An insulated fan

Abstract

The application discloses a heat-insulated fan, which comprises a shell, a motor, a transmission disc, an impeller and a circular cover. The front side of the shell is provided with an air inlet. The impeller is located in the shell. The motor is rotationally and drivably connected with the transmission disc. The impeller comprises a plurality of circumferentially spaced blades. The plurality of blades enclose a negative pressure cavity. The negative pressure cavity faces the air inlet. The circular cover is located in the negative pressure cavity. The circular cover covers the front end surface of the transmission disc. The end surface of the transmission disc is provided with an air suction channel. The front and rear ends of the air suction channel are communicated with the inner cavity of the circular cover and the outside of the shell. A plurality of air diffusers are circumferentially and spaced between the bottom edge of the circular cover and the transmission disc. The air diffusers are communicated with the negative pressure cavity and face the blades. The inner wall of the circular cover is provided with guide grooves. The guide grooves are diverged from the center of the inner wall of the circular cover and are one-to-one communicated with the air diffusers. The circular cover of the application forms a cold air heat-insulated space for the front end surface of the transmission disc, so as to isolate the high-temperature medium from the transmission disc, improve the cooling effect of the transmission disc, reduce the eddy current and further reduce the noise.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fans, and particularly to a heat-insulated fan. Background Technology

[0002] According to the requirements of ceramic production processes, the ventilation system of ceramic machinery needs to be equipped with centrifugal fans. The centrifugal fan contains a transmission disc and an impeller connected to it. Because the temperature of the medium transported inside the fan reaches 200℃, the rotation of the impeller draws in the high-temperature medium and throws it out from around the impeller. If the motor drive shaft directly drives the transmission disc to rotate the impeller, the high-temperature medium entering from the front of the fan can easily be transferred through the transmission disc to the drive shaft and then to the motor, affecting the motor's lifespan. To reduce the impact of high temperatures on motor operation, workers perforate the transmission disc to increase its heat dissipation area. Simultaneously, because this perforation connects the rear of the fan to the fan interior, the negative pressure inside the fan cavity will draw in cool air through the perforation to achieve a cooling effect. However, the cooling effect through the perforation is limited, and the cool air and the high-temperature medium entering the motor are in opposite directions, causing turbulent airflow and high noise. Summary of the Invention

[0003] The purpose of this invention is to provide a heat-insulating fan to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this invention is:

[0005] A heat-insulating fan includes a housing, a motor, a transmission disk, and an impeller. The housing has an air inlet at its front side. The impeller is located inside the housing, and its rear side is connected to the transmission disk. The motor drives the transmission disk to rotate. The impeller includes multiple blades spaced circumferentially, forming a negative pressure chamber facing the air inlet. The fan also includes a circular cover located inside the negative pressure chamber, covering the front end face of the transmission disk. The transmission disk has an air intake channel on its end face, with its front and rear ends connected to the inner cavity of the circular cover and the outside of the housing, respectively. Multiple air diffusers are circumferentially spaced between the bottom edge of the circular cover and the transmission disk, communicating with the negative pressure chamber and facing the blades. The inner wall of the circular cover has guiding grooves, which radiate from the center of the inner wall and connect one-to-one with the air diffusers.

[0006] This technical solution has at least the following beneficial effects: the suction channel runs through the transmission disc from front to back, and the opening of the circular cover faces rearward and covers the front end of the transmission disc. When the motor drives the transmission disc to rotate, the gas in the negative pressure chamber formed by the blades is thrown out from the gaps between the blades, making the negative pressure chamber negative. The high-temperature medium enters the negative pressure chamber from the air inlet on the front side of the shell. At the same time, because the inner cavity of the circular cover is connected to the negative pressure chamber through the air outlet, and the suction channel connects the inner cavity of the circular cover to the outside, the negative pressure effect generated by the negative pressure chamber causes cold air from the outside to be continuously drawn into the inner cavity of the circular cover through the suction channel, and then guided by the guide groove to the air outlet at the bottom of the circular cover, and finally thrown out by the high-temperature medium. The air diffuses outwards and spreads outwards. The inner cavity of the circular cover of this invention continuously draws in cold air to form a cold air insulation space for the front end of the transmission disc, which is used to isolate the high-temperature medium from the transmission disc. The cold air insulation space enhances the insulation effect, reduces heat transfer, and continuously cools the front end of the transmission disc, carrying away the heat of the circular cover and improving the cooling effect on the transmission disc, thus extending the service life of the motor. Furthermore, the air diffuser is directly facing the direction of the blades to prevent the cold air from colliding with the high-temperature medium, so that the flow direction of the cold air follows the flow direction of the high-temperature medium from the negative pressure cavity, reducing airflow turbulence. At the same time, the cold air in the circular cover is neatly thrown out under the guidance of the guide groove, reducing the generation of eddies and thus reducing noise.

[0007] As a further improvement to the above technical solution, the multiple guide slots are spirally diverging. The cold air is spirally discharged from the diffuser inside the shroud, reducing airflow fluctuations and aerodynamic noise. Moreover, the spiral guide slots improve the travel path of the cold air inside the shroud, increase the cooling time of the shroud and the transmission disc, and enhance the heat insulation effect of the cold air.

[0008] As another improvement to the above technical solution, multiple suction channels are arranged circumferentially along the central axis of the transmission disk. The multiple suction channel holes are spaced apart circumferentially with the transmission disk as the center. When the impeller rotates, cool air can be evenly drawn into the inner cavity of the circular cover by the multiple suction channels, increasing the cooling area of ​​the transmission disk and ensuring uniform cooling of the transmission disk and the heat insulation space inside the circular cover, further improving the heat dissipation effect.

[0009] As a further improvement to the above technical solution, the air intake channel is obliquely arranged along the extension direction of the guide groove. Cold air flows obliquely into the hood through the air intake channel and continues to flow in the direction of the guide groove, improving the smoothness of cold air flow, preventing cold air from vertically entering the hood, reducing the impact of cold air and the generation of eddies, thereby reducing noise.

[0010] As a further improvement to the above technical solution, the front end face of the transmission disc is provided with a first expansion groove. The first expansion groove is located between two adjacent air intake channels. One end of the first expansion groove is connected to the air intake channel, and the other end of the first expansion groove extends along the extension direction of the guide groove. The first expansion groove increases the opening at the outlet end of the air intake channel, providing a buffering effect for cold air entering the inner cavity of the shroud, reducing vibration caused by the sudden change in the cross-section of the cold air entering the space, and reducing noise. At the same time, the first expansion groove follows the setting direction of the air intake channel and extends with the guide groove, further improving the guiding effect on the cold air.

[0011] As another improvement to the above technical solution, the transmission disk is provided with fan blades at the rear side of the impeller. The fan blades are arranged circumferentially around the central axis of the transmission disk, and the rear end of the suction channel is located within the surrounding area of ​​the multiple fan blades. The multiple fan blades are arranged at intervals around the transmission disk, and the arrangement center of the fan blades coincides with the arrangement center of the suction channel. Furthermore, the multiple fan blades surround the outer side of the rear end of the through hole. As the transmission disk rotates, the fan blades surrounding the suction channel exert a suction effect, enhancing the efficiency of cold air entering the suction channel from the outside, thereby improving the heat insulation effect of the cold air insulation space. At the same time, the blades can turbulently affect the air around the transmission disk, providing auxiliary heat dissipation around the transmission disk and reducing the heat transfer of hot air to the transmission disk.

[0012] As a further improvement to the above technical solution, the front end of the transmission disk extends into the housing, and there is an auxiliary suction gap between the rear end face of the impeller and the housing. The fan blade includes an axial section and a longitudinal section. The axial section extends forward along the side wall of the transmission disk into the housing. The front end of the axial section is bent to form the longitudinal section. The longitudinal section diverges away from the center of the transmission disk and faces the auxiliary suction gap. The rear end face of the housing has a mounting hole through which the transmission disc and motor shaft extend into the housing. The axial section extends forward from the outside of the housing into the housing. There is a gap between the axial section of the fan blade and the inner wall of the mounting hole to ensure the rotation of the fan blade. The auxiliary suction gap and the mounting hole are interconnected. When the motor drives the transmission disc to rotate, the axial section located outside the housing can further assist the cold air into the suction channel, improving the cold air intake efficiency. The longitudinal section is located inside the volute, and its diverging end faces the auxiliary suction gap, allowing the rotating longitudinal section to assist in the intake of cold air through the mounting hole, forming a secondary intake channel for cold air. At the same time, the rotating longitudinal section can disturb the cold air and the diffused high-temperature medium in the auxiliary suction gap, causing the cold air drawn in through the mounting hole to disperse the high-temperature medium, reducing the direct heat transfer to the transmission disc and improving the cooling effect.

[0013] As another improvement to the above technical solution, the rear end face of the transmission disk is provided with a second expansion groove. The second expansion groove extends away from the center of the transmission disk to the side wall of the transmission disk, and the second expansion groove and the suction channel form an arc transition. First, cold air can be drawn into the suction channel through the second expansion groove. The second expansion groove increases the air intake area of ​​the through hole, thereby increasing the air intake volume of cold air, enhancing the cooling effect of the transmission disk, and reducing heat transfer between the motor and the transmission disk. Second, the arc-shaped second expansion groove provides a buffer and transition effect for the entry of cold air, reducing the generation of vortices at the inlet of the suction channel, reducing the impact of cold air, and thus reducing noise.

[0014] As a further improvement to the above technical solution, the inner wall of the second expansion channel is provided with multiple rubber particles at intervals. The rubber particles themselves have resilience, and when cold air passes through the second expansion channel, the rubber particles use their own resilience to absorb the vibration generated when the cold air flows through, thereby reducing the noise of the incoming air.

[0015] As another improvement to the above technical solution, the rear end face of the impeller is provided with blades, which are arranged radially around the negative pressure chamber. When the impeller rotates, the blades create a pressure difference in the auxiliary suction gap, allowing external cold air to pass through the mounting hole, the longitudinal section of the fan blades, and into the auxiliary suction gap in sequence. Finally, it is drawn into the inner cavity of the housing and flows away with the high-temperature medium, forming a secondary inlet channel for cold air. This ensures that cold air can be drawn into the auxiliary suction gap to cool the rear side of the transmission disc and the rear end face of the impeller, while preventing the inflow of high-temperature medium or the accumulation of heat, thereby improving the heat dissipation effect on the transmission disc. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of the housing, transmission disc, impeller, shroud, and motor in an insulated fan provided according to an embodiment of the present invention;

[0018] Figure 2 This is a rear view of a dome provided in an embodiment of the present invention;

[0019] Figure 3 This is a rear view of a transmission disc provided in an embodiment of the present invention;

[0020] Figure 4 This is a front view of a transmission disc provided in an embodiment of the present invention;

[0021] Figure 5This is a front view of a transmission disc provided in an embodiment of the present invention;

[0022] Figure 6 yes Figure 5 A magnified view of the area circled in the middle;

[0023] Figure 7 This is an overall view of a heat-insulating fan provided in an embodiment of the present invention.

[0024] In the attached diagram: 110-shell, 111-air inlet, 120-motor, 131-front plate, 132-rear plate, 133-blade, 134-negative pressure chamber, 140-transmission disc, 141-suction channel, 150-circular cover, 160-blade, 170-auxiliary suction gap, 180-mounting hole, 210-guide slot, 220-diffuser, 310-fan blade, 320-second expansion slot, 410-first expansion slot, 510-axial section, 520-longitudinal section, 610-granules, 710-base. Detailed Implementation

[0025] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connection relationships mentioned herein do not simply refer to direct connection of components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in the present invention can be combined interactively without contradicting each other.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0027] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include 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 indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] Reference Figure 1 The heat insulation fan includes a housing 110, a motor 120, a transmission disc 140, and an impeller. The housing 110 is a volute type. The front side of the housing 110 is provided with an air inlet 111, and the side wall of the housing 110 is provided with an air outlet. The impeller is located inside the housing 110, and the rear side of the impeller is connected to the transmission disc 140. The motor 120 drives the transmission disc 140 to rotate, thereby driving the pressure roller to rotate.

[0030] Furthermore, the impeller includes blades 133, and a front plate 131 and a rear plate 132 spaced apart. Multiple blades 133 are circumferentially spaced and form a negative pressure chamber 134, which faces forward and directly opposite the air inlet 111. It also includes a circular cover 150 located within the negative pressure chamber 134, covering the front end face of the transmission disc 140. The end face of the transmission disc 140 is provided with a suction channel 141, the front end of which is connected to… Through the inner cavity of the circular cover 150, the rear end of the air intake channel 141 is connected to the outside of the housing 110. A plurality of air diffusers 220 are circumferentially spaced between the bottom edge of the circular cover 150 and the transmission disk 140. The air diffusers 220 are interconnected with the negative pressure chamber 134 and face the blade 133. The inner wall of the circular cover 150 is provided with a guide groove 210. The plurality of guide grooves 210 radiate from the center of the inner wall of the circular cover 150 and are connected one-to-one to the air diffusers 220.

[0031] Specifically, the central axis and rotation axis of the transmission disk 140 and the central axis and rotation axis of the impeller are coincident. The air suction channel 141 runs through the transmission disk 140 from front to back. The opening of the circular cover 150 faces backward and covers the front end of the transmission disk 140. The working principle is as follows: When the motor 120 drives the transmission disk 140 to rotate, the gas in the negative pressure chamber 134 formed by the blades 133 is thrown out from the gap between the blades 133, so that the negative pressure chamber 134 is in a negative pressure state. The high temperature medium enters the negative pressure chamber 134 from the air inlet 111 on the front side of the shell 110. Meanwhile, because the inner cavity of the dome 150 is connected to the negative pressure chamber 134 through the air vent 220, and the air intake channel 141 connects the inner cavity of the dome 150 with the outside, the negative pressure effect generated by the negative pressure chamber 134 causes the cold air from the outside to be continuously drawn into the inner cavity of the dome 150 through the air intake channel 141, and then guided by the guide groove 210 to the air vent 220 at the bottom edge of the dome 150, and finally overflows in all directions in accordance with the direction of the high temperature medium being thrown out.

[0032] The inner cavity of the circular cover 150 of the present invention continuously draws in cold air to form a cold air heat insulation space for the front end face of the transmission disk 140, which is used to isolate the high-temperature medium from the transmission disk 140. Air has good heat insulation properties, and the continuous flow of cold air in the cold air heat insulation space further enhances the heat insulation effect, reduces heat transfer, and continuously cools the front end face of the transmission disk 140, carrying away the heat of the circular cover 150, improving the cooling effect on the transmission disk 140, and extending the service life of the motor 120. Furthermore, the air vent 220 is directly facing the direction of the blade 133 to prevent the cold air from colliding with the high-temperature medium, so that the flow direction of the cold air follows the flow direction of the high-temperature medium from the negative pressure chamber 134, reducing airflow turbulence. At the same time, the cold air in the circular cover 150 is neatly thrown out under the guidance of the guide groove 210, reducing the generation of eddies and thus reducing noise.

[0033] In addition, the cold air from the intake channel hits the inner wall of the dome 150. The arc-shaped inner wall of the dome 150 can guide the cold air, so that the cold air is evenly dispersed around the dome 150. Finally, it flows through the edge of the dome 150 and is blown out from the air outlet 220. The cold air flows evenly under the guiding effect of the dome 150, realizing the uniformity of the internal temperature of the cold air insulation space and ensuring that the transmission disc 140 is heated evenly.

[0034] In practice, to ensure the heat insulation effect of the dome 150 on the transmission disk 140, the dome 150 is directly fixed to the front end face of the rear plate 132 of the impeller by bolts or other means. This makes the inner diameter of the bottom edge of the dome 150 larger than the overall outer diameter of the transmission disk 140, ensuring that the dome 150 can completely cover the transmission disk 140 and reducing the direct transfer of heat to the transmission disk 140. In this embodiment, the impeller and the transmission disk 140 can be fixed together by bolts, and the dome 150 is connected to the impeller by multiple bolts spaced apart. There is a first gap between the inner wall of the dome 150 and the transmission disk 140, and a second gap between the bolts connecting the dome 150 and the impeller. The first gap and the second gap communicate to form the air diffuser 220.

[0035] Furthermore, the plurality of the guide slots 210 are spirally diverging.

[0036] Specifically, the cold air is spirally discharged from the diffuser 220 inside the shroud 150, reducing airflow fluctuations and aerodynamic noise. Moreover, the spiral guide groove 210 increases the travel path of the cold air inside the shroud 150, increases the cooling time of the shroud 150 and the drive plate 140, and enhances the heat insulation effect of the cold air.

[0037] It should be noted that the guide groove 210 can also fit the circular cover 150 and extend in a straight line to the air diffuser 220, which is convenient for processing.

[0038] Furthermore, the plurality of the suction channels 141 are arranged circumferentially along the central axis of the transmission disk 140.

[0039] Specifically, multiple air intake channels 141 are arranged circumferentially around the transmission disk 140. When the impeller rotates, cold air can be evenly drawn into the inner cavity of the shroud 150 by the multiple air intake channels 141, increasing the cooling area of ​​the transmission disk 140 and ensuring uniform cooling of the heat insulation space between the transmission disk 140 and the shroud 150, thereby further improving the heat dissipation effect.

[0040] Furthermore, the air intake channel 141 is obliquely arranged along the extension direction of the guide groove 210.

[0041] Specifically, the cold air flows obliquely into the shroud 150 through the air intake channel 141 and continues to flow in the direction of the guide groove 210, which improves the smoothness of the cold air flow, prevents the cold air from hitting the shroud 150 vertically, reduces the impact of the cold air and the generation of eddies, and thus reduces noise.

[0042] It should be noted that, without considering the noise caused by the direct vertical impact of cold air on the dome 150, the suction channel 141 can actually extend laterally back and forth. During processing, it is only necessary to continuously feed the drill bit at an angle towards the adjustment plate.

[0043] Furthermore, the front end face of the transmission disk 140 is provided with a first expansion groove 410. The first expansion groove 410 is located between two adjacent air suction channels 141. One end of the first expansion groove 410 is connected to the air suction channel 141, and the other end of the first expansion groove 410 extends along the extension direction of the guide groove 210.

[0044] Specifically, the first expansion groove 410 increases the opening at the outlet end of the suction channel 141, providing a buffering effect for the cold air entering the inner cavity of the dome 150, reducing vibration caused by the sudden change in the cross-section of the cold air entering the space, and reducing noise. At the same time, the first expansion groove 410 follows the setting direction of the suction channel 141 and extends with the guide groove 210, further improving the guiding effect of the cold air. In fact, in this embodiment, the first expansion groove 410 is an arc-shaped groove, and the radius of the first expansion groove 410 coincides with the central axis of the adjusting plate, which is convenient for processing. Moreover, the front end extension direction of the first expansion groove 410 and the suction channel 141 are the same as the rotation direction of the guide groove 210.

[0045] Furthermore, the transmission disk 140 is provided with fan blades 310 at the rear side of the impeller, and the fan blades 310 are arranged circumferentially around the central axis of the transmission disk 140. The rear end of the air intake channel 141 is located within the surrounding area of ​​the multiple fan blades 310.

[0046] Specifically, multiple fan blades 310 are arranged in an array around the transmission disk 140, with the center of the fan blades 310 coinciding with the center of the air intake channel 141. The multiple fan blades 310 surround the outer side of the rear end of the through hole. As the transmission disk 140 rotates, the fan blades 310 surrounding the air intake channel 141 have an air intake effect, enhancing the efficiency of cold air entering the air intake channel 141 from the outside, thereby improving the heat insulation effect of the cold air insulation space. At the same time, the blades 133 can turbulentize the air around the transmission disk 140, providing auxiliary heat dissipation around the transmission disk 140 and reducing the heat transfer of hot air to the transmission disk 140.

[0047] Furthermore, the front end of the transmission disk 140 extends into the housing 110, and there is an auxiliary suction gap 170 between the rear end face of the impeller and the housing 110. The fan blade 310 includes an axial section 510 and a longitudinal section 520. The axial section 510 extends forward along the side wall of the transmission disk 140 into the housing 110. The front end of the axial section 510 is bent to form the longitudinal section 520. The longitudinal section 520 diverges in a direction away from the center of the transmission disk 140 and faces the auxiliary suction gap 170.

[0048] Specifically, a mounting hole 180 is provided on the rear end face of the housing 110. The transmission disk 140 and the motor 120 shaft extend into the housing 110 through the mounting hole 180. The axial section 510 extends forward from outside the housing 110 into the housing 110. Moreover, there is a gap between the axial section 510 of the fan blade 310 and the inner wall of the mounting hole 180 to ensure the rotation of the fan blade 310. The auxiliary suction gap 170 and the mounting hole 180 are interconnected. When the motor 120 drives the transmission disk 140 to rotate, the axial section 510 located outside the housing 110 can... To further assist the cold air in entering the suction channel 141 and improve the cold air intake efficiency, the longitudinal section 520 is located inside the volute, and its diverging end is directly opposite the auxiliary suction gap 170. This allows the rotating longitudinal section 520 to assist in the intake of cold air through the mounting hole 180, forming a secondary intake channel for cold air. At the same time, the rotating longitudinal section 520 can disturb the cold air and the diffused high-temperature medium in the auxiliary suction gap 170, causing the cold air drawn in through the mounting hole 180 to disperse the high-temperature medium, reducing the direct heat transfer to the transmission disc 140 and improving the cooling effect.

[0049] Furthermore, the rear end face of the transmission disk 140 is provided with a second expansion groove 320, which extends away from the center of the transmission disk 140 to the side wall of the transmission disk 140, and the second expansion groove 320 and the suction channel 141 are arc-shaped transitions.

[0050] Specifically, firstly, cold air can be drawn into the suction channel 141 through the second expansion groove 320. The second expansion groove 320 increases the air intake area of ​​the through hole, thereby increasing the air intake volume of cold air, enhancing the cooling effect of the transmission plate 140, and reducing the heat transfer between the motor 120 and the transmission plate 140. Secondly, the arc-shaped second expansion groove 320 provides a buffer and transition effect for the entry of cold air, reducing the generation of vortices at the inlet of the suction channel 141, reducing the impact of cold air, and thus reducing noise.

[0051] In this embodiment, the second expansion groove 320 is located between two adjacent fan blades 310.

[0052] Two adjacent fan blades 310 are spaced apart, and the second expansion groove 320 is positioned directly opposite the space between the two fan blades 310 to prevent the fan blades 310 from blocking the air intake of the suction channel 141, ensuring the air intake area, improving the cold air flow, and ensuring structural reliability. In addition, the position of the second expansion groove 320 relative to the fan blades 310 can also be random, as long as it can connect to the suction channel 141.

[0053] Reference Figure 6 In this embodiment, the inner wall of the second expansion groove 320 is provided with a plurality of adhesive particles 610 at intervals.

[0054] Specifically, the granules 610 themselves have resilience. When cold air passes through the second expansion groove 320, the granules 610 use their own resilience to absorb the vibration generated when the cold air flows through, thereby reducing the noise of the air intake.

[0055] Furthermore, the impeller includes a front plate 131 and a rear plate 132 spaced apart, a plurality of blades 133 connecting the front plate 131 and the rear plate 132, and a blade 160 provided on the rear end face of the rear plate 132, the blade 160 being arranged radially around the negative pressure chamber 134.

[0056] Specifically, when the impeller rotates, the blade 160 creates a pressure difference in the auxiliary suction gap 170, allowing external cold air to pass through the mounting hole 180, the longitudinal section 520 of the fan blade 310, and enter the auxiliary suction gap 170 in sequence. Finally, it is drawn into the inner cavity of the housing 110 and flows away with the high-temperature medium, forming a secondary intake channel for cold air. This ensures that cold air can be drawn into the auxiliary suction gap 170 to cool the rear side of the drive disc 140 and the rear end face of the impeller, while preventing the inflow of high-temperature medium or the accumulation of heat, thereby improving the heat dissipation effect on the drive disc 140.

[0057] Furthermore, in this embodiment, the surrounding sealing cotton around the mounting hole 180 prevents the high-temperature medium inside the housing 110 from leaking out. At the same time, sound-absorbing cotton is layered on the sealing cotton to reduce the noise generated when cold air enters the mounting hole 180.

[0058] Reference Figure 7 In this embodiment, both the motor 120 and the housing 110 are mounted on the base 710. Insulation cotton can be provided between the motor 120 and the base 710, and between the housing 110 and the base 710, to reduce heat transfer.

[0059] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A heat-insulating fan, comprising a housing, a motor, a transmission disk, and an impeller, wherein an air inlet is provided on the front side of the housing, the impeller is located inside the housing, the rear side of the impeller is connected to the transmission disk, the motor is connected to the transmission disk for rotational drive, the impeller includes multiple blades arranged circumferentially, the multiple blades forming a negative pressure chamber, the negative pressure chamber facing forward directly towards the air inlet, characterized in that: The circular cover is located in the negative pressure cavity, covers the front end surface of the transmission disc, and is provided with an air suction channel.

2. A heat shielded fan as claimed in claim 1, wherein: The air suction channels are arranged along the central axis of the transmission disc.

3. A heat shielded fan as claimed in claim 1, wherein: The air suction channels are arranged along the extension direction of the guide grooves.

4. A heat shielded fan as claimed in claim 3, wherein: The front end surface of the transmission disc is provided with a first expansion groove.

5. A heat shielded fan as claimed in claim 4, characterised in that: The transmission disc is provided with a plurality of fan blades at the position behind the impeller.

6. A heat shielded fan as claimed in claim 1, wherein: The front end of the transmission disc extends into the shell.

7. A heat shielded fan as claimed in claim 6, characterised in that: The rear end surface of the impeller is provided with a plurality of leaf plates.

8. A heat shielded fan as claimed in claim 6, wherein: ​ 9. A heat shielded fan as claimed in claim 8, characterised in that: ​ 10. A heat shielded fan as claimed in claim 1 or 7, wherein: ​

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