TWI716501B - Energy-saving air duct system - Google Patents

Abstract

An energy-saving air duct system includes an air collecting main pipe, an exhaust gas purification unit, an air collecting branch unit and an air guiding unit. The gas-gathering branch pipe unit includes an upstream gas-gathering branch pipe connected with an upstream gas-collecting port and a first downstream air inlet at both ends, and a downstream first gas-collecting branch pipe connected with a first downstream gas-collecting port and a gas-collecting main pipe at both ends respectively , And a downstream second gas collecting branch pipe whose two ends are respectively connected with a second downstream gas collecting port and a second downstream gas inlet. The air guiding unit includes an upstream air guiding device that makes the gas flow from the upstream gas collection port to the downstream first air inlet, a downstream first air guiding device that allows the gas to flow from the downstream first gas collection port to the gas collection manifold, and a The second downstream air guiding device where the gas flows from the second downstream gas collection port to the second downstream gas inlet.

Description

Energy-saving air duct system

The invention relates to an air duct system, in particular to an energy-saving air duct system capable of saving energy consumption.

In the production process of general industrial products, exhaust gas containing volatile organic compounds (VOC) and other harmful components is often produced due to various manufacturing processes. Such exhaust gas needs to be collected through a duct system and passed through the exhaust gas. The purification device carries out the purification treatment of incineration or recycling to prevent the exhaust gas from toxic to the environment and human body. Generally speaking, the operating energy consumption of the exhaust gas purification device is positively related to the total collected air volume of the exhaust gas that must be treated. In other words, within a certain exhaust gas concentration, the higher the total collected air volume of exhaust gas input to the exhaust gas purification device, the higher the power state of the exhaust gas purification device will be required to purify the exhaust gas. Therefore, how to effectively control the energy consumption of the exhaust gas purification device within a limited range to save unnecessary waste of energy is an important issue in the industry.

Therefore, one of the objectives of the present invention is to provide an energy-saving air duct system that can solve the energy consumption problem.

Therefore, the energy-saving air duct system of the present invention is installed in an upstream gas gathering area and a downstream gas gathering area which are isolated from each other. The upstream gas gathering area has an upstream gas gathering port. The downstream gas gathering area has a downstream first air inlet, a downstream second air inlet, a downstream first air gathering port and a downstream second air gathering port. The energy-saving air duct system includes an air collecting main pipe, an exhaust gas purification unit arranged on the air collecting main pipe, an air collecting branch pipe unit and an air guiding unit. The gas collecting branch pipe unit includes an upstream gas collecting branch pipe connected to the upstream gas collecting port and the downstream first air inlet at both ends, and one downstream first gas collecting port connected to the downstream first gas collecting port and the first downstream collecting pipe at both ends of the gas collecting main pipe. An air branch pipe, and a second downstream air collecting branch pipe connected with the second downstream air collecting port and the second downstream air inlet respectively at both ends. The air guiding unit includes an upstream air guiding device, a downstream first air guiding device and a downstream second air guiding device. The upstream air guiding device is installed on the upstream gas collecting branch pipe, so that the gas in the upstream gas collecting branch pipe flows from the upstream gas collecting port to the downstream first air inlet. The downstream first air guiding device is installed on the downstream first gas collecting branch pipe, so that the gas in the downstream first gas collecting branch pipe flows from the downstream first gas collecting port to the gas collecting main pipe. The downstream second air guiding device is installed on the downstream second gas collecting branch pipe, so that the gas in the downstream second gas collecting branch pipe flows from the downstream second gas collecting port to the downstream second air inlet.

In some implementation aspects, the energy-saving air duct system further includes a branch pipe unit and a valve unit. The branch pipe unit includes a first branch pipe, and two ends of the first branch pipe are respectively connected with the downstream first gas collecting branch pipe and the downstream second gas collecting branch pipe. The valve unit includes a first valve and a second valve. The first valve is arranged on the first branch pipe, and the second valve is arranged on the downstream second gas collecting branch pipe. Between the connection of the first branch pipe and the connection of the downstream second gas collecting branch pipe to the downstream second air inlet.

In some embodiments, the energy-saving air duct system further includes an exhaust gas concentration detection unit, the exhaust gas concentration detection unit is installed in one of the gas collecting main pipe, the gas collecting branch pipe unit, and the downstream gas collecting area .

In some embodiments, the energy-saving air duct system further includes a control unit that is electrically connected to the exhaust gas concentration detection unit, the first valve, and the second valve, and can be measured according to the exhaust gas concentration detection unit. The obtained exhaust gas concentration controls the opening and closing states of the first valve and the second valve.

In some embodiments, the downstream gas gathering area further has a downstream third gas inlet and a downstream third gas collector, and the gas gathering branch pipe unit further includes a two ends respectively connected to the downstream third gas inlet and the downstream third gas inlet. The third downstream air collecting branch pipe of the third downstream air collecting port, the air guiding unit further includes a third downstream air guiding device installed on the third downstream air collecting branch, the third downstream air guiding device makes the third downstream air guiding device The gas in the gas collecting branch pipe flows from the downstream third gas collecting port to the downstream third gas inlet.

In some embodiments, the branch pipe unit further includes a second branch pipe connected to the downstream first gas collecting branch pipe and the downstream third gas collecting branch pipe at both ends, and the valve unit further includes a second branch pipe arranged on the second branch pipe. The third valve of the shunt pipe, and a third valve arranged on the downstream third gas collecting branch pipe and located at the junction of the downstream third gas collecting branch pipe to the second shunt pipe and the downstream third gas collecting branch pipe to the downstream third The fourth valve between the connection of the air port.

In some embodiments, the energy-saving air duct system further includes an exhaust gas concentration detection unit and a control unit. The exhaust gas concentration detection unit is installed in the gas collecting main pipe, the gas collecting branch pipe unit, and the downstream gas collecting area. The control unit is electrically connected to the exhaust gas concentration detection unit, the first valve, the second valve, the third valve, and the fourth valve, and can be based on the exhaust gas measured by the exhaust gas concentration detection unit The concentration controls the opening and closing states of the first valve, the second valve, the third valve, and the fourth valve.

The present invention has at least the following effects: the energy-saving air duct system allows the exhaust gas in the upstream gas gathering area and the downstream gas gathering area to be collected and discharged from a single downstream gas collecting branch pipe to the gas collecting main, so that it can effectively control the total collection in the gas collecting main The air volume can save the energy consumption of the exhaust gas purification unit.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers. The first embodiment:

Refer to Fig. 1, which is a first embodiment of the energy-saving air duct system 100 of the present invention. The energy-saving air duct system 100 is installed in an upstream gas gathering area 200 and a downstream gas gathering area 300 that are isolated from each other, and is used to collect and process the process waste gas generated by the upstream gas gathering area 200 and the downstream gas gathering area 300 during product manufacturing. The upstream gas gathering area 200 is, for example, a normal temperature process area such as a coating process, but is not limited to this process, allowing processing personnel to perform process-related operations in the area, and includes an upstream gas gathering port 201 for collecting exhaust gas. The downstream gas gathering area 300 is, for example, a high-temperature process area for a three-stage baking process, but it is not limited to this process. It is divided into a downstream first gas gathering position 301 and a downstream second gas gathering position from right to left. Position 302 and a downstream third gas gathering position 303, the downstream gas gathering area 300 specifically includes a downstream first gas inlet 304, a downstream second gas inlet 305, and a downstream third gas inlet 306 , And a downstream first gas collecting port 307, a downstream second gas collecting port 308, and a downstream third gas collecting port 309 for collecting exhaust gas. The downstream first gas collection port 307, the downstream second gas collection port 308, and the downstream third gas collection port 309 correspond to the downstream first gas collection position 301, the downstream second gas collection position 302, and the downstream third gas collection position 303 regional settings.

The energy-saving air duct system 100 includes an air collecting main pipe 1, an air collecting branch pipe unit 2, an air guiding unit 3 and an exhaust gas purification unit 4.

The gas manifold 1 is the collective discharge place of all process exhaust gases, and is connected to the exhaust gas purification unit 4, and the exhaust gas purification unit 4 performs the purification treatment of the exhaust gas.

The gas gathering branch pipe unit 2 is used to connect the upstream gas gathering port 201 of the upstream gas gathering area 200 and the downstream first gas gathering position 301, the downstream second gas gathering position 302, and the downstream third gas gathering area of the downstream gas gathering area 300. Collecting and diversion of waste gas at locations 303 and other places, specifically including an upstream gas collecting branch pipe 21, a downstream first gas collecting branch pipe 22, a downstream second gas collecting branch pipe 23 and a downstream third gas collecting branch pipe 24 .

The upstream gas-gathering branch pipe 21 extends between the upstream gas-gathering area 200 and the downstream gas-gathering area 300, and its two ends are respectively connected to the upstream gas collecting port 201 and the downstream first gas inlet 304 for providing the upstream gas collecting area. The exhaust gas of the gas zone 200 flows to the downstream gas gathering zone 300 through pipeline channels. Both ends of the downstream first gas gathering branch pipe 22 are respectively connected to the downstream first gas gathering port 307 and the gas gathering main pipe 1, which can provide for the exhaust gas from the upstream gas gathering area 200 and the upstream gas gathering to flow into the downstream gas gathering area 300 The exhaust gas in the area 200 flows to the gas collecting main pipe 1 together to facilitate the control of the total gas collecting air volume in the gas collecting main pipe 1. Two ends of the downstream second gas collecting branch pipe 23 are respectively connected to the downstream second gas collecting port 308 and the downstream second air inlet 305, and both ends of the downstream third gas collecting branch pipe 24 are respectively connected to the downstream third gas collecting port 309 And the downstream third air inlet 306, the downstream second gas collecting branch pipe 23, and the downstream third gas collecting branch pipe 24 so that the exhaust gas collected at the downstream second gas collecting port 308 and the downstream third gas collecting port 309 can be The downstream gas gathering area 300 repeatedly circulates and does not directly flow into the gas gathering main pipe 1, so that the implementation effect of controlling the total gas gathering air volume by the downstream first gas gathering branch pipe 22 can be realized.

The air guide unit 3 is an air extraction device such as a fan, and includes an upstream air guide 31, a downstream first air guide 32, a downstream second air guide 33 and a downstream third air guide 34. The upstream air guiding device 31 is installed in the upstream gas collecting branch pipe 21 adjacent to the upstream gas collecting port 201, so that the gas in the upstream gas collecting branch pipe 21 can flow from the upstream gas collecting port 201 to the downstream first air inlet 304 flow. The downstream first air guiding device 32 is installed in the downstream first gas collecting branch pipe 22 adjacent to the downstream first gas collecting port 307, so that the gas in the downstream first gas collecting branch pipe 22 can pass through the downstream first gas collecting port 307 flows to the gas manifold 1. The downstream second air guiding device 33 is installed in the downstream second gas collecting branch pipe 23 adjacent to the downstream second gas collecting port 308, so that the gas in the downstream second gas collecting branch pipe 23 can pass through the downstream second gas collecting port 308 flows to the second downstream air inlet 305. The third downstream air guiding device 34 is installed at the third downstream gas collecting branch pipe 24 adjacent to the third downstream gas collecting port 309, so that the gas in the third downstream gas collecting branch pipe 24 can pass through the third downstream gas collecting port 309 flows to the third downstream air inlet 306.

Based on the foregoing implementation description, in the first embodiment of the energy-saving air duct system 100, the exhaust gas of the upstream gas gathering area 200 can flow and converge to the downstream gas gathering area 300 by the upstream gas gathering branch pipe 21, and the downstream gas gathering area 300 Although the downstream first gas collecting branch pipe 22, the downstream second gas collecting branch pipe 23, and the downstream third gas collecting branch pipe 24 are set up at the same time, only the downstream first gas collecting branch pipe 22 is The gas collecting main pipe 1 is directly connected, so the exhaust gas at the upstream gas collecting area 200 and the downstream gas collecting area 300 eventually flows into the gas collecting main pipe 1 through the downstream first gas collecting branch pipe 22. Although the embodiment in which the exhaust gas at the upstream gas gathering area 200 and the downstream gas gathering area 300 is concentrated and led out from the downstream first gas collecting branch pipe 22 will lead to an increase in the concentration of exhaust gas finally flowing to the gas collecting main pipe 1, but in the exhaust gas When the concentration does not exceed the lower explosive limit (LEL), in this embodiment, the downstream first gas collecting branch pipe 22 and the downstream first air guiding device 32 can effectively control the total exhaust gas flowing into the gas collecting main pipe 1. Compared with the embodiment in which the first downstream air collecting branch pipe 22, the second downstream air collecting branch pipe 23, and the third downstream air collecting branch pipe 24 are directly connected to the air collecting main pipe 1, the air volume can be effectively reduced. The total collected air volume of the exhaust gas in the gas collecting header 1 can reduce the energy consumption required for the exhaust gas treatment by the exhaust gas purification unit 4 and achieve the purpose of energy saving.

It should be particularly noted that although the present embodiment takes two gas gathering areas such as the upstream gas gathering area 200 and the downstream gas gathering area 300 as an example, the energy-saving air duct system 100 can also be applied to different numbers of gas gathering areas. The gas area, for example, in the implementation state of more than three gas gathering areas, the exhaust gas of all the gas gathering areas can also be respectively led out to a specific by means of an embodiment similar to the upstream gas gathering branch pipe 21 and the upstream air guiding device 31 In the specific gas gathering area where all the exhaust gas is collected, a device similar to the downstream first gas gathering branch pipe 22 and the downstream first air guiding device 32 is installed to converge all the exhaust gas from the gas gathering area to the Collecting main pipe 1, in order to achieve the purpose of total exhaust gas collection air volume control and energy saving. In addition, although the downstream gas gathering area 300 in this embodiment is provided with two downstream gas gathering branch pipes 23, the downstream third gas gathering branch pipe 24, etc., according to actual needs, each gas gathering area The number of the gas collecting branch pipes that are not directly connected to the gas collecting main pipe 1 can be adjusted accordingly, and implemented in a manner similar to the downstream second gas collecting branch pipe 23 and the downstream third gas collecting branch pipe 24 of this embodiment. It is not limited to the content disclosed in this embodiment. The second embodiment:

Refer to FIG. 2, which is a second embodiment of the energy-saving air duct system 100 of the present invention. In the second embodiment, the energy-saving air duct system 100 further includes a shunting pipe unit compared with the first embodiment of FIG. 5 and a valve unit 6 settings.

The branch pipe unit 5 includes a first branch pipe 51 and a second branch pipe 52. The two ends of the first branch pipe 51 are respectively connected to the downstream first gas collecting branch pipe 22 and the downstream second gas collecting branch pipe 23, which can be regarded as branches of the downstream second gas collecting branch pipe 23, so as to selectively provide the downstream The gas in the second gas collecting branch pipe 23 flows to the channel of the downstream first gas collecting branch pipe 22. The two ends of the second shunt pipe 52 are respectively connected to the downstream third gas collecting branch pipe 24 and the downstream first gas collecting branch pipe 22, which can be regarded as branches of the downstream third gas collecting branch pipe 24, so as to selectively supply the The gas in the downstream third gas collecting branch pipe 24 circulates to the downstream first gas collecting branch pipe 22.

The valve unit 6 includes a first valve 61, a second valve 62, a third valve 63 and a fourth valve 64. The first valve 61 is disposed on the first branch pipe 51. The second valve 62 is arranged on the downstream second gas collecting branch pipe 23, and is located at the junction of the downstream second gas collecting branch pipe 23 to the first shunt pipe 51 and the downstream second gas collecting branch pipe 23 to the downstream second branch pipe. Between the connection of the air inlet 305. The third valve 63 is disposed on the second branch pipe 52. The fourth valve 64 is disposed on the downstream third gas collecting branch pipe 24, and is located at the junction of the downstream third gas collecting branch pipe 24 to the second shunt pipe 52 and the downstream third gas collecting branch pipe 24 to the downstream third gas collecting branch pipe. Between the connection of the air inlet 306.

In operation, when the total amount of exhaust gas generated by the upstream gas gathering area 200 and the downstream gas gathering area 300 can be led out to the gas collecting main pipe 1 by the downstream first gas gathering branch pipe 22 alone, without causing the exhaust gas concentration to be too high, The administrator of the energy-saving air duct system 100 can close the first valve 61 and the third valve 63, and leave the second valve 62 and the fourth valve 64 in an open state, so that the first branch pipe 51 and the second valve can be opened. The two shunt pipe 52 is in a closed state, so the energy-saving air duct system 100 can be operated in a manner similar to the first embodiment.

When the total amount of exhaust gas generated in the upstream gas gathering area 200 and the downstream gas gathering area 300 is too large, only the downstream first gas collecting branch pipe 22 to export the exhaust gas to the gas collecting main pipe 1 may cause the exhaust gas concentration to be too high and affect safety In the case of sex, the manager can open one or both of the first valve 61 and the third valve 63, and close one or both of the second valve 62 and the fourth valve 64 as needed, so that Exhaust gas in one or both of the downstream second gas collecting branch pipe 23 and the downstream third gas collecting branch pipe 24 can flow to the downstream first manifold through the first branch pipe 51 and the second branch pipe 52 The air branch pipe 22 finally flows into the gas collecting main pipe 1, so that the total collected air volume of the exhaust gas can be increased to a limited extent to control the exhaust gas concentration within a safe range, and the total collected air volume of the exhaust gas is not too large to maintain the exhaust gas purification unit 4 In the state of energy-saving operation, the purpose of energy saving is realized. The third embodiment:

Refer to FIG. 3, which is a third embodiment of the energy-saving air duct system 100 of the present invention. Most of the implementation details of the third embodiment are the same as the second embodiment in FIG. 2, but compared with the second embodiment, it further includes a Exhaust gas concentration detection unit 7 and a control unit 8. The exhaust gas concentration detection unit 7 is installed in the gas collecting main pipe 1 for detecting the waste gas concentration in the gas collecting main pipe 1. The control unit 8 is electrically connected to the exhaust gas concentration detection unit 7, the first valve 61, the second valve 62, the third valve 63, and the fourth valve 64, so that the control unit 8 can detect the exhaust gas concentration The exhaust gas concentration measured by the measuring unit 7 automatically controls the opening and closing states of the first valve 61, the second valve 62, the third valve 63, and the fourth valve 64 to automatically adjust the exhaust gas concentration and exhaust gas flow rate. It can efficiently assist managers in the management and control of the energy-saving air duct system 100, and achieve the purpose of energy saving.

However, it should be noted that the exhaust gas concentration detection unit 7 can be installed at the gas collecting branch pipe unit 2 or the downstream gas gathering area 300 in addition to the gas collecting main pipe 1 for detecting the exhaust gas concentration. The number of density detecting units 7 can be adjusted according to actual needs, and is not limited to specific implementations.

Based on the description of the foregoing embodiments, the energy-saving air duct system 100 of the present invention allows the exhaust gas of the upstream gas gathering area 200 and the downstream gas gathering area 300 to be collected from a single downstream gas collecting branch (that is, the downstream first gas collecting branch) 22) Discharge to the main gas collecting pipe 1. In this way, the total air volume in the gas collecting main pipe 1 can be effectively controlled, and the energy consumption of the exhaust gas purification unit 4 can be saved, so the purpose of the invention can be achieved.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

100‧‧‧Energy-saving air duct system 1‧‧‧Gas header 2‧‧‧Gas collecting branch unit 21‧‧‧Upstream gas collecting branch 22‧‧‧Downstream first gas collecting branch 23‧‧‧Downstream second gas collecting Branch pipe 24‧‧‧Downstream third air collecting branch pipe 3‧‧‧Air guide unit 31‧‧‧Upstream air guide 32‧‧‧Downstream first air guide 33‧‧‧Downstream second air guide 34‧‧‧ Downstream third air guide device 4‧‧‧Exhaust gas purification unit 5‧‧‧Diversion pipe unit 51‧‧‧First distribution pipe 52‧‧‧Second distribution pipe 6‧‧‧Valve unit 61‧‧‧First valve 62 ‧‧‧Second valve 63‧‧‧Third valve 64‧‧‧Fourth valve7‧‧‧Exhaust gas concentration detection unit8‧‧‧Control unit200‧‧‧Upstream gas gathering area 201‧‧‧Upstream gas gathering port 300‧‧‧Downstream gas gathering area 301‧‧‧Downstream first gas collection position 302‧‧‧Downstream second gas collection position 303‧‧‧Downstream third gas collection position 304‧‧‧Downstream first gas inlet 305‧ ‧‧Downstream second air inlet 306‧‧‧Downstream third air inlet 307‧‧‧Downstream first gas collection port 308‧‧‧Downstream second gas collection port 309‧‧‧Downstream third gas collection port

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a schematic diagram illustrating the first embodiment of the energy-saving air duct system of the present invention; Figure 2 is a schematic diagram illustrating The second embodiment of the energy-saving air duct system; and FIG. 3 is a schematic diagram illustrating the third embodiment of the energy-saving air duct system.

100‧‧‧Energy-saving air duct system

1‧‧‧Gas manifold

2‧‧‧Air Gathering Branch Unit

21‧‧‧Upstream gas gathering branch

22‧‧‧The first downstream gas manifold

23‧‧‧Second downstream gas manifold

24‧‧‧The third downstream gas manifold

3‧‧‧Air guide unit

31‧‧‧Upstream wind guide

32‧‧‧The first downstream air guiding device

33‧‧‧The second downstream air guide device

34‧‧‧The third downstream air guide

4‧‧‧Exhaust gas purification unit

200‧‧‧Upstream gas gathering area

201‧‧‧Upstream gas gathering port

300‧‧‧Downstream gas gathering area

301‧‧‧The first gas gathering location downstream

302‧‧‧The second downstream gas gathering location

303‧‧‧Downstream third gas gathering location

304‧‧‧Downstream first air inlet

305‧‧‧Second downstream air inlet

306‧‧‧Downstream third air inlet

307‧‧‧The first air collection port downstream

308‧‧‧The second downstream air collection port

309‧‧‧Downstream third gas collection port

Claims (7)

An energy-saving air duct system is installed in an upstream gas gathering area and a downstream gas gathering area that are isolated from each other. The upstream gas gathering area has an upstream gas gathering port, the downstream gas gathering area is divided into a plurality of gas gathering positions, and the downstream The gas gathering area has a downstream first air inlet and a downstream second air inlet located at different gas gathering positions, and a downstream first air gathering port and a downstream second air gathering port located at different air gathering positions. The pipe system includes: a gas collecting main pipe; an exhaust gas purification unit arranged in the gas collecting main pipe; a gas collecting branch pipe unit including an upstream gas collecting branch pipe, two ends respectively connected to the upstream gas collecting port and the downstream first air inlet , A downstream first gas collecting branch pipe, both ends of which are respectively connected to the downstream first gas collecting port and the gas collecting main pipe, and a downstream second gas collecting branch pipe, both ends are respectively connected to the downstream second gas collecting port and the downstream second inlet Air port; and an air guiding unit, including an upstream air guiding device installed in the upstream gas collecting branch pipe, so that the gas in the upstream gas collecting branch pipe flows from the upstream gas collecting port to the downstream first air inlet, one The downstream first air guiding device is installed in the downstream first gas collecting branch pipe so that the gas in the downstream first gas collecting branch pipe flows from the downstream first gas collecting port to the gas collecting main pipe, and a downstream second air guiding device The device is installed in the second downstream gas collecting branch pipe so that the gas in the second downstream gas collecting branch pipe flows from the second downstream gas collecting port to the second downstream gas inlet. The energy-saving air duct system according to claim 1, further comprising: a branch pipe unit, including a first branch pipe, two ends of the first branch pipe are respectively connected to the downstream first gas collecting branch pipe and the downstream second branch pipe Air branch pipe; and a valve unit, including a first valve and a second valve, the first valve is arranged in the first branch pipe, the second valve is arranged in the downstream second gas collecting branch and located in the downstream second Between the connection of the gas collecting branch pipe to the first shunt pipe and the connection of the downstream second gas collecting branch pipe to the downstream second air inlet. The energy-saving air duct system according to claim 2, further comprising an exhaust gas concentration detection unit, the exhaust gas concentration detection unit being disposed at one of the gas collecting main pipe, the gas collecting branch pipe unit, and the downstream gas collecting area. The energy-saving air duct system according to claim 3, further comprising a control unit which is electrically connected to the exhaust gas concentration detection unit, the first valve and the second valve, and can be measured according to the exhaust gas concentration detection unit The obtained exhaust gas concentration controls the opening and closing states of the first valve and the second valve. The energy-saving air duct system according to claim 1, wherein the downstream gas gathering area further has a downstream third gas inlet and a downstream third gas gathering port, and the gas gathering branch pipe unit further includes a two ends respectively connected to the downstream The third air inlet and the downstream third air collecting branch pipe of the downstream third air collecting port, the air guiding unit further includes a downstream third air guiding device installed on the downstream third air collecting branch, the downstream third air guiding device The wind device makes the gas in the third downstream gas collecting branch flow from the third downstream gas collecting port to the third downstream gas inlet. The energy-saving air duct system according to claim 5, wherein the branch pipe unit further includes a second branch pipe connected at both ends of the downstream first gas collecting branch pipe and the downstream third gas collecting branch pipe, the valve unit also It includes a third valve arranged on the second branch pipe, and a third gas collecting branch pipe arranged on the downstream and located in the downstream third gas collecting branch pipe to the second branch pipe. The fourth valve between the connection of the flow pipe and the connection of the downstream third gas collecting branch pipe to the downstream third air inlet. The energy-saving air duct system according to claim 6, further comprising an exhaust gas concentration detection unit and a control unit, and the exhaust gas concentration detection unit is installed in the gas collecting main pipe, the gas collecting branch pipe unit, and the downstream gas collecting area The control unit is electrically connected to the exhaust gas concentration detection unit, the first valve, the second valve, the third valve, and the fourth valve, and can be based on the exhaust gas measured by the exhaust gas concentration detection unit The concentration controls the opening and closing states of the first valve, the second valve, the third valve, and the fourth valve.

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