Cross-flow fan for air conditioner indoor unit

Abstract

The cross-flow fan comprises a flow guide frame assembly, the flow guide frame assembly comprises a fixed plate, a movable plate capable of sliding along the fixed plate is arranged at one end of the fixed plate, end covers are fixed to the tail end of the fixed plate and the tail end of the movable plate, bearings are arranged in the centers of the end covers, and a plurality of fixing lugs are arranged at the top ends of the end covers. According to the cross-flow fan, through the design of the telescopic flow guide frame and the fan blade assembly, the adaptability of the cross-flow fan is remarkably improved; the length of a traditional cross-flow fan is fixed, and the traditional cross-flow fan is difficult to adapt to air conditioner indoor units of different sizes, however, the length of the fan is flexibly adjusted through sliding fit of a fixed plate and a movable plate and axial movement of left, middle and right fan blade units in the design; due to the characteristic, the requirement for customizing various fans due to model difference is reduced, and the production and inventory cost is also reduced; and meanwhile, the stability and the uniformity of the airflow in the adjusting process are ensured through the structures of the arc-shaped flow guide frame and the modularized fan blades.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a cross-flow fan for an indoor unit of an air conditioner. Background Art

[0002] As a common air flow driving component in the indoor unit of an air conditioner, the cross-flow fan is widely used due to its simple structure, uniform air volume, and low noise. In the prior art, the cross-flow fan usually consists of a fixed guide frame and an inadjustable fan blade assembly. Its length and fan blade layout are fixed after manufacturing and cannot be adjusted according to the actual size or usage requirements of the indoor unit of the air conditioner. This design often requires customizing different specifications of fans when facing air conditioner equipment of different models or special installation environments, resulting in increased production costs and reduced versatility. In addition, most of the fan blades of the existing cross-flow fans are of an integral structure. If some fan blades are damaged during the installation and maintenance process, the whole needs to be replaced, increasing the maintenance difficulty and cost and limiting its flexibility in diverse application scenarios.

[0003] The main deficiencies in the prior art are that the length of the cross-flow fan is inadjustable, the adaptability is poor, and the maintenance cost is high, which directly affect its usage efficiency in a changing application environment. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose a cross-flow fan for an indoor unit of an air conditioner.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A cross-flow fan for an indoor unit of an air conditioner, comprising: a guide frame assembly, the guide frame assembly includes a fixed plate, one end of the fixed plate is provided with a movable plate that can slide along the fixed plate, end caps are fixed at the ends of the fixed plate and the movable plate, bearings are arranged at the central positions of the end caps, a plurality of fixed ears are arranged at the top ends of the end caps, and both the fixed plate and the movable plate are of an arc-shaped structure; a telescopic fan blade assembly rotatably arranged in the guide frame assembly, the telescopic fan blade assembly includes a left-end fan blade unit, a middle fan blade unit that can move axially along the left-end fan blade unit is arranged on one side of the left-end fan blade unit, there are multiple middle fan blade units, two adjacent middle fan blade units are movably connected to each other and can move axially along each other, a right-end fan blade unit that can move axially along the middle fan blade unit is arranged on one side of the middle fan blade unit at the end, drive shafts matching the bearings are arranged at the ends of the left-end fan blade unit and the right-end fan blade unit, and the bearings and the drive shafts cooperate with each other; a stepper motor fixed on one side of the end cap, and the power output shaft of the stepper motor is in transmission connection with the drive shaft.

[0007] Preferably, a flow guiding inner cavity is provided inside the fixed plate. One side of the flow guiding inner cavity is an open structure, and a first limiting portion is provided at one end of the movable plate inserted into the inside of the flow guiding inner cavity.

[0008] Preferably, the left end blade unit includes a left end plate. A left cylinder is fixed at the central position on one side of the left end plate. The end of the left cylinder extends inwards to form a left limiting ring, and a left limiting groove is provided on the left limiting ring. A plurality of left blades are arranged on the outer side wall of the left cylinder at equal distances according to the center of the left cylinder. A left-shaped inner cavity is provided inside the left blade, and one end of the left-shaped inner cavity is designed to be open.

[0009] Preferably, the middle blade unit includes a middle plate. A middle shaft matching the left cylinder is provided on one side of the middle plate. A middle limiting strip matching the left limiting groove is provided on the outer side wall of the middle shaft. A plurality of middle connecting blocks are arranged at equal distances on the outer wall of the middle shaft. The end of the middle connecting block is fixed with a middle first blade matching the left-shaped inner cavity, and a middle limiting portion of the left-shaped inner cavity is provided at the edge of the middle first blade.

[0010] Preferably, the middle blade unit further includes a middle cylinder provided on the other side of the middle plate. The middle cylinder matches the middle shaft. The end of the middle cylinder extends inwards to form a middle limiting ring, and a middle limiting groove matching the middle limiting strip is provided on the middle limiting ring. A plurality of middle second blades are arranged on the outer wall of the middle cylinder at equal distances according to the center of the middle cylinder. The middle cylinder matches the middle first blade, and a middle inner cavity matching the middle first blade is provided inside the middle second blade.

[0011] Preferably, the right end blade unit includes a right-shaped shaft fixedly provided at the center of one side. A right limiting strip matching the middle limiting groove is provided at the edge of the right-shaped shaft. A plurality of right connecting blocks are arranged at equal distances at the edge of the right-shaped shaft. The end of the right connecting block is fixed with a right end plate right blade matching the middle inner cavity, and a right limiting portion of the middle inner cavity is provided at the edge of the right end plate right blade.

[0012] The present invention has the following beneficial effects:

[0013] 1. Through the design of the telescopic flow guiding frame and the blade assembly, the adaptability of the cross-flow fan is significantly improved. The length of the traditional cross-flow fan is fixed and it is difficult to adapt to the inner machines of air conditioners with different sizes. However, with the sliding cooperation of the fixed plate and the movable plate in this design, as well as the axial movement of the left, middle, and right blade units, the flexible adjustment of the fan length is realized. This characteristic not only reduces the need to customize multiple fans due to model differences, but also reduces production and inventory costs. At the same time, the structure of the arc-shaped flow guiding frame and the modular blades ensures the stability and uniformity of the air flow during the adjustment process, enabling the fan to be widely used in various air conditioning equipment such as household and commercial ones, greatly enhancing its practicality and market competitiveness.

[0014] 2. Through the innovative design of modular fan blades, the present invention significantly reduces the maintenance difficulty and cost. Compared with traditional integral fan blades, the fan blade assembly of the present invention consists of multiple independent units, which are connected through the cooperation of a T-shaped shaft, a limiting groove, and an inner cavity. If a certain part of the fan blade is damaged, only the corresponding unit needs to be replaced instead of the entire fan, avoiding waste of resources. In addition, the limiting part and the guiding structure ensure the stability of each unit during telescoping and rotation, which is convenient for disassembly and assembly and also guarantees the reliability of long-term use. This design not only improves the maintenance efficiency but also extends the service life of the fan, providing a more economical solution for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a cross-flow fan;

[0016] Figure 2 It is a schematic diagram of the structure of a guide frame assembly;

[0017] Figure 3 It is a schematic cross-sectional view of the guide frame assembly;

[0018] Figure 4 It is for Figure 3 The enlarged schematic diagram of the partial structure at A in

[0019] Figure 5 It is a schematic diagram of the structure of a telescopic fan blade assembly;

[0020] Figure 6 It is a schematic diagram of the structure of the left-end fan blade unit;

[0021] Figure 7 It is for Figure 6 The enlarged schematic diagram of the partial structure at B in

[0022] Figure 8 It is one of the schematic diagrams of the structure of the middle fan blade unit;

[0023] Figure 9 It is another schematic diagram of the structure of the middle fan blade unit;

[0024] Figure 10 It is for Figure 9 The enlarged schematic diagram of the partial structure at C in

[0025] Figure 11 It is for Figure 9 The enlarged schematic diagram of the partial structure at D in

[0026] Figure 12 It is a schematic diagram of the structure of the right-end fan blade unit;

[0027] Figure 13 It is for Figure 12 The enlarged schematic diagram of the partial structure at E in

[0028] Figure 14 It is a schematic diagram of the structure of an existing cross-flow fan.

[0029] In the figure: 1. Flow guide frame assembly; 101. Fixed plate; 101a. Flow guide T-shaped inner cavity; 102. Movable plate; 102a. First limiting part; 103. End cover; 104. Bearing; 105. Fixed ear; 2. Telescopic fan blade assembly; 201. Left end fan blade unit; 201a. Left end plate; 201b. Left cylinder; 201c. Left limiting ring; 201d. Left limiting groove; 201e. Left fan blade; 201f. Left T-shaped inner cavity; 202. Middle fan blade unit; 202a. Middle plate; 202b. Middle T-shaped shaft; 202c. Middle limiting strip; 202d. Middle connecting block; 202e. First middle fan blade; 202f. Middle limiting part; 202g. Middle cylinder; 202h. Middle limiting ring; 202i. Middle limiting groove; 202j. Second middle fan blade; 202k. Middle T-shaped inner cavity; 203. Right end fan blade unit; 203e. Right end plate; 203b. Right T-shaped shaft; 203c. Right limiting strip; 203d. Right connecting block; 203e. Right fan blade; 203f. Right limiting part; 204. Transmission shaft; 3. Stepper motor. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] Refer to Figure 1-13, A cross-flow fan for an air conditioner indoor unit, comprising: a guide frame assembly 1, the guide frame assembly 1 includes a fixed plate 101, one end of the fixed plate 101 is provided with a movable plate 102 that can slide along the fixed plate 101, end caps 103 are fixed to the ends of both the fixed plate 101 and the movable plate 102, a bearing 104 is provided at the central position of the end cap 103, a plurality of fixing ears 105 are provided at the top of the end cap 103, and both the fixed plate 101 and the movable plate 102 are arc-shaped structures; a telescopic fan blade assembly 2 rotatably arranged in the guide frame assembly 1, the telescopic fan blade assembly 2 includes a left-end fan blade unit 201, a middle fan blade unit 202 that can move axially along the left-end fan blade unit 201 is provided on one side of the left-end fan blade unit 201, there are multiple middle fan blade units 202, adjacent two middle fan blade units 202 are movably connected to each other and can move axially along each other, a right-end fan blade unit 203 that can move axially along the middle fan blade unit 202 is provided on one side of the middle fan blade unit 202 at the end, drive shafts 204 matching the bearings 104 are provided at the ends of both the left-end fan blade unit 201 and the right-end fan blade unit 203, and the bearings 104 and the drive shafts 204 cooperate with each other; a stepping motor 3 fixed to one side of the end cap 103, and the power output shaft of the stepping motor 3 is drivingly connected to the drive shaft 204.

[0032] In this embodiment, the fixed plate 101 and the movable plate 102 in the guide frame assembly 1 adopt an arc-shaped design and are in sliding fit, so that the length of the fan can be flexibly adjusted according to requirements, while the fixing ears 105 and the bearings 104 on the end cap 103 ensure stable installation and smooth rotation of the fan blades; the telescopic fan blade assembly 2 is composed of a left-end fan blade unit 201, multiple middle fan blade units 202 that can move axially, and a right-end fan blade unit 203. Through the movable connection between them and the drive shafts 204 matching the bearings 104, while realizing the telescopic function, the rotation stability is ensured; the stepping motor 3 drives the drive shaft 204 through its power output shaft to precisely control the rotation speed of the fan blades and improve the air flow regulation efficiency; this design not only enhances the adaptability, but also optimizes the energy efficiency and the convenience of use.

[0033] In the present invention, a guide T-shaped inner cavity 101a is provided inside the fixed plate 101, one side of the guide T-shaped inner cavity 101a is an open structure, and a first limiting portion 102a is provided at one end of the movable plate 102 inserted into the guide T-shaped inner cavity 101a.

[0034] In this embodiment, the flow-guiding T-shaped inner cavity 101a provided inside the fixing plate 101 and the opening structure on one side thereof, in sliding cooperation with the movable plate 102, jointly achieve the guiding and stability for the length adjustment of the cross-flow fan; the flow-guiding T-shaped inner cavity 101a provides an accurate sliding track for the movable plate 102 to ensure that it does not deviate from the direction when moving along the fixing plate 101, and the first limiting portion 102a provided at the insertion end of the movable plate 102 plays a limiting role to prevent it from detaching from the flow-guiding T-shaped inner cavity 101a; this design not only enhances the structural stability but also ensures the smoothness of the telescopic process, thereby improving the adaptability and use reliability of the fan in different installation environments.

[0035] In the present invention, the left-end blade unit 201 includes a left-end plate 201a. At the central position on one side of the left-end plate 201a, a left cylinder 201b is fixed. At the end of the left cylinder 201b, a left limiting ring 201c extends inward, and a left limiting groove 201d is provided on the left limiting ring 201c. On the outer sidewall of the left cylinder 201b, a plurality of left blades 201e are arranged at equal distances according to the center of the left cylinder 201b. Inside the left blade 201e, a left T-shaped inner cavity 201f is provided, and one end of the left T-shaped inner cavity 201f is of an open design.

[0036] In this embodiment, the left-end blade unit 201 provides key support for the telescoping and air flow generation of the cross-flow fan through its refined structural design; the left-end plate 201a serves as the basis, and the left cylinder 201b fixed in the center provides guiding and limiting functions for the connection of subsequent blade units through the left limiting ring 201c and the left limiting groove 201d at the end; the left blades 201e arranged at equal distances on the outer sidewall of the left cylinder 201b are responsible for generating uniform air flow, and the left T-shaped inner cavity 201f and the open design inside each left blade 201e allow for sliding cooperation with the T-shaped shaft of adjacent units such as the middle blade unit to achieve the telescoping function; this structure not only ensures the stability and smooth telescoping of the blade assembly but also optimizes the air flow distribution effect and improves the overall performance of the fan.

[0037] In the present invention, the middle blade unit 202 includes a middle plate 202a. On one side of the middle plate 202a, a middle T-shaped shaft 202b matching the left cylinder 201b is provided. On the outer sidewall of the middle T-shaped shaft 202b, a middle limiting strip 202c matching the left limiting groove 201d is provided. On the outer wall of the middle T-shaped shaft 202b, a plurality of middle connection blocks 202d are arranged at equal distances. At the end of the middle connection block 202d, a middle first blade 202e matching the left T-shaped inner cavity 201f is fixed, and a middle limiting portion 202f of the left T-shaped inner cavity 201f is provided at the edge of the middle first blade 202e.

[0038] In this embodiment, the middle fan blade unit 202 realizes precise connection and telescopic function with the left end fan blade unit 201 through its unique structural design; the middle plate 202a, as the core component, has the middle T-shaped shaft 202b on one side matching the left cylinder 201b, and the external middle limiting strip 202c is embedded in the left limiting groove 201d to ensure the guiding and stability during sliding; the middle connecting blocks 202d arranged equidistantly on the outer wall of the middle T-shaped shaft 202b fix the middle first fan blade 202e, and the middle first fan blade 202e cooperates with the left T-shaped inner cavity 201f, and the middle limiting part 202f at its edge further limits the displacement to prevent detachment; this design not only ensures the coordination and air flow uniformity of the fan blade assembly during the telescopic process, but also improves the durability of the structure and the installation convenience.

[0039] In the present invention, the middle fan blade unit 202 further includes a middle cylinder 202g provided on the other side of the middle plate 202a. The middle cylinder 202g matches the middle T-shaped shaft 202b. The end of the middle cylinder 202g extends inward to be provided with a middle limiting ring 202h. The middle limiting ring 202h is provided with a middle limiting groove 202i matching the middle limiting strip 202c. The outer wall of the middle cylinder 202g is provided with a plurality of middle second fan blades 202j arranged equidistantly according to the center of the middle cylinder 202g. The middle cylinder 202g matches the middle first fan blade 202e, and the middle T-shaped inner cavity 202k matching the middle first fan blade 202e is arranged inside the middle second fan blade 202j.

[0040] In this embodiment, the middle fan blade unit 202 further enhances the connectivity and functionality of the telescopic fan blade assembly through the structure added on the other side of the middle plate 202a; the middle cylinder 202g matches the middle T-shaped shaft 202b, and the middle limiting ring 202h and the middle limiting groove 202i at its end cooperate with the middle limiting strip 202c to provide stable guiding and limitation for the sliding of adjacent units such as another middle unit or the right end unit; the middle second fan blades 202j arranged equidistantly on the outer wall of the middle cylinder 202g are responsible for generating air flow, and the middle T-shaped inner cavity 202k inside it matches the middle first fan blade 202e to support axial telescopic connection; this design ensures seamless connection and smooth operation among multiple fan blade units, optimizes the air flow distribution at the same time, and improves the overall efficiency and adaptability of the fan.

[0041] In the present invention, the right end fan blade unit 203 includes 203a. A right T-shaped shaft 203b is fixedly arranged at the center of one side of 203a. A right limiting strip 203c matching the middle limiting groove 202i is arranged at the edge of the right T-shaped shaft 203b. A plurality of right connecting blocks 203d are arranged equidistantly at the edge of the right T-shaped shaft 203b. The end of the right connecting block 203d is fixed with a right end plate right fan blade 203e matching the middle T-shaped inner cavity 202k. A right limiting part 203f matching the middle T-shaped inner cavity 202k is arranged at the edge of the right end plate right fan blade 203e.

[0042] In this embodiment, the right-end fan blade unit 203 completes the end connection of the telescopic fan blade assembly and optimizes the overall performance through its elaborately designed structure. The right-end plate 203a serves as the foundation. The right T-shaped shaft 203b fixed at its center is matched with the middle limiting groove 202i through the right limiting strip 203c at the edge to ensure the stable sliding connection with the middle fan blade unit 202. The right connecting blocks 203d arranged at equal distances on the edge of the right T-shaped shaft 203b fix the right fan blade 203e of the right-end plate. The right fan blade 203e cooperates with the middle T-shaped inner cavity 202k, and the right limiting part 203f at its edge further restricts the displacement to prevent detachment. This design not only ensures the coordination and air flow uniformity during the telescoping of the fan blade assembly, but also enhances the durability of the structure and the convenience of installation, providing a reliable guarantee for the efficient operation of the fan.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A cross-flow fan for an air conditioner indoor unit, characterized in that, Comprising: A flow guiding frame assembly (1), the flow guiding frame assembly (1) includes a fixed plate (101), one end of the fixed plate (101) is provided with a movable plate (102) that can slide along the fixed plate (101), end caps (103) are fixed to the ends of both the fixed plate (101) and the movable plate (102), a bearing (104) is provided at the central position of the end cap (103), several fixing ears (105) are provided at the top of the end cap (103), and both the fixed plate (101) and the movable plate (102) are arc-shaped structures; A telescopic fan blade assembly (2) rotatably arranged within the flow guiding frame assembly (1), the telescopic fan blade assembly (2) includes a left end fan blade unit (201), a middle fan blade unit (202) that can axially move along the left end fan blade unit (201) is provided on one side of the left end fan blade unit (201), there are multiple middle fan blade units (202), adjacent two of the middle fan blade units (202) are movably connected to each other and can axially move along each other, a right end fan blade unit (203) that can axially move along the middle fan blade unit (202) is provided on one side of the middle fan blade unit (202) at the end, drive shafts (204) that match the bearings (104) are provided at the ends of both the left end fan blade unit (201) and the right end fan blade unit (203), and the bearings (104) and the drive shafts (204) cooperate with each other; A stepper motor (3) fixed to one side of the end cap (103), and the power output shaft of the stepper motor (3) is in transmission connection with the drive shaft (204).

2. The cross-flow fan for an air conditioner indoor unit according to claim 1, wherein, A flow guiding T-shaped inner cavity (101a) is provided inside the fixed plate (101), one side of the flow guiding T-shaped inner cavity (101a) is an open structure, and a first limiting portion (102a) is provided at the end of the movable plate (102) inserted into the flow guiding T-shaped inner cavity (101a).

3. The cross-flow fan for an indoor unit of an air conditioner according to claim 1, wherein The left end fan blade unit (201) includes a left end plate (201a), a left cylinder (201b) is fixed at the central position on one side of the left end plate (201a), a left limiting ring (201c) extends inward from the end of the left cylinder (201b), a left limiting groove (201d) is provided on the left limiting ring (201c), several left fan blades (201e) are arranged on the outer side wall of the left cylinder (201b) at equal distances according to the center of the left cylinder (201b), a left T-shaped inner cavity (201f) is provided inside the left fan blade (201e), and one end of the left T-shaped inner cavity (201f) is an open design.

4. The cross-flow fan for an air conditioner indoor unit according to claim 1, wherein, The middle fan unit (202) includes a middle plate (202a). On one side of the middle plate (202a), a middle T-shaped shaft (202b) matching the left cylinder (201b) is provided. On the outer wall of the middle T-shaped shaft (202b), a middle limiting strip (202c) matching the left limiting groove (201d) is provided. A number of middle connecting blocks (202d) are equidistantly arranged on the outer wall of the middle T-shaped shaft (202b). At the end of the middle connecting block (202d), a middle first fan blade (202e) matching the left T-shaped inner cavity (201f) is fixed. At the edge of the middle first fan blade (202e), a middle limiting part (202f) of the left T-shaped inner cavity (201f) is provided.

5. The cross-flow fan for an indoor unit of an air conditioner according to claim 4, characterized in that, The middle fan unit (202) further includes a middle cylinder (202g) arranged on the other side of the middle plate (202a). The middle cylinder (202g) matches the middle T-shaped shaft (202b). At the end of the middle cylinder (202g), a middle limiting ring (202h) extends inwards. On the middle limiting ring (202h), a middle limiting groove (202i) matching the middle limiting strip (202c) is provided. A number of middle second fan blades (202j) are arranged on the outer wall of the middle cylinder (202g) at equal distances according to the center of the middle cylinder (202g). The middle cylinder (202g) matches the middle first fan blade (202e). Inside the middle second fan blade (202j), a middle T-shaped inner cavity (202k) matching the middle first fan blade (202e) is provided.

6. The cross-flow fan for an air conditioner indoor unit according to claim 1, wherein, The right end fan unit (203) includes (203a). At the center of one side of the (203a), a right T-shaped shaft (203b) is fixedly provided. At the edge of the right T-shaped shaft (203b), a right limiting strip (203c) matching the middle limiting groove (202i) is provided. A number of right connecting blocks (203d) are equidistantly arranged at the edge of the right T-shaped shaft (203b). At the end of the right connecting block (203d), a right end plate right fan blade (203e) matching the middle T-shaped inner cavity (202k) is fixed. At the edge of the right end plate right fan blade (203e), a right limiting part (203f) matching the middle T-shaped inner cavity (202k) is provided.

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