Flow dividing mechanism and air handling unit

Abstract

The invention provides a flow dividing mechanism and an air handling unit. The flow dividing mechanism comprises a volute, and air inlets are formed in the two sides of the volute correspondingly; the heat exchanger is arranged on the upstream side of the volute in the airflow direction; the first flow guide part is arranged at the first end of the heat exchanger; the second flow guide part is arranged at the second end of the volute, and the first end and the second end are opposite at intervals; the first flow guide part and the second flow guide part are configured to guide airflow flowing through the first end of the heat exchanger to the air inlets in the two sides of the volute, so that part of air passing through the heat exchanger can flow into the air inlets in the two sides of the volute under the guide effect of the first flow guide part, and a vortex area between the heat exchanger and the volute can be reduced through the first flow guide part; and the rest gas can be further guided into the air inlets in the two sides of the volute along the second flow guide part, so that the turning angle of the gas flowing through the heat exchanger in the process of flowing to the air inlets of the volute is reduced, and the pneumatic loss is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air handling units, and in particular to a flow diversion mechanism and an air handling unit. Background Art

[0002] Existing duct air conditioners (duct units for short) mostly use centrifugal fans in their indoor units. When the centrifugal fan is working, the high-speed rotation of the impeller causes the gas to flow through the evaporator and then be sucked into the impeller axially through the volute air inlet, then flow through the blade channel and out of the impeller, and finally the volute or other flow channel structures collect and guide the gas and then discharge it from the air outlet. However, after the gas passes through the evaporator, part of the gas will gather at the lower end of the volute, and only after two 90° bends can this part of the gas flow to the volute air inlet, which leads to increased gas flow loss and increased power.

[0003] In the related art, the flow loss is improved by adjusting the evaporator placement angle or beveling the side of the volute close to the evaporator. However, changing the evaporator placement angle is likely to reduce the performance of the evaporator itself; beveling the side of the volute requires increasing the gap between the volute and the wind wheel to ensure sufficient beveling space, and this method will increase the volume of the duct machine and increase the production cost of the duct machine. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a diversion mechanism and an air handling unit, which aims to solve the problem that part of the gas in the existing duct unit will be collected at the lower end of the volute after passing through the evaporator, and this part of the gas needs to be turned 90° twice before flowing to the volute air inlet, thereby increasing gas flow losses and increasing power.

[0005] To achieve the above objectives, the present disclosure provides a diversion mechanism in a first aspect, comprising:

[0006] A volute, wherein air inlets are respectively arranged on both sides of the volute;

[0007] a heat exchanger, arranged on the upstream side of the volute along the airflow direction;

[0008] A first flow guide portion, disposed at a first end of the heat exchanger;

[0009] A second flow guide portion is disposed at a second end of the volute, the first end and the second end being spaced apart and facing each other;

[0010] The first guide portion and the second guide portion are configured to guide the airflow flowing through the first end of the heat exchanger to the air inlets on both sides of the volute.

[0011] The diversion mechanism provided by the present disclosure has air inlets on both sides of the volute, the heat exchanger is arranged on the upstream side of the volute, the first guide portion is arranged at the first end of the heat exchanger, the second guide portion is arranged at the second end of the volute, and the first end and the second end are spaced opposite to each other, and the first guide portion and the second guide portion are configured to guide the airflow flowing through the first end of the heat exchanger to the air inlets on both sides of the volute, so that part of the gas after heat exchange in the heat exchanger can flow along the first guide portion to the air inlets on both sides of the volute under the guidance of the first guide portion, and pass through The first guide part can reduce the vortex area between the heat exchanger and the volute, and the remaining part of the gas can be further guided to the air inlets on both sides of the volute along the second guide part under the guidance of the second guide part, so that the turning angle of the gas flowing through the heat exchanger to the air inlets on both sides of the volute is reduced, thereby reducing the loss of gas flow; and the first guide part and the second guide part can straighten the airflow field between the heat exchanger and the volute, reduce the probability of airflow turbulence, thereby reducing the noise of gas flow and increasing the flow rate of gas. The above-mentioned diversion mechanism does not need to change the placement angle of the existing evaporator, so that the performance of the evaporator itself will not be reduced; nor will the gap between the side of the volute and the wind wheel be increased, so that the space occupied by the diversion mechanism will not be increased.

[0012] In some embodiments, the first flow guiding portion includes at least one flow guiding surface extending in a direction away from the center of the first end of the heat exchanger and along a downstream side of the heat exchanger.

[0013] In some embodiments, the heat exchanger comprises:

[0014] Two inverted V-shaped sub-heat exchangers, the two inverted V-shaped sub-heat exchangers are sequentially arranged along the communication direction of the two air inlets, and the two inverted V-shaped sub-heat exchangers together form an M-shaped heat exchanger; and

[0015] The two guide surfaces are symmetrical along the center of the heat exchanger, and the two guide surfaces are respectively arranged at the first ends of the two inverted V-shaped sub-heat exchangers.

[0016] In some embodiments, each of the guide surfaces includes a first guide section and a second guide section that are connected to each other, one end of the first guide section is located at one end of the inverted V-shaped sub-heat exchanger away from the air inlet, and the other end extends toward the other end of the inverted V-shaped sub-heat exchanger and close to the air inlet, one end of the second guide section is located at one end of the inverted V-shaped sub-heat exchanger close to the air inlet, and the other end extends toward the air inlet on the corresponding side, and an edge of one side of the first guide section adjacent to the air inlet is connected to an edge of one side of the second guide section adjacent to the air inlet.

[0017] In some embodiments, the heat exchanger is located below the volute, and the cross-section of the first guide section along the connecting direction of the two air inlets is in a first curve shape. In the direction from the middle area of ​​the second end of the volute to the air inlet on one side of the volute, the first curve shape includes a first curve segment AB, a second curve segment BC, a third curve segment CD, and a fourth curve segment DE connected in sequence. With point A as the starting point, the first curve segment AB is tangent to a vertical line of a preset distance extending outward from point A in a direction close to another guide surface to form a convex curve, the second curve segment BC extends outward from point B in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a convex curve, the third curve segment CD extends outward from point C in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve, and the fourth curve segment DE extends outward from point D in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve;

[0018] The cross-section of the second guide section along the connecting direction of the two air inlets is in a second curved shape. In the direction from the air inlet on one side of the volute to the middle area of ​​the second end of the volute, the second curved shape includes a fifth curved segment EF and a sixth curved segment FG connected in sequence. The fifth curved segment EF is connected to the fourth curved segment DE and an angle less than 90 degrees is formed therebetween. The fifth curved segment EF takes point E as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve. The sixth curved segment FG takes point F as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve.

[0019] In some embodiments, the width h1 of the guide surface along the connecting direction of the two air inlets is 80-100 mm, the height m of the guide surface along the direction away from the first end of the inverted V-shaped sub-heat exchanger and close to the second end of the volute is 0.1-0.5h1, an opening is formed between one end of the first guide section located on one side of the end of the inverted V-shaped sub-heat exchanger and one end of the second guide section located on the other side of the end of the inverted V-shaped sub-heat exchanger, the dimension h2 of the opening along the connecting direction of the two air inlets is 0.5-1h1, and the thickness d of the guide surface is 0.3-1.2 mm.

[0020] In some embodiments, the second guide portion includes a first curved surface segment and a second curved surface segment connected to each other, the first curved surface segment and the second curved surface segment are arranged opposite to each other along the connection direction of the two air inlets, and the edges of the first curved surface segment and the second curved surface segment close to each other are connected to each other in the middle area of ​​the second end of the volute, and the first curved surface segment and the second curved surface segment are both extended in a direction away from each other and along the downstream side of the volute.

[0021] In some embodiments, the edges of the first curved surface segment and the second curved surface segment away from each other are consistent with the outer peripheral contour line of the volute, and the edges of the first curved surface segment and the second curved surface segment close to each other gradually protrude and extend toward the first end of the heat exchanger to form a guide ridge at the connection position of the first curved surface segment and the second curved surface segment.

[0022] In some embodiments, the first curved surface segment and the second curved surface segment are symmetrically arranged along the connecting direction of the two air inlets, and the cross section of the first curved surface segment along the connecting direction of the two air inlets is formed into a third curved shape. In the direction from the middle area of ​​the second end of the volute to the air inlet on one side of the volute, the third curved shape includes a seventh curved segment IJ and an eighth curved segment JK connected in sequence. With point I as the starting point, the seventh curved segment IJ is a concave curve that shrinks and extends inwardly in the direction close to the second end of the volute, and with point J as the starting point, the eighth curved segment JK is a convex curve that shrinks and extends inwardly in the direction close to the second end of the volute;

[0023] The second guide portion is extended along the outer contour line of the second end of the volute, and the extension direction of the second guide portion is the length direction of the second guide portion. The side edge of the first curved surface segment close to the second curved surface segment is formed as an arc segment MN along the length direction of the second curved surface segment, and the seventh curved segment IJ and the eighth curved segment KJ are swept along the arc segment MN to form the first curved surface segment.

[0024] In some embodiments, the second air guide portion also includes a third curved surface segment and a fourth curved surface segment, and the third curved surface segment and the fourth curved surface segment are arranged opposite to each other in a direction perpendicular to the connection direction of the two air inlets, the third curved surface segment is connected to the first curved surface segment and the second curved surface segment on one side edge along the direction perpendicular to the connection direction of the two air inlets, and the fourth curved surface segment is connected to the first curved surface segment and the second curved surface segment on the other side edge along the direction perpendicular to the connection direction of the two air inlets.

[0025] In some embodiments, the heat exchanger is located below the volute, the third curved surface segment is formed into a fourth curved shape along a cross section perpendicular to the connecting direction of the two air inlets, the fourth curved shape includes a ninth curved segment QN, and the third curved surface segment is formed by the ninth curved segment QN sweeping from the central area of ​​the second end of the volute to the air inlets on both sides of the volute;

[0026] The fourth curved surface segment forms a fifth curve type along a cross section perpendicular to the connecting direction of the two air inlets, and the fifth curve type includes a tenth curved surface segment PM. The fourth curved surface segment is formed by the tenth curved surface segment PM sweeping from the central area of ​​the second end of the volute to the air inlets on both sides of the volute.

[0027] In some embodiments, the width p of the second air guide portion along the connecting direction of the two air inlets is 200-350 mm, the length l of the second air guide portion is 350-500 mm, the height q of the first curved surface segment and the second curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 25-80 mm, the height a of the third curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 100-140 mm, and the height b of the fourth curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 120-160 mm.

[0028] A second aspect of the present disclosure provides an air handling unit, comprising a diversion mechanism as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is a structural schematic diagram of a diversion mechanism according to an embodiment of the present disclosure;

[0032] Figure 2 A side view of a diversion mechanism according to an embodiment of the present disclosure;

[0033] Figure 3 for Figure 2 Sectional view along AA direction;

[0034] Figure 4 This is a cross-sectional view of a first air guide portion and a second air guide portion along the X direction according to an embodiment of the present disclosure;

[0035] Figure 5 This is a schematic structural diagram of a first air guide portion and a second air guide portion according to an embodiment of the present disclosure;

[0036] Figure 6 This is a cross-sectional view of a first air guide portion and a second air guide portion along the Y direction in an embodiment of the present disclosure;

[0037] Figure 7 This is a schematic diagram of the profile of the first guide portion and the second guide portion along the X direction according to an embodiment of the present disclosure.

[0038] Reference numerals:

[0039] 1. volute; 10. air inlet; 2. heat exchanger; 3. first air guide; 30. air guide surface; 31. first air guide section; 32. second air guide section; 4. second air guide; 40. air guide ridge; 41. first curved surface section; 42. second curved surface section; 43. third curved surface section; 44. fourth curved surface section. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0042] like Figures 1 to 7 As shown, some embodiments of the present disclosure provide a flow diversion mechanism, including a volute 1, a heat exchanger 2, a first flow guide portion 3 and a second flow guide portion 4.

[0043] Among them, air inlets 10 are respectively provided on both sides of the volute 1, and a wind wheel is provided inside the volute 1, which is used to drive the gas into the diversion mechanism, and the gas is discharged after heat exchange with the heat exchanger 2. Specifically, air inlets 10 are respectively provided on both sides of the volute 1 along the axial direction, and the axial direction of the volute 1 is arranged parallel to the axial direction of the wind wheel located therein. The heat exchanger 2 is arranged on the upstream side of the volute 1 along the airflow direction, and is used to exchange heat with the gas. The first guide portion 3 is arranged at the first end of the heat exchanger 2, and the second guide portion 4 is arranged at the second end of the volute 1, and the first end and the second end are spaced apart from each other. The first guide portion 3 and the second guide portion 4 are configured to guide the airflow flowing through the first end of the heat exchanger 2 to the air inlets 10 on both sides of the volute 1.

[0044] The diversion mechanism provided by the present disclosure has air inlets 10 respectively arranged on both sides of the volute 1, the heat exchanger 2 is arranged on the upstream side of the volute 1 along the airflow direction, the first guide portion 3 is arranged at the first end of the heat exchanger 2, the second guide portion 4 is arranged at the second end of the volute 1, and the first guide portion 3 and the second guide portion 4 are configured to guide the airflow flowing through the first end of the heat exchanger 2 to the air inlets 10 on both sides of the volute 1, so that part of the gas after heat exchange by the heat exchanger 2 can flow to the air inlets 10 on both sides of the volute 1 along the first guide portion 3 under the guiding action of the first guide portion 3 toward the air inlets 10 on both sides, the vortex area between the heat exchanger 2 and the volute 1 can be reduced by the first guide portion 3, and the remaining part of the gas can be guided by the second guide portion 4 toward the air inlets 10 on both sides with a gradually increasing trend. Under the action of the second guide part 4, the gas is further guided to the air inlets 10 on both sides of the volute 1, so that the turning angle of the gas flowing through the heat exchanger 2 in the process of flowing to the air inlets 10 on both sides of the volute 1 is reduced, thereby reducing the gas flow loss; and there is no need to change the placement position and angle of the volute 1 and the heat exchanger 2, nor to increase the size of the volute 1. Only through the first guide part 3 and the second guide part 4, the airflow field between the heat exchanger 2 and the bottom of the volute 1 can be straightened out, and the probability of airflow turbulence is reduced, thereby reducing the noise of gas flow and increasing the flow rate of gas. While reducing the power of the diversion mechanism, it does not affect the performance of the volute 1 and the heat exchanger 2 itself, nor does it increase the gap between the side of the volute 1 and the wind wheel, thereby not increasing the space occupied by the diversion mechanism.

[0045] It should be noted that, in actual application, the installation positions of the volute 1 and the heat exchanger 2 can be flexibly set according to different installation requirements. For example, the diversion mechanism provided by the present disclosure is used in an air handling unit. When the air handling unit is installed horizontally in the horizontal direction, the volute 1 and the heat exchanger 2 can be installed relatively in the air handling unit in the horizontal direction, that is, the air flows in the horizontal direction; or, when the air handling unit is installed vertically in the height direction, the heat exchanger 2 is located below the volute 1, that is, the air flows in the vertical direction, as long as it can be ensured that the heat exchanger 2 is arranged on the upstream side of the volute 1 along the airflow direction.

[0046] In some embodiments, reference Figures 1 to 3 As shown, the heat exchanger 2 is located below the volute 1, and the first guide portion 3 and the second guide portion 4 both extend from the middle area of ​​the bottom of the volute 1 toward the air inlets 10 on both sides of the volute 1 in a gradually rising trend. That is to say, the first guide portion 3 and the second guide portion 4 both extend from the middle area of ​​the bottom of the volute 1 toward the air inlets 10 on both sides of the volute 1 in a gradually upwardly inclined trend, so that the airflow flowing through the top of the heat exchanger 2 is guided to the air inlets 10 on both sides of the volute 1 through the first guide portion 3 and the second guide portion 4.

[0047] It should be noted that in the description of this disclosure, reference is made to Figure 1 As shown, with the flow splitting mechanism standing still on the ground in a vertical direction, the X direction is the left-right direction of the volute 1, that is, the flow direction between the two air inlets 10, the Y direction is the front-back direction of the volute 1, that is, the length direction of the volute 1, and the Z direction is the height direction of the volute 1, that is, the installation direction between the volute 1 and the heat exchanger 2. The middle area at the bottom of the volute 1 is divided based on the X direction, and the middle part close to the volute 1 along the X direction is the middle area at the bottom of the volute 1. The directional words disclosed in this disclosure are only for the convenience of description and are not used to limit the specific direction of the flow splitting mechanism disclosed in this disclosure.

[0048] In some embodiments, reference Figure 5 As shown, the first guide portion 3 includes two guide surfaces 30, and the two guide surfaces 30 are symmetrically arranged along the connecting direction of the two air inlets 10, that is, the two guide surfaces 30 are symmetrically arranged along the X direction, one of the guide surfaces 30 gradually increases from the middle area of ​​the bottom of the volute 1 toward the direction of the air inlet 10 on one side of the volute 1, and the other guide surface 30 gradually increases from the middle area of ​​the bottom of the volute 1 toward the direction of the air inlet 10 on the other side of the volute 1, thereby quickly guiding the gas flowing through the heat exchanger 2 to the air inlets 10 on both sides of the volute 1. It should be noted that no matter in which direction the air handling unit is installed during actual application, in the direction of the airflow flowing into the air inlets 10 on both sides of the volute 1 through the heat exchanger 2, the air inlets 10 on both sides of the volute 1 are the downstream side, and the airflow flowing out of the heat exchanger 2 to the air inlets 10 is the upstream side. The two guide surfaces 30 are both located on the upstream side of the airflow direction, and each guide surface 30 is respectively arranged corresponding to the air inlet 10 on the corresponding side to guide the airflow to the air inlets 10 on both sides accordingly.

[0049] Reference Figure 1 and Figure 3As shown, specifically, the heat exchanger 2 includes two inverted V-shaped sub-heat exchangers, which are arranged in sequence along the communication direction of the two air inlets 10, that is, the two inverted V-shaped sub-heat exchangers are arranged in sequence along the X direction, and the two inverted V-shaped sub-heat exchangers together constitute an M-type heat exchanger. The M-type heat exchanger is an evaporator, and the evaporator is arranged as two connected sub-evaporators, so that the structure of the evaporator is more compact, the internal space of the diversion mechanism can be reduced, and the overall volume of the air handling unit using the diversion mechanism can be reduced. The inner walls of the upper ends of the two inverted V-shaped sub-heat exchangers are respectively formed in a "V" shape, which can divert the gas that needs heat exchange, which is beneficial to reducing the local vortex area inside the heat exchanger 2, so that the air outlet of the heat exchanger 2 is smoother. The two guide surfaces 30 are respectively arranged on the top of the two inverted V-shaped sub-heat exchangers in a one-to-one manner, so that the two parts of the gas after heat exchange can be directly gathered on the two guide surfaces 30 on both sides, so as to respectively guide the gas on the top of the two inverted V-shaped sub-heat exchangers to the air inlets 10 on both sides of the volute 1, so that the entire heat exchange and air intake process is more regular, smoother and gentler, and the vortex area caused by the accumulation or congestion of the gas in the whole process is reduced, thereby reducing the flow loss of the gas.

[0050] It should be noted that the above-mentioned setting of the first guide part 3 is only an exemplary setting method. In actual application, the heat exchanger 2 and the first guide part 3 can also be set as one. The heat exchanger 2 is an inverted U-shaped heat exchanger, and the first guide part 3 is a guide plate structure placed on the top of the heat exchanger 2. The middle part of the guide plate structure gradually increases along the X direction toward the direction of the air inlet 10 on both sides of the volute 1, which can also achieve the guiding effect on the gas on the top of the heat exchanger 2.

[0051] Further, refer to Figure 2 and Figure 3As shown, the guide surface 30 includes a first guide section 31 and a second guide section 32 connected to each other, one end of the first guide section 31 is located at the end of the inverted V-shaped sub-heat exchanger away from the end of the air inlet 10, and the other end extends toward the other side of the inverted V-shaped sub-heat exchanger and close to the air inlet 10, that is, the first guide section 31 is extended as a whole with a gradually high trend, one end of the second guide section 32 is located at the end of the inverted V-shaped sub-heat exchanger close to the end of the air inlet 10, and the other end extends toward the direction of the air inlet 10 on the corresponding side, that is, the second guide section 32 is extended as a whole with a gradually high trend, and the first guide section 31 is close to the air inlet One side edge of the air port 10 is connected to the one side edge of the second guide section 32 adjacent to the air inlet 10, so that the first guide section 31 and the second guide section 32 can form a complete guide plate structure, and the connection position of the two guide plates faces the air inlet 10, so that part of the gas after heat exchange in the heat exchanger 2 can flow toward the air inlet 10 along the first guide section 31, and the rest of the gas can flow toward the air inlet 10 along the second guide section 32. The two parts of gas can merge and flow into the air inlet 10, thereby quickly guiding the gas flowing through one of the inverted V-shaped sub-heat exchangers to the air inlet 10 on one side of the volute 1.

[0052] In some embodiments, reference Figure 7 As shown, specifically, the width h1 of the guide surface 30 along the connecting direction of the two air inlets 10 is 80-100 mm, the height m of the guide surface 30 along the direction away from the first end of the inverted V-shaped sub-heat exchanger and close to the second end of the volute 1 is 0.1-0.5h1, an opening is formed between one end of the first guide section 31 located on one side of the end of the inverted V-shaped sub-heat exchanger and one end of the second guide section 32 located on the other side of the end of the inverted V-shaped sub-heat exchanger, that is, an opening is formed between the bottom of the first guide section 31 and the bottom of the second guide section 32, the dimension h2 of the opening along the connecting direction of the two air inlets 10 is 0.5-1h1, and the thickness d of the guide surface is 0.3-1.2 mm.

[0053] In some embodiments, the cross-section of the first guide section 31 along the connecting direction of the two air inlets 10 is in a first curved shape. In the direction from the middle area of ​​the second end of the volute 1 to the air inlet 10 on one side of the volute, the first curved shape includes a first curved segment AB, a second curved segment BC, a third curved segment CD, and a fourth curved segment DE connected in sequence. Starting from point A, the first curved segment AB is tangent to a vertical line of a preset distance from point A in a direction close to the other guide surface 30 to form a convex curve. The second curved segment BC starts from point B and extends outward in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a convex curve. The third curved segment CD starts from point C and extends outward in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve. The fourth curved segment DE starts from point D and extends outward in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve.

[0054] The cross-section of the second guide section 32 along the connecting direction of the two air inlets 10 is a second curved line. In the direction from the air inlet 10 on one side of the volute 1 to the middle area of ​​the second end of the volute 1, the second curved line includes a fifth curved segment EF and a sixth curved segment FG connected in sequence. The fifth curved segment EF is connected to the fourth curved segment DE and an angle less than 90 degrees is formed therebetween. The fifth curved segment EF takes point E as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve. The sixth curved segment FG takes point F as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve.

[0055] It should be noted that the above-mentioned limitation on the extension direction of the first guide section 31 and the second guide section 32 is based on how the first guide section 31 and the second guide section 32 extend relative to the inverted V-shaped sub-heat exchanger. Since the first guide section 31 extends upward in the direction of the volute 1 as a whole relative to the inverted V-shaped sub-heat exchanger, the first guide section 31 is extended outward, and since the second guide section 32 extends downward in the direction away from the volute 1 as a whole relative to the inverted V-shaped sub-heat exchanger, the second guide section 32 is extended inward. In addition, each curve of the first guide section 31 and the second guide section 32 has a straight line connecting the two ends, and each curve is a convex curve if it is above the straight line and a concave curve if it is below the straight line relative to the straight line connecting the two ends.

[0056] In a specific embodiment, when the air handling unit is installed vertically in the height direction, the heat exchanger 2 is located below the volute 1, that is, when the air flows in the vertical direction, with point A as the starting point, the first curve segment AB is tangent to the vertical line of the point A expanding outward along the X direction by a preset distance to form an upward convex curve. For example, the first curve segment AB can be tangent to the vertical line of the point A expanding outward along the X direction by 0.1h1-0.25h1. The vertical height n of the first curve segment AB along the Z direction is 0.1-0.3h1. The second curve segment BC expands upward along the Z direction with point B as the starting point to form an upward convex curve. For example, the second curve segment BC can be an upward convex curve with point B as the starting point to expand upward along the Z direction by 0.1-0.3n. The third curve segment CD expands upward along the Z direction with point C as the starting point to form a downward convex curve. For example, the third curve segment CD can be a downward convex curve with point C as the starting point to expand upward along the Z direction by 0.2-0.4n. The fourth curve segment DE starts from point D and expands upward along the Z direction to form a downward convex curve. For example, the fourth curve segment DE can be a downward convex curve starting from point D and expanding upward along the Z direction by 0.05-0.25n, and the curvature of DE is 0-0.2mm. -1 .

[0057] The fifth curve segment EF is connected to the fourth curve segment DE and an angle less than 90 degrees is formed therebetween. The fifth curve segment EF shrinks downward along the X direction from the point E as the starting point to form a convex curve. For example, the fifth curve segment EF can be a convex curve shrinking downward along the X direction by 0.03-0.1h1 from the point E as the starting point. The sixth curve segment FG shrinks downward along the X direction from the point F as the starting point to form a convex curve. For example, the sixth curve segment FG can be a convex curve shrinking downward along the X direction by 0.03-0.12h1 from the point F as the starting point. The angle between the fifth curve segment EF and the sixth curve segment FG is 15-75 degrees.

[0058] Through the above-mentioned setting, the dimensions of the guide surface 30 are limited, so that the specific shape of the guide surface 30 is similar to the bionic bird wing shape, which meets the air body flow dynamics design, reduces the flow resistance of the gas, reduces the power and cost, and improves the performance of the diversion mechanism. In addition, by fixing the two guide surfaces 30 on the top of the two inverted V-shaped sub-heat exchangers respectively, under the guiding effect of the two guide surfaces 30, the gas flowing out of the heat exchanger 2 is in a "Y" shape, thereby dividing the gas flowing through the two sub-heat exchangers into two obliquely upward air flows. The separation of the two air flows can avoid the air flow from generating annular vortices in a larger space, thereby avoiding the problems of flow loss, reduced air volume and abnormal noise caused by the annular vortex, which is conducive to improving the user experience. In addition, the air inlet 10 of the volute 1 is arranged on the left and right sides of the volute 1, so that the air inlet direction of the volute 1 is to discharge air to the left and right sides. The air discharge of the air inlets 10 on both sides can increase the flow propagation speed of the gas after internal heat exchange, thereby improving the working efficiency of the diversion mechanism and reducing the power consumption of the diversion mechanism.

[0059] In some embodiments, reference Figures 5 to 7 As shown, the second guide portion 4 includes a first curved surface segment 41 and a second curved surface segment 42 that are connected to each other. The first curved surface segment 41 and the second curved surface segment 42 are relatively arranged along the connection direction of the two air inlets 10 (i.e., the left and right direction), and the edges of the first curved surface segment 41 and the second curved surface segment 42 close to each other are connected to each other in the middle area of ​​the bottom of the volute 1. The first curved surface segment 41 and the second curved surface segment 42 are both extended in a direction away from each other and along the downstream side of the volute 1, that is, the first curved surface segment 41 and the second curved surface segment 42 are extended as a whole with a gradually higher trend. The first curved surface segment 41 and the second curved surface segment 42 can be arranged as a symmetrical structure or an asymmetrical structure. Through the above-mentioned arrangement, the gas at the bottom of the volute 1 is diverted on the basis of the guidance of the first guide portion 3, and then guided to the air inlets 10 on both sides of the volute 1 through the first curved surface segment 41 and the second curved surface segment 42, respectively, so that the airflow at the bottom of the volute 1 is further straightened through the first curved surface segment 41 and the second curved surface segment 42, thereby increasing the flow speed of the gas and reducing the gas flow resistance at the bottom of the volute 1.

[0060] The width of the second guide portion 4 is equal to the width of the volute 1 along the X direction, and the edges of the first curved surface segment 41 and the second curved surface segment 42 away from each other are consistent with the outer peripheral contour line of the volute 1, and the edges of the first curved surface segment 41 and the second curved surface segment 42 away from each other can be arranged to have a certain curvature. In this way, when the airflow passes through the edges of the first curved surface segment 41 and the second curved surface segment 42 away from each other, the smooth edges can reduce the disturbance to the airflow, so that the gas flowing out of the heat exchanger 2 can flow along the plate surface of the first curved surface segment 41 and the second curved surface segment 42, and directly flow into the air inlet 10 on both sides of the volute 1, so that the flow of the gas is smoother and softer, the noise of the gas flow is reduced, and the gas flow rate is increased.

[0061] Furthermore, the edges of the first curved surface segment 41 and the second curved surface segment 42 close to each other gradually protrude and extend toward the top of the heat exchanger 2 to form a guide ridge 40 at the connection position of the first curved surface segment 41 and the second curved surface segment 42. The guide ridge 40 can quickly divert the gas flowing from the heat exchanger 2 to the middle area of ​​the bottom of the volute 1, further straighten the airflow at the bottom of the volute 1, and reduce the gas flow resistance at the bottom of the volute 1. The cross-section of the guide ridge 40 along the X direction is an arc segment HI, and the radius of the arc segment HI is 0.5-5mm. The guide ridge 40 can effectively prevent a large amount of gas flowing through the heat exchanger 2 from directly impacting the bottom of the volute 1 and generating a large noise, and without affecting the air intake of the air inlets 10 on both sides of the volute 1, the gas flow at the bottom of the volute 1 is smoother, which helps to further reduce the noise.

[0062] The width p of the second air guide portion along the connecting direction of the two air inlets is 200-350 mm, the length l of the second air guide portion is 350-500 mm, the height q of the first curved surface segment and the second curved surface segment in the direction away from the second end of the volute 1 and close to the first end of the inverted V-shaped sub-heat exchanger is 25-80 mm, the height a of the third curved surface segment in the direction away from the second end of the volute 1 and close to the first end of the inverted V-shaped sub-heat exchanger is 100-140 mm, and the height b of the fourth curved surface segment in the direction away from the second end of the volute 1 and close to the first end of the inverted V-shaped sub-heat exchanger is 120-160 mm.

[0063] In some embodiments, reference Figure 5As shown, the first curved surface segment 41 and the second curved surface segment 42 are symmetrically arranged along the connecting direction of the two air inlets 10, and the cross-section of the first curved surface segment 41 along the connecting direction of the two air inlets 10 forms a third curved shape. In the direction from the middle area of ​​the second end (i.e., the bottom) of the volute 1 to the air inlet 10 on one side of the volute 1, that is, along the X-direction, the third curved shape includes a seventh curved segment IJ and an eighth curved segment JK connected in sequence, with point I as the starting point, the seventh curved segment IJ is a concave curve that shrinks and extends inward in the direction close to the second end of the volute 1, and with point J as the starting point, the eighth curved segment JK is a convex curve that shrinks and extends inward in the direction close to the second end of the volute 1.

[0064] It should be noted that the above-mentioned limitation on the extension direction of the first curved surface segment 41 is based on how the first curved surface segment 41 extends relative to the volute 1. Since the first curved surface segment 41 extends upward in the direction of the volute 1 as a whole relative to the volute 1, the first curved surface segment 41 is an inward extension. In addition, each curve of the first curved surface segment 41 has a straight line connecting the two ends, and each curve is a concave curve if it is above the straight line connecting the two ends, and a convex curve if it is below the straight line.

[0065] In a specific embodiment, when the air handling unit is installed vertically in the height direction, the heat exchanger 2 is located below the volute 1, that is, when the air flows in the vertical direction, the seventh curve segment IJ and the eighth curve segment JK are thickened by 0.3-2 mm in the direction of the volute 1. Taking point I as the starting point, the seventh curve segment IJ is an upward convex curve moving upward in the height direction of the volute 1, for example, the seventh curve segment IJ can be an upward convex curve moving upward by 0.3-0.6q along Z. Taking point J as the starting point, the eighth curve segment JK is a downward convex curve moving upward in the height direction of the volute, for example, the eighth curve segment JK can be a downward convex curve moving upward by 0.3-0.6q along Z.

[0066] Further, refer to Figure 7 As shown, the second guide portion 4 is extended along the outer contour line of the bottom of the volute 1, and the extension direction of the second guide portion 4 is the length direction of the second guide portion 4, that is, the second guide portion 4 is arranged at the bottom of the volute 1 along the Y direction. The distance between the top of the first guide portion 3 and the bottom of the second guide portion 4 along the Z direction is 10-60mm, which can be flexibly set according to the installation distance between the various components in the diversion mechanism. For example, the top of the first guide portion 3 and the bottom of the second guide portion 4 can be 20mm, or 30mm, 40mm or 50mm. One side edge of the first curved segment 41 close to the second curved segment 42 is formed into an arc segment MN along the Y direction, and the seventh curved segment IJ and the eighth curved segment KJ are swept along the arc segment MN to form the first curved segment 41.

[0067] The second air guide 4 also includes a third curved surface segment 43 and a fourth curved surface segment 44, which are arranged opposite to each other in a direction perpendicular to the connection direction of the two air inlets 10, and the third curved surface segment 43 and the fourth curved surface segment 44 are at an angle to each other, and can be adaptively arranged according to the two opposite side surfaces of the bottom of the volute 1. That is, the third curved surface segment 43 and the fourth curved surface segment 44 are arranged opposite to each other along the Y direction, the third curved surface segment 43 is connected to the first curved surface segment 41 and the second curved surface segment 42 on one side edge along the connection direction perpendicular to the two air inlets 10, and the fourth curved surface segment 44 is connected to the first curved surface segment 41 and the second curved surface segment 42 on the other side edge along the connection direction perpendicular to the two air inlets 10, thereby forming a complete second air guide 4.

[0068] The third curved surface segment 43 is formed into a fourth curve type along a cross section perpendicular to the connection direction of the two air inlets 10, and the fourth curve type includes a ninth curve segment QN. The third curved surface segment 43 is formed by the ninth curve segment QN sweeping from the central area of ​​the second end (i.e., the bottom) of the volute 1 to the air inlets 10 on both sides of the volute 1. The ninth curve segment QN can be an arc with a radius of 80-100mm. The fourth curved surface segment 44 is formed into a fifth curve type along a cross section perpendicular to the connection direction of the two air inlets 10. The fifth curve type includes a tenth curve segment PM. The fourth curved surface segment 44 is formed by the tenth curve segment PM sweeping from the central area of ​​the second end (i.e., the bottom) of the volute 1 to the air inlets 10 on both sides of the volute 1. The tenth curve segment PM can be an arc with a radius of 65-95mm. Through the above-mentioned settings, the dimensions of the second guide part 4 are defined, so that the specific shape of the second guide part 4 is similar to the bionic bird wing shape, which meets the air body flow dynamics design, reduces the flow resistance of the gas, reduces the power and cost, and improves the performance of the diversion mechanism. According to the superior characteristics of the airfoil guide structure, based on the theory of air flow dynamics and the Bernoulli equation, the cross-section of the first guide portion 3 and the second guide portion 4 along the X direction is set to an airfoil. Through this structural feature, the impact and interference at the bottom of the volute 1 can be reduced, and the airflow fluctuation at the bottom of the volute 1 can be reduced, so that most of the gas can flow into the air inlets 10 on both sides of the volute 1 along the first guide portion 3 and the second guide portion 4 accordingly.

[0069] It should be noted that the above-mentioned setting of the second guide portion 4 is only an exemplary setting mode. In actual application, the second guide portion 4 can also remove the third curved surface segment 43 and the fourth curved surface segment 44, and only include the first curved surface segment 41 and the second curved surface segment 42. The gas flowing out from the top of the heat exchanger 2 flows to the first curved surface segment 41 and the second curved surface segment 42 respectively. Since the edges of the first curved surface segment 41 and the second curved surface segment 42 away from each other are consistent with the outer peripheral contour line of the volute 1, the structural transition between the two curved surface segments and the air inlet 10 is reduced, so that the gas flow process here is There is no big obstacle in the volute 1, so part of the gas on one side of the volute 1 can flow smoothly into the air inlet 10 on one side along the edge of the first curved surface section 41, and part of the gas on the other side of the volute 1 can flow smoothly into the air inlet 10 on the other side along the edge of the second curved surface section 42, thereby greatly improving the air intake speed of the volute 1, and making the air inlets 10 on both sides of the volute 1 have sufficient air intake volume and uniformity of the flow field, reducing the air flow turbulence and air flow fluctuation there, increasing its forward pressure gradient and reducing the noise of the air intake process of the volute 1, and improving the user experience. In some other embodiments, the second guide part 4 can also be a complete guide plate structure. According to the actual application situation, the second guide part 4 is set to a guide plate structure that matches the bottom of the volute 1, which can also realize the rapid diversion of the gas at the bottom of the volute 1 and guide it to the air inlets 10 on both sides of the volute 1 respectively.

[0070] It should be noted that the size limitation of the first flow guide 3 and the second flow guide 4 in the above embodiment is only an exemplary setting method. In actual application, the specific size and shape of the first flow guide 3 can be adaptively set according to the actual shape and specifications of the heat exchanger 2, and the specific size and shape of the second flow guide 4 can be adaptively set according to the actual shape and specifications of the bottom of the volute 1, so as to ensure that the two flow guides are respectively adapted to the bottom of the volute 1 and the top of the heat exchanger 2, and reduce the eddy flow area at the top of the heat exchanger 2 and the bottom of the volute 1, thereby reducing the gas flow loss. In addition, the materials of the first flow guide 3 and the second flow guide 4 can be the same or different. If the materials of the first flow guide 3 and the second flow guide 4 are metal, the first flow guide 3 and the second flow guide 4 can be welded to the corresponding positions of the bottom of the volute 1 and the top of the heat exchanger 2 respectively. If the materials of the first flow guide 3 and the second flow guide 4 are plastic, the first flow guide 3 and the second flow guide 4 can be bonded to the corresponding positions of the bottom of the volute 1 and the top of the heat exchanger 2 respectively. The first guide part 3 and the second guide part 4 provided in the present disclosure have simple structures and require fewer parts to be assembled. Therefore, it is convenient and quick to assemble the diversion mechanism, and the parts fit closely together.

[0071] The heat exchanger 2 of the diversion mechanism provided in the present disclosure is located at the bottom of the volute 1, and a vortex zone is formed between the heat exchanger 2 and the bottom of the volute 1. In the prior art, when the first guide part 3 and the second guide part 4 are not installed, there is a relatively obvious vortex zone between the heat exchanger 2 and the bottom of the volute 1, and the range of the vortex zone is relatively large, so that part of the gas flowing through the heat exchanger 2 needs to flow through two 90° turns before reaching the entrance of the volute 1, resulting in low air intake efficiency at the air inlet 10 of the volute 1, and will cause the volute 1 to make a large noise, and the gas flow loss of the volute 1 is large, and the power consumption is large. After installing the first guide part 3 and the second guide part 4 in the present disclosure, the vortex zone between the heat exchanger 2 and the volute 1 is significantly reduced, so that the turning angle of the gas flowing through the heat exchanger 2 in the process of flowing to the air inlets 10 on both sides of the volute 1 is reduced, thereby reducing the loss of gas flow and reducing power. The flow dividing mechanism provided by the present invention has a simple overall structure and is practical. The structure of the present invention has been verified by experiments. Part of the gas after heat exchange in the heat exchanger 2 can flow to the air inlets 10 on both sides of the volute 1 along the first flow guiding part 3 under the guiding effect of the first flow guiding part 3 with a gradually rising trend toward the air inlets 10 on both sides. The eddy flow area between the heat exchanger 2 and the volute 1 can be reduced by the first flow guiding part 3. The remaining part of the gas can be further guided to the air inlets 10 on both sides of the volute 1 along the second flow guiding part 4 under the guiding effect of the second flow guiding part 4 with a gradually rising trend toward the air inlets 10 on both sides. The first flow guiding part 3 and the second flow guiding part 4 are connected to each other. The guide portion 4 can make the gas flow direction of the heat exchanger 2 and the bottom of the volute 1 consistent, and uniformly guide the gas near the air inlet 10 on one side of the volute 1 to the air inlet 10 on this side, and uniformly guide the gas near the air inlet 10 on the other side of the volute 1 to the air inlet 10 on the other side, so that the effect of guiding the gas between the heat exchanger 2 and the bottom of the volute 1 through the first guide portion 3 and the second guide portion 4 is better, and the turning angle of the gas flowing through the heat exchanger 2 in the process of flowing to the air inlets 10 on both sides of the volute 1 is reduced, thereby reducing the gas flow loss, and can achieve the effect of reducing the power of the diversion mechanism by 5%-10%.

[0072] The flow splitting mechanism provided in the present disclosure uses the Q criterion to mark and evaluate the vortex structure at the bottom of the heat exchanger 2 and the volute 1, that is, the Q isosurface is drawn to display the vortex structure. The Q isosurface is constructed as follows:

[0073]

[0074] Among them, x, y and z represent radial, circumferential and axial directions respectively, and u, v and w represent radial velocity component, circumferential velocity component and axial velocity component respectively.

[0075] When Q=0.01, compared with the vortex structure, after installing the first guide part 3 and the second guide part 4, the vortex structure between the heat exchanger 2 and the bottom of the volute 1 is significantly reduced, and the velocity gradient The corresponding power loss is reduced, and the power consumption is also reduced accordingly.

[0076] Some other embodiments of the present disclosure further provide an air handling unit, comprising a flow dividing mechanism as described in any of the above embodiments. Specifically, the air handling unit may be an air conditioner or a duct unit.

[0077] In some embodiments, the air handling unit is a suction-type vertical duct unit, which includes an indoor unit, which includes a shell and a motor contained in the shell and a diversion mechanism of any of the above embodiments, the diversion mechanism includes a centrifugal fan, the centrifugal fan includes a volute 1 and an impeller arranged in the volute 1, the fan is used to drive external air into the shell, when the centrifugal fan is working, the high-speed rotation of the impeller causes the gas to flow through the evaporator and then be axially sucked into the impeller through the air inlet of the volute 1, turn 90° in the impeller, flow through the impeller channel and discharge from the impeller, and finally the gas thrown out of the impeller is concentrated and guided by the volute 1 or other flow channel structures and then discharged from the air outlet. The technical features of the diversion mechanism used in the air handling unit can refer to the diversion mechanism in the above embodiment, so that part of the gas after heat exchange in the heat exchanger 2 can be divided into two parts of airflow under the guiding action of the first guide part 3, and the two parts of airflow flow along the first guide part 3 to the air inlets 10 on both sides of the volute 1 respectively. The vortex area between the heat exchanger 2 and the volute 1 can be reduced by the first guide part 3, and the remaining part of the gas can be guided by the second guide part 4 to the air inlets 10 on both sides of the volute 1 with a gradually increasing trend. The turning angle of the gas flowing through the heat exchanger 2 in the process of flowing to the air inlets 10 on both sides of the volute 1 is reduced, thereby reducing the loss of gas flow. While reducing the power of the duct machine, it does not affect the overall performance of the duct machine. In addition, the components of the diversion mechanism have a simple structure, a compact installation position, and occupy a small space in the internal unit of the duct machine, so that the internal structure of the duct machine is compact, which is beneficial to control the overall size of the internal unit of the duct machine and reduce the production cost of the duct machine.

[0078] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0079] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diversion mechanism, characterized in that: include: A volute, wherein air inlets are respectively arranged on both sides of the volute; a heat exchanger, arranged on the upstream side of the volute along the airflow direction; A first flow guide portion, disposed at a first end of the heat exchanger; A second flow guide portion is disposed at a second end of the volute, the first end and the second end being spaced apart and facing each other; The first guide portion and the second guide portion are configured to guide the airflow flowing through the first end of the heat exchanger to the air inlets on both sides of the volute.

2. The flow diversion mechanism according to claim 1, characterized in that: The first flow guide portion includes at least one flow guide surface extending in a direction away from a center of the first end of the heat exchanger and along a downstream side of the heat exchanger.

3. The flow diversion mechanism according to claim 2, characterized in that: The heat exchanger comprises: Two inverted V-shaped sub-heat exchangers, the two inverted V-shaped sub-heat exchangers are sequentially arranged along the communication direction of the two air inlets, and the two inverted V-shaped sub-heat exchangers together form an M-shaped heat exchanger; and The two guide surfaces are symmetrical along the center of the heat exchanger, and the two guide surfaces are respectively arranged at the first ends of the two inverted V-shaped sub-heat exchangers.

4. The flow diversion mechanism according to claim 3, characterized in that: Each of the guide surfaces includes a first guide section and a second guide section that are connected to each other, one end of the first guide section is located at an end of the inverted V-shaped sub-heat exchanger on one side away from the air inlet, and the other end extends toward the other side of the inverted V-shaped sub-heat exchanger and close to the air inlet, one end of the second guide section is located at an end of the inverted V-shaped sub-heat exchanger on one side close to the air inlet, and the other end extends toward the air inlet on the corresponding side, and an edge of one side of the first guide section adjacent to the air inlet is connected to an edge of one side of the second guide section adjacent to the air inlet.

5. The flow diversion mechanism according to claim 4, characterized in that: The cross section of the first guide section along the connecting direction of the two air inlets is in a first curve shape. In the direction from the middle area of ​​the second end of the volute to the air inlet on one side of the volute, the first curve shape includes a first curve segment AB, a second curve segment BC, a third curve segment CD, and a fourth curve segment DE connected in sequence. With point A as the starting point, the first curve segment AB is tangent to a vertical line of a preset distance extending outward from point A in a direction close to the other guide surface to form a convex curve. The second curve segment BC extends outward from point B in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a convex curve. The third curve segment CD extends outward from point C in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve. The fourth curve segment DE extends outward from point D in a direction away from the first end of the inverted V-shaped sub-heat exchanger to form a concave curve. The cross-section of the second guide section along the connecting direction of the two air inlets is in a second curved shape. In the direction from the air inlet on one side of the volute to the middle area of ​​the second end of the volute, the second curved shape includes a fifth curved segment EF and a sixth curved segment FG connected in sequence. The fifth curved segment EF is connected to the fourth curved segment DE and an angle less than 90 degrees is formed therebetween. The fifth curved segment EF takes point E as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve. The sixth curved segment FG takes point F as a starting point and extends inwardly in a direction close to the first end of the inverted V-shaped sub-heat exchanger to form a convex curve.

6. The flow diversion mechanism according to claim 5, characterized in that: The width h1 of the guide surface along the connecting direction of the two air inlets is 80-100 mm, the height m of the guide surface along the direction away from the first end of the inverted V-shaped sub-heat exchanger and close to the second end of the volute is 0.1-0.5h1, an opening is formed between one end of the first guide section located on one side of the end of the inverted V-shaped sub-heat exchanger and one end of the second guide section located on the other side of the end of the inverted V-shaped sub-heat exchanger, the dimension h2 of the opening along the connecting direction of the two air inlets is 0.5-1h1, and the thickness d of the guide surface is 0.3-1.2 mm.

7. The flow diversion mechanism according to any one of claims 3 to 6, characterized in that: The second guide portion includes a first curved surface segment and a second curved surface segment connected to each other, the first curved surface segment and the second curved surface segment are arranged opposite to each other along the connecting direction of the two air inlets, and the edges of the first curved surface segment and the second curved surface segment close to each other are connected to each other in the middle area of ​​the second end of the volute, and the first curved surface segment and the second curved surface segment are both extended in a direction away from each other and along the downstream side of the volute.

8. The flow diversion mechanism according to claim 7, characterized in that: The edges of the first curved surface segment and the second curved surface segment away from each other are consistent with the outer peripheral contour line of the volute, and the edges of the first curved surface segment and the second curved surface segment close to each other gradually protrude and extend toward the first end of the heat exchanger to form a guide ridge at the connection position of the first curved surface segment and the second curved surface segment.

9. The flow diversion mechanism according to claim 7, characterized in that: The first curved surface segment and the second curved surface segment are symmetrically arranged along the connecting direction of the two air inlets, and the cross section of the first curved surface segment along the connecting direction of the two air inlets is formed into a third curved shape. In the direction from the middle area of ​​the second end of the volute to the air inlet on one side of the volute, the third curved shape includes a seventh curved segment IJ and an eighth curved segment JK connected in sequence. With point I as the starting point, the seventh curved segment IJ is a concave curve that shrinks and extends inwardly in the direction close to the second end of the volute, and with point J as the starting point, the eighth curved segment JK is a convex curve that shrinks and extends inwardly in the direction close to the second end of the volute; The second guide portion is extended along the outer contour line of the second end of the volute, and the extension direction of the second guide portion is the length direction of the second guide portion. The side edge of the first curved surface segment close to the second curved surface segment is formed as an arc segment MN along the length direction of the second curved surface segment, and the seventh curved segment IJ and the eighth curved segment KJ are swept along the arc segment MN to form the first curved surface segment.

10. The flow diversion mechanism according to claim 7, characterized in that: The second air guide portion also includes a third curved surface segment and a fourth curved surface segment, and the third curved surface segment and the fourth curved surface segment are arranged opposite to each other in a direction perpendicular to the connection direction of the two air inlets, the third curved surface segment is connected to the first curved surface segment and the second curved surface segment on one side edge along the direction perpendicular to the connection direction of the two air inlets, and the fourth curved surface segment is connected to the first curved surface segment and the second curved surface segment on the other side edge along the direction perpendicular to the connection direction of the two air inlets.

11. The flow diversion mechanism according to claim 10, characterized in that: The heat exchanger is located below the volute, the third curved surface segment is formed into a fourth curved shape along a cross section perpendicular to the connecting direction of the two air inlets, the fourth curved shape includes a ninth curved segment QN, and the third curved surface segment is formed by the ninth curved segment QN sweeping from the central area of ​​the second end of the volute to the air inlets on both sides of the volute; The fourth curved surface segment forms a fifth curve type along a cross section perpendicular to the connecting direction of the two air inlets, and the fifth curve type includes a tenth curved surface segment PM. The fourth curved surface segment is formed by the tenth curved surface segment PM sweeping from the central area of ​​the second end of the volute to the air inlets on both sides of the volute.

12. The flow dividing mechanism according to claim 10 or 11, characterized in that: The width p of the second air guide portion along the connecting direction of the two air inlets is 200-350 mm, the length l of the second air guide portion is 350-500 mm, the height q of the first curved surface segment and the second curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 25-80 mm, the height a of the third curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 100-140 mm, and the height b of the fourth curved surface segment in the direction away from the second end of the volute and close to the first end of the inverted V-shaped sub-heat exchanger is 120-160 mm.

13. An air handling unit, characterized in that: Comprising the diversion mechanism as described in any one of claims 1 to 12.

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