TWM628202U - Salt-mist prevention structure of fan motor set - Google Patents

Abstract

The present invention creates an anti-salt spray structure for a fan motor group, including a silicon steel sheet group, an insulating frame group and a cladding layer. The silicon steel sheet group is provided with an upper side and a lower side, and the upper and lower sides are connected between an outer side and a cladding layer. The inner side is surrounded by a combination hole, the insulating frame group includes an upper insulating frame and a lower insulating frame, the upper and lower insulating frames are respectively arranged on the upper side and the lower side of the silicon steel sheet group, and a coil group is wound around The upper and lower insulating frames are electrically connected to a circuit board. A first extension portion protrudes from one side of the upper insulating frame and protrudes into the coupling hole and covers a part or all of the inner side. The cladding layer covers the insulating frame set, the coil set, the silicon steel sheet set and the circuit board integrally, and the first extension part and the inner side which are not covered by the cladding layer are sleeved with a shaft tube , the outer side of the shaft tube directly or indirectly coats another part of the inner side, so as to achieve the effect of preventing salt spray.

Description

Anti-salt spray structure of fan motor group

This work is about a fan motor unit, especially a fan motor unit that can prevent salt spray and prevent rust inside the silicon steel sheet.

The current cooling fan is mainly composed of stator, fan wheel, circuit board and fan frame and other components, and in order to allow the fan to operate normally in the aforementioned harsh environment, it is necessary to prevent salt spray and moisture from eroding the internal structure of the fan. In the known technology, in order to prevent moisture and salt spray from eroding the structure of the stator and circuit board inside the fan, and causing damage to the fan, the stator and circuit board are covered with glue on the outside of the stator and circuit board to prevent the damage to the fan. Moisture and salt spray damage the stator group and circuit board.

At present, there are two ways to prevent salt spray: one is to use glue filling technology. Before glue filling, multiple silicon steel sheets must be stacked on each other to form a silicon steel sheet group. The upper and lower sides of the group are assembled with an upper insulating frame and a lower insulating frame. , and then place the assembled silicon steel sheet group and the upper and lower insulating frames in a winding machine, an opening is set in the inner center of the silicon steel sheet group and sleeved on a winding die rod of the winding machine, and the silicon steel sheet The inner side of the chip set is concave with two foolproof holes connected to the opening, which are exposed to the outside and are not covered by the upper and lower insulating frames. After the two protruding parts protruding from the outside of the die rod are inserted and positioned firmly, the winding machine can start the winding operation on the upper and lower insulating frames. The circuit boards at the bottom of the lower insulating frame are electrically connected (eg, welded) to form a motor group, and the assembled motor group is then glued. However, because the glue-filling mold used by the motor group is not actually matched, it will cause glue-filling in the glue-filling mold. When the colloid will flow into the opening of the silicon steel sheet of the motor group, there will be residual colloid inside the opening of the silicon steel sheet of the motor group, which will make it difficult to assemble on the shaft tube (shaft tube) of the fan, and cause poor assembly. question.

Therefore, in order to solve the above problems, the middle pipes of the upper and lower molds in the glue-filling mold will be matched with the openings of the silicon steel sheet group and the two foolproof holes, so that the motor group can be placed on the actual matching glue-filling mold. , When inside the lower mold, the inner side of the opening of the silicon steel sheet group is sleeved and combined with the middle pipe of the upper and lower molds in the glue-filling mold, and the outer side of the middle pipe will be tightly attached to the silicon steel sheet. The inside of the opening of the silicon steel sheet is sealed and sealed, and the upper half of the two foolproof holes of the silicon steel sheet will be covered and sealed by the upper mold, and the lower half of the two foolproof holes will be covered by the outer side of the middle tube of the lower mold. The two protruding bodies are inserted into position and sealed, so as to avoid the inflow of glue from the opening and the two foolproof holes during glue filling, and then confirm again that the motor unit has been fixed and sealed on the upper and lower parts of the glue filling mold. In the mold, to avoid the displacement of the motor size caused by the shaking up and down, the glue can be injected into the glue filling mould, and the glue filling mould can be taken out from the glue filling mould after the glue has solidified. The glue filling method mainly uses glue Fill the space around the stator and circuit board to prevent salt spray.

However, since the opening of the silicon steel sheet group and the two foolproof holes are sealed by the middle tube of the glue filling mold and its outer two convex bodies during glue filling, and are not glued, so that the glue filling can be completed. The motor unit is successfully assembled on the shaft tube of the fan, but there is an extended problem, that is, when the fan runs in a humid and salt mist environment, salt mist or moisture will infiltrate from the opening of the silicon steel sheet group and the two foolproof interiors. And it is corroded by salt spray or water vapor to rust, and then rust and water vapor produce rust water, so that the rust water will flow in the openings and the two foolproof holes of the silicon steel sheet group, resulting in the failure of the silicon steel sheet group. The entire inner side is rusted, and finally the embroidered water in the two foolproof holes will be thrown out with the rotation of the fan, causing the inside of the fan to be sprayed with rust water. inoperable problem. In addition, during the assembling process of the openings of the silicon steel sheet group being sequentially sleeved on the winding die rod of the winding machine and the middle tube of the glue filling mold, it is easy to make the winding die rod and The middle tube will accidentally scrape the electroplated layer coated on the silicon steel sheet, which will cause accelerated rusting at the scraped position on the inner side of the silicon steel sheet.

The other is to use vacuum coating technology to directly coat the assembled motor group with a thin film as described above. Since the thin film is an extremely thin polymer, although the motor can have anti-salt spray effect, the current industry It cannot be effectively put into use, because the film has anti-salt spray function to the fan's motor only for a short time in salt fog and humid environment (such as 50 hours or less), but if it is in salt fog and humid environment for a long time (such as 50 hours or less) 750 hours), it is impossible to resist salt spray to the motor of the fan, because the film will be rubbed by salt crystals for a long time, which will cause the film to rupture and lose the anti-salt spray function, and then allow the salt spray and salt to invade and cause rust and electrical circuits. The problem of short circuit burning of the board. Secondly, in the process of assembling the film-coated motor group to the shaft tube of the fan, the film on the inner side of the silicon steel sheet group will contact and rub against the outer side of the shaft tube, which is easily scratched to form a hole, and then The salt spray intrudes into the inner side of the silicon steel sheet group from the hole and causes rust. Therefore, considering the above factors, it is the main reason why the industry does not put it into use at present.

Therefore, how to solve the above-mentioned problems and deficiencies is the direction that the creator of this case and the relevant manufacturers engaged in this industry are eager to research and improve.

One objective of this creation is to provide a salt-fog-proof structure for a fan motor group that can achieve the effect of preventing salt-fog.

Another object of the present invention is to provide an anti-salt spray structure for a fan motor unit that covers the inside of a silicon steel sheet group to seal the gap to prevent the intrusion of salt spray, thereby preventing rust.

In order to achieve the above-mentioned purpose, the present invention provides an anti-salt spray structure for a fan motor set, comprising: a silicon steel sheet set with an upper side and a lower side, an outer side and an inner side are connected between the upper side and the lower side, and the inner side surrounds the structure. A combination hole is formed; an insulating frame group includes an upper insulating frame and a lower insulating frame, the upper and lower insulating frames are respectively arranged on the upper side and the lower side of the silicon steel sheet group, and a coil group is wound on the upper and lower sides. insulating frame, and is electrically connected with a circuit board, a first extension part protruding from one side of the upper insulating frame is protruding into the bonding hole and covering a part or all of the inner side of the silicon steel sheet group; a covering layer , the insulating frame group, the coil group, the silicon steel sheet group and the circuit board are integrally covered, and the inner side of the first extension part and the silicon steel sheet group not covered by the covering layer is connected to a shaft tube. For socket connection, the outer side of the shaft tube directly or indirectly covers another part of the inner side.

The outer side of the shaft tube protrudes with a platform portion, and the first extension portion protrudes into the coupling hole and covers a part of the inner side of the silicon steel sheet group, and is in contact with the platform portion. The other part of the inner side is directly covered by the outer side of the platform portion of the shaft tube. A second extension part protrudes from one side of the lower insulating frame and protrudes into the coupling hole and covers the other part of the inner side of the silicon steel sheet group, and is connected with the first extension part to jointly cover the whole Cover the whole of the inner side of the silicon steel sheet group.

The outer side of the shaft tube protrudes with a platform part, the platform part is in contact with the outer side of the second extension part, and the inner side of the silicon steel sheet group is separated by the first and second extension parts by the outer side of the platform part of the shaft tube indirect covering. The above-mentioned upper and lower insulating frames are integrally formed or not integrally formed.

The inner side of the silicon steel sheet group is longitudinally formed with at least one groove, and the outer side of the first extension portion is longitudinally protruded with at least one first protrusion protruding into the groove for wrapping and bonding. The shape of the inner side of the silicon steel sheet group is the same as the shape of the outer side of the shaft tube. At least one groove is longitudinally formed on the inner side of the above-mentioned silicon steel sheet group, and at least one first convex portion and at least one second convex portion are respectively protruded from the outer longitudinal sides of the first and second extending portions. An upper half and a lower half protruding into the groove are covered and combined.

At least one groove is longitudinally recessed relative to the inner side of the second protruding portion of the second extension portion, and the groove is fitted with at least one protruding portion protruding from the outer side of the shaft tube.

1: Anti-salt spray structure of fan motor group

11: Silicon steel sheet group

110: Silicon steel sheet

111: upper side

112: lower side

113: Outside

114: Inside

115: Groove

116: binding hole

117: Opening

118: Notch

119: Pole

12: Insulation frame group

121: Upper insulation frame

1211: Upper insulating body

1212: First extension

1213: First convex part

1214: first through hole

1215: Upper guard plate

122: Lower insulation frame

1221: Lower insulating body

1222: Second extension

1223: Second convex part

1224: second through hole

1225: Lower guard plate

1226: Groove

13: Coil set

14: Cladding

15: circuit board

2: Fan

21: fan frame

22: Axle seat

221: Axle Tube

2211: Platform Department

22110: Outside

2212: convex ring

2213: Protrusion

24: Fan wheel

Figure 1 is a schematic cross-sectional view of the fan motor set and the shaft seat of the creation.

Figure 2A is a three-dimensional exploded schematic diagram of the silicon steel sheet group and the upper and lower insulating frames.

FIG. 2B is a perspective exploded schematic view of another alternative implementation of the silicon steel sheet group and the upper and lower insulating frames.

FIG. 3 is a schematic cross-sectional view of another alternative implementation of the fan motor unit and the shaft base.

Figure 4 is a three-dimensional exploded schematic diagram of the fan created.

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings.

The present invention is an anti-salt spray structure 1 for a fan motor set. Please refer to Figures 1, 2A and 4. In this embodiment, the anti-salt spray structure 1 for a fan motor set is applied to a fan 2, such as an axial flow fan. , centrifugal fan, etc., the fan 2 includes a fan frame 21, a fan wheel 24 and a motor group (that is, the anti-salt spray structure 1 of the fan motor group of the present invention), and a shaft seat 22 is arranged in the center of the fan frame 21. A shaft tube 221 protruding from the seat 22 is sleeved with the motor unit. The shaft tube 221 can be a metal shaft tube 221 (such as a copper shaft tube 221) or a plastic shaft tube 221. The fan wheel 24 is accommodated in the fan frame 21 , a shaft center set in the middle of the fan wheel 24 is pivoted with the shaft tube 221 and is covered on the periphery of the motor group, so that a magnetic element is arranged in the fan wheel 24 to induce magnetization with the motor group. In a specific implementation, the fan 2 can also be applied to other types of fans (eg, centrifugal fans).

The anti-salt spray structure 1 of the fan motor group (ie the motor group) includes a silicon steel sheet group 11, an insulating frame group 12 and a coating layer 14. The silicon steel sheet group 11 is composed of a plurality of silicon steel sheets 110 stacked on each other, and is provided with There is an upper side 111 and a lower side 112, an outer side 113 and an inner side 114 are connected between the upper side 111 and the lower side 112, and a bonding hole 116 is formed around the inner side 114, that is, the bonding hole 116 is formed by each silicon steel sheet An opening 117 opened in the center of the 110 is formed by stacking with each other along the longitudinal direction (axial direction). In addition, the combination hole 116 of the silicon steel sheet group 11 of the motor group is provided to be sleeved and fixed with the shaft tube 221 when the fan 2 is assembled, and the combination hole of the silicon steel sheet group 11 during the glue filling and winding operations Available with a winding A winding die rod of a wire machine (not shown in the figure) is sleeved and used, and is provided to be sleeved and used with a middle tube of an upper and lower mold in a glue filling mold (not shown in the figure).

In addition, the inner side 114 of each silicon steel sheet 110 is recessed inwardly (ie, toward the outer side 113 ) and is recessed with at least one notch 118 . , the notches 118 of the plurality of silicon steel sheets 110 are stacked on each other in the longitudinal direction, so that the notches 118 of the inner side 114 of the silicon steel sheet group 11 are stacked vertically to form at least one groove 115 (as shown in FIG. 2A ), the groove 115 ( In this figure, the two grooves 115) have foolproof and positioning functions, which are used to provide positioning for the insertion and positioning of the two convex parts protruding from the outside of the winding die rod of the winding machine (not shown in the figure). In order to facilitate the winding operation, and to provide two protruding bodies for inserting and positioning on the outer side of the middle tube of the lower mold of the glue filling mold, so as to facilitate the glue filling operation.

The insulating frame group 12 includes an upper insulating frame 121 and a lower insulating frame 122. The upper and lower insulating frames 121 and 122 are respectively disposed on the upper side 111 and the lower side 112 of the silicon steel sheet group 11, so that the silicon steel sheet group 11 is Clamped between the upper and lower insulating frames 121, 122, a coil group 13 is radially wound around the upper and lower insulating frames 121, 122 to be sandwiched between the upper and lower insulating frames 121, 122 The set of silicon steel sheets 11 constitutes a stator, and the head and the end of the coil set 13 are respectively fixed on the lower insulating frame 122 with two conductive brackets (not shown in the figure) protruding, and one end of the two conductive brackets penetrates through the lower insulating frame 122. The lower insulating frame 122 is electrically connected to the silicon steel sheet group 11. The other ends of the two conductive supports and the head and the end of the upper coil group 13 are welded to a circuit board 15 and are electrically connected to each other, so that the The upper and lower insulating frames 121 and 122 together with the silicon steel sheet group 11 , the coil group 13 and the circuit board 15 constitute a motor group without glue. The upper and lower insulating frames 121 and 122 in this embodiment are described as being not integrally formed, but not limited thereto, the upper and lower insulating frames 121 and 122 may also be integrally formed.

In addition, the upper insulating frame 121 has an upper insulating body 1211, the upper insulating body 1211 has a first through hole 1214 and a plurality of upper protective plate parts 1215, the first through hole 1214 is aligned with the coupling hole 116, the plurality of The upper guard plate portion 1215 extends radially outward from the outer wall of the upper insulating body 1211, and the plurality of upper guard plate portions 1215 is used to cover the upper side 111 of the plurality of poles 119 corresponding to the silicon steel sheet group 11, and one side of the upper insulating body 1211 protrudes outward with a first extension 1212, the first extension 1212 is along the The periphery of the bottom of the upper insulating body 1211 of the first through hole 1214 protrudes downward to protrude into the bonding hole 116 of the silicon steel sheet group 11 and cover (or cover, shield) the inner side of the silicon steel sheet group 11 Part of 114 (eg, the upper half of inner side 114 is clad) or all (eg, the entire inner side 114 is clad). At least one first protruding portion 1213 protrudes longitudinally from the outer side of the first extending portion 1212 . The first protruding portion 1213 (two first protruding portions 1213 in this figure) protrudes into the concave recess of the silicon steel sheet group 11 . The inside of the groove 115 (such as the upper half of the two grooves 115 ) is covered and bonded (wherein the shape of the first protrusion 1213 matches the shape of the groove 115 ) to seal the groove 115 and allow external moisture Or the salt mist cannot enter the groove 115 , so as to prevent the inner side 114 of the silicon steel sheet group 11 from rusting. Therefore, in the present invention, the first extension 1212 and the first protruding portion 1213 cover and seal the inner side 114 and the groove 115 respectively, which can effectively solve the conventional salt spray from the openings and foolproof holes of the silicon steel sheet group. Corrosion coils, silicon steel sheets, etc. are invaded inside, resulting in rust and rust water spraying out, causing the internal bearing of fan 2 to be stuck.

The lower insulating frame 122 corresponds to the upper insulating frame 121, and has a lower insulating body 1221. The lower insulating body 1221 has a second through hole 1224 and a plurality of lower shield portions 1225. The second through hole 1224 is aligned with the lower insulating frame 1225. Combined with the holes 116 , the plurality of lower shield parts 1225 extend radially outward from the outer wall of the lower insulating body 1221 , and the plurality of lower shield parts 1225 are used to cover the plurality of poles 119 corresponding to the silicon steel sheet group 11 . Underside 112 .

Continuing to refer to Figures 1 and 4, the cladding layer 14 integrally coats the insulating frame set 12, the coil set 13, the silicon steel sheet set 11 and the circuit board 15, and is not covered by the cladding layer 14. The first extension portion 1212 and the inner side 114 are sleeved with the shaft tube 221 , and the outer side of the shaft tube 221 directly or indirectly covers another part of the inner side 114 . In this embodiment, the coating layer 14 is filled with the assembled motor group after placing the assembled motor group in the upper and lower molds of the glue filling mold. After the gel in the glue filling mold is solidified, the coating layer 14 is made only cover The edge frame group 12 , the coil group 13 , the upper, lower sides 111 , 112 and the outer side 113 of the silicon steel sheet group 11 and the circuit board 15 , and the entire inner side 114 of the silicon steel sheet group 11 is not covered by the cladding layer 14 and cover the upper half of the inner side 114 of the silicon steel sheet group 11 by the outer side of the first extension portion 1212 of the upper insulating frame 121 , the inner side of the first extension portion 1212 and the shaft tube 221 The upper half of the outer side is in close contact with each other, and the lower half of the inner side 114 of the silicon steel sheet is directly covered by the lower half of the outer side of the shaft tube 221, so that the silicon steel sheet group 11 The inner side 114 can prevent the intrusion of external salt mist, thereby achieving the effect of preventing rusting. In addition, in the specific implementation, the outer side of the first extension portion 1212 and the lower half of the inner side 114 of the silicon steel sheet group 11 are respectively attached and contacted with the outer side of the shaft tube 221 by using a bit of glue. Apply a colloid to increase the sealing and bonding of the contact position.

The shape of the outer side of the shaft tube 221 is the same as the shape of the inner side 114 of the silicon steel sheet set 11 , that is, the shape of the outer side of the shaft tube 221 is correspondingly changed with the shape of the inner side 114 of the silicon steel sheet set 11 . A platform portion 2211 protrudes from the outside of the shaft tube 221 . The platform portion 2211 is in contact with one end (ie, the free end) of the first extension portion 1212 covering the inner side 114 . The other part (ie, the lower half of the inner side 114 ) is directly covered by the outer side 22110 of the platform portion 2211 of the axle tube 221 , and the outer side 22110 of the platform portion 2211 protrudes outwards corresponding to the position of the groove 115 . At least one protruding portion 2213, the protruding portion 2213 (two protruding portions 2213 in this figure) protrudes into the lower half of the groove 115, and is in contact with the first protruding portion 1213 of the upper insulating frame 121 . And the cladding layer 14 outside the lower side 112 of the silicon steel sheet set 11 abuts against the upper plane of a convex ring 2212 protruding outside the shaft tube 221, and one side plane of the convex ring 2212 is in contact with the lower plane. The cladding layer 14 outside the side surface of the insulating frame body 1221 is in contact with each other, and the convex ring 2212 provides a support function, and can also lift the cladding layer 14 and the outer surface of the lower side 112 of the silicon steel sheet group 11. The sealing between the cladding layers 14 outside the lower insulating body 1221 can improve the effect of preventing salt spray. However, the convex ring 2212 is practically It can also be omitted during implementation, and it is enough to provide protection against salt spray intrusion and rust only by closely covering the lower half of the inner side 114 of the silicon steel sheet group 11 by the outer side 22110 of the platform portion 2211 of the shaft tube 221 . effect.

In another alternative embodiment, please refer to FIGS. 2B and 3, and also refer to FIG. 4. As shown in the figures, the structure and shape of the lower insulating frame 122 are the same as the structure and shape of the upper insulating frame 121, that is, the lower insulating frame 121 has the same structure and shape. A second extending portion 1222 protrudes from one side of the insulating body 1221 , and the second extending portion 1222 protrudes upward along the bottom periphery of the lower insulating body 1221 of the second through hole 1224 to protrude into the silicon steel sheet The bonding hole 116 of the group 11 covers another part of the inner side 114 of the silicon steel sheet group 11 (eg, covers the lower half of the inner side 114 ), and one end (ie, the free end) of the second extension portion 1222 is connected to the first The free end of an extension portion 1212 is abutted and tightly integrated, so as to completely cover the entire inner side 114 of the silicon steel sheet group 11 to prevent the intrusion of salt spray, and the platform portion 2211 of the shaft tube 221 and the upper insulating frame 121 The outer side of the second extension portion 1222 is in contact with each other, and the inner side 114 of the silicon steel sheet set 11 is indirectly covered by the shaft tube 221 and the outer side 22110 of the platform portion 2211 across the first and second extension portions 1212 and 1222 . The outer side of the second extension portion 1222 is longitudinally protruded with at least one second convex portion 1223, and the inner side of the second extension portion 1222 of the second convex portion 1223 is longitudinally recessed with at least one groove 1226. The two protrusions 1223 (the two second protrusions 1223 are shown in this figure) protrude into the lower half of the groove 115 of the silicon steel sheet group 11 , and are combined with the upper part covering the groove 115 . Half of the first protrusions 1213 are connected to seal the entire groove 115 together, so that external moisture or salt mist cannot enter the groove 115, so as to prevent the inner side 114 of the silicon steel sheet group 11 from rusting . The grooves 1226 (two grooves 1226 are shown in this figure) are used for positioning the two convex parts of the winding die rod placed on the winding machine (not shown in the figure) for inserting and positioning, so as to facilitate winding operation, and provide the two convex bodies of the middle pipe placed in the lower mold of the glue pouring mold for inserting and positioning, so as to facilitate the glue pouring operation, the groove 1226 can also provide the fan 2 with the shaft tube corresponding to the fan when it is assembled. The protrusions 2213 of the 221 are fitted together.

According to the design of the anti-salt spray structure 1 of the fan 2 motor set of the present invention, the inner side 114 of the silicon steel sheet set 11 is covered and enclosed by the first extension portion 1212 of the upper insulating frame 121 and the outer side of the shaft tube 221, or It is covered and sealed by the first and second extension parts 1212 and 1222 of the insulating frame group 12 , so that the inner side 114 of the silicon steel sheet group 11 can be effectively prevented from salt spray and rust.

The creation has been described in detail above, but the above is only a preferred embodiment of the creation, and should not limit the scope of implementation of the creation. That is, all equivalent changes and modifications made in accordance with the scope of the application of this creation shall still fall within the scope of the patent of this creation.

1: Anti-salt spray structure of fan motor group

11: Silicon steel sheet group

12: Insulation frame group

121: Upper insulation frame

1211: Upper insulating body

1212: First extension

1213: First convex part

122: Lower insulation frame

1221: Lower insulating body

13: Coil set

14: Cladding

15: circuit board

21: fan frame

22: Axle seat

221: Axle Tube

2211: Platform Department

2212: convex ring

2213: Protrusion

Claims (9)

An anti-salt spray structure for a fan motor group, comprising: a silicon steel sheet group with an upper side and a lower side, an outer side and an inner side are connected between the upper side and the lower side, and the inner side is surrounded to form a combining hole; an insulating frame group, including an upper insulating frame and a lower insulating frame, the upper and lower insulating frames are respectively arranged on the upper side and the lower side of the silicon steel sheet group, a coil group is wound around the upper and lower insulating frames, and is connected with a circuit board For electrical connection, a first extension part protrudes from one side of the upper insulating frame and protrudes into the coupling hole and covers a part or all of the inner side; and a covering layer integrally covers the insulating frame The coil group, the silicon steel sheet group and the circuit board, and the first extension part and the inner side not covered by the cladding layer are sleeved with a shaft tube, and the outer side of the shaft tube is directly or indirectly Cover another part of the inner side. The anti-salt spray structure for a fan motor unit as described in claim 1, wherein a platform portion protrudes from the outside of the shaft tube, and the first extension portion protrudes into the coupling hole and covers the silicon steel sheet set A part of the inner side of the silicon steel sheet group is in contact with the platform part, and the other part of the inner side of the silicon steel sheet group is directly covered by the outer side of the platform part of the shaft tube. The anti-salt spray structure for a fan motor unit as described in claim 1, wherein a second extension portion protrudes from one side of the lower insulating frame and protrudes into the coupling hole and covers the silicon steel sheet set. The other part of the inner side is in contact with the first extension part, so as to completely cover the whole of the inner side of the silicon steel sheet group. The anti-salt spray structure for a fan motor unit as described in claim 3, wherein the outer side of the shaft tube protrudes with a platform portion, the platform portion is in contact with the outer side of the second extension portion, and the The inner side is indirectly covered by the outer side of the platform portion of the shaft tube across the first and second extension portions. The anti-salt spray structure of the fan motor set as described in item 1 of the scope of the patent application, wherein the upper and lower insulating frames are integrally formed or non- integrally formed. The anti-salt spray structure for a fan motor unit as described in claim 1, wherein at least one groove is longitudinally formed on the inner side of the silicon steel sheet set, and at least one first protrusion is protruded from the outer side of the first extension portion. The part protrudes into the groove to cover and combine. The anti-salt spray structure for a fan motor unit as described in claim 3, wherein at least one groove is longitudinally formed on the inner side of the silicon steel sheet set, and at least one longitudinally protruding outer side of the first and second extension parts respectively protrudes The first protruding part and at least one second protruding part, the first and second protruding parts respectively protrude into an upper half part and a lower half part of the groove to cover and combine. The anti-salt spray structure of the fan motor set as described in claim 1, wherein the shape of the inner side of the silicon steel sheet set is the same as the shape of the outer side of the shaft tube. The anti-salt fog structure for a fan motor set as described in claim 7, wherein the second extension portion is longitudinally recessed with at least one groove relative to the inner side of the second convex portion, and the groove is connected to the outer side of the shaft tube. At least one protruding part is protruded and fitted with each other.

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