KR100283317B1 - Temperature sensitive element - Google Patents

Abstract

The present invention relates to a temperature sensitive element for connecting an electric power line to operate an alarm or a specific load when the temperature is higher than an appropriate temperature. The present invention relates to a compression spring (3) and a first contact plate inside a conductive case (2). (4), a fusible pellet (5) and an insulator bush (6) are provided, and the first contact lead wire (1) and the second contact lead wire (8) are connected to both ends of the conductive case (2). . The second contact lead wire 8, the bush 6, and the conductive case 2 are fixed and bonded with the sealing agent 7. According to this configuration, the fuselable pellets 5 are insulated when the rated sensing temperature is not reached and are melted when the rated sensing temperature is transmitted through the conductive case 2. Accordingly, the contact plate 4 moved by the elastic force of the compression spring 3 connected to the first contact lead wire 1 is in contact with the second contact lead wire 8 so that power is supplied. The temperature-sensitive device of the present invention can be supplied without blocking the electrical signal during heat detection due to fire, and also can be inserted in various ways depending on the temperature to detect the fused pellet (5), the designer's choice I can do it freely. In addition, the temperature sensitive device of the present invention has a simple structure, which is a small component compared to the prior art, and is inexpensive, can prevent malfunction of the circuit due to changes in the sensing temperature over time, and has a high detection accuracy. .

Description

Temperature sensitive element

The present invention relates to a device for sensing the temperature used in the fields of fire alarm, automatic fire extinguisher, overheat alarm, smoke alarm, evacuation signal, and the like, in particular, when the temperature exceeds a predetermined predetermined temperature, the power is not cut off the power supply It relates to a temperature sensitive device for connecting the.

In general, fire alarms, automatic fire extinguishers installed in large or small buildings, or overheat alarms used in various electronic products have used various elements to sense temperature to prevent fire or product damage.

As an example of such an element, a bimetal element is used by dimmers, heaters, and the like, by welding or brazing two sheets of metal plates having different thermal expansion coefficients, and automatically opening and closing the electrical contact according to the temperature. However, such a bimetal element has a problem in that there are no various types that can be freely selected in an electronic product considering a structure of a very narrow place due to its large volume.

In addition, as another example, a temperature sensor made of a thermocouple, a dummyistor, a platinum resistance thermometer, and the like has been used in various electronic products. Dummysters, which are well known among them, are temperature-sensitive resistors, and the electrical resistance changes significantly with temperature. Its characteristics include NTC dummy temperature (NTC dummy thermistor), which decreases the resistance value as temperature rises, and PTC temperature (positive temperature coefficient efficient), which works in reverse. However, such a temperature sensor detects whether the temperature changing due to fire or overheating within a predetermined space deviates from a predetermined upper limit (or lower limit), and according to the detected signal, an electrical short circuit with the surrounding electronic circuit, that is, a power supply. It has been used mainly for blocking.

However, in order to use such a temperature sensor for a long time, it is necessary to be installed in various fire alarms or overheat alarms in consideration of the change over time. The reason for this is that, if the change over time exceeds the minimum subdivision scale (resolution) of the sensor, it can be said that the life is over. Therefore, the temperature sensor must always take into account changes over time in the sensed temperature. This is because the detection accuracy is lowered due to the change of the temperature sensor over time (for example, detection temperature ± 6 ° C), and there is a problem in stability that a fire alarm, an overheat alarm, or the like may cause a malfunction. Of course, the installer needs to correct or replace the error caused by the time-dependent change of the temperature sensor at every regular inspection, but the waste of service personnel for the calibration is caused, and the cost of replacing the expensive temperature sensor is large. There were problems.

In addition, in order to measure and control the temperature by attaching the temperature sensor to various electronic products, it is important to capture what temperature, what part of the temperature, and how to capture the temperature. However, in the prior art, there is a lack of a kind of temperature sensor to accurately capture a desired temperature, it was not possible to select a variety of temperature sensor according to the sensing distance in the place to sense heat, and to process the signal detected by the temperature sensor There is a complex configuration problem that must accompany the peripheral circuit configuration.

As described above, in the prior art, a bimetal element, a temperature sensor, or an electronic circuit is used to energize power by heat (temperature) sensing, which is bulky, complicated structure, high in price, and according to changes in sensing temperature over time. There was a problem that a malfunction occurred, its detection accuracy was low, and various types of sensing temperatures that could be freely selected in consideration of the structure of the place to detect heat, the sensing distance, and the like were limited.

Therefore, in order to solve the above problems, the present invention is not a concept of shutting off power when abnormal heat is generated as in the prior art, but a concept of supplying power in response to heat when heat above a predetermined limit temperature is generated. One purpose is to provide a temperature sensitive element.

Another object of the present invention is much smaller in volume than the prior art devices, simple structure such as resistance, very low price, no change in detection temperature over time, eliminating the cause of circuit malfunction, high detection accuracy, The purpose of the present invention is to allow various types of temperature to be finely selected according to the structure of the place where the heat is to be sensed and the sensing distance.

1 is a perspective view of a temperature sensitive device according to the present invention;

2 is an exploded cross-sectional view according to the present invention;

3 is an assembled cross-sectional view of a temperature sensitive device,

(a) is a state of assembly before the temperature sensitive element operation,

(b) is a state of assembly after the operation of the temperature sensitive element.

* Explanation of symbols for main parts of the drawings

1,8: 1st and 2nd contact lead wire

2: conductive case 3: compression spring

4: first contact plate 5: fusible pellet

6: insulator bush 7: sealant

8a: contact protrusion 8b: second contact plate

8c: contact plate fixing and connecting rod

The temperature sensitive element of the present invention for achieving the above object, the first electrical connection means connected to an external power source or load side is electrically connected to the conductive case fixed to one end, and installed inside the case Conductive elastic means electrically connected with the first electrical connection means and having elastic force, conductive contact means in close contact with the conductive elastic means and electrically connected thereto, the conductive contact means being movably installed in the case by the elastic force of the elastic means; Insulation fixing means for fixing and coupling the second electrical connection means connected to an external load or power supply side to the other end of the conductive case while being electrically insulated from the conductive case, and the second electrical connection means and the Inserted between the contact means to maintain insulation and above rated temperature It is melted when the heat is transferred to the contact means and the second electrical connecting means by the restoring force of the elastic means to be in contact with the first and second electrical connecting means to constitute a heat-sensitive molten member for energizing between It features.

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

1 is a perspective view of a temperature sensitive device of the present invention, the size of which is similar to the size of a resistor (commonly used for electronic components). 2 is an exploded cross-sectional view of the temperature sensitive element.

The assembled cross-sectional configuration of the temperature sensitive element according to this will be described with reference to FIG.

3 (a) is a state diagram before the operation of the present device, and (b) is a state diagram after the operation. These temperature sensitive elements are connected to be positioned between the two contacts for which temperature sensing of various electronic circuits is required.

Accordingly, reference numerals '1' and '8' shown in FIG. 3 (a) are first and second contact lead wires using oxygen-free copper, and '2' is a conductive case made of brass. '3' represents a compression spring made of stainless steel wire, '4' represents a first contact plate made of phosphorus, '6' represents an insulator bush made of ceramic, and '7' represents an encapsulant made of epoxy. In addition, reference numeral '5' is a fusible pellet, and mainly uses an organic compound selectively according to various and minute sensing temperatures desired by a user. As an example of the organic substance, p-benzidine or 4,4-diamino biphenyl (melting point: 128 ° C), benzyl dioxime (amplified) or α-benzyl dioxime (melting point: 164 to 166 ° C), and benzyl Examples include monooxime (α) (melting point: 137-138 ° C), benzoimidazole or 1,3-benzodiazole (melting point: 170.5 ° C), 2-amino benzoimidazole (melting point: 224 ° C), and the like. have. In addition, it is also possible to use a mixture of inorganic materials to these organic materials. In addition, the fusible pellets 5 react accurately within the rated temperature ± 2 ° C, and the operation is an insulator in a solid state.

Accordingly, referring to FIG. 3 (a), the configuration thereof includes a first contact lead wire 1 and a first contact lead wire, which are first electrical connection means for inputting (or outputting) an electrical signal. 1) and a contact plate, which is a contact means that is in close contact with one end of the compression spring (3), which is an elastic means having elastic force, and is in contact with the other end of the compression spring (3), and is moved by the elastic force of the compression spring (3). (4; hereinafter, the first contact plate) and the first contact plate (4), attached to the first contact plate (4), while maintaining the insulation state below the rated temperature, melted when the temperature is above the rated temperature, the first contact plate 4 and the second contact The fusible pellets 5, which are thermally melted members for contacting one end of the lead wire 8, and the fusible pellets 5 in an insulated state are adhered to each other. When it melts, it comes into contact with the first contact plate 4 in close contact with the fusible pellet 5. The second contact lead wire 8, which is a second electrical connecting means for outputting (or inputting) an electrical signal, and the second contact lead wire 8 are inserted and fixed, and insulation is maintained from the conductive case 2. And an insulator bush 6 that mitigates the impact of the compression spring 3 by the elastic force, and one end of the first contact lead wire 1 is compressed and adhered therein, and a second contact is made. A conductive case 2 for enclosing and fixing the insulator bush 6, the compression spring 3, the first contact plate 4, and the fused pellet 5 in which the lead wire 8 is inserted, and transmitting an external temperature change. ) And an encapsulant 7 for fixing and bonding the conductive case 2, the bush 6, and the second contact lead wire 8.

Here, the specific structure of the 2nd contact lead wire 8 includes the contact protrusion 8a which fixes the fused pellet 5 below the rated temperature, and directly contacts the 1st contact plate 4 above the rated temperature, The contact protrusion 8a is formed in the center, and transmits the elastic force by the spring at the time of contacting the first contact plate 4 to one side of the insulator bush 6 to mitigate the impact. The contact plate 8b and the contact plate fixing and connecting table 8c for transmitting an electrical signal while adhering to and fixing the second contact plate 8b are integrally formed.

The conductive case 2 has a structure in which one end of the first contact lead wire 1 is brought into close contact with the hole, and the insulator bush 6 is formed without being separated. In addition, the contact protrusion 8a has a sharp protrusion shape in case the fused pellet 5 is melted and stuck to the first contact plate 4 to form a film.

The operation of the temperature sensitive element according to such a configuration will be described with reference to FIGS. 3A and 3B.

This temperature sensitive element is attached to each electronic circuit such as fire alarm, automatic fire extinguisher, overheat alarm, heating signal, evacuation signal, etc., and is used between electrical signal input and output which requires specific temperature sensing. At this time, it is possible to selectively use the temperature sensitive device of the present invention that can sense a variety of temperatures in consideration of the structure, the sensing distance, etc. of the place to sense heat.

Accordingly, the first contact lead wire 1 is connected to the electrical signal input terminal and the second contact lead wire 8 is connected to the electrical signal output terminal. In the connected state, if there is no temperature change due to external fire or abnormal heat generation, the fuselable pellet 5 maintains an insulating state as shown in FIG.

That is, the compression spring 3 is in a compressed state, and the first contact lead wire 1 and the second contact lead wire 8 are insulated.

However, when external heat is transferred through the conductive case 2 in response to a fire or abnormal heat generation, the fuselable pellets 5 having received the heat are melted, and the first contact plate adhered to the fusible pellets 5. (4) is pushed by the elastic force of the compression spring (3) and is in contact with the contact projection (8a) provided in the second contact lead wire (8). That is, the first contact lead wire 1 and the second contact lead wire 8 are connected to supply an electrical signal. This is as shown in Figure 3 (b).

The temperature-sensitive device of the present invention operating as described above senses heat because it can sense up to a minute and various temperatures in the range of 58 ° C to 238 ° C by changing the type of organic material of the fused pellet 5 according to the use. The designer can choose freely according to the structure of the place to be or the sensing distance. In addition, the characteristics of the temperature-sensitive device of the present invention is excellent in insulation performance, reacts accurately within a rated temperature of ± 2 ℃, excellent thermal durability that is not energized even after 168 hours at a rated temperature of -10 ℃, between the anode The withstand voltage is excellent in the withstand voltage characteristics when an AC voltage that is twice the rated voltage is applied.

Such a temperature-sensitive device of the present invention can be used for fire alarms, automatic fire extinguishers, overheat alarms, evacuation signal and the like.

The temperature sensitive device of the present invention as described above has the following effects as compared to the device of the prior art.

First, it is advantageous to be installed in a circuit structure of a place where power is supplied without disconnecting power, and also various kinds of temperature sensitive elements can be freely selected by a designer according to various sensing temperatures required at the place.

Second, since the volume is very small and simple structure, a miniaturized circuit can be manufactured, and the cost of components due to miniaturization can be very low.

Third, there is no change over time of the sensing temperature, thereby preventing malfunction of the circuit.

Fourth, the error with respect to the detection temperature is ± 2 ℃, the detection accuracy is high.

Claims (3)

A first electrical connection means connected to an external power source or load side is electrically connected and fixedly coupled to one end, and a conductive elastic installed inside the case and electrically connected to the first electrical connection means and having elastic force. The conductive contact means is electrically connected in close contact with the conductive elastic means, the conductive contact means is installed to be movable inside the case by the elastic force of the elastic means, and the second electrical connection means connected to an external load or the power supply side. An insulating fixing means for fixedly coupling to the other end of the conductive case while being electrically insulated from the case, and inserted between the second electrical connecting means and the contacting means to maintain an insulating state, When heat is transferred, it melts and is brought into contact with the elastic force Contacting the contact means and the second electrical connection means, it characterized in that the temperature sensitive device consisting of the thermal melting member for a power application cycle by the first and second electrical connection means. The method of claim 1, wherein the insulating fastening means comprises a bush for inserting and fixing the second electrical connection means, the bushing, the end of the second electrical connection means and an encapsulant for molding the conductive case. A temperature sensitive element characterized by the above. The temperature sensitive device according to claim 1, wherein the thermally sensitive melting member is made of any one of a plurality of insulating materials which are melted corresponding to a sensing temperature.