Self-suction type exhaust fan

Abstract

The self-suction type exhaust fan comprises a nozzle (1), an outer sleeve (2), a connecting guide pipe (3), an air outlet cavity (4), a first connector (5), a second connector (6), a ball valve (7) and a third connector (8), the nozzle (1), the outer sleeve (2) and the connecting guide pipe (3) are fixedly assembled to form a compressed air spraying cavity, and the nozzle (1) is fixedly connected with the air outlet cavity (4) through a first self-plugging rivet (9), a second self-plugging rivet (10) and a third self-plugging rivet (11). And the first joint (5) is in threaded connection with the ball valve (7) through the second joint (6) and the third joint (8) after being fixedly assembled with the outer sleeve (2). According to the self-suction type exhaust fan, harmful and dangerous gas in a narrow closed cabin can be easily and rapidly removed, a safe and healthy working environment is provided for constructors, the working efficiency and the labor productivity are improved, and operators can operate and use the self-suction type exhaust fan without being independently trained.

Description

Technical Field

[0001] The utility model relates to the field of rapid removal of dangerous gases such as electric welding fumes, hot air, oil gas and smoke in narrow and enclosed cabins and oil tanks during ship repair, and particularly relates to a self - suction type exhaust fan. Background Technique

[0002] During ship repair, when electric welding and hot work need to be carried out in narrow and enclosed cabins or oil tanks, dangerous gases such as electric welding fumes, hot air, oil gas and smoke in the cabins cannot be discharged in time and efficiently. When construction workers carry out construction in such an operating environment, not only is the construction efficiency low, but also it poses great harm to the physical health of construction workers, and even there is a hidden danger of personal injury and death such as poisoning and asphyxiation of personnel. In view of the above problems, a self - suction type exhaust fan that can easily and quickly remove harmful and dangerous gases in narrow and enclosed cabins is designed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a self - suction type exhaust fan that can easily and quickly remove harmful and dangerous gases in narrow and enclosed cabins, provide a safe and healthy working environment for construction workers, and improve work efficiency.

[0004] The technical solution adopted by the utility model to achieve the above purpose is: a self - suction type exhaust fan, which includes a nozzle (1), an outer sleeve pipe (2), a connecting conduit (3), an air outlet cavity (4), a first joint (5), a second joint (6), a ball valve (7) and a third joint (8). The nozzle (1) is fixedly assembled with the outer sleeve pipe (2) and the connecting conduit (3) to form a compressed air injection cavity and is fixedly connected with the air outlet cavity (4) through a first blind rivet (9), a second blind rivet (10) and a third blind rivet (11). The first joint (5) is fixedly assembled with the outer sleeve pipe (2) and is threadedly connected with the ball valve (7) through the second joint (6) and the third joint (8).

[0005] A handle (14) is installed on the air outlet cavity (4).

[0006] The handle (14) is fixed on the air outlet cavity (4) through a fourth blind rivet (12) and a fifth blind rivet (13).

[0007] The self - suction type exhaust fan of the utility model can easily and quickly remove harmful and dangerous gases in narrow and enclosed cabins, provide a safe and healthy working environment for construction workers, improve work efficiency and labor productivity. Operators can operate and use it without separate training. It is light in weight and small in size, and does not require a separate power source. It can quickly complete the gas replacement in the cabin by using the compressed air on the ship or at the shipyard dock. It has a simple structure, convenient operation and low cost. A single person can completely meet the requirement of quickly replacing dangerous gases such as electric welding fumes, hot air, oil gas and smoke in narrow and enclosed cabins and oil tanks. Brief Description of the Drawings

[0008] Figure 1 is a schematic diagram of the overall structure of a self-priming exhaust fan of the present utility model.

[0009] Figure 2 is a schematic diagram of the usage state of a self-priming exhaust fan of the present utility model.

[0010] In the figure: 1, nozzle; 2, outer sleeve; 3, connecting conduit; 4, air outlet cavity; 5, first joint; 6, second joint; 7, ball valve, 8, third joint; 9, first blind rivet; 10, second blind rivet; 11, third blind rivet; 12, fourth blind rivet; 13, fifth blind rivet; 14, handle; 15, first circular cable tie; 16, rubber hose; 17, compressed air source; 18, second circular cable tie; 19, plastic ventilation duct. Detailed Description of the Preferred Embodiment

[0011] As Figure 1 and Figure 2As shown in the figure, the self-priming exhaust fan includes a nozzle 1, an outer sleeve 2, a connecting conduit 3, an air outlet chamber 4, a first joint 5, a second joint 6, a ball valve 7, a third joint 8, and a handle 14. The nozzle 1, the outer sleeve 2, and the connecting conduit 3 are fixedly assembled into a compressed air injection chamber and fixedly connected to the air outlet chamber 4 through the first blind rivet 9, the second blind rivet 10, and the third blind rivet 11. After the first joint 5 is fixedly assembled with the outer sleeve 2, it is threadedly connected to the ball valve 7 through the second joint 6 and the third joint 8. The handle 14 is fixed on the air outlet chamber 4 through the fourth blind rivet 12 and the fifth blind rivet 13. When the self-priming exhaust fan is in use, the compressed air source 17 enters the self-priming exhaust fan through the rubber hose 16 fixed by the first annular tie 15. After the compressed air enters the compressed air injection chamber of the fan, it forms a jet with a small volume and high flow rate through the small holes on the nozzle 1 and sprays out, driving a large amount of gas around the cabin to enter the conical air outlet chamber 4 made of galvanized iron sheet to form a jet airflow. The harmful and dangerous gases in the narrow and enclosed cabin finally are discharged through the plastic ventilation pipe 19 fixed by the second annular tie 18, achieving the purpose of air replacement in the cabin. The self-priming exhaust fan of the present utility model needs to be used in cooperation with the compressed air on the ship or at the shipyard dock. The nozzle, the outer sleeve, and the connecting conduit are welded and assembled into a compressed air injection chamber. The compressed air enters the small-volume and high-flow-rate nozzle through the joint welded on the compressed air injection chamber and sprays out, driving a large amount of gas around the cabin to enter the conical air outlet chamber made of galvanized iron sheet to form a jet airflow, and finally is discharged through the plastic ventilation pipe, achieving the purpose of air replacement in the cabin, providing a safe and healthy working environment for construction workers. Before and after the construction starts, the construction workers control the supply of compressed air by switching the compressed air inlet valve, and can conveniently and efficiently meet the requirements of the self-priming exhaust fan to enter and exit the cabin through the quick-insert joint of the air duct. The self-priming exhaust fan has the characteristics of simple structure, convenient operation, and cost saving. A single person can completely meet the requirements of quickly replacing dangerous gases such as welding fumes, hot air, oil gas, and smoke in narrow and enclosed cabins and oil tanks and oil cabinets.

Claims

1. A self-priming exhaust fan, characterized in that: It includes a nozzle (1), an outer sleeve (2), a connecting conduit (3), an air outlet cavity (4), a first joint (5), a second joint (6), a ball valve (7) and a third joint (8). The nozzle (1) is fixedly assembled with the outer sleeve (2) and the connecting conduit (3) to form a compressed air injection cavity and is fixedly connected to the air outlet cavity (4) through a first blind rivet (9), a second blind rivet (10) and a third blind rivet (11). After the first joint (5) is fixedly assembled with the outer sleeve (2), it is threadedly connected to the ball valve (7) through the second joint (6) and the third joint (8).

2. The self-priming exhaust fan according to claim 1, characterized in that: A handle (14) is installed on the air outlet cavity (4).

3. The self-priming exhaust fan according to claim 2, wherein: The handle (14) is fixed on the air outlet cavity (4) through a fourth blind rivet (12) and a fifth blind rivet (13).

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