Mixed-flow type exhaust fan

Abstract

The invention belongs to the technical field of fans, and particularly provides a mixed flow type exhaust fan which comprises a main air inlet box, a bypass air inlet box, an air conveying mechanism, an air flow adjusting mechanism and a first mixed flow collecting mechanism. A gas inlet of the main gas inlet box is communicated with a waste gas discharge port; the bypass air inlet box is arranged on one side of the main air inlet box, and an exhaust port of the bypass air inlet box is communicated with the main air inlet box; one end of the gas conveying mechanism is communicated with an exhaust port of the main gas inlet box; gas flow adjusting mechanisms are arranged at the joint of the bypass gas inlet box and the main gas inlet box and the joint of the gas conveying mechanism and the main gas inlet box; the first mixing and collecting mechanism comprises a flow guide taper sleeve and a flow guide cone, a supporting plate is arranged between the flow guide taper sleeve and the gas conveying mechanism, and a first gas collecting opening is formed between the flow guide taper sleeve and the gas conveying mechanism through the supporting plate. By mixing the external gas and the waste gas, the concentration of the discharged waste gas is reduced, so that the construction and maintenance cost is reduced, and the environment-friendly requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to a mixed flow exhaust fan. Background Art

[0002] In the laboratory, a variety of harmful waste gases are generated during experimental operations, and these waste gases are usually discharged to the outside through chimneys / exhaust ports. According to environmental protection regulations and other regulations, the emission of harmful waste gases requires the chimneys / exhaust ports 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 potential risks to the surrounding people and the environment. However, setting the chimneys / exhaust ports to a certain height will increase the cost of construction and maintenance, and may require more technical support and manpower investment. Therefore, while meeting environmental protection requirements, it is also necessary to balance economic and technical feasibility.

[0003] Based on this, the present invention proposes a mixed 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 a mixed flow exhaust fan to solve the problems in the prior art.

[0005] One embodiment of the present invention provides a mixed flow exhaust fan, comprising:

[0006] A main air intake box, the main air intake box having an air intake port and an exhaust port, the air intake port of the main air intake box being connected to the exhaust gas exhaust port;

[0007] A bypass air intake box, the bypass air intake box having an air intake port and an exhaust port, the bypass air intake box is arranged on one side of the main air intake box, and the exhaust port of the bypass air intake box is connected to the main air intake box;

[0008] A gas delivery mechanism, one end of which is connected to the exhaust port of the main air inlet box;

[0009] An air volume regulating mechanism, wherein 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 an air volume regulating mechanism;

[0010] A first mixing and collecting mechanism, which is arranged at one end of the gas delivery mechanism away from the main air inlet box, and the first mixing and collecting mechanism and the gas delivery mechanism are located at the same axis;

[0011] Wherein, the first mixing and collecting mechanism comprises a guide cone sleeve and a guide cone, the guide cone is arranged inside the guide cone sleeve, and the two are located at 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 by 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 guide vane is provided between the outer side surface of the support core barrel and the inner side surface of the gas delivery shell, and the support core barrel is suspended and arranged inside the gas delivery shell by the arc guide vane;

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

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

[0028] The diameter of one end of the guide cone sleeve close to the gas delivery housing is greater than the diameter of one end of the gas delivery housing away from the cover plate, thereby forming a first gas collecting port between the guide cone sleeve and the gas delivery housing through the support plate.

[0029] In one embodiment, the guide cone sleeve comprises an upper portion and a lower portion, and a second gas manifold is formed between the upper portion and the lower portion of the guide cone sleeve;

[0030] The second gas collecting port formed between the upper part and the lower part of the guide cone sleeve is provided with a plurality of second mixing and collecting mechanisms arranged in an array around the central circumference of the guide cone sleeve;

[0031] The top ends of a plurality of the second mixing and collecting mechanisms are slidably connected to the upper part of the guide cone sleeve, and the bottom ends 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 on the top of the guide vane;

[0033] An extension plate is provided on the inner side surface of the upper part of the guide cone sleeve, an arc 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 groove.

[0034] The mixed flow exhaust fan provided in 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 A schematic diagram of the structure of a gas delivery mechanism of a mixed flow exhaust fan provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the internal structure of a gas delivery mechanism of a mixed flow exhaust fan provided in an embodiment of the present invention;

[0044] Figure 5 A schematic structural diagram of a first mixing and collecting mechanism of a mixed flow exhaust fan provided in an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the gas flow direction of a mixed flow exhaust fan provided in an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of a second mixing and collecting mechanism of a mixed flow exhaust fan provided by an embodiment of the present invention;

[0047] Figure 8 A schematic diagram of the position of a second mixing and collecting mechanism of a mixed flow exhaust fan provided in an embodiment of the present invention.

[0048] Figure Number:

[0049] 100, main air inlet box; 200, bypass air inlet box; 210, protective plate; 300, gas delivery mechanism; 310, cover plate; 311, air inlet; 320, gas delivery housing; 330, drive motor; 340, impeller; 350, support core; 360, gas delivery channel; 370, arc guide vane; 400, gas volume adjustment mechanism; 410, shutter 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; 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 DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0052] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] Reference Figure 1-Figure 6 One embodiment of the present invention provides a mixed flow exhaust fan, comprising:

[0054] A main air intake box 100, wherein the main air intake box 100 has an air intake port and an exhaust port, and the air intake port of the main air intake box 100 is connected to the exhaust gas exhaust port;

[0055] A bypass air intake box 200, wherein the bypass air intake box 200 has an air intake port and an exhaust port, and the bypass air intake box 200 is disposed on one side of the main air intake box 100, and the exhaust port of the bypass air intake box 200 is connected to the main air intake box 100;

[0056] A gas delivery mechanism 300, one end of which is connected to the exhaust port of the main air intake box 100;

[0057] An air volume regulating mechanism 400, 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;

[0058] A first mixing and collecting mechanism 500, wherein the first mixing and collecting mechanism 500 is disposed 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 are located at 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 2One end of the main air intake box 100 is an air inlet, and the other end is an exhaust port. The air inlet of the main air intake box 100 is connected to the chimney / exhaust port of the laboratory, and the exhaust gas generated by the experimental operation directly enters the main air intake box 100 through the chimney / exhaust port. One end of the bypass air intake box 200 is an air inlet, and the other end is an exhaust port. The bypass air intake box 200 is arranged on the side of the main air intake box 100, and the exhaust port of the bypass air intake box 200 is connected to the side of the main air intake box 100. An air volume regulating mechanism 400 is provided at the connection between the bypass air intake box 200 and the main air intake box 100. The air volume regulating mechanism 400 is used to adjust the opening and closing degree between the two to achieve the purpose of controlling the air intake volume. The air inlet of the bypass air intake box 200 is connected to a fan (not shown in the figure), etc., and external gas is input through the fan and enters the main air intake box 100 from the exhaust port of the bypass air intake box 200 to mix with the exhaust gas to reduce / dilute the concentration of the exhaust gas. One end of the gas delivery mechanism 300 is connected to the exhaust port of the main air intake box 100, and a gas volume regulating mechanism 400 is also provided at the connection between the two. The gas volume regulating mechanism 400 is used to adjust the opening and closing degree between the two to achieve the purpose of controlling the intake volume (the mixed gas entering the gas delivery mechanism 300). When the mixed gas enters the gas delivery mechanism 300, the gas delivery 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 520. The guide cone sleeve 510 is installed at the end of the gas delivery mechanism 300 away from the main air intake box 100, and the guide cone sleeve 510 and the gas delivery mechanism 300 are located at the same axis, and the diameter of the end of the guide cone sleeve 510 close to the gas delivery mechanism 300 is larger than the diameter of the gas delivery mechanism 300, so that the gas delivery mechanism 300 can completely input the mixed gas into the guide cone sleeve 510. A plurality of support plates 600 distributed at equal intervals are arranged between the guide cone sleeve 510 and the gas delivery mechanism 300, and 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 through the support plates 600.The guide cone 520 is arranged inside the guide cone sleeve 510 and is on the same axis as the guide cone sleeve 510 and the gas delivery mechanism 300. Through this design, the mixed gas input into the guide cone sleeve 510 will first be rebounded by the guide cone 520 and dispersed around, and the mixed gas will flow evenly along the conical surface of the guide cone 520 to the other end (discharge) of the guide cone sleeve 510; because the mixed gas input into the guide cone sleeve 510 has a certain flow rate, under the action of the guide cone 520, a large suction force will be generated at the first gas collecting port 700 formed between the guide cone sleeve 510 and the gas delivery mechanism 300, 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, such as. Figure 6 As shown, the mixed gas is mixed with the external gas again to further reduce the concentration of the exhaust gas. After the double dilution effect, the concentration of the harmful exhaust gas is reduced multiple times and then discharged from the other end of the guide cone sleeve 510.

[0064] In this embodiment, the discharged exhaust gas is input through the main air intake box 100 connected to the exhaust gas discharge port, and the external gas is input through the bypass air intake box 200 to mix with the exhaust gas in the main air intake box 100 to reduce the concentration of the exhaust gas, and the mixed gas is accelerated and rotated by the gas conveying mechanism 300, so that the mixed gas flows into the guide cone sleeve 510 of the first mixing and collecting mechanism 500 with a certain flow rate, and due to the action of the guide cone 520, the external gas is driven to be sucked into the guide cone sleeve 510 from the first gas collecting port 700, so that the mixed gas is mixed with the external gas again, further reducing the concentration of the exhaust gas, and through the double dilution effect, 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, so that the height of the chimney / exhaust port can be reduced, so that while meeting environmental protection requirements, the construction and maintenance costs are also reduced accordingly.

[0065] In one embodiment, the guide 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, 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.

[0067] 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 through the connecting component 530 .

[0068] In this embodiment, refer 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 Figure 2-Figure 4The gas delivery mechanism 300 is composed of a cover plate 310, a gas delivery shell 320, a drive motor 330 and an impeller 340; a circular air inlet 311 is arranged in the middle of the cover plate 310, the cover plate 310 is mounted on the end surface 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 shell 320 is cylindrical in design and is sleeved on the cover plate 310, a cylindrical support core tube 350 is arranged inside the gas delivery shell 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 shell 320, the gas delivery shell 320 and the support core tube 350 are both arranged coaxially 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 driving motor 330 is installed inside the supporting core barrel 350, and its output shaft passes through the supporting core barrel 350 to be connected with the impeller 340. The impeller 340 is a backward curved blade type. The impeller 340 is installed on the air inlet 311. The driving motor 330 drives 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 plurality of twisted arc guide vanes 370 are arranged in the middle position of the gas delivery channel 360. The plurality of arc guide vanes 370 are arranged in a circular array with the axis of the support core tube 350 as the center, and the support core tube 350 is suspended inside the gas delivery shell 320 by the arranged arc guide vanes 370; the twisted arc guide vanes 370 are designed to serve as a supporting component to support the support core tube 350, and also to make the mixed gas flow along the twisted direction of the arc guide vanes 370 when being transported to the guide cone sleeve 510, thereby increasing the rotation speed of the gas, increasing the flow rate of the mixed gas, and thereby increasing the suction at the first gas collecting port 700, thereby increasing the amount of external gas entering the guide cone sleeve 510 from the first gas collecting port 700.

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

[0085] The diameter of the end of the guide cone sleeve 510 close to the gas delivery housing 320 is greater than the diameter of the 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.

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

[0087] In one embodiment, the guide cone sleeve 510 includes an upper portion 511 and a lower portion 512 , and a second gas manifold 513 is formed between the upper portion 511 and the lower portion 512 of the guide cone sleeve 510 ;

[0088] 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;

[0089] The top ends of several 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 several of the second mixing and collecting mechanisms 800 are flush with the connection point between the upper cone 521 and the lower cone 522 .

[0090] The single second mixing and collecting mechanism 800 includes a guide vane 810 and a pulley 820, and the pulley 820 is installed on the top of the guide vane 810;

[0091] An extension plate 514 is provided on the inner side of the upper portion 511 of the guide cone sleeve 510 , and an arc groove 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 , and the pulley 820 is slidably installed in the arc groove.

[0092] In this embodiment, if Figure 7 , Figure 8 As shown, further, the guide cone sleeve 510 includes an upper portion 511 and a lower portion 512, a second gas manifold 513 is formed between the upper portion 511 and the lower portion 512 of the guide cone sleeve 510, and a plurality of second mixing and collecting mechanisms 800 are arranged in a circular array at the second gas manifold 513 with the center of the guide cone sleeve 510. In this embodiment, there are at least four second mixing and collecting mechanisms 800, and the four second mixing and collecting mechanisms 800 are connected end to end, as shown in FIG. Figure 8The figure shows the position diagram of the second mixing and collecting mechanism 800. The structure of each second mixing and collecting mechanism 800 is the same, and is composed of a guide vane 810 and a pulley 820. The pulley 820 is arranged on both sides of the top of the guide vane 810. The inner side surface of the upper part 511 of the guide cone sleeve 510 is provided with an extension plate 514, and the bottom surface of the extension plate 514 is provided with an arc groove. 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 groove. 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 velocity 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 After 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 groove of the extension plate 514 to 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, the second gas collecting port 513 generates a certain suction force, which drives the external gas from the second gas collecting port 513 to be sucked into the guide cone sleeve 510 and mixed with the mixed gas again to reduce the concentration of the exhaust gas. In this embodiment, the mixed gas is further mixed with the external gas by the second mixing and collecting mechanism 800 to reduce the concentration of the exhaust gas, and the driving of the second mixing and collecting mechanism 800 does not require additional power, which can increase the exhaust gas dilution effect while achieving energy-saving effect; and the second mixing and collecting mechanism 800 in this embodiment has a simple structure, so the cost is also reduced, and a good dilution effect can be achieved at low cost.

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

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept 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 connected to 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), wherein the first mixing and collecting mechanism (500) is arranged at one end of the gas conveying mechanism (300) away from the main air inlet box (100), and the first mixing and collecting mechanism (500) and the gas conveying mechanism (300) are located on 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 arranged 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 manifold (700) is formed between the guide cone sleeve (510) and the gas delivery mechanism (300) through 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).

2. The mixed flow exhaust fan according to claim 1, characterized in that: 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. 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 shutter regulating plate (410), a rotating shaft (420) and a controller (430); 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); The controller (430) drives the rotating shaft (420) to rotate and drive the opening and closing degree of the shutter adjustment plate (410) to adjust the intake volume of the main air intake box (100) and the bypass air intake box (200).

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 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 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, and 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 and arranged inside the gas delivery housing (320) by means of the circular arc guide vane (370); 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.

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).

8. The mixed flow exhaust fan according to claim 2, characterized in that: The guide cone sleeve (510) comprises an upper portion (511) and a lower portion (512), and a second gas collecting port (513) is formed between the upper portion (511) and the lower portion (512) of the guide cone sleeve (510); A 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).

9. The mixed flow exhaust fan according to claim 8, characterized in that: A single second mixing and collecting mechanism (800) comprises a guide vane (810) and a pulley (820), wherein 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.

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