Motor fixing structure and full-premixing fan with same

Abstract

The utility model discloses a motor fixed structure and have its full premixing fan, relate to fan technical field, include: fan, the fan includes volute and the fan wheel in volute, be provided with fan shaft hole on the volute, motor, the motor includes rotor and motor shell, the rotor has motor shaft, the motor shell lower side middle position is provided with lower boss, be provided with motor shaft hole on the lower boss, shock pad, be located between the motor with the fan, the shock pad cover is located the lower boss outside wall, the vibration that the motor and the fan produced in the air extraction working process, through the buffering effect of shock pad realizes the attenuation effect, and the resonance that produces around the motor shaft is dissolved in the direction of the specific, effectively reduces the noise, and the fan works more quiet and stable.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a motor fixing structure and a fully premixed fan having the same. Background Technology

[0002] For fully premixed gas water heaters, the gas and air are completely mixed by a premixed fan before combustion. The premixed fan requires a motor shaft to rotate, driving the impeller inside the fan. If the motor and impeller vibrate, resonance can easily occur around the motor shaft, resulting in significant noise from the motor and fan, directly impacting the user experience of the water heater. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor fixing structure and a fully premixed fan having the same.

[0004] According to a first aspect of the present invention, a motor fixing structure includes: a fan, the fan including a volute and a fan wheel inside the volute, the volute having a fan shaft hole; a motor located on the upper side of the volute, the motor including a rotor and a motor housing, the rotor having a motor shaft, a lower boss provided at the middle position of the lower side of the motor housing, the lower boss having a motor shaft hole, the lower end of the motor shaft passing through the motor shaft hole and the fan shaft hole and connecting to the fan wheel; and a shock-absorbing pad located between the motor and the fan, the shock-absorbing pad being sleeved on the outer wall of the lower boss.

[0005] According to some embodiments of the present invention, the motor housing includes an upper motor cover plate and a lower motor main housing. The rotor is located inside the motor main housing. A PCB board is provided on the upper side of the rotor. A circuit board through hole is opened on the PCB board. The upper end of the motor shaft passes through the circuit board through hole upward. A heat dissipation fan is provided on the upper end of the motor shaft. A heat dissipation hole is opened on the motor cover plate.

[0006] According to some embodiments of the present invention, a rotor mounting platform is provided inside the main housing of the motor, the rotor mounting platform has a rotor mounting cavity, and the rotor is located inside the rotor mounting cavity; the lower boss has a lower boss cavity, the lower boss cavity is located below the rotor mounting cavity, and a lower rotor bearing is provided inside the lower boss cavity, the lower rotor bearing is fitted onto the motor shaft.

[0007] According to some embodiments of this utility model, the inner sidewall of the motor main housing is provided with a support rib, which abuts against the lower edge of the PCB board; the upper surface of the rotor mounting platform is provided with a PCB board mounting hole, which is fixed to the PCB board by screws.

[0008] According to some embodiments of the present invention, the shock-absorbing pad has a bottom ring and a side sleeve, the upper side of the bottom ring abuts against the outer bottom wall of the lower boss, and the inner side wall of the side sleeve abuts against the outer side wall of the lower boss.

[0009] According to some embodiments of the present invention, the bottom ring is provided with anti-slip texture, which presses against the upper side of the volute.

[0010] According to some embodiments of the present invention, a connecting column is provided on the upper outer edge of the fan, and a connecting column mounting hole is provided at the upper end of the connecting column. A motor mounting hole is provided on the outer wall of the motor housing, and the connecting column mounting hole and the motor mounting hole are connected by fastening screws.

[0011] The motor fixing structure according to the embodiment of this utility model has at least the following technical effects: 1. The vibration generated by the motor and fan during the air extraction process is damped by the shock-absorbing pad, which effectively eliminates the resonance generated around the motor shaft, reducing noise and making the fan work more quietly and stably. 2. The motor cover and the motor housing 230 are detachable. First, install the rotor and related components, then install the cooling fan on the motor shaft, then install the PCB board, and finally install the motor cover and put the shock-absorbing pad on the lower boss of the motor. The assembly process is simple and convenient. 3. The upper side of the bottom ring of the shock-absorbing pad abuts against the outer bottom wall of the lower boss, and the inner side wall of the pad side sleeve abuts against the outer side wall of the lower boss, ensuring that the shock-absorbing pad is firmly installed on the lower boss and is not easy to loosen.

[0012] The fully premixed fan according to a second aspect of the present invention includes a motor fixing structure according to the first aspect of the present invention described above.

[0013] According to some embodiments of the present invention, the volute includes an upper fan cover plate and a lower main volute, the fan shaft hole is located on the fan cover plate, the impeller is located inside the main volute, the side wall of the main volute has an air outlet opening, and the lower side of the main volute has an air inlet opening.

[0014] According to some embodiments of this utility model, an air inlet shell is covered on the lower side of the air inlet opening, and a gas interface is provided on the side wall of the air inlet shell, which is connected to a gas source; an air guide tube is provided inside the air inlet shell, and the lower end of the air guide tube has a lower through hole, the bottom wall of the air inlet shell is connected to the wall of the lower through hole of the air guide tube, and the upper end of the air guide tube has an upper through hole, which is located below the impeller.

[0015] The fully premixed fan according to the embodiments of this utility model has at least the following beneficial effects: 1. The vibration generated by the motor and fan during the air extraction process is damped by the shock-absorbing pad, which effectively eliminates the resonance generated around the motor shaft, reducing noise and making the fully premixed fan quieter and more stable when it is working. 2. The fan cover and the main volute are detachable, which facilitates the installation of the impeller inside the main volute; 3. Outside air enters the air intake shell through the air interface, and the fuel gas enters the air intake shell through the fuel gas interface. In this way, the air and fuel gas are premixed inside the air intake shell, providing a stable environment for the premixing of air and fuel gas, which is conducive to more stable and reliable operation of the fully premixed fan.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the motor fixing structure of this utility model and the fully premixed fan having it. Figure 2 This is an exploded view of the structure of the fully premixed fan of this utility model; Figure 3 This is an exploded view of the motor fixing structure of this utility model; Figure 4 This is an exploded view of the motor fixing structure of this utility model from another angle; Figure 5 This is a cross-sectional view of the fully premixed fan of this utility model; Figure 6 This is a cross-sectional view of the motor fixing structure of this utility model; Figure 7 This is a three-dimensional sectional view of the motor housing of this utility model; Figure 8 This is a three-dimensional sectional view of the shock-absorbing pad of this utility model.

[0018] Figure label: Fan 100, volute 110, fan cover 120, fan shaft hole 121, connecting column 122, connecting column mounting hole 123, cover sealing ring 124, main volute 130, air outlet 131, air inlet 132, impeller 140; Motor 200, motor housing 210, motor cover 220, heat dissipation hole 221, motor main housing 230, lower boss 231, lower boss cavity 232, motor shaft hole 233, rotor mounting platform 234, rotor mounting cavity 235, PCB board mounting plate Mounting hole 236, support rib 237, motor mounting hole 238, rotor 240, motor shaft 241, PCB board 250, circuit board through hole 251, cooling fan blade 260, rotor lower bearing 270, stator 280; shock damping pad 300, bottom ring 310, anti-slip texture 311, side sleeve 320, sealing convex ring 321; fastening screw 400; air inlet shell 500, gas interface 510, air duct 521, lower through hole of air duct 521, upper through hole of air duct 522, flow deflector 523. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "multiple" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] The following is for reference. Figure 1 and Figure 2 This invention describes a motor fixing structure according to an embodiment of the present invention.

[0024] like Figure 1 and Figure 2 As shown, the motor fixing structure according to an embodiment of the present utility model includes a fan 100, a motor 200, and a shock-absorbing pad 300.

[0025] The fan 100 includes a volute 110 and a fan wheel 140 inside the volute 110. The volute 110 has a fan shaft hole 121. The motor 200 is located on the upper side of the volute 110. The motor 200 includes a rotor 240 and a motor housing 210. The rotor 240 has a motor shaft 241. A lower boss 231 is provided at the middle position of the lower side of the motor housing 210. A motor shaft hole 233 is provided on the lower boss 231. The lower end of the motor shaft 241 passes through the motor shaft hole 233 and the fan shaft hole 121 and is connected to the fan wheel 140. The shock-absorbing pad 300 is located between the motor 200 and the fan 100. The shock-absorbing pad 300 is sleeved on the outer wall of the lower boss 231.

[0026] For example, such as Figure 1 and Figure 2 As shown, the fan 100 includes a volute 110 and a rotor 140 inside the volute 110, which operates within the volute 110. A fan shaft hole 121 is provided on the volute 110. A motor 200 is located on the upper side of the volute 110 and is fixedly connected to the fan 100. The motor 200 includes a rotor 240 and a motor housing 210. The rotor 240 has a motor shaft 241 and operates within the motor housing 210. A lower boss 231 is provided at the lower center of the motor housing 210, and a motor shaft hole 233 is provided on the lower boss 231. The lower end of the motor shaft 241 passes through the motor shaft hole 233 and the fan shaft hole 121 and connects to the rotor 140, enabling the rotor 240 to drive the rotor 140 to rotate. A shock-absorbing pad 300 is located between the motor 200 and the fan 100, and is fitted onto the outer wall of the lower boss 231. That is, the shock-absorbing pad 300 is fixed on the lower boss 231 of the motor 200.

[0027] During actual installation, refer to Figure 3 , Figure 4 First, mount the shock-absorbing pad 300 onto the lower boss 231 of the motor 200. Then, align the motor 200 with the fan 100 so that the lower end of the motor shaft 241 can pass through the motor shaft hole 233 and the fan shaft hole 121 in sequence and connect with the impeller 140 inside the fan 100.

[0028] Thus, in actual work, refer to Figure 5When the motor 200 is started, it drives the impeller 140 inside the volute 110 to rotate via the motor shaft 241, thus performing air extraction. During this extraction process, although the motor 200 and fan 100 vibrate, this vibration is damped by the shock-absorbing pads 300. This effectively eliminates the resonance that would normally occur around the motor shaft 241, thanks to the shock-absorbing pads 300 mounted on the lower boss 231 in the middle of the motor 200. This significantly reduces noise during operation, resulting in a quieter and more stable operation for the fan.

[0029] In some embodiments of this utility model, reference is made to Figure 3 , Figure 4 The motor housing 210 includes an upper motor cover plate 220 and a lower motor main housing 230. The rotor 240 is located inside the motor main housing 230. A PCB board 250 is provided on the upper side of the rotor 240, and a circuit board through hole 251 is opened on the PCB board 250. The upper end of the motor shaft 241 passes through the circuit board through hole 251. A heat dissipation fan 260 is provided on the upper end of the motor shaft 241, and a heat dissipation hole 221 is opened on the motor cover plate 220. When the rotor 240 rotates, the motor shaft 241 drives the fan wheel 140 to rotate and also drives the heat dissipation fan 260 to rotate, thereby dissipating heat from the PCB board 250 and other components. The hot air is dissipated from the heat dissipation hole 221.

[0030] The motor cover 220 and the motor housing 230 are detachable. After opening the motor cover 220, the rotor 240, PCB board 250, and cooling fan 260 can be installed inside the motor housing 230. During assembly, first install the rotor 240 and related components, then install the cooling fan 260 onto the motor shaft 241, and then install the PCB board 250, including soldering the terminals on the PCB board 250. Finally, install the motor cover 220 and fit the shock-absorbing pad 300 onto the lower boss 231 of the motor 200. The above assembly process is simple and convenient, ensuring smooth assembly of the motor 200 and guaranteeing its sufficient stability and reliability.

[0031] In addition, during the above assembly process, the PCB board 250 can be installed first, followed by the heat dissipation fan blades 260.

[0032] In some embodiments of this utility model, reference is made to Figure 6 , Figure 7The motor housing 230 is provided with a rotor mounting platform 234, which has a rotor mounting cavity 235. The rotor 240 is located in the rotor mounting cavity 235. The lower boss 231 has a lower boss cavity 232, which is located below the rotor mounting cavity 235. The lower boss cavity 232 is provided with a rotor lower bearing 270, which is mounted on the motor shaft 241.

[0033] The rotor 240 is installed within the rotor mounting cavity 235, ensuring a stable and reliable installation. The lower rotor bearing 270 is installed within the lower boss cavity 232, ensuring smoother rotation of the motor shaft 241 guided by the lower rotor bearing 270. This, in turn, ensures more stable operation of the rotor 240.

[0034] In a further embodiment of the present invention, the stator 280 is connected to the inner wall of the rotor mounting cavity 235, and the stator 280 surrounds the rotor 240.

[0035] In some embodiments of this utility model, a support rib 237 is provided on the inner side wall of the motor main housing 230, and the support rib 237 abuts against the lower edge of the PCB board 250. A PCB board mounting hole 236 is provided on the upper surface of the rotor mounting platform 234, and the PCB board mounting hole 236 is fixed to the PCB board 250 with screws. This ensures a more stable installation of the PCB board 250.

[0036] In some embodiments of this utility model, reference is made to Figure 6 , Figure 8 The shock-absorbing pad 300 has a bottom ring 310 and a side sleeve 320. The upper side of the bottom ring 310 abuts against the outer bottom wall of the lower boss 231, and the inner side wall of the side sleeve 320 abuts against the outer side wall of the lower boss 231, ensuring that the shock-absorbing pad 300 is firmly installed on the lower boss 231, is not easy to loosen, and has an effective shock-absorbing effect.

[0037] In a further embodiment of this utility model, a sealing ring 321 is provided at the upper end of the side sleeve 320. The sealing ring 321 presses against the lower side of the outer bottom wall of the motor main housing 230, further making the shock-absorbing pad 300 more stable.

[0038] In some embodiments of this utility model, the bottom ring 310 is provided with anti-slip texture 311 on the lower side. The anti-slip texture 311 presses against the upper side of the volute 110 to ensure that the bottom ring 310 of the shock-absorbing pad 300 and the volute 110 of the fan 100 will not slip, thereby further ensuring the shock absorption effect of the shock-absorbing pad 300.

[0039] In some embodiments of this utility model, reference is made to Figure 1 , Figure 2A connecting post 122 is provided on the upper outer edge of the fan 100. A connecting post mounting hole 123 is provided at the upper end of the connecting post 122. A motor mounting hole 238 is provided on the outer wall of the motor housing 210. The connecting post mounting hole 123 and the motor mounting hole 238 are connected by a fastening screw 400. This effectively secures the fan 100 and motor 200 together at the outer position of the motor 200, ensuring a more stable and reliable installation of the motor 200 on the fan 100.

[0040] The fully premixed fan according to a second aspect of the present invention includes a motor fixing structure according to the first aspect of the present invention described above.

[0041] According to the embodiments of the present invention, the fully premixed fan, by adopting the above-mentioned motor fixing structure, reduces the installation difficulty of the fully premixed fan, makes the overall assembly simple and compact, reduces quality control requirements, and helps to reduce costs and improve production efficiency.

[0042] In some embodiments of this utility model, reference is made to Figure 2 The volute 110 includes an upper fan cover plate 120 and a lower main volute 130. A fan shaft hole 121 is located on the fan cover plate 120. The impeller 140 is located inside the main volute 130. An air outlet 131 is provided on the side wall of the main volute 130, and an air inlet 132 is provided on the lower side of the main volute 130. When the impeller 140 rotates, airflow enters the main volute 130 through the air inlet 132 and exits through the air outlet 131. The fan cover plate 120 and the main volute 130 are detachable, facilitating the installation of the impeller 140 inside the main volute 130.

[0043] In some embodiments of this utility model, reference is made to Figure 5 A cover sealing ring 124 is provided between the fan cover plate 120 and the main volute 130 to prevent airflow from leaking out from the gap between the fan cover plate 120 and the main volute 130.

[0044] In some embodiments of this utility model, an air inlet shell 500 covers the lower side of the air inlet opening 132. A gas inlet interface 510 is provided on the side wall of the air inlet shell 500, and the gas inlet interface 510 is connected to a gas source. An air guide duct 520 is provided inside the air inlet shell 500. The lower end of the air guide duct 520 has a lower through hole 521, and the bottom wall of the air inlet shell 500 is connected to the wall of the lower through hole 521. The upper end of the air guide duct 520 has an upper through hole 522, which is located below the impeller 140. Outside air enters the air guide duct 520 through the lower through hole 521 and then passes through the upper through hole 522 into the air inlet shell 500. Gas enters the air inlet shell 500 through the gas inlet interface 510. This means that the air is output from the air guide duct 520 at a central position, and the gas surrounds the air output from the air guide duct 520, thus pre-mixing the air and gas within the air inlet shell 500. This provides a stable environment for the premixing of air and gas, which makes the fully premixed fan work more stably and reliably.

[0045] In a further embodiment of this utility model, a flow-damping plate 523 is distributed on the outer wall of the air guide duct 520, so that the gas entering the air inlet shell 500 is slowed down by the flow-damping plate 523 to ensure that the air and gas are fully mixed.

[0046] Other components and operations of the fully premixed fan according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0047] The following is for reference. Figure 1 and Figure 2 The motor fixing structure according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0048] like Figure 1 and Figure 2 As shown, the fully premixed fan according to an embodiment of the present invention includes a fan 100, a motor 200, a shock-absorbing pad 300, a fastening screw 400, and an air inlet shell 500.

[0049] The fan 100 includes a volute 110 and a rotor 140. The volute 110 includes a fan cover plate 120 and a main volute 130. The fan cover plate 120 is provided with a fan shaft hole 121, a connecting column 122, a connecting column mounting hole 123, and a cover plate sealing ring 124. The main volute 130 is provided with an air outlet 131 and an air inlet 132.

[0050] The motor 200 is connected to the fan 100 by fastening screws 400. The motor 200 includes a motor housing 210, within which are housed a rotor 240, a motor shaft 241, a PCB board 250, circuit board through holes 251, a cooling fan 260, a rotor lower bearing 270, and a stator 280. The motor housing 210 includes a motor cover plate 220 and a motor main housing 230. The motor cover plate 220 has cooling holes 221. The motor main housing 230 has a lower boss 231, a lower boss cavity 232, a motor shaft hole 233, a rotor mounting platform 234, a rotor mounting cavity 235, a PCB board mounting hole 236, a support rib 237, and a motor mounting hole 238. A shock-absorbing pad 300 is fitted onto the lower boss 231. The shock-absorbing pad 300 includes a bottom ring 310, anti-slip texture 311, a side sleeve 320, and a sealing ring 321.

[0051] The air inlet housing 500 is equipped with a gas interface 510, an air duct 520, a lower through hole 521 for the air duct, an upper through hole 522 for the air duct, and a flow damper 523.

[0052] In some embodiments of this utility model, the motor assembly steps are as follows: 1. Install the rotor 240 and stator 280 within the rotor mounting cavity 235; 2. Install the cooling fan blades 260 onto the motor shaft 241; 3. Then install PCB board 250 and solder the terminals on PCB board 250; 4. Install the motor cover plate 220; 5. Install the shock-absorbing pad 300 on the lower boss 231 of the motor 200.

[0053] In some embodiments of this utility model, the assembly steps of the fully premixed fan are as follows: 1. A shock-absorbing pad 300 is installed on the lower boss 231 of the motor 200; 2. Place the motor 200 in the appropriate position on the fan cover plate 120, and tighten the fastening screws 400 after installation; 3. Mount the impeller 140 onto the motor shaft 210 and adjust its balance; 4. Install the main volute 130 onto the fan cover 120; 5. Install the air inlet casing 500.

[0054] According to the motor fixing structure of this utility model embodiment, by setting it up in this way, at least the following effects can be achieved: the vibration generated by the motor 200 and the fan 100 during the air extraction process is attenuated by the buffering effect of the shock-absorbing pad 300, and the resonance generated around the motor shaft 241 is specifically eliminated, effectively reducing noise, and the fan of this utility model is quieter and more stable when it is working.

[0055] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor fixing structure, characterized in that, include: A fan (100) includes a volute (110) and a fan wheel (140) inside the volute (110), and a fan shaft hole (121) is provided on the volute (110). The motor (200) is located on the upper side of the volute (110). The motor (200) includes a rotor (240) and a motor housing (210). The rotor (240) has a motor shaft (241). A lower boss (231) is provided at the middle position of the lower side of the motor housing (210). A motor shaft hole (233) is provided on the lower boss (231). The lower end of the motor shaft (241) passes through the motor shaft hole (233) and the fan shaft hole (121) and is connected to the impeller (140). A shock-absorbing pad (300) is located between the motor (200) and the fan (100), and the shock-absorbing pad (300) is sleeved on the outer wall of the lower boss (231).

2. The motor fixing structure according to claim 1, characterized in that, The motor housing (210) includes an upper motor cover plate (220) and a lower motor main housing (230). The rotor (240) is located inside the motor main housing (230). A PCB board (250) is provided on the upper side of the rotor (240). A circuit board through hole (251) is provided on the PCB board (250). The upper end of the motor shaft (241) passes through the circuit board through hole (251) upward. The upper end of the motor shaft (241) is provided with a heat dissipation fan (260), and the motor cover plate (220) is provided with heat dissipation holes (221).

3. The motor fixing structure according to claim 2, characterized in that, The motor housing (230) is provided with a rotor mounting platform (234), the rotor mounting platform (234) has a rotor mounting cavity (235), and the rotor (240) is located in the rotor mounting cavity (235); The lower boss (231) has a lower boss cavity (232), which is located below the rotor mounting cavity (235). A rotor lower bearing (270) is provided in the lower boss cavity (232), and the rotor lower bearing (270) is mounted on the motor shaft (241).

4. The motor fixing structure according to claim 3, characterized in that, The inner wall of the motor housing (230) is provided with a support rib (237), and the support rib (237) abuts against the lower edge of the PCB board (250); The upper surface of the rotor mounting platform (234) is provided with a PCB board mounting hole (236), and the PCB board mounting hole (236) and the PCB board (250) are fixed together by screws.

5. The motor fixing structure according to claim 1, characterized in that, The shock-absorbing pad (300) has a bottom ring (310) and a side sleeve (320). The upper side of the bottom ring (310) abuts against the outer bottom wall of the lower boss (231), and the inner side wall of the side sleeve (320) abuts against the outer side wall of the lower boss (231).

6. The motor fixing structure according to claim 5, characterized in that, The bottom ring (310) is provided with anti-slip texture (311) on the lower side, and the anti-slip texture (311) presses against the upper side of the volute (110).

7. The motor fixing structure according to claim 1, characterized in that, A connecting post (122) is provided on the upper outer edge of the fan (100). A connecting post mounting hole (123) is provided at the upper end of the connecting post (122). A motor mounting hole (238) is provided on the outer wall of the motor housing (210). The connecting post mounting hole (123) and the motor mounting hole (238) are connected by fastening screws (400).

8. A fully premixed fan, characterized in that, Includes the motor fixing structure according to any one of claims 1 to 7.

9. The fully premixed fan according to claim 8, characterized in that, The volute (110) includes an upper fan cover plate (120) and a lower main volute (130). The fan shaft hole (121) is located on the fan cover plate (120), the impeller (140) is located inside the main volute (130), the side wall of the main volute (130) is provided with an air outlet (131), and the lower side of the main volute (130) is provided with an air inlet (132).

10. The fully premixed fan according to claim 9, characterized in that, The air inlet opening (132) is covered by an air inlet shell (500) on the lower side. A gas interface (510) is provided on the side wall of the air inlet shell (500), and the gas interface (510) is connected to a gas source. An air guide tube (520) is provided inside the air inlet shell (500). The lower end of the air guide tube (520) has a lower through hole (521). The bottom wall of the air inlet shell (500) is connected to the hole wall of the lower through hole (521). The upper end of the air guide tube (520) has an upper through hole (522). The upper through hole (522) is located below the impeller (140).

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