A coil structure for PCB relay

Abstract

The invention discloses a coil structure for a PCB relay, comprising a coil frame and an enameled wire; a circumferential surface of a winding shaft of the coil frame is provided with a protrusion group consisting of a plurality of small protrusions; the protrusion group at least comprises a first protrusion, a second protrusion and a third protrusion, the first protrusion and the second protrusion are arranged with a gap along the first direction of the winding shaft, the third protrusion is arranged with a staggered position with the first protrusion and the second protrusion in the first direction and corresponds to the gap between the first protrusion and the second protrusion, and the third protrusion is arranged with a gap with the first protrusion and the second protrusion in the second direction, so that the projection of the direction of the enameled wire wound by the protrusion group is a curve, and the mutual cooperation of the first protrusion, the second protrusion and the third protrusion is used to limit the enameled wire passing through the protrusion group. The invention can effectively prevent the rotation or up and down movement of the winding on the coil frame after reflow soldering, and has the characteristics of simple structure, easy implementation and good effect.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a coil structure for a PCB relay. Background Art

[0002] PCB relay is an electromagnetic relay that solders the relay pins on the circuit board. Through-hole reflow soldering is the welding process commonly used for PCB relays. With the development of miniaturization and integration of products, relays with different load current levels are installed on the PCB board at the same time. In order to meet the welding requirements of relays with different load current levels, the welding temperature needs to be greatly increased. Due to the high temperature of reflow soldering, the coil structure of the prior art will shrink the electromagnetic relay winding under the influence of the reflow soldering heat, and a small gap will be generated between the coil frame of the fixed winding. The winding shaft of the coil frame of the fixed winding is usually cylindrical. When subjected to mechanical conditions such as vibration and impact, the winding will rotate or even move up and down, causing stress concentration at the local position of the beginning and end of the winding, resulting in winding breakage failure or "abnormal noise". Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a coil structure for a PCB relay. Through structural improvement, the rotation or up and down movement of the winding on the coil frame after reflow soldering can be effectively prevented, and the structure is simple, easy to implement and has good effects.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a coil structure for a PCB relay, comprising a coil frame and an enameled wire; the coil frame comprises a cylindrical winding shaft and flanges integrally connected to both ends of the winding shaft, and a winding space is formed outside the winding shaft between the flanges at both ends; the enameled wire is wound in the winding space of the coil frame; a protrusion group consisting of a plurality of small protrusions is protruded outwardly on the circumference of the winding shaft of the coil frame; the protrusion group comprises at least a first protrusion, a second protrusion and a third protrusion, the first protrusion and the second protrusion are arranged with a gap along the first direction of the winding shaft, the third protrusion is arranged in a staggered manner with the first protrusion and the second protrusion in the first direction and corresponds to the gap between the first protrusion and the second protrusion, and the third protrusion is arranged with a gap with the first protrusion and the second protrusion in the second direction, so that the projection of the direction of the enameled wire wound by the protrusion group is curved, and the first protrusion, the second protrusion and the third protrusion are used to cooperate with each other to limit the enameled wire passing through the protrusion group in the first direction and the second direction.

[0005] The first direction is along the axial direction of the winding shaft, and the second direction is along the circumferential direction of the winding shaft; the gap size between the first protrusion and the second protrusion is the diameter size of at least two enameled wires; the first protrusion and the second protrusion cooperate to limit the movement of the enameled wire along the axial direction of the winding shaft in the first direction when the enameled wire passes through the protrusion group; the third protrusion cooperates with the first protrusion and the second protrusion to limit the rotation of the enameled wire along the circumferential direction of the winding shaft when the enameled wire passes through the protrusion group in the second direction.

[0006] The protrusion group consists of two first protrusions, two second protrusions and one third protrusion; wherein the third protrusion is located in the middle, one first protrusion and one second protrusion are located on one side of the third protrusion, another first protrusion and another second protrusion are located on the other side of the third protrusion, and the first protrusion and the second protrusion on both sides of the third protrusion are aligned along the axial direction of the winding shaft.

[0007] The first direction is along the circumferential direction of the winding shaft, and the second direction is along the axial direction of the winding shaft; the third protrusion is located at a position corresponding to the first protrusion and the second protrusion to press the enameled wire passing through the protrusion group into the gap between the first protrusion and the second protrusion; the third protrusion cooperates with the first protrusion and the second protrusion respectively to limit the rotation of the enameled wire along the circumferential direction of the winding shaft in the first direction when the enameled wire passes through the protrusion group, and to limit the movement of the enameled wire along the axial direction of the winding shaft in the second direction.

[0008] The protrusion group consists of two first protrusions, one second protrusion and two third protrusions; wherein the second protrusion is located in the middle, and the two first protrusions are located on both sides of the second protrusion; the two third protrusions are respectively located at the corresponding matching positions of the gaps between the two first protrusions and one second protrusion, and make the projection of the direction of the enameled wire winding around the protrusion group wave-shaped.

[0009] A distance from the third protrusion to the first protrusion is the same as a distance from the third protrusion to the second protrusion.

[0010] The cross sections of the first protrusion, the second protrusion and the third protrusion are respectively circular.

[0011] The first protrusion, the second protrusion and the third protrusion are all small at the top and large at the bottom.

[0012] The heights of the first protrusion, the second protrusion and the third protrusion are all greater than 1.5 times the diameter of the enameled wire.

[0013] A flange at one end of the coil frame is provided with a winding foot, and the protrusion group is arranged at a position close to the flange at one end of the coil frame.

[0014] The first protrusion, the second protrusion and the third protrusion have the same size.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention adopts a protrusion group consisting of a plurality of small protrusions extending outwardly from the circumference of the winding shaft of the coil frame; and the protrusion group includes at least a first protrusion, a second protrusion and a third protrusion, the first protrusion and the second protrusion are arranged with a gap along the first direction of the winding shaft, the third protrusion is arranged with a staggered position with the first protrusion and the second protrusion in the first direction and corresponds to the gap between the first protrusion and the second protrusion, and the third protrusion is arranged with a gap with the first protrusion and the second protrusion in the second direction, a small number of enameled wires can be accommodated between the protrusions, and the projection of the direction of the enameled wires wound around the protrusion group is curved, the shrinkage deformation caused by the small number of enameled wires accommodated between the protrusions is small, and after the shrinkage deformation occurs, the protrusion group limits the movable space of the winding in the first direction and the second direction to a smaller range. This structure of the present invention can effectively prevent the winding from rotating or moving up and down on the coil frame after reflow soldering, and has the characteristics of simple structure, easy implementation and good effect.

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the coil structure for a PCB relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of the coil frame according to the first embodiment of the present invention;

[0019] Figure 2 is a front view of a coil frame according to a first embodiment of the present invention;

[0020] Figure 3 1 is a front view of a coil frame (with a portion of enameled wire wound thereon) according to the first embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the three-dimensional structure of the coil frame of the second embodiment of the present invention;

[0022] Figure 5 is a front view of a coil frame according to a second embodiment of the present invention;

[0023] Figure 6 is a front view of a coil frame (with a portion of enameled wire wound thereon) according to a second embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of the three-dimensional structure of the coil frame of the third embodiment of the present invention;

[0025] Figure 8 is a front view of a coil frame of a third embodiment of the present invention;

[0026] Fig. 9 1 is a front view of a coil frame (with a portion of enameled wire wound thereon) of the third embodiment of the present invention (before the winding is shrunk);

[0027] Fig.10 1 is a front view of the coil frame (wound with a portion of enameled wire) of the third embodiment of the present invention (after the winding is shrunk);

[0028] Fig.11 yes Fig.10 A magnified schematic diagram of part A in FIG.

[0029] Fig.12 is a schematic diagram of the three-dimensional structure of a coil frame according to a fourth embodiment of the present invention;

[0030] Fig.13 is a front view of a coil frame according to a fourth embodiment of the present invention;

[0031] Fig.14 It is a front view of the coil frame (around which a portion of the enameled wire is wound) of the third embodiment of the present invention. DETAILED DESCRIPTION

[0032] Embodiment 1

[0033] See also Figures 1 to 3As shown, a coil structure for a PCB relay of the present invention comprises a coil frame 2 and an enameled wire 1; the coil frame 2 comprises a cylindrical winding shaft 21 and flanges 22 and 23 integrally connected to both ends of the winding shaft. In this embodiment, the coil frame 2 is placed vertically, that is, the axis of the winding shaft 21 is vertically arranged, the flanges at both ends are respectively an upper flange 22 and a lower flange 23, and a winding space is formed outside the winding shaft 21 between the flanges 22 and 23 at both ends; the enameled wire 1 is wound in the winding space of the coil frame 2; the circumference of the winding shaft 21 of the coil frame 2 is protruded outwardly with a protrusion group consisting of a plurality of small protrusions; the protrusion group comprises a first protrusion 31 , a second protrusion 32 and a third protrusion 33, the first protrusion 31 and the second protrusion 32 are arranged with a gap along the first direction of the winding shaft, the third protrusion 33 is arranged with a staggered position with the first protrusion 31 and the second protrusion 32 in the first direction and corresponds to the gap between the first protrusion 31 and the second protrusion 32, and the third protrusion 33 is arranged with a gap with the first protrusion 31 and the second protrusion 32 in the second direction, so that the direction projection of the enameled wire 1 wound around the protrusion group is a curve, and the mutual cooperation of the first protrusion 31, the second protrusion 32 and the third protrusion 33 is used to limit the enameled wire 1 passing through the protrusion group in the first direction and the second direction. The protrusion space of the present invention can accommodate a small number of enameled wires, and the direction projection of the enameled wire wound around the protrusion group is a curve. The shrinkage deformation caused by the small number of enameled wires accommodated between the protrusions is small. After the shrinkage deformation occurs, the protrusion group limits the movable space of the winding in the first direction and the second direction to a smaller range.

[0034] In this embodiment, the first direction is along the axial direction of the winding shaft 21, and the second direction is along the circumferential direction of the winding shaft 21; the gap size between the first protrusion 31 and the second protrusion 32 is the diameter size of the two enameled wires 1. Of course, the gap size can also be larger than the diameter size of the two enameled wires 1, for example, the gap size is the diameter size of three enameled wires 1, etc.; the first protrusion 31 and the second protrusion 32 cooperate with each other to limit the movement of the enameled wire along the axial direction of the winding shaft in the first direction when the enameled wire passes through the protrusion group, that is, the first protrusion 31 and the second protrusion 32 play the role of upper and lower limiters; the third protrusion 33 cooperates with the first protrusion 31 and the second protrusion 32 to limit the rotation of the enameled wire along the circumferential direction of the winding shaft when the enameled wire passes through the protrusion group in the second direction.

[0035] In this embodiment, the distance from the third protrusion 33 to the first protrusion 31 is the same as the distance from the third protrusion 33 to the second protrusion 32 .

[0036] In this embodiment, the cross sections of the first protrusion 31 , the second protrusion 32 and the third protrusion 33 are circular.

[0037] In this embodiment, the first protrusion 31, the second protrusion 32 and the third protrusion 33 are all small at the top and large at the bottom. This structure facilitates the processing and molding of parts and makes it easy for the enameled wire to fall into the gap between the protrusions.

[0038] In this embodiment, the heights of the first protrusion 31, the second protrusion 32 and the third protrusion 33 are all greater than 1.5 times the diameter of the enameled wire 1. This structure can ensure that at least one layer of enameled wire falls completely into the protrusions.

[0039] In this embodiment, the flange at one end of the coil frame, i.e., the lower flange 23, is provided with a winding foot, and the lower flange 23 is also provided with a lead-in groove 24, and the protrusion group is provided at a position close to the flange at one end of the coil frame, i.e., the lower flange 23. This structure enables the protrusions to be distributed as close to the beginning and end of the winding as possible, thereby improving the stability of the beginning and end of the winding.

[0040] In this embodiment, the first protrusion 31 , the second protrusion 32 and the third protrusion 33 are of the same size.

[0041] A coil structure for a PCB relay of the present invention adopts a protrusion group consisting of a plurality of small protrusions extending outwardly from the circumference of a winding shaft 21 of a coil frame 2; and the protrusion group includes a first protrusion 31, a second protrusion 32 and a third protrusion 33, the first protrusion 31 and the second protrusion 32 are arranged with a gap along the first direction of the winding shaft 21, the third protrusion 33 is arranged with a staggered position with the first protrusion 31 and the second protrusion 32 in the first direction and corresponds to the gap between the first protrusion 31 and the second protrusion 32, and the third protrusion 33 is arranged with a gap with the first protrusion 31 and the second protrusion 32 in the second direction, so that the projection of the direction of the enameled wire 1 wound by the protrusion group is a curve, and the mutual cooperation of the first protrusion 31, the second protrusion 32 and the third protrusion 33 is used to limit the enameled wire passing through the protrusion group in the first direction and the second direction. The present invention utilizes the combination of the protrusion features of the first protrusion 31, the second protrusion 32 and the third protrusion 33 to restrain a number of enameled wires and change the direction of these enameled wires, so that the projection of the direction of the enameled wires is changed from a straight line to a curve; the number of enameled wires restrained between the protrusions is small, and the shrinkage produced is small, so the gap between the enameled wires and the protrusions is small, and the upper and lower rows of protrusion features composed of the first protrusion 31 and the second protrusion 32 will limit the winding from moving in the upward and downward directions, and the left and right rows of protrusion features composed of the third protrusion 33 and the first protrusion 31 and the second protrusion 32 will limit the winding from rotating around the winding axis. This structure of the present invention can effectively prevent the winding from rotating or moving up and down on the coil frame after reflow soldering, and has the characteristics of simple structure, easy implementation and good effect.

[0042] Embodiment 2

[0043] See also Figures 4 to 6 As shown, a coil structure for a PCB relay of the present invention is different from that of the first embodiment in that the first direction is along the circumferential direction of the winding shaft 21, and the second direction is along the axial direction of the winding shaft 21; the third protrusion 33 is located at a position corresponding to the first protrusion 31 and the second protrusion 32 to press the enameled wire 1 passing through the protrusion group into the gap between the first protrusion 31 and the second protrusion 32; the third protrusion 33 cooperates with the first protrusion 31 and the second protrusion 32 respectively to limit the rotation of the enameled wire along the circumferential direction of the winding shaft in the first direction and to limit the movement of the enameled wire along the axial direction of the winding shaft in the second direction.

[0044] Embodiment 3

[0045] See also Figures 7 to 11 As shown, a coil structure for a PCB relay of the present invention is different from that of the first embodiment in that the protrusion group also includes a first protrusion 31 and a second protrusion 32 arranged on the other side of the third protrusion 33 (relative to the side of the first protrusion 31 and the second protrusion 32 previously set), and the first protrusion and the second protrusion on both sides of the third protrusion are aligned along the axial direction of the winding shaft; in this way, the protrusion group consists of five protrusions, the third protrusion 33 is in the middle, the two first protrusions 31 and the two second protrusions 32 are located on both sides of the third protrusion 33, and the newly added first protrusion 31 and the second protrusion 32 cooperate to limit the movement of the enameled wire along the axial direction of the winding shaft in the first direction passing through the protrusion group, that is, the newly added first protrusion 31 and the second protrusion 32 play the role of upper and lower limit; the third protrusion 33 cooperates with the newly added first protrusion 31 and the second protrusion 32 to limit the rotation of the enameled wire 1 along the circumferential direction of the winding shaft in the second direction passing through the protrusion group; in this way, Fig.11 As shown, the two enameled wires are limited after passing through a first protrusion 31 and a second protrusion 32 set previously, and the two enameled wires are separated at the third protrusion 33. After passing through the newly added first protrusion 31 and the second protrusion 32, the two enameled wires are limited again. Under the action of the limiting feature, when the gap between the winding and the limiting feature is still △1, the rotation space of the winding is limited to △2 through the adjacent convex bulge (i.e., the third protrusion 33), and the rotation space is significantly reduced. In the prior art, after a convex column feature is added to the coil shaft of a single convex column structure, the enameled wire will change its path under the action of the convex column after being routed to the convex column. After passing the convex column, the set winding path is restored, and the rotation space limitation effect is relatively small. The risk of stress concentration in the local area of ​​the winding causing a winding break or "abnormal noise" still exists.

[0046] Embodiment 4

[0047] See also Figure 12 to Figure 14 As shown, a coil structure for a PCB relay of the present invention is different from the second embodiment in that a first protrusion 31 and a third protrusion 33 are newly added to the protrusion group, and the newly added third protrusion 33 is located at a position corresponding to the newly added first protrusion 31 and the previously set second protrusion 32 to press the enameled wire 1 passing through the protrusion group into the gap between the newly added first protrusion 31 and the previously set second protrusion 32. In this way, the protrusion group composed of five protrusions makes the enameled wire 1 passing through the protrusion group have a wavy route (such as Fig.14 This group of protrusions hinders the winding from rotating or moving up and down on the coil frame.

[0048] The prior art uses a protrusion to limit the contracted winding. Generally, the larger the characteristic volume of the protrusion, the more obvious the limiting effect. However, the limiting feature also compresses the winding space of the winding. When the coil resistance specification is the same, the smaller the ampere-turn value, the smaller the suction force. Especially for small relays, the winding space can be more tight. The present invention can reduce the area and height of the protrusion through a protrusion group composed of multiple protrusions, free up the winding space of the enameled wire, and the protrusion is not easy to break.

[0049] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A coil structure for a PCB relay, comprising a coil frame and an enameled wire; the coil frame comprises a cylindrical winding shaft and flanges integrally connected to both ends of the winding shaft, and a winding space is formed outside the winding shaft between the flanges at both ends; the enameled wire is wound in the winding space of the coil frame; characterized in that: The circumference of the winding shaft of the coil frame is provided with a protrusion group consisting of a plurality of small protrusions extending outward; the protrusion group includes at least a first protrusion, a second protrusion and a third protrusion, the first protrusion and the second protrusion are arranged with a gap along the first direction of the winding shaft, the third protrusion is arranged with an offset arrangement with the first protrusion and the second protrusion in the first direction and corresponds to the gap between the first protrusion and the second protrusion, and the third protrusion is arranged with a gap with the first protrusion and the second protrusion in the second direction, so that the projection of the direction of the enameled wire wound by the protrusion group is curved, and the mutual cooperation of the first protrusion, the second protrusion and the third protrusion is used to limit the enameled wire passing through the protrusion group in the first direction and the second direction.

2. The coil structure for a PCB relay according to claim 1, characterized in that: The first direction is along the axial direction of the winding shaft, and the second direction is along the circumferential direction of the winding shaft; the gap size between the first protrusion and the second protrusion is the diameter size of at least two enameled wires; the first protrusion and the second protrusion cooperate to limit the movement of the enameled wire along the axial direction of the winding shaft in the first direction when the enameled wire passes through the protrusion group; the third protrusion cooperates with the first protrusion and the second protrusion to limit the rotation of the enameled wire along the circumferential direction of the winding shaft when the enameled wire passes through the protrusion group in the second direction.

3. The coil structure for a PCB relay according to claim 2, characterized in that: The protrusion group consists of two first protrusions, two second protrusions and one third protrusion; wherein the third protrusion is located in the middle, one first protrusion and one second protrusion are located on one side of the third protrusion, another first protrusion and another second protrusion are located on the other side of the third protrusion, and the first protrusion and the second protrusion on both sides of the third protrusion are aligned along the axial direction of the winding shaft.

4. The coil structure for a PCB relay according to claim 1, characterized in that: The first direction is along the circumferential direction of the winding shaft, and the second direction is along the axial direction of the winding shaft; the third protrusion is located at a position corresponding to the first protrusion and the second protrusion to press the enameled wire passing through the protrusion group into the gap between the first protrusion and the second protrusion; the third protrusion cooperates with the first protrusion and the second protrusion respectively to limit the rotation of the enameled wire along the circumferential direction of the winding shaft in the first direction when the enameled wire passes through the protrusion group, and to limit the movement of the enameled wire along the axial direction of the winding shaft in the second direction.

5. The coil structure for a PCB relay according to claim 4, characterized in that: The protrusion group consists of two first protrusions, one second protrusion and two third protrusions; wherein the second protrusion is located in the middle, and the two first protrusions are located on both sides of the second protrusion; the two third protrusions are respectively located at the corresponding matching positions of the gaps between the two first protrusions and one second protrusion, and make the projection of the direction of the enameled wire winding around the protrusion group wave-shaped.

6. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: A distance from the third protrusion to the first protrusion is the same as a distance from the third protrusion to the second protrusion.

7. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The cross sections of the first protrusion, the second protrusion and the third protrusion are respectively circular.

8. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The first protrusion, the second protrusion and the third protrusion are all small at the top and large at the bottom.

9. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The heights of the first protrusion, the second protrusion and the third protrusion are all greater than 1.5 times the diameter of the enameled wire.

10. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: A flange at one end of the coil frame is provided with a winding foot, and the protrusion group is arranged at a position close to the flange at one end of the coil frame.

11. The coil structure for a PCB relay according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The first protrusion, the second protrusion and the third protrusion have the same size.

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