JP2011216221A - Temperature sensitive switch for sensing abnormal high temperature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein, although there are various types of temperature sensors for sensing an abnormal high temperature of various facilities and equipment irreversibly, a temperature sensor, which accurately operates, exhibits high durability and reliability, and is manufactured inexpensively, is difficult to find.SOLUTION: A liquid absorbing layer 4 formed of a liquid absorbent substance is arranged in a periphery of a center of a substrate 1 formed of insulating material so that an upper surface of the liquid absorbing layer is flush with an upper surface of the substrate 1. A pair of band-like electrode plates 6, 6 are oppositely arranged to be in contact with a pair of side edges 5 of the liquid absorbing layer 4. A hollow housing 7 is covered on an upper surface center of the substrate 1 to cover the electrode plates 6, 6. An insulating wax layer 8, which is formed of petroleum-based wax, has an insulation property and is dissolved at an optional set temperature, is formed on the upper surface of the substrate 1 in the hollow housing 7. Furthermore, a conductive wax layer 9, which is formed by kneading a conductive substance in a petroleum-based wax dissolved at a same temperature as the insulating wax layer 8, is superposed on an upper surface of the insulating wax layer 8 to structure the temperature sensitive switch for sensing an abnormal high temperature.

Description

  The present invention relates to a temperature sensitive switch for detecting abnormally high temperatures, and more particularly to a switch that irreversibly closes an electric circuit in response to an abnormally high temperature at an installation location.

  Temperature sensitive switches that open and close electrical circuits in response to the temperature of the installation location are widely used in all industrial fields, and one of the applications of this temperature sensitive switch is to detect abnormally high temperatures at installation locations. It is done.

JP2009-152219A JP2007-280871

None

  The temperature-sensitive switch used for irreversibly sensing abnormally high temperatures needs to be accurate at a preset temperature, with a low unit price per unit, and with high durability and reliability. However, conventional temperature sensitive switches have a complicated structure, are likely to fail, lack reliability and durability, and have a high manufacturing cost.

  The present invention solves the above-mentioned conventional problems related to a temperature sensitive switch that senses an abnormally high temperature, and can detect an exothermic phenomenon accurately and reliably and display it irreversibly. Is intended to provide.

  According to the first aspect of the present invention, the liquid absorbing layer 4 made of a liquid absorbing material is disposed near the center of the substrate 1 made of an insulating material so that the upper surface thereof is flush with the upper surface of the substrate 1. A pair of electrode plates 6 and 6 in the form of strips are positioned in an opposed state so as to be in contact with the pair of side edges 5 of the liquid absorption layer 4, and the substrate 1 is covered so as to cover these electrode plates 6 and 6. A hollow housing 7 is placed at the center of the upper surface, and an insulating wax layer 8 made of petroleum wax having an insulating property and melting at an arbitrary set temperature is formed on the upper surface of the substrate 1 in the hollow housing 7. On the upper surface of the conductive wax layer 8, a conductive wax layer 9 obtained by kneading a conductive substance in petroleum wax that melts at the same temperature as the insulating wax layer 8 is superimposed to constitute a temperature sensitive switch for detecting abnormally high temperatures. Thus, the above-mentioned problem has been solved.

  In the invention according to claim 2, a pair of rod-like electrode plates 14 and 14 are arranged in series on the substrate 1 made of an insulating material at intervals, and the electrode plates 14 and 14 are arranged between the electrode plates 14 and 14. The tongue 15 has a length sufficient for the start end 15 side to be fixed to the opposite end of the one electrode plate 14 and the open end 16 overlapping the other electrode plate 14 and biased downward. The conductive plate spring 18 is provided, the contact 19 is provided on the lower surface on the open end 16 side of the plate spring 18, and the contact 20 is provided on the upper surface of the electrode plate 14 at a position corresponding to the contact 19, respectively. A liquid absorber 22 having a plate shape is extended to the opposite end portion 21, and a solid petroleum wax 23 that melts at a desired set temperature is interposed between the pair of contacts 19 and 20. A temperature sensitive switch for detecting abnormally high temperatures is formed by forcibly separating the contacts 19 and 20 from each other. By, the above-mentioned problems are eliminated.

  Furthermore, in the invention according to claim 3, in the casing 24 made of a conductive material having a cylindrical shape in which both end portions 25 and 26 are closed and the lead wire 41 is connected to the outer surface, the one end portion 25 is closer to one end. It is displaced and filled with a petroleum wax 27 whose end 28 on the open end side is sealed by a disk-shaped rubber plate 29, and penetrates the other end 26 along the axis of the casing 24. The conductive rod-like body 32 accommodated in the insulating sheath tube 31 is inserted, a contact 34 is provided at the tip of the rod-like body 32, and the contact 34 and the portion near the end portion 26 of the casing 24 are provided. Between the contact point 34 and the rubber plate 29, and a spring member 36 is stretched between the contact point 34 and the rubber plate 29. 37 is slidably positioned, and the conductive cylinder 37 A disc-shaped sealing material 38 is bonded to the end surface near the rubber plate 29, a spring material 39 is stretched between the opposite end surface and the end surface of the casing 24, and the conductive cylinder 37 is attached to the rubber plate 29 side. The above-mentioned problem has been solved by constructing a temperature sensitive switch for detecting abnormally high temperatures.

  Because it uses the heat-dissolving or expanding action of petroleum-based wax, it responds accurately to temperature, operates reliably and is highly durable, has almost no risk of malfunction, and has a simple structure and parts The number is low and can be manufactured at low cost. Furthermore, once the set temperature is exceeded, the circuit will continue to be closed even if the temperature subsequently drops. It has excellent effects such as being particularly effective for sensing abnormally high temperatures.

The top view of Example 1 of the temperature sensor for abnormal high temperature detection concerning this invention. Similarly, arrow AA sectional view taken on the line in FIG. Similarly, sectional drawing of the state which electrically connected between the electrode plates 6 and 6 by over preset temperature. Similarly, the perspective view of the state attached to the target object which should be temperature-sensitive. Similarly, explanatory drawing of the state connected with the power supply and the light bulb. The longitudinal cross-sectional view of Example 2 of the temperature sensitive switch for abnormally high temperature detection based on this invention. Similarly, sectional drawing of the state which electrically connected between electrode plates 14 and 14 by over preset temperature. The longitudinal cross-sectional view of Example 3 of the temperature switch for abnormally high temperature detection based on this invention. Similarly, the longitudinal cross-sectional view of the state in which the circuit is closed due to the set temperature exceeding. Similarly, the longitudinal cross-sectional view of a state in which the temperature is lowered again after the set temperature is exceeded.

  The greatest feature lies in that the circuit is irreversibly closed when the set temperature is exceeded by utilizing the dissolving or expanding action of petroleum wax by heat.

  FIG. 1 is a plan view of a first embodiment of a temperature sensitive switch for detecting abnormally high temperatures according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. In the figure, reference numeral 1 denotes a substrate made of an electrically insulating material, and a pressure-sensitive adhesive layer 2 is formed on the back surface, so that it can be attached to the surface of an object 11 that is intended to detect abnormally high temperatures. In the vicinity of the center of the substrate 1, a rectangular cutout is provided. The cutout has a blotting paper or the like such that its upper surface is flush with the upper surface of the substrate 1. The liquid absorption layer 4 is filled with the liquid absorption material.

  Furthermore, on the upper surface side of the substrate 1, a pair of electrode plates 6, 6 having a band shape are positioned in an opposed state so as to be in contact with the pair of side edges 5, 5 of the liquid absorption layer 4. A film-shaped hollow housing 7 is covered at the center of the upper surface of the substrate 1 so as to cover the electrode plates 6 and 6, and an arbitrary preset value is set on the upper surface of the substrate 1 in the hollow housing 7. An insulating wax layer 8 made of a petroleum wax that melts at a temperature is formed. On the upper surface of the insulating wax layer 8, a petroleum wax that dissolves at the same temperature as the insulating wax layer 8, copper, A conductive wax layer 9 in which a conductive material such as fine particles of conductive metal such as aluminum or nickel, or fine particles of carbon is kneaded is superimposed.

  A lead piece 10 for connecting to an external electric circuit extends outward from the electrode plate 6.

  This Example 1 has the structure as described above. As shown in FIG. 4, the adhesive layer 2 is attached to the surface of the object 11 to be sensed for abnormal temperature, as shown in FIG. As shown in FIG. 2, an electrical display element such as a power source 12 and a light bulb 13 is connected between the lead pieces 10 and 10 for use, and when the object 11 reaches a preset temperature, the hollow housing 7 is dissolved and absorbed by the liquid absorption layer 4, and the conductive wax layer 9 is also dissolved and directly touches the electrode plate 6 as shown in FIG. Accordingly, the pair of electrode plates 6 and 6 are made conductive by the conductive wax layer 9, and an electric current flows through the light bulb 13 to be lit, thereby displaying that the object 11 has reached a preset temperature. In the first embodiment, the display is performed by turning on the light bulb 13. However, it is not always necessary to use a light bulb, and other electric display means such as a buzzer may be used. Even if the temperature of the object 11 exceeds the set temperature and then drops below the set temperature, the conductive wax layer 9 continues to conduct the electrode plates 6 and 6, so that the circuit remains closed.

  Therefore, when the first embodiment is combined with the light bulb 13 or the like and installed in an unmanned facility that is dark and difficult to visually recognize, the abnormal heat generation phenomenon of the object can be easily known by lighting the light bulb 13.

  Further, since the melting action of petroleum-based wax by heat is used, it reacts accurately with temperature, operates reliably and has high durability, and there is almost no risk of malfunction. Furthermore, the structure is simple, the number of parts is small, and it can be manufactured at a low cost. In addition, once the set temperature is exceeded, the circuit continues to be closed even if the temperature drops thereafter, which is particularly effective for detecting abnormally high temperatures in objects installed in dark unmanned facilities such as in a cave.

  FIG. 6 is a side view of Embodiment 2 of the temperature sensor for detecting abnormally high temperatures according to the present invention.

  In the figure, reference numeral 1 denotes a substrate made of an insulating material. On the substrate 1, a pair of rod-like electrode plates 14 and 14 are arranged in series at intervals, and these electrode plates 14 and 14 are arranged in series. Between them, a tongue-like shape is formed, and the start end 15 side is fixed to the opposite end of one electrode plate 14 via a conductive spacer 42, and the open end 16 side is the other end. A leaf spring 18 having a sufficient extra length 17 sufficient to overlap the electrode plate 14 and biased downward, that is, toward the electrode plate 14 is provided. A contact 19 is provided on the lower surface of the leaf spring 18 on the open end 16 side, and a contact 20 is provided on the upper surface of the electrode plate 14 at a position corresponding to the contact 19, and the contact 20 is provided. A liquid absorber 22 having a plate shape made of a blotting paper or the like is extended to the opposite end 21 of the electrode plate 14. Further, a solid petroleum-based wax 23 that melts at a preset temperature is interposed between the contacts 19 and 20, and the contacts 19 and 20 are separated by the wax 23.

  This Example 2 has the configuration as described above, and is fixed to the surface of the object 11 that is to sense an abnormally high temperature as in Example 1 described above, and is the same as Example 1 shown in FIG. The electric display elements such as the power source 12 and the light bulb 13 are connected to each other for use. When the object 11 reaches a preset temperature, it is interposed between the contact points 19 and 20, and these contact points 19 are connected. , 20 is melted, and as shown in FIG. 7, both end points 19 and 20 are in contact with each other, the circuit is closed, and a current flows through the light bulb 13 so that it is lit. When the preset temperature exceeds the preset temperature, the dissolved wax 23 is absorbed by the liquid absorber 22, so that once the set temperature is exceeded, the temperature again falls below the preset temperature. Even if the 19, 20 contact state does not change, the circuit will remain closed, the light bulb 13 continues to light up.

  Accordingly, in the second embodiment, too, in combination with the light bulb 13 and the like, the abnormal high temperature of the object that is dark and difficult to visually recognize can be clearly displayed.

  Further, since the melting action of petroleum-based wax by heat is used, it reacts accurately with temperature, operates reliably and has high durability, and there is almost no risk of malfunction. Furthermore, the structure is simple, the number of parts is small, and it can be manufactured at a low cost. In addition, once the set temperature is exceeded, the circuit continues to be closed even if the temperature subsequently decreases, which is particularly effective in detecting an abnormally high temperature of an object installed in a dark unmanned facility such as in a cave.

  FIG. 8 is a longitudinal sectional side view of Embodiment 3 of the temperature sensor for detecting abnormally high temperatures according to the present invention.

  In the figure, reference numeral 24 denotes a cylindrical casing made of a conductive material in which both end portions 25 and 26 are closed and an outer surface in the vicinity of the end portion 25 is connected to a lead wire 41, and includes one end portion. It is displaced near 25 and is filled with petroleum-based wax 27, and an end portion 28 on the open end side of this wax 27 is sealed with a disk-shaped rubber plate 29. On the other hand, the other end portion 26 side in the casing 24 is filled with a synthetic resin 30 and has an insulating property through the wall surface of the end portion 26 and the synthetic resin 30 along the axial center of the casing 24. A sheath tube 31 is inserted into the casing 24, and a conductive rod-like body 32 is inserted into the sheath tube 31 so that the tip thereof reaches the hollow portion 33 in the casing 24. A contact 34 is provided at the tip of the rod-shaped body 32, and a spring material 36 is stretched between the contact 34 and the end surface 35 of the synthetic resin 30. The rod-shaped body 32 has an end surface 35. It is elastically supported so that it can be retracted in the direction.

  Further, a conductive cylinder 37 is slidably positioned between the contact 34 of the hollow portion 33 of the casing 24 and the rubber plate 29 with a space between the contact 34 and this conductive cylinder. A disc-shaped sealing material 38 is bonded to the front end portion of the body 37. Further, a spring material 39 is stretched between the rear end portion of the conductive cylinder 37 and the end surface of the synthetic resin 30, and the conductive cylinder 37 is attached in the direction in which the wax 27 is filled. It is fast. In the figure, reference numeral 40 denotes an O-ring surrounding the outer periphery of the conductive cylindrical body 37.

  The third embodiment has the configuration as described above. Like the first and second embodiments, the third embodiment is fixed to the surface of the object 11 to be sensed for abnormal temperature, and the first embodiment shown in FIG. As in FIG. 9, the power source 12 and the display element such as the light bulb 13 are connected to each other for use, and when the object 11 reaches a preset temperature, as shown in FIG. The wax 27 is expanded, the conductive cylinder 37 moves in the direction of the contact 34, contacts with it, the circuit is closed, the current flows through the light bulb 13, and the object 11 is preliminarily turned on. Displays that the set temperature has been reached.

  At this time, as the temperature rises, the wax 27 continues to expand, but the contact 34 is elastically held by the spring material 36 and supported so as to be retractable, so that it follows the movement of the conductive cylinder 37. And then retreat and escape from being destroyed by pressing. On the other hand, when the temperature of the object 11 falls below the set temperature, the wax 27 contracts as shown in FIG. 10, but the conductive cylinder 37 is not connected to the wax 27, so Due to the frictional force of the surrounding O-ring 40, the conductive cylinder 37 remains in contact with the contact 34, the circuit remains closed, and the light bulb 13 continues to be lit.

  Therefore, this Example 3 can also clearly display the abnormally high temperature of the object that is dark and difficult to visually recognize, by combining with the light bulb 13 and the like, as in Examples 1 and 2 described above.

  In addition, since the expansion action of petroleum-based wax due to heat is utilized, it reacts accurately with temperature, the operation is reliable and the durability is high, and there is almost no risk of malfunction. Furthermore, the structure is simple, the number of parts is small, and it can be manufactured at a low cost. In addition, once the set temperature is exceeded, the circuit continues to be closed even if the temperature subsequently decreases, which is particularly effective in detecting an abnormally high temperature of an object installed in a dark unmanned facility such as in a cave.

  It can be used in all industrial fields that require temperature control.

1. Substrate 2. 3. Adhesive layer 4. Liquid absorption layer Side edge 6. 6. Electrode plate Hollow housing 8. 8. Insulating wax layer Conductive wax layer 10. Lead piece 11. Object 12. Power supply 13. Light bulb 14. Electrode plate 15. Start 16. Open end 17. Extra length part 18. Leaf spring 19. Contact 20. Contact 21. Opposing side end 22. Liquid absorber 23. Wax 24. Casing 25. End 26. End 27. Wax 28. End 29. Rubber plate 30. Synthetic resin 31. Sheath tube 32. Rod-like body 33. Hollow part 34. Contact 35. End face 36. Spring material 37. Conductive cylinder 38. Sealing material 39. Spring material 40. O-ring 41. Lead wire 42. spacer

Claims (3)

  In the vicinity of the center of the substrate (1) made of an insulating material, a liquid absorption layer (4) made of a liquid absorbent material is provided so that its upper surface is flush with the upper surface of the substrate (1), A pair of striped electrode plates (6), (6) are positioned facing each other so as to be in contact with the pair of side edges (5) of the liquid absorption layer (4), and these electrode plates (6), ( 6) Cover the hollow housing (7) on the center of the upper surface of the substrate (1) so as to cover, and the upper surface of the substrate (1) in the hollow housing (7) has an insulating property and melts at an arbitrary set temperature. An insulating wax layer (8) made of petroleum wax is formed, and further on the upper surface of the insulating wax layer (8), the petroleum wax dissolved in the same temperature as the insulating wax layer (8). Temperature-sensitive switch for detecting abnormally high temperature with conductive wax layer (9) mixed with conductive material superimposed   On the substrate (1) made of an insulating material, a pair of electrode plates (14), (14) in the form of rods are arranged in series at intervals, and between the electrode plates (14), (14). It has a tongue-like shape, the start end (15) side is fixed to the opposite end of one electrode plate (14), and the open end (16) is long enough to overlap the other electrode plate (14). Then, a conductive leaf spring (18) urged downward is provided, and the contact (19) corresponds to the lower surface of the open end (16) side of the leaf spring (18), corresponding to the contact (19). A contact (20) is provided on the upper surface of the electrode plate (14) at the position, and a plate-like liquid absorber (22) is extended to the opposite end (21) of the electrode plate (14), A solid petroleum-based wax (23) that melts at a desired set temperature is interposed between the pair of contacts (19) and (20), and both contacts (1 ), (20) abnormally high temperature sensed temperature sensing switch, characterized in that forcibly separated between.   Both ends (25) and (26) are closed, and the casing (24) made of a conductive material having a cylindrical shape with a lead wire (41) connected to the outer surface is closer to one end (25). Displaced and filled with petroleum-based wax (27) whose end (28) on the open end side is sealed by a disk-shaped rubber plate (29), and penetrates the other end (26). A conductive rod-shaped body (32) accommodated in an insulating sheath tube (31) is inserted along the axial center of the casing (24), and a contact point ( 34), and a spring material (36) is stretched between the contact (34) and a portion near the end (26) of the casing (24) to connect the contact (34) to the casing (24). Elastically supported in a retractable state in the direction of the end (26), the contact (34) and the rubber plate (29) The conductive cylindrical body (37) is slidably positioned between the two, and a disc-shaped sealing material (38) is bonded to the end face of the conductive cylindrical body (37) near the rubber plate (29). A spring material (39) is stretched between the end face of the casing and the end face of the casing (24), and the conductive cylinder (37) is biased toward the rubber plate (29). Sensing temperature sensitive switch.

Images