A connection structure based on a shell support unit

Abstract

This application relates to the field of housing injection molding, and in particular to a connection structure based on a housing receiving unit, including an insertion part. The internal cavity of the insertion part is used for the installation of a power transmission mechanism. An injection channel is provided on the insertion part for injection material to flow into the internal cavity. The receiving unit, as an insert, is placed into the housing mold and injection molded together with the housing. After the injection material enters the housing mold, it forms a support platform embedded in the insertion part through the injection channel. A through hole is formed in the center of the support platform through the housing mold. The support platform and the housing are integrally formed, so that the receiving unit and the housing fit together to complete the assembly of the receiving unit and the housing. The first platform of the support platform provides a connection carrier for the installation of the power transmission mechanism, and the second platform of the support platform provides support for the installation of the drive mechanism. This achieves the effects of reducing the production cost of the receiving unit, simplifying the processing steps, and improving the connection quality involving the receiving unit.

Description

Technical Field

[0001] This application relates to the field of housing injection molding, and in particular to a connection structure based on a housing receiving unit. Background Technology

[0002] The cavity inside the receiving unit is used for the installation of the power transmission mechanism, while the cavity outside the receiving unit is used for the support of the drive mechanism. Therefore, the receiving unit plays a crucial role in the assembly of the fan.

[0003] Existing receiving units are mostly mass-produced using CNC lathes. Because the cavity of the receiving unit needs to provide a platform for the installation of the power transmission mechanism, countersunk holes need to be machined at both ends of the receiving unit during machining. The diameter of the countersunk holes is larger than the diameter of the center hole, thus forming two upper and lower clamping platforms inside the cavity of the receiving unit. In addition, because the cavity of the receiving unit also needs to provide support for the drive mechanism, steps for support need to be machined on the outer wall of the receiving unit.

[0004] In summary, when manufacturing the receiving unit using machining methods, the following machining dimensions have high requirements:

[0005] 1. The depth, concentricity, and perpendicularity of the countersunk holes in the receiving unit cavity must meet the requirements.

[0006] If the depth of the countersunk holes at both ends does not meet the required dimensions, it will cause the overall position of the locking platform in the cavity to shift upward or downward, or the thickness between the two locking platforms to be too thick or too thin. If the depth of the countersunk holes at both ends is too deep or completely through, it will cause the thickness between the two locking platforms to be too thin or even the locking platforms to disappear, making it impossible to install the power transmission mechanism or to meet the installation standards.

[0007] If the centers of the two countersunk holes are not set concentrically, the power transmission mechanism cannot effectively transmit the force.

[0008] If the countersunk holes at both ends are not axially perpendicular, the power transmission mechanism cannot be installed.

[0009] 2. The width and height of the steps on the outer wall of the receiving unit must meet the requirements:

[0010] If the step is too narrow, it cannot support the drive mechanism.

[0011] If the height of the steps is too high or too low, it will affect the installation position of the drive mechanism, thus affecting subsequent work.

[0012] Furthermore, the existing receiving units are processed using metal materials, such as stainless steel. Since different cutting tools are used for machining sinks and steps, additional cutting tools are required. Tool wear can affect machining quality. While machining and raw material costs remain high, tool wear further increases the processing cost of the receiving unit, to approximately 1.2 yuan per piece. The processing time is also relatively long, approximately 10 minutes per piece.

[0013] After machining, the receiving unit needs to be assembled with the housing. In the existing technology, most of them adopt the hot pressing assembly method, that is, the receiving unit is heated and then pressed into the connecting hole of the housing, so that the plastic on the hole wall melts and wraps the receiving unit to complete the assembly. In order to strengthen the connection between the receiving unit and the housing, knurled texture is also provided on its outer wall.

[0014] The entire process from production to assembly of the unit is too complicated, and the complete process can be roughly divided into three steps:

[0015] 1. Machining of the receiving unit:

[0016] (1) Step processing is required on the outer wall of the receiving unit.

[0017] (2) Two countersunk holes need to be machined in the cavity of the receiving unit.

[0018] (3) The surface of the connection between the outer wall of the receiving unit needs to be knurled.

[0019] 2. The shell is obtained by injection molding.

[0020] 3. After heating the receiving unit, press it into the connecting hole of the housing to complete the assembly.

[0021] However, the receiving unit is only connected to the housing by the knurled surface, and the contact area with the housing is small. In addition, the receiving unit is cylindrical. If the receiving unit is subjected to axial force after assembly, it will fall off.

[0022] If the receiving unit cannot be pressed down to the bottom of the housing during assembly, a step will be created at the connection point, which will not only affect the appearance but also the subsequent use.

[0023] Furthermore, stainless steel, iron, and other metals are rigid materials. At the joints of the shell, cracks may occur at the joints due to temperature, external forces, or other external factors, or the support unit may come loose, which will reduce product quality. Summary of the Invention

[0024] In order to reduce the production cost of the receiving unit, simplify the processing procedures, and improve the connection quality of the receiving unit, this application provides a connection structure based on the shell receiving unit.

[0025] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0026] A connection structure based on a housing receiving unit is disclosed. The receiving unit is injection molded from plastic and includes an insertion part. The internal cavity of the insertion part is used for the installation of a power transmission mechanism. An injection channel is provided on the insertion part for the injection material to flow into the internal cavity. The receiving unit is inserted into the housing mold as an insert and injection molded together with the housing. After the injection material enters the housing mold, it forms a support platform embedded in the insertion part through the injection channel. A through hole is formed in the center of the support platform through the housing mold. The support platform is integrally formed with the housing, so that the receiving unit and the housing fit together to complete the assembly of the receiving unit and the housing.

[0027] The first platform of the support base provides a connecting carrier for the installation of the power transmission mechanism, while the second platform provides support for the installation of the drive mechanism. The plastic receiving unit reduces production costs and, through injection molding, enables mass production, shortening production time. The injection channel allows the support base to be molded simultaneously with the housing during injection molding, eliminating the need for processing the support base during the receiving unit's production stage. Optimizing the processing technology and procedures of the receiving unit, the support base, integrally molded with the housing, fits seamlessly with the receiving unit, completing the assembly of the receiving unit and the housing, thus omitting assembly steps.

[0028] Furthermore, the lower end of the insertion part extends outward to form a snap-fit ​​part, and the injection molding material covers the snap-fit ​​part to increase the contact area and anchoring depth with the injection molding material.

[0029] The molding thickness of both the first and second platforms is greater than the molding thickness within the injection channel. The connection between the housing and the receiving unit is reinforced to prevent the receiving unit from detaching.

[0030] Furthermore, multiple injection channels are equidistantly arranged around the insertion part, and the positions of these multiple injection channels in the insertion part match the positions on the support platform where injection molding is to be performed. This ensures that the injection material flows evenly into the cavity of the insertion part.

[0031] Furthermore, the snap-fit ​​part is perpendicular to the insertion part, and both the upper and lower end faces of the snap-fit ​​part are planes. A transition section is provided at the junction of the lower end face of the snap-fit ​​part and the internal cavity of the insertion part.

[0032] A bevel is provided around the opening at the upper end of the insertion part to connect with the internal cavity. The transition section is arc-shaped, which makes the overall appearance more aesthetically pleasing and facilitates the installation of the B bearing.

[0033] Furthermore, a reinforcing portion is injection molded around the outer wall of the receiving unit on the housing. The reinforcing portion extends outward from top to bottom, and the outer wall of the second platform covers the outer wall of the insertion portion and is injection molded together with the reinforcing portion.

[0034] Furthermore, the power transmission mechanism includes a rotating shaft that is rotatable within the first platform via a support assembly;

[0035] The retaining sleeve is injection molded together with the impeller as an insert, and the shaft is riveted to the retaining sleeve. This strengthens the connection between the impeller and the shaft.

[0036] Furthermore, the first platform divides the internal chamber of the insertion part into an upper chamber and a lower chamber, and the support assembly is sleeved on the rotating shaft. The support assembly includes bearing A located in the upper chamber and bearing B located in the lower chamber.

[0037] A clamping element is provided at the lower end of the rotating shaft, and an elastic component is sleeved on the rotating shaft. The elastic component acts between the impeller and bearing A to apply axial force.

[0038] Furthermore, the drive mechanism includes a control board and a stator that generates a magnetic field;

[0039] The stator includes an insulating frame and a stator core. Windings are wound on the teeth of the insulating frame, and the second platform supports the yoke of the stator core.

[0040] A driven mechanism is provided on the inner wall of the impeller, which includes a magnetic ring that cooperates with the stator core.

[0041] Furthermore, an air supply plate is provided at the air supply end of the impeller, and mounting grooves corresponding to the blade path are arranged around the air supply plate.

[0042] In summary, this application has the following technical effects:

[0043] 1. By adopting the above solution, the traditional processing technology of the receiving unit has been changed. By using injection molding, the product quality is consistent. While ensuring product quality, mass production is achieved, which greatly shortens the production time. Furthermore, through the improvement of the processing technology, the metal receiving unit has been changed to plastic material, which reduces the production cost from raw materials and processing technology. The reduced cost is approximately 0.4 yuan / piece.

[0044] This application does not simply replace the materials, but improves both the structure and the processes involved. The processing accuracy requirements for the receiving unit are lower than those for machining, which improves its adaptability. Furthermore, it does not require high technical skills from the operators, thus reducing personnel costs.

[0045] 2. An injection channel is provided on the insertion part. Through cooperation with the injection mold of the shell, the injection material can enter the cavity of the insertion part through the injection channel, so that the shell and the support platform are injection molded together. This eliminates the processing steps of the snap-fit ​​platform on the traditional receiving unit. Since the support platform and the shell are embedded with the receiving unit during the molding process, the subsequent assembly process of the receiving unit is omitted, and the installation of the shell and the receiving unit is directly completed.

[0046] The snap-fit ​​part increases the contact area with the injection molding material, and the reinforcing part of the shell is injection molded at the corner of the insertion part and the snap-fit ​​part to strengthen the connection strength at the connection point. There are 3 fitting points between the receiving unit and the shell, namely, the support platform, the outer wall of the insertion part and the snap-fit ​​part, which can further prevent the receiving unit from falling out. The lower end of the snap-fit ​​part is flat, which can ensure the flatness of the bottom of the shell during the injection molding of the shell.

[0047] 3. The support platform of this application incorporates the functions that can only be achieved by two structures in the metal receiving unit: the two locking platforms in the metal receiving unit support the power transmission mechanism, and the steps on the outer wall of the receiving unit support the drive mechanism. This application achieves the above two functions by injection molding only one support platform.

[0048] 4. Because the thickness of the molding material on both the inner and outer sides of the injection channel is greater than the thickness inside the injection channel, the connection with the insertion part is strengthened, and the injection molding process is also optimized.

[0049] 5. The first platform of the support base provides a connecting carrier for the power transmission mechanism, eliminating the need for two separate clamping platforms. Furthermore, the increased contact area between the first platform and the support assembly results in more even stress distribution compared to clamping platforms. The elastic component applies an upward thrust to the impeller, while the clamping component prevents the shaft from dislodging. Together, they define the relative axial position of the shaft and bearing. The fixed sleeve, as an insert, is injection-molded with the impeller. The end of the shaft is riveted to the fixed sleeve, reinforcing the connection between the impeller and the shaft. The impeller and the air delivery plate are injection-molded separately and then connected by mounting grooves, ensuring the impeller's functionality and reducing production complexity.

[0050] The second platform of the support table can support the yoke of the stator core. The housing has an upwardly protruding positioning platform that can support the control board. Through two-point positioning, the drive mechanism can be quickly installed. Attached Figure Description

[0051] Figure 1 This is a top view of this application;

[0052] Figure 2 This is a cross-sectional view (AA) of this application;

[0053] Figure 3 This is a detailed drawing of Part A of this application;

[0054] Figure 4 This is a schematic diagram of the receiving unit of this application;

[0055] Figure 5 This is a schematic diagram of the transition section of the unit to which this application is undertaken;

[0056] Figure 6 This is a detailed drawing of Part B of this application;

[0057] Figure 7 This is a schematic diagram of the power transmission mechanism of this application;

[0058] Figure 8 This is a top view of the drive mechanism of this application;

[0059] Figure 9 This is a BB cross-sectional view of this application;

[0060] Figure 10 This is a schematic diagram of the prior art in this application.

[0061] In the picture:

[0062] 1. Insertion section; 11. Injection channel; 12. Bevel;

[0063] 2. Connecting part; 21. Transition section;

[0064] 3. Shell; 31. Support platform; 311. First platform; 312. Second platform;

[0065] 32. Connecting seat; 321. Reinforcing rib; 33. Positioning platform; 34. Leaving groove;

[0066] 4. Shaft; 41. Bearing A; 411. Elastic component; 42. Bearing B; 421. Clamping component;

[0067] 5. Control panel; 51. Positioning hole; 52. Pressing hole;

[0068] 6. Insulating frame; 61. Winding; 62. Connecting arm; 7. Stator core; 71. Yoke; 72. Tooth crown; 8. Magnetic ring;

[0069] 9. Impeller; 91. Connecting bracket; 92. Fixing sleeve; 10. Air supply plate; 101. Mounting slot;

[0070] 1101, Card-connecting platform; 1102, Step. Detailed Implementation

[0071] The present application will be further described in detail below with reference to the accompanying drawings.

[0072] Reference Figures 1 to 10As shown, a connection structure based on a housing receiving unit is provided. The receiving unit is made of plastic injection molding and includes an insertion part 1. The internal cavity of the insertion part 1 is used for the installation of a power transmission mechanism. An injection channel 11 is provided on the insertion part 1 to allow injection material to flow into the internal cavity. The receiving unit is placed into the housing mold as an insert and is injection molded together with the housing 3. After the injection material enters the housing mold, it forms a support platform 31 embedded in the insertion part 1 through the injection channel 11. A through hole is formed at the center of the support platform 31 through the housing mold. The support platform 31 and the housing 3 are integrally formed, so that the receiving unit and the housing 3 are fitted together to complete the assembly of the receiving unit and the housing 3.

[0073] The first platform 311 of the support platform 31 provides a connecting carrier for the installation of the power transmission mechanism, and the second platform 312 of the support platform 31 provides support for the installation of the drive mechanism.

[0074] Multiple injection channels 11 are equidistantly arranged around the insertion part 1. The positions of the multiple injection channels 11 in the insertion part 1 match the positions of the support platform 31 where injection molding is required. A total of four injection channels 11 are provided.

[0075] The shape of the injection channel 11 is not limited to a circle, rectangle or other polygons. In this embodiment, the injection channel 11 adopts a circular hole. Compared with other shapes, the circular hole has no corners and has less flow resistance, which allows the injection material to flow evenly, allows cooling to proceed at a uniform rate, does not generate internal stress, and makes the force on the support platform 31 after molding evenly distributed.

[0076] The receiving unit also includes a snap-fit ​​portion 2 extending outward from the lower end of the insertion portion 1. The snap-fit ​​portion 2 is perpendicular to the insertion portion 1, and both the upper and lower surfaces of the snap-fit ​​portion 2 are flat to increase the contact area and anchoring depth with the injection molding material, strengthen the connection between the receiving unit and the housing 3, and keep the bottom surface of the housing 3 flat and aesthetically pleasing. A curved transition section 21 is provided at the junction of the lower surface of the snap-fit ​​portion 2 and the internal cavity of the insertion portion 1 to facilitate the installation of the subsequent power transmission mechanism. A bevel 12 is provided around the opening at the upper end of the insertion portion 1 to connect with the internal cavity of the insertion portion.

[0077] During injection molding, the first platform 311 and the second platform 312 located on the inner and outer sides of the injection channel 11 have a molding thickness greater than that inside the injection channel 11, so as to distribute stress evenly, strengthen the connection, and avoid breakage at the connection.

[0078] The power transmission mechanism includes a rotating shaft 4, which is rotatable within the first platform 311 via a support assembly. A fixed sleeve 92 is injection molded together with the impeller 9 as an insert. The surface of the fixed sleeve 92 is provided with raised textures to reinforce the connection with the impeller 9. The upper end of the rotating shaft 4 is riveted to the fixed sleeve 92 to realize the connection between the rotating shaft 4 and the impeller 9.

[0079] The first platform 311 of the support platform 31 divides the inner chamber of the insertion part 1 into an upper chamber and a lower chamber. The rotating shaft 4 is located in the through-hole of the first platform 311, and the support assembly is sleeved on the rotating shaft 4. The support assembly includes an A bearing 41 located in the upper chamber and a B bearing 42 located in the lower chamber. A clamping member 421 is provided at the lower end of the rotating shaft 4. Specifically, a clamping groove for the clamping member 421 to be clamped is provided at the lower end of the rotating shaft 4. An elastic member 411 is sleeved on the upper end of the rotating shaft 4. The elastic member 411 acts between the impeller 9 and the A bearing 41, with one end abutting against the inner top of the impeller 9 and the other end abutting against the A bearing 41 to provide an axial pre-tightening force to the support assembly. The elastic member 411 is a spring, and the clamping member 421 is a snap ring.

[0080] An intensifying part is injection-molded on the outer wall of the housing 3 around the receiving unit. The intensifying part extends outwards from top to bottom and includes a connecting seat 32 and a plurality of reinforcing ribs 321 surrounding the connecting seat 32. The second platform 312 is injection-molded together with the outer wall of the insertion part 1 and the intensifying part.

[0081] The drive mechanism includes a control board 5 and a stator that generates a magnetic field;

[0082] The stator includes a stator core 7 and an insulating skeleton 6 sleeved outside the stator core 7. The insulating skeleton 6 fits the shape of the stator core 7. The second platform 312 supports the yoke part 71 of the stator core 7. The tooth crown 72 of the stator core 7 extends out from the insulating skeleton 6. A winding 61 is wound around the tooth body of the insulating skeleton 6. When the winding 61 is powered on, a rotating magnetic field is generated. The control board 5 is a PCB circuit board;

[0083] A driven mechanism is provided on the inner wall of the impeller 9. The driven mechanism is used to interact with the magnetic field and includes a magnetic ring 8 that cooperates with the stator core 7 to drive the impeller 9 to rotate. The magnetic ring 8 is surrounded around the inner wall of the impeller 9 through a connecting frame 91. A blowing plate 10 is provided at the air blowing end of the impeller 9. Installation grooves 101 corresponding to the blade paths are provided around the blowing plate 10. The impeller 9 and the blowing plate 10 are injection-molded separately and then assembled.

[0084] A positioning platform 33 protruding outwards and a relief groove 34 recessed inwards are injection-molded on the housing 3. A positioning hole 51 matching the positioning platform 33 is provided on the control board 5. The positioning platform 33 is "convex"-shaped, so that the control board 5 is mounted on the housing 3 to complete the installation of the control board 5. Connecting arms 62 passing through the control board 5 through pressing holes 52 are provided around the lower end of the insulating skeleton 6. The connecting arms 62 correspond to the relief groove 34. The end copper wires of the winding 61 are wound around the connecting arms 62, and a ground wire is connected to any one of the connecting arms 62.

[0085] The working process of this embodiment:

[0086] The receiving unit is made of plastic injection molding. The receiving unit is placed into the shell mold as an insert. After the injection molding material enters the shell mold, it enters the cavity of the receiving unit through the injection channel 11 to form a support platform 31 that fits into the receiving unit.

[0087] The first platform 311 of the support platform 31 positions the A bearing 41 and B bearing 42 on the rotating shaft 4 in their respective chambers. The yoke 71 of the stator core 7 is supported on the second platform 312 of the support platform 31. When the winding 61 is energized, the stator core 7 and the winding 61 generate a rotating magnetic field. The magnetic ring 8 on the impeller 9 interacts with the magnetic field, causing the impeller to rotate through the rotating shaft 4.

[0088] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A connection structure based on a shell-supporting unit, characterized in that: The receiving unit is injection molded from plastic and includes an insertion part (1). The internal cavity of the insertion part (1) is used for the installation of the power transmission mechanism. An injection channel (11) is provided on the insertion part (1) for the injection material to flow into the internal cavity. The receiving unit is placed into the shell mold as an insert and injection molded together with the shell (3). After the injection material enters the shell mold, it forms a support platform (31) embedded in the insertion part (1) through the injection channel (11). The support platform (31) is integrally formed with the shell (3), so that the receiving unit and the shell (3) are fitted together to complete the assembly of the receiving unit and the shell (3). The first platform (311) of the support platform (31) provides a connecting carrier for the installation of the power transmission mechanism, and the second platform (312) of the support platform (31) provides support for the installation of the drive mechanism; The power transmission mechanism includes a rotating shaft (4), which is rotatable within the first platform (311) via a support assembly; The first platform (311) divides the internal chamber of the insertion part (1) into an upper chamber and a lower chamber, and the support assembly is sleeved on the rotating shaft (4); The drive mechanism includes a control board (5) and a stator that generates a magnetic field; The first platform (311) and the second platform (312) are located on the inner and outer sides of the injection channel (11).

2. The connection structure based on the shell support unit according to claim 1, characterized in that: The lower end of the insertion part (1) extends outward to form a snap-fit ​​part (2) to increase the contact area and anchoring depth with the injection molding material; The molding thickness of the first platform (311) and the molding thickness of the second platform (312) are both greater than the molding thickness in the injection channel (11).

3. The connection structure based on the shell support unit according to claim 1, characterized in that: The injection channels (11) are arranged at equal intervals around the insertion part (1), and the positions of the multiple injection channels (11) in the insertion part (1) match the positions of the support platform (31) that need to be injected.

4. The connection structure based on the shell support unit according to claim 2, characterized in that: The snap-fit ​​part (2) is perpendicular to the insertion part (1). The upper and lower surfaces of the snap-fit ​​part (2) are both planes. A transition section (21) is provided at the junction of the lower surface of the snap-fit ​​part (2) and the internal cavity of the insertion part (1). A bevel (12) is provided around the opening at the upper end of the insertion part (1) to connect with the internal chamber.

5. The connection structure based on the shell support unit according to claim 1, characterized in that: A reinforcing part is injection molded around the outer wall of the receiving unit on the housing (3). The reinforcing part extends outward from top to bottom. The second platform (312) covers the outer wall of the insertion part (1) and is injection molded together with the reinforcing part.

6. The connection structure based on the shell support unit according to claim 1, characterized in that: The fixed sleeve (92) is injection molded together with the impeller (9) as an insert, and the rotating shaft (4) is riveted to the fixed sleeve (92).

7. A connection structure based on a shell support unit according to claim 6, characterized in that: The support assembly includes bearing A (41) located in the upper chamber and bearing B (42) located in the lower chamber. A clamping element (421) is provided at the lower end of the rotating shaft (4), and an elastic element (411) is sleeved on the rotating shaft (4). The elastic element (411) acts between the impeller (9) and the A bearing (41) to apply an axial force.

8. A connection structure based on a shell-supporting unit according to claim 6, characterized in that: The stator includes an insulating frame (6) and a stator core (7). A winding (61) is wound on the teeth of the insulating frame (6), and a second platform (312) supports the yoke (71) of the stator core (7). A driven mechanism is provided on the inner wall of the impeller (9), which includes a magnetic ring (8) that cooperates with the stator core (7).

9. A connection structure based on a shell support unit according to claim 6, characterized in that: An air supply plate (10) is provided at the air supply end of the impeller (9), and an installation groove (101) corresponding to the blade path is provided around the air supply plate (10).

Images