Nozzle air supply device capable of adjusting air supply area

Abstract

The utility model belongs to the technical field of air supply devices, and particularly relates to a nozzle air supply device capable of adjusting air supply area, which comprises a nozzle, and an air supply outlet of the nozzle is provided with an air outlet area adjusting mechanism. The air outlet area adjusting mechanism comprises a base plate, a support, a fan blade combination located between the base plate and the support and a transmission structure used for driving the fan blade combination to be relatively closed or opened, the fan blade combination comprises a plurality of fan blades distributed in an annular array with the center of the support as the circle center, and the fan blades are of a polygonal blade structure. And when the fan blade combination is in a completely closed state, all the fan blades are spliced into a 360-degree whole to seal the air supply outlet. The transmission structure is additionally arranged to control the fan blades to be matched, the fan blades are driven to be closed or opened through rotation of the support, adjustment of the air supply area is achieved, and therefore even if the operation frequency of the air conditioner is reduced, the air supply speed of the nozzle is basically not changed due to the fact that the air supply area becomes small, and the air supply efficiency is improved. The air supply coverage range can be guaranteed, and energy saving can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air supply devices, in particular to a nozzle air supply device capable of adjusting the air supply area. Background Art

[0002] High-speed railway stations, terminals and other buildings are huge, with frequent personnel flow, periodicity in time and uneven distribution in space. Therefore, the load of air conditioning changes significantly. How the air conditioning system can adapt to this change and operate more efficiently is an urgent problem that needs to be solved.

[0003] The commonly used air supply form of air conditioner nozzles cannot meet this requirement: when the air conditioning load changes, the air supply device reduces the fan operating frequency, the air supply speed decreases, and the air outlet speed of the nozzle also decreases, which causes the range of the air supply device to decrease and cannot achieve the original designed air supply coverage. In this way, people in some areas may feel too cold or too hot. Although reducing the air conditioner operating frequency can save energy, it sacrifices the comfort of people and the air conditioning effect is discounted, which is not worth the loss. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nozzle air supply device which can adjust the air supply area and can ensure the air supply coverage and realize energy saving.

[0005] The technical solution adopted by the utility model to solve this problem is:

[0006] A nozzle air supply device for adjusting the air supply area comprises a nozzle, wherein the air supply port of the nozzle is provided with an air outlet area adjustment mechanism, the air outlet area adjustment mechanism comprises a chassis, a bracket, a fan blade combination located therebetween, and a transmission structure for driving the fan blade combination to be relatively closed or opened, the fan blade combination comprises a plurality of fan blades distributed in a circular array with the center of the bracket as the center of the circle, the fan blades are polygonal blade structures, and when the fan blade combination is in a fully closed state, all the fan blades form a 360° overall closed air outlet.

[0007] In one technical solution, the nozzle, chassis, fan blades and bracket are arranged in sequence, the chassis is concentrically arranged and fixedly connected to the nozzle, the bracket is concentrically arranged and rotatably connected to the chassis, and the bracket can be driven by a motor or other similar driving member to rotate with its center as the center of a circle.

[0008] In one technical solution, the nozzle is cylindrical, the chassis and the bracket are both circular, the diameter of the bracket is larger than the diameter of the chassis, and the nozzle, chassis and bracket are concentrically arranged.

[0009] In one technical solution, the bracket, chassis and nozzle have a first through hole, a second through hole and a third through hole in the middle respectively for allowing air to pass through, the first through hole, the second through hole and the third through hole together constitute an air supply path for allowing air to pass through, the first through hole, the second through hole and the third through hole are all circular holes, and the diameters of the first through hole, the second through hole and the third through hole are the same.

[0010] In one technical solution, the transmission structure includes:

[0011] A transmission groove is provided on a side of the chassis facing the bracket and is located outside the second through hole, the transmission groove is in the shape of a regular polygon, the number of sides of the transmission groove is consistent with the number of the fan blades (3), and the transmission groove is concentrically arranged with the second through hole;

[0012] Transmission holes, the number of which is the same as the number of the fan blades, the transmission holes are opened on the bracket and located outside the first through hole, the transmission holes are arranged obliquely, and the inclination directions of the transmission holes are consistent;

[0013] The transmission pin shaft is slidably arranged in the transmission hole in a one-to-one manner. One end of the transmission pin shaft is placed in the transmission groove. The other end of the transmission pin shaft passes through the fan blade and then extends out of the transmission hole. After passing through the bracket, the transmission pin shaft is fixed by a locking pin, and the locking pin is used to relatively fix and limit one side of the transmission pin shaft.

[0014] In one technical solution, the transmission hole is tilted in a counterclockwise direction from the side of the transmission hole close to the first through hole, and all the transmission holes together constitute an inclined guide structure arranged in a circular array with the center of the bracket as the center. The rotation of the bracket drives each transmission pin to move in the transmission slot and the transmission hole, so as to achieve the relative closing or opening of each fan blade, and the transmission slot and the transmission hole are used to plan and limit the path of the transmission pin, and then with the special shape and number of fan blades, each fan blade can move simultaneously under the rotation of the bracket to achieve the adjustment of the air outlet area.

[0015] In one technical solution, a connecting hole for allowing the transmission pin to pass through is provided on the fan blade.

[0016] In one technical solution, the fan blade is in a pentagonal shape, and the five sides of the fan blade are defined as a first edge, a second edge, a third edge, a fourth edge and a fifth edge, wherein:

[0017] The included angle between the first edge and the second edge is an obtuse angle;

[0018] The included angle between the second edge and the third edge is a right angle;

[0019] The angle between the third edge and the fourth edge is an acute angle, and the sum of the angles between the third edge and the fourth edge in all the fan blades is 360°;

[0020] The included angle between the fourth edge and the fifth edge is an obtuse angle;

[0021] The angle between the fifth edge and the first edge is an acute angle, and the connecting hole is located at the angle between the fifth edge and the first edge;

[0022] When two adjacent fan blades are matched, the third edge of one of the fan blades fits with the fourth edge of the other fan blade.

[0023] In one technical solution, the lengths of the third edge and the fourth edge are both greater than the diameter of the first through hole.

[0024] In one technical solution, there are six fan blades distributed in a circular array between the chassis and the bracket, and each fan blade is driven by a transmission structure to close or open, thereby achieving closing or opening of the path or adjustment of the opening amplitude.

[0025] In one technical solution, a restraint assembly is further provided between the bracket and the chassis.

[0026] In one technical solution, the constraint assembly includes constraint bolts respectively placed in each transmission hole, the head of the constraint bolt fits against the side wall of the chassis, and the other end of the constraint bolt passes through the transmission hole and is threadedly connected to a nut. The design of the constraint assembly performs an auxiliary constraint on the relative position between the bracket and the chassis through the cooperation of the constraint bolt to prevent the bracket and the chassis from being separated; and no fixed structure is used between the constraint bolt and the bracket and the chassis, so that the constraint bolt can have a certain movement function in the transmission hole, and the movement of the constraint bolt is used to reduce the friction generated when the bracket rotates, avoid the bracket from getting stuck, and make the bracket rotate more flexible.

[0027] The advantages and positive effects of the utility model are:

[0028] 1. The nozzle air supply device in the utility model controls the coordination of the fan blades by adding a transmission structure, and drives the fan blades to close or open each other through the rotation of the bracket, thereby realizing the adjustment of the air supply area. In this way, even if the operating frequency of the air conditioner is reduced, the air supply speed of the nozzle will not change basically due to the reduction of the air supply area, which can ensure the air supply coverage and achieve energy saving.

[0029] 2. In the utility model, the restraining bolts are used to assist in restraining the relative position between the bracket and the chassis to prevent the two from separating; and no fixed structure is used between the restraining bolts, the bracket and the chassis, so that the restraining bolts can have a certain movement function, and the movement of the restraining bolts is used to reduce the friction generated when the bracket rotates, avoiding jamming and making the rotation of the bracket more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for the purpose of explanation and are not intended to limit the scope of the utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0031] Figure 1 It is a side view of the nozzle air supply device for adjusting the air supply area of ​​the utility model;

[0032] Figure 2 It is a front view of the nozzle air supply device for adjusting the air supply area of ​​the utility model;

[0033] Figure 3 It is a front view of the nozzle air supply device of the utility model with a full air supply area;

[0034] Figure 4 for Figure 2 A magnified schematic diagram of part A;

[0035] Figure 5 It is a schematic diagram of the chassis in the utility model;

[0036] Figure 6 It is a schematic diagram of the bracket in the utility model;

[0037] Figure 7 It is a schematic diagram of the fan blade in the utility model.

[0038] In the figure: 1-nozzle; 2-chassis; 21-second through hole; 22-transmission slot; 3-blade; 31-first edge; 32-second edge; 33-third edge; 34-fourth edge; 35-fifth edge; 36-connecting hole; 4-bracket; 41-first through hole; 42-transmission hole; 5-transmission pin; 6-locking pin; 7-restraint bolt. DETAILED DESCRIPTION

[0039] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked in only one place in the same drawing.

[0040] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation", "screwing" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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, for ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The present utility model is described in detail below in conjunction with the accompanying drawings.

[0041] Example:

[0042] A nozzle air supply device for adjusting air supply area comprises a nozzle 1, the air supply port of the nozzle 1 is provided with an air outlet area adjustment mechanism, the air outlet area adjustment mechanism comprises a chassis 2, a bracket 4, a fan blade combination located therebetween, and a transmission structure for driving the fan blade combination to be relatively closed or opened, the fan blade combination comprises a plurality of fan blades 3 distributed in a circular array with the center of the bracket 4 as the center, the fan blades 3 are polygonal blade structures, and when the fan blade combination is in a fully closed state, all the fan blades 3 form a 360° overall closed air supply port.

[0043] In this embodiment, the nozzle 1 is used as the air supply end of the air conditioner, and an air outlet area adjustment mechanism is provided at the air supply port of the nozzle 1. The air outlet area adjustment mechanism includes a chassis 2, a bracket 4, a fan blade combination located between the two, and a transmission structure for driving the fan blade combination to be relatively closed or opened. The fan blades are controlled to cooperate by adding a transmission structure, and the rotation of the bracket drives each fan blade to close or open each other. Specifically: when the air conditioner is working normally, each fan blade 3 is in a mutually open state, at this time, the air supply area is 100%; when the air conditioner load changes, the air supply device reduces the fan operation frequency, at this time, the bracket 4 is rotated to drive each fan blade 3 to close each other, and the air supply area is reduced by the mutual closing of the fan blades 3, so that the air supply area is adjusted. In this way, even if the fan operation frequency is reduced, due to the reduction of the air supply area, the air supply wind speed of the nozzle 1 does not change basically, which ensures the air supply coverage range and can achieve energy saving; when each fan blade 3 is completely closed, all the fan blades 3 are assembled into a 360° overall closed air supply port.

[0044] Furthermore, in the present embodiment, it can also be considered that the nozzle 1, chassis 2, fan blades 3 and bracket 4 are arranged in sequence, the chassis 2 is concentrically arranged and fixedly connected to the nozzle 1, the bracket 4 is concentrically arranged and rotatably connected to the chassis 2, and the bracket 4 can be driven by a motor or other similar driving member to rotate with its center as the center of a circle.

[0045] Furthermore, in this embodiment, it can also be considered that the nozzle 1 is cylindrical, the chassis 2 and the bracket 4 are both circular, the diameter of the bracket 4 is larger than the diameter of the chassis 2, and the nozzle 1, chassis 2 and bracket 4 are all concentrically arranged.

[0046] Furthermore, in the present embodiment, it can also be considered that the middle positions of the bracket 4, the chassis 2 and the nozzle 1 respectively have a first through hole 41, a second through hole 21 and a third through hole for allowing air to pass through, and the first through hole 41, the second through hole 21 and the third through hole together constitute an air supply path for allowing air to pass through, and the first through hole 41, the second through hole 21 and the third through hole are all circular holes, and the diameters of the first through hole 41, the second through hole 21 and the third through hole are the same.

[0047] Furthermore, in this embodiment, it can also be considered that there are several blades 3, which are distributed in parallel between the chassis 2 and the bracket 4, and each blade 3 is driven by a transmission structure to close or open, so as to achieve the closing or opening of the path or the adjustment of the opening amplitude. Taking this embodiment as an example, the number of blades 3 is 6.

[0048] Furthermore, in this embodiment, it can also be considered that the transmission structure includes:

[0049] A transmission groove 22 is provided on a side of the chassis 2 facing the bracket 4 and is located outside the second through hole 21. The transmission groove 22 is in a regular polygonal shape, and the number of sides of the transmission groove 22 is consistent with the number of the fan blades 3. The transmission groove 22 is concentrically arranged with the second through hole 21;

[0050] The number of transmission holes 42 is the same as the number of the fan blades 3. The transmission holes 42 are formed on the bracket 4 and are located outside the first through hole 41. The transmission holes 42 are arranged obliquely, and the inclination directions of the transmission holes 42 are consistent.

[0051] The transmission pin shaft 5 is slidably arranged in the transmission hole 42 in a one-to-one manner. One end of the transmission pin shaft 5 is placed in the transmission groove 22. The other end of the transmission pin shaft 5 passes through the fan blade 3 and then extends out of the transmission hole 42. After passing through the bracket 4, the transmission pin shaft 5 is fixed by a locking pin 6. The locking pin 6 is used to relatively fix and limit one side of the transmission pin shaft 5.

[0052] Furthermore, in this embodiment, it can also be considered that the inclination direction of the transmission hole 42 is counterclockwise from the side of the transmission hole 42 close to the first through hole 41, and all the transmission holes 42 together constitute an inclined guiding structure arranged in a circular array with the center of the bracket 4 as the center.

[0053] like Figure 3-5 As shown, a transmission groove 22 located on the outside of the second through hole 21 is opened on the side of the chassis 2 close to the bracket 4, and the transmission groove 22 is in the shape of a regular polygon, and the number of sides of the transmission groove is consistent with the number of fan blades. Taking this embodiment as an example, the transmission groove 22 is in the shape of a regular hexagon, and the transmission groove is concentrically arranged with the second through hole. A plurality of transmission holes 42 are also arranged on the bracket 4 on the outside of the first through hole 41, and the number of the transmission holes 42 is consistent with the number of fan blades 3. The transmission holes 42 are inclined, and the inclination directions of each transmission hole 42 are consistent. A transmission pin 5 is also arranged in each transmission hole 42, and one side of the transmission pin 5 is placed in the transmission groove 22, and the other side of the transmission pin 5 passes through the fan blade 3 and then extends out of the transmission hole 42. A connecting hole 36 for accommodating the transmission pin 5 to pass through is also opened on the fan blade 3, and each transmission pin 5 is driven to move in the transmission groove 22 and the transmission hole 42 by the rotation of the bracket 4, thereby realizing the relative closing or opening of each fan blade 3.

[0054] The rotation of the bracket 4 drives each drive pin 5 to move in the drive slot 22 and the drive hole 42, so as to realize the relative closing or opening of each fan blade 3. The transmission slot 22 and the transmission hole 42 are used to plan and limit the path of the drive pin 5, and then with the special shape and number of fan blades 3, each fan blade 3 can move simultaneously under the rotation of the bracket 4 to realize the adjustment of the air outlet area. Moreover, the air supply area can be adjusted between 40% and 100%. In actual application, the bracket 4 can be driven to rotate by a motor or other similar driving member.

[0055] Furthermore, in this embodiment, it can be considered that the fan blade 3 is provided with a connecting hole 36 for accommodating the transmission pin 5 to pass through. At the same time, 6 connecting rods are provided corresponding to the 6 fan blades, and the connecting rods can slide in the constructed transmission grooves. Through the linkage of the 6 connecting rods in the transmission grooves, the opening and closing of the 6 fan blades are controlled, thereby controlling the opening area.

[0056] Furthermore, in the present embodiment, it can also be considered that the fan blade 3 is in a pentagonal shape, and the five edges of the fan blade 3 are defined as the first edge 31, the second edge 32, the third edge 33, the fourth edge 34 and the fifth edge 35, wherein: the angle between the first edge 31 and the second edge 32 is an obtuse angle; the angle between the second edge 32 and the third edge 33 is a right angle; the angle between the third edge 33 and the fourth edge 34 is an acute angle, and the sum of the angles between the third edge 33 and the fourth edge 34 in all the fan blades 3 is 360°; the angle between the fourth edge 34 and the fifth edge 35 is an obtuse angle; the angle between the fifth edge 35 and the first edge 31 is an acute angle, and the connecting hole 36 is located at the angle between the fifth edge 35 and the first edge 31; when two adjacent fan blades 3 are matched, the third edge 33 of one fan blade 3 fits with the fourth edge 34 of the other fan blade 3.

[0057] Furthermore, in this embodiment, it can also be considered that the length dimensions of the third edge 33 and the fourth edge 34 are both greater than the diameter dimension of the first through hole 41 .

[0058] Taking this embodiment as an example, there are six fan blades 3 distributed in a circular array between the chassis 2 and the bracket 4, the relative transmission grooves 22 are in the shape of a regular hexagon, there are six transmission holes 42, and the fan blades are in the shape of a pentagon. Each of the fan blades 3 is driven by the transmission structure to close or open, thereby realizing the closing or opening of the path or the adjustment of the opening amplitude.

[0059] Furthermore, in this embodiment, it can be considered that a constraint assembly is also provided between the bracket 4 and the chassis 2, and the constraint assembly includes a constraint bolt 7 respectively placed in each transmission hole 42, the head of the constraint bolt 7 is in contact with the side wall of the chassis 2, and the other end of the constraint bolt 7 is threadedly connected with a nut after passing through the transmission hole 42. The design of the constraint assembly performs an auxiliary constraint on the relative position between the bracket 4 and the chassis 2 through the cooperation of the constraint bolt 7, so as to prevent the bracket 4 and the chassis 2 from being separated; and no fixed structure is used between the constraint bolt 7 and the bracket 4 and the chassis 2, so that the constraint bolt 7 can have a certain movement function in the transmission hole 42, and the movement of the constraint bolt 7 is used to reduce the friction generated when the bracket 4 rotates, so as to avoid the bracket 4 from getting stuck, and make the rotation of the bracket 4 more flexible.

[0060] In the above structure, when the air conditioner is working normally, the fan blades 3 are in a state of being opened to each other. At this time, the air supply area is 100%. When the air conditioning load changes, the air supply device reduces the operating frequency of the fan. At this time, the bracket 4 is rotated, and the rotation of the bracket 4 will drive the transmission pin shafts 5 to move in the transmission groove 22 and the transmission hole 42. The movement of the transmission pin shaft 5 drives the fan blades 3 to close together, and the air supply area is reduced by closing the fan blades 3. In this way, even if the operating frequency of the fan is reduced, due to the reduction of the air supply area, the air supply speed of the nozzle 1 does not change basically, thereby ensuring the air supply coverage range and achieving energy saving.

[0061] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0062] The above embodiments describe the present invention in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. A nozzle air supply device for adjusting air supply area, comprising a nozzle (1), characterized in that: The air outlet of the nozzle (1) is provided with an air outlet area adjustment mechanism, the air outlet area adjustment mechanism comprising a chassis (2), a bracket (4), a fan blade assembly located therebetween, and a transmission structure for driving the fan blade assembly to close or open, the fan blade assembly comprising a plurality of fan blades (3) distributed in a circular array with the center of the bracket (4) as the center of the circle, the fan blades (3) being a polygonal blade structure, and when the fan blade assembly is in a fully closed state, all the fan blades (3) form a 360° overall closed air outlet.

2. The nozzle air supply device for adjusting the air supply area according to claim 1, characterized in that: The nozzle (1), chassis (2), fan blades (3) and bracket (4) are arranged in sequence; the chassis (2) is concentrically arranged and fixedly connected to the nozzle (1); and the bracket (4) is concentrically arranged and rotatably connected to the chassis (2).

3. The nozzle air supply device for adjusting the air supply area according to claim 2, characterized in that: The nozzle (1) is cylindrical, the base (2) and the bracket (4) are both circular, the diameter of the bracket (4) is larger than the diameter of the base (2), and the nozzle (1), the base (2) and the bracket (4) are all concentrically arranged.

4. A nozzle air supply device for adjusting air supply area according to claim 3, characterized in that: The bracket (4), the bottom plate (2) and the nozzle (1) are respectively provided with a first through hole (41), a second through hole (21) and a third through hole for allowing air to pass through at their central positions, the first through hole (41), the second through hole (21) and the third through hole together forming an air supply path for allowing air to pass through, the first through hole (41), the second through hole (21) and the third through hole are all circular holes, and the first through hole (41), the second through hole (21) and the third through hole have the same diameter.

5. The nozzle air supply device for adjusting the air supply area according to claim 4, characterized in that: The transmission structure comprises: a transmission groove (22), which is formed on a side of the chassis (2) facing the bracket (4) and is located outside the second through hole (21); the transmission groove (22) is in the shape of a regular polygon, and the number of sides of the transmission groove (22) is consistent with the number of the fan blades (3); the transmission groove (22) and the second through hole (21) are arranged concentrically; Transmission holes (42), the number of which is the same as the number of the fan blades (3), the transmission holes (42) being opened on the bracket (4) and located outside the first through hole (41), the transmission holes (42) being arranged obliquely, and the inclination directions of the transmission holes (42) being consistent; The transmission pin shaft (5) is slidably arranged in a one-to-one correspondence in the transmission hole (42), one end of the transmission pin shaft (5) is placed in the transmission groove (22), and the other end of the transmission pin shaft (5) passes through the fan blade (3) and then extends out of the transmission hole (42). After passing through the bracket (4), the transmission pin shaft (5) is fixed by a locking pin 6.

6. A nozzle air supply device for adjusting air supply area according to claim 5, characterized in that: The transmission holes (42) are inclined in a counterclockwise direction starting from a side of the transmission holes (42) close to the first through hole (41), and all the transmission holes (42) together form an inclined guide structure arranged in a circular array with the center of the bracket (4) as the center of the circle.

7. The nozzle air supply device for adjusting the air supply area according to claim 5, characterized in that: The fan blade (3) is provided with a connecting hole (36) for allowing the transmission pin shaft (5) to pass through.

8. The nozzle air supply device for adjusting the air supply area according to claim 7, characterized in that: The fan blade (3) is in a pentagonal shape, and the five sides of the fan blade (3) are defined as a first edge (31), a second edge (32), a third edge (33), a fourth edge (34), and a fifth edge (35), wherein: The included angle between the first edge (31) and the second edge (32) is an obtuse angle; The included angle between the second edge (32) and the third edge (33) is a right angle; The angle between the third edge (33) and the fourth edge (34) is an acute angle, and the sum of the angles between the third edges (33) and the fourth edges (34) in all the fan blades (3) is 360°; The included angle between the fourth edge (34) and the fifth edge (35) is an obtuse angle; The angle between the fifth edge (35) and the first edge (31) is an acute angle, and the connecting hole (36) is located at the angle between the fifth edge (35) and the first edge (31); When two adjacent fan blades (3) are mated, the third edge (33) of one of the fan blades (3) fits with the fourth edge (34) of the other fan blade (3).

9. A nozzle air supply device for adjusting air supply area according to claim 8, characterized in that: The length dimensions of the third edge (33) and the fourth edge (34) are both greater than the diameter dimension of the first through hole (41).

10. A nozzle air supply device for adjusting air supply area according to any one of claims 5 to 7, characterized in that: A restraint component is also provided between the bracket (4) and the chassis (2).

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