Multi-functional manhole ventilation system

Abstract

The utility model provides a kind of multifunctional inspection well ventilation system, including support frame, air inlet fan, air duct, detection tube, harmful gas detection unit and controller;The support frame is used to support and cover with inspection well mouth, the air inlet fan is set in support frame, the air duct is detachably set in support frame, and the air inlet end of air duct is opposite the air outlet side of air inlet fan, the air outlet end of air duct is placed in inspection well;The lower end of the detection tube extends into the inspection well, and the upper end of the detection tube is in communication with the harmful gas detection unit, the detection output end of the harmful gas detection unit is connected to the controller and outputs harmful gas concentration information to the controller, and the control output end of the controller is connected to the air inlet fan and controls the air inlet fan to work according to harmful gas concentration information.

Description

Technical Field

[0001] This utility model relates to a manhole ventilation system, and more particularly to a multifunctional manhole ventilation system. Background Technology

[0002] Underground utility tunnels, such as manholes, are often sealed. Over time, some harmful gases will be generated in the underground utility tunnels. If it is necessary to inspect the equipment in the underground utility tunnel, such as water pipes and cables, the manhole cover needs to be opened, then the tunnel needs to be ventilated before the staff can go down into the tunnel.

[0003] In existing technologies, ventilation of underground utility tunnels is generally achieved by using fans to draw in or supply air into the tunnel. However, existing technologies lack the ability to detect harmful gases in the manholes, and often rely on experience to determine whether to draw in or supply air. This approach has the following technical drawbacks: to completely bring the harmful gases in the tunnel to a safe level, a long time is required for drawing in or ventilating, which is inefficient and energy-intensive. Furthermore, the fan power is not adjustable, which can easily affect the lifespan of the fan. On the other hand, if ventilation is incomplete, a considerable concentration of harmful gases will remain in the tunnel, posing a serious safety hazard.

[0004] In addition, the existing ventilation equipment for manholes is too basic. For example, it cannot provide active warnings and requires additional cone-shaped warning devices, which makes it inconvenient to use.

[0005] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a multifunctional manhole ventilation system. When ventilating the pipe gallery in the manhole, the system can adjust the fan speed according to the concentration of harmful gases in the manhole, thereby enabling the fan to operate at a reasonable speed, effectively reducing energy consumption, and avoiding the situation where harmful gases are not completely discharged, thus reducing safety hazards. The entire system has a relatively simple structure and is easy to use. In addition, it is equipped with an active light-emitting warning unit that can adaptively adjust whether to issue a warning according to the ambient light, eliminating the need for additional warning devices.

[0007] This utility model provides a multifunctional manhole ventilation system, including a support frame, an air intake fan, an air duct, a detection tube, a harmful gas detection unit, and a controller;

[0008] The support frame is used to support and cover the manhole opening. The air intake fan is mounted on the support frame. The air guide pipe is detachably mounted on the support frame, with the air inlet end of the air guide pipe facing the air outlet end of the air intake fan. The air outlet end of the air guide pipe is placed inside the manhole. The lower end of the detection pipe extends into the manhole, and the upper end of the detection pipe is connected to the hazardous gas detection unit. The detection output end of the hazardous gas detection unit is connected to the controller and outputs hazardous gas concentration information to the controller. The control output end of the controller is connected to the air intake fan and controls the operation of the air intake fan according to the hazardous gas concentration information.

[0009] The support frame is also equipped with a warning post, which is connected to the support frame by a damping hinge. The outer wall of the warning post is equipped with a reflective strip, and the warning post is equipped with an active light-emitting unit.

[0010] Furthermore, the harmful gas detection unit includes an intake fan, a detection chamber, and a sensor unit;

[0011] The suction fan is located at the air inlet of the detection chamber. The upper end of the detection tube is connected to the air inlet of the detection chamber. A dehumidifying filter is provided in the front chamber of the detection chamber. The suction fan is located between the air inlet and the dehumidifying filter. The front chamber of the detection chamber is also provided with several staggered baffles located behind the dehumidifying filter. The sensor unit is located in the rear chamber of the detection chamber. A humidity sensor is also provided between the dehumidifying filter and the air inlet. The output terminals of the humidity sensor and the sensor unit are connected to the controller. The control terminal of the suction fan is connected to the controller.

[0012] Furthermore, the air duct is a flexible telescopic air duct, with a support ring fixedly installed at the upper end of the air duct, a connecting part fixedly installed on the outer side of the support ring, a hook installed on the connecting part, the hook being threadedly connected to the connecting part, and the hook being hooked onto the support frame.

[0013] Furthermore, the support frame is a grid structure composed of multiple crossbeams and longitudinal beams, wherein the two crossbeams in the middle of the support frame are provided with sliding grooves;

[0014] The intake fan is fixedly provided with a tubular housing, and the intake fan is disposed inside the housing. A connecting lug is fixedly provided on the outer wall of the housing. The connecting lug has a connecting hole, and the connecting lug is fixedly connected to the crossbeam by bolts passing through the connecting hole and the slide groove.

[0015] Furthermore, the active light-emitting unit includes a photoresistor RDL, an LED lamp, and an LED control circuit;

[0016] The photoresistor RDL is used to sense the ambient light outside the manhole and output a sensing signal to the LED control circuit. The LED control circuit controls the power supply circuit of the LED lamp to be turned on when the ambient light is less than a set threshold.

[0017] Furthermore, the LED control circuit includes resistors R1, R2, R3, R4, R5, and R6, transistor Q1, and comparator U7.

[0018] One end of resistor R1 is grounded, and the other end is connected to power supply VCC through photoresistor RDL. The common connection point between resistor R1 and photoresistor RDL is connected to the non-inverting input of comparator U7 through resistor R4. One end of resistor R2 is connected to power supply VCC, and the other end of resistor R2 is grounded through resistor R3. The common connection point between resistors R2 and R3 is connected to the inverting input of comparator U7. The inverting input of comparator U7 is grounded through capacitor C1. The output of comparator U7 is connected to the base of transistor Q1 through resistor R6. The emitter of transistor Q1 is connected to the LED. The collector of transistor Q1 is connected to power supply VCC through resistor R5.

[0019] Furthermore, the support frame is fixedly equipped with anti-slip nails.

[0020] The beneficial effects of this utility model are as follows: When ventilating the pipe gallery in the manhole, the fan speed can be adjusted according to the concentration of harmful gases in the manhole, so that the fan can work at a reasonable speed, effectively reducing energy consumption. It can also avoid the situation where harmful gases are not completely discharged, reducing safety hazards. The entire system structure is relatively simple and easy to use. In addition, it is equipped with an active light-emitting warning unit, which can adaptively adjust whether to issue a warning according to the ambient light, without the need for additional warning equipment. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a top view of the bracket of this utility model.

[0024] Figure 3 This is a schematic diagram of the hazardous gas detection unit.

[0025] Figure 4 This is a schematic diagram of the electrical structure of this utility model.

[0026] Figure 5 This is a schematic diagram of the LED control circuit structure of this utility model. Detailed Implementation

[0027] The present invention will be further described in detail below:

[0028] This utility model provides a multifunctional manhole ventilation system, including a support frame 9, an air intake fan 12, an air duct 8, a detection tube 7, a harmful gas detection unit, and a controller;

[0029] The support frame 9 is used to support and cover the manhole opening. The air intake fan 12 is mounted on the support frame. The air guide pipe 8 is detachably mounted on the support frame, with the air inlet end of the air guide pipe 8 facing the air outlet end of the air intake fan. The air outlet end of the air guide pipe is placed inside the manhole. The lower end of the detection pipe extends into the manhole, and the upper end of the detection pipe is connected to the hazardous gas detection unit. The detection output end of the hazardous gas detection unit is connected to the controller and outputs hazardous gas concentration information to the controller. The control output end of the controller is connected to the air intake fan and controls the operation of the air intake fan according to the hazardous gas concentration information.

[0030] The support frame is also equipped with a warning post 3, which is connected to the support frame via a damping hinge. A reflective strip 31 is provided on the outer wall of the warning post 3, and an active light-emitting unit is installed inside the warning post. Through this structure, when ventilating the pipe gallery inside the manhole, the fan speed can be adjusted according to the concentration of harmful gases in the manhole, thereby ensuring the fan operates at a reasonable speed, effectively reducing energy consumption, and preventing incomplete removal of harmful gases, thus reducing safety hazards. Furthermore, the entire system structure is relatively simple and easy to use. It also features an active light-emitting warning unit that can adaptively adjust the warning based on ambient light, eliminating the need for additional warning equipment. The attached diagram shows the folding method of the warning post; in field use, the warning post can be made vertical, and due to the damping hinge, no other structural support is required when it is vertical.

[0031] In this embodiment, the harmful gas detection unit includes an intake fan 15, a detection chamber 6, and a sensor unit 16;

[0032] The suction fan 15 is located at the air inlet of the detection chamber 6. The upper end of the detection tube 7 is connected to the air inlet of the detection chamber. A dehumidifying filter 17 is provided in the front chamber of the detection chamber 6. The suction fan 15 is located between the air inlet and the dehumidifying filter 17. Several staggered baffles 14 are also provided in the front chamber of the detection chamber 6, and the baffles 14 are located behind the dehumidifying filter. Of course, the width of the baffles is smaller than the width of the detection chamber. The sensor unit is located in the rear chamber of the detection chamber. A humidity sensor is also provided between the dehumidifying filter and the air inlet. The output terminals of the humidity sensor and the sensor unit are connected to the controller. The control terminal of the suction fan is connected to the controller, so that the controller controls the suction fan to work. In use, the suction fan works first to draw in the corresponding gas to be tested, which is detected by the gas sensor. The controller then looks up a pre-determined concentration-speed table based on the concentration of the harmful gas to determine the speed of the suction fan. In the above structure, after the intake fan draws in the gas to be measured, the air is dehumidified and filtered by the initial filter to prevent excessive humidity from damaging the subsequent sensor units. More importantly, excessive humidity can reduce the detection sensitivity of the sensor units, thus preventing inaccurate detection results. Furthermore, the baffle plate prevents excessively fast gas flow from reducing detection accuracy. The sensor units utilize existing sensor combinations, including carbon monoxide sensors, carbon dioxide sensors, methane sensors, sulfur dioxide sensors, etc. The front and rear in the above description are represented by left and right in the diagram, with left indicating front and right indicating rear.

[0033] In this embodiment, the air duct 8 is a flexible telescopic air duct. A support ring 11 is fixedly installed at the upper end of the air duct, and a connecting part 5 is fixedly installed on the outer side of the support ring. The connecting part is provided with a hook 2, which is threadedly connected to the connecting part 5 and hooked onto the support frame. The support ring supports the air duct, ensuring that the cross-sectional area of ​​the air inlet is greater than or equal to the area of ​​the air intake fan housing, thus ensuring effective air delivery. It also facilitates the fixed installation of the connecting part. The connecting part and the support ring can be fixed by welding, and the hook connection facilitates easy assembly and disassembly. Generally, the hooks and connecting parts are arranged in two sets, symmetrically on the support ring, such as... Figure 1 As shown.

[0034] In this embodiment, the support frame 9 is a grid structure composed of multiple crossbeams and longitudinal beams, wherein two crossbeams in the middle of the support frame are provided with sliding grooves 10;

[0035] The intake fan 12 is fixedly mounted on a tubular housing 1, with the intake fan housed inside the housing 1. A connecting lug 101 is fixedly mounted on the outer wall of the housing 1. The connecting lug 101 has a connecting hole, and the connecting lug is fixedly connected to the crossbeam by bolts passing through the connecting hole and the sliding groove. The grille structure eliminates the need for separate openings, facilitating fan air delivery and reducing the overall weight of the support frame. The sliding groove and connecting lug structure facilitate fixing the housing to the support frame. Furthermore, the housing and the fan are fixedly connected by a connecting rod 13 (existing technology), ensuring that the axis of the housing is collinear with the rotation axis of the fan.

[0036] In this embodiment, the active light-emitting unit includes a photoresistor RDL, an LED lamp, and an LED control circuit;

[0037] The photoresistor RDL is used to sense the ambient light outside the manhole and output a sensing signal to the LED control circuit. The LED control circuit controls the power supply circuit of the LED lamp to be turned on when the ambient light is less than a set threshold.

[0038] Specifically: the LED control circuit includes resistors R1, R2, R3, R4, R5, and R6, transistor Q1, and comparator U7;

[0039] One end of resistor R1 is grounded, and the other end is connected to the power supply VCC through a photoresistor RDL. The common connection point between resistor R1 and photoresistor RDL is connected to the non-inverting input of comparator U7 through resistor R4. One end of resistor R2 is connected to the power supply VCC, and the other end of resistor R2 is grounded through resistor R3. The common connection point between resistors R2 and R3 is connected to the inverting input of comparator U7. The inverting input of comparator U7 is grounded through capacitor C1. The output of comparator U7 is connected to the base of transistor Q1 through resistor R6. The emitter of transistor Q1 is connected to an LED, and the collector of transistor Q1 is connected to the power supply VCC through resistor R5. This structure allows for adaptive sensing of ambient light, providing a warning without manual adjustment. When the ambient light is strong, comparator U1 outputs a low level, and transistor Q1 is cut off. When the ambient light is dim, below a set value, comparator U1 outputs a high level, transistor Q1 conducts, and the LED illuminates as a warning.

[0040] In this embodiment, the support frame is fixedly equipped with anti-slip nails 14. The anti-slip nails prevent the support frame from sliding off the edge of the manhole due to vibrations during the operation of the air intake fan, thus improving stability during use.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multifunctional manhole ventilation system, characterized in that: Includes support frame, air intake fan, air duct, detection tube, hazardous gas detection unit and controller; The support frame is used to support and cover the manhole opening. The air intake fan is mounted on the support frame. The air guide pipe is detachably mounted on the support frame, with the air inlet end of the air guide pipe facing the air outlet end of the air intake fan. The air outlet end of the air guide pipe is placed inside the manhole. The lower end of the detection pipe extends into the manhole, and the upper end of the detection pipe is connected to the hazardous gas detection unit. The detection output end of the hazardous gas detection unit is connected to the controller and outputs hazardous gas concentration information to the controller. The control output end of the controller is connected to the air intake fan and controls the operation of the air intake fan according to the hazardous gas concentration information. The support frame is also equipped with a warning post, which is connected to the support frame by a damping hinge. The outer wall of the warning post is equipped with a reflective strip, and the warning post is equipped with an active light-emitting unit.

2. The multifunctional manhole ventilation system according to claim 1, characterized in that: The harmful gas detection unit includes an intake fan, a detection chamber, and a sensor unit; The suction fan is located at the air inlet of the detection chamber. The upper end of the detection tube is connected to the air inlet of the detection chamber. A dehumidifying filter is provided in the front chamber of the detection chamber. The suction fan is located between the air inlet and the dehumidifying filter. The front chamber of the detection chamber is also provided with several staggered baffles located behind the dehumidifying filter. The sensor unit is located in the rear chamber of the detection chamber. A humidity sensor is also provided between the dehumidifying filter and the air inlet. The output terminals of the humidity sensor and the sensor unit are connected to the controller. The control terminal of the suction fan is connected to the controller.

3. The multifunctional manhole ventilation system according to claim 1, characterized in that: The air duct is a flexible telescopic air duct. A support ring is fixedly installed at the upper end of the air duct. A connecting part is fixedly installed on the outside of the support ring. A hook is provided on the connecting part. The hook is threadedly connected to the connecting part and is hooked to the support frame.

4. The multifunctional manhole ventilation system according to claim 1, characterized in that: The support frame is a grid structure composed of multiple crossbeams and longitudinal beams, wherein the two crossbeams in the middle of the support frame are provided with sliding grooves. The intake fan is fixedly provided with a tubular housing, and the intake fan is disposed inside the housing. A connecting lug is fixedly provided on the outer wall of the housing. The connecting lug has a connecting hole, and the connecting lug is fixedly connected to the crossbeam by bolts passing through the connecting hole and the slide groove.

5. The multifunctional manhole ventilation system according to claim 1, characterized in that: The active light-emitting unit includes a photoresistor RDL, an LED lamp, and an LED control circuit. The photoresistor RDL is used to sense the ambient light outside the manhole and output a sensing signal to the LED control circuit. The LED control circuit controls the power supply circuit of the LED lamp to be turned on when the ambient light is less than a set threshold.

6. The multifunctional manhole ventilation system according to claim 5, characterized in that: The LED control circuit includes resistors R1, R2, R3, R4, R5, and R6, transistor Q1, and comparator U7. One end of resistor R1 is grounded, and the other end is connected to power supply VCC through photoresistor RDL. The common connection point between resistor R1 and photoresistor RDL is connected to the non-inverting input of comparator U7 through resistor R4. One end of resistor R2 is connected to power supply VCC, and the other end of resistor R2 is grounded through resistor R3. The common connection point between resistors R2 and R3 is connected to the inverting input of comparator U7. The inverting input of comparator U7 is grounded through capacitor C1. The output of comparator U7 is connected to the base of transistor Q1 through resistor R6. The emitter of transistor Q1 is connected to the LED. The collector of transistor Q1 is connected to power supply VCC through resistor R5.

7. The multifunctional manhole ventilation system according to claim 1, characterized in that: The support frame is fixedly equipped with anti-slip nails.

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