KR102091046B1 - Explosion-proof temperature sensor using bimetal - Google Patents

Abstract

The present invention relates to a temperature sensor for explosion protection using bimetal, which is embodied to be used in an area with a risk of explosion due to presence of flammable gas. The temperature sensor of the present invention includes: a sensing unit which senses whether the temperature of a place where the temperature sensor is installed has reached a set temperature using the bimetal; a cable formed by extending from the sensing unit, and surrounding and protecting two strands of lead wires extending from the sensing unit; and two terminals which are fastened to each end of the two strands of lead wires with a coating peeled off so that the two strands of lead wires can be connected to a measurement unit.

Description

Explosion-proof temperature sensor using bimetal {EXPLOSION-PROOF TEMPERATURE SENSOR USING BIMETAL}

The present invention relates to a temperature sensor for explosion-proof using bimetal, and more particularly, to a temperature sensor for explosion-proof using bimetal implemented so that it can be used even in areas where there is a risk of explosion due to the presence of flammable gas.

The temperature sensor is a sensor that responds to changes in temperature, and is used to automate temperature management by detecting temperature changes. A temperature sensor is a sensor that senses heat and emits an electrical signal, and is generally divided into a contact type and a non-contact type. The contact type is a method of measuring the temperature value by making direct contact with an actual measurement object, and the non-contact type is a method of measuring the heat radiation emitted from an object.

Examples of such a temperature sensor include an RTD sensor, a bimetal temperature sensor, and a thermocouple temperature sensor.

The RTD sensor is a sensor that measures temperature by measuring a voltage applied to a resistance changed according to temperature by applying a constant current to the sensing unit using the principle that the resistance value changes as the temperature changes.

The bimetal temperature sensor is a bimetal that has a property of bending in one direction when it receives heat, and is a temperature sensor that operates to change from a closed circuit to an open circuit or from an open circuit to a closed circuit when a certain temperature is reached.

A thermocouple temperature sensor is a temperature sensor that converts two types of metal into temperature by measuring a minute electromotive force depending on the temperature at the junction.

As described above, the RTD sensor, the bimetal temperature sensor, and the thermocouple temperature sensor apply current to the sensing unit to measure the temperature, and arc or spark may occur due to poor contact, malfunction, etc. in the sensing unit or lead wire, and may cause explosion of flammable gas. It is difficult to use in the realm.

In addition, the conventional temperature fine wire may have a problem that the long cable is stretched due to the shape characteristics and dragged to the floor or twisted with other devices may interfere with accurate sensing of the device, and may take time to clean up. Had

On the other hand, the above-mentioned background technology is the technical information acquired by the inventor for the derivation of the present invention or acquired in the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public before filing the present invention. .

Korean Patent Publication No. 10-2012-0011478 Korean Registered Patent No. 10-1412984

One aspect of the present invention provides a temperature sensor for explosion-proof using bimetal implemented to measure the temperature of a target device using a built-in bimetal sensor, and control other devices using a contact that operates when the set temperature is reached. do.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Explosion-proof temperature sensor using a bimetal according to an embodiment of the present invention, a sensing unit for detecting whether the temperature of the place installed using a bimetal has reached a set temperature; A cable formed by extending from the sensing unit and surrounding and protecting two strands of lead wires extending from the sensing unit; And two terminals that are fastened to each end of the two-stranded lead wires with the coating stripped so that the two-stranded lead wires can be connected to the measurement unit.

In one embodiment, the sensing unit includes a bimetal sensor unit that detects whether the set temperature of the installed location is switched on or off when the temperature of the installed location reaches the set temperature using a bimetal; And a case made of aluminum, in which the bimetal sensor part is seated in an interior space, the interior space is filled with an insulating material, and an opening formed to be inserted into the bimetal sensor part is sealed with a sealant.

In one embodiment, the insulating material may be formed of MgO.

In one embodiment, the case may be formed to be inclined such that the entrance faces the interior space, such as a funnel shape, to prevent the bimetal sensor part inserted into the interior space from being separated.

In one embodiment, the sealant is formed of an epoxy resin, mixed with STYCAST 2651-40FR CAT9 and Catalyst 11 at a volume ratio of 100: 12 at room temperature, and then injected using a syringe at the entrance of the case Potting is performed, and after the potting operation, curing may be performed at 80 ° C. for 8 to 16 hours at room temperature.

In one embodiment, the terminal, the fastening portion with the lead wire may be insulated wrapped by an insulating tube (Insulation Tube) of an elastic material.

In one embodiment, the temperature sensor for explosion-proof using a bimetal according to another embodiment of the present invention, may further include a cable organizer for winding the cable so as to prevent the cable from being stretched.

In one embodiment, the cable arranging unit, both sides are bent in the upper direction to prevent the cable from being pulled out, the upper holder to form an upper winding surface; A lower supporter on which both side surfaces are bent in a downward direction so as to prevent the wound cable from escaping, and spaced apart from a lower side of the upper supporter to form a lower winding surface; And a height adjustment support installed between at least one of the upper holder and the lower holder, and adjusting the distance between the upper holder and the lower holder in multiple stages.

In one embodiment, the height-adjustable support is formed extending from the lower surface of the upper cradle, the upper frame forming an inclined surface so that the lower surface gradually increases from one side to the other; A first support bar extending from a lower surface of the upper frame in a downward direction and extending a first sliding hole in a vertical direction; An upper link on which one side is connected to the first sliding hole to enable rotation and vertical sliding movement; An intermediate surface forming an inclined surface such that the upper surface gradually increases from one side to the other surface corresponding to the lower inclined surface of the upper frame, and gradually decreases from one side to the other side so that the lower surface is symmetric to the upper surface. frame; A second support bar extending from an upper side of the intermediate frame in an upward direction, and a second sliding hole extending in an up-and-down longitudinal direction to be connected to the other side of the upper link to allow rotation and vertical sliding movement; A third support bar extending from a lower surface of the intermediate frame in a downward direction and extending a third sliding hole in a vertical direction; A lower link connected to the other side of the third sliding hole to enable rotation and vertical sliding movement; A lower frame that is formed to be gradually lowered from one side to the other side so that the upper side is symmetrical to the lower side of the upper frame, and extends toward the upper side of the lower cradle; And a fourth support bar extending from an upper surface of the lower frame in an upward direction, and a fourth sliding hole extending in a vertical direction, so that the lower link is connected to one side to enable rotation and vertical sliding movement. can do.

According to one aspect of the present invention described above, there is no arc or spark that can cause ignition, so there is a combustible gas, thereby providing an effect that can be safely used even in an area where there is a risk of explosion.

In addition, it is possible to provide an effect of maintaining the optimal shape for stable sensing by enabling the cable of the sensor to be efficiently wound and used.

The effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within a range obvious to those skilled in the art from the following description.

1 is a view showing a schematic configuration of an explosion-proof temperature sensor using a bimetal according to an embodiment of the present invention.
FIG. 2 is a view showing the sensing unit of FIG. 1.
3 is a view illustrating a manufacturing process of the sensing unit of FIG. 2.
4 is a view showing a schematic configuration of an explosion-proof temperature sensor using a bimetal according to another embodiment of the present invention.
5 is a view showing the cable arrangement of FIG. 4.
6 to 8 are views showing the height adjustment support of FIG. 5.
9 and 10 are views for explaining a method of stretching / shrinking the height adjustment support.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the present invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and properties described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions across various aspects.

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

1 is a view showing a schematic configuration of an explosion-proof temperature sensor using a bimetal according to an embodiment of the present invention.

Referring to FIG. 1, the temperature sensor 10 for explosion-proof using a bimetal according to an embodiment of the present invention includes a sensing unit 100, a cable 200, and two terminals 300.

The sensing unit 100 detects whether the temperature of a place installed using a bimetal has reached the set temperature, and uses a two-wire lead wire 400 to measure the set temperature (for convenience of explanation, in the drawings, (Not shown).

The bimetal used in the sensing unit 100 is a parallel plate at room temperature, but is a metal having a property of bending to one side when heated, and when it reaches a certain temperature using this principle, it is opened in a closed circuit (Normal close). When the temperature is changed to a normal open circuit or vice versa, temperature can be measured using a switching principle that operates from a normal open to a closed circuit.

The cable 200 is formed to extend from the sensing unit 100 and wraps and protects the two strands of the lead wire 400 extending from the sensing unit 100, and provides elastic force so that the lead wire 400 is not bent over a certain angle. Use to protect.

The terminal 300 is fastened to each end of the lead wire 400 of the two strands with the coating stripped so that the lead wire 400 of the two strands can be connected to the measurement unit (not shown in the drawing for convenience of description).

In one embodiment, the terminal 300, the fastening portion with the lead wire 400 may be insulated by being wrapped by an insulating tube 310 made of an elastic material.

In one embodiment, the part where the lead wire 400 is separated from the cable 200 may be insulated by being wrapped with a heat-shrinkable tube 600, and insulation may be performed by attaching an insulating tape.

The temperature sensor 10 for explosion-proof using bimetal according to the above-described configuration can be safely used even in an area where there is a risk of explosion due to the presence of flammable gas because no arc or spark can occur.

The temperature sensor 10 for explosion-proof using bimetal according to the above-described configuration may be installed in an explosion-proof area, but a place using a contact point operated when reaching a set temperature is connected with a cable and other installed in a safe area. It can be used in connection with devices, and if it is used in connection with other devices installed in an explosion-proof area, it can be used by connecting to a device installed in an enclosure that has obtained a separate explosion-proof certification or a device that has obtained a separate explosion-proof certification. In any case, the present invention has the advantage that it can be installed in hazardous areas.

In addition, the present invention belongs to Group II targeting gas and steam of general business sites and chemical plants as an explosion-proof structure, and can be used in Zone 1 (one dangerous place).

FIG. 2 is a view showing the sensing unit of FIG. 1.

Referring to FIG. 2, the sensing unit 100 includes a bimetal sensor unit 110 and a case 120.

The bimetal sensor unit 110 detects whether the set temperature of the installed place is switched on or off when the temperature of the installed place reaches the set temperature by using the bimetal, and transmits it to the measurement unit through the lead wire 400 do.

The bimetal sensor unit 110 according to the present invention is an IT-d-THPBI model incorporating a bimetal sensor and measures a temperature of a target device to control a temperature sensor to control other devices using a contact that operates when a set temperature is reached. to be.

The case 120 is made of aluminum, and the bimetal sensor unit 110 is seated in the inner space, and as shown in FIG. 3 (b), the bimetal sensor unit 110 is seated and the remaining inner space is an insulating material. Filled with 121, the inlet 123 formed to insert the bimetal sensor unit 110 is sealed with a sealant 122.

At this time, the insulating material 121 is preferably formed of MgO.

In one embodiment, the case 120, the inlet 123, as shown in Figure 3 (a) to prevent the bimetal sensor unit 110 inserted in the interior space is separated, as shown in the funnel shape It may be formed to be inclined toward the interior space.

 In one embodiment, the sealant 122 is formed of an epoxy resin, and after mixing STYCAST 2651-40FR CAT9 and Catalyst 11 in a volume ratio of 100: 12 at room temperature, the inlet 123 of the case 120 The part (Fig. 3 (c)) is injected using a syringe and potted, and when the potting operation is completed, it can be produced by curing at 80 ° C. for 8 to 16 hours at room temperature.

4 is a view showing a schematic configuration of an explosion-proof temperature sensor using a bimetal according to another embodiment of the present invention.

Referring to FIG. 4, the temperature sensor 20 for explosion-proof using a bimetal according to another embodiment of the present invention includes a sensing unit 100, a cable 200, two terminals 300 and a rearranging unit 500 do. Here, since the sensing unit 100, the cable 200, and the two terminals 300 are the same as the components of FIG. 1, description thereof will be omitted.

The cable arrangement unit 500 may wind up the cable 200 so as to prevent the cable 200 from being stretched.

The temperature sensor 20 for explosion-proof using a bimetal according to another embodiment having the above-described configuration can be used to efficiently wind the sensor cable to maintain an optimal shape for stable sensing.

5 is a view showing the cable arrangement of FIG. 4.

Referring to FIG. 5, the cable arrangement unit 500 includes an upper mount 510, a lower mount 520 and a height adjustment support 700.

In the upper holder 510, both sides are bent in an upward direction so as to prevent the wound cable 200 from escaping, and form an upper winding surface of the cable arrangement part 500.

In the lower holder 520, both sides are formed in a downward direction to prevent the wound cable 200 from escaping, and are spaced apart from the lower side of the upper holder 510 to form a lower winding surface of the cable organizer 500. do.

The height-adjustable support 700 is installed between at least one of the upper cradle 510 and the lower cradle 520, and the distance between the upper cradle 510 and the lower cradle 520 is shown below in FIG. Adjust in multiple steps.

The cable arranging unit 500 having the above-described configuration is a configuration corresponding to the reel for winding the cable 200, and adjusting the height for winding up in multiple steps corresponding to the length of the cable 200. As a configuration of can provide the advantage that can be wound up various types of cables efficiently.

6 is a view showing the height-adjustable support of FIG. 5.

Referring to Figure 6, the height adjustment support 700, the upper frame 710, the first support bar 720, the upper link 730, the intermediate frame 740, the second support bar 750, the third It includes a support bar 760, a lower link 770, a lower frame 780 and a fourth support bar 790.

The upper frame 710 is formed to extend from the lower side of the upper cradle 510, and forms an inclined surface 712 such that the lower side gradually increases from one side to the other as shown in FIG. , The first support bar 720 is extended from the inclined surface 712.

At this time, the upper frame 710 to form the inclined surface 712 is to ensure that the upper link 730 is supported by the inclined surface 712 to maintain a constant angle, as shown in FIG. Each of the inclined surfaces formed in the intermediate frame 740 and the lower frame 780 is also to play the same role.

In one embodiment, the upper frame 710 is, as shown in Figure 7, one side of the upper link 730 is inserted into the lower inclined surface 712 so that the upper link 730 in the form corresponding to the agent 1 An insertion hole 711 may be formed.

The first support bar 720 is formed to extend downward from the lower surface of the upper frame 710, and the upper link 730 is a bolt (B) and a nut (N) to allow sliding movement in the rotation and elevation directions. The first sliding hole 721 is extended in the vertical direction so that it can be connected and installed by a fastening means such as.

In one embodiment, the first support bar 720 may be provided with an elastic body 722 on the lower side so as to absorb shock using an elastic force when the upper side of the fourth support bar 790 is in close contact.

The upper link 730 is connected to one side to allow the first sliding hole 721 to rotate and slide up and down, and the other side is rotated to the second sliding hole 751 of the second support bar 750 and It is connected to enable vertical sliding movement.

At this time, the upper link 730 is supported on each inclined surface of the upper frame 710 or the intermediate frame 740 to form an inclined angle as shown in FIG. 6, or is connected or installed, or illustrated in FIG. 9 (c). As it is fastened to each insertion hole of the upper frame 710 or the intermediate frame 740, the upper frame 710 and the intermediate frame 740 may be connected and installed in the vertical direction.

Hereinafter, the lower link 770, which will be described later, also performs the same function as the upper link 730, so the description will be omitted to avoid duplication of the description.

The intermediate frame 740 forms an inclined surface 743 such that the upper surface gradually increases from one side to the other surface corresponding to the lower inclined surface 712 of the upper frame 710, and the lower surface is symmetric with the upper surface. The inclined surface 744 is formed to gradually decrease from one side to the other.

In one embodiment, the intermediate frame 740 forms a second insertion hole 741 in the upper inclined surface 743 so that the other side of the upper link 730 can be inserted and fastened, and the lower link 770 A third insertion hole 742 may be formed in the lower inclined surface 744 so that the other side can be inserted and fastened.

The second support bar 750 is formed to extend upward from the upper surface of the intermediate frame 740, and the second sliding hole 751 extends in the vertical direction, and the other side of the upper link 730 rotates. And it is installed to be connected to the vertical sliding movement.

The third support bar 760 is formed to extend downward from the lower surface of the intermediate frame 740, and the third sliding hole 761 extends in the vertical direction.

The lower link 770 is connected to one side to enable rotation and vertical sliding movement to the fourth sliding hole, and the other side is installed to enable rotation and vertical sliding movement to the third sliding hole 761.

Here, the fourth sliding hole, which corresponds to the first sliding hole 721 and the symmetrical structure, is not shown in the drawings for the sake of redundancy.

The lower frame 780 forms an inclined surface 781 to gradually decrease from one side to the other so that the upper side is symmetrical to the lower side of the upper frame 710, and extends to the upper surface of the lower cradle 520. do.

In one embodiment, the lower frame 780 may form a fourth insertion hole (not shown in the drawings for convenience of description) on the upper inclined surface 781 so that one side of the lower link 770 can be inserted and fastened. have.

The fourth support bar 790 is formed to extend upward from the upper surface of the lower frame 780, and a fourth sliding hole is formed to extend in the vertical direction, so that one side of the lower link 770 rotates and moves vertically. It is installed to enable connection.

Height adjustment support 700 having the configuration as described above, when the upper link 730 and the lower link 770 are both folded as shown in Figure 9 (Fig. 9 (a), 700a of Fig. 10) ) When the overall height is formed lowest, and only the upper link 730 is unfolded (FIG. 9 (b)), the overall height is formed as an intermediate height, and both the upper link 730 and the lower link 770 are unfolded ( 9 (c) and 700b of FIG. 10), the overall height is formed to be the highest, so that the user can adjust the height of the support 700 according to the interval between the upper cradle 510 and the lower cradle 520 that the user needs. It can be used by folding or unfolding the configuration.

The above-described embodiments are for illustration only, and those skilled in the art to which the above-described embodiments belong can easily be modified into other specific forms without changing the technical idea or essential characteristics of the above-described embodiments. You will understand. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope to be protected through the present specification is indicated by the claims, which will be described later, rather than the detailed description, and should be interpreted to include all the changed or modified forms derived from the meaning and scope of the claims and their equivalent concepts. .

10: Explosion-proof temperature sensor using bimetal
100: sensing unit
200: cable
300: terminal
400: lead wire
500: cable arrangement
600: heat shrink tube
700: height adjustment support

Claims (2)

A sensing unit that detects whether the temperature of the installed place has reached the set temperature using bimetal;
A cable formed by extending from the sensing unit and surrounding and protecting two strands of lead wires extending from the sensing unit; And
Includes; two terminals fastened to each end of the two strands of the lead wire is stripped so that the lead wires of the two strands can be connected to the measuring unit;
The sensing unit includes a bimetal sensor unit that detects whether the set temperature of the installed location is switched on or off when the temperature of the installed location reaches the set temperature by using bimetal; And a case made of aluminum, in which the bimetal sensor part is seated in an interior space, the interior space is filled with an insulating material, and an opening formed to be inserted into the bimetal sensor part is sealed with a sealant.
The insulating material is formed of MgO,
The case is formed to be inclined so that the entrance faces the interior space like a funnel shape so as to prevent the bimetal sensor part inserted in the interior space from being separated,
The sealant is formed of an epoxy resin, mixed with STYCAST 2651-40FR CAT9 and Catalyst 11 at a volume ratio of 100: 12 at room temperature, and then injected using a syringe at the entrance of the case to be potted. , After potting, it is produced by curing at 80 ° C for 8 to 16 hours at room temperature.
In the terminal, the fastening part with the lead wire is insulated by being wrapped by an insulating tube made of elastic material,
It further includes a cable organizer for winding the cable so as to prevent the cable from sagging;
The cable arranging portion, the upper holder is formed on both sides bent in an upward direction to prevent the wound cable from coming off, and forms an upper winding surface; A lower supporter on which both side surfaces are bent in a downward direction so as to prevent the wound cable from escaping, and spaced apart from a lower side of the upper supporter to form a lower winding surface; And a height adjustment support which is installed between the upper mount and the lower mount, and adjusts the distance between the upper mount and the lower mount in multiple stages.
The height adjustment support, the upper frame is formed extending from the lower surface of the upper cradle, forming a sloped surface so that the lower side gradually increases from one side to the other; A first support bar extending from a lower surface of the upper frame in a downward direction and extending a first sliding hole in a vertical direction; An upper link on which one side is connected to the first sliding hole to enable rotation and vertical sliding movement; An intermediate surface forming an inclined surface such that the upper surface gradually increases from one side to the other surface corresponding to the lower inclined surface of the upper frame, and gradually decreases from one side to the other side so that the lower surface is symmetric to the upper surface. frame; A second support bar extending from an upper side of the intermediate frame in an upward direction, and a second sliding hole extending in an up and down length direction so that the other side of the upper link is connected and installed to enable rotation and vertical sliding movement; A third support bar extending from a lower surface of the intermediate frame in a downward direction and extending a third sliding hole in a vertical direction; A lower link connected to the other side of the third sliding hole to allow rotation and vertical sliding movement; A lower frame formed to be inclined so as to gradually lower from one side to the other so that the upper side is symmetric with the lower side of the upper frame, and extends toward the upper side of the lower cradle; And a fourth support bar extending from an upper surface of the lower frame in an upward direction, and a fourth sliding hole extending in a vertical direction, so that the lower link is connected to one side to enable rotation and vertical sliding movement. Explosion-proof temperature sensor using bimetal. delete

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