Manhole cable shaft ventilation and detection device

Abstract

This invention proposes a ventilation and detection device for manhole cable wells to solve the problem of air replacement in existing manhole cable wells. It includes an axial flow fan and an airbag. The airbag is arranged along the outer periphery of the axial flow fan, and several overlapping buckles are provided on the outer edge of the airbag. When the airbag is inflated to fill the well opening, the overlapping buckles overlap with the edge of the well opening. An air sensor is located at the bottom of the airbag. The airbag is transparent, and the information feedback surface of the air sensor is attached to the bottom of the transparent airbag. This invention uses an active mechanical exhaust method to replace the air in the well and has built-in air monitoring. It not only has good ventilation effect but also high ventilation efficiency, eliminating the need for long waiting times. The device's fixing method utilizes the expansion of the airbag to fill the well opening, making it suitable for manholes of different sizes. The dense filling effectively improves the mechanical exhaust effect, reducing the exhaust time.

Description

Technical Field

[0001] This utility model relates to a ventilation and detection device for manhole cable wells. Background Technology

[0002] Manhole cable wells are critical facilities for underground cable laying and maintenance, primarily used for personnel access, cable routing, and maintenance work. Due to their enclosed space, harmful gases can accumulate over time. Therefore, current technology typically involves opening the manhole cover for natural ventilation for a period before maintenance work begins. However, natural ventilation is not only ineffective and time-consuming, but it also fails to provide a clear view of the air quality inside the well, posing a certain risk to the life and health of maintenance personnel. Utility Model Content

[0003] To address the problem of polluted air replacement in existing manhole cable wells, this utility model proposes a ventilation and detection device for manhole cable wells, the specific technical contents of which are as follows:

[0004] This utility model discloses a ventilation and detection device for a manhole cable well, comprising an axial flow fan and an air bag. The air bag is arranged along the outer periphery of the axial flow fan, and a plurality of overlapping buckles are provided on the outer edge of the air bag. When the air bag is inflated to fill the well opening, the overlapping buckles overlap with the edge of the well opening. An air sensor is provided at the bottom of the air bag.

[0005] Preferably, the airbag is a transparent airbag, and the information feedback surface of the air sensor is attached to the bottom of the transparent airbag. The information feedback surface includes a display screen or an indicator light.

[0006] Preferably, the air sensor is connected to the display via a wiring harness.

[0007] Preferably, the fastener includes a connecting page fixed to the outer edge of the airbag, and a fastener connected to the connecting page and extending laterally outward.

[0008] Another type of ventilation and detection device for manhole cable wells according to this utility model includes a first axial flow fan, a second axial flow fan, a first airbag, and a second airbag. The first airbag is arranged along the outer periphery of the first axial flow fan, and the second airbag is arranged along the outer periphery of the second axial flow fan. A plurality of overlapping buckles are provided on the outer edges of the first airbag and the second airbag respectively. When the airbag is inflated to fill the well opening, the overlapping buckles overlap with the edge of the well opening. An air sensor is provided at the bottom of the first airbag and / or the second airbag. The air supply directions of the first axial flow fan and the second axial flow fan are opposite.

[0009] Preferably, the first airbag and the second airbag are both transparent airbags, and the information feedback surface of the air sensor is attached to the bottom of the transparent airbag. The information feedback surface includes a display screen or an indicator light.

[0010] Preferably, the air sensor is connected to the display via a wiring harness.

[0011] Preferably, the fastener includes a connecting page fixed to the outer edge of the airbag, and a fastener connected to the connecting page and extending laterally outward.

[0012] Compared with the prior art, the advantages of this utility model include:

[0013] 1) The active mechanical ventilation method is used to replace the air in the well. It not only has a good ventilation effect and can effectively protect the life safety of maintenance personnel going down the well, but also has high ventilation efficiency and does not require a long waiting time.

[0014] 2) The device is fixed by using an inflatable bladder to fill the manhole opening, which can be used for manholes of different sizes. The dense filling can effectively improve the mechanical ventilation effect and reduce the ventilation time.

[0015] 3) Equipped with air monitoring, it can detect and provide feedback on the air quality inside the well in real time, avoiding long waiting times for maintenance personnel due to uncertainty about whether the air inside the well has been replaced.

[0016] In summary, the outstanding features of this utility model are good adaptability, strong operability, low cost, good air replacement effect, and the ability to monitor the air quality inside the well in real time. Attached Figure Description

[0017] Figure 1 This is a top view of the structure of Embodiment 1 of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0019] Figure 3 This is a top view of the structure of Embodiment 2 of this utility model.

[0020] Figure 4 This is a cross-sectional structural diagram of Embodiment 2 of the present invention. Detailed Implementation

[0021] The following description, in conjunction with the accompanying drawings, further illustrates the proposed solution: Example

[0022] See appendix Figure 1 and 2A ventilation and detection device for a manhole cable well includes an axial flow fan 101 and an air bag 102. The air bag 102 is arranged along the outer periphery of the axial flow fan 101. Several overlapping buckles 103 are provided on the outer edge of the air bag 102. When the air bag 102 is inflated to fill the well opening 104, the overlapping buckles 103 overlap with the edge of the well opening 104. An air sensor 105 is provided at the bottom of the air bag 102.

[0023] Specifically, the airbag 102 is a transparent airbag, and the information feedback surface of the air sensor 105 is attached to the bottom of the transparent airbag. The information feedback surface includes a display screen or indicator light. The display screen is used to show the air quality value, while the indicator light may use red and green lights to indicate the air quality level. For example, a red light indicates poor air quality, and the well is filled with harmful gases, while a green light indicates good air quality, and it is safe to go down into the well for work. Maintenance personnel can observe the information feedback surface of the air sensor 105 through the airbag 102, thereby knowing the current air condition in the well and helping them determine when to go down into the well for work, avoiding long waiting times due to uncertainty about whether the air in the well has been replaced.

[0024] The lap buckle 103 includes a connecting page 103a fixed to the outer edge of the airbag 102, and a lap page 103b connected to the connecting page 103a and extending laterally outward.

[0025] When not in operation, the airbag 102 is in a deflated state for easy storage. When ventilation of the manhole cable well is required, the airbag 102 is first inflated with an external air source (e.g., an air pump or mouth air) to fill the gap between the well opening and the axial flow fan 101, thereby fixing the axial flow fan 101 to the well opening; at this time, the overlapping flap 103b of the overlapping buckle 103 can be placed on the edge of the well opening 104 to further prevent the device from falling into the well.

[0026] Manhole cable wells typically have two openings; this device can be installed on one of them. After installation, turning on the axial flow fan 101 (with an external power supply) will blow or exhaust air from the manhole, allowing air to enter through one opening and exit through the other, thus replacing stale air inside the well. This device uses an active mechanical ventilation method to replace the air inside the well, providing excellent ventilation and effectively ensuring the safety of personnel going down for maintenance. It also boasts high ventilation efficiency, eliminating the need for long waiting times. The device is secured by inflating an airbag to fill the manhole opening, making it suitable for manholes of different sizes. The dense filling effectively enhances the mechanical ventilation effect, reducing ventilation time. Example

[0027] See appendix Figure 3 and 4A ventilation and inspection device for a manhole cable well includes a first axial flow fan 201, a second axial flow fan 202, a first airbag 203, and a second airbag 204. The first airbag 203 is disposed along the outer periphery of the first axial flow fan 201, and the second airbag 204 is disposed along the outer periphery of the second axial flow fan 202. A plurality of overlapping buckles 205 are respectively provided on the outer edges of the first airbag 203 and the second airbag 204. When the airbags are inflated to fill the manhole opening 206, the overlapping buckles 205 overlap with the edge of the manhole opening 206. An air sensor 207 is provided at the bottom of the first airbag 203 and / or the second airbag 204. The air delivery directions of the first axial flow fan 201 and the second axial flow fan 202 are opposite. The first airbag 203 and the second airbag 204 are transparent airbags. The information feedback surface of the air sensor 207 is attached to the bottom of the transparent airbag. The information feedback surface includes a display screen or an indicator light. The fastening buckle 205 includes a connecting page 205a fixed to the outer edge of the airbag and a fastening page 205b connected to the connecting page 205a and extending laterally outward.

[0028] When not in operation, the first airbag 203 and the second airbag 204 are in a deflated state for easy storage. When ventilation of the manhole cable well is required, the first airbag 203 and the second airbag 204 are first inflated with an external air source (e.g., an air pump or mouth air) to fill the gap between the well opening and the axial flow fan, thereby fixing the axial flow fan to the well opening; at this time, the overlapping flap 205b of the overlapping buckle 205 can be placed on the edge of the well opening 206 to further prevent the device from falling into the well.

[0029] Manhole cable wells typically have two openings, with a first axial flow fan 201 and a second axial flow fan 202 fixed to each opening. After installation, turning on the first axial flow fan 201 and the second axial flow fan 202 (which are externally powered) will blow or exhaust air into the manhole, allowing air to enter through one opening and exit through the other, thus replacing the polluted air inside the well.

[0030] Compared with Example 1, the arrangement of two sets of axial flow fans in Example 2 can significantly improve the ventilation efficiency and minimize the ventilation waiting time.

[0031] As an alternative to Embodiments 1 and 2, the air sensors (105, 207) can also be connected to a display via a wiring harness. After installation, the display is located outside the well so that maintenance personnel can directly observe the air quality values, and the airbag does not necessarily need to be transparent.

[0032] As an extension, the external air source (air pump) and power supply can also be integrated into a controller, which provides an inflation interface and a power supply interface, etc., which will not be described in detail here.

[0033] The above preferred embodiments should be regarded as illustrative examples of the embodiments of the present application. Any technical deductions, substitutions, improvements, etc. that are similar to or based on the present application should be considered within the scope of protection of this patent.

Claims

1. A ventilation and detection device for manhole cable wells, characterized in that: The device includes an axial flow fan and an airbag. The airbag is arranged along the outer periphery of the axial flow fan. Several overlapping buckles are provided on the outer edge of the airbag. When the airbag is inflated to fill the wellhead, the overlapping buckles overlap with the edge of the wellhead. An air sensor is provided at the bottom of the airbag. The airbag is a transparent airbag. The information feedback surface of the air sensor is attached to the bottom of the transparent airbag. The information feedback surface includes a display screen or an indicator light.

2. The ventilation and detection device for manhole cable wells according to claim 1, characterized in that: The air sensor is connected to the display via a wiring harness.

3. The ventilation and detection device for manhole cable wells according to claim 1, characterized in that: The buckle includes a connecting page fixed to the outer edge of the airbag, and a buckle that is connected to the connecting page and extends laterally outward.

4. A ventilation and detection device for manhole cable wells, characterized in that: The device includes a first axial flow fan, a second axial flow fan, a first airbag, and a second airbag. The first airbag is disposed along the outer periphery of the first axial flow fan, and the second airbag is disposed along the outer periphery of the second axial flow fan. Several overlapping buckles are provided on the outer edges of the first and second airbags, which overlap with the edge of the wellhead when the airbags are inflated to fill it. An air sensor is provided at the bottom of the first and / or second airbags. The air delivery directions of the first and second axial flow fans are opposite. The first and second airbags are both transparent airbags. The information feedback surface of the air sensor is attached to the bottom of the transparent airbag, and the information feedback surface includes a display screen or indicator light.

5. The ventilation and detection device for manhole cable wells according to claim 4, characterized in that: The air sensor is connected to the display via a wiring harness.

6. The ventilation and detection device for manhole cable wells according to claim 4, characterized in that: The buckle includes a connecting page fixed to the outer edge of the airbag, and a buckle that is connected to the connecting page and extends laterally outward.

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