Gas delivery anti-backflow universal air extraction hood

Abstract

The utility model discloses a kind of gas conveying anti-backflow universal air extraction cover, it is related to ventilation protective equipment technical field, including interfacing joint, the end surface rotation connection of two interfacing joints, the side of interfacing joint is connected with positioning cylinder, and two adjacent interfacing joints are connected with conveying pipe by positioning cylinder screw thread, the inner wall of conveying pipe is provided with protruding part, the inside of protruding part is sleeved with movable rod, the utility model is set protruding part in conveying pipe inner wall, and movable rod with blocking block is sleeved in protruding part inside, and side hole and central hole of being set with each other in movable rod are opened, and efficient anti-backflow structure is constructed, gas can be smoothly communicated by side hole and central hole when normal conveying, blocking block can quickly block passage when backflow occurs, effectively avoid gas reverse flow, solve the problem that existing device anti-backflow effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of ventilation and protection equipment technology, and in particular to a gas conveying anti-backflow universal exhaust hood. Background Technology

[0002] A universal exhaust hood is a ventilation and protection device used in laboratories and production environments. It is mainly used to discharge dust, heat, volatile harmful gases and small particulate matter generated during experiments or processing. It is commonly found in biological and chemical laboratories and welding fume extraction scenarios.

[0003] However, in existing technologies, most universal exhaust hoods lack effective backflow prevention structures. When the exhaust equipment stops operating or the air pressure fluctuates, the harmful gases that have been transported can easily flow back into the work area. Since universal exhaust hoods are often used in biological and chemical laboratories and welding fume extraction scenarios, the gases they transport are mostly dust, hot air, volatile harmful gases, and small particulate matter. Once these gases flow back into the work area, they will cause secondary pollution. Harmful gases can be inhaled by operators or come into contact with their skin and mucous membranes, leading to respiratory diseases, skin allergies, and other health problems. In severe cases, they can even cause irreversible damage to the nervous system and respiratory system, threatening the health and safety of operators. Utility Model Content

[0004] The purpose of this invention is to solve the problems of gas backflow and poor sealing of joint connections in the existing universal exhaust hood, and to propose a gas conveying anti-backflow universal exhaust hood.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas conveying anti-backflow universal exhaust hood, including connecting joints, two connecting joints having their end faces rotatably connected, a positioning cylinder connected to one side of each connecting joint, a conveying pipe threadedly connected between two adjacent connecting joints through the positioning cylinder, a protrusion provided on the inner wall of the conveying pipe, a movable rod sleeved inside the protrusion, a blocking block fixedly installed at both ends of the movable rod, the blocking block being located on one side of the end face of the protrusion, a central hole being opened inside the movable rod, a side hole being opened at the edge of the movable rod, and the central hole communicating with the side hole.

[0006] Preferably, the connecting joint has a cavity inside, the cavities between the two connecting joints are connected, and the cavity is connected to the delivery pipe.

[0007] Preferably, one of the connecting joints has an annular protrusion fixedly installed on its end face, and the other connecting joint has a groove with a shape adapted to the annular protrusion on its end face.

[0008] Preferably, the connecting joint located at the air inlet end is connected to an air extraction pipe via a positioning cylinder threaded connection.

[0009] Preferably, the end of the extraction pipe is connected to a gathering hood.

[0010] Preferably, the connecting joint located at the air outlet end is threadedly connected to an air outlet pipe via a positioning cylinder, and the air outlet pipe is rotatably connected to the air extraction device.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, by setting a protrusion on the inner wall of the conveying pipe and sleeved a movable rod with blocking blocks at both ends inside the protrusion, and opening side holes and a central hole that are interconnected on the movable rod, a highly efficient anti-backflow structure is constructed. During normal conveying, gas can flow smoothly through the side holes and the central hole. When backflow occurs, the blocking blocks can quickly block the passage, effectively preventing gas from flowing backward, and solving the problem of poor anti-backflow effect of existing devices.

[0012] 2. In this utility model, by setting annular protrusions and matching grooves on the end faces of the two connecting joints respectively, the sealing performance of the joint rotation connection is enhanced and gas leakage is reduced. At the same time, the positioning cylinder is used to realize the threaded connection between the connecting joint and the conveying pipe, the suction pipe and the exhaust pipe. This not only facilitates the disassembly and maintenance of components, but also greatly improves the flexibility of the overall device through the rotational connection between the exhaust pipe and the suction equipment, combined with the angle adjustment function of the connecting joint. The position and direction can be adjusted according to actual needs to adapt to different working scenarios, thus solving the problems of poor sealing and low flexibility of existing devices. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a gas conveying anti-backflow universal exhaust hood proposed in this utility model; Figure 2 This is a schematic diagram of the internal structure of the connecting joint of a gas conveying anti-backflow universal exhaust hood proposed in this utility model; Figure 3 This is a schematic diagram of the internal structure of the conveying pipe of a gas conveying anti-backflow universal exhaust hood proposed in this utility model; Figure 4 This is a three-dimensional structural diagram of the movable rod of a gas conveying anti-backflow universal exhaust hood proposed in this utility model.

[0014] Legend: 1. Connecting joint; 2. Positioning cylinder; 3. Conveying pipe; 4. Suction pipe; 5. Gathering hood; 6. Exhaust pipe; 7. Cavity; 8. Annular protrusion; 9. Protrusion; 10. Movable rod; 11. Blocking block; 12. Side hole; 13. Center hole. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a gas conveying anti-backflow universal exhaust cover, including a connecting joint 1, two connecting joints 1 are rotatably connected at their end faces, a positioning cylinder 2 is connected to one side of the connecting joint 1, and a conveying pipe 3 is threadedly connected between two adjacent connecting joints 1 through the positioning cylinder 2. A protrusion 9 is provided on the inner wall of the conveying pipe 3, and a movable rod 10 is sleeved inside the protrusion 9. A blocking block 11 is fixedly installed at both ends of the movable rod 10. The blocking block 11 is located on one side of the end face of the protrusion 9. A central hole 13 is opened inside the movable rod 10, and a side hole 12 is opened at the edge of the movable rod 10. The central hole 13 and the side hole 12 are connected.

[0018] The specific setup and function of this embodiment are described below. The two connecting joints 1 are connected by rotation at their end faces, allowing for flexible adjustment of the angle and direction of the overall extraction hood to meet the gas extraction needs of different locations. The positioning cylinder 2 connected to one side of the connecting joint 1 serves as a connector. The two adjacent connecting joints 1 are threadedly connected to the delivery pipe 3 through the positioning cylinder 2, forming a stable gas delivery channel. During the delivery process, the gas flows through the delivery pipe 3. When the gas is being delivered normally, the airflow pushes the movable rod 10 to move inside the protrusion 9 on the inner wall of the delivery pipe 3. At this time, the gap between the side hole 12 on the edge of the movable rod 10 and the protrusion 9 forms a passage, allowing the gas to enter the central hole 13 normally and exit through the side hole 12. 2. When gas backflow occurs, the reverse airflow pushes the movable rod 10, causing the blocking blocks 11 at both ends of the movable rod 10 to tightly fit the end face of the protrusion 9, thereby blocking the passage between the side hole 12 and the protrusion 9, preventing the gas from flowing back, and achieving the anti-backflow effect. The anti-backflow structure composed of the protrusion 9 on the inner wall of the conveying pipe 3, the movable rod 10, the blocking blocks 11, the side hole 12 and the central hole 13 can ensure smooth airflow when the gas is being conveyed normally, and quickly block backflow when there is a risk of backflow, effectively avoiding the safety hazards or reduced conveying efficiency caused by reverse gas flow. The overall design takes into account both practicality and safety, and improves the reliability and stability of the gas conveying process.

[0019] Example 2: Figure 1 and Figure 2 As shown, the connecting joint 1 has a cavity 7 inside, and the cavities 7 between the two connecting joints 1 are connected. The cavity 7 is connected to the conveying pipe 3. An annular protrusion 8 is fixedly installed on the end face of one connecting joint 1, and a groove with a shape that matches the annular protrusion 8 is opened on the end face of the other connecting joint 1. The connecting joint 1 located at the air inlet end is threadedly connected to the air extraction pipe 4 through the positioning cylinder 2. The end of the air extraction pipe 4 is connected to the gathering cover 5. The connecting joint 1 located at the air outlet end is threadedly connected to the air outlet pipe 6 through the positioning cylinder 2. The air outlet pipe 6 is rotatably connected to the air extraction device.

[0020] The overall effect of this embodiment is that the cavity 7 inside the connecting joint 1 is connected to the delivery pipe 3, and the cavities 7 of the two connecting joints 1 are connected to form a complete gas flow path; the annular protrusion 8 on the end face of one connecting joint 1 cooperates with the matching groove on the end face of the other connecting joint 1 to improve the sealing and stability of the rotating connection; the end of the suction pipe 4 is connected to the gathering cover 5, which is responsible for introducing gas; the outlet pipe 6 is rotatably connected to the suction equipment, which makes it easy to adjust the direction of the entire device to align with the target area; the gas enters the suction pipe 4 through the gathering cover 5, and then is transported to the suction equipment through the cavity 7, delivery pipe 3, and outlet pipe 6; the rotatable connection between the outlet pipe 6 and the suction equipment improves the adaptability and flexibility of the device and the suction equipment; at the same time, the threaded connection of the positioning cylinder 2 ensures that the components are easy to disassemble and assemble; the overall structure further improves the sealing, adaptability and ease of operation of the gas delivery.

[0021] The operating method and working principle of this device are as follows: The annular protrusion 8 on the end face of the connecting joint 1 matches the matching groove on the end face of the other connecting joint 1. By adjusting the angle of the connecting joint 1, the two connecting joints 1 are connected through the cavity 7. At the same time, the threaded connection of the positioning cylinder 2 connects the two adjacent connecting joints 1 to the conveying pipe 3. The suction pipe 4 and the collecting hood 5 are located at the air inlet of the entire device. The air outlet pipe 6 is rotatably connected to the suction equipment, which can directly adjust the direction of the entire device so that the collecting hood 5 is aligned with the target area where gas needs to be extracted. After the suction equipment is started, the gas first enters the collecting hood 5, then enters the suction pipe 4 through the collecting hood 5, and then the gas flows from the suction pipe 4 into the air inlet. The gas enters the delivery pipe 3 through the cavity 7 of the connecting joint 1 and the cavity 7 connecting the two connecting joints 1. When the gas flows through the delivery pipe 3, it acts on the movable rod 10 sleeved inside the protrusion 9 on the inner wall of the delivery pipe 3, pushing the movable rod 10 to move. At this time, the gap between the side hole 12 on the edge of the movable rod 10 and the protrusion 9 forms a passage, and the gas can normally enter the central hole 13 and flow out from the side hole 12. However, when gas backflow occurs, the reverse airflow will push the movable rod 10, so that the blocking blocks 11 at both ends of the movable rod 10 tightly fit the end face of the protrusion 9, thereby blocking the passage between the side hole 12 and the protrusion 9, preventing the gas from flowing back, and achieving the anti-backflow effect.

[0022] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A gas conveying anti-backflow universal exhaust hood, characterized in that: The device includes a connecting joint (1), with the end faces of two connecting joints (1) rotatably connected. A positioning cylinder (2) is connected to one side of the connecting joint (1). A conveying pipe (3) is threaded between two adjacent connecting joints (1) through the positioning cylinder (2). A protrusion (9) is provided on the inner wall of the conveying pipe (3). A movable rod (10) is sleeved inside the protrusion (9). A blocking block (11) is fixedly installed at both ends of the movable rod (10). The blocking block (11) is located on one side of the end face of the protrusion (9). A central hole (13) is opened inside the movable rod (10). A side hole (12) is opened at the edge of the movable rod (10). The central hole (13) and the side hole (12) are connected.

2. The gas conveying anti-backflow universal exhaust hood according to claim 1, characterized in that: The connecting joint (1) has a cavity (7) inside, and the cavities (7) between the two connecting joints (1) are connected. The cavity (7) is connected to the delivery pipe (3).

3. A gas conveying anti-backflow universal exhaust hood according to claim 1, characterized in that: One of the connecting joints (1) has an annular protrusion (8) fixedly installed on its end face, and the other connecting joint (1) has a groove with a shape that matches the annular protrusion (8) on its end face.

4. A gas conveying anti-backflow universal exhaust hood according to claim 1, characterized in that: The connecting joint (1) located at the air inlet end is threadedly connected to the air extraction pipe (4) via the positioning cylinder (2).

5. A gas conveying anti-backflow universal exhaust hood according to claim 4, characterized in that: The end of the extraction pipe (4) is connected to a gathering hood (5).

6. A gas conveying anti-backflow universal exhaust hood according to claim 1, characterized in that: The connecting joint (1) located at the air outlet end is threadedly connected to the air outlet pipe (6) through the positioning cylinder (2), and the air outlet pipe (6) is rotatably connected to the air extraction device.

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