Fan, air conditioner with fan, and method for manufacturing fan

Abstract

A fan includes an inflow portion arranged to form a fan inflow port, a base forming a fan outflow port together with the inflow portion, and a blade. The blade extends from the base to the inflow portion and includes a first guide surface inclined toward a radially outer side more as it tends toward a direction from the inflow portion toward the base, and a second guide surface inclined toward a radially outer side more as it tends toward a direction from the base toward the inflow portion.

Description

Technical Field

[0001] This invention relates to an air conditioner, and to a fan for an air conditioner. Background Technology

[0002] Generally, fans, as devices that use rotational force to blow air, are used in refrigerators, air conditioners, vacuum cleaners, and so on. Such fans can be classified into axial fans and centrifugal fans, etc., according to their air intake and exhaust methods and their shapes.

[0003] In addition, various filters can be installed in air conditioners, and these filters impede the airflow of the air conditioner. Therefore, compared with other types of fans, centrifugal fans that generate high static pressure are used in air conditioners.

[0004] A centrifugal fan is a fan that forces axially flowing fluid radially by rotating blades. Typically, a centrifugal fan includes a base housing a fan motor, multiple blades spaced at predetermined intervals between the base and the inlet section, and an inlet section forming the flow inlet. The outlet of the centrifugal fan can be formed along the edge of the centrifugal fan between the base and the inlet section.

[0005] In a centrifugal fan with such a structure, as the fan motor is driven, air flows in through the inlet along the direction of rotation, and the incoming air is discharged through the outlet between multiple blades. Summary of the Invention

[0006] Technical issues

[0007] One aspect of the present invention provides a fan with improved performance, an air conditioner having a fan, and a method for manufacturing a fan.

[0008] Technical solution

[0009] A fan according to a concept of the present invention includes: an inlet portion configured or arranged to form a fan inlet; a base configured or arranged to form a fan outlet together with the inlet portion; and blades. The blades extend from the base to the inlet portion and include: a first guide surface inclined radially outwards towards the base; and a second guide surface inclined radially outwards towards the inlet portion.

[0010] The blade includes a first surface facing outward in a radial direction and a second surface facing inward in a radial direction, wherein the first guide surface and the second guide surface may be located on or arranged on the second surface.

[0011] The inflow portion may include a core guide located or arranged in a portion of the inflow portion that encounters the first surface of the blade, and located or arranged in a plane perpendicular to the axis of rotation.

[0012] The inflow section includes an end that is inclined relative to a direction parallel to the direction of rotation axis, so as to guide the air flowing in from the fan inlet to the fan outlet.

[0013] The blade may include a stepped portion formed at the boundary between the first guide surface and the second guide surface.

[0014] The stepped differential portion may include: a first stepped differential portion having a surface facing the first guide surface; and a second stepped differential portion having a surface facing the second guide surface.

[0015] The inlet, the base, and the blade are injection molded together as a single piece.

[0016] An air conditioner according to a concept of the present invention includes: a housing having a housing inlet; a heat exchanger located or arranged inside the housing; and a fan configured to allow air to flow into the interior of the housing and exhaust towards the exterior of the housing. The fan may include: an inlet portion for allowing air flowing towards the interior of the housing to flow in; a base on which a fan motor configured to rotate the fan is mounted; and blades. The blades may extend from the base to the inlet portion and may include: a first guide surface formed obliquely along a first direction; a second guide surface formed obliquely along a second direction different from the first direction; and a stepped portion formed at the boundary between the first guide surface and the second guide surface.

[0017] The blade may include a first surface facing radially outward and a second surface facing radially inward. The first guide surface, the second guide surface, and the stepped portion may be located on or arranged on the second surface.

[0018] Therefore, the inflow section may include: a core guide located or arranged in a portion of the inflow section that encounters the first surface of the blade, and equipped or arranged in a plane perpendicular to the rotation axis of the fan.

[0019] The fan can be configured to generate positive pressure on the first surface and negative pressure on the second surface when the fan rotates.

[0020] The inflow section includes an end that is inclined relative to a direction parallel to the rotation axis of the fan, so as to guide the air flowing in from the fan inlet to the fan outlet.

[0021] The housing includes an inflow guide, configured or arranged to guide air flowing in from the housing inlet to the fan, wherein the inflow guide is formed to correspond to the end of the inflow portion.

[0022] The stepped differential portion may include: a first stepped differential portion having a surface facing the first guide surface; and a second stepped differential portion having a surface facing the second guide surface.

[0023] The inlet, the base, and the blade can be injection molded as a single piece.

[0024] A method for manufacturing an air conditioner according to the present invention includes the following steps: injecting resin into a mold to injection mold a fan; separating a first inner core along a first direction parallel to the rotation axis of the fan; separating a second inner core along a direction close to the rotation axis of the fan; separating an inner mold along the first direction; separating a first outer core along a direction away from the rotation axis of the fan, moving the second outer core along a second direction opposite to the first direction, and separating it along a direction away from the rotation axis of the fan.

[0025] The step of separating the second outer core along the direction away from the rotation axis of the fan may include the following steps: guiding the second outer core by means of a first guide surface, the first guide surface being formed obliquely in the fan along the direction away from the rotation axis of the fan as it extends along the second direction.

[0026] The step of separating the internal mold along the first direction may include the following steps: guiding the internal mold by means of a second guide surface, the second guide surface being formed obliquely on the fan in a direction away from the fan's axis of rotation as it extends along the first direction.

[0027] The method of manufacturing the fan allows the second outer core to be separated from the fan through the fan's outlet.

[0028] The method for manufacturing the fan allows the internal mold to be separated from the fan through the fan's inlet.

[0029] Technical effect

[0030] According to the concept of the present invention, since the fan is formed as a single unit, compared to the case where each component is produced and manufactured separately, the number of parts that may lose energy can be reduced, thus improving performance.

[0031] According to the concept of the present invention, the inlet of the fan is formed along the direction of air flow, thus reducing energy loss caused by turbulence. Attached Figure Description

[0032] Figure 1 This is a diagram illustrating an air conditioner according to an embodiment of the present invention.

[0033] Figure 2 It is shown Figure 1 The diagram shows a side cross-section of the air conditioner.

[0034] Figure 3 It is shown Figure 2 The diagram shows a fan.

[0035] Figure 4 It shows the basis Figure 3 The diagram shows a cross-section of the BB line.

[0036] Figure 5 It is shown Figure 3 The diagram shows the lower part of the fan.

[0037] Figure 6 It is shown in magnification Figure 2 The diagram shown is for part A.

[0038] Figure 7 It shows the basis Figure 5 The diagram shows a cross-section of the FF line.

[0039] Figure 8 It shows the basis Figure 5 A cross-sectional view of the GG line shown.

[0040] Figure 9 It shows the basis Figure 4 A cross-sectional view of the CC line shown.

[0041] Figure 10 It shows the basis Figure 4 A cross-sectional view of the DD line shown.

[0042] Figure 11 It shows the basis Figure 4 A cross-sectional view of the EE line shown.

[0043] Figure 12 Is Figure 8 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan.

[0044] Figure 13 Is Figure 9 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan.

[0045] Figure 14 Is Figure 11 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan.

[0046] Figure 15 It is shown Figure 12 The diagram shows the inner core separated from the fan.

[0047] Figure 16 It is shown Figure 15 The diagram shows the internal mold separated from the fan.

[0048] Figure 17 Is Figure 7 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan.

[0049] Figure 18 It is shown Figure 17 The diagram shows the state after the first outer core has been separated and the second outer core has been separated.

[0050] Figure 19 It shows the basis Figure 18 The diagram shows a cross-section of the HH line. Detailed Implementation

[0051] The embodiments described in this specification and the configurations shown in the accompanying drawings are merely preferred examples of the disclosed invention. When applying for this application, there may be various modifications that can replace the embodiments and drawings in this specification.

[0052] Furthermore, the same reference numerals or symbols used in the various figures of this specification indicate parts or components that perform substantially the same function.

[0053] Furthermore, the terminology used in this specification is for illustrative purposes and is not intended to limit or restrict the disclosed invention. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this specification, terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification, and do not preclude the presence or additional possibilities of one or more other features or numbers, steps, operations, constituent elements, components, or combinations thereof.

[0054] Furthermore, terms such as "first" and "second," which include ordinal numbers, used in this specification can describe multiple constituent elements, but the constituent elements are not limited to these terms. These terms are only used to distinguish one constituent element from another structural element. For example, without departing from the scope of the invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element. The term "and / or" includes a combination of multiple related described items or any one of multiple related described items.

[0055] Furthermore, the terms "upper part" and "lower part" used in the following description are defined based on the accompanying drawings, and the shape and position of each component are not limited to these terms.

[0056] Furthermore, the fan described below is used as an example of an application to a ceiling-mounted air conditioner, but it can also be applied to other types of air conditioners such as floor-standing or wall-mounted air conditioners, as well as other household appliances such as refrigerators or vacuum cleaners.

[0057] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0058] Figure 1 This is a perspective view of an air conditioner according to an embodiment of the present invention. Figure 2 yes Figure 1 The image shows a side sectional view of the air conditioner.

[0059] Reference Figure 1 and Figure 2 According to an embodiment of the present invention, the air conditioner 1 can be installed in the ceiling C. At least a portion of the air conditioner 1 can be embedded in the ceiling C.

[0060] The air conditioner 1 may include a housing 10 having a housing inlet 20 and a housing outlet 21, a heat exchanger 30 disposed inside the housing 10, and a fan 100 for circulating air.

[0061] The housing 10 may have a rectangular box shape that opens to the lower side, so that the components of the air conditioner 1 can be housed inside the housing 10. The housing 10 may be composed of an upper housing 11 disposed inside the ceiling C and a lower housing 13 attached to the lower part of the upper housing 11.

[0062] An air inlet 20 can be formed in the center of the lower housing 13, and an air outlet 21 can be formed on the outer side of the edge of the air inlet 20. An inflow path P1 can be provided between the air inlet 20 and the fan 100 to allow air flowing in through the air inlet 20, and an outlet path P2 can be provided between the fan 100 and the air outlet 21 to allow air discharged by the fan 100.

[0063] The shell outlet 21 can be formed adjacent to each edge in a manner corresponding to the outer contour of the lower shell 13. For example, as Figure 1 As shown, four housing outlets 21 can be formed, each having a quadrilateral shape on each side of the lower housing 13. That is, two housing outlets 21 can be formed along the X-axis and two along the Y-axis. The four housing outlets 21 are arranged to exhaust air to all directions of the room respectively. With this structure, the air conditioner 1 can draw in air from the bottom, cool or heat it, and then exhaust it downwards again.

[0064] A grille 17 may be incorporated on the bottom surface of the lower housing 13 to filter dust from the air flowing in toward the housing inlet 20.

[0065] The housing 10 may include an inflow guide 19. The inflow guide 19 may be configured to direct air flowing in through the housing inlet 20 to the fan 100.

[0066] The heat exchanger 30 can be formed in the shape of a quadrilateral ring and can be arranged inside the housing 10 on the outer side of the fan 100. The heat exchanger 30 is not limited to the quadrilateral ring shape and can be equipped with various shapes such as circular, elliptical or polygonal.

[0067] The heat exchanger 30 is placed in the drain pan 16, where condensate generated in the heat exchanger 30 can be collected. The drain pan 16 can be shaped to correspond to the shape of the heat exchanger 30. That is, when the heat exchanger 30 is a quadrilateral ring, the drain pan 16 can also be a quadrilateral ring; when the heat exchanger 30 is circular, the drain pan 16 can also be circular.

[0068] The fan 100 may be arranged at approximately the center of the housing 10. The fan 100 may be located inside the heat exchanger 30. The fan 100 may be a centrifugal fan that draws in air axially and discharges air radially. The air conditioner 1 may be equipped with a fan motor 109 for driving the fan 100.

[0069] With this configuration, air conditioner 1 can draw in indoor air, cool it, and then discharge it into the room, or it can draw in indoor air, heat it, and then discharge it into the room.

[0070] Figure 3 It is shown Figure 2 The diagram shows a fan. Figure 4 It shows the basis Figure 3 The diagram shows a cross-section of the BB line. Figure 5 It is shown Figure 3 The diagram shows the lower part of the fan. Figure 6 It is shown in magnification Figure 2 The diagram shown is for part A. Figure 7 It shows the basis Figure 5 The diagram shows a cross-section of the FF line. Figure 8 It shows the basis Figure 5 A cross-sectional view of the GG line shown. Figure 9 It shows the basis Figure 4 A cross-sectional view of the CC line shown. Figure 10 It shows the basis Figure 4 A cross-sectional view of the DD line shown. Figure 11 It shows the basis Figure 4 A cross-sectional view of the EE line shown.

[0071] Reference Figures 3 to 5 The fan 100 may include an inlet portion 110, blades 120, and a base 130. The inlet portion 110, blades 120, and base 130 may be molded as a single unit. The fan 100 may also be injection molded as a single unit.

[0072] The inlet portion 110 can be generally circular. The inlet portion 110 can generally have a donut shape with a central opening. The inlet portion 110 can form a fan inlet 119. Air can flow into the interior of the fan 100 through the fan inlet 119. The inlet portion 110 has a shape that guides the air flowing in through the fan inlet 119 to be discharged through the fan outlet 139. The inlet portion 110 can have a shape that expands radially outwards towards the upper side.

[0073] Reference Figure 4 and Figure 6 The end 118 of the fan inlet 119 forming the inflow portion 110 can be formed to be inclined relative to the direction of rotation axis by a predetermined angle α. The end 118 of the inflow portion 110 can have a shape that converges more towards the radially inward as it moves downward. The end 118 of the inflow portion 110 can extend in the direction of air inflow and outflow. The end 118 of the inflow portion 110 is formed so that the air flowing in through the fan inlet 119 can move naturally toward the fan outlet 139.

[0074] The inflow guide 19 can be formed to correspond to the fan inlet 119 of the inflow section 110. The inflow guide 19 can be formed to be inclined relative to the rotation axis direction of the fan 100 by a predetermined angle b. The inflow guide 19 can have a shape that expands further outward in a radial direction as it approaches the direction of air inflow. The inflow guide 19 can be formed inclined in a direction substantially the same as the end 118 of the inflow section 110.

[0075] The inflow section 110 may include a core guide 116 for guiding the outer cores 243 and 244 during the separation of the outer cores 243 and 244 of the manufacturing apparatus during the manufacturing process of the fan 100 (see reference). Figure 12-19 The core guide 116 can be formed in a plane substantially perpendicular to the rotation axis of the fan 100. The core guide 116 can be formed substantially parallel to the base 130. The core guide 116 can be formed in a portion of the inlet 110 that meets the first surface 121 of the blade 120. When the first outer core 243 separates from the fan 100 and the second outer core 244 separates from the fan 100, the core guide 116 can guide the second outer core 244. The second outer core 244 can be easily separated from the fan 100 by means of the core guide 116.

[0076] Blades 120 may be located between the inlet 110 and the base 130. Blades 120 may extend from the base 130 to the inlet 110. Blades 120 may be spaced at predetermined intervals along the edge of the fan 100 and may be configured in multiples. Blades 120 may include a first surface 121 that forms a positive pressure as the fan 100 rotates and a second surface 122 that forms a negative pressure. The first surface 121 may be formed to face outward in a radial direction, and the second surface 122 may be formed to face inward in a radial direction. When the fan 100 is rotated by the fan motor 109, air may be drawn in by the negative pressure formed on the second surface 122 and air may be discharged by the positive pressure formed on the first surface 121.

[0077] The second surface 122 may include a first guide surface 122a that guides the separation of the outer cores 243, 244 during the manufacture of the fan 100, and a second guide surface 122b that guides the separation of the inner cores 241, 242 and the inner mold 220. The first guide surface 122a may be formed to be inclined in a different direction than the second guide surface 122b.

[0078] Reference Figure 7The first guide surface 122a can be formed in a direction corresponding to the separation of the outer cores 243 and 244. The first guide surface 122a can be formed such that the closer it is to the upper part of the blade or fan, or the more adjacent it is to the upper part of the blade or fan, the more it is inclined radially outward. The first guide surface 122a can be formed such that the closer it is to the base 130, or the more adjacent it is to the base 130, the more it is inclined radially outward.

[0079] Reference Figure 8 The second guide surface 122b can be formed in a direction corresponding to the separation of the inner cores 241, 242 from the inner mold 220. The second guide surface 122b can be formed to be inclined towards the radially outward side as it moves downward.

[0080] The blade 120 may include stepped portions 123 and 124, which are formed at the point where a first guide surface 122a and a second guide surface 122b, which are inclined in different directions, meet. The stepped portions 123 and 124 may be located at the boundary between the first guide surface 122a and the second guide surface 122b.

[0081] Refer to the diagram shown from the top. Figure 4 The cross section of the CC line shown Figure 9 A first stepped portion 123 may be formed on the upper part of the blade 120. The second guide surface 122b is inclined radially outward as it gets closer to the inflow portion 110. Since the first guide surface 122a is formed to be inclined radially outward as it approaches the upper part of the blade 120, the second guide surface 122b is relatively more prominent than the first guide surface 122a. Accordingly, the first stepped portion 123 is formed to have a surface facing the first guide surface 122a.

[0082] Refer to the diagram shown from the top. Figure 4 The cross-section of the DD line shown Figure 10 At approximately the center of the blade 120, the first guide surface 122a and the second guide surface 122b form approximately the same plane and meet.

[0083] Refer to the diagram shown from the top. Figure 4 The cross-section of the EE line shown Figure 11 A second stepped portion 124 may be formed at the lower part of the blade 120. Since the second guide surface 122b is formed to be inclined radially outward towards the lower part of the blade 120, the first guide surface 122a is relatively more prominent than the second guide surface 122b. Accordingly, the second stepped portion 124 is formed to have a surface facing the second guide surface 122b.

[0084] According to an embodiment of the present invention, the blade 120 includes a first guide surface 122a and a second guide surface 122b, which are formed at different inclinations towards the base 130 from approximately the central portion between the base 130 and the inlet portion 110. Therefore, compared to the cases where the blades are formed at different inclinations from the base 130 towards the inlet portion 110 or vice versa, the step difference can be reduced to half. Accordingly, the fan 100 with blades 120 according to an embodiment of the present invention has the effect of reducing resistance, noise, and / or vibration caused by airflow.

[0085] The base 130 may have a generally disc-shaped form. The base 130 may include a fan motor housing 134 located generally in the center. The fan motor housing 134 may be configured to house the fan motor 109. The fan motor housing 134 may extend along the rotation axis of the fan 100.

[0086] A fan outlet 139 may be formed between the inlet 110 and the base 130. The base 130 may form the fan outlet 139 together with the inlet 110. The fan outlet 139 may be formed along the edge of the fan 100.

[0087] Figure 12 Is Figure 8 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan. Figure 13 Is Figure 9 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan. Figure 14 Is Figure 11 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan. Figure 15 It is shown Figure 12 The diagram shows the inner core separated from the fan. Figure 16 It is shown Figure 15 The diagram shows the internal mold separated from the fan. Figure 17 Is Figure 7 The cross-section shown illustrates molding via a mold. Figure 3 The diagram shows the status of the fan. Figure 18 It is shown Figure 17 The diagram shows the state after the first outer core has been separated and the second outer core has been separated. Figure 19 It shows the basis Figure 18The diagram shows a cross-section of the HH line.

[0088] Reference Figures 12 to 19 The process of molding the fan 100 using molds 220, 241, 242, 243, and 244 will be described. However, for ease of explanation, the configuration for molding one blade 120 will be described, and although not shown, the configuration described below can be configured to correspond to each of the plurality of blades. The fan 100 can be injection molded by injecting resin into molds 220, 241, 242, 243, and 244.

[0089] Reference Figure 12 To form the interior of the fan 100, molds 220, 241, 242, 243, and 244 may include an inner mold 220 and inner cores 241 and 242. The inner mold 220 and the second inner core 242 may be configured as part of the second surface 122 of the forming blade 120.

[0090] The first inner core 241 may be configured to be slidable relative to the second inner core 242. The first outer core 243 may be configured to be slidable relative to the second outer core 244.

[0091] The first outer core 243 and the second outer core 244 can be combined to form the first surface 121 of the blade 120. The first outer core 243 can be located above the second outer core 244.

[0092] The inner mold 220 and the second inner core 242 can be combined to form the second surface 122 of the blade 120. The inner mold 220 and the second inner core 242 can be arranged in the vertical direction.

[0093] Reference Figure 13 and Figure 14 To form the second surface 122 of the blade 120, molds 220, 241, 242, 243, and 244 may include an inner mold 220, a second inner core 242, and outer cores 243 and 244. The outer cores 243 and 244 contact the first guide surface 122a of the blade 120. The inner mold 220 and the second inner core 242 contact the second guide surface 122b.

[0094] For example, refer to Figure 13 The inner mold 220 and the first outer core 243 can form the upper part of the blade 120. The inner mold 220 and the first outer core 243 can meet at a position corresponding to the first stepped portion 123 of the blade 120. Accordingly, the inner mold 220 and the first outer core 243 can be easily separated from the fan 100. The first outer core 243 is configured to form the first stepped portion 123.

[0095] Reference Figure 14 The second inner core 242 and the second outer core 244 can form the lower part of the blade 120. The second inner core 242 and the second outer core 244 can meet at the second step difference 124 of the blade 120. Accordingly, the second inner core 242 and the second outer core 244 can be easily separated from the fan 100. The second inner core 242 is configured to form the second step difference 124.

[0096] Reference Figure 15 As the first inner core 241 descends, the second inner core 242 moves toward the rotation axis of the fan 100. Accordingly, the second inner core 242 can be separated from the fan 100.

[0097] Reference Figure 16 As the second inner core 242 separates from the fan 100, the inner mold 220 can also separate from the fan 100. At this time, the second guide surface 122b of the blade 120 is formed to be inclined radially away from the axis of rotation of the fan 100 as it tends downward, so that the inner mold 220 can be easily separated downward from the fan 100.

[0098] Reference Figure 17 and Figure 19 After separating the inner mold 220 and the inner cores 241 and 242, the outer cores 243 and 244 can be separated from the fan 100.

[0099] Reference Figure 19 The first outer core 243 can be separated from the fan 100 in a direction substantially perpendicular to the rotation axis of the fan 100. For example, referring to... Figure 3 The first outer core 243 of the blade, indicated by reference numeral 120 in the forming drawing, can be separated from the fan 100 by means of the core guide 116. The first outer core 243 is separated from the fan 100 in a direction substantially perpendicular to the rotation axis of the fan 100, thereby the core guide 116 is formed as a plane substantially perpendicular to the rotation axis of the fan 100.

[0100] Reference Figure 18 and Figure 19 As the first outer core 243 separates from the fan 100, the second outer core 244 can also separate from the fan 100. For example, as the first outer core 243 separates from the fan 100, the second outer core 244 can move upward. The second outer core 244 can move upward while simultaneously separating from the inlet portion 110 of the fan 100. The second outer core 244, separated from the inlet portion 110 of the fan 100, can separate from the fan 100 in a direction substantially perpendicular to the rotation axis of the fan 100, similar to the first outer core 243.

[0101] At this time, since the first guide surface 122a of the blade 120 is formed to be inclined more and more radially away from the axis of rotation of the fan 100 as it moves upward, the second outer core 244 can easily separate upward toward the inflow portion 110 of the fan 100.

[0102] The above description and illustrations have provided specific embodiments. However, the present invention is not limited to the embodiments described above. Anyone skilled in the art can make various modifications without departing from the spirit of the technical concept of the present invention as described in the claims.

Claims

1. A fan, comprising: The inflow section is arranged to form a fan inlet; The base is arranged to form a fan outlet together with the inflow section; as well as The blade, extending from the base to the inlet, includes: a first guide surface that is inclined radially outward in a direction from the inlet towards the base; and a second guide surface that is inclined radially outward in a direction from the base towards the inlet. The blade includes: The first surface faces outward in a radial direction; A second surface, facing radially inward, and the first guide surface and the second guide surface are disposed on the second surface; and A stepped difference is formed at the boundary between the first guide surface and the second guide surface. The stepped difference includes: The first stepped portion has a surface facing the first guide surface; and The second step difference portion has a surface facing the second guide surface.

2. The fan according to claim 1, wherein, The inflow portion includes a core guide disposed on a portion of the inflow portion that encounters the first surface of the blade and is disposed in a plane perpendicular to the axis of rotation.

3. The fan according to claim 1, wherein, The inflow section includes an end that is inclined relative to a direction parallel to the direction of rotation axis, so as to guide the air flowing in from the fan inlet to the fan outlet.

4. The fan according to claim 1, wherein, The inlet, the base, and the blade are injection molded as a single component.

5. An air conditioner, comprising: The casing has a casing inlet; A heat exchanger is arranged inside the housing; as well as A fan, equipped to allow air to flow into the interior of the housing and exhaust towards the exterior of the housing. The fan is the fan according to any one of claims 1 to 4.

6. The air conditioner according to claim 5, wherein, The fan is configured such that when the fan rotates, a positive pressure is formed on the first surface and a negative pressure is formed on the second surface.

7. A method for manufacturing a fan, the method being used to manufacture the fan according to any one of claims 1 to 4, wherein, Includes the following steps: A fan is injection molded by injecting resin into a mold. Separate the first inner core along a first direction parallel to the rotation axis of the fan; Separate the second inner core along the direction close to the rotation axis of the fan; Separate the internal mold along the first direction; Separate the first outer core along a direction away from the rotation axis of the fan. The second outer core is moved in a second direction opposite to the first direction and separated in a direction away from the rotation axis of the fan.

8. The method for manufacturing a fan according to claim 7, wherein, The step of separating the second outer core along the direction away from the rotation axis of the fan includes the following steps: guiding the second outer core by means of a first guide surface, the first guide surface being formed obliquely in the fan along the direction away from the rotation axis of the fan as it extends along the second direction.

9. The method for manufacturing a fan according to claim 7, wherein, The step of separating the internal mold along the first direction includes the following steps: guiding the internal mold by means of a second guide surface, the second guide surface being formed obliquely on the fan in a direction away from the fan's axis of rotation as it extends along the first direction.

10. The method for manufacturing a fan according to claim 7, wherein, The first outer core and the second outer core are separated from the fan through the fan's outlet.

11. The method of manufacturing a fan according to claim 7, wherein, The internal mold is separated from the fan by passing through the fan's inlet.

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