A mixed-flow exhaust fan

Abstract

The present invention belongs to the technical field of fans, and specifically provides a mixed flow exhaust fan, including a main air inlet box, a bypass air inlet box, a gas delivery mechanism, a gas volume adjustment mechanism and a first mixing and collecting mechanism; the air inlet of the main air inlet box is connected to the exhaust gas discharge port; the bypass air inlet box is arranged on one side of the main air inlet box, and the exhaust port of the bypass air inlet box is connected to the main air inlet box; one end of the gas delivery mechanism is connected to the exhaust port of the main air inlet box; the connection between the bypass air inlet box and the main air inlet box, and the connection between the gas delivery mechanism and the main air inlet box are both provided with a gas volume adjustment mechanism; the first mixing and collecting mechanism includes a guide cone sleeve and a guide cone, a support plate is arranged between the guide cone sleeve and the gas delivery mechanism, and a first gas collection port is formed between the guide cone sleeve and the gas delivery mechanism through the support plate. Through the mixing of external gas and exhaust gas, the concentration of the discharged exhaust gas is reduced, thereby reducing the cost of construction and maintenance, and meeting environmental protection requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to an axial-flow exhaust fan. Background Art

[0002] In a laboratory, various harmful waste gases are generated during experimental operations. These waste gases are usually discharged to the outside through chimneys / discharge ports, etc. According to environmental protection regulations and other requirements, the discharge of harmful waste gases requires the chimney / discharge port to be set at a certain height to promote better mixing of the waste gases with the atmosphere and reduce the direct negative impact on the ground and nearby areas. At the same time, this helps to ensure that the waste gases are sufficiently diluted and diffused before reaching the ground, reducing the potential risks to the surrounding population and environment. However, setting the chimney / discharge port at a certain height will increase the construction and maintenance costs, as well as potentially require more technical support and manpower input. Therefore, while meeting environmental protection requirements, it is also necessary to balance economic and technical feasibility.

[0003] Based on this, the present invention proposes an axial-flow exhaust fan to solve the above problems. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an axial-flow exhaust fan to solve the problems in the prior art.

[0005] One embodiment of the present invention provides an axial-flow exhaust fan, including:

[0006] A main air inlet box, the main air inlet box having an air inlet and an air outlet, and the air inlet of the main air inlet box being connected to the waste gas discharge port;

[0007] A bypass air inlet box, the bypass air inlet box having an air inlet and an air outlet, the bypass air inlet box being provided on one side of the main air inlet box, and the air outlet of the bypass air inlet box being connected to the main air inlet box;

[0008] A gas conveying mechanism, one end of the gas conveying mechanism being connected to the air outlet of the main air inlet box;

[0009] An air volume regulating mechanism, an air volume regulating mechanism being provided at the connection between the bypass air inlet box and the main air inlet box, and at the connection between the gas conveying mechanism and the main air inlet box;

[0010] A first mixing and collecting mechanism, the first mixing and collecting mechanism being provided at the end of the gas conveying mechanism away from the main air inlet box, and the first mixing and collecting mechanism and the gas conveying mechanism being on the same axis;

[0011] Wherein, the first mixing and collecting mechanism includes a guide cone sleeve and a guide cone body, the guide cone body being arranged inside the guide cone sleeve, and both being on the same axis;

[0012] A plurality of support plates distributed at equal intervals are arranged between the guide cone sleeve and the gas delivery mechanism, the guide cone sleeve is supported on the gas delivery mechanism by the support plates, and a first gas collecting port is formed between the guide cone sleeve and the gas delivery mechanism through the support plates;

[0013] The diameter of the guide cone sleeve at one end close to the gas conveying mechanism is larger than the diameter of the gas conveying mechanism.

[0014] In one embodiment, the guide cone includes an upper cone and a lower cone;

[0015] The diameter of the upper cone increases from top to bottom, and the diameter of the lower cone increases from bottom to top. The large-diameter end faces of the upper cone and the lower cone have the same diameter and are fixedly connected to each other.

[0016] A connecting component is provided at the connection between the upper cone and the lower cone, and the upper cone and the lower cone are fixedly connected to the inner side surface of the guide cone sleeve through the connecting component.

[0017] In one embodiment, the height of the upper cone is greater than the height of the lower cone.

[0018] In one of the embodiments, a protective plate is provided at the air inlet of the bypass air inlet box.

[0019] In one embodiment, the gas volume regulating mechanism includes a shutter regulating plate, a rotating shaft and a controller, one end of the rotating shaft is rotatably connected to the shutter regulating plate, and the other end is connected to the controller;

[0020] The controller drives the rotating shaft to rotate to drive the opening and closing degree of the shutter adjustment plate to adjust the air intake volume of the main air intake box and the bypass air intake box.

[0021] In one embodiment, the gas delivery mechanism includes a cover plate, a gas delivery housing, a drive motor and an impeller;

[0022] The cover plate is installed on the end surface of the main air intake box having an exhaust port, the cover plate is provided with an air inlet, and the cover plate is connected with the exhaust port of the main air intake box through the air inlet;

[0023] The gas delivery housing is mounted on the cover plate to surround the air inlet of the cover plate, and the gas delivery housing and the air inlet of the cover plate are located on the same axis;

[0024] A support core is provided inside the gas delivery housing, the support core and the gas delivery housing are at the same center, and a gas delivery channel is formed between the outer side of the support core and the inner side of the gas delivery housing;

[0025] An arc-shaped guide vane is provided between the outer side surface of the support core tube and the inner side surface of the gas delivery housing, and the support core tube is suspended inside the gas delivery housing through the arc-shaped guide vane;

[0026] The impeller is installed on the air inlet of the cover plate, the driving motor is installed inside the support core tube, and the output shaft of the driving motor passes through the support core tube and is connected to the impeller to drive the impeller to rotate.

[0027] In one embodiment, the support plate is fixed to one end of the gas delivery housing away from the cover plate;

[0028] The diameter of one end of the flow guiding cone sleeve close to the gas delivery housing is larger than the diameter of one end of the gas delivery housing away from the cover plate, so as to form a first gas collecting port between the support plate, the flow guiding cone sleeve and the gas delivery housing.

[0029] In one embodiment, the flow guiding cone sleeve includes an upper part and a lower part, and a second gas collecting port is formed between the upper part and the lower part of the flow guiding cone sleeve;

[0030] A plurality of second mixing and collecting mechanisms arranged in a circumferential array around the center of the flow guiding cone sleeve are provided at the second gas collecting port formed between the upper part and the lower part of the flow guiding cone sleeve;

[0031] The tops of a plurality of the second mixing and collecting mechanisms are slidably connected to the upper part of the flow guiding cone sleeve, and the bottoms of a plurality of the second mixing and collecting mechanisms are flush with the connection point between the upper cone and the lower cone.

[0032] In one embodiment, a single second mixing and collecting mechanism includes a guide vane and a pulley, and the pulley is installed at the top of the guide vane;

[0033] An extension plate is provided on the inner side surface of the upper part of the flow guiding cone sleeve, an arc-shaped sliding groove is provided on the bottom surface of the extension plate, the guide vane is installed on the bottom surface of the extension plate, and the pulley is slidably installed in the arc-shaped sliding groove.

[0034] The mixed-flow exhaust fan provided by the above embodiments has the following beneficial effects:

[0035] 1. The exhaust gas to be discharged is input through the connection between the main air intake box and the exhaust gas discharge port, and the external gas is input through the bypass air intake box to mix with the exhaust gas in the main air intake box to reduce the concentration of the exhaust gas, and the mixed gas is accelerated and rotated by the gas conveying mechanism, so that the mixed gas flows into the guide cone sleeve of the first mixing and collecting mechanism with a certain flow rate, and due to the effect of the guide cone, the external gas will be driven to be sucked into the guide cone sleeve from the first gas collecting port, so that the mixed gas is mixed with the external gas again, and the concentration of the exhaust gas is further reduced. Through the effect of double dilution, the concentration of harmful exhaust gas is reduced before being discharged, and the discharged exhaust gas has a certain flow rate, which helps to ensure that the exhaust gas is sufficiently diluted and diffused before reaching the ground, reducing the potential risk to the surrounding people and the environment. Therefore, the height of the chimney / exhaust port can be reduced, so that while meeting environmental protection requirements, the cost of construction and maintenance is also reduced accordingly.

[0036] 2. When further mixing the mixed gas with the external gas to reduce the concentration of the exhaust gas, no additional power is required. When the mixed gas with a certain flow rate flows into the guide cone sleeve of the first mixing and collecting mechanism, the external gas will be sucked into the guide cone sleeve from the first gas collecting port under the action of the guide cone, thereby achieving energy-saving effect.

[0037] 3. Furthermore, the arc guide vanes increase the rotation speed of the gas when the mixed gas is transported to the first mixing and collecting mechanism, so that the flow rate of the mixed gas increases, thereby increasing the suction force at the first gas collecting port, thereby increasing the amount of external gas entering the guide cone sleeve from the first gas collecting port.

[0038] 4. The mixed gas is further mixed with the external gas through the second mixing and collecting mechanism to reduce the concentration of the exhaust gas. The driving of the second mixing and collecting mechanism does not require additional power, which can increase the exhaust gas dilution effect while achieving energy saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the overall structure of a mixed flow exhaust fan provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the internal structure of a mixed flow exhaust fan provided by an embodiment of the present invention;

[0042] Figure 3 Schematic structural diagram of the gas conveying mechanism of the mixed-flow exhaust fan provided by the embodiment of the present invention;

[0043] Figure 4 Internal structural diagram of the gas conveying mechanism of the mixed-flow exhaust fan provided by the embodiment of the present invention;

[0044] Figure 5 Schematic structural diagram of the first mixing and collecting mechanism of the mixed-flow exhaust fan provided by the embodiment of the present invention;

[0045] Figure 6 Schematic diagram of the gas flow direction of the mixed-flow exhaust fan provided by the embodiment of the present invention;

[0046] Figure 7 Schematic diagram of the second mixing and collecting mechanism of the mixed-flow exhaust fan provided by the embodiment of the present invention;

[0047] Figure 8 Schematic diagram of the position of the second mixing and collecting mechanism of the mixed-flow exhaust fan provided by the embodiment of the present invention.

[0048] Reference numerals in the drawings:

[0049] 100, main air inlet box; 200, bypass air inlet box; 210, protective plate; 300, gas conveying mechanism; 310, cover plate; 311, air inlet; 320, gas conveying housing; 330, drive motor; 340, impeller; 350, support core tube; 360, gas conveying channel; 370, arc guide vane; 400, air volume adjustment mechanism; 410, louver adjustment plate; 420, rotating shaft; 430, controller; 500, first mixing and collecting mechanism; 510, guide cone sleeve; 511, upper part; 512, lower part; 513, second gas collecting port; 514, extension plate; 520, guide cone body; 521, upper cone; 522, lower cone; 530, connecting component; 600, support plate; 700, first gas collecting port; 800, second mixing and collecting mechanism; 810, guide vane; 820, pulley. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0052] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] Referring to Figures 1 - 6 , one embodiment of the present invention provides a mixed-flow exhaust fan, including:

[0054] A main intake box 100, the main intake box 100 having an air inlet and an air outlet, and the air inlet of the main intake box 100 being in communication with an exhaust gas discharge port;

[0055] A bypass intake box 200, the bypass intake box 200 having an air inlet and an air outlet, the bypass intake box 200 being provided on one side of the main intake box 100, and the air outlet of the bypass intake box 200 being in communication with the main intake box 100;

[0056] A gas conveying mechanism 300, one end of the gas conveying mechanism 300 being in communication with the air outlet of the main intake box 100;

[0057] An air volume adjustment mechanism 400, the air volume adjustment mechanism 400 being provided at the connection between the bypass intake box 200 and the main intake box 100, and at the connection between the gas conveying mechanism 300 and the main intake box 100;

[0058] A first mixing and collecting mechanism 500, the first mixing and collecting mechanism 500 being provided at the end of the gas conveying mechanism 300 away from the main intake box 100, and the first mixing and collecting mechanism 500 and the gas conveying mechanism 300 being on the same axis;

[0059] The first mixing and collecting mechanism 500 includes a guide cone sleeve 510 and a guide cone 520. The guide cone 520 is arranged inside the guide cone sleeve 510, and the two are located at the same axis.

[0060] A plurality of support plates 600 are arranged between the guide cone sleeve 510 and the gas delivery mechanism 300 at equal intervals, and the guide cone sleeve 510 is supported on the gas delivery mechanism 300 by the support plates 600, and a first gas manifold 700 is formed between the guide cone sleeve 510 and the gas delivery mechanism 300 by the support plates 600;

[0061] The diameter of the guide cone sleeve 510 at one end close to the gas delivery mechanism 300 is larger than the diameter of the gas delivery mechanism 300 .

[0062] In this embodiment, the main air intake box 100 is used to input the discharged exhaust gas; the bypass air intake box 200 is used to input external gas into the main air intake box 100 through a fan or the like to mix with the exhaust gas to reduce / dilute the concentration of the exhaust gas; the gas conveying mechanism 300 is used to convey the mixed exhaust gas, and is used to accelerate and rotate the mixed exhaust gas so that the mixed gas flows into the first mixing and collecting mechanism 500 with a certain flow rate; the gas volume regulating mechanism 400 is used to adjust the intake volume of the mixed gas entering the gas conveying mechanism 300 from the main air intake box 100 and to adjust the intake volume of the external gas entering the main air intake box 100 from the bypass air intake box 200; the first gas mixing and collecting mechanism is used to mix the exhaust gas with the external gas again to reduce / dilute the concentration of the exhaust gas, so as to achieve the effect of double dilution of the exhaust gas.

[0063] Specifically, refer to Figure 1 , Figure 2, one end of the main intake box 100 is the air inlet, and the opposite end is the exhaust port. The air inlet of the main intake box 100 is connected to the chimney / discharge port of the laboratory, and the waste gas generated during the experiment operation directly enters the main intake box 100 through the chimney / discharge port. One end of the bypass intake box 200 is the air inlet, and the opposite end is the exhaust port. The bypass intake box 200 is arranged on the side of the main intake box 100, and the exhaust port of the bypass intake box 200 is communicated with the side of the main intake box 100. A gas volume regulating mechanism 400 is arranged at the connection between the bypass intake box 200 and the main intake box 100. The opening degree between the two is adjusted through the gas volume regulating mechanism 400 to achieve the purpose of controlling the intake air volume. The air inlet of the bypass intake box 200 is connected to a fan (not shown in the figure) and the like. The outside air is input through the fan and enters the inside of the main intake box 100 from the exhaust port of the bypass intake box 200 to be mixed with the waste gas, so as to reduce / dilute the concentration of the waste gas. One end of the gas conveying mechanism 300 is communicated with the exhaust port of the main intake box 100, and a gas volume regulating mechanism 400 is also arranged at the connection between the two. The opening degree between the two is adjusted through the gas volume regulating mechanism 400 to achieve the purpose of controlling the intake air volume (the mixed gas entering the gas conveying mechanism 300). After the mixed gas enters the gas conveying mechanism 300, the gas conveying mechanism 300 accelerates and rotates the mixed gas, so that the mixed gas flows into the first mixing and collecting mechanism 500 with a certain flow rate. The first mixing and collecting mechanism 500 is composed of a guide cone sleeve 510 and a guide cone body 520. The guide cone sleeve 510 is installed at the end of the gas conveying mechanism 300 far away from the main intake box 100, and the guide cone sleeve 510 and the gas conveying mechanism 300 are on the same axis. Moreover, the diameter of the end of the guide cone sleeve 510 close to the gas conveying mechanism 300 is larger than the diameter of the gas conveying mechanism 300, so that the gas conveying mechanism 300 can completely input the mixed gas into the guide cone sleeve 510. A number of support plates 600 are arranged at equal intervals between the guide cone sleeve 510 and the gas conveying mechanism 300. The guide cone sleeve 510 is supported on the gas conveying mechanism 300 through the support plates 600, and a first gas collecting port 700 is formed between the guide cone sleeve 510 and the gas conveying mechanism 300 through the support plates 600.The flow guiding cone 520 is arranged inside the flow guiding cone sleeve 510 and is coaxial with the flow guiding cone sleeve 510 and the gas conveying mechanism 300. Through this design, the mixed gas input into the interior of the flow guiding cone sleeve 510 will first be rebounded by the flow guiding cone 520 and spread around, and the mixed gas will evenly flow along the conical surface of the flow guiding cone 520 towards the other end (discharge) of the flow guiding cone sleeve 510; since the mixed gas input into the flow guiding cone sleeve 510 has a certain flow rate, under the action of the flow guiding cone 520, a relatively large suction force will be generated at the first gas collecting port 700 formed between the flow guiding cone sleeve 510 and the gas conveying mechanism 300, and the outside gas will be driven to be sucked into the flow guiding cone sleeve 510 from the first gas collecting port 700 by the suction force, as Figure 6 shown, so that the mixed gas is mixed with the outside gas again, further reducing the concentration of the waste gas. Through the effect of double dilution, the concentration of the harmful waste gas is reduced multiple times and then discharged from the other end of the flow guiding cone sleeve 510.

[0064] In this embodiment, the waste gas discharged is input by connecting the main air inlet box 100 with the waste gas discharge port, and the outside gas is input through the bypass air inlet box 200 to be mixed with the waste gas in the main air inlet box 100 to reduce the concentration of the waste gas. And the mixed gas is accelerated and rotated by the gas conveying mechanism 300, so that the mixed gas flows into the flow guiding cone sleeve 510 of the first mixing and collecting mechanism 500 with a certain flow rate. And due to the action of the flow guiding cone 520, the outside gas will be driven to be sucked into the flow guiding cone sleeve 510 from the first gas collecting port 700, so that the mixed gas is mixed with the outside gas again, further reducing the concentration of the waste gas. Through the effect of double dilution, the concentration of the harmful waste gas is reduced and then discharged, and the discharged waste gas has a certain flow rate, which helps to ensure that the waste gas is sufficiently diluted and diffused before reaching the ground, reducing the potential risks to the surrounding people and the environment. Therefore, the height of the chimney / discharge port can be reduced, and accordingly, the construction and maintenance costs are also reduced while meeting the environmental protection requirements.

[0065] In one of the embodiments, the flow guiding cone 520 includes an upper cone 521 and a lower cone 522;

[0066] The diameter of the upper cone 521 increases from top to bottom, the diameter of the lower cone 522 increases from bottom to top, and the large-diameter end face diameters of the upper cone 521 and the lower cone 522 are the same and are fixedly connected to each other;

[0067] A connecting member 530 is arranged at the connection between the upper cone 521 and the lower cone 522, and the upper cone 521 and the lower cone 522 are fixedly connected to the inner side surface of the flow guiding cone sleeve 510 through the connecting member 530.

[0068] In this embodiment, with reference to Figure 2Specifically, the guide cone 520 is composed of two cones, including an upper cone 521 and a lower cone 522. The upper cone 521 and the lower cone 522 are fixedly connected to the inner side of the guide cone sleeve 510 through a connecting component 530. The connecting component 530 can be a connecting plate, a connecting rod or other structures. Through the design of the upper cone 521 and the lower cone 522, when the gas conveying mechanism 300 inputs the mixed gas into the guide cone sleeve 510, it will first be blocked by the conical surface of the lower cone 522 and rebound to spread around. Due to the continuous input of the mixed gas, the mixed gas will flow along the conical surface of the lower cone 522 to the upper cone 521; and due to the continuous input of the mixed gas and under the action of the conical surface of the lower cone 522, a large suction force will be generated at the first gas collecting port 700, and the suction force will drive the external gas to be sucked into the guide cone sleeve 510 from the first gas collecting port 700, and follow the mixed gas along the conical surface of the lower cone 522 to flow to the upper cone 521. When the mixed gas passes through the connection point between the upper cone 521 and the lower cone 522, the flow velocity will increase, so that the discharged exhaust gas has a certain flow velocity, which helps to ensure that the exhaust gas is sufficiently diluted and diffused before reaching the ground.

[0069] In one embodiment, the height of the upper cone 521 is greater than the height of the lower cone 522 .

[0070] In this embodiment, refer to Figure 2 The height of the upper cone 521 is greater than the height of the lower cone 522, that is, the slope of the lower cone 522 is greater than the slope of the upper cone 521. The slope of the lower cone 522 can be adjusted within the range of 25 to 45 degrees according to the situation. When the slope of the lower cone 522 is smaller, the suction force generated at the first gas collecting port 700 will be greater, and the flow rate of the corresponding mixed gas will increase.

[0071] In one embodiment, a protective plate 210 is provided at the air inlet of the bypass air inlet box 200 .

[0072] In this embodiment, the protective plate 210 provided in the bypass air intake box 200 is used to prevent debris, rainwater, etc. from entering the interior.

[0073] In one embodiment, the air volume regulating mechanism 400 includes a shutter regulating plate 410, a rotating shaft 420 and a controller 430, wherein one end of the rotating shaft 420 is rotatably connected to the shutter regulating plate 410, and the other end is connected to the controller 430;

[0074] The controller 430 drives the rotating shaft 420 to rotate and drives the shutter adjustment plate 410 to open or close, so as to adjust the air intake amount of the main air intake box 100 and the bypass air intake box 200 .

[0075] In this embodiment, refer to Figure 1 ,Figure 2 The air volume regulating mechanism 400 is composed of a louver adjusting plate 410, a rotating shaft 420 and a controller 430. The rotating shaft 420 is arranged on the louver adjusting plate 410. The opening and closing degree of the louver adjusting plate 410 is driven by the rotation of the rotating shaft 420. The driving of the rotating shaft 420 is controlled by the controller 430. The controller 430, the rotating shaft 420 and the louver adjusting plate 410 are structures well known to those skilled in the art, so they are not described in detail.

[0076] In one embodiment, the gas delivery mechanism 300 includes a cover plate 310, a gas delivery housing 320, a drive motor 330, and an impeller 340;

[0077] The cover plate 310 is installed on the end surface of the main air intake box 100 having the exhaust port, and the cover plate 310 is provided with an air inlet 311, and the cover plate 310 is connected with the exhaust port of the main air intake box 100 through the air inlet 311;

[0078] The gas delivery housing 320 is installed on the cover plate 310 to surround the air inlet 311 of the cover plate 310, and the gas delivery housing 320 and the air inlet 311 of the cover plate 310 are located at the same axis;

[0079] A support core 350 is disposed inside the gas delivery housing 320. The support core 350 and the gas delivery housing 320 are at the same center of a circle, and a gas delivery channel 360 is formed between the outer side of the support core 350 and the inner side of the gas delivery housing 320.

[0080] A circular arc guide vane 370 is provided between the outer side surface of the support core barrel 350 and the inner side surface of the gas delivery housing 320, and the support core barrel 350 is suspended and arranged inside the gas delivery housing 320 by the circular arc guide vane 370;

[0081] The impeller 340 is installed on the air inlet 311 of the cover plate 310, the drive motor 330 is installed inside the support core barrel 350, and the output shaft of the drive motor 330 passes through the support core barrel 350 and is connected to the impeller 340 for driving the impeller 340 to rotate.

[0082] In this embodiment, refer to Figures 2 - 4, the gas delivery mechanism 300 is composed of a cover plate 310, a gas delivery housing 320, a drive motor 330, and an impeller 340; a circular air inlet 311 is provided in the middle of the cover plate 310. The cover plate 310 is installed on the end face of the main air intake box 100 having an exhaust port and is connected to the exhaust port of the main air intake box 100 through the air inlet 311. The gas delivery housing 320 is designed in a cylindrical shape and sleeved on the cover plate 310. A cylindrical support core tube 350 is provided inside the gas delivery housing 320. A gas delivery channel 360 is formed between the outer side surface of the support core tube 350 and the inner side surface of the gas delivery housing 320. Both the gas delivery housing 320 and the support core tube 350 are coaxially arranged with the air inlet 311 of the cover plate 310, so that the mixed gas in the main air intake box 100 can enter the gas delivery channel 360 evenly from the air inlet 311 through the exhaust port. The drive motor 330 is installed inside the support core tube 350, and its output shaft passes through the support core tube 350 and is connected to the impeller 340. The impeller 340 is of a backward-curved blade type. The impeller 340 is installed on the air inlet 311, and the drive motor 330 is used to drive the impeller 340 to rotate, thereby sucking the mixed gas in the main air intake box 100 into the gas delivery channel 360.

[0083] A number of twisted arc guide vanes 370 are provided at the middle position of the gas delivery channel 360. The number of arc guide vanes 370 is arranged in a circumferential array with the axis of the support core tube 350 as the center. The support core tube 350 is suspended inside the gas delivery housing 320 through the provided arc guide vanes 370. The design of the twisted arc guide vanes 370 is used to support the support core tube 350 as a support component, and at the same time, when the mixed gas is transported to the flow guide cone sleeve 510, the mixed gas will flow along the twisted direction of the arc guide vanes 370, thereby increasing the rotational speed of the gas, increasing the flow rate of the mixed gas, increasing the suction at the first gas collecting port 700, and further increasing the amount of external gas entering the flow guide cone sleeve 510 from the first gas collecting port 700.

[0084] In one embodiment, the support plate 600 is fixed to one end of the gas delivery housing 320 away from the cover plate 310;

[0085] The diameter of one end of the flow guide cone sleeve 510 close to the gas delivery housing 320 is larger than the diameter of one end of the gas delivery housing 320 away from the cover plate 310, so as to form a first gas collecting port 700 between the flow guide cone sleeve 510 and the gas delivery housing 320 through the support plate 600.

[0086] In this embodiment, since the diameter of the end of the flow guiding cone sleeve 510 close to the gas delivery housing 320 is larger than the diameter of the end of the gas delivery housing 320 away from the cover plate 310, the gas delivery housing 320 can completely input the mixed gas into the flow guiding cone sleeve 510, and a first gas collecting port 700 is formed between the flow guiding cone sleeve 510 and the gas delivery housing 320 through the support plate 600.

[0087] In one embodiment, the flow guiding cone sleeve 510 includes an upper part 511 and a lower part 512, and a second gas collecting port 513 is formed between the upper part 511 and the lower part 512 of the flow guiding cone sleeve 510;

[0088] A plurality of second mixing and collecting mechanisms 800 arranged in a circumferential array around the center of the flow guiding cone sleeve 510 are provided at the second gas collecting port 513 formed between the upper part 511 and the lower part 512 of the flow guiding cone sleeve 510;

[0089] The tops of the plurality of second mixing and collecting mechanisms 800 are slidably connected to the upper part 511 of the flow guiding cone sleeve 510, and the bottoms of the plurality of second mixing and collecting mechanisms 800 are flush with the connection point between the upper cone 521 and the lower cone 522.

[0090] A single second mixing and collecting mechanism 800 includes a flow guiding blade 810 and a pulley 820, and the pulley 820 is installed at the top of the flow guiding blade 810;

[0091] An extension plate 514 is provided on the inner side surface of the upper part 511 of the flow guiding cone sleeve 510. An arc-shaped chute is provided on the bottom surface of the extension plate 514. The flow guiding blade 810 is installed on the bottom surface of the extension plate 514, and the pulley 820 is slidably installed in the arc-shaped chute.

[0092] In this embodiment, as Figure 7 、 Figure 8 shown, further, the flow guiding cone sleeve 510 includes an upper part 511 and a lower part 512. A second gas collecting port 513 is formed between the upper part 511 and the lower part 512 of the flow guiding cone sleeve 510, and a plurality of second mixing and collecting mechanisms 800 arranged in a circumferential array with the center of the flow guiding cone sleeve 510 at the second gas collecting port 513. In this embodiment, the second mixing and collecting mechanisms 800 are at least four, and the four second mixing and collecting mechanisms 800 are connected end to end, as Figure 8As shown in the figure, it is a schematic diagram of the position of the second mixed current collector mechanism 800. The structure of each second mixed current collector mechanism 800 is the same, and it is composed of a guide vane 810 and a pulley 820. The pulleys 820 are arranged on both sides of the top of the guide vane 810. An extension plate 514 is provided on the inner side of the upper part 511 of the guide cone sleeve 510. An arc-shaped chute is provided on the bottom surface of the extension plate 514. The guide vane 810 is installed on the bottom surface of the extension plate 514 through the pulley 820. The pulley 820 is installed in the arc-shaped chute. The bottom end of the guide vane 810 is flush with the connection point between the upper cone 521 and the lower cone 522. Since the flow rate of the mixed gas will increase after passing through the connection point between the upper cone 521 and the lower cone 522, through this design method, when the mixed gas passes through the connection point between the upper cone 521 and the lower cone 522, it will blow each guide vane 810 to slide on the arc-shaped chute of the extension plate 514 and rotate around the upper cone (the guide vane 810 is similar to a fan blade and has the same function as a fan blade). During the rotation process, a certain suction force is generated at the second gas current collector port 513. Through the suction force, the external gas is driven to be inhaled into the guide cone sleeve 510 from the second gas current collector port 513 and mixed with the mixed gas again to reduce the concentration of the waste gas. In this embodiment, the second mixed current collector mechanism 800 is used to further mix the mixed gas with the external gas to reduce the concentration of the waste gas. And the drive of the second mixed current collector mechanism 800 does not require additional power supply. While achieving the energy-saving effect, it can also increase the waste gas dilution effect; and in this embodiment, the structure of the second mixed current collector mechanism 800 is simple, so the cost is also reduced. A good dilution effect can be achieved through low cost.

[0093] As needed, the above-mentioned installation, setting, providing or connecting methods include but are not limited to installation, setting or connection by means such as screws, riveting, welding or socketing, fixing, etc., and the installation, setting or connection method is selected according to the working scenario requirements.

[0094] The above is only the preferred embodiment of the present invention, and it does not limit the patent scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mixed flow exhaust fan, characterized in that: include: A main air intake box (100), the main air intake box (100) having an air intake port and an exhaust port, the air intake port of the main air intake box (100) being in communication with the exhaust gas exhaust port; A bypass air intake box (200), the bypass air intake box (200) having an air intake port and an air exhaust port, the bypass air intake box (200) being arranged on one side of the main air intake box (100), and the exhaust port of the bypass air intake box (200) being connected to the main air intake box (100); A gas delivery mechanism (300), one end of the gas delivery mechanism (300) being in communication with an exhaust port of the main air intake box (100); An air volume regulating mechanism (400), wherein the connection between the bypass air intake box (200) and the main air intake box (100), and the connection between the gas delivery mechanism (300) and the main air intake box (100) are both provided with an air volume regulating mechanism (400); A first mixing and collecting mechanism (500), the first mixing and collecting mechanism (500) being arranged at one end of the gas delivery mechanism (300) away from the main air inlet box (100), and the first mixing and collecting mechanism (500) and the gas delivery mechanism (300) being located at the same axis; The first mixing and collecting mechanism (500) comprises a guide cone sleeve (510) and a guide cone (520), wherein the guide cone (520) is arranged inside the guide cone sleeve (510), and the two are located on the same axis; A plurality of support plates (600) distributed at equal intervals are provided between the guide cone sleeve (510) and the gas delivery mechanism (300); the guide cone sleeve (510) is supported on the gas delivery mechanism (300) by the support plates (600); and a first gas collecting port (700) is formed between the guide cone sleeve (510) and the gas delivery mechanism (300) by the support plates (600); The diameter of the guide cone sleeve (510) at one end close to the gas delivery mechanism (300) is larger than the diameter of the gas delivery mechanism (300); Wherein, the guide cone (520) comprises an upper cone (521) and a lower cone (522); The diameter of the upper cone (521) increases from top to bottom, and the diameter of the lower cone (522) increases from bottom to top; the large-diameter end surfaces of the upper cone (521) and the lower cone (522) have the same diameter and are fixedly connected to each other; The guide cone sleeve (510) comprises an upper portion (511) and a lower portion (512); a second gas collecting port (513) is formed between the upper portion (511) and the lower portion (512) of the guide cone sleeve (510); The second gas collecting port (513) formed between the upper portion (511) and the lower portion (512) of the guide cone sleeve (510) is provided with a plurality of second mixing and collecting mechanisms (800) arranged in an array around the central circumference of the guide cone sleeve (510); The top ends of a plurality of the second mixing and collecting mechanisms (800) are slidably connected to the upper portion (511) of the guide cone sleeve (510), and the bottom ends of a plurality of the second mixing and collecting mechanisms (800) are flush with the connection point between the upper cone (521) and the lower cone (522); Wherein, a single second mixing and collecting mechanism (800) comprises a guide vane (810) and a pulley (820), and the pulley (820) is installed on the top of the guide vane (810); An extension plate (514) is provided on the inner side surface of the upper portion (511) of the guide cone sleeve (510), a circular arc groove is provided on the bottom surface of the extension plate (514), the guide vane (810) is mounted on the bottom surface of the extension plate (514), and the pulley (820) is slidably mounted in the circular arc groove.

2. The mixed flow exhaust fan according to claim 1, characterized in that: A connecting component (530) is provided at the connection between the upper cone (521) and the lower cone (522), and the upper cone (521) and the lower cone (522) are fixedly connected to the inner side surface of the guide cone sleeve (510) via the connecting component (530).

3. The mixed flow exhaust fan according to claim 2, characterized in that: The height of the upper cone (521) is greater than the height of the lower cone (522).

4. The mixed flow exhaust fan according to claim 1, characterized in that: A protective plate (210) is provided at the air inlet of the bypass air inlet box (200).

5. The mixed flow exhaust fan according to claim 1, characterized in that: The air volume regulating mechanism (400) comprises a louver regulating plate (410), a rotating shaft (420) and a controller (430), wherein the rotating shaft (420) is arranged on the louver regulating plate (410); The controller (430) drives the rotating shaft (420) to rotate, thereby driving the shutter adjustment plate (410) to open and close, so as to adjust the air intake volume.

6. The mixed flow exhaust fan according to claim 1, characterized in that: The gas delivery mechanism (300) comprises a cover plate (310), a gas delivery housing (320), a drive motor (330) and an impeller (340); The cover plate (310) is mounted on an end surface of the main air intake box (100) having an exhaust port, the cover plate (310) is provided with an air inlet (311), and the cover plate (310) is connected to the exhaust port of the main air intake box (100) through the air inlet (311); The gas delivery housing (320) is mounted on the cover plate (310) to surround the air inlet (311) of the cover plate (310), and the gas delivery housing (320) and the air inlet (311) of the cover plate (310) are located on the same axis; A support core barrel (350) is disposed inside the gas delivery housing (320); the support core barrel (350) and the gas delivery housing (320) are located at the same center of a circle; a gas delivery channel (360) is formed between the outer side surface of the support core barrel (350) and the inner side surface of the gas delivery housing (320); A circular arc guide vane (370) is provided between the outer side surface of the support core barrel (350) and the inner side surface of the gas delivery housing (320), and the support core barrel (350) is suspended inside the gas delivery housing (320) by means of the circular arc guide vane (370); The impeller (340) is mounted on the air inlet (311) of the cover plate (310), the drive motor (330) is mounted inside the support core barrel (350), and the output shaft of the drive motor (330) passes through the support core barrel (350) and is connected to the impeller (340) for driving the impeller (340) to rotate.

7. The mixed flow exhaust fan according to claim 6, characterized in that: The support plate (600) is fixed to an end of the gas delivery housing (320) away from the cover plate (310); The diameter of one end of the guide cone sleeve (510) close to the gas delivery housing (320) is greater than the diameter of one end of the gas delivery housing (320) away from the cover plate (310), thereby forming a first gas collecting port (700) between the guide cone sleeve (510) and the gas delivery housing (320) through the support plate (600).

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