Alternating current aluminum wire plastic package motor for fan coil

Abstract

The utility model provides an alternating current aluminum wire plastic package motor for a fan coil, which comprises a plastic casing, a circuit board is arranged in the plastic casing, the casing is provided with a mounting hole, and the mounting hole is an unthreaded hole; a through hole coaxial with the mounting hole is formed in the circuit board; the plastic pin is composed of a head part and a rod part which are integrally formed and connected. The side surface of the rod part is a smooth surface, and the rod part penetrates through the through hole and is in interference fit connection with the hole wall of the mounting hole; the head protrudes radially and abuts against the outer side face of the circuit board. Firstly, the contact area between the pin and the hole wall of the mounting hole is large, pressure is generated under the action of interference fit, and static friction force generated by the pressure is also large, so that after the pin is inserted into the mounting hole, the connection strength is higher, and the mounting structure strength of the circuit board is improved; 2, the side surface of the rod part is a smooth surface and is convenient to disassemble, so that the circuit board is convenient to disassemble; and 3, the structure of the mounting hole can be maintained to be completed after the pin is removed, and repeated use can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic-sealed motors, in particular to an AC aluminum wire plastic-sealed motor for a fan coil unit. Background Art

[0002] In order to reduce costs, the motors used to drive fan coil units generally use aluminum wire plastic-sealed motors. In addition to the advantages of low price, they also have the advantages of light weight, good heat dissipation performance, good sealing performance, and low noise.

[0003] Conventional motor circuit boards are mounted to the housing with bolts. However, because the housing is made of plastic, drilling threaded holes in the housing is weak and prone to thread stripping. Even using self-tapping screws, their connection strength is limited. Furthermore, self-tapping screws are typically designed for single-use. If used twice or multiple times, the connection strength is significantly reduced, making it difficult to disassemble and repair the circuit board.

[0004] Therefore, how to improve the connection strength between the circuit board and the housing has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In order to solve the technical problems in the background technology, the utility model discloses an AC aluminum wire plastic-sealed motor for a fan coil unit.

[0006] The utility model provides an AC aluminum wire plastic-sealed motor for a fan coil unit, comprising a plastic casing with a circuit board installed inside. The casing is provided with a mounting hole, which is a light hole.

[0007] The circuit board is provided with a through hole coaxially arranged with the mounting hole;

[0008] The plastic pin consists of a head and a rod that are integrally formed. The side of the rod is smooth, and the rod passes through the through hole and is connected to the hole wall of the mounting hole with an interference fit. The head protrudes radially and rests against the outer side of the circuit board.

[0009] The beneficial effects of the above arrangement are: 1. The contact area between the pin and the wall of the mounting hole is large, and pressure is generated under the action of interference fit. The static friction generated by this pressure is also large, so that after the pin is inserted into the mounting hole, the connection strength is higher, thereby improving the installation structure strength of the circuit board; 2. The side of the rod is smooth, which is convenient for disassembly, thereby facilitating the disassembly and assembly of the circuit board; 3. After the pin is removed, the structure of the mounting hole can be kept intact and can be reused; 4. Even if the mounting hole is deformed and the diameter becomes larger, it only needs to be replaced with a pin with a larger diameter to continue using it, thereby extending the service life of the casing.

[0010] When the motor is working in a high-temperature environment, the rod and the mounting hole are prone to plastic deformation and loosening, which makes the rod prone to axial displacement. Based on this, further improvements are: the insertion end of the pin is provided with a radially protruding bump; and a slot for locking the bump is provided in the mounting hole.

[0011] The presence of a bump makes it difficult to insert the rod into the mounting hole. To address this, a further improvement is to provide the pin with a groove cut along its axis. One end of the groove passes through the insertion end of the pin, and the other extends to the connection between the head and the rod. The groove wall is provided with an arc-shaped groove concentric with the bump, ensuring that the thickness of the bump is consistent with the thickness of the parts on either side, and the bump is deformable. During installation, the bump, blocked by the opening of the mounting hole, deforms toward the groove to a position coplanar with the rod, allowing smooth insertion into the mounting hole. When the bump moves to the slot position, it resets and locks into the slot, limiting the pin installation and preventing axial displacement.

[0012] The rod and the mounting hole are in surface-to-surface contact, creating significant resistance during assembly and disassembly, making assembly and disassembly difficult. To address this issue, a further improvement is to provide the rod's sidewall with multiple protruding teeth that create an interference fit with the mounting hole wall. The protruding teeth not only ensure the pin's mounting strength but also reduce the contact area between the pin and the mounting hole wall, facilitating assembly and disassembly.

[0013] The convex teeth have the following two structures: the first structure is that the convex teeth are inclined toward the head, which can increase the resistance when the convex teeth are pulled out, making the position of the pin more stable; the second structure is that the convex teeth are spirally shaped. This structure makes it difficult to insert and remove the pin axially. It can be installed by rotating in the spiral direction and disassembled by rotating in the opposite direction. This structure makes it less likely for the pin to move axially.

[0014] For the first structure, the convex teeth can be designed to be annular and coaxial with the rod. This structure has a large contact area and is difficult to disassemble and assemble. Therefore, it can be designed to have multiple convex teeth at the same axial position that are evenly spaced.

[0015] For the second structure mentioned above, the protruding teeth may be designed to be discontinuous spirals, which is also used to reduce the contact area between the protruding teeth and the inner wall of the mounting hole.

[0016] In order to further improve the position stability of the circuit board, specifically: a limiting groove is provided on the housing; and the main board of the circuit board is clamped in the limiting groove.

[0017] The beneficial effects of the present invention are: 1. The contact area between the pin and the wall of the mounting hole is large, and pressure is generated under the action of interference fit. The static friction generated by this pressure is also large, so that after the pin is inserted into the mounting hole, the connection strength is higher, thereby improving the installation structure strength of the circuit board; 2. The side surface of the rod is smooth, which is convenient for disassembly, thereby facilitating the disassembly and assembly of the circuit board; 3. After the pin is removed, the structure of the mounting hole can be kept intact and can be reused; 4. Even if the mounting hole is deformed and the diameter becomes larger, it only needs to be replaced with a pin with a larger diameter for continued use, thereby extending the service life of the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 It is a main sectional view of the utility model;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0021] In the figure: 1. housing; 2. circuit board; 3. mounting hole; 4. through hole; 5. pin; 6. bump; 7. slot; 8. groove; 9. arc groove; 10. protruding tooth; 11. limiting groove; 51. head; 52. rod. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0023] Example 1:

[0024] like Figure 1 and Figure 2 As shown, the utility model discloses an AC aluminum wire plastic-encapsulated motor for a fan coil unit, comprising a plastic housing 1, a circuit board 2 mounted therein, the housing 1 being provided with a mounting hole 3, which is a plain hole. The circuit board 2 is provided with a through hole 4 coaxially arranged with the mounting hole 3;

[0025] The plastic pin 5 consists of an integrally formed head 51 and a cylindrical rod 52; the side of the rod 52 is smooth, and the rod 52 passes through the through hole 4 and is connected to the hole wall of the mounting hole 3 by an interference fit; the head 51 protrudes radially and abuts against the outer side of the circuit board 2.

[0026] A limiting groove 11 is provided on the housing 1; the main board of the circuit board 2 is clamped in the limiting groove 11, so that the circuit board 2 is installed and limited, and its position stability is higher.

[0027] The beneficial effects of the above arrangement are: 1. The contact area between the pin 5 and the wall of the mounting hole 3 is large, and pressure is generated under the action of interference fit. The static friction generated by this pressure is also large, so that after the pin 5 is inserted into the mounting hole 3, the connection strength is higher, thereby improving the installation structure strength of the circuit board 2; 2. The side surface of the rod 52 is smooth, which is convenient for disassembly, thereby facilitating the disassembly and assembly of the circuit board 2; 3. After the pin 5 is removed, the structure of the mounting hole 3 can be kept intact and can be reused; 4. Even if the mounting hole 3 is deformed and the diameter becomes larger, it only needs to be replaced with a pin 5 with a larger diameter to continue using it, thereby extending the service life of the casing 1.

[0028] Example 2:

[0029] Compared to the first embodiment, the differences are as follows: the insertion end of the pin 5 is provided with a radially protruding bump 6; and the mounting hole 3 is provided with a slot 7 for engaging the bump 6. This arrangement ensures that when the motor is operating in a high-temperature environment and the rod 52 and the mounting hole 3 undergo plastic deformation and become loose, the position of the rod 52 is still maintained, preventing axial displacement due to loosening.

[0030] Providing the protrusion 6 alone would make it difficult for the rod 52 to be inserted into the mounting hole 3. Therefore, the pin 5 is provided with a groove 8 cut along its axis. One end of the groove 8 passes through the insertion end of the pin 5, and the other end extends to the connection between the head 51 and the rod 52. The groove wall of the groove 8 is provided with an arc-shaped groove 9 concentric with the protrusion 6, so that the thickness of the protrusion 6 is consistent with the thickness of the parts on both sides, and the protrusion 6 can be deformed. During installation, the protrusion 6 will be blocked by the open end of the mounting hole 3 and deform toward the groove 8 to a position coplanar with the rod 52, thereby being smoothly inserted into the mounting hole 3. When the protrusion 6 moves to the position of the retaining groove 7, it resets and locks into the retaining groove 7, realizing the installation limit of the pin 5 and preventing axial displacement.

[0031] Example 3:

[0032] Compared with the second embodiment, the difference is that the side wall of the rod portion 52 is provided with a plurality of protruding teeth 10, which are connected with the wall of the mounting hole 3 by an interference fit. The provision of the protruding teeth 10 not only ensures the installation strength of the pin 5, but also reduces the contact area between the pin 5 and the wall of the mounting hole 3, thereby facilitating the installation and removal of the pin 5.

[0033] The protruding teeth 10 are inclined toward the head 51 , which can increase the resistance when the protruding teeth 10 are pulled out, thereby making the position of the pin 5 more stable.

[0034] In this embodiment, the protruding tooth 10 is annular and coaxial with the rod 52 .

[0035] Example 4:

[0036] Compared with the third embodiment, the difference is that there are multiple protruding teeth 10 at the same axial position, which are evenly spaced apart. This arrangement is used to reduce the contact area between the protruding teeth 10 and the inner wall of the mounting hole 3, making it easier to disassemble and assemble.

[0037] Embodiment 5:

[0038] Compared with the second embodiment, the difference is that the side wall of the rod 52 is provided with a convex tooth 10, which is spiral-shaped. This structure makes it difficult to axially insert and remove the pin 5. It can be installed by rotating it in the spiral direction and disassembled by rotating it in the reverse direction. This structure makes it more difficult for the pin 5 to move axially.

[0039] Example 6:

[0040] Compared with the fifth embodiment, the difference is that the protruding teeth 10 are designed to be discontinuous spirals, which is also used to reduce the contact area between the protruding teeth 10 and the inner wall of the mounting hole 3.

[0041] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. An AC aluminum wire plastic-sealed motor for a fan coil unit, comprising a plastic housing (1) with a circuit board (2) mounted therein, characterized in that: The housing (1) is provided with a mounting hole (3), and the mounting hole (3) is a light hole; The circuit board (2) is provided with a through hole (4) coaxially arranged with the mounting hole (3); The plastic pin (5) is composed of a head (51) and a rod (52) connected in an integral molding; the side surface of the rod (52) is smooth; the rod (52) passes through the through hole (4) and is connected to the hole wall of the mounting hole (3) through an interference fit; the head (51) protrudes radially and abuts against the outer side surface of the circuit board (2).

2. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 1, characterized in that: The insertion end of the pin (5) is provided with a radially protruding bump (6); A clamping groove (7) for clamping the protrusion (6) is provided in the mounting hole (3).

3. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 2, characterized in that: The pin (5) is provided with a groove (8) cut along its axis; One end of the groove (8) passes through the insertion end of the pin (5), and the other end extends to the connection between the head (51) and the rod (52); The groove wall of the groove (8) is provided with an arc groove (9) concentric with the convex block (6), so that the thickness of the convex block (6) is consistent with the thickness of the parts on both sides thereof, and the convex block (6) can be deformed.

4. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 1, characterized in that: The side wall of the rod portion (52) is provided with a plurality of protruding teeth (10), and the protruding teeth (10) are connected to the hole wall of the mounting hole (3) by interference fit.

5. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 4, characterized in that: The protruding teeth (10) are inclined toward the head (51).

6. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 5, characterized in that: The convex tooth (10) is annular and coaxial with the rod (52).

7. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 6, characterized in that: There are a plurality of convex teeth (10) at the same axial position distributed at even intervals.

8. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 4, characterized in that: The convex teeth (10) are in a spiral shape.

9. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 4, characterized in that: The convex teeth (10) form an intermittent spiral shape.

10. The AC aluminum wire plastic-sealed motor for fan coil units according to claim 1, characterized in that: A limiting groove (11) is provided on the housing (1); The main board of the circuit board (2) is clamped in the limiting groove (11).

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