TW201624503A - Fuse resistor and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fuse resistor and a manufacturing method thereof and, more particularly, to a fuse resistor and a manufacturing method thereof, capable of simplifying an assembly process by forming a molding part with an insertion mold and inserting and bonding a temperature fuse into a first end and a second end located in an insertion groove which is formed on one side of the molding part. Wherein, the fuse resistor is installed on an electric circuit of an electronic product to prevent the breakdown of a device due to a continuous overcurrent, an internal temperature rise, and an inrush current.

Description

Fuse resistor and method of manufacturing same

The present invention relates to a fuse resistor and a method of manufacturing the same. Specifically, regarding 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, or the like, the molding portion formed by injection molding is inserted at the side of the molding portion. A thermal fuse is inserted between the first and second ends of the slot and combined to simplify the assembly process of the fuse resistor and the method of manufacturing the same.

Generally, in the circuit of large-scale electronic products such as LCD TVs and PDP TVs, in order to prevent machine faults caused by surge currents, internal temperature rise, continuous overcurrent, etc., when the power is turned on, the power input terminal of the circuit is set as The fuse resistor protects the power circuit.

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 formed of solid lead or polymer pellets inside the thermal fuse to protect the circuit of the home appliance.

FIG. 8a and FIG. 8b 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 inserted into its interior.

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 combining is cumbersome, difficult to automate, and there is a risk of wire breakage in the combined wires 31, 33 during assembly.

The present invention has been made to solve the above 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 are located in a molding portion. A thermal fuse is inserted between the first and second ends of the insertion groove on one side and combined, thereby simplifying the assembly process and maximally preventing poor connection.

In order to achieve the above object, a fuse resistor according to the present invention includes: a resistor body; a first wire and a second wire connected to the resistor body; and a molding portion having an insertion groove formed at one side thereof; a temperature fuse, Connected to the resistor body, the first wire is composed of a first wire portion and a second wire portion, one end of the first wire portion is connected to the resistor body, and the other end is formed to protrude from an upper side of the insertion groove An end portion of the second electric wire portion is formed with a second end portion protruding from a lower side of the insertion groove and spaced apart from the first end portion, and the other end is led toward a lower side of the molding portion, the temperature fuse is inserted The first end portion and the second end portion are connected to the resistor body.

Further, among them, a housing that fits into the insertion groove of the fuse resistor according to the present invention is also included.

Further, the case of the fuse resistor according to the present invention includes a temperature fuse housing groove for accommodating the temperature fuse, and a contact portion disposed on both sides of the temperature fuse housing groove and in contact with the insertion groove.

Further, in the thermal fuse housing groove of the fuse resistor according to the present invention, a thermal fuse fixing portion for embedding the thermal fuse is formed.

Further, in the housing of the fuse resistor according to the present invention, a coupling protrusion is formed, 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, the molding portion One side is formed with an uninserted insertion groove such that a portion of the first wire is exposed; the first wire exposed from the insertion groove is cut to be separated into a first wire portion And the second wire portion, the first end portion and the second end portion of the cut portion of the first wire portion and the second wire portion are protruded in the vertical direction of the insertion groove; the temperature fuse is embedded and fixed at the first end Between the portion and the second end.

Further, in the method of manufacturing a fuse resistor according to the invention, the temperature fuse is fitted between the first end portion and the second end portion in a state of being coupled to the housing, the housing being fitted in the insertion groove, A heat fuse fixing portion is formed on the inner surface thereof, and the temperature fuse fixing portion is disposed on the same vertical line as the first end portion and the second end portion for embedding the temperature fuse.

Further, a method of manufacturing a fuse resistor according to the present invention, further comprising the steps of: after welding or fixing a temperature fuse between the first end and the second end, fixing The housing is fitted and fixed in the insertion groove.

According to the fuse resistor of the present invention and the method of manufacturing the same, the heat-insulated fuse is inserted and joined between the first and second end portions of the insertion groove on the side of the molding portion through the molding portion formed by injection molding. Therefore, it has the effect of simplifying the assembly process and maximally preventing the connection failure.

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‧‧‧Thermal fuse fixing part

145‧‧‧Combined protrusions

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

Fig. 2a is an exploded perspective view of Fig. 1.

Fig. 2b is an exploded perspective view of Fig. 1.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 1.

[Fig. 4] shows a fuse resistor of a housing having a structure different from that of Figs. 1, 2a, and 2b. Stereoscopic view of the device.

Fig. 5 is a cross-sectional view taken along line B-B of Fig. 4.

Fig. 6a is a schematic view showing a state after molding of the resistor body of the present invention, and Fig. 6b is a schematic view showing a state after the first wire is cut in the present invention.

Fig. 6c is a schematic view showing a state in which the temperature fuse of the present invention is inserted into the insertion groove.

Fig. 6d is a schematic view showing a state in which a casing is coupled to the insertion groove of the present invention.

Fig. 7a is a schematic view showing the resistor body in a state in which the first wire of the present invention is cut.

Fig. 7b is a schematic view showing a state in which a molded portion is formed on the resistor body of the present invention.

Fig. 7c is a schematic view showing a state in which the temperature fuse of the present invention is inserted between the first and second end portions and welded.

[Fig. 8a] is a schematic view showing a conventional fuse resistor.

[Fig. 8b] 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.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of a fuse resistor according to the present invention, Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is a cross-sectional view taken along line A-A of Fig. 1.

Referring to FIGS. 1 through 3, the fuse resistor 100 of the present invention is used in an electronic product. The circuit of the product generally includes a resistor body 110, a molding portion 120, a thermal fuse portion 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 composed of a first wire portion 112 directly connected to the resistor body 110 and a second wire portion 114 spaced apart from the first wire portion 112 and drawn 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 a thermal fuse is inserted and fixed in the partition portion 116.

The temperature fuse 137 is connected in series with the resistor body 110, and is blown through the heat generated by the resistor body 110 to short-circuit the circuit, thereby protecting the components disposed in the circuit, and is fixed to the first end portion 113 and the second end. The portions 115 are connected in series with the resistor body 110.

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 welding may be mentioned.

The housing 140 is inserted into and fixed in the insertion slot 121. The outer surface of the housing 140 is formed with a coupling protrusion 145. The insertion slot 121 is formed with a coupling groove 122 for the coupling protrusion. 145 chimera.

Further, an example in which the casing 140 is formed of an insulating material such as synthetic resin may be used, and the temperature fuse housing groove 143 that houses the temperature fuse 137 and the two sides of the temperature fuse housing groove 143 may be disposed with the insertion groove 121. The contact portion 141 in contact with the inner surface is formed.

The temperature fuse housing groove 143 provides a space in which the thermal fuse 137 that is melted by the heat generation of the resistor body 110 can be disconnected (short-circuited).

The contact portion 141 is in contact with the inner surface of the insertion groove 121 so that heat generation of the resistance body 110 can be well transmitted to the temperature fuse 137, and an adhesive material or the like is applied to be tightly coupled into the insertion groove 121.

4 is a perspective view showing a fuse resistor having a casing having a structure different from that of FIGS. 1, 2a and 2b, and FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4.

Referring to FIGS. 4 and 5, the housing 140 is formed with a thermal fuse fixing portion 143a extending from the thermal fuse housing groove 143 for coupling the thermal fuse 137.

The temperature fuse fixing portion 143a is disposed on the same vertical line as the first and second end portions 113 and 115, and has a corresponding shape in which a thermal fuse having a circular cross section can be inserted. Specifically, it may have a semicircular cross section that is open on one side. The open area is smaller than the diameter of the fuse of the temperature, thereby achieving embedding and fixing.

As described above, the temperature fuse 137 is fitted between the first and second end portions 113, 115 in a state of being coupled to the temperature fuse fixing portion 143a of the housing 140, so that the process can be simplified, for details of this. The content will be described later.

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. For the same or similar content as the structure described above, the details are omitted. Detailed description.

6a is a schematic view showing a state after molding of the resistor body of the present invention, FIG. 6b is a schematic view showing a state after cutting of the first wire of the present invention, and FIG. 6c is a view showing that the temperature fuse of the present invention is embedded in the insertion groove. FIG. 6d is a schematic view showing a state in which a casing is coupled to the insertion groove of the present invention.

Referring to Fig. 6a, in the method of manufacturing a fuse resistor according to the present invention, the resistor body 110 incorporating the first and second wires 111 and 117 is mounted on a mold, and a molding method is formed by injecting a resin into the mold. The portion 120 is formed with an insertion groove 121 that is not injection molded on one side of the molding portion 120 such that a portion of the first wire 111 is exposed.

Referring to 6b, 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 portion 115 of the second wire portion 114 face the The insertion groove 121 protrudes in the vertical direction, and a partition portion 116 is formed between the first end portion 113 and the second end portion 115.

Referring to FIG. 6c, in a state in which the cylindrical heat fuse 137 is fitted into the partition portion 116 between the first and second end portions 113, 115, the temperature fuse 137 and the first portion can be combined by spot welding or welding, respectively. First, second end portions 113, 115.

Referring to Fig. 6d, the housing 140 is fitted and fixed in the insertion groove 121, thereby completing the manufacture of the fuse resistor. At this time, the coupling protrusion 145 formed on the housing 140 may be embedded and fixed in the coupling groove 122 formed on the insertion groove 121, although not shown, may be coated on the outer surface of the housing 140. Adhesive material for fixing.

Fig. 7a is a schematic view showing the resistor body in a state where the first wire of the present invention is cut, and Fig. 7b is a view showing a state in which the molded portion is formed on the resistor body of the present invention, Fig. 7c It is a schematic view showing a state in which the temperature fuse of the present invention is fitted between the first and second end portions and welded.

Referring to FIG. 7a and FIG. 7b, 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 on a mold, and resin is injected into the mold to form the molding portion 120.

At this time, one side of the molding portion 120 forms 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 exposed to the outside. .

Referring to Fig. 7c, the temperature fuse 137 is inserted into a thermal fuse fixing portion 143a located on one side of the housing 140 and disposed on the same line as the first and second end portions 113, 115. Then, the housing 140 is embedded in the insertion slot 121 such that the thermal fuse 137 is disposed between the first and second ends 113, 115, and then combined with the thermal fuse 137 and the first and second through reflow soldering. Ends 113, 115.

Here, before and after the thermal fuse 137 is coupled to the thermal fuse fixing portion 143a, the paste-like solder 133 is applied to both ends of the thermal fuse or the first and second end portions 113, 115, and then reflow soldering is performed.

In the above-described embodiment, for each fuse resistor, the temperature fuse and the first and second ends are separately soldered to achieve bonding, thus requiring a large amount of time and cost, but in this embodiment, the transmission is The plurality of fuse resistors combined with the thermal fuse fixing portion of the housing are reflow soldered at one time to achieve bonding, so that mass production is easy, saving time and cost.

The conclusion is that the conventional fuse resistor is manufactured by combining 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 the filler. However, in the present invention, instead of the filler, the molded portion formed by injection molding is inserted and a thermal fuse is interposed between the first and second end portions, and the bonding is performed, so that the assembly process can be simplified.

On the other hand, the specific embodiments have been described in the specification and drawings of the present invention, 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, Many alternatives, modifications, and changes can be made without departing from the spirit 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 thereof.

100‧‧‧Fuse resistor

111‧‧‧First wire

117‧‧‧second wire

120‧‧‧Forming Department

140‧‧‧shell

Claims (10)

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; a temperature fuse, and the resistor a body connection, wherein the first wire is composed of a first wire portion and a second wire portion, one end of the first wire portion is connected to the resistor body, and the other end is formed to protrude from an upper side of the insertion groove One end portion, one end of the second electric wire portion forms a second end portion protruding from a lower side of the insertion groove and spaced apart from the first end portion, and the other end is taken out 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 led out from the lower side of the molding portion, wherein the temperature fuse is inserted between the first end portion and the second end portion to The resistor body is connected. The fuse resistor of claim 1, wherein the thermal fuse forms a coaxial coupling with the first end and the second end. The fuse resistor of claim 1, further comprising a housing that is fitted into the insertion slot. The fuse resistor according to claim 3, wherein the casing is constituted by a temperature fuse housing groove accommodating the temperature fuse, and a contact portion disposed on both sides of the temperature fuse housing groove and in contact with the insertion groove. The fuse resistor according to claim 4, wherein the thermal fuse housing is formed with a thermal fuse fixing portion for embedding the thermal fuse. The fuse resistor of claim 3, 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 combined with a first wire and a second wire into a mold, injecting resin into the mold to form a molding portion, in the molding portion Forming an uninserted insertion groove on one side to expose a portion of the first wire; 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 first electric wire portion and the second electric wire portion protrude toward an upper and lower direction of the insertion groove; a thermal fuse is embedded and fixed at the first end portion and the second portion Between the ends. 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 a wire portion; separating the first wire portion and the second wire portion from each other, and mounting the resistor body into a mold; injecting resin into the mold to form a molding portion, at one side of the molding portion Forming an insertion 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 molded and exposed to the outside; a thermal fuse is embedded and fixed at the first Between the end and the second end. The method of manufacturing a fuse resistor according to claim 7 or 8, wherein the temperature fuse is embedded between the first end and the second end in a state of being combined with a casing, The housing is fitted in the insertion slot, and a thermal fuse fixing portion is formed on the inner surface of the housing. The thermal fuse fixing portion is disposed on the same vertical line as the first end portion and the second end portion. Used to embed this temperature fuse. The method of manufacturing a fuse resistor according to claim 7 or 8, further comprising the step of: fitting the temperature fuse between the first end portion and the second end portion, and then fitting a casing Fixed in the insertion slot.