Multi-suction-port exhaust system with butterfly valve

Abstract

The invention discloses a multi-suction-port exhaust system with a butterfly valve. The multi-suction-port exhaust system comprises a dust hood, an exhaust fan, the butterfly valve, a rear flexible joint, an exhaust treatment device, a hard joint and a front flexible joint. By means of the tightness of the butterfly valve when the butterfly valve is closed, the problem that due to the fact that an existing one-way valve is not closed tightly, pollutants discharged by a working area where air exhaust is started are diffused to other working areas where air exhaust is not started is solved. Meanwhile, in the exhaust operation process, the butterfly valve is always in an open state, and the situation that a valve element needs to be jacked open through the impact force of exhaust air flow from beginning to end to achieve normal flowing of the exhaust air flow like an existing one-way valve is not needed; the device has an energy-saving effect. Moreover, the butterfly valve belongs to a quick-opening valve, and has convenience and flexibility in operation in the opening or closing process.

Description

Technical Field

[0001] This invention belongs to the field of ventilation technology, specifically relating to a multi-inlet exhaust system with butterfly valves that allows multiple work areas to share a single exhaust system without affecting each other. Background Technology

[0002] In people's daily life and production processes, exhaust systems are usually installed in work areas that generate dust, smoke, and toxic and harmful gaseous pollutants to remove these pollutants in a timely manner, in order to protect the health of workers and ensure the safe operation of equipment and facilities.

[0003] In current exhaust systems, one-way valves installed after the exhaust fan to prevent backflow of exhaust air are mainly of the following types: suspended one-way valves, spring-loaded one-way valves, and fan-shaped one-way valves. During exhaust, the impact force of the flowing air is required to open these one-way valves. This necessitates a continuous consumption of the flowing air's energy, causing the exhaust fan to provide more energy to operate normally, resulting in energy waste. Furthermore, these one-way valves do not close tightly.

[0004] For multi-intake exhaust systems, if the one-way valves do not close tightly, pollutants emitted from work areas with activated exhaust can spread through the main exhaust duct to other work areas without activated exhaust. This causes environmental pollution in these non-activated work areas, affecting the health of workers and the safe operation of equipment.

[0005] To address the aforementioned issues, it is necessary to improve the existing exhaust system and propose a multi-inlet exhaust system with a butterfly valve. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-intake exhaust system with a butterfly valve. In this exhaust system, a rigid joint with high rigidity connects the butterfly valve and the exhaust fan, making them a rigid unit. Flexible joints connect this rigid unit to each exhaust branch pipe. This system prevents the spread of pollutants emitted from one work area to other work areas, while also offering convenient, flexible, and energy-saving operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution.

[0008] A multi-intake exhaust system with a butterfly valve includes a dust extraction hood, an exhaust fan, a butterfly valve, an exhaust treatment device, a rigid connector, and a flexible connector. The flexible connector includes a front flexible connector and a rear flexible connector. Each work area that generates dust, fumes, and toxic or harmful gaseous pollutants is equipped with an exhaust branch pipe. When a work area is in operation, the exhaust fan in that branch pipe starts, the butterfly valve opens, and the generated pollutants are sequentially passed through the dust extraction hood, the front flexible connector, the exhaust fan, the rigid connector, the butterfly valve, and the rear flexible connector in the exhaust branch pipe, entering the main exhaust duct and being sent to the exhaust treatment device for treatment before being discharged.

[0009] The aforementioned dust collection hood creates a negative pressure zone inside the hood due to the suction of the exhaust fan. Dust, fumes, and toxic or harmful gaseous pollutants generated during work in the work area flow towards the dust collection hood under this negative pressure.

[0010] The dust hood collects these pollutants, which are then drawn in by the exhaust fan and sent to the exhaust treatment unit for processing before being discharged. This maintains a good working environment in the work area, ensuring the health of relevant personnel and the safe operation of equipment and facilities.

[0011] The butterfly valve features a circular plate-shaped valve core, and the valve body and seat in contact with the valve core are also circular, ensuring a good seal between the valve core and seat. Therefore, the butterfly valve is characterized by its tight closure. When the butterfly valve is open, there is a flow channel on each side of the circular plate-shaped valve core, between it and the valve body and seat. The butterfly valve is a quick-opening valve; simply rotating the operating handle 90 degrees is sufficient to open or close it, making operation simple.

[0012] During the opening or closing operation of the butterfly valve, the opening or closing status can be intuitively determined by the relative position of the operating handle and the exhaust branch pipe. When the operating handle of the butterfly valve is parallel to the exhaust branch pipe, the flow channel in the middle of the valve core is open, and the butterfly valve is in the open state; when the operating handle of the butterfly valve is perpendicular to the exhaust branch pipe, the flow channel in the middle of the valve core is closed, and the butterfly valve is in the closed state.

[0013] Butterfly valves are characterized by tight shut-off, which can prevent dust, smoke, and toxic and harmful gaseous pollutants generated in each work area from spreading to other work areas.

[0014] During the exhaust process, the butterfly valve remains open, eliminating the need for the force of the flowing gas to open it. Therefore, the butterfly valve does not consume the energy required for the flowing gas to open, thus achieving energy savings for the system.

[0015] The rigid joint, with its high rigidity, connects the butterfly valve and the exhaust fan into a rigid whole. During the operation of the exhaust system, the airflow delivered by the exhaust fan is fast and highly turbulent, possessing a strong scouring ability. Even after passing through the short rigid joint, this airflow still retains a strong scouring ability, preventing dust, smoke, and toxic or harmful gaseous pollutants from remaining or accumulating inside the butterfly valve, ensuring that the inside of the butterfly valve remains clean at all times.

[0016] Because the inside of the butterfly valve is always kept clean, problems such as incomplete closure and jamming during its opening or closing are avoided, ensuring the convenience and flexibility of butterfly valve operation.

[0017] The flexible joint includes a front flexible joint and a rear flexible joint. The rigid joint connects the butterfly valve and the exhaust fan into a rigid whole, and the flexible joint connects this rigid whole into the exhaust branch pipe.

[0018] Flexible joints possess excellent flexibility, enabling them to absorb vibration. When the exhaust fan of a branch duct is running, they prevent the fan's vibration from being transmitted to the dust hood, main exhaust duct, other branch ducts, and other equipment. This avoids accidents such as pipe ruptures, breaks, and equipment damage caused by vibration transmitted from the exhaust fan, ensuring the safe operation of the entire exhaust system and extending its service life.

[0019] This exhaust system, due to the tight sealing performance of the butterfly valve when closed, prevents pollutants emitted from one work area from spreading to other work areas; the inside of the butterfly valve is always kept clean, preventing problems such as jamming and incomplete sealing during operation; during operation, the butterfly valve is in the open state, and unlike current one-way valves, it does not require the impact force of the exhaust airflow to open the valve core, thus achieving energy-saving effects.

[0020] Other advantages, objectives and features of the present invention will be set forth in the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the multi-inlet exhaust system with butterfly valve of the invention.

[0022] Figure 2 This is a partial structural diagram of the multi-inlet exhaust system with butterfly valve of the invention.

[0023] Explanation of reference numerals in the attached figures: 1-Dust hood; 2-Exhaust fan; 3-Butterfly valve; 4-Rear flexible connector; 5-Exhaust treatment device; 6-Exhaust main pipe; 7-Exhaust branch pipe; 8-Rigid connector; 9-Front flexible connector; 31-Butterfly valve inlet; 32-Valve body; 33-Valve stem; 34-Operating handle; 35-Butterfly valve outlet; 36-Valve seat; 37-Valve core; 38-Internal flow channel of valve. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These preferred embodiments are merely illustrative and not intended to limit the scope of protection of the invention.

[0025] See the example. Figure 1 The multi-intake exhaust system with butterfly valves includes a dust hood 1, an exhaust fan 2, a butterfly valve 3, an exhaust treatment device 5, a rear flexible connector 4, a rigid connector 8, and a front flexible connector 9. The dust hood 1 collects dust, fumes, and toxic / harmful gaseous pollutants generated during work. Using the suction of the exhaust fan 2, these pollutants are sent to the exhaust treatment device 5 for treatment and then discharged through exhaust branch pipes 7 and the main exhaust pipe 6. This maintains a good working environment in the work area, ensuring the health of relevant personnel and the safe operation of equipment and facilities.

[0026] Specifically, each work area is equipped with an exhaust branch pipe 7 to collect dust, smoke, and toxic and harmful gaseous pollutants generated during work. When a work area is in operation, the exhaust fan 2 of the exhaust branch pipe 7 is started, and the butterfly valve 3 is opened, allowing the generated pollutants to pass sequentially through the dust collection hood 1, the front flexible connector 9, the exhaust fan 2, the rigid connector 8, the butterfly valve 3, and the rear flexible connector 4 in the exhaust branch pipe 7, and then into the main exhaust pipe 6, where they are sent to the exhaust treatment device 5 for treatment before being discharged.

[0027] In this embodiment, the dust hood 1 forms a negative pressure in its internal area under the suction action of the exhaust fan 2. Driven by this negative pressure, dust, smoke, and toxic and harmful gaseous pollutants generated during operation flow into the dust hood 1.

[0028] Since all pollutants flowed into the dust collection hood 1, the work area maintained a good working environment, ensuring the health of relevant staff and the safe operation of equipment and facilities.

[0029] In this embodiment, the butterfly valve 3 is a quick-opening valve. Simply rotating the operating handle 34 90 degrees will open or close the butterfly valve 3, making it easy to operate.

[0030] During operation, the operating handle 34 of the butterfly valve 3 rotates, which drives the valve core 37 to rotate through the valve stem 33, thereby changing the relative positional relationship between the flow channel 38 inside the valve and the valve seat 36, thus realizing the opening or closing of the butterfly valve 3.

[0031] The relative position of the operating handle 34 and the exhaust branch pipe 7 allows for a direct visual determination of the open or closed state of the butterfly valve 3. When the operating handle 34 of the butterfly valve 3 is parallel to the exhaust branch pipe 7, the butterfly valve 3 is in the open state; when the operating handle 34 of the butterfly valve 3 is perpendicular to the exhaust branch pipe 7, the butterfly valve 3 is in the closed state.

[0032] Butterfly valve 3 has a tight shut-off function, preventing dust, smoke, and toxic or harmful gaseous pollutants generated in the work area with exhaust ventilation activated from spreading to other work areas without exhaust ventilation activated through the main exhaust pipe 6. This maintains a good working environment in the work area, ensuring the health of relevant personnel and the safe operation of equipment and facilities.

[0033] During the exhaust process, butterfly valve 3 remains open, eliminating the need for the force of the flowing gas to open it. This eliminates the need to consume the energy of the flowing gas, thus achieving energy savings for the exhaust system.

[0034] In this embodiment, a rigid connector 8 with high rigidity is used to connect the butterfly valve 3 and the exhaust fan 2 into a rigid whole. The rigid connector 8 has a length of 60 mm to 120 mm, and the airflow delivered by the exhaust fan 2 still has a strong scouring ability on the butterfly valve 3. This prevents dust, smoke, and toxic and harmful gaseous pollutants from remaining or accumulating inside the butterfly valve 3, ensuring that the inside of the butterfly valve 3 is always in a clean state.

[0035] Because the interior is always kept clean, the operation of butterfly valve 3 is free from jamming and incomplete closure during opening or closing, ensuring the convenience and flexibility of butterfly valve 3 operation.

[0036] In this embodiment, a rigid connector 8 connects the butterfly valve 3 and the exhaust fan 2 into a rigid whole, and then a flexible connector is used to connect this rigid whole to the exhaust branch pipe 7. The flexible connector includes a front flexible connector 9 and a rear flexible connector 4.

[0037] Flexible joints possess excellent flexibility, enabling them to absorb vibration. When the exhaust fan 2 of a branch duct 7 is running, they prevent the vibration generated by the exhaust fan 2 from being transmitted to the dust hood 1, the main exhaust duct 6, other branch ducts 7, and other equipment. This avoids accidents such as pipe breakage, pipe rupture, and equipment damage caused by vibration, ensuring the safe operation of the entire exhaust system.

[0038] In this embodiment, before work begins in a certain work area, the exhaust fan 2 is started first, and then the butterfly valve 3 is opened to prevent exhaust air from other areas from flowing back into this area and causing environmental pollution. When work in this work area stops, the exhaust fan 2 removes all pollutants generated during the work process, and then clean air is used to purge for 2 to 4 minutes before closing the butterfly valve 3 and stopping the exhaust fan 2. This ensures that the butterfly valve 3 remains clean after it stops operating, thereby extending its service life.

[0039] This exhaust system utilizes the tight sealing performance of butterfly valve 3 when closed, solving the problem of pollutants emitted from the work area with exhaust activated spreading to other work areas without exhaust activated via the exhaust manifold 6 due to the incomplete sealing of currently used one-way valves. Simultaneously, during the operation of the exhaust system, butterfly valve 3 remains open, unlike currently used one-way valves which require the impact force of the exhaust airflow to open the valve core 37 throughout operation to achieve normal airflow; this exhaust system also offers energy-saving benefits.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should all be covered within the scope of the claims of the present invention.

Claims

1. A multi-inlet exhaust system with a butterfly valve, comprising a dust collection hood (1), an exhaust fan (2), a butterfly valve (3), a rear flexible connector (4), an exhaust treatment device (5), a rigid connector (8), and a front flexible connector (9); characterized in that: By utilizing the tightness of the butterfly valve (3) when closed, the problem of pollutants emitted from the work area that has started exhaust ventilation being diffused to other work areas that have not started exhaust ventilation through the exhaust manifold (6) is solved because the current one-way valve is not tight when closed. At the same time, the butterfly valve (3) is always open during the operation of the exhaust system, unlike the current one-way valve, which requires the impact force of the exhaust airflow to open the valve core (37) from beginning to end in order to achieve normal flow of exhaust airflow.

2. The multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: The butterfly valve (3) is a quick-opening valve. During operation, rotating the operating handle (34) causes the valve core (37) to rotate through the valve stem (33), which changes the relative position between the flow channel (38) and the valve seat (36) inside the valve. The butterfly valve (3) can be opened or closed simply by rotating the operating handle (34) by 90 degrees. The operation is simple.

3. The multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: The butterfly valve (3) has a tight shut-off function, which can prevent dust, smoke and toxic and harmful gas pollutants generated when the exhaust ventilation is activated from spreading to other work areas that have not activated the exhaust ventilation through the exhaust main pipe (6); it maintains a good working environment in the work area and ensures the health of relevant personnel and the safe operation of equipment and facilities.

4. A multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: During the exhaust process, the butterfly valve (3) is always in the open state, and it does not need to be opened by the impact force of the flowing gas; therefore, it does not need to consume this part of the energy of the flowing gas, thus achieving the energy-saving effect of the exhaust system.

5. A multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: A rigid connector (8) with high rigidity is used to connect the butterfly valve (3) and the exhaust fan (2) into a rigid whole; the length of the rigid connector (8) is 60 mm to 120 mm, and the airflow sent out by the exhaust fan (2) still has a strong scouring ability on the butterfly valve (3); it can prevent dust, smoke, and toxic and harmful gas pollutants from staying or depositing inside the butterfly valve (3), and ensure that the inside of the butterfly valve (3) is always clean.

6. A multi-inlet exhaust system with a butterfly valve according to claim 4, characterized in that: Since the interior is always kept clean, the operation of the butterfly valve (3) is not blocked or not tightly closed during the opening or closing process, thus ensuring the convenience and flexibility of the butterfly valve (3) operation.

7. A multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: The rigid joint (8) connects the butterfly valve (3) and the exhaust fan 2 into a rigid whole, and then the flexible joint connects this rigid whole to the exhaust branch pipe (7). When the exhaust fan (2) of a certain exhaust branch pipe (7) is running, the flexible joint has excellent flexibility and can absorb vibration. It can prevent the vibration generated by the exhaust fan (2) from being transmitted to the dust hood (1), the exhaust main pipe (6), other exhaust branch pipes (7) and other equipment.

8. A multi-inlet exhaust system with a butterfly valve according to claim 1, characterized in that: Before starting work in a certain work area, start the exhaust fan (2) and then open the butterfly valve (3) to prevent exhaust air from other areas from flowing back into this area and causing environmental pollution. When the work area stops working, after the exhaust fan (2) has removed all pollutants, clean air is used to blow clean air for 2 to 4 minutes before closing the butterfly valve (3) and stopping the exhaust fan (2). Ensure that the butterfly valve (3) is also in a clean state after it stops running, so as to extend the service life of the butterfly valve (3).

Images