Electromagnetic coil

Abstract

The utility model belongs to the technical field of electromagnetic valves, and discloses an electromagnetic coil. The electromagnetic coil comprises a coil framework, a plastic-coated shell and a shell, a winding is arranged on the coil framework, the coil framework is coated with the plastic-coated shell, and the shell is assembled outside the plastic-coated shell; the shell and / or the coil framework are / is provided with a concave part, at least one end of the coil framework is provided with a sealing part, at least part of the sealing part is located in the concave part, the sealing part is pressed by the coil framework and the shell in the axial direction of the coil framework, at least part of the sealing part abuts against the concave part in the radial direction of the coil framework, and therefore water vapor is blocked in the axial direction and the radial direction of the coil framework. And water vapor is prevented from entering the winding along a gap between the plastic-coated shell and the coil framework, so that the sealing effect is further improved, the electromagnetic coil is suitable for various complex working environments, and the service life of the electromagnetic coil is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to an electromagnetic coil. Background Art

[0002] With the development of solenoid valves, their use in engineering machinery, agricultural machinery, machine tools, metallurgy, special vehicle manufacturing, warehousing and logistics and other industries has become more and more widespread, and the performance requirements of solenoid valves have become higher and higher; especially in some harsh working environments, such as high temperature, extreme cold, humidity and heat and other extreme conditions, the reliability of solenoid valves faces greater challenges.

[0003] As one of the core components of the solenoid valve, the waterproofness of the electromagnetic coil is particularly critical. In the existing technology, the electromagnetic coil usually includes a coil frame and a plastic shell. The plastic shell is covered on the outside of the coil frame and welded to the coil frame to prevent water vapor from entering the interior of the electromagnetic coil. However, due to the relatively harsh usage scenarios of the electromagnetic coil, for example, due to thermal expansion and contraction, the plastic shell and the coil frame may easily separate, and the waterproof effect is still not ideal.

[0004] Therefore, there is an urgent need for an electromagnetic coil to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide an electromagnetic coil, which improves the sealing effect of the electromagnetic coil, makes the electromagnetic coil suitable for various complex working environments, and effectively prolongs the service life of the electromagnetic coil.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Solenoid coil, comprising:

[0008] a coil skeleton, wherein a winding is provided on the coil skeleton;

[0009] A plastic shell, the plastic shell covering the coil skeleton;

[0010] A shell, the shell being arranged outside the plastic-coated shell;

[0011] The shell and / or the coil frame has a recess, and at least one end of the coil frame is provided with a sealing portion, at least part of the sealing portion is located in the recess, along the axial direction of the coil frame, the sealing portion is pressed by the coil frame and the shell, and along the radial direction of the coil frame, at least part of the sealing portion abuts against the recess.

[0012] Optionally, along the axial direction of the coil bobbin, at least part of the plastic-coated shell is located between the coil bobbin and the outer shell. The coil bobbin has a receiving groove for arranging the sealing part, and the wall forming the receiving groove includes the wall of the concave part and at least part of the wall of the plastic-coated shell.

[0013] Optionally, the coil bobbin includes a bobbin and two flange plates. The two ends of the bobbin are respectively connected to the flange plates or the bobbin and the flange plates are of an integral structure. At least one end of the plastic-coated shell is provided with a groove part;

[0014] The concave part is located on the flange plate, and the concave part is opposite to the groove part. The groove part and the concave part jointly enclose to form the receiving groove;

[0015] And / or, the concave part is located on the outer shell, and the concave part is opposite to the groove part of the plastic-coated shell. The groove part and the concave part jointly enclose to form the receiving groove.

[0016] Optionally, the receiving groove is an annular receiving groove.

[0017] Optionally, at least one side of the flange plate facing away from the bobbin is provided with a protrusion. Along the radial direction of the flange plate, the protrusion is located outside the receiving groove.

[0018] Optionally, the cross-section of the protrusion is one of a triangle, a rectangle, and a trapezoid.

[0019] Optionally, at least one circumferential surface of the flange plate is provided with a waterproof groove. Along the radial direction of the flange plate, the waterproof groove is located outside the receiving groove.

[0020] Optionally, the cross-sectional shape of the waterproof groove is one of a V shape, a U shape, a trapezoid, and a "凵" shape.

[0021] Optionally, at least one outer circumferential surface of the flange plate is provided with a welding rib, and the welding rib is integrally connected with the plastic-coated shell.

[0022] Beneficial effects:

[0023] The utility model provides an electromagnetic coil, comprising a coil skeleton, a plastic-coated shell and an outer shell, wherein a winding is provided on the coil skeleton, the plastic-coated shell is coated on the outside of the coil skeleton, and the outer shell is arranged outside the plastic-coated shell; the outer shell and / or the coil skeleton has a recess, and at least one end portion of the coil skeleton is provided with a sealing portion, at least part of the sealing portion is located in the recess, along the axial direction of the coil skeleton, the sealing portion is pressed by the coil skeleton and the outer shell, and along the radial direction of the coil skeleton, at least part of the sealing portion abuts against the recess, thereby blocking water vapor in the axial and radial directions of the coil skeleton, preventing water vapor from entering the winding along the gap between the plastic-coated shell and the coil skeleton, further improving the sealing effect, making the electromagnetic coil suitable for various complex working environments, and effectively extending the service life of the electromagnetic coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the electromagnetic coil provided in the first embodiment of the present utility model at one viewing angle;

[0025] Figure 2 This is a schematic structural diagram of the electromagnetic coil provided in the first embodiment of the present utility model from another perspective;

[0026] Figure 3 This utility model embodiment provides Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0028] Figure 5 It is a structural schematic diagram of a housing provided with a recess;

[0029] Figure 6 This is a schematic diagram of a structure in which recesses are provided on both the shell and the coil frame;

[0030] Figure 7 The fourth embodiment of the present invention provides Figure 2 Cross-sectional view at AA in the middle;

[0031] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle;

[0032] Figure 9 The sixth embodiment of the present invention provides Figure 2 Cross-sectional view at AA in the middle;

[0033] Figure 10 yes Figure 9 A partial enlarged view of point D in the middle.

[0034] In the picture:

[0035] 100, coil bobbin; 110, bobbin; 120, flange; 121, recess; 101, winding;

[0036] 200, plastic shell; 221, groove;

[0037] 310, receiving groove; 320, sealing portion; 330, protrusion; 340, waterproof groove; 350, welding rib;

[0038] 400. Shell. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0043] Example 1

[0044] This embodiment provides an electromagnetic coil, such as Figure 1-Figure 3 As shown, the electromagnetic coil includes a coil skeleton 100, a plastic shell 200 and a shell 400, a winding 101 is provided on the coil skeleton 100, the plastic shell 200 is covered on the outside of the coil skeleton 100, and the shell 400 is arranged outside the plastic shell 200; the shell 400 and / or the coil skeleton 100 has a recess 121, and at least one end of the coil skeleton 100 is provided with a sealing portion 320, at least part of the sealing portion 320 is located in the recess 121, along the axial direction of the coil skeleton 100, the sealing portion 320 is pressed by the coil skeleton 100 and the shell 400, and along the radial direction of the coil skeleton 100, at least part of the sealing portion 320 abuts against the recess 121, blocking water vapor in the axial and radial directions of the coil skeleton 100, preventing water vapor from entering the winding 101 along the gap between the plastic shell 200 and the coil skeleton 100, further improving the sealing effect, making the electromagnetic coil suitable for various complex working environments, and effectively extending the service life of the electromagnetic coil.

[0045] In this embodiment, the housing 400 is disposed outside the overmolded shell 200 , which can be understood as follows: after the coil bobbin 100 is overmolded, the outer portion of the coil bobbin 100 forms the overmolded shell 200 , and then the housing 400 is assembled outside the overmolded shell 200 .

[0046] Optionally, along the axial direction of the coil bobbin 100, at least a portion of the overmolded shell 200 is located between the coil bobbin 100 and the outer shell 400. The coil bobbin 100 has a receiving groove 310 for accommodating the sealing portion 320. The walls forming the receiving groove 310 include the walls of the recess 121 and at least a portion of the walls of the overmolded shell 200. The sealing portion 320 is effectively positioned within the receiving groove 310, which can ensure that the position of the sealing portion 320 is more stable, ensuring that the sealing portion 320 can effectively seal the gap between the overmolded shell 200 and the coil bobbin 100, and improving the sealing performance of the sealing portion 320.

[0047] In this embodiment, the sealing portion 320 is a sealing ring made of rubber. The rubber sealing ring has good elasticity and compressibility, and can fit tightly to the bottom wall and side walls of the accommodating groove 310, effectively preventing the infiltration of water vapor and pollutants.

[0048] Alternatively, as Figure 3 and Figure 4As shown, the coil skeleton 100 includes a winding tube 110 and two flanges 120. Flanges 120 are respectively provided at both ends of the winding tube 110. A groove 221 is provided on at least one end of the plastic shell 200. A recess 121 is provided on the flange 120. The recess 121 is opposite to the groove 221. The recess 121 and the groove 221 are jointly arranged to form a receiving groove 310, ensuring that the sealing portion 320 is stably positioned on the coil skeleton 100, and can effectively prevent water vapor from entering the winding 101 along the gap between the plastic shell 200 and the coil skeleton 100, thereby enhancing the protection capability of the electromagnetic coil in a humid environment.

[0049] Optionally, the two ends of the winding tube 110 are respectively detachably connected to the flange 120, which facilitates the installation and disassembly of the coil skeleton 100 and improves the disassembly efficiency of the coil skeleton 100; in other embodiments, the winding tube 110 and the flange 120 are an integrated structure, which can improve the overall structural strength of the coil skeleton 100.

[0050] In this embodiment, the receiving groove 310 is an annular receiving groove, which facilitates the placement of the sealing ring, makes the installation process more convenient and quick, reduces the risk of misalignment, and the annular receiving groove cooperates with the sealing ring to achieve a better sealing effect.

[0051] For example, grooves 221 are respectively provided at the two ends of the overmolded shell 200, and a recess 121 is provided on the flange 120 corresponding to each groove 221. Each groove 221 and the recess 121 on the corresponding flange 120 are arranged to form a receiving groove 310, and a sealing portion 320 is embedded in each receiving groove 310, which can provide a reliable sealing effect at both ends of the coil skeleton 100, ensuring that water vapor cannot easily enter along the gap between the overmolded shell 200 and the coil skeleton 100, thereby enhancing the protection capability of the electromagnetic coil in a humid environment.

[0052] In one embodiment, if Figure 5 As shown, the overmolded shell 200 is provided with a groove 221, and the outer shell 400 corresponding to the groove 221 is provided with a recess 121. Each groove 221 and the recess 121 on the outer shell 400 corresponding to it are arranged to form a receiving groove 310. A sealing portion 320 is embedded in each receiving groove 310, which can also form a more reliable sealing effect at both ends of the coil skeleton 100, ensuring that water vapor cannot easily enter along the gap between the overmolded shell 200 and the coil skeleton 100, thereby enhancing the protection capability of the electromagnetic coil in a humid environment.

[0053] In another embodiment, if Figure 6As shown, the overmolded shell 200 is provided with a groove 221, and the flange 120 corresponding to the groove 221 has a recess 121. The outer shell 400 is also provided with a recess 121. The two opposing recesses 121 and the groove 221 together form a receiving groove 310. A sealing portion 320 is embedded in the receiving groove 310 to provide a more reliable sealing effect.

[0054] Example 2

[0055] This embodiment provides an electromagnetic coil, which is basically the same as the electromagnetic coil in Example 1. The difference from Example 1 is that a protrusion 330 is provided on the side of at least one flange 120 facing away from the winding tube 110. Along the radial direction of the coil skeleton 100, the protrusion 330 is located on the outside of the accommodating groove 310. The design of the protrusion 330 effectively extends the entry path of water vapor, increases the difficulty of water vapor penetration, and further improves the waterproof performance of the electromagnetic coil.

[0056] In this embodiment, two protrusions 330 are provided on the side of the flange 120 facing away from the winding tube 110. In other embodiments, the number of protrusions 330 can be adaptively changed according to waterproof requirements, for example, three, four, five protrusions 330 can be provided.

[0057] Optionally, the cross section of the protrusion 330 is one of a triangle, a rectangle, and a trapezoid. Protrusions 330 of these shapes can more effectively extend the path for water vapor to enter, reduce the risk of water vapor penetration, and improve the overall waterproof capability of the electromagnetic coil.

[0058] In this embodiment, the protrusion 330 is an annular protrusion 330 , which forms a continuous waterproof barrier, can provide all-round protection between the bobbin 110 and the flange 120 , and effectively prevent water vapor from radially penetrating the coil bobbin 100 .

[0059] Example 3

[0060] This embodiment provides an electromagnetic coil that is basically the same as the electromagnetic coil in Example 1. The difference from Example 1 is that a waterproof groove 340 is provided on the circumferential surface of at least one flange 120, which extends the water vapor penetration path and increases the difficulty of water vapor entering the winding 101, thereby enhancing the sealing of the electromagnetic coil.

[0061] Specifically, according to the thickness of the flange 120, one, two, three, four or five waterproof grooves 340 can be set on the circumferential surface of the flange 120. Multiple waterproof grooves 340 are arranged at intervals on the circumferential surface of the flange 120 along the axial direction of the flange 120, forming a multiple protective barrier, effectively blocking water vapor penetration and significantly improving the waterproof performance.

[0062] Optionally, the cross-sectional shape of the waterproof groove 340 is one of V-shaped, U-shaped, trapezoidal, and "凵"-shaped. The shape of the waterproof groove 340 can be selected according to the actual working environment and usage conditions of the electromagnetic coil to better meet the waterproof requirements.

[0063] Exemplarily, in this embodiment, a waterproof groove 340 is provided on the circumferential surface of the flange 120. The waterproof groove 340 is an annular waterproof groove, and the cross-section of the annular waterproof groove is V-shaped, providing a good waterproof effect and significantly reducing the risk of water vapor entering the winding 101.

[0064] Embodiment Four

[0065] As Figure 7 and Figure 8 shown, this embodiment provides an electromagnetic coil, which is basically the same as the electromagnetic coil in Embodiment One. The difference from Embodiment One is that at least one convex 330 is provided on the side of the flange 120 facing away from the bobbin 110, and a waterproof groove 340 is provided on the circumferential surface of the flange 120. The double waterproof structure can further improve the waterproof effect.

[0066] Embodiment Five

[0067] This embodiment provides an electromagnetic coil, which is basically the same as the electromagnetic coil in Embodiment One. The difference from Embodiment One is that at least one welding rib 350 is provided on the outer peripheral surface of the flange 120, and the welding rib 350 is integrally connected with the plastic shell 200. The setting of the welding rib 350 makes the connection between the flange 120 and the plastic shell 200 more firm, avoids the separation of the coil skeleton 100 and the plastic shell 200 caused by thermal expansion and contraction, reduces the gap between the flange 120 and the plastic shell 200, and reduces the possibility of water vapor penetration, further improving the waterproof effect of the electromagnetic coil.

[0068] Exemplarily, in this embodiment, a welding rib 350 is provided on the outer peripheral surfaces of both flanges 120, and each welding rib 350 is integrally connected with the plastic shell 200. In other embodiments, the number of welding ribs 350 can be set according to actual usage requirements, for example, two, three, four, five welding ribs 350 are provided on the outer peripheral surface of the flange 120, etc. The number of welding ribs 350 is not specifically limited.

[0069] Embodiment Six

[0070] As Figure 9 and Figure 10As shown, this embodiment provides an electromagnetic coil, which is basically the same as Example 1. The difference from Example 1 is that a protrusion 330 is provided on the side of the flange 120 facing away from the winding tube 110, and the protrusion 330 is located on the outside of the accommodating groove 310 along the radial direction of the coil skeleton 100. At the same time, a waterproof groove 340 and / or a welding rib 350 are provided on the circumferential surface of the flange 120, forming multiple protections, which can effectively block water vapor penetration and significantly improve the waterproof performance of the electromagnetic coil.

[0071] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An electromagnetic coil, characterized in that Comprising: A coil bobbin (100) with a winding (101) provided thereon; A plastic-coated shell (200) covering the outside of the coil bobbin (100); An outer shell (400) disposed outside the plastic-coated shell (200); The outer shell (400) and / or the coil bobbin (100) has a recess (121), at least one end of the coil bobbin (100) is provided with a sealing portion (320), at least part of the sealing portion (320) is located in the recess (121), along the axial direction of the coil bobbin (100), the sealing portion (320) is pressed by the coil bobbin (100) and the outer shell (400), and along the radial direction of the coil bobbin (100), at least part of the sealing portion (320) abuts against the recess (121).

2. The electromagnetic coil according to claim 1, wherein Along the axial direction of the coil bobbin (100), at least part of the plastic-coated shell (200) is located between the coil bobbin (100) and the outer shell (400), the coil bobbin (100) has a receiving groove (310) for accommodating the sealing portion (320), and the wall forming the receiving groove (310) includes the wall of the recess (121) and at least part of the wall of the plastic-coated shell (200).

3. The electromagnetic coil according to claim 2, characterized in that The coil bobbin (100) includes a bobbin (110) and two flange plates (120), the two ends of the bobbin (110) are respectively connected to the flange plates (120) or the bobbin (110) and the flange plates (120) are of an integral structure, and at least one end of the plastic-coated shell (200) is provided with a groove portion (221); The recess (121) is located on the flange plate (120) and / or the outer shell (400), and the recess (121) is opposite to the groove portion (221), and the groove portion (221) and the recess (121) jointly enclose to form the receiving groove (310).

4. The electromagnetic coil according to claim 3, characterized in that The receiving groove (310) is an annular receiving groove.

5. The electromagnetic coil according to claim 3, characterized in that At least one side of the flange plate (120) facing away from the bobbin (110) is provided with a protrusion (330), and along the radial direction of the flange plate (l20), the protrusion (330) is located outside the receiving groove (310).

6. The electromagnetic coil according to claim 5, characterized in that The cross-section of the protrusion (330) is one of a triangle, a rectangle, and a trapezoid.

7. The electromagnetic coil according to claim 5, characterized in that At least one circumferential surface of the flange plate (120) is provided with a waterproof groove (340), and along the radial direction of the flange plate (120), the waterproof groove (340) is located outside the receiving groove (310).

8. The electromagnetic coil according to claim 7, characterized in that The cross-sectional shape of the waterproof groove (340) is one of a V shape, a U shape, a trapezoid, and a "凵" shape.

9. The electromagnetic coil according to claim 5, characterized in that At least one outer circumferential surface of the flange plate (120) is provided with a welding rib (350), and the welding rib (350) is integrally connected to the plastic-coated shell (200).

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