A fresh air supply device applied to closed space malodorous gas collection

Abstract

The utility model provides a kind of fresh air supply device applied to closed space foul gas collection, it is related to the air supply device technical field in the closed space of sewage treatment process, it include: for the drainage pipe of intercommunication collection pool inside and outside, drainage pipe is equipped with the limiting sheet with air inlet;Cap and drainage pipe top end thread connection;Annular air passage is equipped between cap and the circumference of drainage pipe, the circumference of drainage pipe is equipped with several air inlets, air inlet and air passage, cap outside air flow are communicated;Adjusting device includes valve core seat by support and drainage pipe inner wall fixed connection, movable rod by being inserted into valve core seat and can be up and down, and the sealing sheet of detachable connection with movable rod top end, spring of two ends respectively abutting on sealing sheet and valve core seat;By spring sealing sheet top end abuts on limiting sheet bottom surface and will air inlet be blocked;Beneficial effect: the device simple structure, can be timely air supply for closed space, can be automatically closed when needing not air supply.

Description

Technical Field

[0001] This utility model relates to the technical field of air replenishment devices in enclosed spaces during sewage treatment processes, and in particular provides a fresh air supply device for collecting odorous gases in enclosed spaces. Background Technology

[0002] The company is a wastewater treatment enterprise with various closed storage tanks, including coarse screens, influent pump stations, fine screens, grit chambers, primary sedimentation tanks, aerobic tanks, sludge thickening tanks, equalization tanks, sludge pump stations, and sludge conditioning tanks. These closed storage tanks generate odorous gases during operation. According to odor pollutant emission standards, these gases cannot be directly released into the atmosphere. However, these closed storage tanks require a large amount of fresh air replacement during operation to maintain the air quality at the work site meeting requirements. Therefore, we use induced draft fans to periodically extract, collect, treat, and purify the odorous gases to meet emission standards. However, during the extraction process, the negative pressure inside the tank increases under the action of the induced draft fans, severely affecting the suction capacity and preventing the odorous gases from being effectively treated. Therefore, it is necessary to replenish the closed storage tanks with gas. However, the initial air inlets are open, and when not extracting air, the odor will be discharged through the air inlets, affecting the environment.

[0003] Currently, there are various surface-level air supply and exhaust devices for enclosed sewage tanks on the market. Among them, CN 218108795 U discloses a surface-level air supply and exhaust device for enclosed sewage tanks. The application of this device optimizes the airflow organization in the enclosed space above the sewage tank, improving the exchange efficiency of fresh air and odorous gases within the tank. CN 217479148 U discloses a natural wind-powered sewage treatment device. This device forms a water seal through the second section of the outlet pipe, preventing gas from entering or exiting through the outlet pipe. This ensures that no other gas enters the container. CN 210395532 U discloses an automatic air supply device that can stabilize the internal pressure of drainage pipes. In this application, the first sealing ring seals the air inlet channel under pressure, ensuring a tight and reliable seal. Odors in the drainage pipe are trapped within the pipe and do not overflow, effectively preventing odors and germs from the sewer from entering the room.

[0004] However, commercially available air supply devices are all characterized by complex structures. In order to adapt to the various closed storage tanks of our company, we have independently developed a fresh air supply device for the collection of odorous gases in closed spaces. Summary of the Invention

[0005] The purpose of this invention is to provide a fresh air supply device for collecting odorous gases in enclosed spaces. This device has a simple structure, can replenish air to enclosed spaces in a timely manner, and can automatically remain in a closed state when no air replenishment is needed.

[0006] The technical solution of this utility model is:

[0007] A fresh air supply device for collecting odorous gases in enclosed spaces includes:

[0008] A drainage pipe is used to connect the inside and outside of the collection tank. The drainage pipe is connected to the top of the collection tank through a flange. The top of the drainage pipe is externally threaded. A limiting plate is provided inside the drainage pipe. An air inlet is provided on the limiting plate to connect the upper and lower parts of the limiting plate.

[0009] Furthermore, the collection tank is a closed space and can be any one of the following: coarse screen, inlet pump room, fine screen, grit chamber, primary sedimentation tank, anaerobic tank of biological reaction tank, aerobic tank of biological reaction tank, sludge thickening tank, homogenizing tank, sludge pump room, and sludge conditioning tank. Odorous gases will be generated in the collection tank. An exhaust fan is provided at the side of the collection tank, and the exhaust fan is connected to the inside of the collection tank through an exhaust pipe.

[0010] A cap is attached to the drainage tube and threaded to the top of the drainage tube. After connection, an annular air passage is provided between the cap and the drainage tube in the circumferential direction. Several air inlets are provided in the circumferential direction of the drainage tube inside the cap. The air inlets are connected to the air passage and the airflow outside the cap.

[0011] The adjusting device includes a valve core seat fixedly connected to the inner wall of the drainage tube via a bracket, a movable rod inserted into the valve core seat and movable up and down, a sealing plate detachably connected to the top of the movable rod, and springs at both ends respectively abutting the sealing plate and the valve core seat; due to the force of the springs, the top of the sealing plate abuts against the bottom surface of the limiting plate and blocks the air outlet;

[0012] When the blower draws air from inside the collection tank to outside the collection tank, a certain negative pressure is formed inside the collection tank. Due to the negative pressure, the sealing plate is pulled downward and overcomes the elastic force of the spring. The sealing plate is driven to move downward through the movable rod. The sealing plate is no longer attached to the bottom surface of the limiting plate. Therefore, an airflow channel is formed between the sealing plate and the limiting plate. Due to the negative pressure, external gas enters the collection tank through the outside of the cap in sequence from the air passage, air inlet, air outlet, airflow channel, and drainage pipe to replenish the collection tank with external air.

[0013] Furthermore, the hydraulic cylinder is fixed to the top of the cap by the base and bolts, and a rubber layer is provided between the hydraulic cylinder and the cap to seal it. Therefore, it is convenient to disassemble the hydraulic cylinder for maintenance and ensure the sealing of the drainage tube. The piston rod in the hydraulic cylinder passes through the top of the cap and is inserted into the drainage tube. By driving the piston rod in the hydraulic cylinder, the sealing plate is pushed downward and overcomes the elastic force of the spring, so that an airflow channel is formed between the sealing plate and the limiting plate.

[0014] Furthermore, the drainage pipe is installed above the liquid surface in the collection tank and / or the bottom end of the drainage pipe is inclined to ensure that the bottom end of the drainage pipe is connected to the gas in the collection tank. Preferably, the bottom end of the drainage pipe is at a 45-degree angle to avoid water sealing when the water level rises.

[0015] Furthermore, a pressure sensor is installed in the collection pool. The pressure sensor and the hydraulic cylinder are electrically connected to the terminal controller. The pressure sensor uploads a signal to the terminal controller. When the blower starts or the pressure sensor senses that the pressure in the collection pool reaches a certain value, the piston rod in the hydraulic cylinder is controlled to push the sealing plate downward, so that an airflow channel is formed between the sealing plate and the limiting plate.

[0016] Furthermore, the movable rod and the sealing plate can be connected by threads, that is, the sealing plate includes a cover plate that is threadedly connected to the movable rod and a rubber sheet that is fixedly connected to the top of the cover plate; when the spring fails, the movable rod and the sealing plate can be disassembled, the movable rod can be pulled out, and the spring can be taken out and replaced.

[0017] Furthermore, the bracket is a triangular bracket, which is fixedly connected to the inner wall of the drainage pipe and can be welded. The valve core seat is cylindrical, and the outer wall of the valve core seat is welded to the bracket. The valve core seat has a through hole in the center, and the movable rod is inserted into the through hole and can move up and down. The triangular bracket does not affect the gas in the collection tank from entering the air outlet through the airflow channel.

[0018] The advantages and positive effects of this utility model are:

[0019] This fresh air supply device has a simple structure. When the air pressure in the collection tank is low, i.e., when the induced draft fan draws air from inside the collection tank to the outside, creating a certain negative pressure, the sealing plate is pulled downwards due to the negative pressure, overcoming the spring force. The sealing plate moves downwards via the movable rod, and it no longer adheres to the bottom surface of the limiting plate. Therefore, an airflow channel is formed between the sealing plate and the limiting plate. Due to the negative pressure, external air enters the collection tank sequentially through the outside of the cap, via the air passage, air inlet, induced draft port, airflow channel, and drainage pipe, replenishing the collection tank with external air and maintaining the air pressure balance within the collection tank. When the negative pressure's suction effect is lost, the spring force causes the top of the sealing plate to press against the bottom surface of the limiting plate, blocking the induced draft port and preventing the gas in the collection tank from escaping.

[0020] This device has a simple structure. The cap is attached to the drainage tube and is threaded to the top of the drainage tube. Therefore, unscrewing the cap makes it easy to disassemble and inspect the sealing condition of the sealing plate inside the drainage tube. The spring can also be replaced periodically to ensure the sealing condition. Since the movable rod and the sealing plate are connected by threads, during later maintenance, the movable rod can be screwed to separate it from the sealing plate, and the movable rod can be pulled out to take out and replace the spring.

[0021] To further ensure that when the negative pressure exceeds a certain value, the sealing sheet no longer adheres to the bottom surface of the limiting sheet, the piston rod in the hydraulic cylinder pushes the sealing sheet downward and overcomes the spring force, thus ensuring that external air can smoothly enter the collection pool.

[0022] Because a pressure sensor is installed in the collection tank, when the induced draft fan starts or the pressure sensor detects that the pressure in the collection tank reaches a certain value, it controls the piston rod in the hydraulic cylinder to push the sealing plate downward, so that an airflow channel is formed between the sealing plate and the limiting plate, thus ensuring that outside air can smoothly enter the collection tank.

[0023] Because the drainage pipe is installed above the liquid surface in the collection tank and / or the bottom of the drainage pipe is sloping, it ensures that the bottom of the drainage pipe is connected to the gas in the collection tank, thus avoiding water sealing caused by the drainage pipe being inserted into the water, and also preventing water sealing when the water level rises. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a fresh air supply device used for collecting odorous gases in enclosed spaces.

[0025] Figure 2 yes Figure 1 A magnified view of part A, indicated by the dashed circle in the middle;

[0026] In the picture:

[0027] 1. Drainage pipe 2. Collection tank 3. Flange

[0028] 4. Limiting plate 5. Air vent 6. Cap

[0029] 7. Air passageway; 8. Air inlet; 9. Support bracket

[0030] 10. Valve core seat; 11. Moving rod; 12. Sealing plate

[0031] 13. Spring 14. Hydraulic cylinder 15. Piston rod

[0032] 16. Pressure sensor; 17. Cover plate; 18. Rubber sheet Detailed Implementation

[0033] Example 1:

[0034] A fresh air supply device for collecting odorous gases in enclosed spaces includes:

[0035] Drainage tube 1, such as Figure 2As shown, the drainage pipe 1 is used to connect the inside and outside of the collection pool 2. The drainage pipe 1 is connected to the top of the collection pool 2 through the flange 3. The top of the drainage pipe 1 is externally threaded. The drainage pipe 1 has a limiting plate 4 welded inside. The limiting plate 4 is provided with an air inlet 5 that connects the upper and lower parts of the limiting plate 4.

[0036] Furthermore, the collection tank 2 is a closed space, specifically a sludge thickening tank. Odorous gases are generated within the collection tank 2, requiring a blower to periodically extract air from inside the tank and simultaneously replenish the sealed storage tank to maintain adequate air quality at the work site. An exhaust fan is installed at the edge of the collection tank 2, connected to the interior of the tank via an exhaust pipe. The blower extracts and filters the odorous gases from the collection tank 2 to meet emission standards.

[0037] The cap 6 is fastened onto the drainage pipe 1 and threaded to the top of the drainage pipe 1; after connection, an annular air passage 7 is provided between the cap 6 and the drainage pipe 1 in the circumference, and the drainage pipe 1 inside the cap 6 is provided with several air inlets 8 in the circumference, and the air inlets 8 are connected to the air passage 7 and the airflow outside the cap 6.

[0038] The adjusting device includes a valve core seat 10 fixedly connected to the inner wall of the drainage pipe 1 via a bracket 9, a movable rod 11 inserted into the valve core seat 10 and movable up and down, a sealing plate 12 detachably connected to the top end of the movable rod 11, and springs 13 with their two ends respectively abutting against the sealing plate 12 and the valve core seat 10; due to the force of the spring 13, the top end of the sealing plate 12 abuts against the bottom surface of the limiting plate 4 and blocks the air outlet 5;

[0039] The working process is as follows: When the blower draws air from inside the collection tank 2 to outside the collection tank 2, a certain negative pressure is formed inside the collection tank 2. Due to the negative pressure, the sealing plate 12 is pulled downward and overcomes the elastic force of the spring 13. The sealing plate 12 is driven downward by the movable rod 11, and the sealing plate 12 is no longer attached to the bottom surface of the limiting plate 4. Therefore, an airflow channel is formed between the sealing plate 12 and the limiting plate 4. Due to the negative pressure, external gas enters the collection tank 2 through the outside of the cap 6 in sequence from the air passage 7, air inlet 8, air outlet 5, airflow channel, and drainage pipe 1, replenishing the collection tank 2 with external air. Thus, fresh air is added, maintaining the air pressure balance inside the collection tank 2. When the suction effect of the negative pressure is lost, due to the force of the spring 13, the top of the sealing plate 12 abuts against the bottom surface of the limiting plate 4 and blocks the air outlet 5, thus preventing the gas inside the collection tank 2 from being discharged.

[0040] The bracket 9 is a triangular bracket 9, which is fixedly connected to the inner wall of the drainage pipe 1. The valve core seat 10 is cylindrical, and the outer wall of the valve core seat 10 is welded to the bracket 9. The valve core seat 10 has a through hole in the center, and the movable rod 11 is inserted into the through hole and can move up and down. The triangular bracket 9 does not affect the gas in the collection tank 2 from entering the air outlet 5 through the airflow channel.

[0041] The drainage pipe 1 is installed above the liquid surface in the collection tank 2, and the bottom end of the drainage pipe 1 is 45° inclined to avoid water sealing when the water level rises.

[0042] The device has a simple structure. The cap 6 is fastened to the drainage tube 1 and is threaded to the top of the drainage tube 1. Therefore, unscrewing the cap 6 makes it easy to disassemble and inspect the sealing condition of the internal sealing sheet 12 of the drainage tube 1.

[0043] The movable rod 11 and the sealing plate 12 are connected by threads. The sealing plate 12 includes a cover 17 that is threadedly connected to the movable rod 11 and a rubber sheet 18 that is fixedly connected to the top of the cover 17. When inspecting the inside of the collection pool 2, the spring 13 can be replaced to ensure the sealing. Since the movable rod 11 and the sealing plate 12 are connected by threads, it will be more convenient to replace the spring 13 from the bottom of the drainage pipe 1 when inspecting the collection pool 2 as a whole and entering the collection pool 2. Because of the use of the triangular bracket 9, the movable rod 11 can be pulled down by hand through the bracket 9, and the sealing plate 12 can be twisted to separate the sealing plate 12 from the movable rod 11. At this time, the movable rod 11 can be pulled out and the spring 13 can be removed and replaced, which is convenient for maintenance.

[0044] Example 2:

[0045] Based on Example 1, to further ensure that when the negative pressure is greater than a certain value, the sealing sheet 12 no longer adheres to the bottom surface of the limiting sheet 4, the hydraulic cylinder 14 is fixed to the top of the cap 6, and the hydraulic cylinder 14 and the cap 6 are sealed. The piston rod 15 in the hydraulic cylinder 14 passes through the top of the cap 6 and is inserted into the drain pipe 1. By driving the piston rod 15 in the hydraulic cylinder 14 to push the sealing sheet 12 downward and overcome the elastic force of the spring 13, an airflow channel is formed between the sealing sheet 12 and the limiting sheet 4. By pushing the sealing sheet 12 downward and overcoming the elastic force of the spring 13 through the piston rod 15 in the hydraulic cylinder 14, it is ensured that external air can smoothly enter the collection pool 2.

[0046] Furthermore, the hydraulic cylinder 14 is commercially available and consists of a cylinder barrel, piston, piston rod 15, sealing device, buffer device, and venting device. The cylinder barrel and piston form a sealed space. When hydraulic oil is pumped into one side of the cylinder barrel, pressure is generated on one side of the piston, forcing the piston to move along the inner wall of the cylinder barrel. The piston rod 15 is connected to the piston, converting the piston's movement into linear motion, thereby pushing the sealing plate 12.

[0047] Example 3:

[0048] Based on Example 2, a pressure sensor 16 is provided in the collection pool 2. The pressure sensor 16 and the hydraulic cylinder 14 are electrically connected to the terminal controller. The pressure sensor 16 uploads a signal to the terminal controller. When the induced draft fan starts and generates negative pressure, the hydraulic cylinder 14 is activated to push the sealing plate 12 to ensure that external air can smoothly enter the collection pool 2.

[0049] Alternatively, to save energy, as described in Example 1, the hydraulic cylinder 14 is not activated. Instead, the negative pressure suction creates an airflow channel between the sealing plate 12 and the limiting plate 4, ensuring that external air can smoothly enter the collection pool 2.

[0050] When the pressure in the collection pool 2 reaches a certain value and the top of the sealing plate 12 is still against the bottom surface of the limiting plate 4 and blocking the air inlet 5, the pressure sensor 16 can sense that the pressure in the collection pool 2 has reached a certain value. At this time, the piston rod 15 in the hydraulic cylinder 14 is controlled to push the sealing plate 12 downward so that an airflow channel is formed between the sealing plate 12 and the limiting plate 4.

[0051] Furthermore, the pressure sensor 16 is a piezoresistive sensor: the working principle of the piezoresistive sensor is based on the thin-film resistance effect, that is, when external pressure is applied, the resistance value of the sensing element changes. The sensing element is composed of a thin film. When external pressure is applied to the thin film, the deformation of the thin film causes a change in the resistance value. The circuit converts the changed resistance value into a corresponding electrical signal output.

[0052] After receiving the electrical signal from the pressure sensor 16, the terminal controller compares it with a preset value. When the pressure exceeds a certain value, the terminal controller adjusts the components of the hydraulic cylinder 14 via electrical signals, thereby controlling the movement of the hydraulic cylinder 14.

[0053] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A fresh air supply device for collecting odorous gases in enclosed spaces, characterized in that: include: A drainage pipe is used to connect the inside and outside of the collection tank. The drainage pipe is connected to the top of the collection tank through a flange. The top of the drainage pipe is externally threaded. A limiting plate is provided inside the drainage pipe. An air inlet is provided on the limiting plate to connect the upper and lower parts of the limiting plate. A cap is attached to the drainage tube and threaded to the top of the drainage tube. After connection, an annular air passage is provided between the cap and the drainage tube in the circumferential direction. Several air inlets are provided in the circumferential direction of the drainage tube inside the cap. The air inlets are connected to the air passage and the airflow outside the cap. The adjusting device includes a valve core seat fixedly connected to the inner wall of the drainage tube via a bracket, a movable rod inserted into the valve core seat and movable up and down, a sealing plate detachably connected to the top of the movable rod, and springs at both ends respectively abutting the sealing plate and the valve core seat; due to the force of the springs, the top of the sealing plate abuts against the bottom surface of the limiting plate and blocks the air outlet; When a negative pressure is formed in the collection pool, the sealing sheet is pulled downward and overcomes the elastic force of the spring. The sealing sheet is driven to move downward by the movable rod. The sealing sheet is no longer attached to the bottom surface of the limiting plate. An airflow channel is formed between the sealing sheet and the limiting plate. External gas enters the collection pool through the outside of the cap in sequence from the air passage, air inlet, air outlet, airflow channel, and drainage pipe to replenish the collection pool with external air.

2. The fresh air supply device for collecting odorous gases in a confined space according to claim 1, characterized in that: The hydraulic cylinder is fixed to the top of the cap, and the hydraulic cylinder and the cap are sealed. The piston rod in the hydraulic cylinder passes through the top of the cap and is inserted into the drain pipe. By driving the piston rod in the hydraulic cylinder, the sealing plate is pushed downward and overcomes the elastic force of the spring, so that an airflow channel is formed between the sealing plate and the limiting plate.

3. A fresh air supply device for collecting odorous gases in a confined space, as described in claim 1 or 2, characterized in that: The drainage pipe is installed above the liquid surface in the collection tank and / or the bottom end of the drainage pipe is sloping.

4. A fresh air supply device for collecting odorous gases in a confined space according to claim 3, characterized in that: The collection pool is equipped with a pressure sensor, and the pressure sensor and the hydraulic cylinder are electrically connected to the terminal controller.

5. A fresh air supply device for collecting odorous gases in a confined space according to claim 4, characterized in that: The movable rod and the sealing plate are connected by threads, that is, the sealing plate includes a cover plate that is threadedly connected to the movable rod and a rubber sheet that is fixedly connected to the top of the cover plate.

6. A fresh air supply device for collecting odorous gases in a confined space according to claim 5, characterized in that: The bracket is fixedly connected to the inner wall of the drainage tube and the outer wall of the valve core seat. The valve core seat is cylindrical and has a through hole in the center. The movable rod is inserted into the through hole and can move up and down.

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