TW201839273A - Fan central barrel coupling structure - Google Patents

Abstract

A fan central barrel coupling structure includes a base and a central barrel. The base has a first section and a second section that together define an upward tapered receiving recess below the base. The central barrel is externally provided on around a bottom end with a first and a second protruded section and an engagement groove defined between the first and second protruded sections. The second protruded section has an interference pressing surface defined on an outermost peripheral surface thereof. The central barrel is axially extended through the base, such that the second protruded section is axially press-fitted into the tapered receiving recess and the interference pressing surface is radially outward forced against the tapered receiving recess. In the meantime, the second section of the base is fitted in the engagement groove and clamped in place by between the first protruded section and the second protruded section.

Description

Fan middle tube combined structure

The invention relates to the field of a fan, in particular to a combination structure of a middle tube and a fan frame of a fan.

The current cooling fan is mainly used for forced guiding airflow cooling where heat is required, and the cooling fan is mainly caused by induction excitation between the rotor and the stator, and then the rotor is rotated to guide the airflow. The rotor of the cooling fan is mainly composed of a shaft center and a fan wheel valley having a plurality of blades, and the stator is disposed outside the shaft barrel of the fan frame and corresponding to the fan wheel valley. The shaft cylinder is a structural body integrally formed by the fan frame body, and a cooling fan using a copper shaft tube is used, and the copper shaft cylinder is riveted to the base of the fan frame body by riveting, but this The structure is easy to be damaged due to the structure of the fan caused by the riveting process, and the riveting is not completely easy to cause looseness; and the riveting work mainly relies on the pressure to force the copper shaft tube into the base of the fan frame body, The concentricity of the copper shaft tube and the base of the fan frame body is also difficult to control, and noise is easily generated if it is easily loosened after riveting. Therefore, how to solve the above problems and deficiencies, that is, the inventors of this case and the relevant manufacturers engaged in this industry are eager to study the direction of improvement.

Accordingly, in order to effectively solve the above problems, an object of the present invention is to provide a fan-in-tube coupling structure for improving the assembly precision of a tube in a fan. Another object of the present invention is to provide an increase in the heat conduction area of the tube and the base in the fan and to improve the thermal conductivity between the middle tube and the base. In order to achieve the above object, the present invention provides a fan-in-tube coupling structure, comprising: a base and a middle tube axially coupled to the base, the base having a bottom portion formed with a first portion and a second portion, the first portion and The second portion defines a tapered receiving groove; the middle tube has a first convex portion and a second convex portion, and an insertion groove is located between the first convex portion and the second convex portion, the second convex portion Inserting the tapered receiving groove into the tapered receiving groove and having an interference pressing surface defined on an outermost side of the second convex portion and radially pressing the tapered receiving groove, the second portion of the base is coupled to The first convex portion and the second convex portion are vertically clamped and fixed in the insertion groove. The present invention further provides a fan-in-tube coupling structure, comprising: a base having a bottom portion formed with a first portion and a second portion, the first portion protruding obliquely along an axial direction of the base, The second portion is connected to the first portion and has a free end extending in a horizontal direction and has a lower joint surface, the free end defining a through hole, the lower joint surface is provided with a squeeze groove, wherein the first portion and the second portion Partially defining a tapered receiving groove communicating with the through hole, the tapered receiving groove having an inner inclined side; a middle tube having a top end and a bottom end and an accommodating space, the top end having an opening communicating with the accommodating space, The bottom end is provided with a first convex portion and a second convex portion under the first convex portion, the first convex portion and the second convex portion are disposed on an outer side surface of the middle tube, and an insertion groove is located at the first portion a convex portion and the second convex portion, and the second convex portion has an upper bonding surface and an interference pressing surface defined on an outermost side of the second convex portion, wherein a top end of the middle tube is penetrated a through hole of the base, the second convex portion along the bottom The axial compression is inserted into the tapered receiving groove, the interference pressing surface radially presses the inner inclined side of the tapered receiving groove, and the free end of the second portion is incorporated in the embedded groove and is A convex portion and the second convex portion are vertically clamped and fixed. In one embodiment, the upper bonding surface of the second protrusion contacts the lower bonding surface of the second portion of the base, and the upper bonding surface of the second protrusion forms a pressing protrusion to cooperate with the second portion of the base The extrusion groove of the lower joint surface. In an embodiment, the first protrusion has a second inclined portion that contacts the second portion of the base. In one embodiment, the free end of the second portion of the base has an upper inclined guide angle corresponding to the lower inclined surface of the first projection. In an embodiment, the base is disposed within a fan housing.

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings. 1 is a perspective exploded view of the present invention; FIG. 2 is a schematic cross-sectional view of the present invention; FIG. 3 is a schematic cross-sectional view of the present invention; As shown in the figure, the present invention includes a base 11 and a middle tube 21. The base 11 has a bottom portion 111. A first portion 112 and a second portion 113 are formed near the center of the bottom portion 111. The first portion 112 is opposite. The bottom portion 111 stands and protrudes obliquely along an axial direction A of the base 11. The second portion 113 is connected to the first portion 112 and extends along a horizontal direction with a free end 1131. The free end 1131 defines a through hole. The first portion 112 and the second portion 113 further define a conical row receiving groove 115 below the second portion 113 and communicate with the through hole 114 at an approximate central position of the bottom portion 111 of the base 11. Furthermore, the second portion 113 has a lower joint surface 1132 facing the tapered receiving groove 115, and the lower joint surface 1132 is provided with an extruding groove 1133. One side of the first portion 112 facing the tapered receiving groove 115 is an inner inclined side 1151 of the tapered receiving groove 115. As shown in the figure, the tapered receiving groove 115 is arranged to be narrower and wider than the bottom, that is, the area of the tapered receiving groove 115 on the side close to the second portion 113 (the top side of the drawing) is smaller than the opposite. The area of the two sides 113 side (the bottom side of the drawing). The middle tube 21 has a top end 211 and a bottom end 212 and an accommodating space 213. The top end 211 has an opening 2111 communicating with the accommodating space 213. The bottom end 212 is provided with a first convex portion 214 and a second convex portion. The first convex portion 214 and the second convex portion 215 are disposed on an outer side surface 216 of the middle tube 21, and an insertion groove 217 is located at the first convex portion 214 and the second portion. Between the convex portions 215, the second convex portion 215 has an upper bonding surface 2151 and an interference pressing surface 2152 defined at the outermost side of the second convex portion 215. When assembling, the middle tube 21 and the base are riveted by hydraulic pressure or punching, in particular, the top end 211 of the middle tube 21 is penetrated through the through hole 114 of the base 11, and the second convex portion 215 is along the potential The axial direction A of the base 11 is pressed into the tapered receiving groove 115, and the interference pressing surface 2152 radially presses the inner inclined side 1151 of the tapered receiving groove 115 until the second convex portion 215 The upper bonding surface 2151 contacts the lower bonding surface 1132 of the second portion 113 of the base 11, and the upper bonding surface 2151 of the second protrusion 215 forms a pressing protrusion 2153 that fits under the second portion 113 of the base 11. The first end portion 214 and the second protrusion portion 215 are clamped and fixed by the first protrusion portion 214 and the second protrusion portion 215 in the insertion groove 217. In particular, the interference pressing surface 2152 of the second convex portion 215 is an interference fit (ie, tightly fitted) to the tapered receiving groove 115, and is axially pressed along the inner inclined side of the tapered receiving groove 115, so that the The second protrusion 215 forms the extrusion protrusion 2153 to engage the extrusion groove 1133. Furthermore, the first convex portion 214 has a lower inclined surface 2141 contacting the second portion 113 of the base 11, and the free end 1131 of the second portion 113 of the base 11 has an upper inclined lead angle 11311 corresponding to the first convex portion. The lower inclined surface 2141 of the portion 214 is thereby detached from the free end 1131 incorporated in the fitting groove 217, and then the middle tube 21 is pulled out from the through hole 114 of the base 11. Please refer to Figures 5 and 6 for the implementation of the invention in the fan frame. As shown in the figure, the base 11 and the middle tube 21 are disposed in a fan frame 31. The periphery of the base 11 is coupled to the center of the fan frame 31 by a plurality of radial coupling ribs for carrying a wheel. 32. The accommodating space 213 of the middle tube 21 is provided with at least one bearing 33 being inserted by a shaft 321 of the fan wheel 32. The outer side of the middle tube 21 is sleeved to a certain subset 34 for driving the fan wheel 32 when energized. Running. In summary, the present invention is coupled to the insertion groove 217 of the middle tube 21 by the free end 1131 of the second portion 113 of the base 11, and is supported by the first convex portion 214 and the second convex portion 215 of the middle tube 21 The second portion 113 of the base 11 is clamped, and a pressing protrusion 2153 is formed to cooperate with the extruding groove 1133 to generate an axial fixed force to the middle tube 21, and the second convex portion 215 The interference pressing surface 2152 is interference-fitted with the tapered receiving groove 115 to generate a radial pressing force for the middle tube 21 to improve the assembly precision of the base 11 and the middle tube 21, and to pass through the second The upper bonding surface 2151 of the convex portion 215 contacting the lower bonding surface 1132 of the second portion 113 of the base 11 increases the heat conduction area of the middle tube 21 and the base 11, and improves the thermal conductivity therebetween. The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

11‧‧‧Base

111‧‧‧ bottom

112‧‧‧Part I

113‧‧‧Part II

1131‧‧‧Free end

1132‧‧‧Under joint surface

1133‧‧‧Squeezing groove

11311‧‧‧Upper inclined lead angle

114‧‧‧through hole

115‧‧‧Cone storage trough

1151‧‧‧Inside inclined side

21‧‧‧中管

211‧‧‧Top

2111‧‧‧ openings

212‧‧‧ bottom

213‧‧‧ accommodating space

214‧‧‧First convex

2141‧‧‧Under inclined surface

215‧‧‧second convex

2151‧‧‧ Upper joint surface

2152‧‧‧Overcoming extrusion surface

2153‧‧‧Squeezing convex body

216‧‧‧ outside side

217‧‧‧ embedded slot

A‧‧‧Axial

31‧‧‧Fan frame

32‧‧‧fan wheel

33‧‧‧ bearing

321‧‧‧ shaft

34‧‧‧stator group

The following drawings are intended to provide a more complete understanding of the invention, and are in the The specific embodiments of the present invention are described in detail by reference to the specific embodiments herein, 1 is a perspective exploded view of the present invention; FIG. 2 is a schematic cross-sectional view of the present invention; FIG. 3 is a schematic cross-sectional view of the present invention; FIG. 4 is a schematic cross-sectional view of the present invention; FIG. 6 is a schematic cross-sectional view showing the inside of a fan frame according to the present invention.

Claims (6)

A fan-in-tube coupling structure includes: a base and a middle tube axially coupled to the base, the base having a bottom portion formed with a first portion and a second portion, the first portion and the second portion defining a tapered receiving portion The middle tube has a first convex portion and a second convex portion and an insertion groove is located between the first convex portion and the second convex portion, and the second convex portion is axially pressed into the cone Forming a receiving groove and having an interference pressing surface defined on an outermost side of the second convex portion and radially pressing the tapered receiving groove, the second portion of the base being coupled in the embedded groove by the first convex The portion and the second convex portion are clamped and fixed up and down. A fan-in-tube coupling structure includes: a base having a bottom portion formed with a first portion and a second portion, the first portion standing relative to the bottom portion and projecting obliquely along an axial direction of the base, the The second portion is connected to the first portion and has a free end extending in a horizontal direction and has a lower joint surface, the free end defining a through hole, the lower joint surface is provided with a squeeze groove, wherein the first portion and the second portion Partially defining a tapered receiving groove communicating with the through hole, the tapered receiving groove having an inner inclined side; a middle tube having a top end and a bottom end and an accommodating space, the top end having an opening communicating with the accommodating space, The bottom end is provided with a first convex portion and a second convex portion under the first convex portion, the first convex portion and the second convex portion are disposed on an outer side surface of the middle tube, and an insertion groove is located at the first portion a convex portion and the second convex portion, and the second convex portion has an upper bonding surface and an interference pressing surface defined on an outermost side of the second convex portion, wherein a top end of the middle tube is penetrated a through hole of the base, the second convex portion is along the The axial pressing of the seat is inserted into the tapered receiving groove, the interference pressing surface radially presses the inner inclined side of the tapered receiving groove, and the free end of the second portion is incorporated in the embedded groove and is The first convex portion and the second convex portion are vertically clamped and fixed. The fan-in-tube coupling structure of the second aspect of the invention, wherein the upper bonding surface of the second protrusion contacts the lower bonding surface of the second portion of the base, and the upper bonding surface of the second protrusion forms a The extrusion projection engages the extrusion groove of the lower joint surface of the second portion of the base. The fan middle tube joint structure according to claim 2, wherein the first convex portion has a lower inclined surface contacting the second portion of the base. The fan-in-tube coupling structure according to claim 4, wherein the free end of the second portion of the base has an upper inclined guide angle corresponding to the lower inclined surface of the first protrusion. The fan-in-tube coupling structure according to claim 2, wherein the base and the middle tube are disposed in a fan frame.