Fan suitable for low-temperature working environment

Abstract

The fan suitable for the low-temperature working environment comprises a support, fan blades and a driving motor, the support comprises a bearing sleeve, and the support is arranged to be a plastic piece made of LCP materials; the fan blade is provided with a rotating shaft, a ball bearing internally provided with low-temperature grease is arranged between the rotating shaft and the bearing sleeve, the radial clearance of the ball bearing is 8-13, and the fan blade is a plastic part made of an LCP (Liquid Crystal Polymer) material; the driving motor is arranged on the support and used for driving the rotating shaft to rotate. The fan suitable for the low-temperature working environment has the advantages of being high in efficiency, low in noise, long in service life and the like in the low-temperature environment, and is suitable for stable operation in the low-temperature environment in the fields of scientific research experiments, medical freezing, food preservation and the like.

Description

A fan suitable for low-temperature working environments Technical Field

[0001] This utility model relates to the technical field of fans, and in particular to a fan suitable for low-temperature working environments. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas; it is a type of driven fluid machinery. Fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and induced draft; in air conditioning equipment and household appliances for cooling and ventilation; in grain drying and conveying; as a wind source for wind tunnels; and in air-cushioned vehicles for inflation and propulsion.

[0003] Currently, most common fans on the market are designed for use in normal temperature environments.

[0004] However, conventional fans may experience reduced efficiency, increased noise, or even damage in low-temperature environments due to poor bearing lubrication and poor low-temperature resistance of component materials. This makes it difficult for conventional fans to operate stably in low-temperature environments such as scientific research experiments, medical freezing, and food preservation. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a fan suitable for low-temperature working environments, characterized by high efficiency, low noise, and long lifespan, adaptable to stable operation in low-temperature environments such as scientific research experiments, medical freezing, and food preservation.

[0006] A fan suitable for low-temperature working environments according to an embodiment of the present invention includes:

[0007] A bracket, including a bearing sleeve, wherein the bracket is a plastic part made of LCP material;

[0008] The fan blade is equipped with a rotating shaft, and a ball bearing with low-temperature grease inside is disposed between the rotating shaft and the bearing sleeve. The radial clearance of the ball bearing is set to 8-13. The fan blades are made of LCP plastic.

[0009] A drive motor, mounted on the bracket, is used to drive the rotating shaft to rotate.

[0010] A fan suitable for low-temperature working environments according to an embodiment of the present invention has at least the following beneficial effects:

[0011] 1. This utility model, by setting up a bracket, which is made of LCP plastic, understands that LCP plastic has a low coefficient of thermal expansion, good high and low temperature resistance, and excellent mechanical properties, which makes the bracket have good structural stability in low temperature environments, thereby improving the service life of the bracket in low temperature environments, and thus improving the service life of the fan in low temperature environments.

[0012] 2. By setting the fan blades, which are made of LCP plastic parts, it can be understood that LCP plastic parts have a low coefficient of thermal expansion, good high and low temperature resistance, and excellent mechanical properties, which makes the fan blades structurally stable in low temperature environments, thereby improving the service life of the fan blades in low temperature environments, and thus improving the service life of the fan in low temperature environments.

[0013] 3. This utility model, by setting a bearing sleeve on the bracket and a rotating shaft on the fan blade, and setting a ball bearing with low-temperature grease inside between the rotating shaft and the bearing sleeve, on the one hand, the rotating shaft and the bearing sleeve are connected and rotated through the ball bearing, which can reduce the frictional resistance between the rotating shaft and the bearing sleeve, reduce the energy loss of the fan, improve the efficiency of the fan, and reduce the noise of the fan. On the other hand, the low-temperature grease inside the ball bearing has excellent ultra-low temperature performance and high speed resistance, so that the low-temperature starting torque of the ball bearing is extremely small. At the same time, the low-temperature grease has good oxidation stability, mechanical stability and colloidal stability, which makes the service life of the ball bearing extremely long. Thus, it ensures the high performance, low noise and long life of the fan, and enables the fan to operate stably in low-temperature environments in scientific research experiments, medical freezing, food preservation and other fields.

[0014] 4. This utility model sets the radial clearance of the ball bearing to 8-13. Therefore, compared with the radial clearance of conventional ball bearings, the radial clearance of the ball bearing of this invention is larger, thereby avoiding the ball bearing becoming unusable due to the reduced bearing clearance caused by low temperature in low-temperature working environments.

[0015] 5. By installing a drive motor on the bracket, the drive motor drives the rotating shaft to rotate, thereby enabling the drive motor to smoothly drive the fan blades to rotate.

[0016] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided. The ball bearing includes steel balls, an inner ring, an outer ring, and a cage. The number of steel balls is set to a plurality of them, and the plurality of steel balls are arranged circumferentially between the inner ring and the outer ring. The cage is used to position the steel balls, and the cage is made of 304 stainless steel.

[0017] The advantage is that by setting the cage material to 304 stainless steel, the strength and low-temperature resistance of the cage are improved, which in turn makes it easier for ball bearings to be used in low-temperature environments.

[0018] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided with two ball bearings, which are respectively disposed at both ends of the bearing sleeve.

[0019] The advantage is that by setting two ball bearings, which are respectively located at both ends of the bearing sleeve, the two ball bearings cooperate to provide more stable support for the bearing sleeve and the shaft, thereby further reducing the resistance to the rotation of the fan blades and improving the efficiency of the fan.

[0020] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the bracket further includes a support body, the support body being connected to one end of the bearing sleeve, and the support body being used to support the bearing sleeve.

[0021] The advantage is that by setting a bracket body on the support frame, with the bracket body connected to one end of the bearing sleeve, the bracket body is used to support the bearing sleeve, thereby enabling the fan to be stably installed on the equipment via the bracket body.

[0022] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the bracket body includes a central plate, an outer ring, and a plurality of connecting ribs connecting the central plate and the outer ring, and the bearing sleeve is disposed on the central plate.

[0023] The advantages are: by making the bracket body include a central plate, an outer ring, and several connecting ribs connecting the central plate and the outer ring, and the bearing sleeve is set on the central plate, the outer ring can provide stable support for the bracket, the connecting ribs can ensure the connection strength between the central plate and the outer ring, and thus, a gap can exist between the outer ring, the connecting ribs and the central plate, reducing the amount of material used in the bracket body, so that the bracket body can reduce material costs and weight while ensuring the support function.

[0024] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the bracket further includes at least three rubber pads, the at least three rubber pads being distributed radially outward of the outer ring, the rubber pads being used to abut against the equipment.

[0025] The advantages are: by setting at least three rubber pads, distributed radially outward on the outer ring, these pads abut against the equipment, allowing the fan to contact the equipment effectively. The rubber pads provide cushioning, significantly reducing noise and vibration during fan operation and extending the fan's lifespan.

[0026] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided with a retaining ring on the radial outer surface of the outer ring, and an annular groove is provided on the outer peripheral surface of the rubber pad, wherein the retaining ring engages with the annular groove.

[0027] The advantage is that by providing a retaining ring on the radial outer surface of the outer ring and a ring groove on the outer circumferential surface of the rubber pad, the retaining ring engages with the ring groove, thereby facilitating the positioning and installation between the rubber pad and the outer ring.

[0028] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the retaining ring has a notch, the width of which is smaller than the diameter of the ring groove.

[0029] The advantage is that by making the width of the notch smaller than the diameter of the ring groove, the rubber pad can be installed into the retaining ring through the notch, while the notch can restrict the rubber pad from detaching from the retaining ring, thereby facilitating the installation of the rubber pad and the limiting and fixing of the rubber pad and the retaining ring.

[0030] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein a PCB board is fitted around the bearing sleeve, the PCB board is electrically connected to the drive motor, and an external circuit module is also included, wherein the PCB board and the external circuit module are electrically connected by wires.

[0031] The advantage is that by mounting a PCB board on the outside of the bearing sleeve, which is electrically connected to the drive motor, and also including an external circuit module, the PCB board and the external circuit module are electrically connected by wires, thus facilitating the control of the fan operation through the external circuit module.

[0032] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the conductor includes a metal wire and a protective sleeve fitted over the metal wire, the metal wire electrically connects the PCB board and the external circuit module, and the protective sleeve is made of FEP fluoroplastic.

[0033] The advantages are: understandably, FEP fluoroplastics can withstand extreme cold and heat, remaining stable over a wide temperature range. At the same time, FEP fluoroplastics have stable electrical properties and good insulation performance at different temperatures, ensuring safe electrical use. As a result, the conductors have stable performance and long lifespan in low-temperature environments, thus ensuring the long lifespan of the fan.

[0034] According to an embodiment of the present invention, a fan suitable for low-temperature working environments is provided, wherein the external circuit module is configured as a three-phase inductive circuit.

[0035] The advantage is that, understandably, by setting the circuit of the external circuit module to a three-phase inductive circuit, there are no electronic components in the fan, thus ensuring that the electronic components are not affected when the fan is working in a low-temperature environment, thereby enabling the fan to adapt to low-temperature working environments.

[0036] 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

[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a schematic diagram of the structure of a fan suitable for low-temperature working environment according to an embodiment of the present invention;

[0039] Figure 2 is a cross-sectional view of a fan suitable for low-temperature working environments, as shown in Figure 1.

[0040] Figure 3 is an exploded view of the part shown in Figure 1;

[0041] Figure 4 is a cross-sectional view of the ball bearing shown in Figure 3;

[0042] Figure 5 is a cross-sectional view of the conductor shown in Figure 1.

[0043] Reference numerals: 100-bracket, 110-bearing sleeve, 120-fan blade, 130-shaft, 140-ball bearing, 141-steel ball, 142-inner ring, 143-outer ring, 144-cage, 145-dust cover, 150-drive motor, 160-bracket body, 170-center plate, 180-outer ring, 190-connecting rib, 200-rubber pad, 210-ring, 220-ring groove, 230-notch, 240-PCB board, 250-external circuit module, 260-wire, 270-metal wire, 280-protective sleeve, 290-frame, 300-blade, 310-inner cover, 320-first spring. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] In the description of this utility model, "several" means one or more, "multiple" 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. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The following description, in conjunction with the accompanying drawings, describes a fan suitable for low-temperature working environments according to an embodiment of the present invention.

[0049] Referring to Figures 1, 2 and 3, this utility model aims to provide an embodiment of a fan suitable for low-temperature working environments.

[0050] In this embodiment, a fan suitable for low-temperature working environments mainly includes a bracket 100, a fan blade 120, and a drive motor 150.

[0051] For bracket 100, bracket 100 includes bearing sleeve 110, and bracket 100 is a plastic part made of LCP material.

[0052] Understandably, LCP plastic parts have a low coefficient of thermal expansion, good resistance to high and low temperatures, and excellent mechanical properties, which makes the support bracket 100 structurally stable in low-temperature environments, thereby improving the service life of the support bracket 100 in low-temperature environments, and consequently improving the service life of the fan in low-temperature environments.

[0053] For the fan blade 120, the fan blade 120 is provided with a rotating shaft 130, and a ball bearing 140 with low-temperature grease inside is provided between the rotating shaft 130 and the bearing sleeve 110. The radial clearance of the ball bearing 140 is set to 8-13. The fan blade 120 is made of LCP plastic.

[0054] Understandably, LCP plastic parts have a low coefficient of thermal expansion, good resistance to high and low temperatures, and excellent mechanical properties, which makes the fan blade 120 structurally stable in low-temperature environments, thereby improving the service life of the fan blade 120 in low-temperature environments, and consequently improving the service life of the fan in low-temperature environments.

[0055] It should be explained that LCP plastic parts refer to plastic parts made from LCP plastic raw materials.

[0056] In this embodiment, a bearing sleeve 110 is installed in the bracket 100, and a rotating shaft 130 is installed in the fan blade 120. A ball bearing 140 with low-temperature grease inside is installed between the rotating shaft 130 and the bearing sleeve 110. On the one hand, the rotating shaft 130 and the bearing sleeve 110 are connected and rotated through the ball bearing 140, which can reduce the frictional resistance between the rotating shaft 130 and the bearing sleeve 110, reduce the energy loss of the fan, improve the efficiency of the fan, and reduce the noise of the fan. On the other hand, the low-temperature grease inside the ball bearing 140 has excellent ultra-low temperature performance and high-speed resistance, so that the low-temperature starting torque of the ball bearing 140 is extremely small. At the same time, the low-temperature grease has good oxidation stability, mechanical stability and colloidal stability, so that the service life of the ball bearing 140 is extremely long. Thus, the high performance, low noise and long service life of the fan are guaranteed, and the fan can operate stably in low-temperature environments in scientific research experiments, medical freezing, food preservation and other fields.

[0057] It should be explained that low-temperature grease refers to extremely low-temperature lubricating grease, such as the low-noise, long-life, low-temperature resistant lubricating grease specifically designed for low-noise fans, model LF151.

[0058] In addition, in this embodiment, the radial clearance of the ball bearing 140 is set to 8-13. Therefore, compared with the radial clearance of a conventional ball bearing 140, the radial clearance of the ball bearing 140 in this embodiment is larger, thereby avoiding the ball bearing 140 becoming unusable due to the reduced bearing clearance caused by low temperature in a low-temperature working environment.

[0059] Referring to Figure 4, in some specific embodiments, the ball bearing 140 includes steel balls 141, an inner ring 142, an outer ring 143, and a cage 144. The number of steel balls 141 is set to a plurality of them, and the plurality of steel balls 141 are arranged circumferentially between the inner ring 142 and the outer ring 143. The cage 144 is used to position the steel balls 141, and the material of the cage 144 is set to 304 stainless steel.

[0060] Understandably, by setting the material of the cage 144 to 304 stainless steel, it is beneficial to improve the strength and low-temperature resistance of the cage 144, thereby facilitating the use of the ball bearing 140 in low-temperature environments.

[0061] Furthermore, the ball bearing 140 also includes a dust cover 145, which is used to cover the gap between the inner ring 142 and the outer ring 143. The dust cover 145 is made of 304 stainless steel. Thus, on the one hand, the dust cover 145 can prevent dust from entering between the inner ring 142 and the outer ring 143, which is beneficial to improving the service life of the ball bearing 140. On the other hand, it is beneficial to improve the strength and low temperature resistance of the dust cover 145, thereby facilitating the use of the ball bearing 140 in low temperature environments.

[0062] In some specific embodiments, two ball bearings 140 are provided, and the two ball bearings 140 are respectively located at both ends of the bearing sleeve 110. This makes the support of the bearing sleeve 110 and the rotating shaft 130 by the two ball bearings 140 more stable, thereby further reducing the resistance of the fan blade 120 rotation and improving the fan efficiency.

[0063] In some specific embodiments, the bracket 100 also includes a bracket body 160, which is connected to one end of the bearing sleeve 110. The bracket body 160 is used to support the bearing sleeve 110, thereby enabling the fan to be stably installed on the equipment via the bracket body 160.

[0064] Furthermore, the bracket body 160 includes a center plate 170, an outer ring 180, and a plurality of connecting ribs 190 connecting the center plate 170 and the outer ring 180. The bearing sleeve 110 is disposed on the center plate 170. Thus, the outer ring 180 can provide stable support for the bracket 100, and the connecting ribs 190 can ensure the connection strength between the center plate 170 and the outer ring 180. In turn, gaps can exist between the outer ring 180, the connecting ribs 190 and the center plate 170, reducing the amount of material used in the bracket body 160. This allows the bracket body 160 to reduce material costs and weight while ensuring its support function.

[0065] In some specific embodiments, the bracket 100 also includes at least three rubber pads 200, which are distributed on the radial outer side of the outer ring 180. The rubber pads 200 are used to abut against the equipment, thereby enabling the fan to abut against the equipment through the rubber pads 200. The rubber pads 200 have a certain buffering effect, which can effectively reduce the noise and vibration of the fan during operation and extend the service life of the fan.

[0066] In some specific embodiments, a retaining ring 210 is provided on the radial outer surface of the outer ring 180, and an annular groove 220 is provided on the outer peripheral surface of the rubber pad 200. The retaining ring 210 engages with the annular groove 220, thereby facilitating the positioning and installation between the rubber pad 200 and the outer ring 180.

[0067] In some specific embodiments, the retaining ring 210 has a notch 230, the width of which is smaller than the diameter of the annular groove 220. It is understood that by making the width of the notch 230 smaller than the diameter of the annular groove 220, the rubber pad 200 can be installed into the retaining ring 210 through the notch 230. At the same time, the notch 230 can restrict the rubber pad 200 from detaching from the retaining ring 210, thereby facilitating the installation of the rubber pad 200 and the limiting and fixing of the rubber pad 200 and the retaining ring 210.

[0068] The drive motor 150 is mounted on the bracket 100 and is used to drive the rotating shaft 130 to rotate, thereby enabling the drive motor 150 to smoothly drive the fan blade 120 to rotate.

[0069] In some specific embodiments, the fan blade 120 includes a frame 290, a blade body 300 disposed on the frame 290, and an inner cover 310. The rotating shaft 130 is disposed inside the inner cover 310, and the drive motor 150 is disposed inside the inner cover 310. Thus, the inner cover 310 can cover and protect the drive motor 150.

[0070] In some specific embodiments, the bearing sleeve 110 is fitted with a PCB board 240, which is electrically connected to the drive motor 150. It also includes an external circuit module 250. The PCB board 240 and the external circuit module 250 are electrically connected by wires 260, thereby facilitating the control of the fan operation through the external circuit module 250.

[0071] Referring to Figure 5, specifically, the conductor 260 includes a metal wire 270 and a protective sleeve 280 that is fitted over the metal wire 270. The metal wire 270 electrically connects the PCB board 240 and the external circuit module 250. The protective sleeve 280 is made of FEP fluoroplastic.

[0072] Understandably, FEP fluoroplastics can withstand extreme cold and heat, remaining stable over a wide temperature range. At the same time, FEP fluoroplastics have stable electrical properties and good insulation performance at different temperatures, ensuring safe electrical use. As a result, the 260 conductor has stable performance and a long lifespan in low-temperature environments, thus ensuring the long lifespan of the fan.

[0073] It should be explained that FEP fluoroplastics refers to fluorinated ethylene propylene copolymer, and the protective sleeve 280 can be an FEP tube.

[0074] In some specific embodiments, the circuit of the external circuit module 250 is configured as a three-phase inductive circuit.

[0075] Understandably, by setting the circuit of the external circuit module 250 to a three-phase inductive circuit, there are no electronic components in the fan, thereby ensuring that the electronic components are not affected when the fan is working in a low-temperature environment, and thus enabling the fan to adapt to the low-temperature working environment.

[0076] In some specific embodiments, the rotating shaft 130 is slidably connected to the ball bearing 140, and also includes a first spring 320. The first spring 320 is disposed inside the inner cover 310, with one end of the first spring 320 abutting against the inner wall of the inner cover 310 and the other end of the first spring 320 abutting against the ball bearing 140. Thus, the first spring 320 can support and fix the fan blade 120 and the bracket 100. At the same time, the fan blade 120 and the bracket 100 can move along the axial direction of the rotating shaft 130, realizing a flexible connection between the fan blade 120 and the bracket 100.

[0077] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., 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.

[0078] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A fan suitable for low-temperature operating environments, characterized in that, include: A bracket (100) includes a bearing sleeve (110), the bracket (100) being a plastic part made of LCP material; a fan blade (120) is provided with a rotating shaft (130), and a ball bearing (140) with internal low-temperature grease is provided between the rotating shaft (130) and the bearing sleeve (110), the radial clearance of the ball bearing (140) being set to 8-13. The fan blade (120) is made of LCP plastic; the drive motor (150) is mounted on the bracket (100) and is used to drive the rotating shaft (130) to rotate.

2. A fan suitable for low-temperature working environments according to claim 1, characterized in that, The ball bearing (140) includes steel balls (141), an inner ring (142), an outer ring (143), and a cage (144). The number of steel balls (141) is multiple, and the multiple steel balls (141) are arranged circumferentially between the inner ring (142) and the outer ring (143) of the ball bearing (140). The cage (144) is used to position the steel balls (141), and the material of the cage (144) is 304 stainless steel.

3. A fan suitable for low-temperature working environments according to claim 1, characterized in that, The bracket (100) also includes a support body (160), which is connected to one end of the bearing sleeve (110) and is used to support the bearing sleeve (110).

4. A fan suitable for low-temperature working environments according to claim 3, characterized in that, The bracket body (160) includes a center plate (170), an outer ring (180), and a plurality of connecting ribs (190) connecting the center plate (170) and the outer ring (180). The bearing sleeve (110) is disposed on the center plate (170).

5. A fan suitable for low-temperature working environments according to claim 4, characterized in that, The bracket (100) also includes at least three rubber pads (200), which are distributed radially outside the outer ring (180) and are used to abut against the device.

6. A fan suitable for low-temperature working environments according to claim 5, characterized in that, The outer ring (180) has a retaining ring (210) on its radial outer surface, and the rubber pad (200) has an annular groove (220) on its outer peripheral surface. The retaining ring (210) engages with the annular groove (220).

7. A fan suitable for low-temperature working environments according to claim 6, characterized in that, The retaining ring (210) has a notch (230) with a width smaller than the diameter of the ring groove (220).

8. A fan suitable for low-temperature working environments according to claim 3, characterized in that, The bearing sleeve (110) is covered with a PCB board (240), which is electrically connected to the drive motor (150). It also includes an external circuit module (250), which is electrically connected to the PCB board (240) and the external circuit module (250) via a wire (260).

9. A fan suitable for low-temperature working environments according to claim 8, characterized in that, The conductor (260) includes a metal wire (270) and a protective sleeve (280) fitted over the metal wire (270). The metal wire (270) electrically connects the PCB board (240) and the external circuit module (250). The protective sleeve (280) is made of FEP fluoroplastic.

10. A fan suitable for low-temperature working environments according to claim 8, characterized in that, The external circuit module (250) is configured as a three-phase inductive circuit.

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