Resistance temperature detectors

Abstract

The present invention relates to resistance temperature detectors (RTDs), and more specifically, to resistance temperature detectors (RTDs) that minimize damage caused by thermal stress. The objective of the present invention is to solve the problem of wire breakage caused by thermal stress and to minimize damage caused by ferrules to the area where ferrules are mounted. According to one aspect of the present invention, a temperature sensor is disclosed that is connected to a resistance measuring device and transmits resistance information that changes according to a temperature change, comprising: a metal conduit; a temperature sensing element including a first lead wire and a second lead wire inserted into the metal conduit and each connected to a plurality of output terminals; and a first wire and a second wire, one end of which is connected to the resistance measuring device and the other end of which is connected to the temperature sensing element, so that the resistance measuring device supplies current to the temperature sensing element, wherein the first wire and the second wire are connected to the first lead wire and the second lead wire, respectively, in a twisted state. According to the present invention, even if tensile or compressive force is applied to the wire due to the occurrence of thermal stress, wire breakage may not occur.

Description

Technology Field

[0001] The present invention relates to resistance temperature detectors (RTDs), and more specifically, to resistance temperature detectors (RTDs) that minimize damage caused by thermal stress. Background Technology

[0002] Temperature sensors are designed to measure temperature by detecting changes in internal resistance, voltage, or current caused by temperature variations. Examples include thermistors, which utilize the negative property where internal resistance decreases with temperature; platinum temperature sensors, which utilize the increase in the proportional resistance of a platinum element with temperature; and thermocouple temperature sensors, which utilize the principle that an electromotive force is generated when heat is applied to different objects.

[0003] Among them, platinum temperature sensors using platinum elements are used for detecting and controlling high temperatures in industrial applications such as electric furnaces, smelting, and blast furnaces, in addition to measuring engine temperature, transformer insulating oil temperature, gearbox temperature, gas temperature, and operating environment temperature of equipment.

[0004] Generally, as shown in FIG. 1 of Korean Patent Publication No. 2009-0033131, a platinum temperature sensor forms a meander-shaped platinum resistive film pattern (3) having platinum contact pads (4) on a sapphire substrate (1), and forms a protective layer (7) with aluminum oxide (Al2O3) to protect the platinum resistive film pattern (3). The protective layer (7) forms a passivation layer (10) made of glass ceramic over that portion. Terminals (5) are in contact with both ends of the platinum contact pattern (4), lead wires (6a, 6b) are connected to the terminals (5), and a protective layer (9) is formed to reduce stress on the lead wires (6a, 6b).

[0005] However, conventional platinum temperature sensors have a problem in that cracks may occur due to thermal shock when the lead wires (6a, 6b) and terminals (5) are bonded, causing the lead wires (6a, 6b) to detach from or break off from the electrodes, and when used for a long time in a high temperature and vibration environment of 700°C or higher, the protective layer (9) formed at the joint between the lead wires (6a, 6b) and terminals (5) may detach due to vibration or shock.

[0006] In addition, a wire for measuring resistance according to temperature by passing current through a platinum temperature sensor is connected to the lead wires (6a, 6b), and generally, the lead wires (6a, 6b) and the wire are connected through soldering. However, there is a problem that the lead wires (6a, 6b) and the wire may also break due to thermal stress.

[0007] In addition, when the flow rate is high in the temperature sensor panel area, there is a problem where the piping is deformed or broken due to external forces, causing sensor malfunction. The problem to be solved

[0008] The present invention aims to solve the aforementioned problems. The objective of the present invention is to resolve the issue of wire breakage caused by thermal stress and to minimize damage to the ferrule area caused by forces acting on it through a design (double piping and epoxy treatment) that provides a strength structure greater than the force applied to the ferrule when the flow rate is high. means of solving the problem

[0010] According to one aspect of the present invention, a temperature sensor is disclosed that is connected to a resistance measuring device and transmits resistance information that changes according to a temperature change, the temperature sensor comprising a metal conduit, a first lead wire and a second lead wire inserted into the metal conduit and each connected to a plurality of output terminals, and a first wire and a second wire, one end of which is connected to the resistance measuring device and the other end of which is connected to the temperature sensor, so as to supply current to the resistance measuring device to the temperature sensor, wherein the first wire and the second wire are each connected to the first lead wire and the second lead wire in a twisted state.

[0011] According to an embodiment, a temperature sensor is disclosed that further includes a third wire connected to the first lead wire, wherein the third wire is connected to the first lead wire in a state where it is mutually twisted and bent with the first wire.

[0012] According to an embodiment, a temperature sensor is disclosed that further includes a fourth wire connected to the second lead wire, wherein the fourth wire is connected to the second lead wire in a state in which it is mutually twisted and bent with the second wire.

[0013] According to an embodiment, a temperature sensor is disclosed that further comprises epoxy filled between the inner wall of the metal conduit and the temperature sensing element.

[0014] According to an embodiment, a temperature sensor is disclosed, further comprising a concentric pipe inserted into the interior of the metal conduit and a ferrule mounted on the outer surface of the metal conduit, wherein the concentric pipe is characterized by having epoxy coated on its interior.

[0015] According to an embodiment, a temperature sensor is disclosed in which the ferrule is mounted at a position where the concentric pipe is inserted to form a double pipe.

[0016] According to an embodiment, a temperature sensor is disclosed in which the epoxy is applied to a location where the ferrule is mounted.

[0017] According to an embodiment, a temperature sensor is disclosed in which the metal conduit includes an insulator inside, wherein the insulator is magnesium oxide (MgO). Effects of the invention

[0018] According to the present invention, even if tensile or compressive force is applied to the wire due to thermal stress, a break in the wire may not occur.

[0019] In addition, according to the present invention, damage caused by the ferrule can be minimized.

[0020] In addition, according to the present invention, by additionally inserting only concentric pipes, an effect similar to increasing the thickness of the conduit can be obtained.

[0021] In addition, according to the present invention, by applying epoxy, the area around the ferrule mounting site can have higher robustness.

[0022] In addition, according to the present invention, it can have a significantly high response speed and accuracy. Brief explanation of the drawing

[0023] Figure 1 is an exploded perspective view of a conventional resistance measuring temperature sensor. FIG. 2 is a plan view showing a resistance measuring temperature sensor according to an embodiment of the present invention. FIG. 3 is a plan view showing a 4-wire type resistance measuring temperature sensor according to an embodiment of the present invention. FIG. 4 is a photograph showing a three-wire type resistance measuring temperature sensor according to an embodiment of the present invention. Specific details for implementing the invention

[0024] The objects, features, and advantages of the present invention described above will become more apparent through the following embodiments in connection with the accompanying drawings. The specific structural or functional descriptions below are merely illustrative for the purpose of explaining other embodiments of the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application. Since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Terms such as "first" and / or "second" may be used to describe various components, but said components are not limited to said terms. The above terms may be used solely for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, such that the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that a component is connected to or coupled with another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. On the other hand, when it is stated that a component is directly connected to or directly coupled with another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as between, immediately between, adjacent to, and directly adjacent to, should be interpreted in the same way.The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "include" or "have" in this specification are intended to indicate the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification. The invention will be described in detail below by describing preferred embodiments of the invention with reference to the accompanying drawings. Identical reference numerals in each drawing indicate identical components.

[0025] FIG. 2 is a plan view showing a resistance measuring temperature sensor according to an embodiment of the present invention.

[0026] Referring to FIG. 2, a resistance measuring temperature sensor according to one embodiment of the present invention may include a metal conduit (100), a temperature measuring element (200), a first wire (310) and a second wire (320), a concentric pipe (400), a ferrule (500), and an epoxy (50). The temperature measuring element (200) may include a first lead wire (210) and a second lead wire (220) and may be connected to a resistance measuring device (1000) through the first wire (310) and the second wire (320), respectively, to receive current.

[0027] The temperature measuring element (200) is a metal element such as platinum, nickel, or copper, and can measure temperature by utilizing the principle that the electrical resistance of a conductor or semiconductor changes with temperature. The temperature measuring element (200) can be connected to the first wire (310) and the second wire (320) respectively through the first lead wire (210) and the second lead wire (220), which are respectively connected to a plurality of output terminals to be inserted into the metal conduit (100) and to receive current. At this time, the first wire (310) and the second wire (320) can be connected to the first lead wire (210) and the second lead wire (220) respectively in a twisted state.

[0028] One side of the first wire (310) and the second wire (320) may be connected to the resistance measuring device (1000) and the other side to the temperature sensing element (200) so that current supplied from the resistance measuring device (1000) is supplied to the temperature sensing element (200). The first wire (310) and the second wire (320) may be connected to the first lead wire (210) and the second lead wire (220) of the temperature sensing element (200) in a twisted state (A), respectively. By connecting the first wire (310) and the second wire (320) to the first lead wire (210) and the second lead wire (220) in a twisted state (A), thermal stress may occur, and even if tensile or compressive force is applied to the first wire (310) and the second wire (320), a break in the wire may not occur.

[0029] The epoxy (50) can be filled into the empty space between the inner wall of the metal conduit (100) and the temperature sensing element (200) to increase the temperature measurement responsiveness and accuracy.

[0030] The concentric pipe (400) is a pipe with a smaller diameter than the metal conduit (100) and can be inserted into the metal conduit (100). A ferrule (500) can be mounted on the outer surface of the metal conduit (100) into which the concentric pipe (400) is inserted. As the ferrule (500) is mounted, the concentric pipe (400) can increase its resistance to pressure applied to the metal conduit (100). Additionally, epoxy (50) can be applied to the inside of the concentric pipe (400) to provide higher rigidity.

[0031] The ferrule (500) is mounted on the outer surface of the metal conduit (100), and can be mounted at a location where a concentric pipe (400) is inserted to form a double pipe. Additionally, the epoxy (50) filled inside the concentric pipe (400) can be applied at the location where the ferrule (500) is mounted to improve rigidity.

[0032] FIG. 3 is a plan view showing a 4-wire type resistance measuring temperature sensor according to an embodiment of the present invention.

[0033] Referring to FIG. 3, a resistance measuring temperature sensor according to one embodiment of the present invention may include a metal conduit (100), a temperature measuring element (200), a first wire (310) and a second wire (320), a third wire (330) and a fourth wire (340), a concentric pipe (400), a ferrule (500), and an epoxy (50). The temperature measuring element (200) may include a first lead wire (210) and a second lead wire (220) and may be connected to a resistance measuring device (1000) through the first wire (310), the third wire (330), the second wire (320), and the fourth wire (340), respectively, to receive current.

[0034] The temperature measuring element (200) is a metal element such as platinum, nickel, or copper, and can measure temperature by utilizing the principle that the electrical resistance of a conductor or semiconductor changes with temperature. The temperature measuring element (200) can be connected to the first wire (310), the third wire (330), the second wire (320), and the fourth wire (340) respectively through the first lead wire (210) and the second lead wire (220), which are respectively connected to a plurality of output terminals to receive current and are inserted into the metal conduit (100).

[0035] One side of the first wire (310), the second wire (320), the third wire (330), and the fourth wire (340) may be connected to the resistance measuring device (1000) and the other side may be connected to the temperature sensing element (200) so that the current supplied from the resistance measuring device (1000) is supplied to the temperature sensing element (200). The first wire (310) and the third wire (330) may be connected to the first lead wire (210) in a state where they are twisted and bent together (A'). Here, the first wire (310) and the third wire (330) are connected to the first lead wire (210) by twisting and bending the stripped copper wire portions together, and when connected to the first lead wire (210), they may be connected by a method such as soldering. Additionally, the second wire (320) and the fourth wire (340) can be connected to the second lead wire (220) in a twisted and bent state (A'). Here, the second wire (320) and the fourth wire (340) are connected to the second lead wire (220) by twisting and bending the stripped copper wire portions together, and when connected to the second lead wire (220), they can be connected by methods such as soldering. Since the first wire (310) and the third wire (330), the second wire (320) and the fourth wire (340) are each connected to the first lead wire (210) and the second lead wire (220) in a twisted and bent state (A'), thermal stress is generated, so even if tensile or compressive force is applied to the first wire (310), the second wire (320), the third wire (330), and the fourth wire (340), a break in the wire may not occur.

[0036] The epoxy (50) can be filled into the empty space between the inner wall of the metal conduit (100) and the temperature sensing element (200) to increase the temperature measurement responsiveness and accuracy.

[0037] The concentric pipe (400) is a pipe with a smaller diameter than the metal conduit (100) and can be inserted into the metal conduit (100). A ferrule (500) can be mounted on the outer surface of the metal conduit (100) into which the concentric pipe (400) is inserted. As the ferrule (500) is mounted, the concentric pipe (400) can increase its resistance to pressure applied to the metal conduit (100). Additionally, epoxy (50) can be applied to the inside of the concentric pipe (400) to provide higher rigidity.

[0038] The ferrule (500) is mounted on the outer surface of the metal conduit (100), and can be mounted at a location where a concentric pipe (400) is inserted to form a double pipe. Additionally, the epoxy (50) filled inside the concentric pipe (400) can be applied at the location where the ferrule (500) is mounted to improve rigidity.

[0039] FIG. 4 is a photograph showing a three-wire type resistance measuring temperature sensor according to an embodiment of the present invention.

[0040] Referring to FIG. 4, in a three-wire type resistance measuring temperature sensor, one wire may be connected to the first lead wire (210) (or the second lead wire (220)) of the temperature measuring element (200), and two wires may be connected to the second lead wire (220) (or the first lead wire (210)). For convenience of explanation, it is described that the first wire (310) is connected to the first lead wire (210), and the second wire (320) and the fourth wire (340) are connected to the second lead wire (220).

[0041] First, the first wire (310) can be connected to the first lead wire (210) of the temperature measuring element (200) in a twisted state (A).

[0042] Additionally, the second lead wire (220) of the temperature measuring element (200) may be connected to the second wire (320) and the fourth wire (340) in a twisted and bent state (A').

[0043] At this time, since the first wire (310) connected to the first lead wire (210) is connected as a single wire, the copper wire can be directly twisted and connected to the first lead wire (210) to prevent breakage due to thermal stress. The second wire (320) and the fourth wire (340) connected to the second lead wire (220) can be connected to the second lead wire (220) by means such as soldering while the copper wires are twisted and bent together to prevent breakage due to thermal stress.

[0044] Although preferred embodiments of the present invention have been described above, the embodiments disclosed in the present invention are intended only to illustrate, not to limit, the technical scope of the present invention. Accordingly, the technical scope of the present invention includes not only each disclosed embodiment but also combinations of the disclosed embodiments, and furthermore, the scope of the technical scope of the present invention is not limited by such embodiments. In addition, a person skilled in the art to which the present invention pertains can make numerous changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications should be deemed to fall within the scope of the present invention as equivalents. Explanation of the symbols

[0045] 50: Epoxy 100 : Metal conduit 200 : Temperature measuring element 210: 1st lead wire 220 : 2nd lead wire 310: 1st Front 320: Second Front 330: 3rd Front 340: 4th Front 400 : Concentric piping 500 : Parallel 1000 : Resistance measuring device

Claims

Claim 1 A temperature sensor connected to a resistance measuring device and transmitting resistance information changed according to a temperature change, comprising: a metal conduit; a temperature sensing element including a first lead wire and a second lead wire inserted into the metal conduit and forming a plurality of output terminals; epoxy filled between the inner wall of the metal conduit and the temperature sensing element; a concentric pipe inserted into the interior of the metal conduit; a ferrule mounted on the outer surface of the metal conduit; a first wire and a second wire, one end of which is connected to the resistance measuring device and the other end of which is respectively connected to the first lead wire and the second lead wire, so that the resistance measuring device supplies current to the temperature sensing element; and a third wire, one end of which is connected to the resistance measuring device and the other end of which is connected to the first lead wire, so that the resistance measuring device supplies current to the temperature sensing element. A temperature sensor comprising: a fourth wire, one end of which is connected to the resistance measuring device and the other end of which is connected to the second lead wire, so as to supply current to the resistance measuring device to the temperature sensing element; wherein the other end of the third wire is connected to the first lead wire in a state of being intertwined and bent with the first wire, and the other end of the fourth wire is connected to the second lead wire in a state of being intertwined and bent with the second wire, and the ferrule is mounted at a position where the concentric pipe is inserted to form a double pipe, and the epoxy is additionally applied at the position where the ferrule is mounted, and the metal conduit includes an insulator inside, wherein the insulator is magnesium oxide (MgO). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete

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