CN107833795B - Electromagnetic relay formed by injection molding of coil pin insert - Google Patents
Electromagnetic relay formed by injection molding of coil pin insert Download PDFInfo
- Publication number
- CN107833795B CN107833795B CN201711026653.7A CN201711026653A CN107833795B CN 107833795 B CN107833795 B CN 107833795B CN 201711026653 A CN201711026653 A CN 201711026653A CN 107833795 B CN107833795 B CN 107833795B
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- Prior art keywords
- coil
- insert injection
- guide groove
- leg
- electromagnetic relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/44—Magnetic coils or windings
- H01H50/443—Connections to coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/44—Magnetic coils or windings
- H01H2050/446—Details of the insulating support of the coil, e.g. spool, bobbin, former
Abstract
The invention discloses an electromagnetic relay formed by injection molding of a coil pin insert, which comprises a coil rack and coil pins, wherein the coil pins are arranged on the coil rack; the coil leg is a straight bar-shaped rod piece, the middle part of the coil leg is fixed in the coil rack in an insert injection molding mode, and the coil rack is provided with a through coil leg hole; the coil rack is also provided with a wire guide groove which is formed on the coil rack after demolding and molding by utilizing the wire guide ejector rod to position the coil pin during insert injection molding; the thread guide groove is U-shaped to surround the coil leg from three sides, the bottom edge of the U-shaped shape of the thread guide groove is provided with an opening leading to the outside, and the direction of the opening is perpendicular to the leg hole. The invention can position the coil pin through the guide wire ejector rod of the die, prevent the coil pin from deforming or shifting caused by the impact when molten plastic flows in the injection molding process, realize the high-precision positioning of the coil pin in the coil rack, ensure that the distance between the relay yoke iron assembled by the coil rack and the coil pin meets the design requirement, and further ensure that the medium pressure resistance meets the design requirement.
Description
Technical Field
The invention relates to an electromagnetic relay, in particular to an electromagnetic relay formed by injection molding of a coil pin insert.
Background
An electromagnetic relay generally includes a base, a coil including a bobbin and an enamel wire wound around the bobbin, an iron core, an armature, a yoke, a movable spring, a stationary spring, and the like, the bobbin being mounted on the base, the iron core being inserted into the bobbin, the yoke being fitted to the bobbin; the armature iron and the movable spring often form a movable spring armature iron part, the armature iron is matched at the knife edge of the yoke iron, the movable contact of the movable spring is matched with the fixed contact of the fixed spring, and when the coil works, the armature iron is attracted to the iron core and drives the movable contact of the movable spring to be contacted with the fixed contact of the fixed spring.
One end of a coil pin of the electromagnetic relay in the prior art is communicated with a coil enameled wire through arc welding, and the other end of the coil pin is led out to form a coil driving leading-out pin of the relay, the middle part of the coil pin of the electromagnetic relay is completely embedded in a coil frame, namely, an insert injection molding mode is adopted, the middle part of the coil pin is used as an insert for injection molding in the coil frame, the coil pin penetrates through the whole coil frame, so the designed length of the coil pin is longer, and the coil pin is easy to deform or shift due to impact when molten plastic flows when the insert is injected, so that the positioning of the coil pin in the coil frame is inaccurate, the distance between the coil pin and a yoke cannot be guaranteed, and the defect that the medium voltage resistance between the coil pin and the yoke cannot meet the design requirement easily occurs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an electromagnetic relay formed by insert injection molding of coil pins.
The technical scheme adopted by the invention for solving the technical problems is as follows: an electromagnetic relay with coil pin insert injection molding comprises a coil rack and coil pins; the coil leg is a straight bar-shaped rod piece, the middle part of the coil leg is fixed in the coil rack in an insert injection molding mode, and the coil rack is provided with a through-going coil leg hole so as to be adapted to the middle part of the coil leg; the coil former still is equipped with the seal wire ejector pin and fixes a position the coil foot and form the seal wire groove on the coil former after the drawing of patterns shaping when the inserts is moulded plastics, the seal wire groove for the U-shaped shape in order to follow trilateral package in the coil foot, the base of the U-shaped shape of this seal wire groove is established to the opening that leads to the outside, and open-ended direction with the stitch hole is perpendicular.
The opening of the U-shaped wire guide groove is opposite to the opening of the wire guide groove leading to the outside.
The opening of the thread guide groove leading to the outside is circular.
And a first plastic solid part formed during insert injection molding is arranged between the opening of the wire guide groove leading to the outside and the coil foot.
Two sides of the U-shaped shape of the yarn guide groove are inclined.
The two sides of the U-shaped shape of the thread guide groove are gradually increased towards the opening direction of the U-shaped opening.
And two sides of the U-shaped wire guide groove are respectively tangent to the coil feet, so that a second plastic solid part formed by insert injection molding is arranged between the two sides of the U-shaped wire guide groove and the coil feet.
The cross section of the coil leg is square.
The cross section of the coil pin is circular.
The coil rack is provided with an iron core hole for inserting the iron core, and the thread pin hole is vertical to the iron core hole.
The invention relates to an electromagnetic relay for insert injection molding of coil pins, which is characterized in that the coil pins are fixed in a coil rack to form the coil rack assembly in an insert injection molding mode, a corresponding number of the coil pins are inserted in the coil rack during injection molding, then the coil pins are limited by a guide wire ejector rod of a mold, the guide wire ejector rod is a long-strip round rod piece, one end for limiting is provided with a U-shaped bayonet, the guide wire ejector rod is clamped at one position of the middle part of the coil pins by the U-shaped bayonet, then molten plastic is injected into a cavity of the mold to form the shape of the coil rack, due to the limitation of the guide wire ejector rod on the coil pins, the coil pins can prevent impact when the molten plastic flows during the injection molding of the inserts, the guide wire ejector rod is separated out after the injection molding, a guide wire groove is formed at the position where the.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the wire guide groove which is formed on the coil frame after demoulding and forming by utilizing the wire guide ejector rod to position the coil foot when the coil frame is also provided with the insert for injection molding, the wire guide groove is U-shaped and is wrapped on the coil foot from three sides, the bottom edge of the U-shaped wire guide groove is provided with an opening leading to the outside, and the direction of the opening is vertical to the central line of the coil foot hole. The structure of the invention can position the coil pin through the guide wire ejector rod of the die, prevent the coil pin from deforming or shifting caused by the impact when molten plastic flows in the injection molding process, thereby realizing the high-precision positioning of the coil pin in the coil rack, ensuring that the distance between the relay yoke assembled by the coil rack and the coil pin meets the design requirement, and ensuring that the medium pressure resistance meets the design requirement.
2. According to the invention, two sides of the U-shaped wire guide groove are respectively tangent to the coil feet, so that a first plastic solid part formed during insert injection molding is arranged between the opening of the wire guide groove leading to the outside and the coil feet, a second plastic solid part formed during insert injection molding is arranged between the two sides of the U-shaped wire guide groove and the coil feet, and the coil feet are wrapped by the first plastic solid part and the second plastic solid part from three sides, so that metal scrap impurities cannot contact with the coil feet when entering the wire guide groove, and the medium pressure resistance between the coil feet and the yoke iron can be ensured to meet the requirement.
The invention is further explained in detail with the accompanying drawings and the embodiments; however, the electromagnetic relay in which the coil pin of the present invention is insert-molded is not limited to the embodiment.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a top view of an embodiment of the present invention;
fig. 3 is a schematic configuration diagram of a coil leg embodying the present invention;
FIG. 4 is a schematic diagram illustrating the position of a guide wire ejector pin to a coil foot of the die of the present invention;
FIG. 5 is a schematic view of insert injection molding according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of an insert injection molding embodiment of the present invention;
FIG. 7 is an enlarged schematic view of section A of FIG. 6;
FIG. 8 is a schematic illustration of a guidewire mandrel being withdrawn in accordance with embodiments of the present invention;
fig. 9 is a sectional view of a bobbin embodying the present invention;
fig. 10 is an enlarged schematic view of a portion B in fig. 9.
Detailed Description
Examples
Referring to fig. 1 and 2, an electromagnetic relay formed by insert molding of coil pins according to the present invention includes a base 1, a coil frame 2, coil pins 3, a yoke 4, a movable spring and armature member 5, and a stationary spring 6; the coil frame 2, the yoke iron 4 and the static spring 6 are respectively arranged in the base 1, the armature of the movable spring armature part 5 is correspondingly matched at the knife edge of the yoke iron 4, and the movable spring point of the movable spring armature part 5 and the static contact point of the static spring 6 are in a matched position.
Referring to fig. 3 to 10, the coil leg 3 is a straight bar-shaped rod, the middle part of the coil leg 3 is fixed in the coil frame 2 by insert injection molding, and the coil frame 2 is provided with a through-hole 21 to be adapted to the middle part of the coil leg 3; coil former 2 still is equipped with when the inserts is moulded plastics and utilizes seal wire ejector pin 7 to fix a position the coil foot and form the wire guide groove 22 on the coil former after drawing of patterns shaping, wire guide groove 22 for the U-shaped form in order to follow trilateral package in coil foot 3, the base of the U-shaped shape of this wire guide groove 22 is established to leading to outside opening 221, and the direction of opening 221 with the central line looks perpendicular of stitch hole 21.
In this embodiment, the opening 222 of the U-shaped opening of the U of the guide wire channel 22 is opposite to the opening 221 of the guide wire channel which opens to the outside.
In the present exemplary embodiment, the opening 221 of the guide wire groove leading to the outside is circular.
In this embodiment, a first plastic solid portion 223 formed during insert molding is further provided between the opening 221 of the guide wire groove leading to the outside and the coil leg 3.
In this embodiment, the two sides 224 of the U-shape of the guide groove 22 are inclined.
In this embodiment, the two sides 224 of the U-shape of the guide wire groove 22 gradually increase in the direction of the opening 222 of the U-shape.
In this embodiment, two sides 224 of the U-shape of the guide groove 22 are respectively tangent to the coil leg 3, so that a second plastic solid portion 225 formed during insert injection is further disposed between the two sides 224 of the U-shape of the guide groove 22 and the coil leg 3.
In this embodiment, the cross section of the coil leg 3 is square. Of course, the cross section of the coil leg 3 can also be provided as a circle.
In the present embodiment, the bobbin 2 has a core hole 23 for inserting a core, and the bobbin hole 21 is perpendicular to the core hole 23.
The invention relates to an electromagnetic relay with coil pin insert injection molding, which fixes a coil pin 3 in a coil rack 2 by adopting an insert injection molding mode to form a coil rack component, during injection molding, a corresponding number of coil pins 3 are inserted, then the coil pins 3 are limited by a guide wire ejector rod 7 of a mold, the guide wire ejector rod 7 is a long round rod piece, one end for limiting is provided with a U-shaped bayonet 71, the guide wire ejector rod 7 is clamped at a position of the middle part of the coil pins 3 by utilizing the U-shaped bayonet 71, then molten plastic is injected into a cavity of the mold to form the shape of a coil rack, due to the fact that the wire guide ejector rod 7 limits the coil pin 3, the coil pin 3 can prevent impact when molten plastic flows when the insert is molded in an injection mode, the wire guide ejector rod 7 is separated after the insert is molded in the injection mode, the wire guide groove 22 is formed in the position where the wire guide ejector rod 7 is separated, and the wire guide groove 22 is of a three-side surrounding structure.
Referring to fig. 7, inclined planes 711 are provided on two sides of the U-shaped bayonet 71 of the guide wire ejector rod 7, that is, at the position where the coil leg 3 is clamped, and after the mold is closed, the guide wire ejector rod 7 moves to a set position to protect three sides of the coil leg 3. In the injection molding process, when the coil pin 3 is deformed or displaced due to the impact of molten plastic, the inclined surface 711 of the ejector rod 7 is in line contact with the edge of the coil pin 3, so that the deformation or displacement of the coil pin 3 is limited. Because the ejector rod 7 is in linear contact with the edge of the coil pin 3, and the rest parts are cavities, in the injection molding process, the cavity part is filled with plastic, and after injection molding, the ejector rod 7 is withdrawn, so that a first plastic solid part 223 and a second plastic solid part 225 are formed on the periphery of the coil pin 3, as shown in fig. 10, the coil pin 3 is wrapped by the first plastic solid part 223 and the second plastic solid part 225 from three sides, and the plastic of the part can ensure that metal chip impurities cannot be in contact with the coil pin 3 when entering the wire guide groove 22, so that the medium pressure resistance between the coil pin 3 and the yoke can meet the requirement.
The invention relates to an electromagnetic relay formed by insert injection molding of coil feet, which adopts a wire guide groove 22 formed on a coil frame after demolding molding by utilizing a wire guide ejector rod 7 to position the coil feet when the coil frame 2 is provided with insert injection molding, wherein the direction of an opening 221 of the wire guide groove 22 leading to the outside is vertical to a coil foot hole 21, and the wire guide groove 22 is U-shaped and is wrapped on the coil feet 3 from three sides. The structure of the invention can position the coil leg 3 through the guide wire ejector rod 7 of the mould, prevent the coil leg 3 from deforming or shifting because of the impact when the molten plastic flows in the injection molding process, thus can realize the high-precision positioning of the coil leg in the coil frame 2, ensure the distance between the relay yoke assembled by the coil frame and the coil leg to meet the design requirement (as shown in figure 2), and ensure the medium pressure resistance to meet the design requirement.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. An electromagnetic relay with coil pin insert injection molding comprises a coil rack and coil pins; the coil leg is a straight bar-shaped rod piece, the middle part of the coil leg is fixed in the coil rack in an insert injection molding mode, and the coil rack is provided with a through-going coil leg hole so as to be adapted to the middle part of the coil leg; the method is characterized in that: the coil former still is equipped with the seal wire ejector pin and fixes a position the coil foot and form the seal wire groove on the coil former after the drawing of patterns shaping when the inserts is moulded plastics, the seal wire groove for the U-shaped shape in order to follow trilateral package in the coil foot, the base of the U-shaped shape of this seal wire groove is established to the opening that leads to the outside, and open-ended direction with the stitch hole is perpendicular.
2. The coil leg insert injection molded electromagnetic relay according to claim 1, characterized in that: the opening of the U-shaped wire guide groove is opposite to the opening of the wire guide groove leading to the outside.
3. The coil leg insert injection molded electromagnetic relay according to claim 2, characterized in that: the opening of the thread guide groove leading to the outside is circular.
4. The coil leg insert injection molded electromagnetic relay according to claim 2 or 3, characterized in that: and a first plastic solid part formed during insert injection molding is arranged between the opening of the wire guide groove leading to the outside and the coil foot.
5. The coil leg insert injection molded electromagnetic relay according to claim 1, characterized in that: two sides of the U-shaped shape of the yarn guide groove are inclined.
6. The coil leg insert injection molded electromagnetic relay according to claim 5, characterized in that: the two sides of the U-shaped shape of the thread guide groove are gradually increased towards the opening direction of the U-shaped opening.
7. The coil leg insert injection molded electromagnetic relay according to claim 6, characterized in that: and two sides of the U-shaped wire guide groove are respectively tangent to the coil feet, so that a second plastic solid part formed by insert injection molding is arranged between the two sides of the U-shaped wire guide groove and the coil feet.
8. The coil leg insert injection molded electromagnetic relay according to claim 1, characterized in that: the cross section of the coil leg is square.
9. The coil leg insert injection molded electromagnetic relay according to claim 1, characterized in that: the cross section of the coil pin is circular.
10. The coil leg insert injection molded electromagnetic relay according to claim 1, characterized in that: the coil rack is provided with an iron core hole for inserting the iron core, and the thread pin hole is vertical to the iron core hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026653.7A CN107833795B (en) | 2017-10-27 | 2017-10-27 | Electromagnetic relay formed by injection molding of coil pin insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026653.7A CN107833795B (en) | 2017-10-27 | 2017-10-27 | Electromagnetic relay formed by injection molding of coil pin insert |
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| Publication Number | Publication Date |
|---|---|
| CN107833795A CN107833795A (en) | 2018-03-23 |
| CN107833795B true CN107833795B (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711026653.7A Active CN107833795B (en) | 2017-10-27 | 2017-10-27 | Electromagnetic relay formed by injection molding of coil pin insert |
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|---|---|---|---|---|
| CN1697112A (en) * | 2005-05-19 | 2005-11-16 | 厦门宏发电声有限公司 | Coil component of electromagnetic relay |
| EP1615251A1 (en) * | 2004-07-07 | 2006-01-11 | Tyco Electronics AMP GmbH | Relay, in particular for a plug installation, and method for the production thereof |
| CN201527934U (en) * | 2009-09-22 | 2010-07-14 | 厦门宏发电声股份有限公司 | Electromagnetic relay |
| CN103996527A (en) * | 2014-05-30 | 2014-08-20 | 四川省科威电工有限责任公司 | Coil injection mold |
| CN203850221U (en) * | 2014-05-15 | 2014-09-24 | 厦门宏发电声股份有限公司 | Electromagnetic relay coil frame |
| CN205452189U (en) * | 2015-12-24 | 2016-08-10 | 浙江正泰电器股份有限公司 | Ac contactor's coil skeleton |
| CN205609446U (en) * | 2016-04-14 | 2016-09-28 | 厦门宏发电声股份有限公司 | Relay base structure |
| CN106206166A (en) * | 2016-08-29 | 2016-12-07 | 厦门宏发信号电子有限公司 | A kind of electromagnetic relay being molded yoke |
| CN106340425A (en) * | 2015-07-13 | 2017-01-18 | 浙江正泰电器股份有限公司 | Connecting structure for voltage input of relay coil, and processing method of connecting structure |
| CN106920713A (en) * | 2015-12-24 | 2017-07-04 | 浙江正泰电器股份有限公司 | The coil rack of A.C. contactor |
| CN207719108U (en) * | 2017-10-27 | 2018-08-10 | 厦门宏发汽车电子有限公司 | The electromagnetic relay of coil foot insert injection molding |
-
2017
- 2017-10-27 CN CN201711026653.7A patent/CN107833795B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1615251A1 (en) * | 2004-07-07 | 2006-01-11 | Tyco Electronics AMP GmbH | Relay, in particular for a plug installation, and method for the production thereof |
| CN1697112A (en) * | 2005-05-19 | 2005-11-16 | 厦门宏发电声有限公司 | Coil component of electromagnetic relay |
| CN201527934U (en) * | 2009-09-22 | 2010-07-14 | 厦门宏发电声股份有限公司 | Electromagnetic relay |
| CN203850221U (en) * | 2014-05-15 | 2014-09-24 | 厦门宏发电声股份有限公司 | Electromagnetic relay coil frame |
| CN103996527A (en) * | 2014-05-30 | 2014-08-20 | 四川省科威电工有限责任公司 | Coil injection mold |
| CN106340425A (en) * | 2015-07-13 | 2017-01-18 | 浙江正泰电器股份有限公司 | Connecting structure for voltage input of relay coil, and processing method of connecting structure |
| CN205452189U (en) * | 2015-12-24 | 2016-08-10 | 浙江正泰电器股份有限公司 | Ac contactor's coil skeleton |
| CN106920713A (en) * | 2015-12-24 | 2017-07-04 | 浙江正泰电器股份有限公司 | The coil rack of A.C. contactor |
| CN205609446U (en) * | 2016-04-14 | 2016-09-28 | 厦门宏发电声股份有限公司 | Relay base structure |
| CN106206166A (en) * | 2016-08-29 | 2016-12-07 | 厦门宏发信号电子有限公司 | A kind of electromagnetic relay being molded yoke |
| CN207719108U (en) * | 2017-10-27 | 2018-08-10 | 厦门宏发汽车电子有限公司 | The electromagnetic relay of coil foot insert injection molding |
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| CN107833795A (en) | 2018-03-23 |
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