Impeller, fan, and air handler

Abstract

An impeller, a fan, and an air handler. The impeller comprises: a first end plate (110), a second end plate (120), and multiple blades (130) distributed at intervals in the circumferential direction of the impeller (100), wherein the second end plate (120) is provided with an air inlet (140), and the second end plate (120) and the first end plate (110) are distributed spaced from each other in the air intake direction of the impeller (100). The blades (130) are connected to the first end plate (110) and the second end plate (120); the first end plate (110) comprises a first plate portion (111) and a second plate portion (112) arranged around the periphery of the first plate portion (111); and the second plate portion (112) has a nonlinear shape on a cross section passing through the axis of the impeller (100), and tilts away from the second end plate (120) in a direction moving away from the axis of the impeller (100). The impeller, the fan, and the air handler can reduce the flow loss when an airflow enters the impeller, thereby improving the fan efficiency.

Description

Impellers, fans and air handling units

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 23, 2024, with application number 202420347772.1 and application name “Impeller, Fan and Air Handling Unit”, the entire contents of which are incorporated by reference into this application.

[0003] This application claims priority to the Chinese patent application filed with the China Patent Office on May 21, 2024, with application number 202410636952.6 and application name “Impeller and fan for fan”, the entire contents of which are incorporated by reference into this application. Technical Field

[0004] The present application relates to the technical field of fans, and in particular to an impeller, a fan and an air handling unit. Background Art

[0005] The impeller used in a centrifugal fan usually includes two end plates arranged opposite to each other and a plurality of blades arranged between the two end plates. The end plates are usually arranged in a flat plate structure, which leads to large flow loss and turning loss when the airflow enters the impeller, thereby resulting in low efficiency of the centrifugal fan.

[0006] Public content

[0007] One object of the present application is to provide an impeller.

[0008] Another object of the present application is to provide a fan comprising the aforementioned impeller.

[0009] Another object of the present application is to provide an air handling unit, comprising the aforementioned fan, or comprising the aforementioned impeller.

[0010] According to the impeller of the first aspect embodiment of the present application, the impeller includes a first end plate, a second end plate and a plurality of blades spaced apart along the circumference of the impeller, the second end plate is provided with an air inlet, and the second end plate and the first end plate are spaced apart along the air inlet direction of the impeller; the blades connect the first end plate and the second end plate, the first end plate includes a first plate portion and a second plate portion arranged around the periphery of the first plate portion, the second plate portion has a non-linear shape in a cross section passing through the impeller axis, and is inclined in a direction away from the impeller axis in a direction away from the second end plate.

[0011] In addition, the impeller according to the above embodiment of the present application may also have the following additional technical features:

[0012] In some embodiments, the cross section is radially divided into at least two segments, the at least two segments including a first segment close to the impeller axis and a second segment away from the impeller axis, and an angle a1 between the first segment and the impeller axis is greater than an angle a2 between the second segment and the impeller axis.

[0013] In some embodiments, an angle between at least one of the at least two sections and the impeller axis gradually decreases in a direction away from the impeller axis.

[0014] In some embodiments, at least one of the at least two segments has a constant angle with the impeller axis in a direction away from the impeller axis.

[0015] In some embodiments, at least one of the at least two segments is in a straight line shape.

[0016] In some embodiments, at least one of the at least two segments is in a smooth arc shape and departs from the first end plate in a direction away from the impeller axis, and an angle between the segment and the impeller axis gradually decreases.

[0017] In some embodiments, two adjacent sections of the at least two sections transition smoothly; and the at least two sections transition smoothly with the first plate portion.

[0018] In some embodiments, the angle a between the cross section and the impeller axis gradually decreases.

[0019] In some embodiments, the cross section is a smooth curve.

[0020] In some embodiments, the included angle a between the second plate portion and the impeller axis is configured to be 30°≤a≤90°.

[0021] In some embodiments, a radial span L of the second plate portion and an outer diameter D1 of the second end plate satisfy 10%≤L / D1≤25%.

[0022] In some embodiments, 14%≤L / D1≤18%.

[0023] In some embodiments, the first end plate outer diameter D2 and the second end plate outer diameter D1 satisfy 50%≤D2 / D1≤100%.

[0024] In some embodiments, 60%≤D2 / D1≤70%.

[0025] In some embodiments, the first plate portion is opposite to the air inlet along the impeller axis, and a projection of the air inlet on the first end plate along the impeller axis falls into the first end plate.

[0026] In some embodiments, a cross section of the first plate portion passing through the impeller axis is in a straight line shape and is perpendicular to the impeller axis.

[0027] In some embodiments, an inner edge of the blade end is connected to the first plate portion, and an outer edge is connected to the second plate portion.

[0028] The impeller according to the embodiment of the second aspect of the present application includes: a second end plate, a first end plate and a plurality of blades, the second end plate is provided with an air inlet, the first end plate and the second end plate are spaced apart and arranged relative to each other; the plurality of blades are distributed at intervals along the circumference of the impeller, the blades have a blade trailing edge that faces away from the axis of the impeller, wherein the blade trailing edge includes a third section, the third section extends obliquely in a direction away from the second end plate, and the inclination direction is opposite to the rotation direction of the impeller when working.

[0029] In addition, the impeller according to the above embodiment of the present application may also have the following additional technical features:

[0030] In some embodiments, the third section extends in a direction away from the second end plate to an edge of the blade at an end close to the first end plate.

[0031] In some embodiments, an angle γ between the third segment and the axis is greater than or equal to 10° and less than 90°.

[0032] In some embodiments, the third segment is configured as a straight line segment; or, the third segment is configured as an arc segment; or, in the direction away from the second end plate, the third segment is configured as an arc segment, and the inclination angle of the tangent of the third segment relative to the axis gradually increases.

[0033] In some embodiments, the blade trailing edge further includes a fourth segment, the fourth segment is closer to the second end plate than the third segment, and an angle α is formed between the third segment and the fourth segment.

[0034] In some embodiments, the fourth segment extends obliquely in a direction away from the second end plate, and has the same inclination direction as the third segment.

[0035] In some embodiments, the angle α between the third segment and the fourth segment satisfies 10°≤α≤60.

[0036] In some embodiments, 40°≤α≤52°.

[0037] In some embodiments, the fourth segment is configured as a straight line segment; or, the fourth segment is configured as an arc segment; or, the fourth segment is configured as an arc segment, and the inclination angle of the tangent of the fourth segment relative to the axis gradually increases.

[0038] In some embodiments, the fourth segment extends obliquely in a direction away from the second end plate, and in an opposite direction to the inclination of the third segment; or, the fourth segment is coplanar with the axis.

[0039] In some embodiments, the fourth segment and the axis have an angle β therebetween, wherein 0°≤β≤50°.

[0040] In some embodiments, 0°≤β≤20°.

[0041] In some embodiments, there is a transition section between the third section and the fourth section, wherein the third section and the transition section are smoothly transitioned, and / or the fourth section and the transition section are smoothly transitioned; and / or the transition section is an arc section.

[0042] In some embodiments, the fourth section extends toward the second end plate to an edge of an end of the blade adjacent to the second end plate.

[0043] In some embodiments, in the axial direction, the height dimension of the blade is H1, and the height dimension of the fourth section is H3, wherein 10%≤H3 / H1≤75%.

[0044] In some embodiments, 40%≤H3 / H1≤70%.

[0045] In some embodiments, in the axial direction, the height dimension of the blade is H1, and the height dimension of the third section is H2, wherein 10%≤H2 / H1≤90%.

[0046] In some embodiments, 15%≤H2 / H1≤60%.

[0047] In some embodiments, the first end plate includes a second plate portion, the second plate portion extends in a radially outward direction of the impeller and in a direction away from the second end plate, and the blades are connected to the second plate portion.

[0048] In some embodiments, the first end plate further includes a first plate portion, and the second plate portion is connected to an outer periphery of the first plate portion and is disposed around the first plate portion.

[0049] According to the fan in the embodiment of the present application, the fan includes a motor and an impeller as described in any one of the above items, and the motor is arranged on the first end plate of the impeller.

[0050] The present application also provides an air handling unit, which includes the aforementioned impeller or fan.

[0051] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0053] FIG1 is a schematic diagram of the cross-sectional structure of an impeller in some embodiments of the present application.

[0054] FIG2 is a schematic diagram of the cross-sectional structure of an impeller in some embodiments of the present application.

[0055] FIG3 is a partial enlarged view of area A in FIG2 .

[0056] FIG4 is a schematic diagram of the cross-sectional structure of an impeller in some other embodiments of the present application.

[0057] FIG5 is a partial enlarged view of area B in FIG4 .

[0058] FIG6 is a schematic diagram of the three-dimensional structure of the impeller in some embodiments of the present application.

[0059] FIG7 is a schematic diagram of the three-dimensional structure of the impeller in some embodiments of the present application.

[0060] FIG8 is a schematic diagram of an impeller according to some embodiments of the present application (first perspective).

[0061] FIG9 is a schematic diagram of an impeller according to some embodiments of the present application (second perspective).

[0062] FIG10 is a schematic diagram of an impeller according to some embodiments of the present application (from a third perspective).

[0063] FIG11 is a schematic diagram of an impeller according to some other embodiments of the present application.

[0064] FIG12 is a schematic diagram of an impeller according to some embodiments of the present application (from a fourth perspective).

[0065] FIG13 is a schematic cross-sectional view of the impeller according to an embodiment of the present application.

[0066] FIG. 14 is a simplified cross-sectional structural diagram of an air handling unit according to some embodiments of the present application.

[0067] Reference numerals:

[0068] First end plate 110, first plate portion 111, second plate portion 112, second end plate 120, blade 130, first end portion 130a, second end portion 130b, blade trailing edge 131, third section 1311, fourth section 1312, transition section 1313, blade leading edge 132, impeller axis C, air inlet 140, first section 113, second section 114, air handling unit 200, heat exchanger 210. Modes for Carrying Out the Invention

[0069] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0070] This application provides an impeller 100, a fan, and an air handler 200, each of which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For details not described in one embodiment, please refer to the relevant descriptions of other embodiments.

[0071] An embodiment of the present application is described in detail below. As shown in Figure 1, the impeller 100 in the embodiment of the present application includes a first end plate 110, a second end plate 120, and a plurality of blades 130 distributed at intervals along the circumference of the impeller 100. The second end plate 120 is provided with an air inlet 140. The second end plate 120 and the first end plate 110 are distributed at intervals along the air intake direction of the impeller 100; the blades 130 connect the first end plate 110 and the second end plate 120. The first end plate 110 includes a first plate portion 111 and a second plate portion 112 arranged on the periphery of the first plate portion 111. The second plate portion 112 has a non-linear shape in a cross section passing through the axis of the impeller 100, and is inclined in a direction away from the second end plate 120 in a direction away from the axis of the impeller 100.

[0072] Specifically, the impeller 100 includes a first end plate 110, a second end plate 120, and blades 130. The second end plate 120 and the first end plate 110 are spaced apart from each other in the air intake direction, and the blades 130 connect the first end plate 110 and the second end plate 120. The second end plate 120 is provided with an air inlet 140 to receive the airflow entering the impeller 100. The gap between the first end plate 110 and the second end plate 120 can guide and promote the fluid to enter the impeller 100 and pass through the blades 130. The first end plate 110 and the second end plate 120 can provide basic support and fixing functions, so that the blades 130 can be stably mounted on the impeller 100. The blades 130 include a plurality of blades 130 spaced apart along the circumference of the impeller 100. When the airflow enters the impeller 100 through the air inlet 140, the rotation of the blades 130 generates power, thereby driving the flow of the airflow. The first end plate 110 includes a first plate portion 111 and a second plate portion 112. The first plate portion 111 and the second plate portion 112 are connected, and the second plate portion 112 is disposed around the periphery of the first plate portion 111. The first plate portion 111 supports and secures the blades 130 to mount them on the impeller 100. In a cross-section passing through the axis of the impeller 100, the second plate portion 112 has a non-linear shape, for example, a curved shape or a combination of a curved and a straight shape. The second plate portion 112 tilts away from the axis of the impeller 100, away from the second end plate 120. That is, the distance between the second plate portion 112 and the second end plate 120 gradually increases as the distance away from the axis of the impeller 100 increases. The non-linear shape of the second plate portion 112 allows the airflow to flow more smoothly out of the impeller 100, reducing flow disturbances and unnecessary resistance, thereby reducing flow losses. Through reasonable curve design, the non-linear second plate portion 112 can reduce the turning angle that the airflow must undergo when flowing out of the impeller 100, reducing vortices and energy loss generated during the turning process, thereby improving the efficiency of the impeller 100. In addition, the non-linear second plate portion 112 can also control the flow rate, flow direction, and vortex generation of the airflow, making the airflow more stable, reducing backflow and vortices, and thus reducing energy loss and vortex loss of the airflow.

[0073] According to the impeller 100 in the embodiment of the present application, by combining the shapes of the first plate portion 111 and the second plate portion 112, the dynamic effect of the airflow can be optimized while fixing the blades 130, the flow direction of the airflow can be controlled, the flow loss and turning loss of the airflow can be reduced, and the working efficiency of the impeller 100 can be improved.

[0074] Referring to FIG. 1 , in some embodiments, the cross section is radially divided into at least two segments. The cross section can be divided into two, three, four, or five segments. The at least two segments include a first segment 113 close to the axis of the impeller 100 and a second segment 114 further away from the axis of the impeller 100. That is, the first segment 113 is closer to the axis of the impeller 100 than the second segment 114, and the second segment 114 is further away from the axis of the impeller 100 than the first segment 113. For example, the first segment 113 can be the end of the second plate portion 112 close to the axis of the impeller 100, and the second segment 114 can be the end further away from the axis of the impeller 100. The angle between the first segment 113 and the axis of the impeller 100 is a1, and the angle between the second segment 114 and the axis of the impeller 100 is a2, with the angle a1 being greater than the angle a2. In the present application, the first section 113 may be in the shape of a curve, a broken line, a curve, or a combination thereof. When the first section 113 is a straight line, the angle a1 is the angle between the straight line and the axis of the impeller 100, and this angle is greater than the maximum angle a2 between the second section 114 and the axis of the impeller 100. When the first section 113 is a non-straight line, the angle a1 is the angle between the tangent of the first section 113 at different positions and the axis of the impeller 100. The angle a1 being greater than the angle a2 means that the angle between the tangent at each position of the first section 113 and the axis of the impeller 100 is greater than the angle between the second section 114 and the axis of the impeller 100. Furthermore, the second section 114 may also be in the shape of a curve, a broken line, a curve, or a combination thereof. The angle between the second section 114 and the axis of the impeller 100 can refer to the previous description.

[0075] By making the angle a1 between the first section 113 and the axis of the impeller 100 greater than the angle a2 between the second section 114 and the axis of the impeller 100, a relatively smooth change in the angle between the second plate portion and the impeller axis can be achieved, and a smooth transition of the airflow from the first plate portion 111 to the second plate portion 112 can be achieved. The airflow will turn more smoothly when leaving the impeller 100, which can reduce the vortex and turning loss generated when the airflow turns, optimize the distribution and flow direction control of the airflow, and improve the efficiency and performance of the impeller 100.

[0076] In some embodiments, at least one of the at least two sections has a gradually decreasing angle with the impeller 100 axis as it moves away from the impeller 100 axis. Alternatively, the angle between the tangent line of at least one section and the impeller 100 axis at different locations away from the impeller 100 axis gradually decreases. For example, the first section 113 or the second section 114 described above may be configured to have a gradually decreasing angle with the impeller 100 axis. Specifically, the angle between one section of the cross section and the impeller 100 axis may gradually decrease as it moves away from the impeller 100 axis, or any of the two or more sections may have a gradually decreasing angle with the impeller 100 axis as it moves away from the impeller 100 axis. The angle gradually decreases as it moves away from the impeller 100 axis, meaning that the angle between the airflow direction and the impeller 100 axis decreases as the distance from the impeller 100 axis increases. This facilitates a smooth change in the cross section away from the impeller axis. As the angle gradually decreases, energy loss as the airflow exits the impeller 100 is reduced, thereby improving the efficiency of the impeller 100.

[0077] In some embodiments, at least one of the at least two sections maintains a constant angle with the axis of the impeller 100 in a direction away from the axis of the impeller 100. Specifically, one of the at least two sections may maintain a constant angle with the axis of the impeller 100 in a direction away from the axis of the impeller 100, or any of the two or more sections may maintain a constant angle with the axis of the impeller 100 in a direction away from the axis of the impeller 100. The constant angle with the axis of the impeller 100 in a direction away from the axis of the impeller 100 means that the angle between the flow direction of the airflow in this section and the axis of the impeller 100 remains constant and does not change with increasing distance from the axis of the impeller 100. The flow velocity and flow direction of the airflow when passing through this section do not change significantly, and the flow state is relatively stable, which helps to improve the stability of the impeller 100.

[0078] In some embodiments, at least one of the at least two sections is in a straight line shape. It is understood that at least one section is in a straight line shape, and the angle between the second plate portion 112 in a straight line shape and the axis of the impeller 100 is fixed, that is, the angle between at least one section and the axis of the impeller 100 in the direction away from the axis of the impeller 100 remains unchanged. As with the above embodiment, the advantage of such a setting is that in this section, the airflow can flow out of the impeller 100 in a straight line, reducing the tortuosity of the flow and the generation of vortices, and achieving smooth flow. In the straight line section, the flow velocity and direction of the airflow change less when flowing through, which reduces flow losses and improves the efficiency of the impeller 100.

[0079] In some embodiments, at least one of the at least two sections is in the shape of a smooth arc and faces away from the first end plate 110 in a direction away from the axis of the impeller 100, and the angle between the second end plate portion 112 and the axis of the impeller 100 gradually decreases. It can be understood that at least one section is in the shape of a smooth arc, and the angle between the second end plate portion 112 and the axis of the impeller 100 is variable, and the angle between the second end plate portion 112 and the axis of the impeller 100 gradually decreases in a direction away from the axis of the impeller 100. Similar to the aforementioned embodiment, the angle between the direction of the airflow and the axis of the impeller 100 gradually decreases as the distance from the axis of the impeller 100 gradually increases. The airflow with a smaller angle with the axis of the impeller 100 is more likely to bypass the impeller 100 and flow out, which is beneficial to reducing flow loss and turning loss.

[0080] In some embodiments, adjacent segments of at least two segments transition smoothly; at least two segments transition smoothly with the first plate portion 111. Specifically, the second plate portion 112 transitions smoothly with the first plate portion 111, and the adjacent segments of the second plate portion 112 transition smoothly with each other. This smooth transition can reduce discontinuity and turbulence in the airflow between the two segments, lowering flow resistance and improving the efficiency of the impeller 100. This smooth transition can also mitigate airflow shock and disturbances, reduce vibration and noise, and improve the stability of the impeller 100. Furthermore, this smooth transition can reduce airflow impact and stress concentration on the impeller 100 and related accessories, reducing the risk of wear and fatigue and extending the service life of the equipment.

[0081] In some embodiments, the angle a between the cross section and the axis of the impeller 100 gradually decreases. Specifically, the angle a between the second plate portion 112 and the axis of the impeller 100 in the cross section passing through the axis of the impeller 100 generally decreases. As the angle a decreases, the direction of the airflow out of the impeller 100 gradually approaches the direction of the impeller 100 axis, reducing refraction and deflection of the airflow and reducing flow losses. The gradually decreasing angle a can increase the outflow velocity of the airflow at the outlet of the impeller 100, thereby improving the operating efficiency of the impeller 100.

[0082] In some embodiments, the cross-section of the second plate portion 112 is a smooth curve. Specifically, the second plate portion 112 is generally smooth and curved in a cross-section passing through the axis of the impeller 100. The smooth curve of the second plate portion 112 can reduce flow resistance, optimize airflow guidance, better guide airflow out of the impeller 100, and improve the operating efficiency and stability of the impeller 100.

[0083] In some embodiments, the angle a between the second plate portion 112 and the axis of the impeller 100 is configured to be 30°≤a≤90°. Specifically, the angle a between the second plate portion 112 and the axis of the impeller 100 is configured to be 30°≤a≤90°. For example, the angle a between the second plate portion 112 and the axis of the impeller 100 can be configured to be 30°, 40°, 45°, 80°, 85°, 90°, etc. In conjunction with the aforementioned embodiment, the second plate portion 112 includes at least a first section 113 and a second section 114. The angle formed between the first section 113 and the axis of the impeller 100 is a1, and the maximum angle formed between the second section 114 and the axis of the impeller 100 is a2. The angle a between the second plate portion 112 and the axis of the impeller 100 is configured to be 30°≤a≤90°. That is, the angle a1 between the first section 113 and the axis of the impeller 100 is configured to be 30°≤a1≤90°, and the maximum angle a2 between the second section 114 and the axis of the impeller 100 is configured to be 30°≤a2≤90°, with a2 being less than a1. This configuration can provide a suitable airflow deflection angle, accelerate the airflow at the outlet, reduce backflow and turbulence near the impeller 100, help reduce vibration and noise, and improve the operating efficiency of the impeller 100.

[0084] In some embodiments, the radial span L of the second plate portion 112 and the outer diameter D1 of the second end plate 120 satisfy 10% ≤ L / D1 ≤ 25%. Specifically, referring to FIG4 , the radial span L of the second plate portion 112 is L, and the outer diameter D1 of the second end plate 120 is D1. The ratio of the radial span L of the second plate portion 112 to the outer diameter D1 of the second end plate 120 can be set to 10% ≤ L / D1 ≤ 25%. For example, the ratio of L to D1 can be set to 10%, 13%, 18%, 20%, 22%, 25%, etc. By limiting the L / D1 ratio to an appropriate range, the structural strength and fluid dynamic performance of the impeller 100 can be balanced. When the ratio of L to D1 is too large, at the same outer diameter D1 of the second end plate 120, the radial span L of the second plate portion 112 is too large, and the airflow turns from radial to axial when passing through the impeller 100. The radial span is large, the turning loss is large, and the efficiency of the impeller 100 is low. When the ratio of L to D1 is too small, the radial span L of the second plate portion 112 is too small at the same outer diameter D1 of the second end plate 120. Such a small span L may restrict the flow of air around the second plate portion 112, increasing airflow resistance and thereby reducing the efficiency of the impeller 100. Furthermore, if the length of the first plate portion 111 remains unchanged, a second plate portion 112 with an excessively small span may result in the gaps between the blades 130 being too small to allow sufficient gas to pass through, leading to airflow obstruction and reduced airflow flow.

[0085] In some embodiments, the ratio of the radial span L of the second plate portion 112 to the outer diameter D1 of the second end plate 120 can be set within a range of 14% ≤ L / D1 ≤ 18%. For example, the ratio of L to D1 can be set to 14%, 14.5%, 15%, 17%, 17.5%, 18%, etc. This ratio range can be found by comprehensively considering the structural strength, fluid dynamics, and manufacturing cost of the impeller 100. By limiting the ratio of L to D1 to between 14% and 18%, the second plate portion 112 can be appropriately sized in the radial direction, thereby improving the operating efficiency of the impeller 100 while withstanding the operating pressure of the impeller 100. Of course, the selection of the above ratio range is based on engineering practice and experience. In different product designs and application scenarios, the ratio of the radial span L of the second plate portion 112 to the outer diameter D1 of the second end plate 120 can also range from greater than 18% or 25% to less than 14% or 10%, and this application does not impose any restrictions on this.

[0086] In some embodiments, the outer diameter D2 of the first end plate 110 and the outer diameter D1 of the second end plate 120 satisfy 50% ≤ D2 / D1 ≤ 100%. Specifically, referring to FIG4 , the outer diameter of the first end plate 110 is D2, and the outer diameter of the second end plate 120 is D1. The ratio of the outer diameter D2 of the first end plate 110 to the outer diameter D1 of the second end plate 120 can be set to 50% ≤ D2 / D1 ≤ 100%. For example, the ratio of D2 to D1 can be set to 50%, 55%, 60%, 80%, 95%, 100%, etc. By limiting the ratio of D2 to D1 to between 50% and 100%, an appropriate radial gap can be ensured between the first end plate 110 and the second end plate 120 to accommodate airflow and avoid excessive resistance. When the ratio of D2 to D1 is too large, the radial gap between the first end plate 110 and surrounding components is too large, resulting in airflow leakage or flow loss. Furthermore, airflow turns from radial to axial direction as it passes through impeller 100, resulting in a large radial span and significant turning losses, leading to low efficiency of impeller 100. When the ratio of D2 to D1 is too small, the diameter of first end plate 110 becomes too small, narrowing the radial gaps between adjacent blades 130. This makes it difficult for fluid to pass through impeller 100, increases flow resistance, and hinders airflow, reducing the efficiency of impeller 100. To maintain the same flow rate and speed requirements, a higher rotational speed is required, increasing energy consumption. At high rotational speeds, friction losses and air resistance increase, and noise levels are also higher.

[0087] In some embodiments, the outer diameter D2 of the first end plate 110 and the outer diameter D1 of the second end plate 120 can be set to 60%≤D2 / D1≤70%. For example, the ratio of D2 to D1 can be set to 60%, 62%, 65%, 68%, 70%, etc. Within this ratio range, an appropriate radial gap can be provided to ensure that the airflow can pass smoothly through the impeller 100 and reduce the risk of fluid leakage. At the same time, this ratio range can also provide structural strength and stability of the impeller 100 and reduce the adverse effects of excessive speed and high noise. Of course, the selection of the above ratio range is obtained through engineering practice and experience summary. In different product designs and application scenarios, the ratio range of the outer diameter D2 of the first end plate 110 and the outer diameter D1 of the second end plate 120 can also be greater than 70% or 100%, and less than 60% or 50%. This application does not impose any restrictions on this.

[0088] In some embodiments, the first plate portion 111 and the air inlet 140 are opposite to each other along the axis of the impeller 100, and the projection of the air inlet 140 on the first end plate 110 along the axis of the impeller 100 falls into the first end plate 110. Specifically, referring to Figures 6 and 7, axis C in the figures is the axis of the impeller 100, the first plate portion 111 is located on the first end plate 110 and surrounds the circumference of the axis of the impeller 100, the air inlet 140 is located on the second end plate 120 and surrounds the circumference of the axis of the impeller 100, the first end plate 110 and the second end plate 120 are opposite to each other along the axis of the impeller 100, and the first plate portion 111 and the air inlet 140 are opposite to each other along the axis of the impeller 100, which can better guide the airflow from the air inlet 140 into the impeller 100. The projection of the air inlet 140 on the first end plate 110 along the axis of the impeller 100 falls on the first end plate 110. It can be understood that on the projection plane perpendicular to the axis of the impeller 100, the diameter of the air inlet 140 is smaller than the diameter of the first end plate 110. Since the diameter of the air inlet 140 is small, when the air flow passes through the air inlet 140 and enters the internal space of the impeller 100 with a larger diameter, eddies or vortices may be generated. The gas moves at a higher speed in the vortex, which helps to increase the flow speed of the air flow; in addition, the diameter of the air inlet 140 is smaller than the diameter of the first end plate 110. When the air flow passes through the air inlet 140, it will cause compression of the air flow, thereby increasing the frequency of mutual collisions between gas molecules, accelerating the movement speed of the gas, ensuring that the air flow passes through the impeller 100 better, and improving the working efficiency of the impeller 100.

[0089] In some embodiments, the cross-section of the first plate portion 111 passing through the axis of the impeller 100 is in a straight line shape and is perpendicular to the axis of the impeller 100. Specifically, referring to Figures 1 and 2, the first plate portion 111 can provide stable support and positioning for the blades 130 to ensure that the blades 130 maintain the correct position and stability during operation. The straight line shape of the first plate portion 111 and its perpendicularity to the axis of the impeller 100 help the blades 130 obtain stable support during operation, and can also maintain a minimum gap between the blades 130 and the first plate portion 111 to reduce airflow leakage and loss. In addition, the straight line shape and vertical positioning can also ensure good symmetry between the blades 130 and the first plate portion 111, so as to further optimize the operational stability of the impeller 100.

[0090] In some embodiments, the inner edge of the end of blade 130 is connected to first plate portion 111, and the outer edge is connected to second plate portion 112. Specifically, referring to FIG1 , the end of blade 130 is connected to first end plate 110, wherein the inner edge of the end of blade 130 is connected to first plate portion 111, and the outer edge is connected to second plate portion 112. By connecting the inner edge of blade 130 to first plate portion 111, stable support and positioning are provided, ensuring safe and smooth operation of blade 130 in impeller 100. The outer edge of blade 130 is connected to second plate portion 112 to guide airflow out of impeller 100. In addition, this connection method can ensure a good seal between blade 130 and first and second plates 111, 112, reducing leakage and airflow loss.

[0091] 8 and 9, the impeller 100 according to the embodiment of the present application can be applied to a fan. The impeller 100 includes: a second end plate 120, a first end plate 110 and a plurality of blades 130. The second end plate 120 is provided with an air inlet 140. The air inlet 140 can guide the air flow into the impeller 100. The first end plate 110 and the second end plate 120 are spaced apart and arranged opposite to each other. The plurality of blades 130 are distributed along the circumference of the impeller 100. The blades 130 have a blade shape that is away from the axis of the impeller 100. The blade trailing edge 131, specifically, in the radial direction of the impeller 100, the side of the same blade 130 close to the axis of the impeller 100 is the blade leading edge 132, and the side away from the axis of the impeller 100 is the blade trailing edge 131. In other words, the blade trailing edge 131 is closer to the outer edges of the second end plate 120 and the first end plate 110 relative to the blade leading edge 132. The second end plate 120 and the first end plate 110 provide support for the blade 130, thereby improving the rigidity and strength of the blade 130.

[0092] The blade trailing edge 131 may include a third section 1311 , and the third section 1311 extends obliquely in a direction away from the second end plate 120 , and the oblique direction is opposite to the rotation direction of the impeller 100 during operation. Specifically, the impeller 100 of the embodiment of the present application can be applied to a centrifugal fan. When the impeller 100 rotates, the air flow entering from the air inlet 140 is accelerated and the flow direction is changed, so that the flow direction of the gas entering from the air inlet 140 is changed from axial to radial. The flow path of the gas diverges radially and flows out from the gaps between adjacent blades 130. It can be understood that flow separation will occur in the process of the gas flowing from the second end plate 120 to the first end plate 110, and the flow separation phenomenon will increase in the direction from the second end plate 120 to the first end plate 110. By setting the third section 1311 of the blade trailing edge 131 to extend obliquely in the direction away from the second end plate 120, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, the blade 130 corresponding to the third section 1311 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 130 corresponding to the third section 1311, improve the aerodynamic efficiency of the impeller 100, and thereby improve the air volume and efficiency of the fan. As shown in FIG. 8 , the impeller 100 can rotate in the direction of E1 → E2 during operation, and the third section 1311 extends obliquely in the direction of E2 → E1.

[0093] According to the impeller 100 of the fan in the embodiment of the present application, the third section 1311 of the trailing edge 131 of the blade extends obliquely in the direction away from the second end plate 120, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, so that the blade 130 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 130 when the impeller 100 is working, improve the aerodynamic efficiency of the impeller 100, and thereby improve the air volume and efficiency of the fan.

[0094] Among them, the third section 1311 can be the entire section from the blade trailing edge 131 in the extension direction from the second end plate 120 to the first end plate 110, that is, the blade trailing edge 131 as a whole is inclined and extends in the direction away from the second end plate 120, and the third section 1311 can also be one of the sections in the extension direction from the second end plate 120 to the first end plate 110. In other words, the blade trailing edge 131 can also include a second section, a third section, etc., wherein the third section 1311 can be located at different positions of the blade trailing edge 131, for example, it can be located at a position of the blade trailing edge 131 close to the second end plate 120, it can also be located at a position of the blade trailing edge 131 close to the first end plate 110, or it can be located in the middle position of the blade trailing edge 131 in the axial direction. The impeller 100 guides the airflow into the impeller 100 from the air inlet 140 of the second end plate 120. During the flow from the second end plate 120 to the first end plate 110, flow separation will occur. By setting the third section 1311 of the trailing edge 131 of the blade to extend obliquely in the direction away from the second end plate 120, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, the airflow separation on the surface of the blade 130 can be reduced, the aerodynamic efficiency of the impeller 100 can be improved, and the air volume and efficiency of the fan can be improved.

[0095] In addition, a plurality of blades 130 are arranged at intervals along the circumference of the impeller 100, and at least a portion of the blades 130 may be connected between the second end plate 120 and the first end plate 110. In other words, all of the blades 130 may be connected between the second end plate 120 and the first end plate 110, or a portion of the blades 130 may be connected between the second end plate 120 and the first end plate 110. Specifically, the second end plate 120 and the first end plate 110 may be arranged at intervals along the air intake direction of the impeller 100, and the plurality of blades 130 are distributed at intervals along the circumference of the impeller 100, and the blades 130 are connected to the second end plate 120 and the first end plate 110. The air inlet 140 on the second end plate 120 may guide the air into the impeller 100, and the first end plate 110 may provide support for the blades 130, thereby improving the rigidity and strength of the blades 130.

[0096] In some embodiments of the present application, the third section 1311 extends in a direction away from the second end plate 120 to the edge of the blade 130 at one end adjacent to the first end plate 110. Specifically, with reference to FIG9 , along the axial direction of the impeller 100, the blade 130 may have a first end 130a and a second end 130b opposite to each other, wherein the first end 130a is adjacent to or connected to the second end plate 120, and the second end 130b is adjacent to or connected to the first end plate 110. The third section 1311 extends in a direction away from the second end plate 120 to the second end 130b of the blade 130. In combination with the above, after the air flow enters the impeller 100 from the air inlet 140, the flow separation phenomenon will increase in the direction from the second end plate 120 to the first end plate 110. By extending the third section 1311 to the edge of one end of the blade 130, that is, the blade 130 has an inclined surface opposite to the rotation direction of the impeller 100, and extends obliquely to the second end 130b of the blade 130, the flow separation of the air flow on the surface of the blade 130 near the first end plate 110 can be effectively reduced, making the air flow smoother, improving the aerodynamic efficiency of the impeller 100, and thereby improving the air volume and working efficiency of the fan.

[0097] It can be understood that by providing the third section 1311 and extending it obliquely in the direction away from the second end plate 120, the blade 130 is constructed with an inclined profile, which can reduce the flow separation of the airflow in the flow direction from the second end plate 120 to the first end plate 110, wherein the third section 1311 extends in the direction away from the second end plate 120, and the starting point of the third section 1311 can be the first end 130a, of course, it can also be the starting point from the middle position of the blade trailing edge 131, and the present application does not limit the starting position of the third section 1311.

[0098] 11 , in some embodiments of the present application, the angle γ between the third section 1311 and the axis of the impeller 100 is greater than or equal to 10° and less than 90°. The impeller 100 axis is C, and the third section 1311 has a certain angle with the impeller axis C. This allows the blade 130 corresponding to the third section 1311 to have a suitably inclined profile, facilitating airflow guidance, reducing airflow separation on the surface of the blade 130, ensuring smooth airflow, and improving the aerodynamic efficiency of the blade 130.

[0099] Among them, the third segment 1311 can be a straight line segment, an arc segment, etc. When the third segment 1311 is a straight line segment, the angle γ between the third segment 1311 and the axis can be a fixed angle. When the third segment 1311 is an arc segment, the angle γ between the third segment 1311 and the axis can be the angle between the tangent of the third segment 1311 and the axis. That is to say, there are multiple angles γ between the third segment 1311 and the axis, and the multiple angles γ all meet the requirements of being greater than or equal to 10° and less than 90°.

[0100] Furthermore, the angle γ between the third section 1311 and the axis of the impeller 100 is greater than or equal to 40° and less than 72°, wherein the inclination angle of the third section 1311 is controlled within a reasonable range, and the angle between the third section 1311 and the axis of the impeller 100 is greater than or equal to 40°, which can effectively reduce the airflow separation on the surface of the blade 130, and the angle between the third section 1311 and the axis of the impeller 100 is less than 72°, thereby avoiding excessive deflection of the blade 130 resulting in poor mold opening and manufacturability, thereby facilitating the processing and forming of the blade 130 and improving manufacturability and structural stability.

[0101] In some embodiments of the present application, the third section 1311 may be configured as a straight line section, which can facilitate the processing and forming of the blade 130 , improve the manufacturability of the blade 130 , and reduce mold making costs.

[0102] In some embodiments of the present application, the third section 1311 is configured as an arc segment, and the corresponding blade 130 surface is also an arc surface, which can reduce the flow resistance of the airflow and improve the smoothness of the airflow.

[0103] In some embodiments of the present application, the third section 1311 is configured as an arc segment in a direction away from the second end plate 120, and the inclination angle of the tangent of the third section 1311 relative to the axis gradually increases. In other words, in a direction gradually approaching the first end plate 110, the inclination angle of the third section 1311 gradually increases, so as to further reduce the flow separation of the airflow in the process of flowing from the second end plate 120 to the first end plate 110, effectively reduce the flow separation at the position where the blade 130 is close to the first end plate 110, reduce the generation of vortices, make the airflow flow smoothly, and improve the aerodynamic efficiency of the blade 130.

[0104] In combination with Figures 10 and 11, in some embodiments of the present application, the blade trailing edge 131 also includes a fourth section 1312, and the fourth section 1312 is closer to the second end plate 120 than the third section 1311, and there is an angle α between the third section 1311 and the fourth section 1312, which facilitates the mold opening and manufacturing of the blade 130, and the surfaces of the blade 130 corresponding to the third section 1311 and the fourth section 1312 have different airflow separation phenomena. The third section 1311 and the fourth section 1312 are set at different inclination angles to improve the working efficiency of the impeller 100.

[0105] Among them, the fourth section 1312 is close to the second end plate 120 and extends in the direction away from the second end plate 120. The fourth section 1312 can have the same inclination direction as the third section 1311, or the fourth section 1312 can have an inclination direction opposite to that of the third section 1311, or the fourth section 1312 can be coplanar with the axis. In other words, the fourth section 1312 can be a non-inclined structure.

[0106] Furthermore, the fourth section 1312 extends obliquely in a direction away from the second end plate 120, and has the same inclination direction as the third section 1311. That is, the fourth section 1312 extends obliquely in a direction away from the second end plate 120, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, so that the blade 130 corresponding to the fourth section 1312 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 130 corresponding to the first section, improve the aerodynamic efficiency of the impeller 100, and thereby improve the air volume and efficiency of the fan.

[0107] Among them, the angle α between the fourth section 1312 and the impeller axis C may be smaller than the angle γ between the third section 1311 and the impeller axis C. In other words, the inclination angle of the fourth section 1312 is smaller than the inclination angle of the third section 1311. The inclination angle of the profile of the blade 130 corresponding to the third section 1311 is larger, and the inclination angle of the profile of the blade 130 corresponding to the fourth section 1312 is smaller. The cooperation between the third section 1311 and the fourth section 1312 can reduce the flow separation of the airflow near the first end plate 110, thereby improving the aerodynamic efficiency of the impeller 100.

[0108] In some embodiments of the present application, the included angle α between the third section 1311 and the fourth section 1312 satisfies 10°≤α≤60°. In some embodiments, 40°≤α≤52°. Setting the included angle between the third section 1311 and the fourth section 1312 within a reasonable range facilitates the processing and forming of the blade 130. The third section 1311 and the fourth section 1312 cooperate to reduce airflow separation on the surface of the blade 130 near the first end plate 110, thereby improving the aerodynamic efficiency of the impeller 100.

[0109] In some embodiments of the present application, the fourth segment 1312 is configured as a straight segment, which can facilitate the processing and forming of the blade 130, improve the manufacturability of the blade 130 and reduce the mold opening cost.

[0110] In some embodiments of the present application, the fourth section 1312 is configured as an arc segment, and the corresponding surface of the blade 130 is also an arc surface, which can reduce the resistance of the airflow and improve the smoothness of the airflow.

[0111] In some embodiments of the present application, fourth segment 1312 is configured as an arc segment, and the inclination angle of the tangent line of fourth segment 1312 relative to the axis gradually increases as it moves away from second end plate 120. In other words, the inclination angle of fourth segment 1312 gradually increases as it approaches first end plate 110, thereby effectively reducing flow separation during the flow from second end plate 120 to first end plate 110, reducing the generation of vortices, ensuring smooth airflow, and improving the aerodynamic efficiency of blade 130.

[0112] With reference to FIG11 , in some embodiments of the present application, an angle β is formed between the fourth segment 1312 and the impeller axis C, where 0°≤β≤50°. In some embodiments, 0°≤β≤20°. The inclination angle of the fourth segment 1312 is controlled within a reasonable range, thereby reducing airflow separation on the surface of the blade 130 corresponding to the third segment 1311 and preventing excessive deflection of the blade 130, which would result in poor mold opening and manufacturability. This facilitates the processing and forming of the blade 130 and improves the manufacturability and structural stability of the blade 130.

[0113] In combination with Figures 10 and 11, in some embodiments of the present application, there is a transition section 1313 between the third section 1311 and the fourth section 1312. By setting the transition section 1313, the third section 1311 can smoothly transition to the transition section 1313, or the fourth section 1312 can smoothly transition to the transition section 1313, or the third section 1311 and the fourth section 1312 can smoothly transition to the transition section 1313, which can improve the smoothness of the airflow and improve the aerodynamic efficiency of the impeller 100.

[0114] Specifically, the third section 1311 can be a straight section to facilitate mold manufacturing of the blade 130. By providing a transition section 1313 between the third section 1311 and the fourth section 1312, and by providing a smooth transition between the third section 1311 and the transition section 1313, the resistance of the airflow at the junction of the third section 1311 and the fourth section 1312 can be reduced, allowing the airflow to flow smoothly. The fourth section 1312 can be a straight section to facilitate mold manufacturing of the blade 130. By providing a transition section 1313 between the third section 1311 and the fourth section 1312, and by providing a smooth transition between the fourth section 1312 and the transition section 1313, the resistance of the airflow at the junction of the third section 1311 and the fourth section 1312 can be reduced, allowing the airflow to flow smoothly.

[0115] In some embodiments of the present application, the transition section 1313 is an arc-shaped section. By setting the transition section 1313 as an arc-shaped section, the airflow resistance on the surface of the blade 130 corresponding to the transition section 1313 can be reduced, making the airflow smoother and thereby improving the aerodynamic efficiency of the blade 130.

[0116] Among them, the trailing edge 131 of the blade is provided with a third section 1311, a transition section 1313 and a fourth section 1312 in sequence in the direction from the second end plate 120 to the first end plate 110, wherein the third section 1311, the transition section 1313 and the fourth section 1312 can be arranged in different forms. For example, the third section 1311 can be a straight section, the transition section 1313 can be an arc section, and the fourth section 1312 can be a straight section, which is convenient for mold manufacturing of the blade 130, reduces mold manufacturing costs, and improves the manufacturability of the blade 130. Among them, the transition section 1313 can be a tangent arc shape of the third section 1311 and the fourth section 1312. Through the cooperation of the third section 1311, the transition section 1313 and the fourth section 1312, the blade 130 can construct an inclined curved surface structure, guide the airflow, reduce the airflow separation on the surface of the blade 130, and improve the working efficiency of the impeller 100. Of course, the third segment 1311 can be an arcuate segment, the transition segment 1313 can be an arcuate segment, and the fourth segment 1312 can be a straight segment. For example, the third segment 1311, the fourth segment 1312, and the transition segment 1313 can all be arcuate segments. The third segment 1311, the arcuate segment, and the fourth segment 1312 of the present application can also be configured in other forms, which are not listed here. Based on the above description, those skilled in the art can easily obtain other configuration forms of the present application.

[0117] In some embodiments of the present application, the fourth section 1312 extends toward the second end plate 120 to an edge of the blade 130 at one end close to the second end plate 120. Specifically, with reference to FIG9 , along the axial direction of the impeller 100, the blade 130 may have a first end 130a and a second end 130b opposite to each other, wherein the first end 130a is close to the second end plate 120, and the second end 130b is close to the first end plate 110. The fourth section 1312 extends toward the second end plate 120 to the first end 130a of the blade 130.

[0118] With reference to Figure 10 , in some embodiments of the present application, in the axial direction, the height dimension of blade 130 is H1, and the height dimension of third section 1311 is H2, where 10% ≤ H2 / H1 ≤ 90%. In some embodiments, 15% ≤ H2 / H1 ≤ 60%. This ratio of third section 1311 in the axial direction is within a reasonable range, which can enhance the airflow separation improvement effect of blade 130 corresponding to third section 1311 and facilitate mold manufacturing of blade 130. For example, H2 / H1 can be 16%, 20%, 30%, 40%, 60%, etc.

[0119] In conjunction with Figure 11 , in some embodiments of the present application, along the axis of the impeller 100, the height dimension of the blade 130 is H1, and the height dimension of the fourth section 1312 is H3, where 10% ≤ H3 / H1 ≤ 75%. In some embodiments, 40% ≤ H3 / H1 ≤ 70%. The inclination angle of the fourth section 1312 relative to the third section 1311 is relatively small, and the proportion of the fourth section 1312 along the axis is within a reasonable range, which can facilitate the mold manufacturing and processing of the blade 130 and facilitate the reduction of airflow separation on the surface of the blade 130 through the third section 1311. For example, H2 / H1 can be 40%, 50%, 60%, 70%, etc.

[0120] In combination with Figures 12 and 13, in some embodiments of the present application, the first end plate 110 includes a second plate portion 112, and the second plate portion 112 extends in a radially outward direction along the impeller 100, in a direction away from the second end plate 120, and the blades 130 are connected to the second plate portion 112. Specifically, the airflow enters the impeller 100 from the air inlet 140 of the second end plate 120, and the second end plate 120 can guide the airflow into the impeller 100. The first end plate 110 can support the blades 130 and guide the airflow out of the impeller 100. By providing the second plate portion 112 and constructing the second plate portion 112 into an outward-expanding shape, the resistance of the airflow during the outward flow can be reduced, so that the airflow flows outward smoothly, thereby improving the working efficiency of the impeller 100.

[0121] Furthermore, the first end plate 110 also includes a first plate portion 111, a second plate portion 112 connected to the outer periphery of the first plate portion 111, and the second plate portion 112 is arranged around the first plate portion 111, wherein the first plate portion 111 can be configured to connect to the motor, and the second plate portion 112 can be configured to connect to the blade 130. The cooperation between the second plate portion 112 and the first plate portion 111 can enhance the structural strength of the first end plate 110, thereby effectively supporting the blade 130 and enhancing the structural stability of the impeller 100.

[0122] Another object of the present application is to provide a fan, which includes the impeller 100 described above.

[0123] According to the fan in the embodiment of the present application, the fan includes a motor and the impeller 100 described in any of the above embodiments, and the motor is disposed on the first end plate 110 of the impeller 100. Specifically, the fan includes the motor and the impeller 100, wherein the motor's rotating shaft is disposed on the first end plate 110 of the impeller 100. The first end plate 110 supports the motor's rotating shaft and transmits the motor's power to the impeller 100. The motor is directly connected to the impeller 100 through the first end plate 110, and the rotation of the motor's rotating shaft drives the blades 130 to rotate.

[0124] According to the fan in the embodiment of the present application, by applying the aforementioned impeller 100, the structure and shape of the first end plate 110 of the impeller 100 can be improved. Under the same airflow output, the impact and turbulence between the airflow and other components can be reduced, thereby improving the working efficiency of the impeller 100 and reducing the energy consumption and noise level of the fan.

[0125] The fan can be a centrifugal fan. By providing the aforementioned impeller 100, airflow separation on the surface of the blades 130 is reduced, and the impeller 100 has high aerodynamic efficiency, thereby increasing the air volume and operating efficiency of the fan. The fan of the embodiment of the present application can be used in equipment such as air conditioners to reduce equipment energy consumption.

[0126] This application also proposes an air handling unit 200, which includes the aforementioned impeller 100 or fan. Please refer to Figure 14, which is a schematic diagram of the structure of the impeller 100 of the aforementioned embodiment installed in the air handling unit 200. The air handling unit 200 heats or cools the airflow through the heat exchanger 210, and then delivers the airflow to the duct system through the impeller 100 or fan of the aforementioned embodiment. Assuming that the second plate portion 112 of the first end plate 110 of the impeller is a linear cross-section passing through the impeller axis as a comparative solution, compared with the impeller 100 described in the embodiment of this application, at the same air volume, the impeller 100 described in this application has an aerodynamic efficiency of 62.5%, while the impeller of the comparative solution has an aerodynamic efficiency of 61.2%.

[0127] According to the air handling unit 200 in the embodiment of the present application, by applying the aforementioned impeller 100 or fan, efficient air flow transmission can be achieved, good ventilation effect can be provided, indoor temperature can be adjusted, and noise level can be controlled.

[0128] In the description of this application, it should be understood that the terms "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0129] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0130] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0131] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0132] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0133] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An impeller comprising: A first end plate, a second end plate, and a plurality of blades spaced apart along the circumference of the impeller, the second end plate being provided with an air inlet, the second end plate and the first end plate being spaced apart along the air inlet direction of the impeller; the blades connecting the first end plate and the second end plate, the first end plate comprising a first plate portion and a second plate portion arranged around the periphery of the first plate portion, the second plate portion having a non-linear shape in a cross section passing through the axis of the impeller, and being inclined in a direction away from the axis of the impeller in a direction away from the second end plate.

2. The impeller according to claim 1, wherein: The cross section is divided into at least two sections in the radial direction, and the at least two sections include a first section close to the impeller axis and a second section away from the impeller axis. The angle a1 between the first section and the impeller axis is greater than the angle a2 between the second section and the impeller axis.

3. The impeller according to claim 2, wherein: The angle between at least one of the at least two sections and the impeller axis gradually decreases in the direction away from the impeller axis; or the angle between at least one of the at least two sections and the impeller axis remains unchanged in the direction away from the impeller axis.

4. The impeller according to claim 2 or 3, wherein: At least one of the at least two sections is in a straight line shape; or, at least one of the at least two sections is in a smooth arc shape, and departs from the first end plate in a direction away from the impeller axis, and the angle between the end plate and the impeller axis gradually decreases.

5. The impeller according to any one of claims 2 to 4, wherein: Two adjacent sections of the at least two sections transition smoothly; and the at least two sections transition smoothly with the first plate portion.

6. The impeller according to any one of claims 1 to 5, wherein: The included angle a between the cross section and the impeller axis gradually decreases; or, the cross section is in the shape of a smooth curve.

7. An impeller according to any one of claims 1 to 6, wherein: An included angle a between the second plate portion and the impeller axis is configured to be 30°≤a≤90°.

8. An impeller according to any one of claims 1 to 7, wherein: A radial span L of the second plate portion and an outer diameter D1 of the second end plate satisfy 10%≤L / D1≤25%.

9. The impeller according to claim 8, wherein: 14%≤L / D1≤18%.

10. An impeller according to any one of claims 1 to 9, wherein: The first end plate outer diameter D2 and the second end plate outer diameter D1 satisfy 50%≤D2 / D1≤100%.

11. The impeller according to claim 10, wherein: 60%≤D2 / D1≤70%.

12. An impeller according to any one of claims 1 to 11, wherein: The first plate portion is opposite to the air inlet along the impeller axis, and a projection of the air inlet on the first end plate along the impeller axis falls into the first end plate.

13. An impeller according to any one of claims 1 to 12, wherein: The cross section of the first plate portion passing through the impeller axis is in a straight line shape and is perpendicular to the impeller axis; or the inner edge of the blade end is connected to the first plate portion, and the outer edge is connected to the second plate portion.

14. The impeller according to any one of claims 1 to 13, wherein: The blade has a blade trailing edge facing away from the axis of the impeller, The trailing edge of the blade includes a third section, and the third section extends obliquely in a direction away from the second end plate, and the oblique direction is opposite to the rotation direction of the impeller when it is working.

15. The impeller according to claim 14, wherein: The third section extends in a direction away from the second end plate to an edge of an end of the blade close to the first end plate.

16. The impeller according to claim 14 or 15, wherein: An included angle γ between the third segment and the axis is greater than or equal to 10° and less than 90°.

17. The impeller according to any one of claims 14 to 16, wherein: The third segment is configured as a straight segment; or, the third segment is configured as an arc segment; or, in the direction away from the second end plate, the third segment is configured as an arc segment, and the inclination angle of the tangent of the third segment relative to the axis gradually increases.

18. The impeller according to any one of claims 14 to 17, wherein: The blade trailing edge further includes a fourth section. The fourth section is closer to the second end plate than the third section, and an angle α is formed between the third section and the fourth section.

19. The impeller according to claim 18, wherein The fourth section extends obliquely in a direction away from the second end plate, and has the same inclination direction as the third section.

20. The impeller according to claim 19, wherein An included angle α between the third segment and the fourth segment satisfies 10°≤α≤60. The impeller according to claim 20 , wherein 40°≤α≤52°.

22. The impeller according to any one of claims 19 to 21, wherein: The fourth segment is configured as a straight line segment; or, the fourth segment is configured as an arc segment; or, the fourth segment is configured as an arc segment, and the inclination angle of the tangent of the fourth segment relative to the axis gradually increases.

23. An impeller according to any one of claims 18 to 22, wherein: The fourth section extends obliquely in a direction away from the second end plate, and in an inclination direction opposite to that of the third section; or the fourth section is coplanar with the axis.

24. An impeller according to any one of claims 18 to 23, wherein An included angle β is formed between the fourth segment and the axis, wherein 0°≤β≤50°. The impeller according to claim 24 , wherein 0°≤β≤20°.

26. An impeller according to any one of claims 18 to 25, wherein There is a transition section between the third section and the fourth section, The third section and the transition section are in smooth transition, and / or the fourth section and the transition section are in smooth transition; and / or the transition section is an arc section.

27. An impeller according to any one of claims 18 to 26, wherein The fourth section extends toward the second end plate to an edge of an end of the blade close to the second end plate.

28. An impeller according to any one of claims 18 to 27, wherein In the axial direction, the height dimension of the blade is H1, and the height dimension of the fourth section is H3, wherein 10%≤H3 / H1≤75%.

29. The impeller according to claim 28, wherein 40%≤H3 / H1≤70%.

30. An impeller according to any one of claims 18 to 29, wherein In the axial direction, the height dimension of the blade is H1, and the height dimension of the third section is H2, wherein 10%≤H2 / H1≤90%. The impeller according to claim 30 , wherein 15%≤H2 / H1≤60%.

32. A fan, wherein: It comprises an impeller according to any one of claims 1 to 29 and a motor, wherein the motor is arranged on a first end plate of the impeller.

33. An air handling unit, wherein: Includes the impeller according to any one of claims 1 to 31, or includes the fan according to claim 32.

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