KR101725759B1 - Resistance heating type thermal fuse assembly - Google Patents

Abstract

More particularly, the present invention relates to a resistance fuse type thermal fuse assembly, and more particularly, to a resistance fuse type thermal fuse assembly which is disposed on a circuit and which, when applied with an overcurrent, To a temperature resistant fuse assembly of a resistance heating type.

Description

[0001] Resistance heating type thermal fuse assembly [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resistance heating type thermal fuse assembly, and more particularly, to a resistance fuse type thermal fuse assembly which is disposed on a circuit, To a resistance heating type thermal fuse assembly.

Generally, electric circuits of electronic devices are protected by protecting the power circuit by installing a thermal fuse in the power input terminal of the circuit to prevent the malfunction of the electronic device caused by the inrush current, the internal temperature rise, and the continuous overcurrent which occur when the power is turned on. .

In recent years, a thermal fuse resistor (thermal fuse resistor) which connects a thermal fuse and a resistor in a series structure to disconnect the thermal fuse due to the heat generated by the resistor when the overcurrent is applied to the electric circuit, Has been developed to ensure higher safety of electronic devices.

However, it has been pointed out that the conventional thermal fuse resistor has a problem that the thermal fuse is disconnected due to factors other than the heat generation of the resistor, which is fused as the internal temperature of the electronic device rises.

In order to solve this problem, in Korean Patent Laid-Open Publication No. 10-2007-0035752, a thermal fuse resistor in which a resistor and a thermal fuse are connected in series is housed in an alumina case, and then a thermal fuse resistor filled with silica and magnesium oxide And a thermal fuse resistor having a resistor and a thermal fuse connected in series and being disposed in the case so as to be spaced apart from each other has been proposed in Korean Patent Publication No. 10-1038237.

If the thermal fuse constituting the thermal fuse assembly is arranged in a regular shape in the case, the thermal fuse assembly is stably maintained, and the thermal fuse is disconnected due to other factors, Can be solved.

However, since the thermal fuse and the resistor are separately manufactured and then assembled through soldering or the like, and the thermal fuse and the resistor connected in series through soldering are accommodated in the separately formed case to form a single structure, There arises a problem that the production cost is excessively increased due to the manufacturing process and parts.

Particularly, it is structurally difficult to install the thermal fuse assembly in a small electronic device in which the thermal fuse, the resistor, and the housing for housing the thermosyce fuse and the case are accommodated.

In order to solve such a problem, the present inventors have proposed a ceramic ceramic tube having a hollow ceramic support tube made of a ceramic material through Korean Patent Registration No. 1488168; A thermal fuse accommodated in the hollow portion of the ceramic support tube; And a resistance heating line wound around the outer diameter of the ceramic support tube accommodating the thermal fuse and connected in series with the end of the thermal fuse. The thermal fuse is housed in the hollow portion of the ceramic support tube, Wherein the thermal fuse accommodated in the hollow portion of the ceramic support tube is disconnected to disconnect the electric circuit when an overcurrent is applied along the electric circuit to generate a resistance heating line and the ceramic support tube is heated. .

In addition, such a thermo-fuse resistor can be manufactured in a very small size, and it can be stably accommodated and installed in a variety of small electronic devices such as a smart phone or a small charger in which space for installation is limited.

However, the thermal fuse resistor has the following problems.

First, the thermal fuse resistor has a pair of lead terminals arranged on one side, and a short circuit of the lead terminal can be generated when the ends of mutually spaced circuits are deformed by external force.

Secondly, since the thermal fuse resistor has a thermal fuse formed integrally in the resistance heating element, it is difficult to adopt a general-purpose thermal fuse cartridge. Therefore, a resistance heating element and a thermal fuse must be manufactured according to various standards, Which leads to excessive costs in terms of production and inventory management.

Third, since the thermal fuse resistor depends on only a ceramic support tube made of a ceramic material and preserves its strength, it may cause damage to the ceramic support tube due to external impact, thermal shock generated during heating and cooling, This may cause electrical safety problems.

SUMMARY OF THE INVENTION It is an object of the present invention, which is devised to solve the problems described above, to provide a unique assembly structure for easily assembling a resistance heat generating unit and a cylindrical thermal fuse cartridge separately manufactured, Various types of cylindrical thermal fuse cartridges can be mounted in common to various specifications. Through the socket-type auxiliary assembly cap and the cylindrical thermal fuse cartridge built in the resistance heating part, the durability of the resistance heating part is improved, And a thermosyphonic thermosynthetic fuse assembly.

The above object is achieved by the following constitutions provided in the present invention.

In the resistance heating type thermal fuse assembly according to the present invention,

A ceramic support pipe having a ceramic material having at least one open channel; A resistance heating wire wound around an outer wall of the ceramic supporting tube; And a resistance heating unit disposed on the other side of the ceramic support tube, the resistance heating unit including a first lead terminal protruded to the other side and a first lead terminal and a lead terminal cap electrically connected to the other end of the resistance heating wire;
A cylindrical thermal fuse cartridge formed so that the second lead terminal protrudes to one side, and an available fuse unit is provided between the cylindrical housing and the second lead terminal; And
The ceramic thermal fuse cartridge is inserted into the socket groove and is connected to the ceramic support tube so that at least one end of the resistance heating wire wound around the outer wall of the ceramic support tube is inserted into the socket groove, And a socket type auxiliary assembly cap for energizing the cylindrical housing of the cylindrical thermal fuse cartridge,

The socket-type auxiliary assembly cap includes a press-fit sleeve into which one outer diameter of the ceramic support tube is press-fitted, and a socket protrusion which is recessed in an entrance path of the ceramic support tube and in which a socket groove is formed.

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Preferably, the molding fluid is applied to the end of the socket-type auxiliary assembly cap which is preliminarily assembled in the socket-type auxiliary assembly cap and enters the entrance path of the resistance heating portion, and the cylindrical thermal fuse cartridge is inserted into the socket- And is fixed to the auxiliary assembly cap.

More preferably, the fusible unit comprises: a stationary cylinder barrel disposed at an end of the second lead terminal; A movable tubular member installed in the cylindrical housing in a forward and backward movement structure and brought into close contact with the stationary tubular member to energize the cylindrical housing and the fixed tubular member; A first biasing spring biasing the movable tube in a direction to separate the movable tube from the fixed tube; A second biasing spring for biasing the movable tube in a direction to close the movable tube to the fixed tube and the other end of the second biasing spring supported at one end by the movable tube, And a solenoid which releases the supported state of the torsion spring.

As described above, the resistance heating type thermal fuse assembly according to the present invention can be manufactured by inserting cylindrical thermal fuse cartridges of various sizes and capacities commonly by a resistance heat generating part having a socket type and ensuring commonality, It is possible to realize the usable disconnection of the thermal fuse cartridge.

That is, according to the resistance heating thermal fuse assembly of the present invention, various types of cylindrical thermal fuse cartridges of various sizes can be commonly inserted and installed in the entrance of the resistance heating portion by the assembled structure including the socket type auxiliary assembly cap, It is possible to reduce the manufacturing cost due to the common use of parts.

In addition, the ceramic support tube constituting the resistance heating portion is complemented by the cylindrical type auxiliary assembly cap and the cylindrical housing of the cylindrical thermal fuse cartridge, and as a result, the ceramic support tube is physically damaged by external impact or thermal shock, Degradation phenomenon can be prevented.

1 and 2 are an exploded state view and a cross-sectional view showing the entire configuration of a resistance heating type thermal fuse assembly proposed as a preferred embodiment of the present invention,
FIG. 3 is an enlarged view showing a detailed configuration of a resistance heating type thermal fuse assembly proposed as a preferred embodiment of the present invention,
4 and 5 illustrate the operation of the resistance heating type thermal fuse assembly proposed in the preferred embodiment of the present invention,
6 is a view showing the entire configuration of a thermal fuse module including a resistance heating thermal fuse assembly proposed as a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a resistance heating type thermal fuse assembly proposed as a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 are an exploded state view and a cross-sectional view showing the entire configuration of a resistance heating thermal fuse assembly proposed as a preferred embodiment of the present invention. FIG. 3 is a cross- FIGS. 4 and 5 illustrate operation states of the resistance heating type thermal fuse assembly proposed as a preferred embodiment of the present invention, and FIG. 6 is a view showing an operation state of the thermal fuse assembly according to a preferred embodiment of the present invention. And shows an overall configuration of a thermal fuse module constructed by including a resistance heating thermal fuse assembly proposed by way of example.

As shown in FIGS. 1 to 5, the resistance heating type thermal fuse assembly 1 proposed in the preferred embodiment of the present invention has resistance heating due to an overcurrent, resistance heat generation formed by protruding the first lead terminal to the other side (10); And a second fuse unit connected to the first fuse unit and the second fuse unit, the second fuse unit being connected to the first fuse unit and the second fuse unit, And a cartridge (30).

The resistance heating thermal fuse assembly 1 has a structure in which a second lead terminal 33 protrudes on one side and a first lead terminal 15 protrudes on the other side.

4, the first lead terminal 15 of the resistance heating unit 10 and the second lead terminal 33 of the cylindrical thermal fuse cartridge 30 are connected to each other When the abnormal heating of the resistance heating unit 10 is performed by the application of the overcurrent, the fuse unit 34 provided in the cylindrical thermal fuse cartridge 30 as shown in Fig. 5 is opened The circuit including the second lead terminal 33 and the first lead terminal 15 is disconnected.

In the present invention, the resistance heating unit 10 is formed as a socket type in which a general-purpose, cylindrical thermal fuse cartridge 30 is inserted without being formed integrally with a thermal fuse, Various types of cylindrical thermal fuse cartridges 30 having a housing 31 are commonly installed in the resistance heating unit 10 to form a thermal fuse assembly having various types of cylindrical thermal fuse cartridges mounted thereon.

Here, in the present embodiment, the proposed socket-type resistance heating unit 10 comprises a ceramic supporting tube 11 made of a ceramic material and having an entrance path 11a opened at one side thereof; A resistance heating line (12) wound around the outer wall of the ceramic support tube (11); And a lead terminal cap 13 disposed on the other side of the ceramic support tube 11 and connecting the first lead terminal 15 and the other end of the resistance generating line 12 wound on the outer wall of the ceramic support tube 11 do.

The ceramic support tube 11 is formed by compressing and shaping the ceramic powder, and then sintering the ceramic powder by heat treatment to have excellent heat resistance and strength.

The resistance heating wire 12 wound on the outer wall of the ceramic supporting tube 11 and the lead terminal cap 13 pressed into the other side of the ceramic supporting tube 11 are connected to an insulating mold layer Are fixed to the outer wall and the other side of the ceramic support tube (11).

In addition, the cylindrical thermal fuse cartridge 30 inserted into the socket-type resistance heating unit 10 includes a cylindrical housing 31 formed of a conductive material and having an outer diameter terminal face formed on an outer diameter thereof, A hollow insulated bushing 32 which is press-fitted and fixed to a part of the opened cylindrical housing 31, a cylindrical housing 31 energized with the first lead terminal 15 and an insulating bush 32 And an available fuse unit 34 for setting the energization state of one second lead terminal 33. [

The fuse unit 34 according to the present embodiment includes a stationary cylinder barrel 34a disposed at the end of the second lead terminal 33; A movable cylinder member 34b installed in the cylindrical housing 31 to advance and retreat into contact with the fixed cylinder member 34a and to energize the cylindrical housing 31 and the fixed cylinder member 34a; A first biasing spring 34c for biasing the movable conductive barrel 34b in a direction to separate the movable barrel 34b from the fixed barrel 34a; A second tangential spring 34d for urging the movable conductive tube 34b in a direction to come close to the fixed battery cell 34a side and a second tangential spring 34d having one end connected to the other end of the second tangential spring 34d supported by the movable battery cell 34b And a solute 34e which melts when heated to a temperature equal to or higher than the set temperature and releases the second torsion spring 34d.

Therefore, in the state where the usable material 34e is not melted, the movable conductive tube 34b is brought into close contact with the fixed tube 34a by the linting force provided by the second tipping spring 34d as shown in Fig. 4, The lead terminal 15 and the second lead terminal 33 are connected.

When the soluble matter 34e is heated to a temperature higher than the set temperature by the heat provided by the resistance heating unit 10 and melted, the movable tube member 34b is rotated by the elastic force of the first torsion spring 34c The first lead terminal 15 and the second lead terminal 33 are disconnected from each other and separated from the fixed battery cell 34a.

In this embodiment, a press-in rod 31b made of a conductor is formed at the other end of the cylindrical housing 31 so that the cylinder-shaped auxiliary housing 31 is inserted into the socket groove 21 of the socket- The fuse cartridge 30 is press-fitted into the press-fit duct 23 formed in the socket-like auxiliary assembly cap 20 through the press-in rod 31b to form a more stable energized state with the socket- And is fixed in position in the socket groove 21 of the socket-type auxiliary assembly cap 20.

According to the present embodiment, the press-in rod 31b is a rod having a rivet end portion 31b-a formed at its end, and the rivet end portion 31b-a is inserted into the fixing hole 31b- (31a), and then the end portion is expanded through compression to protrude to the rear of the cylindrical housing (31).

In the meantime, in the present invention, a socket-type auxiliary assembly (not shown) for commonly mounting and assembling a cylindrical thermal fuse cartridge 30 of various sizes configured as described above to the entry path 11a formed in the resistance heating unit 10, The cap 20 is newly proposed and adopted so that the cylindrical thermal fuse cartridge 30 having various specifications is assembled and accommodated in the resistance heating unit in a form of a mold.

The socket type auxiliary assembly cap 20 is formed of a press molded product by drawing a metal plate so as to fix the cylindrical thermal fuse cartridge 30 to the resistance heating unit 10 to fix the first lead terminal 15, The resistance heating wire 12 formed in the resistance heating portion 10 and the cylindrical thermal fuse cartridge 30 having the first lead terminal 15 are energized.

According to the present embodiment, the socket-type auxiliary assembly cap 20 is formed of a conductive cap body having a socket groove 21 opened at one side thereof, and is inserted into the access passage 11a of the ceramic support tube 11. [

That is, the socket-type auxiliary assembly cap 20 is forcedly inserted into the ramp 11a of the ceramic support tube 11 inside the press-fitting sleeve 20a which is press-fitted into the outer diameter of one piece of the ceramic support tube 11, And the socket protrusion 20b formed with the protrusion 21 is protruded.

The socket type auxiliary assembly cap 20 is connected to the other end of the resistance heating wire 12 wound on the outer wall of the ceramic support tube 11 to form a current conduction state with the first lead terminal.

The thermal fuse cartridge 30 inserted into the socket groove 21 is inserted into the socket groove 21 through the press-fitting pipe 31b formed at the other end of the thermal fuse cartridge 30, (23) so as to be preliminarily fixed.

In this embodiment, the socket protrusion 20b of the auxiliary assembly cap 20 inserted with the cylindrical thermal fuse cartridge 30 is locally press-fitted to form the inwardly protruding tab protrusion 22, So that the insulating bushing 32 of the cylindrical thermal fuse cartridge 30 inserted in the socket groove 21 of the heat sink 20 is fastened by the fastener 22.

Meanwhile, the manufacturing process of the thus configured thermal fuse assembly 1 will be described in detail.

The first operator inserts the cylindrical thermal fuse cartridge 30 into the socket groove 21 of the socket-type auxiliary assembly cap 20 and preassembles it.

At this time, the press-in rod 31b protruding from the rear side of the cylindrical thermal fuse cartridge 30 is press-fitted into the press-in pipe 23 formed in the socket-type auxiliary assembly cap 20, Assembled in the socket groove 21 of the socket-type auxiliary assembly cap 20 in a concentric manner.

Subsequently, the operator locally presses the outer wall of the stacked socket-type auxiliary assembly cap 20 with the insulating bush 32 of the cylindrical thermal fuse cartridge 30 and presses it inwardly by the fastener 22 projecting inwardly by press- So that the insulating bushing 32 of the cylindrical thermal fuse cartridge 30 is securely fixed.

Therefore, the cylindrical thermal fuse cartridge 30 inserted in the socket groove 21 of the socket-type auxiliary assembly cap 20 is centered through the press-in rod 31b and is fixed by the fastening of the fastener 22 Assembled in the socket groove 21 of the socket-type auxiliary assembly cap 20 and preassembled.

After that, the operator inserts the socket type auxiliary assembly cap 20 preliminarily assembled with the cylindrical thermal fuse cartridge 30 into the access path 11a formed in the resistance heating unit 10, An epoxy resin as an insulating molding liquid is applied to the outer wall of the ceramic support tube 11 on which the resistance heating lines 12 are wound and the stable heating of the resistance heating line 12 is performed by the insulating mold layer 14, Type thermal fuse cartridge 30 is sealed.

The resistance heating portion 10 is formed such that a resistance heating wire 12 is wound on the outer wall of the ceramic supporting tube 11 and a lead terminal cap 13 is disposed on the other side. Forms a contact with the socket-type auxiliary assembly cap 20 to form a current-carrying state.

Therefore, the cylindrical thermal fuse cartridge 30 forms a current-carrying state with the resistance heating line 12 connected to the first lead terminal 15 through the socket-type auxiliary assembly cap 20 inserted in the ceramic support tube 11 As a result, the first lead terminal 15 of the resistance heating portion 10 and the second lead terminal 33 of the cylindrical thermal fuse cartridge 30 are interconnected to form an energized state.

Thus, the resistance heating portion 10 and the cylindrical thermal fuse cartridge 20 are connected in series and the current flows through the first lead terminal 15, the lead terminal cap 13, the resistance heating wire 12, The assembling cap 20, the housing 31 of the cylindrical thermal fuse cartridge, the movable tube member 34b, the fixed tube member 34a and the second lead terminal 33 in this order.

When the ceramic support tube 11, which is accommodated by inserting the cylindrical thermal fuse cartridge 30 by heating the resistance heating line 12 by applying an overcurrent to the circuit, is heated to exceed the preset temperature value, The soluble matter 34e of the fusible unit 34 disposed in the fusing unit 30 is melted and the one side lubrication force of the movable conductive piece 34b by the second torsion spring 34d is lost.

At this time, the movable electric conductive piece 34b forming the contact with the fixed electric tube 34a moves to the other side due to the elastic force of the first elastic spring 34c and the contact with the fixed electric battery piece 34a is lost, As a result, the first lead terminal 15 and the second lead terminal 33 are disconnected.

Thus, damage to the circuit (not shown) due to the application of the overcurrent and electrical damage to the electronic device (not shown) including the circuit are prevented. Also, the first lead terminal 15 and the second lead terminal The first lead terminal 15 and the second lead terminal 33 are not adjacent to each other and form a series arrangement in which the first lead terminal 15 and the second lead terminal 33 are spaced apart from each other and have improved electrical stability.

In addition, the present invention proposes a thermal fuse module 100 including such a thermal fuse assembly 1.

6, the thermal fuse module 100 includes a thermal fuse assembly 1 housed in a ceramic housing 110 having an open top, and then subjected to a mold process to form a thermal fuse assembly 1 on one side of the upper portion of the ceramic housing, The first lead terminal of the assembly and the connector piece 120 energized with the second lead terminal are formed so as to protrude from the first lead terminal and the second lead terminal, respectively.

That is, the connector piece 120 is disposed on the first lead terminal 15 and the second lead terminal 33 which are disposed so as to be spaced apart from each other, and the thermal fuse assembly 1, in which the connector pieces 120 are disposed, In the opened ceramic housing 110.

In this state, the operator injects the mold liquid into the ceramic housing 110 so that the impregnated thermal fuse assembly 1 is immersed in the mold layer 130 with the mold liquid being hardened.

The connector pieces 120 formed on the right and left sides of the thermal fuse assembly 1 are protruded upward from the upper portion of the mold layer 130 so that the connector pieces 120 fixed to the upper portion of the ceramic housing 110 by the mold layer 120 are spaced apart from each other to form a thermal fuse module 100.

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1. Thermal fuse assembly
10. Resistance heating part 11. Ceramic support tube
11a. access
12. Resistance heating wire 13. Lead terminal cap
14. Heat-resistant mold layer 15. First lead terminal
20. Socket-type auxiliary assembly cap 20a. Press-fit sleeve
20b. Socket projection
21. Socket Home
22. Mounting projection 23. Mounting line
30. Cylindrical thermal fuse cartridge 31. Cylindrical housing
31a. Fixed ball 31b. Indent
31b-a. Rivet tofu
32. Insulation Bush
33. Second lead terminal 34. Available fuse unit
34a. Fixed tube sleeve 34b. Movable tube sleeve
34c. The first urging spring 34d. The second tangential spring
34e. Solubility
100. Thermal Fuse Module
110. Ceramic housing 120. Connector piece
130. Mold

Claims (3)

A ceramic support pipe having a ceramic material having at least one open channel; A resistance heating wire wound around an outer wall of the ceramic supporting tube; And a resistance heating unit disposed on the other side of the ceramic support tube, the resistance heating unit including a first lead terminal protruded to the other side and a first lead terminal and a lead terminal cap electrically connected to the other end of the resistance heating wire;
A cylindrical thermal fuse cartridge formed so that the second lead terminal protrudes to one side, and an available fuse unit is provided between the cylindrical housing and the second lead terminal; And
The ceramic thermal fuse cartridge is inserted into the socket groove and is connected to the ceramic support tube so that at least one end of the resistance heating wire wound around the outer wall of the ceramic support tube is inserted into the socket groove, And a socket type auxiliary assembly cap for energizing the cylindrical housing of the cylindrical thermal fuse cartridge,
Wherein the socket type auxiliary assembly cap includes a press-fit sleeve into which one outer diameter of the ceramic support tube is press-fitted, and a socket protrusion which is forcedly inserted into the entrance of the ceramic support tube and in which a socket groove is formed. Type thermal fuse assembly. The method as claimed in claim 1, wherein a molding fluid is applied to an end portion of the socket-type auxiliary assembly cap which is preliminarily assembled to the socket-type auxiliary assembly cap and enters the entrance path of the resistance-heating portion, Type auxiliary assembly cap, and is configured to be fixed to the socket-type auxiliary assembly cap. The fuse unit as claimed in claim 1, further comprising: a stationary cylinder barrel disposed at an end of the second lead terminal; A movable tubular member installed in the cylindrical housing in a forward and backward movement structure and brought into close contact with the stationary tubular member to energize the cylindrical housing and the fixed tubular member; A first biasing spring biasing the movable tube in a direction to separate the movable tube from the fixed tube; A second biasing spring for biasing the movable tube in a direction to close the movable tube to the fixed tube and the other end of the second biasing spring supported at one end by the movable tube, And a solenoid for releasing the supporting state of the torsion spring.

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