Limited space air conveying pipeline flow direction conversion device

Abstract

This utility model discloses a confined space air duct flow direction switching device, comprising: a dust control duct, one end of which is connected to the confined space, and the other end of which is connected to the outside; a ventilation duct, the outlet end of which is connected to the confined space; and a connecting duct, the middle section of which is connected to the middle section of the dust control duct. A switching structure is installed at the connection points of the ventilation duct and the connecting duct, and at the connection points of the dust control duct and the connecting duct. The switching structure is used to switch the flow of the ventilation duct and the flow of the dust control duct, thereby realizing the switching of ventilation and dust removal flow directions within a confined space. This utility model can complete the switching of ventilation and dust removal flow directions within a confined space.

Description

Technical Field

[0001] This utility model relates to a flow direction conversion device for a confined space air supply pipeline, belonging to the field of air supply pipeline control technology. Background Technology

[0002] In confined space operations such as tunnel construction, mining, and underground engineering, fresh air must be continuously supplied for ventilation to ensure the respiratory safety and health of workers. Simultaneously, during dust-generating processes like drilling, blasting, and breaking, dust-laden air must be promptly extracted and purified to improve the working environment. However, current ventilation and dust control systems in confined space operations mostly operate independently, lacking an efficient collaborative switching mechanism. This switching method suffers from problems such as frequent equipment start-ups and shutdowns leading to high energy consumption and difficulty in precise control based on real-time operating conditions. This process affects the effectiveness of ventilation and dust control, failing to effectively eliminate dust pollution while meeting personnel's respiratory needs, severely impacting work efficiency and personnel health. Therefore, there is an urgent need to develop a device for the efficient collaborative switching of ventilation and dust control modes in confined spaces. Utility Model Content

[0003] According to one aspect of the present invention, a confined space air duct flow direction switching device is provided, which can switch the flow direction of ventilation and dust removal within a confined space.

[0004] A confined space air supply pipeline flow direction conversion device, characterized in that it comprises: A dust control pipeline, one end of which is connected to a confined space and the other end of which is connected to the outside; A ventilation duct, the outlet end of which is connected to a confined space; A connecting pipe is provided, wherein the middle part of the ventilation pipe is connected to the middle part of the dust control pipe through a connecting pipe; A switching structure is installed at the connection between the ventilation duct and the connecting duct, and at the connection between the dust control duct and the connecting duct. The switching structure is used to switch the flow of the ventilation duct and the flow of the ventilation duct and the dust control duct, thereby realizing the switching of ventilation and dust removal flow direction.

[0005] Furthermore, the dust control duct is parallel to the ventilation duct; The connecting pipes are respectively arranged perpendicularly to the dust control pipe and the ventilation pipe.

[0006] Furthermore, the conversion structure includes a switching structure and an isolation structure; The switching structure is located outside the air supply duct, and the isolation structure is located inside the air supply duct. They are respectively located at the connection points between the dust control duct and the ventilation duct and the connecting duct, and are rotatably connected to the duct at the connection point. The switching structure is connected to the isolation structure and is used to adjust the position of the isolation structure to switch whether the airflow in the ventilation duct and the airflow between the ventilation duct and the dust control duct are flowing.

[0007] Furthermore, the switching structure includes a first rotating shaft, a second rotating shaft, and a connecting rod. The first rotating shaft passes through the air supply pipe and is installed at the connection between the ventilation pipe and the connecting pipe. The second rotating shaft passes through the air supply pipe and is installed at the connection between the dust control pipe and the connecting pipe. A first rotating mechanism is provided at the end of the first rotating shaft, and a second rotating mechanism is provided at the end of the second rotating shaft. The first rotating mechanism and the second rotating mechanism are connected by the connecting rod to achieve synchronous rotation of the isolation structure. The first and second rotating shafts are connected to the isolation structure to enable the rotation of the isolation structure.

[0008] Furthermore, the isolation structure includes a first isolation plate and a second isolation plate; The first isolation plate is connected to the first rotating shaft and is used to control the flow of the ventilation duct to the confined space or the flow of the ventilation duct to the dust control duct; The second isolation plate is connected to the second rotating shaft and is used to control the flow between the dust control pipeline and the outside or the flow from the ventilation pipeline to the dust control pipeline.

[0009] Furthermore, the connecting pipes, dust control pipes, and ventilation pipes have the same diameter; The sizes of the first and second isolation plates are adapted to the diameters of the connecting pipes, dust control pipes, and ventilation pipes.

[0010] Furthermore, the dust control pipeline on one side, which communicates with the confined space, includes a retractable flexible pipe and a rigid pipe connected at the ends. The retractable flexible pipe is used to prevent bending and blocking of airflow.

[0011] Furthermore, the retractable flexible tube is mounted on the tail frame of the conveyor belt via a first support member, and the rigid tube is mounted on a bridge belt frame via a second support member. The bridge belt frame 14 moves on the tail frame of the conveyor belt via rollers at its bottom, thereby enabling the rigid tube to move closer to the retractable flexible tube and completing the extension and retraction of the retractable flexible tube.

[0012] Furthermore, the first support member includes a first support frame fixed on the tailstock of the conveyor belt, the crossbeam of the first support frame being a guide rail along the telescopic direction of the telescopic flexible tube, and the telescopic flexible tube being mounted on the guide rail by a hanger. The second support member includes a second support frame fixed to the bridge belt frame, and the rigid tube is mounted on the second support frame; The horizontal height of the guide rail on the first support frame is higher than the horizontal height of the second support frame.

[0013] The beneficial effects that this utility model can produce include: 1. The confined space air duct flow direction conversion device provided by this utility model, through the setting of connecting pipes, ventilation pipes, and dust control pipes, and the setting of conversion structures at the connection of connecting pipes with ventilation pipes and dust control pipes, realizes efficient coordinated switching of ventilation and dust control pipes, avoids the high energy consumption caused by frequent start-up and shutdown of traditional independent system equipment, can accurately control the airflow direction according to real-time operating conditions, and while ensuring the fresh air needs of workers in confined spaces, it can also timely and efficiently discharge dust-laden air, significantly improve the ventilation and dust control effect, and effectively protect work efficiency and personnel health.

[0014] 2. The confined space air supply pipeline flow direction conversion device provided by this utility model sets the part of the dust control pipeline connected to the confined space as a stretchable soft pipe to avoid bending and blocking the airflow. At the same time, corresponding support components are set for installation support. It does not rely on the roadway roof to hang and fix the air duct and other equipment, thus realizing the automation of tunneling machinery. Attached Figure Description

[0015] Figure 1 This is a switching state diagram of a confined space air supply pipeline flow direction conversion device in one embodiment of the present invention; Figure 2 This is the installation structure of the air supply pipeline in a confined space air supply pipeline flow direction conversion device according to one embodiment of the present invention. Figure 1 ; Figure 3 This is the installation structure of the air supply pipeline in a confined space air supply pipeline flow direction conversion device according to one embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the installation structure of the first support frame and the second support frame in a confined space air duct flow direction conversion device according to one embodiment of the present invention. List of components and reference numerals: 1-Connecting pipe; 2-Dust control pipe; 3-Ventilation pipe; 4-First connecting shaft; 5-Second connecting shaft; 6-Connecting rod; 7-First rotating mechanism; 8-Second rotating mechanism; 9-First isolation plate; 10-Second isolation plate; 11-Extendable flexible pipe; 12-Rigid pipe; 13-Tail frame of conveyor belt; 14-Bridge belt frame; 15-Roller; 16-First support frame; 17-Guide rail; 18-Hanging wheel; 19-Second support frame. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the embodiments, but the present invention is not limited to these embodiments.

[0017] See Figure 1 A confined space air duct flow direction conversion device, characterized in that it comprises: Dust control pipe 2, one end of which is connected to a confined space and the other end of which is connected to the outside; Ventilation duct 3, the outlet end of which is connected to a confined space; Connecting pipe 1, the middle part of the ventilation pipe 3 is connected to the middle part of the dust control pipe 2 through connecting pipe 1; A switching structure is installed at the connection between the ventilation duct 3 and the connecting duct 1 and at the connection between the dust control duct 2 and the connecting duct 1. The switching structure is used to switch the flow of the ventilation duct 3 and the dust control duct 2, thereby realizing the switching of ventilation and dust removal flow direction.

[0018] Specifically, one end of the dust control duct connects to a confined space (such as a mine or enclosed workshop), and the other end can be connected to external dust removal equipment to exhaust dust or harmful gases from the confined space. The ventilation duct inlet supplies fresh air to the confined space, maintaining positive pressure or providing oxygen. A connecting duct links the ventilation and dust control ducts in the middle, forming a "T"-shaped intersection, serving as a hub for flow path switching. A switching structure is installed at the duct intersection to change the flow direction by switching.

[0019] The system incorporates a switching structure, installed at the junctions of the ventilation duct and the connecting duct, as well as the dust control duct and the connecting duct. This switching structure allows for flexible switching of the airflow direction between the ventilation duct and the available space, and between the ventilation duct and the dust control duct. The switching structure can employ mechanical components such as valves or baffles; by changing the position of these components, the airflow path within the duct is altered. For example... Figure 1As shown in (a), when ventilation is required, the passage between the ventilation duct and the effective space is closed, the passage between the ventilation duct and the dust control duct is opened, and the passage between the dust control duct and the outside is closed simultaneously, allowing airflow to enter the dust control duct from the ventilation duct and then directly into the confined space; as shown in (a). Figure 1 As shown in (b), when dust control is required, the passage between the ventilation duct and the effective space is opened, the passage between the ventilation duct and the dust control duct is closed, and the passage between the dust control duct and the outside is opened, so that the airflow enters the confined space from the ventilation duct to ensure the ventilation needs of the workers for normal breathing. At the same time, the dust control duct generates negative pressure at the duct opening in the external environment, so that the airflow enters the dust control duct from the confined space, draws away the dust generated in the confined space, and discharges it to the outside, preventing the workers from inhaling dust.

[0020] It's worth noting that construction projects such as tunnels and subways generate significant amounts of dust. This device can effectively remove dust-laden airflow while providing fresh air for construction workers. In facilities like mines and storage tanks, regular ventilation is necessary to ensure the safety and health of workers. Certain industrial production processes also produce dust or harmful gases; this device can be used to control dust dispersion and remove harmful gases.

[0021] The dust control duct 2 is parallel to the ventilation duct 3; The connecting pipe 1 is perpendicular to the dust control pipe 2 and the ventilation pipe 3, respectively.

[0022] Furthermore, the connecting pipe is perpendicular to the dust control pipe and the ventilation pipe, which allows the airflow to change direction more smoothly when it enters the connecting pipe from the ventilation pipe and then enters the dust control pipe, reducing airflow resistance and improving ventilation efficiency.

[0023] The conversion structure includes a switching structure and an isolation structure; The switching structure is located outside the air supply duct, and the isolation structure is located inside the air supply duct. They are respectively located at the connection points of the dust control duct 2 and the ventilation duct 3 with the connecting duct 1, and are connected to the rotating shaft of the duct at the connection point. The switching structure is connected to the isolation structure and is used to adjust the position of the isolation structure to switch whether the airflow in the ventilation duct and the airflow between the ventilation duct 3 and the dust control duct 2 are flowing.

[0024] The switching structure includes a first rotating shaft 4, a second rotating shaft 5, and a connecting rod 6. The first rotating shaft 4 passes through the air supply pipe and is installed at the connection between the ventilation pipe 3 and the connecting pipe 1. The second rotating shaft 5 passes through the air supply pipe and is installed at the connection between the dust control pipe 2 and the connecting pipe 1. A first rotating mechanism 7 is provided at the end of the first rotating shaft 4, and a second rotating mechanism 8 is provided at the end of the second rotating shaft 5. The first rotating mechanism 7 and the second rotating mechanism 8 are connected by the connecting rod 6. The first rotating shaft 4 and the second rotating shaft 5 are connected to the isolation structure to realize the rotation of the isolation structure.

[0025] The isolation structure includes a first isolation plate 9 and a second isolation plate 10; The first isolation plate 9 is connected to the first rotating shaft 4 and is used to control the flow of the ventilation duct 3 to the confined space or the flow of the ventilation duct 3 to the dust control duct 2; The second isolation plate 10 is connected to the second rotating shaft 5 and is used to control the flow between the dust control pipe 2 and the outside or the flow from the ventilation pipe 1 to the dust control pipe 2.

[0026] Specifically, the conversion structure consists of a switching structure and an isolation structure, which work together to switch between the dust control duct and the ventilation duct. The switching structure is located outside the air supply duct, making it easy for operators to control and adjust from the outside; the isolation structure is located inside the air supply duct, directly acting on the airflow channel, and controlling the airflow direction by changing its position.

[0027] The first rotating shaft is installed at the connection between the ventilation duct and the connecting duct, specifically at the end of the ventilation duct closest to the confined space. This positioning allows the first rotating shaft to precisely respond to external operations, thereby driving the connected components to move and controlling the airflow within the ventilation duct and the airflow channel at the connection between the ventilation duct and the connecting duct. The second rotating shaft is installed at the connection between the dust control duct and the connecting duct, specifically at the end of the dust control duct closest to the external space. Its function is similar to the first connecting shaft, controlling the airflow at the connection between the dust control duct and the connecting duct (specifically, the air inlet of the ventilation duct) and the gas flow between the dust control duct and the outside environment.

[0028] When a force is applied to the first or second rotating mechanism to induce rotation, the two rotating shafts can be synchronously linked via a connecting rod. This can be achieved manually or electrically, simply by controlling the rotation of the first and second rotating shafts.

[0029] Furthermore, the isolation structure includes a first isolation plate 9 and a second isolation plate 10, which are respectively connected to a first rotating shaft 4 and a second rotating shaft 5. The position of the isolation plates is changed by rotating the shafts, thereby controlling the airflow direction. It is worth noting that the first isolation plate is fixedly connected to the first rotating shaft, and the connection between the second isolation plate and the second rotating shaft is also fixed. Alternatively, a hinged rotating shaft connection can be used, depending on the actual situation, to achieve the desired rotation effect.

[0030] When ventilation is needed in a confined space, such as Figure 1As shown in (a), the first isolation plate 9 rotates to a suitable position under the drive of the first rotating shaft 4, closing the channel between the rear end of the ventilation duct and the effective space. The second isolation plate 10 rotates under the drive of the second rotating shaft 5, closing the channel between the dust control duct and the external environment. At this time, the channel between the ventilation duct and the dust control duct is opened, allowing the airflow to smoothly enter the dust control duct from the ventilation duct and then enter the confined space.

[0031] When it is necessary to switch to dust control mode, the first isolation plate 9 and the second isolation plate 10 rotate to the corresponding positions, closing the channel between the connecting pipe and the dust control pipe, allowing airflow to directly enter the confined space from the ventilation pipe. At the same time, the dust control pipe opens for circulation, and the dust in the confined space flows to the external environment through the dust control pipe.

[0032] During operation, the operator applies force to the first rotating shaft 4 or the second rotating shaft 5 using an external operating device (such as a handle), causing it to rotate. The first rotating shaft 4 and the second rotating shaft 5 are linked by a connecting rod, simultaneously driving the first isolation plate 9 and the second isolation plate 10 connected to them to rotate. By precisely controlling the position of the isolation plates, the flow state between the dust control pipeline and the ventilation pipeline is switched. The first and second rotating shafts can be damping shafts to ensure the stability of the switching structure after rotation.

[0033] The main pipe 1, dust control pipe 2 and ventilation pipe 3 have the same diameter; The sizes of the first isolation plate 9 and the second isolation plate 10 are adapted to the diameters of the connecting pipe 1, the dust control pipe 2 and the ventilation pipe 3.

[0034] Specifically, the connecting pipe 1, dust control pipe 2, and ventilation pipe 3 have the same diameter, making the airflow characteristics in each pipe more stable. When switching airflow directions, there will be no significant airflow disturbance or pressure loss due to sudden changes in pipe diameter, ensuring the stability of ventilation and dust control effects. For example, when airflow flows from ventilation pipe 3 to the connecting pipe and then to dust control pipe 2, because the pipe diameter is the same, the airflow can enter the branch pipe at a relatively uniform speed and pressure, avoiding local airflow speeds that are too fast or too slow due to differences in pipe diameter, thereby improving airflow utilization efficiency.

[0035] The first isolation plate 9 and the second isolation plate 10 are sized to match the diameters of the connecting pipe 1, the dust control pipe 2, and the ventilation pipe 3, ensuring that the isolation plates can completely seal the pipes that do not need to be circulated when the airflow direction is switched. For example, when the ventilation pipe 3 needs to be closed, the first isolation plate 9 can fit tightly against the ventilation pipe 3 to prevent airflow from leaking into the effective space, thereby ensuring that the airflow can accurately flow to the dust control pipe 2 and improving the accuracy of ventilation and dust control.

[0036] The dust control pipe 2, which connects to the confined space, includes a retractable flexible pipe 11 and a rigid pipe 12 connected at the ends. The retractable flexible pipe 11 is used to avoid bending and blocking airflow.

[0037] Specifically, the expandable flexible tube can be of model WH00182. Since the structure of confined spaces is often irregular, containing various obstacles and irregular corners, the expandable flexible tube can bend and extend according to the actual space conditions, flexibly connecting with confined spaces and avoiding installation difficulties caused by the pipe's inability to adapt to the spatial layout. For example, in some underground tunnel construction, there may be various supporting structures and equipment inside the tunnel. The expandable flexible tube can easily bypass these obstacles while maintaining its inner diameter, ensuring effective communication with the confined space. Meanwhile, traditional rigid pipes are prone to excessive bending when bent, leading to a reduction in the pipe's inner diameter or even complete blockage, affecting the normal flow of air. The expandable flexible tube, with its good flexibility and plasticity, can maintain the unobstructed flow of the pipe during bending, without significantly reducing the cross-sectional area of ​​the airflow channel due to bending, thus ensuring that the dust-controlling airflow can smoothly enter the confined space, improving the dust control effect.

[0038] The retractable flexible tube 11 is mounted on the tail frame 13 of the conveyor belt via a first support member, and the rigid tube 12 is mounted on the bridge belt frame 14 via a second support member. The bridge belt frame 14 moves on the tail frame 13 of the conveyor belt via rollers 15 at its bottom, so that the rigid tube 12 moves closer to the retractable flexible tube, thus completing the extension and retraction of the retractable flexible tube 11.

[0039] The first support member includes a first support frame 16 fixed on the tail frame 13 of the conveyor belt. The crossbeam of the first support frame 16 is a guide rail 17 along the telescopic direction of the telescopic flexible tube 11. The telescopic flexible tube 11 is mounted on the guide rail 17 by a hanger 18. The second support member includes a second support frame 19 fixed on the bridge belt frame 14, and the rigid tube 12 is mounted on the second support frame 19; The horizontal height of the guide rail 17 on the first support frame 16 is higher than the horizontal height of the second support frame 19.

[0040] Specifically, such as Figure 2 , Figure 3 , Figure 4 As shown, the first support frame is installed on the tail frame of the conveyor belt, and the second support frame is installed on the bridge belt frame. The height of the second support frame is lower than the height of the air duct guide rail on the first support frame, so as to ensure that when the bridge belt frame moves back and forth on the tail frame of the conveyor belt, the second support frame fixed on the bridge belt frame will not touch the first support frame fixed on the tail frame of the conveyor belt.

[0041] The dust control duct has two states: extended and retracted, as shown below. Figure 2 , Figure 3 As shown. The positional relationship between the tail frame of the conveyor belt, the bridge belt frame, the first support frame, and the second support frame is as follows. Figure 4 As shown.

[0042] The above description is merely a few embodiments of this utility model and is not intended to limit this utility model in any way. Although this utility model has been disclosed above with preferred embodiments, it is not intended to limit this utility model. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this utility model using the disclosed technical content are equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A flow direction conversion device for a confined space air supply pipeline, characterized in that, include: Dust control pipeline (2), one end of the dust control pipeline (2) is connected to a confined space, and the other end of the dust control pipeline (2) is connected to the outside; Ventilation duct (3), the outlet end of which is connected to a confined space; Connecting pipe (1), the middle part of the ventilation pipe (3) is connected to the middle part of the dust control pipe (2) through connecting pipe (1); A switching structure is installed at the connection between the ventilation duct (3) and the connecting duct (1) and at the connection between the dust control duct (2) and the connecting duct (1). The switching structure is used to switch the flow of the ventilation duct (3) and the dust control duct (2), thereby realizing the switching of ventilation and dust removal flow direction.

2. The confined space air duct flow direction conversion device according to claim 1, characterized in that, The dust control duct (2) is parallel to the ventilation duct (3); The connecting pipe (1) is perpendicular to the dust control pipe (2) and the ventilation pipe (3), respectively.

3. The confined space air duct flow direction conversion device according to claim 1, characterized in that, The conversion structure includes a switching structure and an isolation structure; The switching structure is located outside the air supply duct, and the isolation structure is located inside the air supply duct. They are respectively located at the connection points of the dust control duct (2) and the ventilation duct (3) with the connecting duct (1), and are rotatably connected to the duct at the connection point. The switching structure is connected to the isolation structure and is used to adjust the position of the isolation structure to switch whether the airflow of the ventilation duct and the airflow of the ventilation duct (3) and the dust control duct (2) are flowing.

4. A confined space air duct flow direction conversion device according to claim 3, characterized in that, The switching structure includes a first rotating shaft (4), a second rotating shaft (5), and a connecting rod (6). The first rotating shaft (4) passes through the air supply pipe and is installed at the connection between the ventilation pipe (3) and the connecting pipe (1). The second rotating shaft (5) passes through the air supply pipe and is installed at the connection between the dust control pipe (2) and the connecting pipe (1). A first rotating mechanism (7) is provided at the end of the first rotating shaft (4), and a second rotating mechanism (8) is provided at the end of the second rotating shaft (5). The first rotating mechanism (7) and the second rotating mechanism (8) are connected by the connecting rod (6) to realize the synchronous rotation of the isolation structure. The first rotating shaft (4) and the second rotating shaft (5) are connected to the isolation structure to realize the rotation of the isolation structure.

5. A confined space air duct flow direction conversion device according to claim 4, characterized in that, The isolation structure includes a first isolation plate (9) and a second isolation plate (10); The first isolation plate (9) is connected to the first rotating shaft (4) and is used to control the flow of the ventilation duct (3) to the confined space or the flow of the ventilation duct (3) to the dust control duct (2); The second isolation plate (10) is connected to the second rotating shaft (5) and is used to control the flow between the dust control pipe (2) and the outside or the flow from the ventilation pipe (3) to the dust control pipe (2).

6. A confined space air duct flow direction conversion device according to claim 5, characterized in that, The diameters of the connecting pipe (1), the dust control pipe (2), and the ventilation pipe (3) are the same; The size of the first isolation plate (9) and the second isolation plate (10) is adapted to the diameter of the connecting pipe (1), the dust control pipe (2) and the ventilation pipe (3).

7. A confined space air duct flow direction conversion device according to claim 1, characterized in that, The dust control pipeline (2) includes a retractable flexible pipe (11) and a rigid pipe (12) connected at the end of the pipe on one side of the confined space. The retractable flexible pipe (11) is used to avoid bending and blocking the airflow.

8. A confined space air duct flow direction conversion device according to claim 7, characterized in that, The retractable flexible tube (11) is mounted on the tail frame (13) of the conveyor belt via a first support member, and the rigid tube (12) is mounted on the bridge belt frame (14) via a second support member. The bridge belt frame (14) moves on the tail frame (13) of the conveyor belt via rollers (15) at its bottom, so that the rigid tube (12) moves closer to the retractable flexible tube, thus completing the extension and retraction of the retractable flexible tube (11).

9. A confined space air duct flow direction conversion device according to claim 8, characterized in that, The first support member includes a first support frame (16) fixed on the tail frame (13) of the conveyor belt. The crossbeam of the first support frame (16) is a guide rail (17) along the telescopic direction of the telescopic flexible tube (11). The telescopic flexible tube (11) is mounted on the guide rail (17) by a hanger (18). The second support member includes a second support frame (19) fixed on the bridge belt frame (14), and the rigid tube (12) is mounted on the second support frame (19); The guide rail (17) on the first support frame (16) is at a higher horizontal height than the second support frame (19).

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