Movable large-diameter pipeline ventilation equipment with built-in grid induction

Abstract

The movable large-diameter pipeline ventilation equipment comprises an air inlet pipe, an air duct, an exhaust pipe and a base, the air inlet pipe is horizontally arranged on the base, the air duct and the air inlet pipe are connected to form an inverted-T-shaped pipeline, the exhaust pipe is arranged at the end of the air duct, the air inlet pipe comprises an air baffle, a fan, an air valve, a grating and a transverse pipeline, and the transverse pipeline is arranged on the air baffle. The grille is installed at the end of the transverse pipeline, a connecting hole is formed in the side wall of the transverse pipeline and connected with the air duct, the air baffle penetrates through the connecting hole and extends into the air duct, the top of the air valve is connected with the bottom of the air baffle, and the fan is installed at the end, away from the grille, of the transverse pipeline. Semi-communication between the air inlet pipe and the air duct is achieved through the air valve and the air baffle, the air valve regulator controls the air valve to be in an opening or closing state, and when the air valve is opened, air is supplied to a working area through the air inlet pipe; when the air valve is closed, air flow is exhausted from the top of the working area through the semi-communicating channel, and the ventilation efficiency and ventilation effectiveness of the working area are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline through technical field especially a movable built-in grid induction's large -diameter pipeline ventilation equipment. BACKGROUND

[0002] The ventilation device is a kind of equipment that can be ventilated to closed not flow environment, it absorbs the air of outside into the body after filtering and is inhaled into inside, keeps the good air environment of inside;Many construction operations at present need to be welded or worked in large-diameter pipeline, and the problem of inconvenient ventilation often affects the safety and efficiency of construction;The existing ventilation equipment faces the problem of insufficient effectiveness of ventilation equipment in practical application, leading to poor air circulation, affecting the work comfort and work efficiency of operating personnel;Generally, large-diameter pipeline is long, and some existing ventilation equipment is difficult to adapt to pipeline of different diameters and lengths, especially for larger pipeline, the effectiveness of conventional equipment is reduced, and some ventilation equipment is bulky and inconvenient to move, thus a ventilation equipment that is convenient to move and can ensure the effectiveness of ventilation needs to be designed. INVENTION CONTENTS

[0003] The utility model discloses a movable built-in grid induction's large -diameter pipeline ventilation equipment, and the semi-communication of air inlet pipe and air duct is realized by air valve and baffle, air valve regulator controls air valve to be in open or closed state, air valve opens, and air is sent to work area through air inlet pipe, and the ventilation effect of work area is realized;Air valve closes, and wind flow is discharged from the top of work area through semi-communication channel, improve the ventilation efficiency and ventilation effectiveness of work area.

[0004] To realize the above-mentioned purpose, the utility model adopts the technical scheme: a movable built-in grid induction's large -diameter pipeline ventilation equipment, including air inlet pipe, air duct, exhaust pipe and base, the air inlet pipe is horizontally arranged on the base, the air duct is connected with the top of air inlet pipe away from base and forms inverted T-shaped pipeline along the length direction end, the exhaust pipe is horizontally arranged on the end of air duct away from air inlet pipe and is connected with air duct through connecting portion, the air inlet pipe includes baffle, fan, air valve, grid and transverse pipeline, the grid is installed in the length direction end of transverse pipeline, the lateral wall of transverse pipeline is provided with connecting hole along the length direction, the edge of connecting hole is connected with air duct, the baffle and air valve are all arranged at connecting hole, the baffle extends upwards to the air duct after passing through connecting hole, the baffle is tightly attached to the inner side wall of air duct along the width direction and separates air duct along the central axis, the air valve is embedded in transverse pipeline, the top of air valve is connected with the bottom of baffle to facilitate the flow of air current in the air duct along air valve and baffle when air valve closes, and the fan is installed in the end of transverse pipeline away from grid.

[0005] Preferably, the air duct comprises a vertical pipe and a heat absorbing wall plate, and the heat absorbing wall plate is screwed with the vertical pipe along the length direction.

[0006] Preferably, the air inlet pipe further comprises a filter screen and a damper regulator, the filter screen is installed at the end of the horizontal pipe away from the grid, and the damper regulator is installed on the outer side wall of the horizontal pipe and connected with the damper to control the opening or closing of the damper.

[0007] Preferably, the connecting part comprises a hose and a flange, and the two ends of the hose along the length direction are connected with the air duct and the air outlet pipe through the flange.

[0008] Preferably, the air outlet pipe comprises a converging pipe, a diverging pipe and a diffusion air inlet pipe, the large-diameter end of the converging pipe is connected with the hose through the flange, the small-diameter end of the converging pipe is connected with the end of the diffusion air inlet pipe along the length direction, and the end of the diffusion air inlet pipe away from the converging pipe is connected with the small-diameter end of the diverging pipe.

[0009] Preferably, the diffusion air inlet pipe is provided with a ventilation opening on the side close to the horizontal pipe to facilitate the air flow to converge to the air outlet pipe.

[0010] Preferably, the base comprises a support frame and rollers, the support frame is in a U-shaped structure, the rollers are arranged at the bottom of the support frame at the positions of four corners, the air inlet pipe is embedded in the support frame, and the inner side wall of the vertical end of the support frame is tightly attached to the air inlet pipe.

[0011] Preferably, the flange is a large-diameter loose flange.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The base is provided with a support frame and rollers, the support frame supports the air inlet pipe, the air duct and the air outlet pipe upward, and when the working area position in the large-diameter pipe is changed, the ventilation equipment is moved to the working area to be worked through the rollers, so that the equipment is moved and effective ventilation is realized.

[0014] 2. The air duct and the air outlet pipe are connected through the hose and the flange, the air duct and the air outlet pipe are communicated through the hose and the flange during work, the hose and the flange are removed when the equipment is maintained, the air duct and the air outlet pipe are separated in structure, and the equipment maintenance cost is reduced.

[0015] 3. The air inlet pipe and the air duct are semi-connected through the damper and the baffle, the damper regulator controls the damper to be in the open or closed state, the air inlet pipe sends air to the working area when the damper is opened, the ventilation effect of the working area is realized, and the air flow is discharged from the top of the working area through the semi-connected channel when the damper is closed, so that the ventilation efficiency and the ventilation effectiveness of the working area are improved.

[0016] 4, The utility model discloses utilize the radiation heat of heat absorption wallboard to absorb welding etc. hot process, increase the temperature difference in pipe, thereby increase the buoyancy of air flow in pipe, improve ventilation efficiency, reduce ventilation energy consumption, make hot air can more smoothly discharge.

[0017] 5, The utility model discloses the diffusion air suction pipe bottom is equipped with the ventilation opening, and the airflow of tapering tube enters the diffusion air suction pipe and produces negative pressure, provides secondary airflow sufficient ventilation power under the action of negative pressure, makes the hot airflow of work area flow into the diffusion air suction pipe through the ventilation opening and then discharges through the gradually expanding pipe, improves the air replacement efficiency of work area.

[0018] Below, through the drawing and embodiment, this utility model is described further in detail. DRAWINGS

[0019] Figure 1 It is the structural diagram of the utility model;

[0020] Figure 2 It is the position relation diagram of the utility model grid, air valve and baffle.

[0021] Mark explanation:

[0022] 1 - hose; 2 - flange; 3 - exhaust pipe;

[0023] 4 - gyro wheel; 5 - baffle; 6 - heat absorption wallboard;

[0024] 7 - air inlet pipe; 8 - base; 9 - fan;

[0025] 10 - air duct; 11 - connecting hole; 12 - filter screen;

[0026] 13 - tapering pipe; 14 - gradually expanding pipe; 15 - diffusion air suction pipe;

[0027] 16 - air valve; 17 - air valve regulator; 18 - vertical duct;

[0028] 19 - grid; 20 - horizontal duct; 21 - ventilation opening;

[0029] 22 - support frame. DETAILED DESCRIPTION

[0030] As Figure 1 , Figure 2The utility model discloses a movable built-in grating induced large -diameter pipeline ventilation equipment, including air inlet pipe 7, air duct 10, exhaust pipe 3 and base 8, air inlet pipe 7 is horizontally established on base 8, and the end of air duct 10 along the length direction is connected with the top of air inlet pipe 7 away from base 8 and forms inverted T shaped pipeline, and exhaust pipe 3 is horizontally established at the end of air duct 10 away from air inlet pipe 7 and is connected with air duct 10 through connecting portion, air inlet pipe 7 includes baffle 5, fan 9, air valve 16, grating 19 and transverse pipeline 20, grating 19 is installed at the end of transverse pipeline 20 along the length direction, and the side wall of transverse pipeline 20 along the length direction is equipped with connecting hole 11, and the edge of connecting hole 11 is connected with air duct 10, and baffle 5 and air valve 16 are all established at connecting hole 11, and baffle 5 extends upwards to air duct 10 after passing through connecting hole 11, and baffle 5 is tightly attached with the inner side wall of air duct 10 along the width direction and separates air duct 10 along the central axis, and air valve 16 is embedded in transverse pipeline 20, and the top of air valve 16 is connected with the bottom of baffle 5, which is convenient for the airflow to flow into air duct 10 along air valve 16 and baffle 5 when air valve 16 is closed, and fan 9 is installed at the end of transverse pipeline 20 away from grating 19.

[0031] In the embodiment, air inlet pipe 7 is horizontally clamped in base 8, air duct 10 is vertically installed on the top of air inlet pipe 7 and is half communicated with air inlet pipe 7, exhaust pipe 3 is connected with air duct 10 through connecting portion, exhaust pipe 3 is parallel with air inlet pipe 7, and the ventilation equipment can be pushed to move through base 8; after the airflow passes through grating 19, enters transverse pipeline 20, the direction of the airflow entering transverse pipeline 20 can be adjusted through grating 19, if air valve 16 is in the open state, the airflow flows horizontally along transverse pipeline 20 and is sent into the working area under the action of fan 9, if air valve 16 is in the closed state, air valve 16 and baffle 5 are in the same vertical plane to limit the horizontal flow of the airflow, after the airflow enters transverse pipeline 20, flows upwards along air valve 16 and baffle 5 and enters air duct 10, and flows vertically upwards along air duct 10 and is discharged from exhaust pipe 3, two flow modes of the airflow are realized through the opening and closing of air valve 16, and the ventilation efficiency of the working area is improved.

[0032] In one possible embodiment, the transverse duct 20 is horizontally arranged in the base 8, the connecting hole 11 is a circular hole arranged on the top of the transverse duct 20, the connecting hole 11 is located at the middle of the transverse duct 20 along the length direction, the air valve 16 is arranged at the connecting hole 11, the bottom of the wind baffle 5 is connected with the air valve 16 to facilitate the fixation of the wind baffle 5, the wind baffle 5 and the air valve 16 are located in the same vertical plane and are parallel to the grating 19 at the end of the transverse duct 20, the air duct 10 is connected with the edge of the connecting hole 11 after passing through the wind baffle 5 downward, the air duct 10 is divided into a first air duct and a second air duct by the wind baffle 5, the first air duct is close to the grating 19, the second air duct is close to the working area and far away from the grating 19, the first air duct is communicated with the transverse duct 20, and then the first air duct and the air valve 16 form an induced air duct, when the air valve 16 is in the closed state, the air entering the transverse duct 20 flows upward along the air valve 16 to enter the first air duct and is discharged from the exhaust duct 3, and the second air duct is disconnected with the transverse duct 20.

[0033] In another possible embodiment, different from the above-mentioned embodiment, the connecting hole 11 is a semicircular hole, the arc segment of the connecting hole 11 is close to the grating 19, the top of the air valve 16 is connected with the side of the connecting hole 11 far away from the grating 19, the air duct 10 is a semicircular duct, the end of the arc segment of the air duct 10 is connected with the edge of the arc segment of the connecting hole 11, and the end of the horizontal segment of the air duct 10 is connected with the edge of the side of the connecting hole 11 far away from the grating 19, the air duct 10 and the air valve 16 form an induced air duct, and when the air valve 16 is in the closed state, the air entering the transverse duct 20 flows upward along the air valve 16 to enter the air duct 10 and is discharged from the exhaust duct 3.

[0034] The air duct 10 comprises the vertical duct 18 and the heat-absorbing wall plate 6, and the heat-absorbing wall plate 6 is threadedly connected with the vertical duct 18 along the length direction.

[0035] In this embodiment, the end of the vertical duct 18 along the length direction is connected with the connecting hole 11 on the transverse duct 20 to form a T-shaped duct, the heat-absorbing wall plate 6 is installed on the side wall of the vertical duct 18 close to the working area, the heat-absorbing wall plate 6 absorbs the heat generated by the working area, heats the air flow in the vertical duct 18 by means of heat radiation, the heated air flow makes the air density in the vertical duct 18 decrease, and the air flow in the vertical duct 18 flows upward under the action of the buoyancy force, the air flow in the vertical duct 18 continuously flows upward to form an induced air flow, the air flow entering the transverse duct 20 continuously flows upward along the vertical duct 18 and is discharged along the exhaust duct 3, and displacement ventilation is realized.

[0036] The heat absorption wall plate 6 is screwed to the side wall of the vertical duct 18, and is convenient to replace. The heat absorption wall plate 6 absorbs heat generated in the working area and exchanges heat with the airflow in the vertical duct 18. Different heat is generated according to different types of workers. If the heat generated in the working area cannot meet the basic requirement of heating air, the heat absorption wall plate 6 can be replaced with a heat absorption material with good heat absorption property and screwed to the side wall of the vertical duct 18, so as to realize the induction of air.

[0037] The wind baffle 5 is tightly attached to the inner side wall of the vertical duct 18 along the length direction. The width of the wind baffle 5 is the same as the diameter of the vertical duct 18. The wind baffle 5 separates the vertical duct 18 along the central axis. The side of the vertical duct 18 close to the grille 19 is communicated with the horizontal duct 20, and the side of the vertical duct 18 away from the grille 19 is not communicated with the horizontal duct 20. The horizontal duct 20 and the vertical duct 18 form a semi-communicated channel. The grille 19, the air valve 16 and the wind baffle 5 form a wind induction channel together. When the air valve 16 is in the closed state, the wind baffle 5 and the air valve 16 are in the same vertical plane. The airflow enters the horizontal duct 20 from the grille 19, moves upward along the air valve 16 and the wind baffle 5, flows into the vertical duct 18, and is discharged from the exhaust duct 3.

[0038] The air inlet pipe 7 further comprises a filter screen 12 and an air valve regulator 17. The filter screen 12 is installed at the end of the horizontal duct 20 away from the grille 19. The air valve regulator 17 is installed on the outer side wall of the horizontal duct 20 and connected with the air valve 16, so as to control the opening or closing of the air valve 16.

[0039] In this embodiment, the air valve regulator 17 is connected to the air valve 16 to control the opening and closing of the air valve 16. The temperature threshold of the air valve regulator 17 is set in advance according to the environment of the work area, which is suitable for the temperature at which the workers can work comfortably, which can be any temperature such as 30℃, 31℃ or 32℃. After starting work, the air valve regulator 17 continuously collects the temperature in the large-diameter pipeline. If the current temperature is lower than the temperature threshold, the air valve regulator 17 controls the air valve 16 to open, and the airflow in the large-diameter pipeline enters the horizontal pipeline 20 through the grille 19. Since the vertical pipeline 18 is half-communicated with the horizontal pipeline 20, the airflow has two flow directions after entering the horizontal pipeline 20. Under the action of the fan 9, the main airflow flows horizontally, and the main airflow flows forward through the filter screen 12 and then flows to the work area, realizing air supply to the work area and meeting the ventilation requirement of the work area. Since the air supply mode is down air supply, the hot airflow in the work area flows upward under the action of the air supply airflow, forming displacement ventilation. Displacement ventilation is a special ventilation mode, which supplies fresh air from the bottom of the work area, and the hot and polluted air in the work area rises under the action of buoyancy and is discharged from the exhaust pipe 3 at the top, thereby ensuring that the air in the work area is in a suitable state. A small part of the airflow flows upward along the vertical pipeline 18 and flows out of the exhaust pipe 3. If the temperature in the large-diameter pipeline collected by the air valve regulator 17 exceeds the temperature threshold, the work area needs to be ventilated, the air valve regulator 17 controls the air valve 16 to close, the air valve 16 is in the same vertical plane as the air baffle 5, the airflow entering the horizontal pipeline 20 through the grille 19 is blocked by the air valve 16, the airflow enters the vertical pipeline 18 upward along the air valve 16 and the air baffle 5, the heat absorbing panel 6 heats the airflow in the vertical pipeline 18 through heat radiation, the heated airflow flows upward at a high speed and is discharged through the exhaust pipe 3, thereby improving the discharge efficiency of the hot airflow in the work area. The air valve regulator 17 continuously monitors the temperature in the large-diameter pipeline and controls the air valve 16 to open or close based on the temperature threshold to ventilate the large-diameter pipeline, thereby ensuring the comfort of the workers.

[0040] Further, a first fan is installed in the horizontal pipeline 20, and the first fan is close to the grille 19. The first fan sucks the air in the large-diameter pipeline into the horizontal pipeline 20. The air entering the horizontal pipeline 20 flows out of the filter screen 12 to the work area under the action of the fan 19. The first fan accelerates the flow speed of the air in the large-diameter pipeline, thereby accelerating the air circulation in the large-diameter pipeline.

[0041] The connecting part includes a hose 1 and a flange 2. The two ends of the hose 1 in the length direction are connected to the air duct 10 and the exhaust pipe 3 through the flange 2 respectively.

[0042] The flange 2 is a large-diameter loose flange.

[0043] In the embodiment, the air duct 10 is a vertical pipe, the exhaust pipe 3 is a horizontal pipe, the hose 1 is folded into an L-shaped structure, the transverse end of the hose 1 is connected with the air inlet of the exhaust pipe 3 through the flange 2, the vertical end of the hose 1 is connected with the air outlet of the air duct 10 through the flange 2, the air duct 10 and the exhaust pipe 3 are connected through the flange 2 and the hose 1, so that the air flow in the air duct 10 is discharged from the exhaust pipe 3, after working for a certain period of time, the flange 2 and the hose 1 are removed, the air duct 10 and the exhaust pipe 3 are separated in structure, so that the air duct 10 and the exhaust pipe 3 are cleaned, and the pipeline maintenance cost is reduced.

[0044] The exhaust pipe 3 comprises a converging pipe 13, a diverging pipe 14 and a diffusion suction pipe 15, the large-diameter end of the converging pipe 13 is connected with the hose 1 through the flange 2, the small-diameter end of the converging pipe 13 is connected with the end of the diffusion suction pipe 15 along the length direction, and the end of the diffusion suction pipe 15 away from the converging pipe 13 is connected with the small-diameter end of the diverging pipe 14.

[0045] The diffusion suction pipe 15 is provided with an air vent 21 on the side close to the horizontal pipe 20, so that the air flow is collected to the exhaust pipe 3.

[0046] In the embodiment, the converging pipe 13, the diffusion suction pipe 15 and the diverging pipe 14 form a Venturi tube structure after being connected, after the air flow enters the converging pipe 13 from the air duct 10, the air flow speed in the converging pipe 13 gradually increases and the air flow pressure decreases with the gradually reduced pipe cross section of the converging pipe 13, so that the air flow entering the diffusion suction pipe 15 generates negative pressure, the air flow in the lower working area is induced to enter the diffusion suction pipe 15 through the air vent 21, the induced air flow and the main air flow are combined and discharged from the diverging pipe 14, the air flow discharged through the air vent 21 is increased, and the air replacement efficiency of the working area is accelerated.

[0047] The base 8 comprises a support frame 22 and the rollers 4, the support frame 22 is a U-shaped structure, the rollers 4 are arranged at the bottom four corner positions of the support frame 22, the air inlet pipe 7 is embedded in the support frame 22, and the inner side wall of the vertical end of the support frame 22 is tightly attached to the air inlet pipe 7.

[0048] In a possible embodiment, the support frame 22 comprises a horizontal plate and a vertical plate, the horizontal plate and the vertical plate are the same in length, the number of the vertical plates is two, and the two vertical plates are perpendicularly connected with the horizontal plate along the length direction, the left and right sides of the horizontal pipe 20 along the length direction are tightly attached to the inner side walls of the two vertical plates respectively, the rollers 4 are universal wheels, the number of the rollers 4 is four, and the four rollers 4 are arranged at the bottom four corner positions of the horizontal plate respectively, so as to facilitate the movement of the ventilation system.

[0049] Further, two fastening holes are arranged on the two opposite vertical plates respectively, the fastening holes are arranged at the positions close to the horizontal plate of the vertical plate, the two fastening holes of each vertical plate are arranged at the two ends of the vertical plate along the length direction, the binding rope is fastened and connected with the two opposite fastening holes by being wound around the two end portions of the horizontal pipeline 20 respectively, the binding rope is closely attached to the side wall of the horizontal pipeline 20 to fasten the horizontal pipeline 20 on the base 8, so that the horizontal pipeline 20 is prevented from sliding out of the base 8 during movement.

[0050] In use, the ventilation system is pushed to the working area of the large-diameter pipeline, the fan 9 and the air valve regulator 17 are started, the air valve regulator 17 continuously monitors the temperature in the large-diameter pipeline, when the air valve regulator 17 detects that the current temperature is lower than the temperature threshold, the air valve regulator 17 opens the air valve 16, the air flow enters the horizontal pipeline 20 from the grille 19, flows horizontally through the filter screen 12 under the action of the fan 9, and is sent to the working area, the hot air flow in the working area flows upward under the action of the air flow, and displacement ventilation is formed, when the air valve regulator 17 detects that the current temperature reaches the temperature threshold, the air valve regulator 17 controls the air valve 16 to be closed, the air flow entering the horizontal pipeline 20 from the grille 19 is blocked by the air valve 16, the air flow flows upward along the air valve 16 and the baffle 5, the heat absorbing wall plate 6 heats the air flow entering the vertical pipeline 18 in a heat radiation mode, the heated air flow drives the air flow in the vertical pipeline 18 to flow upward under the action of the buoyancy, the air flow flows at a high speed after entering the converging pipe 13, and because the diffusion air inlet pipe 15 is provided with the air inlet 21 at the bottom, the accelerated air flow generates negative pressure when passing through the diffusion air inlet pipe 15, so that the hot air flow in the lower working area is induced to enter the diffusion air inlet pipe 15, the hot air flow is mixed with the main air flow and is discharged from the diverging pipe 14, displacement ventilation is realized; the air valve 16 realizes two ventilation modes of displacement ventilation and air supply to the working area, the air circulation efficiency of the working area is improved, and the comfort of the workers in operation is enhanced.

[0051] The above is only a preferred embodiment of the present application, and does not limit the present application in any way, any simple modification, change and equivalent structure change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical scheme of the present application.

Claims

1. A mobile built-in grille induced large-diameter duct ventilation device, characterized in that: The air inlet pipe (7) is horizontally arranged on the base (8), the air duct (10) is connected with the top of the air inlet pipe (7) away from the base (8) to form an inverted T-shaped pipe, the air outlet pipe (3) is horizontally arranged on the end of the air duct (10) away from the air inlet pipe (7) and is connected with the air duct (10) through a connecting part, the air inlet pipe (7) comprises a wind baffle (5), a fan (9), an air valve (16), a grille (19) and a transverse pipe (20), the grille (19) is installed on the end of the transverse pipe (20) in the length direction, the side wall of the transverse pipe (20) in the length direction is provided with a connecting hole (11), the edge of the connecting hole (11) is connected with the air duct (10), the wind baffle (5) and the air valve (16) are arranged at the connecting hole (11), the wind baffle (5) extends upwards into the air duct (10) after passing through the connecting hole (11), the wind baffle (5) is tightly attached to the inner side wall of the air duct (10) in the width direction to separate the air duct (10) along the central axis, the air valve (16) is embedded in the transverse pipe (20), the top of the air valve (16) is connected with the bottom of the wind baffle (5) to facilitate the air flow along the air valve (16) and the wind baffle (5) into the air duct (10) when the air valve (16) is closed, and the fan (9) is installed on the end of the transverse pipe (20) away from the grille (19).

2. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 1, characterized in that: The air duct (10) comprises a vertical pipe (18) and a heat absorbing wall plate (6), and the heat absorbing wall plate (6) is threadedly connected with the vertical pipe (18) in the length direction.

3. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 1, characterized in that: The air inlet pipe (7) further comprises a filter screen (12) and an air valve regulator (17), the filter screen (12) is installed on the end of the transverse pipe (20) away from the grille (19), and the air valve regulator (17) is installed on the outer side wall of the transverse pipe (20) and is connected with the air valve (16) to facilitate the control of the opening or closing of the air valve (16).

4. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 1, characterized in that: The connecting part comprises a hose (1) and a flange (2), and the two ends of the hose (1) in the length direction are respectively connected with the air duct (10) and the air outlet pipe (3) through the flange (2).

5. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 4, characterized in that: The air outlet pipe (3) comprises a converging pipe (13), a diverging pipe (14) and a diffusion air suction pipe (15), the large-diameter end of the converging pipe (13) is connected with the hose (1) through the flange (2), the small-diameter end of the converging pipe (13) is connected with the end of the diffusion air suction pipe (15) in the length direction, and the end of the diffusion air suction pipe (15) away from the converging pipe (13) is connected with the small-diameter end of the diverging pipe (14).

6. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 5, characterized in that: The diffusion air suction pipe (15) is provided with a ventilation opening (21) on the side close to the transverse pipe (20) to facilitate the air flow to the air outlet pipe (3).

7. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 1, characterized in that: The base (8) comprises a support frame (22) and a roller (4), the support frame (22) is in a U-shaped structure, the bottom of the support frame (22) is provided with the roller (4) at the positions of four corners, the air inlet pipe (7) is embedded in the support frame (22), and the vertical end inner side wall of the support frame (22) is tightly attached to the air inlet pipe (7).

8. A mobile, built-in, grating-induced, large-diameter duct ventilation device according to claim 4, characterized in that: The flange (2) is a large-diameter loose flange.

Images