Electromagnetic coil

Abstract

The electromagnetic coil comprises a winding frame, a winding coil, a magnetic conductive shell, a magnetic conductive plate and a guide pin, at least part of the winding coil is arranged in a wire containing groove of the winding frame, an end boss is arranged on a wire blocking disc located on one side of the winding coil, and the guide pin is arranged on the end boss; a wire passing groove is formed in the position, adjacent to the end boss, of the wire blocking disc, wire blocking parts are arranged on the two sides of a groove opening of the wire passing groove respectively, the two wire blocking parts extend in the opposite directions, and a wire passing gap is formed between the extending ends of the two wire blocking parts. By means of the arrangement, after winding is completed, the inner wire end and the outer wire end of the coil can penetrate through the wire passing gap between the two wire blocking parts, stretch upwards and are wound on the corresponding guide pins respectively, and wires in the wire passing grooves can be prevented from being disengaged; in addition, corresponding limiting is formed through the wire blocking part, and it is guaranteed that the inner wire end and the outer wire end are reliably arranged in the wire passing groove and reliably attached to the end boss. By applying the scheme, the inner wire end and the outer wire end can be prevented from passing through the outer edge of the wire blocking disc to generate suspension, and the risk of wire breakage is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and particularly to an electromagnetic coil. Background Art

[0002] A typical electromagnetic coil mainly includes a bobbin, a winding coil, a magnetic conductive shell, a magnetic conductive plate and a lead pin. Among them, a wire groove is formed between the two end face discs of the bobbin, and the lead pin is fixedly arranged on the end convex platform outside one of the end face discs. The enameled wire is wound and shaped in the wire groove of the bobbin to form a winding coil. The two ends of the wire led out from the winding coil are respectively assembled and conducted with two lead pins fixedly arranged on the end convex platform. The cavity formed by enclosing the magnetic conductive shell and the magnetic conductive plate is used to accommodate the bobbin and the winding coil and provide an electromagnetic conduction path. When the lead pin is energized, the current passes through the winding coil, and a magnetic field is generated according to the principle of electromagnetic induction to drive the opening or closing of the valve.

[0003] Generally, two wire grooves are formed in the end face disc of the bobbin 1 so that the inner wire head (starting end of winding) and the outer wire head (ending end of winding) of the winding coil can pass through the wire grooves and be wound around the corresponding lead pins. However, when the outer diameter of the winding coil is too large, there is a certain distance between its outer circle and the end convex platform, and the outer wire head cannot be reliably attached to the end convex platform, resulting in the outer wire head being hung in the air or slipping out of the wire groove, and there is a risk of poor insulation and open circuit. If manual wire routing is used, the wire can be ensured to enter the groove to a certain extent, but the operation efficiency is low. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an electromagnetic coil, which can effectively avoid the inner and outer wire heads of the winding from being hung in the air or slipping out during wire passing.

[0005] The present invention provides an electromagnetic coil, including a bobbin, a winding coil, a magnetic conductive shell, a magnetic conductive plate and lead pins. The magnetic conductive shell is in a cylindrical shape with an open end. The magnetic conductive plate is fitted and attached to the open end of the magnetic conductive shell and encloses to form an internal cavity. The bobbin includes a middle cylinder body and stop discs respectively arranged at both ends of the middle cylinder body. The two stop discs and the outer surface of the middle cylinder body form a wire groove, and at least part of the winding coil is placed in the wire groove. The winding coil and the bobbin are placed inside the internal cavity. An end convex platform is arranged on the stop disc on one side of the winding coil. The lead pins include a first lead pin and a second lead pin, and the first lead pin and the second lead pin are arranged at intervals on the end convex platform. A wire groove is formed in the stop disc adjacent to the end convex platform. The inner wire head of the winding coil is conducted with the first lead pin through the wire groove, and the outer wire head of the winding coil is conducted with the second lead pin through the wire groove. Wire blocking parts are respectively arranged on both sides of the notch of the wire groove. The two wire blocking parts extend towards each other, and there is a wire passing gap between the extending ends of the two wire blocking parts.

[0006] Compared with the background art, in this solution, through the wire blocking part provided based on the wire trough, after winding, the inner and outer wire ends of the coil can pass through the wire passing gap between the two wire blocking parts, be stretched upward and respectively wound around the corresponding guide pins. On the one hand, it can limit the escape of the wire in the wire trough. In addition, when the outer diameter of the winding coil is too large, corresponding limits can be formed through the wire blocking part to ensure that the inner wire end and the outer wire end are reliably placed in the wire trough and are reliably attached to the end boss. Applying this solution can avoid the inner wire end and the outer wire end passing through the outer edge of the wire blocking disc to form a suspension, effectively avoiding the risk of wire breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the overall structure of an electromagnetic coil provided by an embodiment of the present application;

[0008] Figure 2 is Figure 1 Another perspective schematic diagram of the electromagnetic coil shown in

[0009] Figure 3 is Figure 1 The assembly relationship schematic diagram of the wire winding frame and the winding coil of the electromagnetic coil shown in

[0010] Figure 4 is Figure 3 The enlarged view of part Ⅰ in

[0011] Figure 5 It is a schematic diagram of the structure of another wire winding frame provided by an embodiment of the present application;

[0012] Figure 6 is Figure 5 The enlarged view of part Ⅱ in

[0013] Figure 7 It is a schematic diagram of the overall structure of yet another electromagnetic coil provided by an embodiment of the present application;

[0014] Figure 8 It is a schematic diagram of the processing flow of an electromagnetic coil provided by an embodiment of the present application.

[0015] In the figure:

[0016] Electromagnetic coil 10, wire winding frame 1, wire blocking disc 11, wire trough 111, wire blocking part 112, cylinder body 12, end boss 13, winding coil 2, inner wire end 21, outer wire end 22, magnetic conduction shell 3, through port 31, avoidance port 32, magnetic conduction plate 4, guide pin 5, first guide pin 51, second guide pin 52;

[0017] Wire winding frame 10a, chamfering part 113a;

[0018] Electromagnetic coil 10b, magnetic conduction shell 3b, avoidance port 32b, magnetic conduction plate 4b, through port 41b. Detailed implementation mode

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Please refer to Figure 1 and Figure 2 , wherein, this figure is a schematic diagram of the overall structure of an electromagnetic coil provided by an embodiment of the present application. Figure 2 is Figure 1 Another perspective schematic diagram of the electromagnetic coil shown.

[0021] The electromagnetic coil 10 mainly includes a winding frame 1, a winding coil 2, a magnetic conduction shell 3, a magnetic conduction plate 4 and a lead pin 5. As Figure 1 shown, the magnetic conduction shell 3 is integrally cylindrical and has an open end, and the magnetic conduction plate 4 is fitted and matched with the open end of the magnetic conduction shell 3 to enclose a magnetic flux structure with an internal cavity. Here, the magnetic conduction plate 4 and the magnetic conduction shell 3 can be fitted and matched without gaps to increase the contact area between the two and improve the electromagnetic conduction efficiency.

[0022] In specific implementation, a tight fit and press connection can be adopted between the magnetic conduction plate 4 and the open end of the magnetic conduction shell 3, that is to say, the dimensional tolerance of the open end of the magnetic conduction plate 4 and the magnetic conduction shell 3 is configured as an interference fit and fixed by a press-fitting auxiliary tool. In other specific implementations, the magnetic conduction plate 4 and the open end of the magnetic conduction shell 3 can also be fixed by processes such as welding, gluing or riveting.

[0023] As Figure 2 and Figure 3 shown, two wire blocking disks 11 are respectively arranged at both ends of the middle cylinder 12 of the winding frame 1, and a wire receiving groove is formed between the two wire blocking disks 11 and the outer surface of the middle cylinder 12. The enameled wire is wound in the wire receiving groove of the winding frame 1 to form a winding coil 2. In specific implementation, the winding coil 2 can be wholly or partially placed in the wire receiving groove.

[0024] The wire blocking disk 11 shown in the figure is integrally in the shape of an annular disk and has good processability. In other specific implementations, the wire blocking disk 11 can be of other shape structures and is not limited to the annular disk shape shown in the figure.

[0025] The inner lead 21 and the outer lead 22 of the winding coil 2 are respectively connected to the corresponding lead pins 5. The lead pins 5 include a first lead pin 51 and a second lead pin 52. The inner lead 21 is conductively connected to the first lead pin 51, and the outer lead 22 is conductively connected to the second lead pin 52. Here, the inner lead 21 refers to the starting end wire of the winding, and the outer lead 22 refers to the ending end wire of the winding.

[0026] In practical applications, the guide pin 5 can be electrically connected to a circuit control board (not shown in the figure). In this way, when the guide pin is energized, current passes through the winding coil 2, and a magnetic field is generated according to the principle of electromagnetic induction, which can drive the opening or closing of a valve (not shown in the figure).

[0027] Wherein, an end boss 13 is provided on the wire blocking disk 11 on one side of the winding coil 2, and the first guide pin 51 and the second guide pin 52 are arranged at intervals on the end boss 13 to achieve reliable fixation of the two first guide pins 51 and the second guide pin 52. In a specific implementation, the winding frame 1 can be made of an insulating material with a certain strength. Exemplarily, it can be processed by injection molding to fix the guide pin 5 at the same time.

[0028] Please refer to Figure 3 and Figure 4 as shown, wherein Figure 4 is Figure 3 the enlarged view of part I in

[0029] As shown in the figure, a wire passing groove 111 is formed in the wire blocking disk 11 adjacent to the end boss 13, so that the inner wire head 21 and the outer wire head 22 can pass through the wire passing groove 111 and be assembled and adapted to the corresponding guide pins. The wire passing groove 111 extends along the winding direction to accommodate the inner wire head 21 and the outer wire head 22 arranged at intervals.

[0030] On both sides of the notch of the wire passing groove 111, wire blocking parts 112 are provided. The two wire blocking parts 112 extend towards each other, and there is a wire passing gap L between the extending ends of the two wire blocking parts 112. In a specific implementation, the wire passing gap L should meet the dimensional requirements for the passage of the wire. Exemplarily, the wire passing gap L is not greater than the outer diameter dimension of the wire. With such a setting, after winding, the inner wire head 21 and the outer wire head 22 can pass through the wire passing gap L between the two wire blocking parts 112, be stretched upwards and respectively wound around the corresponding guide pins; on the one hand, based on the setting of the wire blocking parts 112, the wires (inner wire head 21 and outer wire head 22) in the wire passing groove 111 can be restricted from coming out; in addition, when the outer diameter of the winding coil 2 is too large, corresponding limits can be formed through the wire blocking parts 112 to ensure that the inner wire head 21 and the outer wire head 22 are reliably placed in the wire passing groove 111 and fit tightly with the end boss.

[0031] Applying this solution can avoid the inner wire head 21 and the outer wire head 22 passing over the outer edge of the wire blocking disk 11 to form a suspension, effectively avoiding the risk of wire breakage.

[0032] Optionally, in order to further facilitate and quickly realize the stretching operation of passing the inner wire head 21 and the outer wire head 22 through, as Figure 4 shown, the extending ends of the wire blocking parts 112 have inwardly retracted rounded parts 113, so that the inner wire head 21 and the outer wire head 22 can pass through the wire passing gap between the two wire blocking parts 112, and at the same time avoid scratching the surface of the conductor during the passing and stretching process.

[0033] For another example Figure 2 As shown, in this embodiment, a through hole 31 is formed in the bottom wall of the magnetic conduction shell 3, and the end boss 13 of the winding bobbin 1 extends out of the inner cavity through the through hole 31. An avoidance hole 32 is formed in the side wall of the magnetic conduction shell 3 adjacent to the through hole 31, and the avoidance hole 32 communicates with the through hole 31. After the product winding is completed and assembled, due to the arrangement of the avoidance hole 32, an insulating distance is maintained between the magnetic conduction shell 3 and the inner lead 21 and the outer lead 22, and it can be avoided that the conductor is lapped with the magnetic conduction shell 3 resulting in poor insulation.

[0034] In a specific implementation, the structure of the wire blocking part 112 can be determined according to the overall design requirements of the product, rather than being limited to Figure 3 and Figure 4 the shown shape.

[0035] Please refer to Figure 5 and Figure 6 , wherein, Figure 5 FIG. is a schematic structural diagram of another winding bobbin provided by an embodiment of the present application, Figure 6 is Figure 5 the enlarged view of part II in. In order to clearly show the differences and connections between this embodiment and the foregoing embodiments, the components or structures with the same functions are denoted by the same reference numerals in the figures.

[0036] As shown in the figure, a wire passing groove 111 is formed in the wire blocking disk 11 adjacent to the end boss 13 of the winding bobbin 10a, so that the wire can pass through the wire passing groove 111 and be assembled and adapted to the corresponding guide pin. In this embodiment, the extending end of the wire blocking part 112 has an inwardly chamfered part 113a to guide the inner lead and the outer lead to quickly enter the wire passing groove 111, and the assembly processability can be further improved.

[0037] The other functional components and corresponding structures of this embodiment can be the same as those of the foregoing embodiments, and will not be described herein again.

[0038] In addition, the through hole for mounting the end boss 13 and the avoidance hole communicating with the through hole can be respectively arranged on the magnetic conduction shell and the magnetic conduction plate. Please refer to Figure 7 , which is a schematic diagram of the overall structure of another electromagnetic coil provided by an embodiment of the present application. In order to clearly show the differences and connections between this embodiment and the foregoing embodiments, the components or structures with the same functions are denoted by the same reference numerals in the figures.

[0039] The magnetic conduction plate 4b of the electromagnetic coil 10b is adapted to the magnetic conduction shell 3b to enclose a magnetic flux structure with an inner cavity. In this embodiment, the guide pin extends out of the inner cavity from the side of the magnetic conduction plate 4.

[0040] As shown in the figure, a through hole 41b is formed in the magnetic conductive plate 4b, and the end boss 13 of the winding bobbin 1 extends out of the inner cavity through the through hole 41b. An avoidance hole 32b is formed in the side wall of the magnetic conductive shell 3b adjacent to the through hole 41b, and the avoidance hole 32b communicates with the through hole 41b. Similarly, due to the arrangement of the avoidance hole 32, an insulating distance is maintained between the magnetic conductive shell 3b and the inner wire head 21 and the outer wire head 22, preventing the conductor from overlapping with the magnetic conductive shell 3b.

[0041] The following briefly describes the processing flow of the electromagnetic coil described in the foregoing embodiments in conjunction with Figure 8 :

[0042] First, the winding bobbin 1 is injection-molded, the guide pin 5 is assembled and fixed on the winding bobbin 1, and then the enameled wire is wound in the wire groove of the winding bobbin 1 to form a winding coil 2.

[0043] Next, the inner wire head 21 and the outer wire head 22 of the enameled wire are respectively welded and conducted with the corresponding guide pins 5 and placed into the magnetic conductive shell 3.

[0044] Finally, the magnetic conductive plate 4 and the magnetic conductive shell 3 are assembled and fixed to obtain the electromagnetic coil.

[0045] In a specific implementation manner, the assembly sequence of the guide pins 5 is not limited to the above process. For example, it can also be received during the injection molding of the winding bobbin 1, or it can also be received and assembled after the winding is completed or after the magnetic conductive shell is assembled.

[0046] In addition, the connection method between the inner wire head 21 and the outer wire head 22 and the guide pin can also be selected according to actual needs, rather than being limited to the winding and welding method.

[0047] The electromagnetic coil described in the foregoing embodiments can be applied to products such as air conditioners, water purifiers, coffee machines, etc. that are adapted to electromagnetic drive valve products.

[0048] It should be noted that the "first" and "second" ordinal numbers used in the above embodiments provided by this embodiment are used to distinguish the same functional components. It should be understood that the application of the above ordinal numbers is only used to distinguish different limited objects and does not constitute a substantial limitation to the electronic expansion valve claimed in this application.

[0049] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An electromagnetic coil, characterized in that, It includes a wire winding frame, a winding coil, a magnetic conduction shell, a magnetic conduction plate and a guide pin. The magnetic conduction shell is in a cylindrical shape with an open end. The magnetic conduction plate is fitted and mated with the open end of the magnetic conduction shell and encloses to form an internal cavity; The wire winding frame includes a middle cylinder body and wire blocking discs respectively arranged at both ends of the middle cylinder body. The two wire blocking discs and the outer surface of the middle cylinder body form a wire receiving groove, and at least part of the winding coil is placed in the wire receiving groove. The winding coil and the wire winding frame are placed inside the internal cavity. An end boss is arranged on the wire blocking disc on one side of the winding coil; The guide pin includes a first guide pin and a second guide pin, and the first guide pin and the second guide pin are arranged at intervals on the end boss; A wire passing groove is formed on the wire blocking disc adjacent to the end boss. The inner wire end of the winding coil is conducted with the first guide pin through the wire passing groove, and the outer wire end of the winding coil is conducted with the second guide pin through the wire passing groove. Wire blocking parts are respectively arranged on both sides of the notch of the wire passing groove. The two wire blocking parts extend towards each other, and there is a wire passing gap between the extending ends of the two; 2. The electromagnetic coil according to claim 1, wherein The extending end of the wire blocking part has an inwardly retracted rounded part.

3. The electromagnetic coil according to claim 1, characterized in that, The extending end of the wire blocking part has an inwardly retracted chamfered part.

4. The electromagnetic coil according to any one of claims 1 to 3, characterized in that The wire passing gap is not larger than the outer diameter sizes of the outer wire end and the inner wire end.

5. The electromagnetic coil according to claim 1, characterized in that, A passing port is formed on the bottom wall of the magnetic conduction shell, and the end boss of the wire winding frame extends out of the internal cavity through the passing port.

6. The electromagnetic coil according to claim 1, wherein, A passing port is formed on the magnetic conduction plate, and the end boss of the wire winding frame extends out of the internal cavity through the passing port.

7. The electromagnetic coil according to claim 5 or 6, characterized in that, An avoidance port is formed on the side wall of the magnetic conduction shell adjacent to the passing port, and the avoidance port is communicated with the passing port.

8. The electromagnetic coil according to claim 1, wherein, There is a tight fit and press connection between the magnetic conduction plate and the open end of the magnetic conduction shell.

9. The electromagnetic coil according to claim 1, characterized in that, The magnetic conduction plate and the open end of the magnetic conduction shell are welded, glued or riveted.

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