Well lid exhaust device and well lid structure comprising same

Abstract

The utility model discloses a manhole cover exhaust device and a manhole cover structure comprising the same, the manhole cover exhaust device comprises a duct, a fan blade driven by a motor is arranged in the duct, a control box is arranged outside the duct, the control box adopts a timing control module to control the motor to start and stop at fixed time according to stored time information, the start and stop time is stable, and the service life of the motor is prolonged. Reasonable setting can be carried out according to living habits of residents in an area where the well lid is located, so that the exhaust time avoids a time period with large resident activity; according to the well lid structure, the device is connected with a well lid through a duct, the well lid is slightly changed, and use is convenient; the duct and the fan blades are made of stainless steel, the motor is a waterproof brushless motor, the control box is made of plastic materials and is sealed, only a Bluetooth module and a timing control module are needed in the control box, cost is low, stability and reliability are achieved, and the well lid exhaust device can effectively solve the problems that an existing well lid exhaust device is poor in reliability and unreasonable in exhaust time. And the safety of the sewer and the living environment of residents are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sewer ventilation, and particularly relates to a well lid exhaust device and a well lid structure comprising the device. BACKGROUND

[0002] A sewer is an underground passage for discharging and diverting sewage and rainwater. A manhole is provided on the sewer at intervals to extend to the ground, so as to maintain and regularly dredge the sewer to ensure that the sewer remains unobstructed. To prevent pedestrians, vehicles or objects from falling into or from the manhole, a well lid seat is provided at the manhole and is closed by a well lid. Since the space of the sewer is relatively closed and the oxygen content is low, the sewage and pollutants in the sewer contain a variety of organic matter that can easily ferment to produce methane gas. This not only increases the gas pressure in the sewer, but also causes the combustible gases such as methane, carbon monoxide, hydrogen and ammonia in the methane gas to explode when the concentration of the combustible gases reaches a certain value, for example, when firecrackers are set off or cigarettes are thrown on the well lid. The explosion of the sewer can easily cause harm to pedestrians and buildings around and pose a great threat to social safety.

[0003] Traditional well lids rely on their own drainage holes for natural ventilation and have no active ventilation measures. The ability of the sewer to exchange gas with the outside world is weak, and combustible gases in the sewer can easily accumulate rapidly, making it more likely to explode and less safe. There are also well lids with active ventilation devices installed based on the drainage holes of traditional well lids, such as the automatic exhaust sewer well lid disclosed in Chinese patent CN114960910A. The exhaust device of this scheme uses the downward pressure of pedestrians and vehicles on the well lid as the driving force to actively ventilate the fan blades. However, this scheme not only has a complex structure, but also has poor stability and is greatly affected by the time and effect of ventilation by the flow of people and vehicles. With the continuous progress of technology, some well lids have also applied emerging technologies such as sensors and the Internet of Things. For example, the sewer safety explosion-proof automatic exhaust well lid disclosed in Chinese patent CN210140849U and the sewer well lid with a variable frequency pulse air supply device disclosed in Chinese patent CN116084540A. The exhaust device of the well lid in these two schemes mainly includes a gas detector arranged below the well lid and fan blades driven by a motor. When the gas detector detects that the concentration of combustible gas exceeds the standard, the motor drives the fan blades to actively ventilate. However, in these two schemes, the semiconductor elements used for detection on the gas detector need to be exposed to the gas environment of the sewer, and the gas detector is easily eroded by the gas and fails due to water ingress and soaking. The stability and reliability are poor. In addition, the exhaust time determined by the concentration of combustible gas is likely to conflict with the time of residents' daytime activities. The emission of smelly methane gas to the ground during the day can have a great impact on residents' lives.

[0004] Therefore, it is necessary to design a manhole cover venting device that is stable, reliable, and has a reasonable venting time to improve the safety of sewers and ensure a good living environment for residents. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a manhole cover venting device and a manhole cover structure containing the device, so as to solve the technical problems of poor reliability and unreasonable venting time of existing manhole cover venting devices, and achieve the effect of improving the safety of sewers and improving the living environment.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A manhole cover venting device includes a duct for installation under the manhole cover. A motor is fixedly installed inside the duct, and the motor drives a fan blade located inside the duct and coaxial with the duct. A sealed control box is fixedly installed outside the duct. The control box contains a power module, a wireless communication module, and a timing control module. The timing control module is electrically connected to the power module, the wireless communication module, and the motor. The timing control module is used to control the start and stop of the motor according to its stored time information. The power module is used to supply power, and the wireless communication module is used to communicate with external devices and adjust the time information.

[0008] Furthermore, the duct has an air inlet and an air outlet at its two axial ends. The air inlet is used to connect with the manhole cover, and the motor drives the fan blades to generate airflow from the air inlet to the air outlet.

[0009] Furthermore, the inner diameter of the air outlet is smaller than the inner diameter of the air inlet.

[0010] Furthermore, the duct includes an installation section and a flow stabilization section. The motor and fan blades are located inside the installation section. The inner diameter of the installation section is larger than the inner diameter of the flow stabilization section. The installation section and the flow stabilization section are connected by a guide section with a tapered inner diameter. The free end of the installation section is the air inlet end, and the free end of the flow stabilization section is the air outlet end.

[0011] Furthermore, the motor is coaxially mounted on the side of the fan blade near the air inlet, and a conical baffle with its tip facing the air inlet is coaxially mounted on the side of the motor near the air inlet. The conical baffle is located inside the duct and its diameter is larger than that of the motor.

[0012] Furthermore, the duct and fan blades are made of stainless steel, the control box is made of plastic and is sealed on the outer wall of the duct, and the power module, wireless communication module and timing control module are installed on the outer wall of the duct at intervals through heat-conducting elements.

[0013] Furthermore, temperature sensors electrically connected to the timing control module are installed in both the motor and the control box.

[0014] Further, the wireless communication module is a Bluetooth module, and the timing control module is a single-chip microcomputer.

[0015] The utility model also includes a well lid structure, the well lid structure includes well lid and well lid exhaust device as described above, well lid is equipped with the multiple air inlet hole of circular distribution is close to the middle part, is equipped with the multiple air outlet hole of circular distribution is close to the edge, culvert is connected below well lid and the air inlet end is with well lid lower surface abutment, air inlet hole is located culvert inside, and air outlet hole is located culvert outside.

[0016] Further, the well lid lower surface is convexly formed with an annular positioning portion, the air inlet end is located inside the positioning portion, and an outer diameter of the air inlet end matches an inner diameter of the positioning portion, a connecting lug is convexly formed on an outer side surface of the culvert, and the well lid is connected with the connecting lug through an axially arranged counterbore bolt to fix the culvert.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The well lid exhaust device, which uses a timing control module to control the start and stop of a motor according to stored time information, has stable start and stop time of the motor, and can be flexibly set according to the living habits of residents in the area where the well lid is located, so that the exhaust time is avoided during a period of time when the residents are active, which is conducive to reducing the influence of exhaust odor on the residents' life, effectively solving the problems of poor reliability and unreasonable exhaust time of the existing well lid exhaust device, and improving the safety of the sewer and the living environment of the residents.

[0019] 2. The well lid exhaust device, which uses stainless steel for the culvert and the fan blade due to good corrosion resistance and structural strength, uses a waterproof brushless motor for the motor, and only needs a Bluetooth module and a timing control module for the control part, has low cost, is conducive to saving expenses while ensuring the safety of municipal biogas, uses plastic material for the control box and performs sealing treatment at the wiring position, is not eroded by environmental gas and fails due to water ingress and soaking, can ensure that the well lid exhaust device can be safely operated for more than ten years, and has good stability and reliability.

[0020] 3. The well lid exhaust device, which is connected together with the well lid through the culvert, is more convenient for opening and checking, uses two rings of drain holes of the well lid itself as air inlet holes and air outlet holes, has small changes to the well lid, and is convenient to implement and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the well lid exhaust device described in the embodiments;

[0022] Figure 2A plan view of the well lid exhaust device according to the embodiment;

[0023] Figure 3 For Figure 2 A cross-sectional view along A-A;

[0024] Figure 4 A perspective view of the well lid exhaust device according to the embodiment (with the conical baffle hidden);

[0025] Figure 5 A bottom view of the well lid exhaust device according to the embodiment (with the conical baffle hidden);

[0026] Figure 6 A wiring schematic of the well lid exhaust device according to the embodiment;

[0027] Figure 7 A perspective view of the well lid according to the embodiment;

[0028] Figure 8 A perspective view B of the well lid structure according to the embodiment;

[0029] Figure 9 A perspective view C of the well lid structure according to the embodiment;

[0030] Figure 10 A working state schematic of the well lid structure for a sewer well according to the embodiment;

[0031] Wherein, the well lid 1, the culvert 2, the motor 3, the fan blade 4, the control box 5, the power module 6, the wireless communication module 7, the timing control module 8, the external device 9, the sewer 10, the well lid seat 11, the air inlet end 12, the air outlet end 13, the mounting section 14, the flow stabilizing section 15, the guide section 16, the connecting plate 17, the connecting rod 18, the first bolt 19, the conical baffle 20, the connecting column 21, the temperature sensor 22, the Bluetooth module 23, the single-chip microcomputer 24, the air inlet hole 25, the air outlet hole 26, the connecting lug 27, the second bolt 28, the positioning part 29. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0033] Embodiment:

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 , a well lid exhaust device, comprising a culvert 2 for being installed below a well lid 1, a motor 3 is fixedly arranged inside the culvert 2, the motor 3 has a spacing with the inner wall of the culvert 2, and the motor 3 is drivingly connected with a fan blade 4 which is located inside the culvert 2 and coaxial with the culvert 2; please refer toFigure 5 and Figure 6 The sealed control box 5 is fixed outside the culvert 2, and the control box 5 is internally provided with a power module 6, a wireless communication module 7 and a timing control module 8; the timing control module 8 is electrically connected with the power module 6, the wireless communication module 7 and the motor 3 respectively, and is used for controlling the motor 3 to start and stop according to time information stored by the timing control module 8; the power module 6 is used for power supply; and the wireless communication module 7 is used for communicating with an external device 9 and adjusting the time information; in the embodiment, the power module 6 supplies power to the well lid exhaust device through external power supply; in the implementation, the power module 6 can also supply power in the form of a storage battery and periodical replacement or connection of a solar cell panel, or power supply through an external power supply after voltage reduction.

[0035] In use, the culvert 2 is installed below the well lid 1; the external device 9 (such as a mobile phone and a notebook computer) is operated by a staff to communicate with the well lid exhaust device through the wireless communication module 7; the time information is set or modified according to requirements; then the timing control module 8 controls the motor 3 to start and stop at a corresponding time according to the time information; and the motor 3 drives the fan blade 4 to generate airflow in the culvert 2 and cooperates with the drain hole on the well lid 1 to complete the sewer 10 exhaust.

[0036] In the well lid exhaust device, the culvert 2 not only serves as an airflow channel and plays a role of separating inlet airflow and outlet airflow and improving exhaust effect, but also serves as an installation carrier of the motor 3, the control box 5 and other components independent of the well lid 1, so that the well lid exhaust device can be integrally added to an existing well lid without replacing the well lid, and the use cost is reduced; compared with the existing well lid exhaust device which controls the motor 3 to start and stop according to the combustible gas concentration through a gas detector, the well lid exhaust device controls the motor 3 to start and stop at a timing according to the stored time information through the timing control module 8, so that the start and stop time of the motor 3 is stable, and the exhaust time can be flexibly set according to the living habits of residents in the area where the well lid 1 is located, so that the exhaust odor is avoided during a period of time when the residents are active, for example, the time information is set to control the motor 3 to continuously or intermittently work from 2 o'clock to 5 o'clock in the morning, which can be timed operation every day or operation in a certain period of time every week, so that the influence of the exhaust odor on the residents' life can be effectively reduced; in addition, all the electronic modules are located in the sealed control box 5, and will not be corroded by environmental gas and fail due to water inflow and soaking, so that the stability and reliability are good; therefore, the well lid exhaust device can effectively solve the problems of poor reliability and unreasonable exhaust time of the existing well lid exhaust device, and is beneficial to improving the sewer safety and improving the living environment of the residents.

[0037] Please refer to Figure 1 and Figure 9, the air duct 2 has an air inlet end 12 and an air outlet end 13 at two axial ends respectively, the air inlet end 12 is used for connecting with the manhole cover 1, and the motor 3 drives the fan blade 4 to generate air flow from the air inlet end 12 to the air outlet end 13; in this way, the manhole cover exhaust device sends air into the downpipe 10 when operating, not only makes external air enter the downpipe 10 to mix with the combustible gas and reduce the concentration of the combustible gas, but also forms a circulating air flow to make the combustible gas continuously discharge through the drain hole on the manhole cover 1, compared with the air extraction at the wellhead, the manhole cover exhaust device sends air into the downpipe 10 to form an air flow circulation directly at the manhole cover 1, and the effect of exhaust and ventilation of the downpipe 10 is better.

[0038] Please refer to Figure 1 and Figure 3 , the inner diameter of the air outlet end 13 is smaller than that of the air inlet end 12; in this way, when the air flow generated by the rotation of the fan blade 4 flows from the air inlet end 12 to the air outlet end 13, the air flow will be accelerated due to the contraction of the inner diameter of the air duct 2, so that the air inlet flow can more concentratedly rush to the deep part of the downpipe 10, which is beneficial to improve the dilution effect of the combustible gas in the downpipe 10, form an effective air flow circulation between the deep part of the downpipe 10 and the outside world, and thus improve the exhaust effect.

[0039] Please refer to Figure 1 and Figure 3 , specifically, in the embodiment, the air duct 2 includes a mounting section 14 and a flow stabilizing section 15, the inner diameter of the mounting section 14 is greater than that of the flow stabilizing section 15, the mounting section 14 and the flow stabilizing section 15 are connected through a guide section 16 with a tapered inner diameter, the free end of the mounting section 14 is the air inlet end 12, the free end of the flow stabilizing section 15 is the air outlet end 13, the motor 3 and the fan blade 4 are located inside the mounting section 14, a connecting plate 17 is arranged inside the mounting section 14, the connecting plate 17 is connected with the inner wall of the air duct 2 through a plurality of radially extending connecting rods 18 around the connecting plate 17, and the motor 3 is connected with the connecting plate 17 through a first bolt 19 arranged in the axial direction; in this way, the mounting section 14 is used for mounting and fixing the motor 3 and the control box 5, and provides a large amount of air at the same time, the guide section 16 is used for guiding the air flow to gather and accelerate, and the flow stabilizing section 15 is used for restraining the fast air flow after gathering to make the air flow stably rush to the deep part of the downpipe 10.

[0040] Please refer to Figure 1 , Figure 3 and Figure 4, the motor 3 is coaxially arranged on one side of the fan blade 4 close to the air inlet end 12, the connecting plate 17 is located on one side of the motor 3 close to the air inlet end 12, and the motor 3 is coaxially provided with a conical baffle 20 with a sharp end facing the air inlet end 12 on the side close to the air inlet end 12. The inner side of the conical baffle 20 is provided with a connecting column 21 in the axial direction, the connecting column 21 is threadedly connected with the connecting plate 17, and the conical baffle 20 is located in the duct 2 and has a diameter larger than that of the motor 3. In this way, since the sewage at the wellhead can flow into the sewer 10 through the drain hole on the well cover 1, and the shaft end of the motor 3 is downward during installation and use, the possibility of sewage entering the motor 3 from the gap of the motor shaft is reduced, which is beneficial to improve the waterproof effect of the motor 3 and make the well cover exhaust device more stable and reliable. The falling debris from the drain hole of the well cover 1 falls on the conical baffle 20 and slides from the edge of the conical baffle 20, so that the falling debris is away from the connection between the motor shaft and the fan blade 4, thereby reducing the possibility of debris winding around the motor shaft and damaging the connection. In addition, the motor 3 adopts a waterproof brushless motor 3, so even if the sewer 10 is flooded to the wellhead during the flood season and the well cover exhaust device is submerged, it will not be damaged, making the well cover exhaust device more stable and reliable.

[0041] In the embodiment, the duct 2 and the fan blade 4 are made of stainless steel, the control box 5 is made of plastic and is sealed and covered on the outer side wall of the duct 2, and the power module 6, the wireless communication module 7 and the timing control module 8 are in abutment with the outer side wall of the duct 2 through heat-conducting elements. In this way, the duct 2 and the fan blade 4 are made of stainless steel, which can effectively reduce the possibility of corrosion damage while ensuring the structural strength. The control box 5 is made of plastic, which is not only corrosion-resistant and waterproof, but also helps to reduce the overall weight. When the well cover exhaust device is running, the electronic modules in the control box 5 transfer heat to the duct 2 through the heat-conducting elements, and the heat of the duct 2 is carried away by the airflow inside the duct 2, thereby avoiding overheating of the control box 5 and improving the stability of the well cover exhaust device.

[0042] In the embodiment, temperature sensors 22 are respectively arranged in the motor 3 and the control box 5 and electrically connected with the timing control module 8. In this way, a temperature threshold can be preset in the timing control module 8. When the temperature sensor 22 detects that the temperature in the motor 3 or the control box 5 exceeds the threshold, the machine is stopped to prevent overheating and burning, and to prevent the biogas from burning, so that the well cover exhaust device can be stably operated for a long time.

[0043] In implementation, the wireless communication module 7 can adopt a 4G communication module, a 5G communication module, a wifi communication module and a Bluetooth module 23, etc. Since the well cover exhaust device usually only needs to set the time information once after installation, such as performing exhaust at intervals for several time periods in the early morning, the requirements for the communication distance and speed of the wireless communication module 7 are low, therefore, like Figure 6As shown, in the embodiment, the wireless communication module 7 adopts a Bluetooth module 23, after installation, the staff can communicate with the well lid exhaust device through the Bluetooth module 23 by a mobile phone or a notebook computer and the like, set time information, which is beneficial to reduce cost and operating power consumption; in addition, in the embodiment, the timing control module 8 adopts a single-chip microcomputer 24, the single-chip microcomputer 24 is a microcomputer system integrated with a processor, an input / output interface, a memory and a timer and the like, which can better meet the control requirements of the well lid exhaust device, and has low cost, small size and low power consumption.

[0044] Please refer to Figure 7 , Figure 8 and Figure 9 , in order to further understand the well lid exhaust device, the well lid structure obtained after the well lid exhaust device is installed below the well lid 1 is introduced as follows: a plurality of air inlet holes 25 are arranged in a circumferential distribution and penetrate the well lid 1 near the middle part, a plurality of air outlet holes 26 are arranged in a circumferential distribution and penetrate the well lid 1 near the edge, the culvert 2 is connected below the well lid 1 and the air inlet end 12 abuts against the lower surface of the well lid 1, the air inlet hole 25 is located on the inner side of the culvert 2, and the air outlet hole 26 is located on the outer side of the culvert 2; the air inlet hole 25 and the air outlet hole 26 can be the drain hole of the well lid 1 itself, so as to reduce the modification of the well lid, reduce the cost and improve the adaptability of the well lid exhaust device; when the motor 3 drives the fan blade 4 to generate downward airflow in the culvert 2, the airflow state at the well mouth of the sewer 10 is as shown in Figure 10 , it can be seen that the air inlet airflow is separated from the air outlet airflow by the culvert 2, and accelerates to the deep part of the sewer 10 in the culvert 2 with a contracted caliber, so as to improve the air exchange and exhaust effect of the sewer 10, thereby ensuring the safety of the sewer 10.

[0045] For installing and fixing the well lid exhaust device in the well mouth and abutting the air inlet end 12 against the well lid 1, a plurality of structure forms can be adopted, such as opening a groove on the stepped surface of the well lid seat 11 for placing the well lid 1, extending a plurality of support rods radially outside the culvert 2, and installing the support rods by making the free ends of the support rods fall into the groove, so as to support and fix the well lid exhaust device through the well lid seat 11, but this way not only needs to replace the well lid seat 11 and has high cost, but also needs to remove the well lid 1 and the well lid exhaust device in sequence when opening the well lid 1 to maintain and dredge the sewer 10, which is more troublesome to use; the culvert 2 can also be directly connected downward by arranging a vertical penetrating bolt on the well lid 1, but this way has certain requirements for the thickness of the culvert 2, which will increase the overall weight and cost; please refer to Figure 1 and Figure 9The connecting lug 27 is formed by protrusions arranged on the outer side of the culvert 2, and the manhole cover 1 is threadedly connected with the connecting lug 27 through the vertically penetrating second bolt 28, so as to fix the culvert 2 under the manhole cover 1, which is beneficial to controlling the thickness of the culvert 2 and connecting reliably, and the culvert 2 is fixed under the manhole cover 1 as a whole, and when the manhole cover 1 is removed or turned to open, the manhole cover exhaust device also leaves the well mouth, which is convenient for the maintenance and dredging of the sewer 10.

[0046] Please refer to Figure 7 and Figure 9 The positioning part 29 is annularly arranged on the lower surface of the manhole cover 1, the air inlet end 12 is located inside the positioning part 29, and the outer diameter of the air inlet end 12 matches the inner diameter of the positioning part 29, so that the air inlet end 12 is matched with the positioning part 29 during installation, and then the bolt is connected, so as to facilitate the positioning and installation; in addition, the positioning part 29 can be coaxial with the manhole cover 1, so that the culvert 2 is coaxial with the manhole cover 1, which is convenient for the air flow to uniformly surround the culvert 2 in the circumferential direction, so as to form a stable circulating air flow, which is beneficial to improving the ventilation and exhaust effect of the sewer 10.

[0047] The manhole cover structure in the embodiment is that the manhole cover exhaust device is installed under the manhole cover 1, and after the installation is completed, the staff communicates and connects the Bluetooth module 23 and the timing control module 8 by using a mobile phone or other equipment, sets or adjusts the time information for controlling the start and stop of the motor 3 according to the living habits of the residents in the area where the manhole cover 1 is located, so that the manhole cover exhaust device operates at midnight, blows air into the sewer 10 to form an internal and external circulating air flow, and then discharges the biogas in the sewer 10, which ensures the safe use of the sewer 10 without affecting the living environment; in the manhole cover exhaust device, the culvert 2 and the fan blade 4 are made of stainless steel which is corrosion-resistant and has high structural strength, the motor 3 is a waterproof brushless motor 3, and the control part only needs the Bluetooth module 23 and the timing control module 8, so the cost is low, which is beneficial to saving expenses while ensuring the safety of the municipal biogas, and the control box 5 is made of plastic material and is sealed at the wiring position, so the manhole cover exhaust device can be safely and stably operated for more than ten years; in addition, the manhole cover exhaust device is connected with the manhole cover 1 through the culvert 2, which is more convenient for opening and checking, and the two rings of drainage holes of the manhole cover 1 are used as the air inlet hole 25 and the air outlet hole 26 respectively, so that the manhole cover 1 is less changed.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A well lid venting device characterised by: The utility model provides a kind of well lid exhaust device, including the culvert for being installed under well lid, motor is fixedly arranged inside culvert, motor drive connection has located inside culvert and is coaxial with culvert fan leaf;Sealed control box is fixedly arranged outside culvert, power module, wireless communication module and timing control module are arranged in control box, timing control module is electrically connected with power module, wireless communication module and motor respectively, timing control module is used to control motor start-stop according to the time information stored in itself, power module is used to power supply, and wireless communication module is used to communicate with external device and adjust the time information.

2. A well lid venting device according to claim 1, characterised in that: The culvert has an air inlet end and an air outlet end, the air inlet end is used to connect with the well lid, and the motor drives the fan leaf to generate airflow from the air inlet end to the air outlet end.

3. A well lid venting device according to claim 2, characterised in that: The inner diameter of the air outlet end is smaller than that of the air inlet end.

4. A well lid venting device according to claim 3, characterised in that: The culvert includes a mounting section and a flow stabilizing section, the motor and the fan leaf are located inside the mounting section, the inner diameter of the mounting section is larger than that of the flow stabilizing section, the mounting section and the flow stabilizing section are connected through a guide section with a tapered inner diameter, the free end of the mounting section is the air inlet end, and the free end of the flow stabilizing section is the air outlet end.

5. A well lid venting device according to claim 2, characterised in that: The motor is coaxially arranged on the side of the fan leaf close to the air inlet end, the motor is coaxially provided with a conical baffle with a sharp end facing the air inlet end on the side close to the air inlet end, and the conical baffle is located inside the culvert and has a larger diameter than the motor.

6. A well lid venting device according to claim 2, characterised in that: The culvert and the fan leaf are made of stainless steel, the control box is made of plastic and is sealed and covered on the outer wall of the culvert, and the power module, the wireless communication module and the timing control module are spaced apart and installed on the outer wall of the culvert through heat-conducting elements.

7. A well lid venting device according to claim 2, characterised in that: The motor and the control box are respectively provided with temperature sensors electrically connected with the timing control module.

8. A well lid venting device according to claim 2, characterised in that: The wireless communication module is a Bluetooth module, and the timing control module is a single-chip microcomputer.

9. A well lid structure, characterised in that: The utility model provides a kind of well lid exhaust device, including the culvert for being installed under well lid, motor is fixedly arranged inside culvert, motor drive connection has located inside culvert and is coaxial with culvert fan leaf;Sealed control box is fixedly arranged outside culvert, power module, wireless communication module and timing control module are arranged in control box, timing control module is electrically connected with power module, wireless communication module and motor respectively, timing control module is used to control motor start-stop according to the time information stored in itself, power module is used to power supply, and wireless communication module is used to communicate with external device and adjust the time information.

10. A well lid structure according to claim 9, characterised in that: The culvert has an air inlet end and an air outlet end, the air inlet end is used to connect with the well lid, and the motor drives the fan leaf to generate airflow from the air inlet end to the air outlet end. The inner diameter of the air outlet end is smaller than that of the air inlet end. The culvert includes a mounting section and a flow stabilizing section, the motor and the fan leaf are located inside the mounting section, the inner diameter of the mounting section is larger than that of the flow stabilizing section, the mounting section and the flow stabilizing section are connected through a guide section with a tapered inner diameter, the free end of the mounting section is the air inlet end, and the free end of the flow stabilizing section is the air outlet end. The motor is coaxially arranged on the side of the fan leaf close to the air inlet end, the motor is coaxially provided with a conical baffle with a sharp end facing the air inlet end on the side close to the air inlet end, and the conical baffle is located inside the culvert and has a larger diameter than the motor. The culvert and the fan leaf are made of stainless steel, the control box is made of plastic and is sealed and covered on the outer wall of the culvert, and the power module, the wireless communication module and the timing control module are spaced apart and installed on the outer wall of the culvert through heat-conducting elements. The motor and the control box are respectively provided with temperature sensors electrically connected with the timing control module. The wireless communication module is a Bluetooth module, and the timing control module is a single-chip microcomputer. The utility model provides a kind of well lid exhaust device, including the culvert for being installed under well lid, motor is fixedly arranged inside culvert, motor drive connection has located inside culvert and is coaxial with culvert fan leaf;Sealed control box is fixedly arranged outside culvert, power module, wireless communication module and timing control module are arranged in control box, timing control module is electrically connected with power module, wireless communication module and motor respectively, timing control module is used to control motor start-stop according to the time information stored in itself, power module is used to power supply, and wireless communication module is used to communicate with external device and adjust the time information.

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