Fan structure

Abstract

The invention relates to the technical field of refrigeration equipment, through optimal design of the fan structure, the frame body is provided with the stop part, the bearing is axially limited through the gasket and the stop part, and the stop surface of the stop part is lower than the lower end surface of the wrapping part, so that the situation that the bearing axially displaces and rubs a fan blade assembly can be relatively reduced, and the service life of the fan blade assembly is prolonged. And the actuation stability of the fan is relatively guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration equipment, and specifically, to a fan structure. Background Art

[0002] The fan structure of a refrigeration equipment includes a fan blade assembly and a base assembly. The fan blade assembly is connected to the base assembly through a rotating shaft, and after the fan structure is powered on, the fan blade assembly rotates relative to the base assembly to output wind energy outward.

[0003] However, in some cases, the bearing of the traditional fan structure is prone to displacement and then generates friction with the fan blade assembly, resulting in abnormal noise, vibration or rotation obstruction of the fan assembly, affecting the operating stability of the fan. Summary of the Invention

[0004] This application provides a fan structure that can relatively reduce the friction generated between the displaced bearing and the fan blade assembly.

[0005] The present invention provides a fan structure, including a fan blade assembly and a base assembly. The fan blade assembly is provided with a rotating shaft and a stepped portion. The base assembly includes a middle pipe portion, a bearing located inside the middle pipe portion, and a skeleton assembly located on the outer peripheral portion of the middle pipe portion. The rotating shaft is in sliding fit with the bearing;

[0006] The skeleton assembly includes a frame body and an iron core. The frame body and the iron core are integrally formed by injection molding. The frame body includes a stop portion. An abutting portion is further provided on one side of the middle pipe portion away from the stop portion. The stop portion and the abutting portion axially limit the bearing. Along the axial direction of the fan structure, the stop surface of the stop portion is lower than the lower end surface of the wrapping portion.

[0007] Through the optimized design of the fan structure, the frame body is provided with a stop portion. The bearing is axially limited by the abutting portion and the stop portion, and the position of the lower end surface of the stop portion is lower than the position of the lower end surface of the wrapping portion, which can relatively reduce the friction generated by the axial displacement of the bearing and the fan blade assembly, and relatively ensure the operating stability of the fan. Brief Description of the Drawings

[0008] The drawings incorporated in and forming a part of this specification illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0009] Figure 1 is a sectional view of the fan structure in an embodiment of the present application;

[0010] Figure 2 is Figure 1 a schematic structural view of the fan blade assembly in

[0011] Figure 3 is Figure 1 an exploded view of the base assembly in

[0012] Figure 4 a bottom view of the skeleton assembly;

[0013] Figure 5 is Figure 1 a partially enlarged schematic view of

[0014] Explanation of reference numerals:

[0015] 10, blade assembly; 20, base assembly; 1, blade body; 11, blade; 12, mounting cylinder part; 121, wrapping part; 2, rotating shaft; 3, seat body; 4, middle pipe part; 5, skeleton assembly; 51, iron core; 6, bearing; 7, frame body; 71, cylindrical wall part; 8, stop part; 81, connecting plate; 82, extension block; 83, stop surface; 9, installation channel; 91, installation space; 92, first gasket; 93, second gasket. Detailed implementation manners

[0016] To enable those skilled in the art of this technology to better understand the solution of this application, the following further elaborates on this application in conjunction with the accompanying drawings and specific implementation manners. "At least one" in this application includes one and several, and several refers to an indefinite number of multiple.

[0017] Referring to Figures 1 - 5 , the present invention provides a fan structure for a refrigeration device. The refrigeration device is usually a refrigerator, a freezer, etc. The fan structure in this application can be used alone or integrated into the evaporator of the refrigeration device.

[0018] As Figure 1 and Figure 2 shown, the fan structure includes a blade assembly 10 and a base assembly 20. The blade assembly 10 is provided with a rotating shaft 2 and a wrapping part 121. The base assembly 20 includes a seat body 3, a middle pipe part 4 connected to one end of the seat body 3, a bearing 6 located inside the middle pipe part 4, and a skeleton assembly 5 connected to the middle pipe part 4 and located on the outer peripheral part of the middle pipe part 4. The rotating shaft 2 is in sliding fit with the bearing 6. The skeleton assembly 5 includes a frame body 7 and an iron core 51. The frame body 7 and the iron core 51 are integrally formed by injection molding, thereby being able to increase the structural strength of the skeleton assembly 5. At the same time, it can also play a better role in force transmission, avoiding friction and abnormal noise between the frame body 7 and the iron core 51 when the frame body 7 and the iron core 51 are in a split structure during the vibration of the fan structure.

[0019] The frame body 7 includes a stop portion 8. The frame body 7 is sleeved on the outer side wall of the middle pipe portion 4. On the side of the frame body 7 away from the stop portion 8, there is also an abutting portion, and the abutting portion includes a first gasket 92. The stop portion 8 and the first gasket 92 axially limit the bearing 6. Along the axial direction of the fan structure, the stop surface 83 of the stop portion 8 is closer to the bearing 6 than the wrapping portion 121. That is, the stop surface 82 of the stop portion 8 is lower than the lower end surface of the wrapping portion 121. The stop surface 83 of the stop portion 8 extends beyond the end surface (lower end surface) on the same side of the wrapping portion 121, so that the bearing 6 can be prevented from contacting the fan blade assembly axially through the wrapping portion 121.

[0020] In a specific implementation manner, one side of the stop portion 8 in the radial direction of the middle pipe portion 4 is fixed to the frame body 7, and the other side of the stop portion 8 crosses the end surface of the middle pipe portion 4 away from the seat body 3 to extend to the inside of the middle pipe portion 4. A bearing 6 adapted to the rotating shaft 2 is arranged in the middle pipe portion 4, including an axially opposite bottom end surface and top end surface, and the top end surface is located on the side of the bearing 62 away from the seat body 3. The top end surface of the bearing 62 is axially opposite to the stop surface 83 of the stop portion 8, and the bottom end surface of the bearing 62 abuts against the first gasket 92.

[0021] Optionally, define the distance between the stop surface 83 and the top end surface of the bearing 6 as L, where 0 < L ≤ 0.5 mm. Within this range, the force exerted by the axial movement of the bearing 6 on the extension block 82 can be further reduced.

[0022] Specifically, the fan blade assembly 10 includes a fan blade body 1 and a rotating shaft 2 connected to the fan blade body 1. The fan blade body 1 includes a plurality of blades 11 and an installation cylinder portion 12. The plurality of blades 11 are arranged at intervals in the circumferential direction on the outer peripheral wall of the installation cylinder portion 12. The tail end of the rotating shaft 2 is embedded in the installation cylinder portion 12, and the head end can be inserted and assembled with the bearing 6. The installation cylinder portion 12 includes a wrapping portion 121, and the wrapping portion 121 has a stepped structure to wrap the tail end of the rotating shaft 2.

[0023] The rotating shaft 2 can rotate relative to the base assembly 20. While the rotating shaft 2 rotates, it can drive the installation cylinder portion 12 to rotate, and the blades 11 can rotate under the drive of the installation cylinder portion 12 to convey wind energy outwards.

[0024] Continue to refer to Figure 1 , the base assembly 20 includes a seat body 3, a middle pipe portion 4 formed by axially extending from the seat body 3, and a skeleton assembly 5. The middle pipe portion 4 can be integrally formed with the seat body 3, or can be welded or bonded to the seat body 3.

[0025] Please combine Figure 1 and Figure 3, the middle pipe portion 4 can be used to store lubricating oil. The lubricating oil in the middle pipe portion 4 can overflow to the bearing 6 during the operation of the fan structure. A plurality of oil guiding grooves are formed on the outer side wall and the top end surface of the bearing 6 to provide a flow path for the lubricating oil. The skeleton assembly 5 is press-fitted on the outer side of the middle pipe portion 4 in the radial direction. The skeleton assembly 5 cooperates with the middle pipe portion 4 to fix the iron core 51 of the fan structure.

[0026] Combined Figure 1 , Figure 4 and Figure 5 As shown in the structure, the skeleton assembly 5 includes a frame body 7. The frame body 7 includes a cylindrical wall portion 71. The cylindrical wall portion 71 extends along the axial direction of the rotating shaft 2 and is located on the side of the middle pipe portion 4 away from the rotating shaft 2 in the radial direction. Thus, the skeleton assembly 5 can be fixedly connected to the middle pipe portion 4.

[0027] The frame body 7 further includes extension arms 711 connected to the cylindrical wall portion 71. A plurality of extension arms 711 are uniformly arranged along the outer peripheral surface of the cylindrical wall portion 71 to form an assembly with the iron core 51.

[0028] See Figure 5 , the frame body 7 further includes a stop portion 8. The stop portion 8 is provided on the inner ring side of the cylindrical wall portion 71. The stop portion 8 straddles the upper end surface of the middle pipe portion 4, that is, the end surface of the middle pipe portion 4 away from the seat body 3. That is, the stop portion 8 extends from the outer side in the radial direction of the middle pipe portion 4 across the end surface of the middle pipe portion 4 away from the seat body 3 and extends to the inner side in the radial direction of the middle pipe portion 4.

[0029] At this time, at least a part of the stop portion 8 is located above the end surface of the bearing 6 away from the seat body 3. The bearing 6 is located between the stop portion 8 and the seat body 3. At least a part of the projection range of the stop portion 8 in the axial direction coincides with the projection range of the bearing 6 in the axial direction.

[0030] The stop portion 8 includes a stop surface 83 and a connecting plate 81. The stop surface 83 is located in the inner ring portion of the connecting plate 81, and the outer ring portion of the connecting plate 81 is connected to the frame body 7. The lower end surface of the connecting plate abuts against the upper end surface of the middle pipe portion 4. The lower end surface of the connecting plate refers to the end surface of the connecting plate close to the bearing 6.

[0031] Thus, the stop portion 8 can form a stop for the bearing 6 in the axial direction. The stop portion 8 can be integrally formed on the cylindrical wall portion 71 of the skeleton assembly 5 by a casting processing method.

[0032] Since the skeleton assembly 5 is press-fitted outside the middle pipe portion 4. Therefore, the skeleton assembly 5 is in interference fit with the middle pipe portion 4 provided on the base 3. Therefore, even if the bearing 6 undergoes an axial displacement and contacts the stop portion 8, it will not cause the entire skeleton assembly 5 to move relative to the seat body 3.

[0033] Therefore, by providing the stopper 8 on the skeleton assembly 5, the stopper 8 can be connected to the middle tube 4 and limit the bearing 6 in the axial direction. This can prevent the top surface of the bearing 6 from contacting the fan assembly 10 when the bearing 6 moves axially. This prevents the bearing 6 from rubbing against the fan assembly 10 after axial displacement, thereby preventing the fan structure from generating noise, abnormal sound, vibration, and other problems when rotating, and relatively ensures the stability of the fan operation.

[0034] like Figure 5 As shown, in the above embodiment, the first gasket 92 is in clearance fit with the side wall of the middle tube portion 4, one side of the first gasket 92 abuts against the step wall of the middle tube portion 4, and the other side of the first gasket 92 away from the step wall abuts against the bottom end surface of the bearing 6. In this way, the first gasket 92 is sandwiched between the bearing 6 and the step wall of the middle tube portion 4 in the axial direction. The bearing 6 is prevented from directly contacting the middle tube portion 4.

[0035] Optionally, the fan structure further includes a second gasket 93, the second gasket 93 abuts against the bottom wall of the middle tube 4, and the shaft head of the rotating shaft 2 abuts against the second gasket 93. In this embodiment, the first gasket 92 is annular, the shaft head of the rotating shaft 2 passes through the first gasket 92 and is pressed against the bottom wall of the middle tube 4, and the second gasket 93 is located between the shaft head of the rotating shaft 2 and the bottom wall of the middle tube 4, thereby preventing the shaft head from directly contacting the bottom wall of the middle tube 4. The first gasket 92 and / or the second gasket 93 are made of graphite nylon.

[0036] By providing two gaskets, abnormal noises can be avoided during the operation of the fan structure.

[0037] The specific structure of the stopper 8 and the manner in which the stopper 8 cooperates with the bearing 6 in the axial upper limit position are described below with reference to a specific embodiment.

[0038] Embodiment 1

[0039] Combination Figure 4 and Figure 5 In the structure shown, the stopper 8 includes a stopper surface 83, an annular connecting plate 81 extending radially from the cylindrical wall portion 71, and at least one extending block 82 arranged axially perpendicularly to the inner ring portion of the connecting plate 81. The extending block 82 is formed by extending from the inner ring portion along the top end surface close to the bearing 6. The extending block 82 is located on the inner side of the middle tube portion 4, and the stopper surface 83 is located on the extending block 82.

[0040] The inner side of the middle tube portion 4 refers to a side of the middle tube portion 4 close to the bearing 6 in the radial direction, and the outer side of the middle tube portion 4 refers to a side of the middle tube portion 4 far from the bearing 6 .

[0041] In the radial direction, the cylindrical wall portion 71 and the extension block 82 are respectively located on both sides of the connecting plate 81 in the radial direction. At this time, the side walls of the cylindrical wall portion 71, the connecting plate 81, and the extension block 82 close to the bearing 6 enclose Figure 5 an installation space 91 with one end open as shown in Figure 5 . The opening of the installation space 91 faces the side where the bearing 6 is located. In this way, in addition to sleeving the cylindrical wall portion 71 outside the middle pipe portion 4 and achieving an interference fit, a fixed connection is also formed between the end face of the middle pipe portion 4 and the connecting plate 81 by welding, thereby increasing the connection strength between the skeleton assembly 5 and the seat body 3, and further ensuring that the skeleton assembly 5 will not be misaligned relative to the middle pipe portion 4 when the bearing 6 slides axially along the skeleton assembly 5.

[0042] During the assembly process, the skeleton assembly 5 and the middle pipe portion 4 can be tightly fitted by directly pressing the iron core 51 outside the middle pipe portion 4, or the outer wall of the middle pipe portion 4 and the inner wall of the skeleton assembly 5 can be fixedly connected by bonding.

[0043] When the iron core 51 is pressed outside the middle pipe portion 4, sealant is applied to the position where a gap is formed between the frame body 7 and the middle pipe portion 4 to prevent lubricating oil from leaking through the gap.

[0044] Optionally, towards the side close to the top surface, the thickness of the extension block 82 gradually decreases. Thereby, the structural strength of the extension block 82 can be increased, and the situation of deformation of the extension block 82 can be avoided.

[0045] Furthermore, a chamfer is formed at the position where the connecting plate 81 is connected to the extension block 82. Thereby, stress concentration can be avoided, and the structural strength of the stopper portion 8 can be increased.

[0046] In the above embodiment, as Figure 4 shown, a plurality of extension blocks 82 are connected to the inner ring side of the connecting plate 81, and the plurality of extension blocks 82 are evenly distributed along the circumferential direction of the connecting plate 81.

[0047] For example, when there are two extension blocks 82, the two extension blocks 82 are arranged opposite to each other in the radial direction and are evenly distributed in the circumferential direction. The extension block 82 can also be three, four, five or more. Those skilled in the art can select according to their needs. The evenly distributed manner of the plurality of extension blocks 82 along the circumferential direction of the connecting plate 81 makes the force on the connecting plate 81 uniform, effectively improving the structural strength of the skeleton assembly 5.

[0048] Of course, it can be understood that, in addition to the structure in this embodiment, it is also possible to only provide the connecting plate 81 without providing the extension block 82. In this case, the stop surface 83 is located at the inner ring portion of the connecting plate 81. The connecting plate 81 extends radially until it is at least partially located above the end face of the bearing 6 away from the seat body 3 in the radial direction. At this time, the side wall of the inner ring portion of the connecting plate 81 encloses the installation channel 9. Thus, even if the installation cylinder portion 12 is located in the installation channel 9 and the bearing 6 axially moves, it will rub against the lower end face of the connecting plate 81, but it will not touch the installation cylinder portion 12.

[0049] Through Figure 5 It can be seen that the installation space 91 and the installation channel 9 are respectively located on both sides of the extension block 82 in the radial direction, and the end of the middle pipe portion 4 away from the seat body 3 extends into the installation space 91.

[0050] Optionally, in some embodiments, the extension block 82 encloses the installation channel 9.

[0051] The tail end of the rotating shaft 2 is assembled in the installation cylinder portion 12 of the fan blade assembly. The head end of the rotating shaft 2 extends out through the installation channel 9 and is inserted into the bearing 6. At least a part of the installation cylinder portion 12 extends axially into the installation channel 9. Here, the wrapping portion 121 is the part of the installation cylinder portion 12 located in the installation channel 9. Thus, the size of the fan structure in the height direction can be reduced.

[0052] The fan blade assembly 10 further includes an installation cylinder portion 12. The tail end of the rotating shaft 2 is assembled in the installation cylinder portion 12, and the blade 11 is connected to the outer wall of the installation cylinder portion 12.

[0053] The head end of the rotating shaft 2 extends out of the installation cylinder portion 12, extends out through the installation channel 9 and is inserted into the bearing 6. The end of the installation cylinder portion 12 close to the seat body 3 is located in the installation channel 9 in the axial direction. However, in the axial direction, the extension block 82 is closer to the bearing 6 than the installation cylinder portion 12.

[0054] Specifically, the root of the rotating shaft 2 is built into the installation cylinder portion 12. The rest of the rotating shaft 2 sequentially passes through the installation channel 9 and the bearing 6 and is axially limited and cooperated with the seat body 3. At least a part of the installation cylinder portion 12 is located in the installation channel 9. For example, the end of the installation cylinder portion 12 away from the blade 11 extends into the installation channel 9.

[0055] In the axial direction, the portion of the stop portion 8 that is in stop cooperation with the bearing 6 is located between the installation cylinder portion 12 and the bearing 6. Thus, even if the installation cylinder portion 12 extends into the installation channel 9, the stop portion 8 still forms an axial stop with the bearing 6 in the axial direction, and it is still possible to prevent the bearing 6 from contacting the installation cylinder portion 12 after axially moving. At the same time, the way the installation cylinder portion 12 extends into the installation channel 9 can effectively reduce the size of the fan structure in the axial direction and reduce the space occupied by the fan structure.

[0056] Axially, one end of the extension block 82 away from the connecting plate 81 extends axially toward the side where the bearing 6 is located until the stop surface 83 of the extension block 82 is closer to the end face of the bearing 6 away from the seat body 3 than the end face of the mounting cylinder portion 12 of the fan blade assembly 10 extending into the mounting channel 9.

[0057] In this way, when the bearing 6 undergoes axial movement, the bearing 6 does not come into contact with the end face of the mounting cylinder portion 12 of the fan blade assembly 10, but comes into contact with the end face of the extension block 82. The contact force is transmitted through the extension block 82 to the cylindrical wall portion 71 and then continues to be transmitted to the entire skeleton assembly 5. Then, it continues to be transmitted to the entire seat body 3 through the connection position between the skeleton assembly 5 and the middle tube portion 4. In this way, the force generated by the sliding of the bearing 6 will be gradually decomposed in the base assembly 20. In this way, even if the bearing 6 rubs against the extension block 82, the abnormal noise or vibration generated will be greatly reduced. At the same time, since the bearing 6 no longer contacts the fan blade assembly 10, the situation where the rotation of the fan blade assembly 10 is blocked can be avoided.

[0058] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A fan structure, characterized in that, It comprises a fan blade assembly and a base assembly, wherein the fan blade assembly is provided with a rotating shaft and a wrapping portion, the base assembly comprises a middle tube portion, a bearing located in the middle tube portion, and a skeleton assembly located at the outer periphery of the middle tube portion, and the rotating shaft is slidably matched with the bearing; The skeleton assembly includes a frame body and an iron core, the frame body and the iron core are formed into an integral structure by injection molding, the frame body includes a stop portion, and a supporting portion is further provided on the side of the middle tube portion away from the stop portion, the stop portion and the supporting portion axially limit the bearing, and along the axial direction of the fan structure, the stop surface of the stop portion is lower than the lower end surface of the wrapping portion.

2. The fan structure according to claim 1, characterized in that, The stopper comprises: a stop surface for cooperating with the bearing stop; A connecting plate is arranged radially, an outer ring portion of the connecting plate is connected to the frame body, an inner ring portion of the connecting plate is provided with the stop surface, and the stop surface is axially opposite to the bearing.

3. The blower structure according to claim 2, characterized in that, The bearing comprises a top end surface and a bottom end surface which are opposite to each other in the axial direction, wherein the top end surface is opposite to the stop surface, and the bottom end surface is against the abutting portion.

4. The blower structure according to claim 3, characterized in that, The distance between the stop surface and the top end surface is defined as L, wherein 0<L≤0.5mm.

5. The blower structure according to claim 2, characterized in that, The stopper also includes an extension block, which is axially extended downward from the connecting plate, and the stopper surface is located on the extension block.

6. The blower structure according to claim 5, characterized in that, The extension blocks enclose a mounting channel; The fan blade assembly also includes a mounting cylinder, the outer wall of which is connected to a plurality of blades, the tail end of the rotating shaft is mounted in the mounting cylinder, the head end of the rotating shaft extends out through the mounting channel and is inserted into the bearing, and at least a portion of the mounting cylinder extends axially into the mounting channel.

7. The fan structure according to claim 2, characterized in that, The lower end surface of the connecting plate abuts against the upper end surface of the middle tube portion.

8. The blower structure according to any one of claims 1-7, characterized in that, The abutting portion includes a first gasket, the first gasket is gap-matched with the side wall of the middle tube portion, one side of the first gasket abuts against the step wall of the middle tube portion, and the other side of the first gasket facing away from the step wall abuts against the bottom end surface of the bearing.

9. The blower structure according to claim 8, wherein, It also includes a second gasket, which abuts against the bottom wall of the middle tube portion, and the shaft head of the rotating shaft abuts against the second gasket.

10. The fan structure according to claim 9, characterized in that, The first gasket and / or the second gasket are made of graphite nylon.

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