TW201624506A - Fuse resistor and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fuse resistor and a manufacturing method thereof. More particularly, it is installed in the electric circuit of an electronic produce and prevents device error caused by continuous overcurrent, increase in internal temperature, inrush current. A molding part is formed by insert injection. Because a temperature fuse is combined with first and second ends by combining a case combined with the temperature fuse with an insertion groove combination method, assembly process is simplified and contact error can be prevented.

Description

Fuse resistor and method of manufacturing same

The present invention relates to a fuse resistor and a method of manufacturing the same, and more particularly to a machine fault which is provided in a circuit of an electronic product to prevent a surge current, an increase in internal temperature, a continuous overcurrent, etc., and is formed by injection molding. Forming portion, and embedding the housing combined with the thermal fuse into the insertion groove, thereby combining the thermal fuse with the first and second ends, thereby simplifying the assembly process and preventing the defective fuse resistor and its manufacture method.

It is embedded in a circuit of a large-scale electronic product such as an LCD TV or a PDP TV. In order to prevent a machine fault caused by a surge current, an internal temperature rise, a continuous overcurrent, etc., when the power is turned on, it is set at the power input end of the circuit. Protect the power circuit by protecting the components such as fuse resistors.

Such a fuse resistor first has a resistor body and a temperature fuse, and the resistor body and the temperature fuse are connected in series to each other through a wire.

Further, in the fuse resistor, in order to prevent other electronic components from being affected by the debris generated when the fuse element layer is blown, the resistor body and the temperature fuse are packaged with the case, and the inside of the case is filled with the filler.

Among them, in consideration of heat resistance, conductivity, thermosetting property and the like, the filler uses a slurry filler containing cerium oxide (SiO ₂ ), which is generally used as a ceramic material casing of a general resistor housing.

In addition, the end of the wire extends to be taken out to the outside of the casing. In a conventional fuse resistor, the end of the wire is soldered to the printed circuit board, thereby setting the resistor body and the thermal fuse in an upright state. On a printed circuit board.

Therefore, the fuse resistor as described above restricts it to a predetermined current by the resistor body when the surge current flows, and short-circuits the circuit when the overcurrent flows, so that heat generated by heat generation of the resistor body is transmitted to the temperature through the filler. The fuse fuses a fuse element layer composed of solid lead or polymer pellets provided inside the thermal fuse to protect the circuit of the home appliance.

FIG. 5a and FIG. 5b are schematic diagrams showing a conventional fuse resistor. For reference, Korean Patent Application No. 10-1060013 discloses a fuse resistor comprising: a resistor body 10; a temperature fuse 20, The circuit is short-circuited by the heat generated by the resistor body 10; the wires 31, 33 are connected in series with the resistor body 10 and the thermal fuse 20; the housing 40 is open on one side, and a lead-out groove for drawing the wire is formed on one wall surface 41, thereby accommodating the resistor body 10 and the thermal fuse 20 inside with the ends of the wires 32, 34 drawn to the outside; the filler 50, which is filled inside the casing 40, contains ruthenium dioxide, the resistor body 10, and the temperature The fuse 20 is embedded inside.

However, the Korean Patent Application discloses a structure in which a circuit board and a temperature fuse are adjacent to each other. Therefore, the temperature fuse may be blown by heat generated during soldering, and the lead 31 of the resistor body and the lead of the temperature fuse 33 The process of joining is cumbersome, difficult to automate, and there is a risk of wire breakage of the wires 31, 33 that are engaged during assembly.

The present invention has been made to solve the above-mentioned technical problems, and an object of the present invention is to provide a temperature fuse and a method of manufacturing the same, which are formed by injection molding, and The housing combined with the thermal fuse is embedded in the insertion groove, thereby bonding the thermal fuse to the first and second ends, thereby simplifying the assembly process and preventing poor connection.

In order to achieve the above object, a fuse resistor according to the present invention includes: a resistor body; a first lead wire and a second lead wire connected to the resistor body; a molding portion having an insertion groove formed at one side thereof; and a temperature fuse a plate shape connected to the resistor body; a housing embedded in the insertion slot, and a temperature fuse receiving groove for receiving the temperature fuse, the first wire being composed of a first wire portion and a second wire portion, One end of the first electric wire portion is connected to the electric resistance body, and the other end forms a first end portion protruding from an upper side of the insertion groove, and one end of the second electric wire portion is formed to protrude from a lower side of the insertion groove and the first end a second end portion separated by an end, the other end is drawn from a lower side of the molding portion, one end of the second wire is connected to the other side of the resistor body, and the other end is led out from a lower side of the molding portion, the temperature One side of the fuse housing groove is opened to insert the first end portion and the second end portion, and the other side is formed with a mounting portion for mounting the temperature fuse, and the temperature fuse mounted on the mounting portion is connected A first end portion and second end portion.

Further, wherein the temperature fuse of the fuse resistor according to the present invention is centrifugally coupled to the side faces of the first end portion and the second end portion.

Further, the mounting portion of the fuse resistor according to the present invention is formed in a curved shape.

Further, in the thermal fuse housing groove of the fuse resistor according to the present invention, a fixing protrusion of a thermal fuse is formed to fix the thermal fuse attached to the mounting portion.

Further, in the fuse resistor of the present invention, a fuse groove is formed on one side or both sides of the temperature fuse housing groove so that the molten temperature fuse can be blown.

Further, the recessed depth of the fuse groove of the fuse resistor according to the present invention is greater than or equal to the recessed depth of the temperature fuse housing groove.

Further, in the housing of the fuse resistor according to the present invention, a coupling protrusion is formed in the housing, and the insertion groove is formed with a coupling groove into which the coupling protrusion is hooked.

Further, a method of manufacturing a fuse resistor according to the present invention includes the steps of: mounting a resistor body incorporating a first wire and a second wire in a mold, and injecting a resin into the mold to form a molding portion, One side of the molded portion forms an uninserted insertion groove to expose a portion of the first wire; the first wire exposed from the insertion groove is cut to be separated into a first wire portion and a second wire portion, so that The first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion protrude in the vertical direction of the insertion groove; the housing on which the one side is opened and the other side is formed with the thermal fuse housing groove A thermal fuse is mounted in the thermal fuse receiving slot; the housing is inserted into the insertion slot, and the thermal fuse is coupled to the first end and the second end.

Further, a method of manufacturing a fuse resistor according to the present invention includes the steps of: preparing a resistor body to which a first wire and a second wire are bonded, and cutting a portion of the first wire to be separated into a first wire portion and a second electric wire portion; separating the first electric wire portion and the second electric wire portion from each other, and mounting the electric resistance body into a mold; injecting resin into the mold to form a molding portion, and at this time, a molding portion Forming an insertion groove on the side such that the first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion are not injected and exposed to the outside; a housing in which the thermal fuse receiving groove is formed is prepared, A thermal fuse is mounted in the thermal fuse receiving slot; the housing is inserted into the insertion slot, and the thermal fuse is coupled to the first end and the second end.

Further, in the method of manufacturing a fuse resistor according to the present invention, the mounting portion is formed in a curved shape and transmits the first end and the second end inserted into the thermal fuse housing groove. The thermal fuse is pressed against the curved mounting portion, and the thermal fuse housed in the mounting portion is fixed by the fixing projection located in the thermal fuse housing groove.

Further, in the method of manufacturing a fuse resistor according to the present invention, the temperature fuse is pressed by the casing to be fixed to the first end portion and the second end portion.

Further, in the method of manufacturing a fuse resistor according to the invention, the temperature fuse is fixed to the first end portion and the second end portion by welding.

According to the fuse resistor of the present invention as described above and the method of manufacturing the same, the molded portion formed by injection molding is formed, and the housing combined with the thermal fuse is embedded in the insertion groove, thereby making the thermal fuse and the first and second ends The combination is combined, so that it has the effect of simplifying the assembly process and preventing poor connection.

10‧‧‧Resistive body

20‧‧‧temperature fuse

31‧‧‧ wire

32‧‧‧Wire

33‧‧‧Wire

34‧‧‧Wire

40‧‧‧shell

41‧‧‧ lead slot

50‧‧‧Filling

100‧‧‧Fuse resistor

110‧‧‧Resistor body

111‧‧‧First wire

112‧‧‧First Wire Department

113‧‧‧ first end

114‧‧‧Second wire department

115‧‧‧second end

116‧‧‧Departure

117‧‧‧second wire

120‧‧‧Forming Department

121‧‧‧ Insert slot

122‧‧‧ Combination slot

133‧‧‧ solder

137‧‧‧temperature fuse

140‧‧‧shell

141‧‧‧Contacts

143‧‧‧Temperature fuse storage slot

143a‧‧‧Installation Department

143b‧‧‧Fixed projections

145‧‧‧Combined protrusions

147‧‧‧Fuse slot

Fig. 1a is a perspective view showing an embodiment of a fuse resistor according to the present invention.

Fig. 1b is an exploded perspective view of Fig. 1a.

Fig. 1c is an exploded perspective view of Fig. 1a.

Fig. 1d is a cross-sectional view taken along line A-A of Fig. 1a.

[Fig. 2a] is a perspective view showing a casing and a temperature fuse according to the present invention.

Fig. 2b is a cross-sectional view taken along line B-B of Fig. 2a.

Fig. 3a is a cross-sectional view showing a state in which the resistor body of the present invention is molded.

Fig. 3b is a cross-sectional view showing a state after the first wire of the present invention is cut.

Fig. 3c is a cross-sectional view showing a state in which the first and second end portions of the present invention are in contact with the thermal fuse.

Fig. 3d is a cross-sectional view showing a state in which the first and second end portions of the present invention are in contact with the thermal fuse.

Fig. 3e is a cross-sectional view showing a state in which the casing and the thermal fuse of the present invention are fitted into the housing groove.

[Fig. 4a] is a schematic view showing the resistor body in a state where the first wire of the present invention is cut.

Fig. 4b is a schematic view showing a state in which a molded portion is formed on the resistor body of the present invention.

[Fig. 5a] is a schematic view showing a conventional fuse resistor.

[Fig. 5b] is a schematic view showing a conventional fuse resistor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the description of the present invention, it is to be understood that the detailed description of the related features or structures may be unnecessarily obscured. In addition, the term to be described later is a term defined in consideration of its function in the present invention, and may vary depending on the intention of the user, the intention of the user, or the case. Therefore, the definition is to be determined in accordance with the entire contents of this specification.

Fig. 1a is a perspective view showing an embodiment of a fuse resistor according to the present invention, and Figs. 1b and 1c are exploded perspective views of Fig. 1a, and Fig. 1d is a cross-sectional view taken along line A-A of Fig. 1a. 2a is a perspective view showing a casing and a temperature fuse according to the present invention, and FIG. 2b is a cross-sectional view taken along line B-B of FIG. 2a.

Referring to FIGS. 1a through 2b, the fuse resistor 100 of the present invention can be used in an electric circuit of an electronic product, and generally includes a resistor body 110, a molding portion 120, a temperature fuse 137, and a housing 140.

The first wire 111 and the second wire 117 are disposed at both ends of the resistor body 110.

The first wire 111 is connected to the first wire portion directly connected to the resistor body 110 112 is constituted by a second electric wire portion 114 which is spaced apart from the first electric wire portion 112 and which is taken out from the lower side of the molding portion 120.

The molded portion 120 functions as a case of the resistor body 110, and seals the resistor body 110 and a part of the first and second wires 111 and 117, and is exemplified by a synthetic resin material. However, the present invention is not limited thereto. Further, the first and second wires 111 and 117 are bent in the molded portion 120 and taken out from the lower side of the molded portion 120.

One side of the molding portion 120 is formed with an insertion groove 121 into which the housing 140 is coupled.

The first end portion 113 of the first electric wire portion 112 protrudes from the upper side of the insertion groove 121, and the second end portion 115 of the second electric wire portion 114 protrudes from the lower side.

A partition portion 116 is formed between the first end portion 113 and the second end portion 115, and the temperature fuse 137 is inserted and fixed in the partition portion 116.

The temperature fuse 137 is formed in a plate shape and is fixed between the first end portion 113 and the second end portion 115, and is connected in series with the resistor body 110, and is blown by heat generated by the resistor body 110 to short-circuit the circuit. Protects the components that are placed in the circuit.

In this case, an example in which the temperature fuse 137 and the first and second end portions 113 and 115 are joined by reflow soldering or pressed by the case 140 to contact the first and second end portions 113 and 115 may be mentioned.

The housing 140 is inserted and fixed in the insertion groove 121, and an outer surface of the housing 140 is formed with a coupling protrusion 145, and the insertion groove 121 is formed with a coupling groove 122 so that the coupling protrusion 145 is fitted.

Moreover, the housing 140 is formed of an insulating material such as a synthetic resin. For example, it is fitted into the insertion groove 121, and a temperature fuse housing groove 143 for accommodating the temperature fuse 137 is formed.

One side of the temperature fuse housing groove 143 is opened to be inserted into the first and second end portions 113, 115, and the other side is formed with a mounting portion 143a for mounting the temperature fuse 137.

The mounting portion 143a is formed in a curved shape, and a fixing protrusion 143b of a thermal fuse is formed on the upper side of the mounting portion 143a.

Further, as shown in FIG. 3c, the temperature fuse 137 is pressed by the first and second end portions 113, 115 in a state of being placed on the fixing protrusion 143b formed on the mounting portion 143a, and is housed in the insertion manner. Mounting portion 143a. Therefore, the flat-shaped heat fuse 137 is bent along the curved surface of the attachment portion 143a to be semi-cylindrical and is fixed by the fixing projection 143b by being pressed by the first and second end portions 113 and 115. Although the temperature fuse is not shown, it may be manufactured in a plate shape of a semicircular cross-sectional structure instead of a flat plate as shown in FIG. 3c, and may be housed in the mounting portion.

A contact portion 141 is formed on both sides of the temperature fuse receiving groove 143 in contact with the inner surface of the insertion groove 121. One or both sides of the contact portion 141 are formed with a fuse groove, which provides a molten temperature fuse capable of being blown. Space.

The fuse groove 147 provides a minimum space in which the temperature fuse 137 that is melted by the heat generated by the resistor body 110 can be broken (short-circuited), and can be formed on one side or both sides of the temperature fuse housing groove. Further, since the fuse groove 147 has a recessed depth equal to or deeper than the temperature fuse housing groove 143, the molten temperature fuse 137 moves toward the fuse groove 147 side to be easily melted.

The contact portion 141 is in contact with the inner surface of the insertion groove 121, so that heat generation of the resistor body 110 can be better transmitted to the temperature fuse 137, coated with an adhesive material or the like to close it. Grounded into the insertion slot 121.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method of manufacturing a fuse resistor according to the present invention will be described in detail with reference to the drawings. Detailed descriptions are omitted for the same or similar components as those described above.

3a is a cross-sectional view showing a state after molding of the resistor body of the present invention, FIG. 3b is a cross-sectional view showing a state after cutting of the first wire of the present invention, and FIG. 3c and FIG. 3d are diagrams showing the first aspect of the present invention. A cross-sectional view showing a state in which the second end portion is in contact with the thermal fuse, and FIG. 3e is a cross-sectional view showing a state in which the casing and the thermal fuse of the present invention are fitted into the housing groove.

Referring to Fig. 3a, in the method of manufacturing a fuse resistor according to the present invention, first, the resistor body 110 incorporating the first and second wires 111, 117 is mounted in a mold, and is formed by injection molding of a resin into the mold. A molding portion 120 having one side of the molding portion forming an insertion groove 121 that is not injection molded to expose a portion of the first wire 111.

Next, referring to FIG. 3b, the first wire 111 is cut to be separated into the first wire portion 112 and the second wire portion 114 such that the first end portion 113 of the first wire portion 112 and the second end of the second wire portion 114 are The portion 115 protrudes in the vertical direction of the insertion groove 121, and a partition portion 116 is formed between the first end portion 113 and the second end portion 115.

Next, referring to FIG. 3c to FIG. 3e, a case 140 in which one side is opened and the other side is formed with a temperature fuse housing groove 143 is prepared, and a temperature fuse 137 is attached to the temperature fuse housing groove 143. Then, the housing 140 is inserted into the insertion slot 121, and the thermal fuse 137 is brought into contact with the first and second end portions 113, 115, and the thermal fuse 137 and the first and second electrodes can be coupled by reflow soldering. Ends 113, 115. Alternatively, the temperature fuse 137 may be pressed by the casing 140 to contact the first and second end portions 113, 115.

Specifically, in a state where the temperature fuse 137 is placed on the fixing protrusion 143b formed on the thermal fuse housing groove 143, the first and second end portions 113, 115 are pressed against the temperature fuse 137, the temperature fuse The 137 is mounted on the mounting portion 143a and fixed by the fixing protrusion 143b.

The thermal fuse 137 is coated with a solder 133 which is fixed to the first and second end portions 113 and 115 and the thermal fuse 137 by reflow soldering which will be described later. However, when the temperature fuse 137 is pressed by the casing 140, it can be fixed without using the solder 133.

On the other hand, the coupling protrusion 145 of the housing 140 can be fitted into the coupling groove 122 formed in the insertion groove 121, and fixed by the adhesive material coated on the outer surface of the housing 140.

4a is a schematic view showing the resistor body in a state where the first wire of the present invention is cut, and FIG. 4b is a schematic view showing a state in which the molded portion is formed on the resistor body of the present invention.

Referring to FIG. 4a and FIG. 4b, in the manufacturing method of the fuse resistor according to the embodiment, first, the resistor body 110 to which the first and second wires 111 and 117 are bonded is prepared, and a part of the first wire 111 is cut to be separated into A wire portion 112 and a second wire portion 114.

Then, the first electric wire portion 112 and the second electric wire portion 114 are spaced apart from each other, and the electric resistance body 110 is mounted in a mold, and resin is injected into the mold to form a molding portion 120.

At this time, one side of the molding portion 120 is formed with the insertion groove 121 such that the first and second end portions 113, 115 of the cut portions of the first and second electric wire portions 112, 114 are not injection molded but are externally Exposed.

Then, as described with reference to FIGS. 3c to 3e, a casing 140 having one side opened and the other side having a temperature fuse housing groove is prepared, and the temperature is installed in the temperature fuse housing groove 143. Fuse 137. Then, the housing 140 is inserted into the insertion slot 121, and the thermal fuse 137 is brought into contact with the first and second end portions 113, 115, and the thermal fuse 137 and the first and second ends are coupled by reflow soldering. Parts 113, 115, thereby completing the manufacture of the fuse resistor. Further, as described above, when the temperature fuse 137 is pressed by the casing 140 and fixed to the first and second end portions 113, 115, the welding process can be omitted.

That is, the present embodiment is different from the previously described embodiment in that a molding portion is formed after the first wire is cut.

The conclusion is that the conventional fuse resistor is manufactured by bonding a wire on the resistor body and a wire on the thermal fuse, and embedding the combination of the resistor body and the thermal fuse into the casing, and filling the casing with a filler. However, in the present invention, instead of the filler, the molded portion formed by injection molding is joined, and the temperature fuses bonded to the casing are joined to the first and second ends by welding or pressurization, thereby simplifying the assembly process. The advantages.

On the other hand, the specific embodiments of the present invention have been described in the detailed description and the drawings, but the present invention is not limited to the disclosed embodiments, and those having ordinary knowledge in the technical field to which the present invention pertains Various substitutions, modifications, and changes can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention should not be limited to the illustrated embodiment, but should include the scope of the claims and the scope of equivalents thereof.

100‧‧‧Fuse resistor

111‧‧‧First wire

117‧‧‧second wire

120‧‧‧Forming Department

140‧‧‧shell

Claims (12)

A fuse resistor, comprising: a resistor body; a first wire and a second wire connected to the resistor body; a molding portion having an insertion groove formed on one side thereof; and a temperature fuse having a plate shape Connected to the resistor body; a housing embedded in the insertion slot and formed with a thermal fuse receiving slot for receiving the thermal fuse, wherein the first wire is composed of a first wire portion and a second wire portion One end of the first electric wire portion is connected to the electric resistance body, and the other end is formed with a first end portion protruding from an upper side of the insertion groove, and one end of the second electric wire portion is formed to protrude from a lower side of the insertion groove a second end portion spaced apart from the first end portion, and the other end is drawn from a lower side of the molding portion, wherein one end of the second wire is connected to the other side of the resistor body, and the other end is connected to the molding portion The lower side is taken out, wherein one side of the thermal fuse receiving groove is opened to be inserted into the first end portion and the second end portion, and the other side is formed with a mounting portion for mounting the thermal fuse, wherein the mounting portion is The temperature of the fuse mounting portion connected to the first end and the second end portion. The fuse resistor of claim 1, wherein the temperature fuse is centrifugally coupled to a side of the first end and the second end. The fuse resistor according to claim 1, wherein the mounting portion is formed in a curved shape. The fuse resistor according to claim 1, wherein the thermal fuse receiving groove is formed with a fixing protrusion of a thermal fuse to fix the thermal fuse mounted on the mounting portion. The fuse resistor according to claim 1, wherein a fuse groove is formed on one side or both sides of the temperature fuse receiving groove to enable the molten temperature fuse to be blown. The fuse resistor of claim 5, wherein the recessed groove has a recessed depth greater than or equal to a recessed depth of the thermal fuse receiving groove. The fuse resistor of claim 1, wherein the housing is formed with a coupling protrusion, and the insertion groove is formed with a coupling groove, and the coupling protrusion is buckled into the coupling groove. A manufacturing method of a fuse resistor, comprising the steps of: mounting a resistor body incorporating a first wire and a second wire in a mold, injecting resin into the mold to form a molding portion, and one of the molding portions Forming an uninserted insertion groove to expose a portion of the first wire; and cutting the first wire exposed from the insertion groove to be separated into a first wire portion and a second wire portion a first end portion and a second end portion of the cut portion of the electric wire portion and the second electric wire portion protrude toward the vertical direction of the insertion groove; a housing having a side open and a thermal fuse housing groove formed on the other side is prepared A thermal fuse is mounted in the thermal fuse receiving slot; the housing is inserted into the insertion slot, and the thermal fuse is coupled to the first end and the second end. A manufacturing method of a fuse resistor, comprising the steps of: preparing a resistor body combined with a first wire and a second wire, cutting a portion of the first wire to be separated into a first wire portion and a second portion Wire department Separating the first electric wire portion and the second electric wire portion from each other, and mounting the electric resistance body into a mold; injecting resin into the mold to form a molding portion, at which time an insertion is formed on one side of the molding portion a groove such that the first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion are not injected and exposed to the outside; a housing in which the thermal fuse housing groove is formed is prepared A thermal fuse is mounted in the thermal fuse receiving slot; the housing is inserted into the insertion slot, and the thermal fuse is coupled to the first end and the second end. The method of manufacturing the fuse resistor according to claim 8 or 9, wherein one side of the temperature fuse receiving groove is opened to insert the first end portion and the second end portion, and the other side is formed with the temperature for mounting a mounting portion of the fuse, wherein the mounting portion is formed in a curved shape, and the first end portion and the second end portion inserted into the thermal fuse housing groove are pressed to close the temperature fuse to the curved surface. In the mounting portion, the thermal fuse housed in the mounting portion is fixed by a fixing protrusion located in the temperature fuse housing groove. The method of manufacturing a fuse resistor according to claim 8 or 9, wherein the fuse resistor is pressed by the housing to be fixed to the first end portion and the second end portion. The method of manufacturing a fuse resistor according to claim 8 or 9, wherein the temperature fuse is fixed to the first end portion and the second end portion by welding.