KR101106263B1 - Un-ground thermo couple - Google Patents

Abstract

The present invention uses the epoxy means to close the thermocouple ends in a sleeve covering the two cores made of different metals of an ungrounded thermocouple temperature sensor and the electrical connection of the + and-power supply wires. The sealing relates to a temperature sensor using a non-grounded thermocouple that can maintain the insulation resistance in the grounded thermocouple temperature sensor indefinitely to block the contact failure of the contact source and improve the reliability of the product. will be. To this end, the temperature sensor using the non-grounded thermocouple includes: a wire-shaped SUS protective tube, two core wires, a temperature sensing unit as a contact point, and an electrode unit including an MgO insulator; Epoxy to seal the finish at the other end of the wire-shaped SUS protection tube, the other end of the two core wires protrude outward; + And-power supply lines electrically connected to the other ends of the two core wires protruding through the epoxy to supply power; And a handle portion which allows the user to grip the cover while protecting the epoxy and the other ends of the two core wires electrically connected to each other and a part of the + and − power supply lines.

Thermocouple, temperature sensor

Description

Temperature sensor using non-grounded thermocouple {UN-GROUND THERMO COUPLE}

The present invention relates to a temperature sensor using an ungrounded thermocouple, and more particularly, to cover two core wires made of different metals of an ungrounded thermocouple temperature sensor and an electrical connection portion of a + and-power supply wire. By closing and sealing the thermocouple end part using epoxy means in the sleeve, the insulation resistance in the grounded thermocouple temperature sensor is continuously maintained at infinity, thereby blocking the contact failure of the contact source and improving the reliability of the product. The present invention relates to a temperature sensor using an ungrounded thermocouple capable of high height.

In general, a thermocouple is a device for measuring temperature by joining two different metal wires together. More specifically, a thermocouple electrically connects two ends of two types of metal conductors and gives a temperature difference between the two types of conductors to generate a Seebeck effect through which a current flows in the circuit, and at this time, maintains a temperature at one end (reference contact point) It is a device that can measure the temperature of the other end (temperature contact point) by measuring the value of the thermoelectric power.

The thermocouple of this principle is relatively simple in structure and can measure a wide range of temperature from cryogenic -200 ℃ to super high temperature 3000 ℃, so that not only various industrial temperature measurement (hot ruuner of mold) but also medical temperature measurement It is also used a lot.

The thermocouple is classified into a general thermocouple and a sheath thermocouple according to the type of protection of the thermocouple element in which the temperature-contacting point is formed. General thermocouples are composed of combined protective tube, thermocouple wire, insulated tube, and terminal box, whereas sheath thermocouple composed of insulation material such as protective tube, thermocouple wire, magnesium oxide (MgO) has good mechanical durability and can be bent arbitrarily. It is used more than general thermocouple because of its characteristics.

The sheath thermocouple may be divided into a grounded type or a non-grounded type depending on whether the thermocouple element is grounded to the metal protective tube. The grounding type is a form in which a thermocouple element is directly welded to the tip of a sheath to form a temperature-contacting contact. It is fast in response and suitable for measuring temperature under high temperature and high pressure. The non-grounding type is a type that completely insulates the thermocouple wires from the sheath and forms a temperature-contacting contact. It has little change in thermoelectric power over time and can withstand long-term use. It can also be used safely in hazardous locations without being affected by noise voltage. Furthermore, if an insulation ohmmeter is installed on a pair of thermocouple wires, there is an advantage that the insulation resistance of the insulation material can be easily measured.

By the way, the non-grounded sheath thermocouple having various advantages as described above is very difficult and complicated to weld the fine thermocouple element inside the sheath to make the temperature measurement contact point, which is a situation in which expensive finished products are mostly imported from foreign countries. In particular, sheath diameter tends to be minimized in the form of wires, which requires more and more advanced technology.

Moreover, in the case of minimizing the electrodes in this way, it is absolutely necessary to keep the insulation resistance in the electrodes of the non-grounded sheath thermocouple to infinity, and in the related art, it is very difficult and complicated to maintain the insulation resistance continuously. There is a problem that the productivity is lowered due to the increase of defective products.

Accordingly, an object of the present invention is to eliminate the above problems, and to provide an epoxy means in a sleeve covering the electrical connections of the + and-power supply wires with two cores made of different metals of an ungrounded thermocouple temperature sensor. By closing and sealing the end of the thermocouple, the insulation resistance in the grounded thermocouple temperature sensor is continuously maintained at infinity to provide a temperature sensor using a non-grounded thermocouple that can improve the reliability of the product by blocking the contact failure of the contact source. will be.

The temperature sensor using a non-grounded thermocouple according to the present invention for achieving the above object, in the temperature sensor using a non-grounded thermocouple, is symmetrically opposed to the center of the wire-shaped SUS protection tube and the wire-shaped SUS protection tube Two core wires made of different metals formed in a longitudinal direction, and a temperature sensing part as a contact point formed by welding each end of two core wires in one side of the wire-shaped SUS protective tube, and A wire-shaped electrode part made of an MgO insulator filled at a predetermined interval based on the two core wires in a wire-shaped SUS protective tube; Epoxy to seal the finish at the other end of the wire-shaped SUS protection tube, the other end of the two core wires protrude outward; + And-power supply lines which are electrically connected to the other ends of the two core wires extending through the epoxy to supply power; And a handle portion which allows the user to grip the cover while protecting the epoxy and the other ends of the two core wires electrically connected to each other and a part of the + and − power supply lines.

Here, the handle portion, the other ends of the two core wires protruding from the epoxy closed and sealed at the other end of the wire-shaped protective tube and the + and-power supply wires connected to the + and-power supply line It is preferable that the sleeve is closed and covered in an electrically connected state, and an epoxy support that supports the epoxy so that the other side of the wire-shaped protective tube and the two core wires do not contact each other at one side of the sleeve.

In addition, the other end of the two core wires are extended and protruded by the epoxy is electrically connected to the outside + and-power supply line through the + and-power supply wire of the bundle form, the + and -It is preferable that the power supply wire and the other ends of the two core wires are fixedly connected by surface contact by applying a constant force in the state of winding each other through a fixed housing.

Moreover, it is preferable that the inner diameter of the said wire-shaped electrode part is 0.25 mm-0.7 mm.

According to the temperature sensor using the non-grounded thermocouple according to the present invention configured as described above, the two ground wires made of different metals of the ungrounded thermocouple temperature sensor (unground thermo couple) and the electrical connection of the + and-power supply wire cover By closing and sealing the thermocouple end part using epoxy means in the sleeve, the insulation resistance in the grounded thermocouple temperature sensor is continuously maintained at infinity, thereby preventing the contact failure of the contact source and improving the stability and reliability of the product. There is.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a schematic cross-sectional view of a temperature sensor using a non-grounded thermocouple according to the present invention, Figure 2a is an enlarged cross-sectional view of the "A" portion of Figure 1, Figure 2b is an enlarged cross-sectional view of the "B" portion of Figure 1, 3A to 3D are cross-sectional views illustrating a process of manufacturing a temperature sensor using a non-grounded thermocouple according to the present invention after cutting a wire-shaped electrode part drawn in the form of a wire of fine lines to a certain length, for convenience of description. do.

As shown, the temperature sensor 100 using an ungrounded thermal couple according to the present invention, the wire-shaped electrode portion 10 as an ungrounded thermal couple temperature sensor, and the user's hand It consists of a handle portion 20 for easy gripping and a + and-power supply line 40; 41, 42 electrically connected to the wire-shaped electrode portion 10 to supply power. .

Here, the wire-shaped electrode portion 10 has a thin thickness with an inner diameter of approximately 0.25 mm to 0.7 mm (preferably approximately 5 mm) and is inserted into a hot runner side of a mold. It is mainly used to measure the temperature of the hot runner in real time. However, the temperature measurement object using the wire-shaped electrode portion 10 according to the present invention can be variously applied to industrial or medical devices in addition to the hot runner described above.

The wire-shaped electrode portion 10 includes two core wires symmetrically formed in the longitudinal direction at the center of the wire-shaped SUS protective tube 11 and the wire-shaped SUS protective tube 11 ( 12) 13 and MgO insulator 15 filled in the wire-shaped SUS protective tube 11 at regular intervals based on the two core wires 12 and 13.

Here, one side end of the wire-shaped SUS protective tube 11 is formed with a sealing portion 16 to be welded and sealed at the time of manufacture.

In addition, one end of the two core wires 12 and 13 is welded using a known laser to form a temperature sensing unit 14 so as to detect a real time temperature of a hot runner (not shown). .

Here, the two core wires 12 and 13 are metals of different types, and temperature sensing units 14 as contacts are formed at both ends, and two + and − power supply lines 41 and 42 to be described later are provided. Power is supplied through the electromotive force is generated at the contact point 14, through the electromotive force is converted into a temperature value (volts (V) or Celsius and Fahrenheit) so that the operator can visually confirm. This type of temperature sensor is referred to as an ungrounded thermocouple, and this non-grounded thermocouple is a well-known technique, and thus, further description thereof will be omitted.

Each of the other ends of the two different metal wires, the core wires 12 and 13, is + and-power supply wires 41-1 and 42-1 in the bar-shaped handle portion 20, as described later. It is electrically connected to the + and-power supply line (41, 42) is supplied with power to sense the temperature of the hot runner (not shown) in real time in the temperature sensing unit 14 as a thermal couple (Thermal Couple) It is intended to be read.

The cylindrical SUS protective tube 11 is made of SUS (preferably SUS 316), and serves to protect the core wires 12 and 13 which are other metal wires inside, and also at high temperature and high pressure. It is durable and has the advantage of maintaining long life. Here, although the material of the SUS protective tube 11 is preferably SUS, Inconel or hapronickel may also be used.

In addition, the MgO insulator 15 is a non-metallic object that conducts temperature, and serves to protect the insulation resistance, thereby preventing the temperature from being hunted at the high frequency output. Will be performed.

Here, the SUS protective tube 10, which actually forms the outer shape of the electrode portion 10, has a considerable thickness at the beginning of its manufacture, and can be drawn out with a fine wire line of about 0.5 mm having a temperature sensor embedded therein through a drawing process or the like. In this way, the wire-shaped electrode portion 10 drawn by the fine lines is cut to a predetermined length through a known wire cutting technique and the like, and applied to the temperature sensor 100 using the non-grounded thermocouple according to the present invention.

The rod-shaped handle portion 20 serves to allow the user to easily grip the wire-shaped electrode portion 10 to easily insert into the hot runner (not shown) region of the mold.

When explaining the structure of the handle portion 20 in more detail, the handle portion 20, two protruding extending from the epoxy 30 is closed and sealed at the other end of the wire-shaped protective tube 10. The other ends of the four core wires 12 and 13 and the + and − power supply wires 41-1 and 42-1 connected to the + and − power supply lines 40 and 41 and 42, respectively. The epoxy 30 is sealed so as to cover the sleeve 21 and the other side of the wire-shaped protective tube 10 and the two core wires 12 and 13 in the sleeve 21 so as not to contact each other. It consists of a ring-shaped epoxy support 22.

The epoxy 30 not only can withstand high temperatures but also maintains the insulation resistance of the protective tube 10 and the two core wires 12 and 13 at infinity to serve as a source blocker for poor contact of the contacts. do.

Here, the other ends of the two core wires 12 and 13, which are sealed and protruded with epoxy 30, are supplied with the + and − powers of the outside through the + and − power supply wires 41-1 and 42-1. Electrically connected by lines 41 and 42, and fixing the other ends of the + and − power supply wires 41-1 and 42-1 in the form of a bundle and the two cores 12 and 13, respectively. By being fixedly connected by surface contact by applying a predetermined force in the rolled-up state through the housing 50, it is possible to establish a rigid electrical fixed connection than the electrical connection of the conventional point contact.

On the other hand, after cutting the wire-shaped electrode portion 10 drawn by a fine line to a predetermined length as described above, a process for manufacturing a temperature sensor 100 using a non-grounding thermocouple according to the present invention is shown in Figure 3a to Briefly described with reference to Figure 3d as follows.

First, as shown in FIG. 3A, the other end portion of the wire-shaped SUS protective tube 10 is partially peeled off using a known wire stripper, so that the ends of the two core wires 12 and 13 are moved outward. The exposed ends of the MgO insulator 15 remain exposed while being exposed.

Subsequently, as shown in FIG. 3B, the wire-shaped SUS protective tube 10 having been stripped and exposed at the ends of the two core wires 12 and 13 to the outside is dried at a temperature of about 150 ° C. for about 1 to 3 hours. 건조) Dry inside to completely remove moisture from inside to maintain insulation resistance at infinity. At this time, by testing with a known insulation resistance tester, the failure of the insulation resistance is infinite or less.

Subsequently, as shown in FIG. 3B, the end of the MgO insulator 15 exposed at the other end of the wire-shaped SUS protective tube 10 is closed and sealed with an epoxy 30 to be cured in the drying furnace in such a state. ) Of course, the two cores 12 and 13 protrude outward from the epoxy 30 so that electrical contact is made as in a subsequent process.

At this time, as shown in Figure 3b, using the ring-shaped epoxy support 22 on one side of the sleeve 21 through which the SUS protective tube 10 is inserted and the other side of the wire-shaped SUS protective tube 10 and The two cores 12 and 13 support the epoxy 30 so that they do not abut each other.

As such, when sealed with epoxy 30, the insulation resistance in the wire-shaped electrode portion 10 is maintained and the temperature can be sustained without changing the structure up to a high temperature of 220 degrees or more.

Then, as shown in FIG. 3C, the ends of the two core wires 12 and 13 sealed and exposed with epoxy 30 at the other side of the wire-shaped SUS protective tube 10 and a bundle of + and − power sources. The supply wires 41-1 and 42-1 are respectively fixedly connected by surface contact by applying a predetermined force in a state of being rolled up and wound through the fixing housing 50.

Subsequently, as shown in FIG. 3D, as described above, the other end of the two core wires 12 and 13 sealed and extended with the epoxy 30 using the sleeve 21 and the power supply line 40. The + and − power supply wires 41-1 and 42-1 connected to 41 and 42 are hermetically covered to cover each other in an electrically connected state, thereby completing the handle part 20 having a substantially rod shape.

At this time, hexagonal pressing around both sides of the rod-shaped handle portion 20 is formed to form a hexagonal pressing portion 23 having a bumpy shape.

In this state, the temperature sensing output is tested by using a tester (not shown) on the + and-power supply lines 40 (41, 42) to perform a positive check, and the main body through a known connector (not shown). (Not shown).

Here, the main body includes a power supply for supplying + and − power and a monitor for displaying a temperature detected from a hot runner, and the like, and serves as a controller of a temperature sensor using an ungrounded thermocouple according to the present invention. Will perform.

Although the present invention has been described in detail with reference to preferred embodiments according to the present invention, this is only for illustrating the present invention and is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention. It should be noted that this is possible as well as this is also within the scope of the present invention.

1 is a schematic cross-sectional view of a temperature sensor using an ungrounded thermocouple according to the present invention.

FIG. 2A is an enlarged cross-sectional view of portion “A” of FIG. 1.

FIG. 2B is an enlarged cross-sectional view of the portion “B” of FIG. 1.

3A to 3D are cross-sectional views illustrating a process of manufacturing a temperature sensor using a non-grounded thermocouple according to the present invention after cutting a wire-shaped electrode part drawn in the form of a fine wire in a predetermined length.

* Explanation of symbols for the main parts of the drawings

100: temperature sensor using an ungrounded thermocouple according to the present invention

10: wire-shaped electrode part 11: SUS protective tube

12, 13: two core wires 14: temperature sensing unit as a contact

15: MgO Insulator 16: Seal

20: bar-shaped handle 21: sleeve (sleeve)

22: epoxy support 23: hexagonal pressing portion

30: epoxy 40: power supply line

41, 42: + and-power supply lines 41-1, 42-1: + and-power supply wires

50: fixed housing

Claims (4)

In the temperature sensor using a non-grounded thermocouple, Two core wires made of a wire-shaped SUS sheath, another core formed symmetrically opposite the center of the wire-shaped SUS sheath and formed in the longitudinal direction, and within two sides of the wire-shaped SUS sheath. A temperature sensing unit serving as a contact formed by welding one end of two core wires, and a wire-shaped electrode unit comprising MgO insulators filled at regular intervals based on the two core wires in the wire-shaped SUS protective tube; , Epoxy to seal the finish at the other end of the wire-shaped SUS protection tube, the other end of the two core wires protrude outwardly; + And-power supply lines that are electrically connected to the other ends of the two core wires extending through the epoxy to supply power; A handle portion which allows the user to grip while covering the epoxy and the other ends of the two core wires electrically connected to each other and a portion of the + and − power supply lines to protect the epoxy; The handle portion described above, The other ends of the two core wires protruding from the epoxy closed and sealed at the other end of the wire-shaped sheath and the + and-power supply wires connected to the + and-power supply lines are sealed in an electrically connected state. With a sleeve to cover, Temperature sensor using an ungrounded thermocouple, characterized in that the epoxy support for supporting the epoxy so that the other side of the wire-shaped protective tube and the two core wires do not abut each other on one side of the sleeve. delete The method of claim 1, The other ends of the two core wires which are extended and protruded by the epoxy are electrically connected to the outside of the + and-power supply lines through the bundle of + and-power supply wires, and the + and-power of the bundle A temperature sensor using a non-grounded thermocouple, characterized in that the supply wire and the other ends of the two cores, respectively, are fixedly connected by surface contact by applying a predetermined force in a state in which each of the two cores are rolled and wound around the fixing housing. The method of claim 1, The temperature sensor using the non-grounded thermocouple, characterized in that the inner diameter of the wire-shaped electrode portion is 0.25mm to 0.7mm.

Images