Overlapped axial flow fan

Abstract

The utility model relates to the technical field of ventilation, in particular to an overlapped axial flow fan which comprises a hub and first blades, the multiple sets of first blades are arranged on the hub at equal intervals, multiple sets of second blades are arranged on the periphery of the hub, connecting assemblies are detachably arranged between the second blades and the first blades, and multiple sets of guide rails are arranged on the hub. According to the fan, the number of the blades on the hub is adjusted, and the conveying air volume of the fan can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation, in particular to an overlapping axial flow fan. Background Art

[0002] A Chinese patent with the announcement number CN114635862A discloses an overlapping axial flow fan, including an air guide ring, an impeller hub and blades, the root of the blade is connected to the impeller hub, and the blades are arranged at intervals along the circumference of the impeller hub, the air guide ring is set outside the blade, and there is a gap between the blade tip and the air guide ring, and the chord length of the blade increases first and then decreases from the root to the tip of the blade in the radial direction, and there is an overlapping part between two adjacent blades in the projection along the axial direction. The beneficial effects achieved by the present invention are: the working capacity of the impeller is increased while the outer dimensions remain unchanged, the flow rate and pressure are guaranteed, and the installation angle of the blade and the blade tip chord length are reduced under the premise of ensuring the working capacity of the impeller, so as to achieve the effect of improving the efficiency of the fan and reducing the noise. However, in this patent, the number of blades remains constant, and when the air volume needs to be increased, the speed can only be increased, and the increase in speed is likely to lead to an increase in noise.

[0003] Based on this, the utility model designs an overlapping axial flow fan to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an overlapping axial flow fan to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an overlapping axial flow fan, comprising a hub and first blades, multiple groups of the first blades are equidistantly arranged on the hub, multiple groups of second blades are arranged on the outer periphery of the hub, a detachable connecting component is arranged between the second blades and the first blades, multiple groups of guide rails are arranged on the hub, multiple groups of the second blades are respectively slidably matched with the multiple groups of the guide rails, and a fixing component is arranged between the second blades and the hub.

[0006] Preferably, the fixing assembly comprises a slot and an insertion rod, and the slot and the insertion rod are engaged and matched with each other for positioning the second blade.

[0007] Preferably, a rotating block is provided in the wheel hub, the rotating block rotates coaxially with the wheel hub, a plurality of groups of the second blades pass through the guide rail and are connected to the rotating block, and the insertion rod is provided on the rotating block.

[0008] Preferably, the connecting assembly includes a U-shaped clamping plate and a slot, two groups of the slots are arranged opposite to each other at one end of the first blade and the second blade away from the hub, and the U-shaped clamping plate and the slots are engaged and matched with each other.

[0009] Preferably, a sliding groove is provided on the inner wall of the slot, and the U-shaped clamping plate and the sliding groove are slidably engaged with each other.

[0010] Preferably, an abutment plate is slidably provided in the slot, and a first elastic member is provided between the abutment plate and the slot.

[0011] Compared with the prior art, the utility model has the beneficial effect that the utility model is conducive to increasing the air volume delivered by the fan by adjusting the number of blades on the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the utility model embodiments, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a cross-sectional view of the overall structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the connection component of the utility model.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1-wheel hub, 11-first blade, 12-second blade, 13-guide rail, 2-connecting assembly, 21-U-shaped clamping plate, 22-slot, 23-slide groove, 24-abutment plate, 25-first elastic member, 3-fixing assembly, 31-slot, 32-insertion rod, 4-rotating block. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Combination Figure 1-3 :

[0020] A overlapping axial flow fan comprises a hub 1 and first blades 11, wherein a plurality of groups of first blades 11 are equidistantly arranged on the hub 1, a plurality of groups of second blades 12 are arranged on the outer periphery of the hub 1, a connecting assembly 2 is detachably arranged between the second blades 12 and the first blades 11, a plurality of groups of guide rails 13 are arranged on the hub 1, the plurality of groups of second blades 12 are respectively slidably matched with the plurality of groups of guide rails 13, and a fixing assembly 3 is arranged between the second blades 12 and the hub 1.

[0021] Furthermore, the fixing assembly 3 includes a slot 31 and an insert rod 32 , and the slot 31 and the insert rod 32 are engaged with each other and matched to position the second blade 12 .

[0022] Furthermore, a rotating block 4 is provided in the hub 1 , and the rotating block 4 rotates coaxially with the hub 1 . A plurality of groups of second blades 12 are connected to the rotating block 4 through the guide rail 13 , and the insertion rod 32 is provided on the rotating block 4 .

[0023] Furthermore, the connecting assembly 2 includes a U-shaped clamping plate 21 and a clamping groove 22. The two sets of clamping grooves 22 are oppositely arranged at the end of the first blade 11 and the second blade 12 away from the hub 1. The U-shaped clamping plate 21 and the clamping groove 22 are clamped and matched with each other.

[0024] Furthermore, a sliding groove 23 is provided on the inner wall of the clamping groove 22 , and the U-shaped clamping plate 21 and the sliding groove 23 are slidably engaged with each other.

[0025] Furthermore, an abutment plate 24 is slidably disposed in the slot 22 , and a first elastic member 25 is disposed between the abutment plate 24 and the slot 22 .

[0026] Specific application examples of the utility model:

[0027] The first blade 11 is fixedly arranged on the hub 1 as the main blade, and the second blade 12 is detachably connected and fixed to the first blade 11. When the second blade 12 is not in use, the second blade 12 and the first blade 11 are attached to each other to form a group of blades. When the air volume needs to be increased, the second blade 12 is separated from the first blade 11, and the second blade 12 moves to the middle of the two adjacent groups of first blades 11, so that the number of blades on the hub 1 is doubled, which is conducive to increasing the air volume. A guide rail 13 for the movement of the second blade 12 is provided on the hub 1. The end wall of the guide rail 13 abuts against the second blade 12 to ensure that the second blade 12 moves to the middle of the adjacent first blade 11. A rotating block 4 is coaxially rotated in the hub 1, and multiple groups of second blades 12 are connected to the rotating block 4 through the guide rail 13. The rotating block 4 is used to simultaneously drive multiple groups of second blades 12 to rotate and separate from the first blade 11, so as to facilitate the control of the position of the second blade 12. The rotating block 4 is provided with an insert rod 32 which is engaged and matched with a slot 31 provided on the hub 1 , which is beneficial for fixing the second blade 12 when the second blade 12 moves to the middle of two adjacent groups of first blades 11 .

[0028] The connecting assembly 2 is arranged at one end of the first blade 11 and the second blade 12 away from the hub 1, which is conducive to ensuring that the second blade 12 and the first blade 11 fit each other. Two groups of slots 22 are respectively arranged at the relative positions of the first blade 11 and the second blade 12. The two ends of the U-shaped clamping plate 21 span the first blade 11 and the second blade 12 and are respectively engaged and matched with the two groups of slots 22, and the U-shaped clamping plate 21 is used to ensure that the blades fit each other. The U-shaped clamping plate 21 also slides and matches with the slide groove 23 arranged on the inner wall of the slot 22, which is conducive to ensuring that the U-shaped clamping plate 21 can be horizontally inserted into the slot 22, so as to facilitate firm fixation. The abutment plate 24 is slidably arranged in the slot 22. A first elastic member 25 is arranged between the abutment plate 24 and the inner wall of the slot 22. The first elastic member 25 can be made of a spring. The first elastic member 25 drives the abutment plate 24 to move toward the notch of the slot 22. When the first blade 11 and the second blade 12 are separated from each other, the abutment plate 24 covers the notch of the slot 22 to ensure that the surface of the blade is flat. It is conducive to wind guidance.

[0029] In the description of the utility model, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In the utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0031] Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An overlapping axial flow fan, comprising a hub (1) and a first blade (11), characterized in that: A plurality of groups of the first blades (11) are equidistantly arranged on the hub (1); a plurality of groups of second blades (12) are arranged on the outer circumference of the hub (1); a detachable connecting assembly (2) is arranged between the second blades (12) and the first blades (11); a plurality of groups of guide rails (13) are arranged on the hub (1); the plurality of groups of the second blades (12) are respectively slidably matched with the plurality of groups of the guide rails (13); and a fixing assembly (3) is arranged between the second blades (12) and the hub (1).

2. The overlapping axial flow fan according to claim 1, characterized in that: The fixing assembly (3) comprises a slot (31) and an insertion rod (32); the slot (31) and the insertion rod (32) are mutually engaged and matched, and are used for positioning the second blade (12).

3. The overlapping axial flow fan according to claim 2, characterized in that: A rotating block (4) is provided in the wheel hub (1), the rotating block (4) rotates coaxially with the wheel hub (1), a plurality of groups of the second blades (12) pass through the guide rail (13) and are connected to the rotating block (4), and the insertion rod (32) is provided on the rotating block (4).

4. The overlapping axial flow fan according to claim 1, characterized in that: The connection assembly (2) comprises a U-shaped clamping plate (21) and a clamping groove (22), wherein two groups of the clamping grooves (22) are arranged opposite to each other at one end of the first blade (11) and the second blade (12) away from the hub (1), and the U-shaped clamping plate (21) and the clamping grooves (22) are clamped and matched with each other.

5. The overlapping axial flow fan according to claim 4, characterized in that: A sliding groove (23) is provided on the inner wall of the clamping groove (22), and the U-shaped clamping plate (21) and the sliding groove (23) are slidably engaged with each other.

6. The overlapping axial flow fan according to claim 4, characterized in that: An abutment plate (24) is slidably disposed in the clamping slot (22), and a first elastic member (25) is disposed between the abutment plate (24) and the clamping slot (22).

Images