Air inlet structure of fan

Abstract

The utility model provides an air inlet structure of a fan, and belongs to the technical field of machinery. The problem that an existing fan is inconvenient to assemble is solved. The air inlet structure of the fan comprises a volute and a ventilation net, an impeller cavity is formed in the volute, an upper round hole and a lower round hole are formed in the upper side and the lower side of the impeller cavity in a penetrating mode respectively, an air guide ring is arranged in the upper round hole in a penetrating mode, and an inner hole of the air guide ring is a volute air inlet hole; the positioning rings are pressed at the upper ends of the air guide rings, the net-shaped parts cover the upper end openings of the air guide rings, a bolt is arranged in each positioning ring in a penetrating mode, an annular step is arranged on the outer wall of the head of each bolt, each annular step is composed of an annular side face and an annular bottom face, the annular side faces are located on the inner sides of the corresponding positioning rings, and the annular bottom faces abut against the top walls of the positioning rings; the bottom faces of the heads of the bolts abut against the air guide ring, threaded holes are formed in the volute, the number of the threaded holes is the same as that of the bolts, and the rod portions of the bolts are screwed into the threaded holes. The air inlet structure of the fan is convenient to assemble the fan.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical technical field relates to a fan especially a fan's air intake structure. BACKGROUND

[0002] The fan is the fluid machine of converting mechanical energy into gas pressure energy and kinetic energy, and is mainly used for gas delivery and pressure increase.

[0003] The existing fan structure such as the air blower (application number: 202020504218.1) disclosed in Chinese patent library includes the shell made of plastic material and having a cavity inside and the driving motor fixed on one side of the shell, the side wall of the shell has the air outlet arranged protruding and communicated with the cavity inside the shell along the circumference of the shell, the output shaft of the driving motor is fixed with the wind wheel, and the shell is integral, the shell has the first mounting hole penetrating and the first mounting hole makes the cavity inside the shell communicated with the outside, the outer diameter of the wind wheel is less than the inner diameter of the first mounting hole, and the axial center line of the wind wheel passes through the center of the first mounting hole, the positioning ring in the form of ring is fixed on the edge of the first mounting hole, and the air net in the form of net is fixed on the positioning ring.

[0004] In the above-mentioned air blower, the positioning ring and the air net are both installed and positioned by a circle of screws, and the installation positions of each circle of bolts are staggered, resulting in more installation operation steps and more complicated assembly. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in the prior art and provides an air intake structure of a fan convenient to assemble.

[0006] The utility model can be realized by the following technical scheme: an air intake structure of a fan, including volute and air net, the volute is formed with impeller cavity inside, the upper and lower sides of the impeller cavity are respectively provided with upper circular hole and lower circular hole, the air guide ring is arranged in the upper circular hole, the upper end outer wall of the air guide ring is formed with annular seat, the annular seat is pressed on the volute, the inner hole of the air guide ring is the air inlet hole of the volute, the air net includes the net-shaped part in the form of circle and the positioning ring formed on the outer wall of the net-shaped part, the positioning ring is pressed on the upper end of the air guide ring, and the net-shaped part covers the upper end port of the air guide ring, the bolt is arranged in each positioning ring, and the outer wall of the bolt head is provided with the annular step coaxial with the bolt, the annular step is formed with annular side surface and annular bottom surface, the annular side surface is located on the inner side of the positioning ring, and the annular bottom surface is pressed on the top wall of the positioning ring, the bottom surface of the bolt head is pressed on the air guide ring, the volute is provided with the threaded hole, the number of threaded holes is same as that of bolts, and the positions are one-to-one corresponding, the bolt rod passes through the air guide ring and is screwed into the corresponding threaded hole.

[0007] The annular step is arranged to enable the bolt head to press against the positioning ring and the air guide ring at the same time, so as to simultaneously press the ventilation net against the air guide ring and press the air guide ring against the volute, that is, the ventilation net and the air guide ring are positioned synchronously after the bolt is locked, so that the assembly steps are effectively reduced, and the advantages of simple structure and convenient assembly are achieved.

[0008] In the air inlet structure of the fan, a plurality of convex tubes are vertically formed on the outer wall of the volute, the number of the convex tubes is the same as that of the bolts, and the inner holes of the convex tubes are the threaded holes. By adopting the above design, the length of the threaded hole can be effectively prolonged, so as to increase the locking force of the bolt and improve the structural stability of the air inlet structure.

[0009] In the air inlet structure of the fan, a plurality of insertion grooves are formed on the inner wall of the air guide ring, the number of the insertion grooves is the same as that of the convex tubes, and the upper ends of the convex tubes are inserted into the corresponding insertion grooves. The convex tubes and the insertion grooves are matched to facilitate the insertion and positioning of the air guide ring.

[0010] In the air inlet structure of the fan, a tapered guide surface is arranged on the outer wall of the upper end of the convex tube, and the guide surface extends to the top surface of the convex tube. The guide surface is used for guiding the insertion of the convex tube into the insertion groove, thereby further facilitating the assembly.

[0011] In the air inlet structure of the fan, an annular positioning step is arranged on the inner edge of the top wall of the air guide ring, and the positioning step is coaxially arranged with the air guide ring. A plurality of relief grooves are formed in the top wall of the air guide ring, the number of the relief grooves is the same as that of the positioning rings, and the positions of the relief grooves and the positioning rings correspond one by one. One side of each relief groove is communicated with the positioning step, the edge of the mesh part is pressed against the bottom wall of the positioning step, and each positioning ring is pressed against the bottom wall of the corresponding relief groove. The positioning step and the relief groove are matched to limit the installation position of the ventilation net, so that the ventilation net is installed in place at one time, thereby further facilitating the assembly.

[0012] In the air inlet structure of the fan, the volute is a plastic integral part, and the diameter of the lower circular hole is larger than the size of the fan impeller.

[0013] Compared with the prior art, the air inlet structure of the fan has the following advantages:

[0014] 1. The annular step is arranged to enable the bolt head to press against the positioning ring and the air guide ring at the same time, so as to simultaneously press the ventilation net against the air guide ring and press the air guide ring against the volute, that is, the ventilation net and the air guide ring are positioned synchronously after the bolt is locked, so that the assembly steps are effectively reduced, and the advantages of simple structure and convenient assembly are achieved.

[0015] 2. The positioning step and the relief groove are matched to limit the installation position of the ventilation net, so that the ventilation net is installed in place at one time, thereby further facilitating the assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1is a three-dimensional schematic view of the fan.

[0017] Figure 2 is a schematic view of the air inlet structure of the fan.

[0018] Figure 3 is Figure 2 an enlarged schematic view at A in the middle.

[0019] Figure 4 is a connection schematic view of the air guide ring and the ventilation net.

[0020] In the figure, 1, volute; 1a, impeller cavity; 1b, lower circular hole; 1c, convex pipe; 1d, air inlet face; 2, ventilation net; 2a, net part; 2b, positioning ring; 3, air guide ring; 3a, annular seat; 3b, air inlet hole; 3c, positioning step; 3d, accommodation slot; 3e, insertion slot; 4, bolt; 4a, annular step; 4a1, annular side surface; 4a2, annular bottom surface. DETAILED DESCRIPTION

[0021] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0022] As Figure 1 shown, the air inlet structure of the fan includes the volute 1 and the ventilation net 2.

[0023] Specifically,

[0024] The volute 1 is formed with an impeller cavity 1a, and the upper and lower sides of the impeller cavity 1a are respectively provided with an upper circular hole and a lower circular hole 1b, and the upper circular hole, the lower circular hole 1b and the impeller cavity 1a are coaxially arranged. Among them, the air guide ring 3 is arranged in the upper circular hole, at this time, the air guide ring 3 and the impeller cavity 1a are coaxially arranged, the upper end of the air guide ring 3 extends out of the volute 1, and the lower end of the air guide ring 3 extends into the impeller cavity 1a. As Figures 2 to 4 shown, the upper end of the air guide ring 3 is formed with an annular seat 3a, and the annular seat 3a is coaxial with the air guide ring 3. The annular seat 3a is pressed on the volute 1, at this time, the annular seat 3a covers the upper circular hole, and the inner hole of the air guide ring 3 is the air inlet hole 3b of the volute 1.

[0025] The ventilation net 2 is a one-piece structure, which includes a circular net part 2a and a ring of positioning rings 2b formed on the outer wall of the net part 2a, and the ring of positioning rings 2b is evenly distributed along the circumference of the net part 2a. In actual products, the number of positioning rings 2b is 4, and the sidewall of each positioning ring 2b is connected to the net part 2a through a straight bar segment. Among them, the positioning ring 2b is pressed on the upper end of the air guide ring 3, and the net part 2a covers the upper end of the air guide ring 3.

[0026] As Figure 2 and Figure 3As shown, a bolt 4 is arranged in each positioning ring 2b, and an annular step 4a coaxial with the bolt 4 is arranged on the outer wall of the head of the bolt 4. The annular step 4a is composed of a vertical annular side surface 4a1 and an annular bottom surface 4a2. The annular side surface 4a1 is located at the inner side of the corresponding positioning ring 2b, and the annular bottom surface 4a2 is pressed against the top wall of the positioning ring 2b. The bottom surface of the head of the bolt 4 is pressed against the air guide ring 3. The volute 1 is provided with threaded holes, and the number of the threaded holes is the same as that of the bolts 4, and the positions of the threaded holes correspond to those of the bolts 4. The rod part of the bolt 4 penetrates through the air guide ring 3 and is screwed into the corresponding threaded hole.

[0027] The annular step 4a is arranged to press the head of the bolt 4 against the positioning ring 2b and the air guide ring 3 at the same time, so as to press the ventilation net 2 against the air guide ring 3 and press the air guide ring 3 against the volute 1, that is, the ventilation net 2 and the air guide ring 3 are positioned synchronously after being locked by the bolt 4, so as to effectively reduce the assembly steps and have the advantages of simple structure, convenient assembly and the like.

[0028] Further, as shown in Figs. 1 and 2, Figure 3 and Figure 4 The top wall of the air guide ring 3 is provided with an annular positioning step 3c, and the positioning step 3c is coaxial with the air guide ring 3. The top wall of the air guide ring 3 is further provided with a position giving slot 3d for containing the positioning ring 2b. The number of the position giving slots 3d is the same as that of the positioning rings 2b, and the positions of the position giving slots 3d correspond to those of the positioning rings 2b. One side of each position giving slot 3d is communicated with the positioning step 3c. The edge of the net part 2a is pressed against the bottom wall of the positioning step 3c, and each positioning ring 2b is pressed against the bottom wall of the corresponding position giving slot 3d. At this time, the bottom surface of the head of the bolt 4 is also pressed against the bottom wall of the position giving slot 3d. The positioning step 3c and the position giving slot 3d are matched to limit the installation position of the ventilation net 2, so as to install the ventilation net 2 in place at one time, thereby further facilitating the assembly.

[0029] In the embodiment,

[0030] The threaded holes are formed in the following manner. A circle of convex tubes 1c is vertically formed on the outer wall of the volute 1. The number of the convex tubes 1c is the same as that of the bolts 4, and the inner holes of the convex tubes 1c are the above-mentioned threaded holes. The above-mentioned design can effectively prolong the length of the threaded holes, so as to increase the locking force of the bolt 4 and improve the structural stability of the air inlet structure. Further, the inner wall of the air guide ring 3 is provided with insertion grooves 3e matched with the convex tubes 1c. The number of the insertion grooves 3e is the same as that of the convex tubes 1c, and the upper ends of the convex tubes 1c are inserted into the corresponding insertion grooves 3e. The convex tubes 1c and the insertion grooves 3e are matched to guide the insertion of the air guide ring 3, thereby facilitating the assembly. Further, the outer wall of the upper end of the convex tube 1c is provided with a tapered guide surface 1d. The diameter of the guide surface 1d gradually decreases from top to bottom, and the guide surface 1d extends to the top surface of the convex tube 1c. The guide surface 1d is used for guiding the insertion of the convex tube 1c into the insertion groove 3e, thereby further facilitating the assembly.

[0031] In the actual product, the volute 1 and the guide ring 3 are plastic integral parts. The hole diameter of the lower circular hole 1b is greater than the size of the fan impeller. When assembled, the impeller is put into the impeller cavity 1a through the lower circular hole 1b.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. An air inlet structure of a fan, comprising a volute (1) and a ventilation net (2), the volute (1) is formed with an impeller cavity (1a) therein, the upper and lower sides of the impeller cavity (1a) are respectively provided with upper and lower circular holes (1b), a wind guide ring (3) is arranged in the upper circular hole, the upper end outer wall of the wind guide ring (3) is formed with an annular seat (3a), the annular seat (3a) is pressed on the volute (1), and the inner hole of the wind guide ring (3) is the air inlet hole (3b) of the volute (1), the ventilation net (2) comprises a circular net-shaped part (2a) and a ring of positioning rings (2b) formed on the outer wall of the net-shaped part (2a), the positioning rings (2b) are pressed on the upper end of the wind guide ring (3), and the net-shaped part (2a) covers the upper end port of the wind guide ring (3), a bolt (4) is arranged in each positioning ring (2b), characterized in that, The outer wall of the head of the bolt (4) is provided with an annular step (4a) coaxial with the bolt (4), the annular step (4a) is composed of an annular side surface (4a1) and an annular bottom surface (4a2), the annular side surface (4a1) is located inside the positioning ring (2b), and the annular bottom surface (4a2) is pressed on the top wall of the positioning ring (2b); the bottom surface of the head of the bolt (4) is pressed on the air guide ring (3), the volute (1) is provided with threaded holes, the number of the threaded holes and the number of the bolts (4) are the same, and the positions of the threaded holes and the bolts (4) correspond to each other one by one, the rod part of the bolt (4) penetrates through the air guide ring (3) and is screwed into the corresponding threaded hole.

2. The air intake structure of a fan according to claim 1, wherein The outer wall of the volute (1) is vertically formed with a ring of convex tubes (1c), the number of the convex tubes (1c) is the same as the number of the bolts (4), and the inner holes of the convex tubes (1c) are the threaded holes.

3. The air intake structure of a fan according to claim 2, wherein The inner wall of the air guide ring (3) is provided with insertion grooves (3e) matched with the convex tubes (1c), the number of the insertion grooves (3e) is the same as the number of the convex tubes (1c), and the upper ends of the convex tubes (1c) are inserted into the corresponding insertion grooves (3e).

4. The air intake structure of a fan according to claim 3, wherein The upper end of the outer wall of the convex tube (1c) is provided with a tapered lead-in surface (1d), and the lead-in surface (1d) extends to the top surface of the convex tube (1c).

5. The air intake structure of a fan according to claim 1, wherein The inner edge of the top wall of the air guide ring (3) is provided with a ring-shaped positioning step (3c), and the positioning step (3c) is coaxial with the air guide ring (3); the top wall of the air guide ring (3) is also provided with a gap slot (3d) for containing the positioning ring (2b), the number of the gap slots (3d) is the same as the number of the positioning rings (2b), and the positions of the gap slots (3d) and the positioning rings (2b) correspond to each other one by one; one side of each gap slot (3d) is communicated with the positioning step (3c), the edge of the mesh part (2a) is pressed on the bottom wall of the positioning step (3c), and each positioning ring (2b) is pressed on the bottom wall of the corresponding gap slot (3d).

6. The air intake structure of a fan according to claim 1, wherein The volute (1) is a plastic integral part, and the diameter of the above-mentioned lower circular hole (1b) is larger than the size of the fan impeller.

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