rod.

Preferably, the knocking mechanism includes:

The winding wheel is installed on the second rotating shaft;

The first fixed plate is fixedly connected to the inner wall of the filter box;

The knocking rod is slidingly connected to the first fixed plate;

The first connecting plate is fixed on the knocking rod and is located on the side of the first fixed plate close to the winding wheel;

The connecting rope has one end wound around the winding wheel and the other end fixedly connected to the first connecting plate;

The second connecting plate is fixed on the knocking rod and is located on the side of the first fixed plate away from the winding wheel;

a second fixed plate, fixed on the first fixed plate, opposite to the second connecting plate; and

The first elastic member is sleeved on the knocking rod and located between the first fixed plate and the second connecting plate;

The winding wheel is fixed to the second rotating shaft through a snap assembly.

Preferably, the clamping component includes:

The snap-on block is slidably arranged in the winding wheel, with one end being arc-shaped and partially nested in the second rotating shaft; and

The second elastic member is arranged in the winding wheel, and its two ends are respectively fixed to the bottom wall of the clamping block and the inner wall of the winding wheel;

The winding wheel is provided with several nesting grooves that cooperate with the clamping blocks.

Preferably, the impurity removal push plate includes:

Installation sleeve;

The slider is slidably installed in the installation sleeve;

A limit baffle, one end of which penetrates the installation sleeve and is fixedly connected to the slider, and the other end is provided with a slope facing the opening and closing door mechanism; and

The third elastic member is arranged in the installation sleeve, and its two ends are fixedly connected to the slider and the installation sleeve respectively.

Compared with the existing technology, the beneficial effects of the present invention are: by arranging a filter box, a first dividing plate, a second dividing plate, a first rotating shaft, a fan blade, a first connecting pipe, a second connecting pipe, a filter plate, second rotating shaft, knocking mechanism, impurity removal push plate, reciprocating driving mechanism, rotating mechanism and opening and closing door mechanism. When in use, the indoor status is detected through the temperature and humidity sensor. When ventilation is required, the air is drawn through a fan or air conditioner or Exhaust air, the air enters the filter box from the first connecting pipe, passes through the filter plate and is filtered, and is discharged from the second connecting pipe. At this time, the wind blows the fan blades, and the fan blades drive the first rotating shaft to rotate, and the first rotating shaft drives The reciprocating drive mechanism operates, and the reciprocating drive mechanism drives the impurity removal push plate to move. The impurity removal push plate moves along the filter plate, thereby scraping the garbage on the filter plate. At this time, the opening and closing door mechanism is turned to the open state, and the garbage falls into the The waste is collected between the second partition plate and the inner wall of the filter box. While the impurity removal push plate moves, the second rotating shaft is driven to rotate through the rotating mechanism. The second rotating shaft knocks the filter plate through the knocking mechanism, making it easier for the garbage to escape from the filter. Board, ingenious structure and easy to implement.

Description of drawings

Figure 1 is a schematic structural diagram of a building auxiliary ventilation device provided by an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a knocking mechanism in a building auxiliary ventilation device provided by an embodiment of the present utility model;

Figure 3 is a schematic structural diagram of a snap-in component in a building auxiliary ventilation device provided by an embodiment of the present utility model;

Figure 4 is a three-dimensional schematic view of a snap-in block in a building auxiliary ventilation device provided by an embodiment of the present utility model;

Figure 5 is a schematic structural diagram of a debris removal push plate in a building auxiliary ventilation device provided by an embodiment of the present invention.

In the drawings: 1-filter box; 2-first dividing plate; 3-second dividing plate; 4-first rotating shaft; 5-fan blade; 6-first connecting pipe; 7-second connecting pipe; 8-filter plate; 9-second rotating shaft; 10-inclined plate; 11-sliding block; 12-eccentric wheel; 13-connecting block; 14-guide slide rod; 15-gear rod; 16-gear; 17-winding Wheel; 18-first fixed plate; 19-knocking rod; 20-first connecting plate; 21-connecting rope; 22-second connecting plate; 23-second fixed plate; 24-first elastic member; 25- Snap block; 26-second elastic member; 27-nesting slot; 28-installation sleeve; 29-sliding block; 30-limit baffle; 31-third elastic member; 32-opening and closing plate; 33-limit Seat; 34-elastic telescopic rod; 100-percussion mechanism; 200-impurity removal push plate; 300-reciprocating drive mechanism; 400-rotating mechanism; 500-clip assembly; 600-opening and closing door mechanism.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clear, the utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

In the present invention, it should be understood that the terms "one end", "other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end" The orientation or positional relationship indicated by , "length", "outer end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In the present invention, unless otherwise expressly stipulated and limited, the terms "setting", "socketing", "connection", "penetrating", "plugging" and other terms should be understood in a broad sense. For example, it can be a fixed connection. , or it can be detachably connected, or integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the mutual connection of two elements. functional relationship, unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

As shown in Figure 1, a schematic structural diagram of a building auxiliary ventilation device provided in one embodiment of the present invention includes:

filter box 1;

The first partition plate 2 is fixed on one side of the filter box 1;

The second partition plate 3 is fixed on the other side of the first partition plate 2;

The first rotating shaft 4 is rotatably connected to the first partition plate 2 and the second partition plate 3;

Fan blades 5 are evenly installed on the first rotating shaft 4;

The first connecting pipe 6 is connected to one side of the filter box 1 and is opposite to the fan blade 5;

The second connecting pipe 7 is connected to the other side of the filter box 1;

The filter plate 8 is fixedly connected to the first partition plate 2 and the second partition plate 3, and is located on the side of the fan blade 5 away from the first connecting pipe 6;

The second rotating shaft 9 is rotatably connected to the first dividing plate 2 and the second dividing plate 3, and is located between the second connecting pipe 7 and the filter plate 8;

The knocking mechanism 100 is connected to the second rotating shaft 9 and is used to knock the filter plate 8;

The impurity removal push plate 200 is in contact with the filter plate 8 and is connected to a reciprocating drive mechanism 300 that drives its movement;

The rotating mechanism 400 is used to drive the second rotating shaft 9 to rotate; and

The opening and closing door mechanism 600 is provided on the second partition plate 3 and is used to control the opening and closing state.

In the embodiment of the present invention, when in use, the indoor status is detected through the temperature and humidity sensor. When ventilation is required, air is drawn or exhausted through a fan or air conditioner. The wind enters the filter box 1 from the first connecting pipe 6 and passes through the filter box 1 . After the filter plate 8 is filtered, it is discharged from the second connecting pipe 7. At this time, the wind blows the fan blade 5, and the fan blade 5 drives the first rotating shaft 4 to rotate. The first rotating shaft 4 drives the reciprocating driving mechanism 300 to operate, and the reciprocating driving mechanism 300 drives The impurity removal push plate 200 moves, and the impurity removal push plate 200 moves along the filter plate 8 to scrape off the garbage on the filter plate 8. At this time, the opening and closing door mechanism 600 is turned into an open state, and the garbage falls into the second partition. The garbage is collected between the plate 3 and the inner wall of the filter box 1. While the impurity removal push plate 200 moves, the second rotating shaft 9 is driven to rotate by the rotating mechanism 400. The second rotating shaft 9 knocks the filter plate 8 through the knocking mechanism 100, so that the garbage It is easier to detach from the filter plate 8, the structure is ingenious and easy to implement.

As shown in Figure 1, as a preferred embodiment of the present invention, the door opening and closing mechanism 600 includes:

The opening and closing plate 32 is nested in the second partition plate 3;

The limiting seat 33 is fixed on the side of the opening and closing plate 32 close to the impurity removal push plate 200; and

The two ends of the elastic telescopic rod 34 are fixed to the opening and closing plate 32 and the inner wall of the filter box 1 respectively.

In the embodiment of the present invention, when the impurity removal push plate 200 moves, the impurity removal push plate 200 scrapes off impurities, the impurity removal push plate 200 pushes the limit seat 33 to move, the limit seat 33 drives the opening and closing plate 32 to move, and the opening and closing plate 32 moves toward the inner wall of the filter box 1, and the opening and closing plate 32 drives the elastic telescopic rod 34 to shrink. At this time, the impurities fall into the space between the second partition plate 3 and the inner wall of the filter box 1 and are collected. When the impurity removal push plate 200 is reset, the opening and closing plate 32 moves towards the inner wall of the filter box 1. 32 is reset by the elastic force of the elastic telescopic rod 34.

As shown in Figure 1, as another preferred embodiment of the present invention, the reciprocating driving mechanism 300 includes:

The eccentric wheel 12 is installed on the first rotating shaft 4 and is located on the side of the first partition plate 2 away from the second partition plate 3;

The inclined plate 10 is distributed obliquely, and one end is in contact with the inner wall of the filter box 1;

The slider 11 is fixed on one end of the inclined plate 10 close to the eccentric 12, fits and slides with the first partition plate 2, and abuts against the eccentric 12;

The connecting block 13 abuts the slide block 11 away from the eccentric wheel 12; and

One end of the guide sliding rod 14 is fixed to the connecting block 13, and the other end penetrates the first partition plate 2 and is fixedly connected to the impurity removal push plate 200;

The guide sliding rod 14 is equipped with a spring, and the spring is located between the connecting block 13 and the first partition plate 2 .

In the embodiment of the present invention, when in use, the fan blade 5 drives the first rotating shaft 4 to rotate, the first rotating shaft 4 drives the eccentric wheel 12 to rotate, the eccentric wheel 12 squeezes the slider 11, and the slider 11 drives the inclined plate 10 to move. The inclined plate 10 squeezes the connecting block 13, and the connecting block 13 drives the guide slide 14 and the impurity removal push plate 200 to move. The impurity removal push plate 200 moves along the filter plate 8, thereby scraping off the garbage on the filter plate 8. At this time When the opening and closing door mechanism 600 is turned to the open state, the garbage falls into the space between the second partition plate 3 and the inner wall of the filter box 1 and is collected.

As shown in Figure 1, as another preferred embodiment of the present utility model, the rotating mechanism 400 includes:

The gear rod 15 is fixedly connected to the inclined plate 10; and

The gear 16 is installed on the second rotating shaft 9 , is located on the side of the first partition plate 2 away from the second partition plate 3 , and is meshed with the gear rod 15 .

In the embodiment of the present invention, when the inclined plate 10 moves, the inclined plate 10 drives the gear rod 15 to move, the gear rod 15 drives the gear 16 to rotate, the gear 16 drives the second rotating shaft 9 to rotate, and the second rotating shaft 9 passes through the knocking mechanism 100 Knock the filter plate 8 to make it easier for the garbage to escape from the filter plate 8.

As shown in Figures 2, 3, and 4, as another preferred embodiment of the present utility model, the knocking mechanism 100 includes:

The winding wheel 17 is installed on the second rotating shaft 9;

The first fixed plate 18 is fixedly connected to the inner wall of the filter box 1;

The knocking rod 19 is slidingly connected to the first fixed plate 18;

The first connecting plate 20 is fixed on the knocking rod 19 and is located on the side of the first fixed plate 18 close to the winding wheel 17;

The connecting rope 21 has one end wound around the winding wheel 17 and the other end fixedly connected to the first connecting plate 20;

The second connecting plate 22 is fixed on the knocking rod 19 and is located on the side of the first fixed plate 18 away from the winding wheel 17;

The second fixed plate 23 is fixed on the first fixed plate 18 and is opposite to the second connecting plate 22; and

The first elastic member 24 is sleeved on the knocking rod 19 and is located between the first fixed plate 18 and the second connecting plate 22;

The winding wheel 17 is fixed to the second rotating shaft 9 through the clamping assembly 500;

The clamping component 500 includes:

The clamping block 25 is slidably disposed in the winding wheel 17, with one end being arc-shaped and partially nested in the second rotating shaft 9; and

The second elastic member 26 is provided in the winding wheel 17, and its two ends are respectively fixed to the bottom wall of the clamping block 25 and the inner wall of the winding wheel 17;

The winding wheel 17 is provided with several nesting grooves 27 that cooperate with the clamping blocks 25 .

In the embodiment of the present invention, when the second rotating shaft 9 rotates, the second rotating shaft 9 drives the winding wheel 17 to rotate, the winding wheel 17 winds the connecting rope 21, and the connecting rope 21 drives the first connecting plate 20, The knocking rod 19 moves and slides along the first fixed plate 18. The knocking rod 19 drives the second connecting plate 22 to squeeze the first elastic member 24 until the second connecting plate 22 abuts the second fixed plate. 23, unable to move at this time, the second rotating shaft 9 squeezes the clamping block 25, and the clamping block 25 is squeezed and retracts into the winding wheel 17. At this time, the winding wheel 17 separates from the second rotating shaft 9, and in the first Under the elastic force of the elastic member 24, the second connecting plate 22 drives the knocking rod 19 to reset suddenly and knocks the filter plate 8.

As shown in Figure 5, as another preferred embodiment of the present invention, the impurity removal push plate 200 includes:

Installation set 28;

The slider 29 is slidably arranged in the installation sleeve 28;

The limit baffle 30 has one end that penetrates the installation sleeve 28 and is fixedly connected to the slider 29, and the other end is provided with a slope facing the opening and closing door mechanism 600; and

The third elastic member 31 is arranged in the installation sleeve 28, and its two ends are fixedly connected to the slider 29 and the installation sleeve 28 respectively.

In the embodiment of the present invention, when the installation sleeve 28 moves to the position of the door opening and closing mechanism 600, the limit stopper 30 can cooperate with the gap of the second partition plate 3 to seal it. The plate 30 drives the slider 29 to slide along the installation sleeve 28 and squeeze the third elastic member 31, and then the elastic force of the third elastic member 31 drives it to reset.

The above embodiment of the present invention provides a building auxiliary ventilation device, which is provided with a filter box 1, a first partition plate 2, a second partition plate 3, a first rotating shaft 4, a fan blade 5 and a first connecting pipe 6 , the second connecting pipe 7, the filter plate 8, the second rotating shaft 9, the knocking mechanism 100, the impurity removal push plate 200, the reciprocating driving mechanism 300, the rotating mechanism 400 and the opening and closing door mechanism 600. When used, through the temperature and humidity sensor Detect the indoor status. When ventilation is needed, air is drawn or exhausted through a fan or air conditioner. The air enters the filter box 1 from the first connecting pipe 6, passes through the filter plate 8 and is filtered, and is discharged from the second connecting pipe 7. This When the wind blows the fan blade 5, the fan blade 5 drives the first rotating shaft 4 to rotate. The first rotating shaft 4 drives the reciprocating drive mechanism 300 to operate. The reciprocating drive mechanism 300 drives the impurity removal push plate 200 to move, and the impurity removal push plate 200 moves along the filter plate. 8 moves to scrape off the garbage on the filter plate 8. At this time, the opening and closing door mechanism 600 is turned to the open state, and the garbage falls into the space between the second partition plate 3 and the inner wall of the filter box 1 and is collected. While the plate 200 is moving, the second rotating shaft 9 is driven to rotate by the rotating mechanism 400, and the second rotating shaft 9 strikes the filter plate 8 through the knocking mechanism 100, making it easier for the garbage to escape from the filter plate 8. The structure is ingenious and easy to implement.

The above descriptions are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the present utility model. Within the protection scope of utility model.

Claims (7)

1. A building auxiliary ventilation device, characterized in that it includes: filter box; The first dividing plate is fixed on one side of the filter box; The second partition board is fixed on the other side of the first partition board; The first rotating shaft is rotatably connected to the first dividing plate and the second dividing plate; The fan blades are evenly installed on the first rotating shaft; The first connecting pipe is connected to one side of the filter box and is opposite to the fan blade; The second connecting pipe is connected to the other side of the filter box; The filter plate is fixedly connected to the first dividing plate and the second dividing plate, and is located on the side of the fan blade away from the first connecting pipe; The second rotating shaft is rotatably connected to the first dividing plate and the second dividing plate, and is located between the second connecting pipe and the filter plate; A knocking mechanism, connected to the second rotating shaft, is used to knock the filter plate; The impurity removal push plate is in contact with the filter plate and is connected to a reciprocating driving mechanism that drives its movement; a rotating mechanism for driving the second rotating shaft to rotate; and The opening and closing door mechanism is provided on the second partition plate and is used to control the opening and closing state. 2. A building auxiliary ventilation device according to claim 1, characterized in that the door opening and closing mechanism includes: The opening and closing panel is nested in the second dividing panel; The limit seat is fixed on the side of the opening and closing plate close to the debris removal push plate; and The two ends of the elastic telescopic rod are respectively fixed to the opening and closing plate and the inner wall of the filter box. 3. A building auxiliary ventilation device according to claim 1, characterized in that the reciprocating driving mechanism includes: The eccentric wheel is installed on the first rotating shaft and is located on the side of the first dividing plate away from the second dividing plate; The inclined plate is distributed obliquely, and one end is in contact with the inner wall of the filter box; The slide block is fixed on the end of the inclined plate close to the eccentric wheel, fits and slides with the first dividing plate, and abuts against the eccentric wheel; The connecting block abuts the sliding block away from the eccentric wheel; and The guide sliding rod has one end fixed to the connecting block, and the other end penetrates the first dividing plate and is fixedly connected to the impurity removal push plate; The guide sliding rod sleeve is equipped with a spring, and the spring is located between the connecting block and the first partition plate. 4. A building auxiliary ventilation device according to claim 3, characterized in that the rotating mechanism includes: The gear rod is fixedly connected to the inclined plate; and The gear is installed on the second rotating shaft, located on the side of the first dividing plate away from the second dividing plate, and is meshed with the gear rod. 5. A building auxiliary ventilation device according to claim 1, characterized in that the knocking mechanism includes: The winding wheel is installed on the second rotating shaft; The first fixed plate is fixedly connected to the inner wall of the filter box; The knocking rod is slidingly connected to the first fixed plate; The first connecting plate is fixed on the knocking rod and is located on the side of the first fixed plate close to the winding wheel; The connecting rope has one end wound around the winding wheel and the other end fixedly connected to the first connecting plate; The second connecting plate is fixed on the knocking rod and is located on the side of the first fixed plate away from the winding wheel; a second fixed plate, fixed on the first fixed plate, opposite to the second connecting plate; and The first elastic member is sleeved on the knocking rod and located between the first fixed plate and the second connecting plate; The winding wheel is fixed to the second rotating shaft through a snap assembly. 6. A building auxiliary ventilation device according to claim 5, characterized in that the snap-on component includes: The snap-on block is slidably arranged in the winding wheel, with one end being arc-shaped and partially nested in the second rotating shaft; and The second elastic member is arranged in the winding wheel, and its two ends are respectively fixed to the bottom wall of the clamping block and the inner wall of the winding wheel; The winding wheel is provided with several nesting grooves that cooperate with the clamping blocks. 7. A building auxiliary ventilation device according to any one of claims 1 to 6, characterized in that the impurity removal push plate includes: Installation sleeve; The slider is slidably installed in the installation sleeve; A limit baffle, one end of which penetrates the installation sleeve and is fixedly connected to the slider, and the other end is provided with a slope facing the opening and closing door mechanism; and The third elastic member is arranged in the installation sleeve, and its two ends are fixedly connected to the slider and the installation sleeve respectively.