JP7085604B2 - Temperature sensor and cooking equipment - Google Patents

Description

The present invention relates to a temperature sensor having a movable body for maintaining a contact state with a temperature measurement target, and as an example, relates to a temperature sensor that contacts the bottom surface of a cooked container to be heated and measures the temperature of the cooking container.

For example, cooking equipment such as a gas stove and an electric rice cooker are provided with a temperature sensor. This temperature sensor is for contacting the bottom surface of cooking containers such as pots and frying pans to measure the temperature of these cooking containers, and the heat collector in contact with the bottom surface of the cooking container moves back and forth in the vertical direction. It is provided so that it can be done. An elastic force is applied upward to this heat collector by a coil spring. For example, a thermistor element is provided in contact with or in close proximity to the heat collector as a heat sensitive element, and the temperature of the cooking container is measured by the thermistor element receiving the heat transferred from the heat collector. The thermistor element referred to here includes a thermistor as a heat-sensitive body and a lead wire electrically connected to the thermistor.

This temperature sensor is provided in the central region of the trivet, for example, in the case of a gas stove, and when the cooking container is placed on the trivet, the cooking container comes into contact with the heat collector and pushes down the heat collector. Since an elastic force is applied to the heat collector upward, the contact state between the cooking container and the heat collector is maintained by the elastic force during cooking. When cooking is finished and the cooking container is lifted from the trivet, the heat collector is pushed up to its original position by elastic force. As described above, this kind of temperature sensor has a heat collector as a movable body that moves back and forth.

As disclosed in Patent Document 1, for example, these temperature sensors have a detection function of a measurement target for detecting whether or not they are in contact with the bottom surface of a cooking container such as a pot or a kettle. The outline of the detection of the cooking container to be the temperature measurement is performed by detecting the magnetic field generated from the permanent magnet.
Further, this temperature sensor includes a support tube for supporting the heat collector. For example, as shown in Patent Document 1, this support tube has a linear shape in addition to the form of connecting two linear tubes. A form of connecting a tube and an L-shaped tube is known.

Japanese Unexamined Patent Publication No. 2018-048760

Since this temperature sensor is used near a fire, many members, including support tubes, are made of metallic material. Even if it is made of a metal material, the cost can be suppressed if the structure of the member is simple. However, for example, in the case of an L-shaped tube constituting a support tube, the processing cost for bending the linear tube increases.

Based on the above, it is an object of the present invention to provide a temperature sensor having a detection function for a measurement target at low cost.

The temperature sensor of the present invention detects the presence / absence of a measurement target and the temperature.
The temperature sensor includes a heat-sensitive unit that detects the temperature of the measurement target, a pair of electric wires that are electrically connected to the heat-sensitive body, and a detection unit that detects the presence or absence of the measurement target according to the movement of the heat-sensitive unit. , A protective tube through which a pair of electric wires is inserted.
The protective tube includes a straight tube into which the electric wire is drawn, and a bent tube in which the electric wire is drawn out, which is connected to the straight tube including the bent portion.
The bent portion in the present invention is made of a resin material.

In the temperature sensor of the present invention, preferably one or both of the straight pipe and the bent pipe are made of a resin material.

The bent pipe in the present invention preferably includes a pull-in portion connected to a straight pipe and a pull-out portion connected to the pull-in portion via the bend portion, and one or both of the pull-in portion and the pull-out portion are made of a resin material. It is composed.

The bent pipe in the present invention preferably includes an integrally configured pull-in portion and a pull-out portion, and a fixing piece involved in connecting the straight pipe and the pull-in portion and the pull-out portion.

The bent pipe in the present invention preferably includes a first pipe member and a second pipe member that are symmetrical with each other in the width direction, and the straight pipe is accommodated across the first pipe member and the second pipe member. It comprises a locking piece to be locked.

In the bent tube in the present invention, the lead-in portion is preferably made of a resin material, and the lead-out portion is made of a metal material.

The bent tube in the present invention is preferably a straight tube made of a metal material.

The detection unit in the present invention preferably includes a magnetic field generator that generates a magnetic field with respect to the surroundings, a magnetic field detection element that reciprocates between a region covered by a magnetic field from the magnetic field generator and a region not covered by the magnetic field. The magnetic field detection element is connected across a pair of wires or is connected in series to one of the pair of wires.

The present invention provides a cooking apparatus including the temperature sensor in the present invention for detecting the presence / absence of a measurement target and the temperature.

According to the present invention, since the lead-in portion including the bent portion and the lead-in portion into which the joint wire is drawn is made of a resin material, it is possible to provide a temperature sensor having a detection function of a measurement target at low cost.

The temperature sensor which concerns on 1st Embodiment of this invention is shown, (a) is a front view, (b) is a side view. It is a vertical sectional view which shows the movable body of the temperature sensor which concerns on 1st Embodiment, and its surroundings. It is a figure which shows the heat-sensitive element of the temperature sensor which concerns on 1st Embodiment. It is a vertical sectional view which shows the part of the bending tube of the temperature sensor which concerns on 1st Embodiment. It is a vertical sectional view which shows the detection part of the temperature sensor which concerns on 1st Embodiment. The magnetic shield of the temperature sensor according to the first embodiment is shown as a single unit, (a) is a plan view, (b) is a side view, and (c) is a front view. The operation of the movable body of the temperature sensor according to the first embodiment is shown, (a) shows the position when there is no load on which the cooker is not mounted, and (b) is the movable body because the cooker is mounted. It shows the position when descending. It is a vertical sectional view which shows the operation of the detection part of the temperature sensor which concerns on 1st Embodiment and the vicinity thereof, and (a) is the state which the cooker is not placed and the magnetic field from a permanent magnet is shielded (shield). (Position) is shown, and (b) shows a state (unshielded position) in which the cooker is mounted and the magnetic field from the permanent magnet reaches the reed switch without being shielded. The temperature sensor which concerns on the 2nd Embodiment of this invention is shown, (a) is a front view, (b) is a side view. A detection unit of a temperature sensor according to a second embodiment of the present invention is shown, (a) is a plan view, and (b) is a side view showing an integrally configured housing. It is a vertical cross-sectional view which shows the detection part of the temperature sensor which concerns on 3rd Embodiment of this invention and the vicinity thereof, (a) is a reed switch at a position facing a permanent magnet, which is not a cooking container. The magnetic detection position is shown, and (b) shows the magnetic field non-detection position where the cooking container is placed and the reed switch is separated from the permanent magnet. The operation of the magnetic field detector of the temperature sensor according to the third embodiment of the present invention is shown, (a) shows a state where the magnetic field detector is receiving a magnetic field, and (b) is a state where the magnetic field detector is not receiving a magnetic field. It shows the state. It is a side view of the temperature sensor which concerns on 4th Embodiment of this invention. It is a vertical cross-sectional view which shows the detection part of the temperature sensor which concerns on 4th Embodiment of this invention and the vicinity thereof, (a) is a reed switch at a position away from a permanent magnet that a cooking container is not placed. The magnetic field non-detection position is shown, and (b) shows the magnetic field detection position where the cooking container is placed and the reed switch is located at the position facing the permanent magnet. It is a top view of the detection part. It is a figure which shows the main part of the gas stove provided with the temperature sensor by this embodiment. It is a vertical sectional view which shows the main part of the rice cooker provided with the temperature sensor by this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Hereinafter, four embodiments of the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment will be described, but all of them include a bent portion in the protective tube supporting the movable body portion. The bent portion is made of a resin material.

[First Embodiment]
The temperature sensor 1 according to the first embodiment will be described with reference to FIGS. 1 to 8. The temperature sensor 1 integrally comprises a bending pipe 52 including a bending portion 59 that bends in an L shape with a resin material. Further, the straight pipe 51 connected to the bent pipe 52 is made of a metal material. The straight pipe 51 and the bent pipe 52 are connected without a gap.
In the temperature sensor 1, as shown in FIG. 1 and the like, the upper (U), lower (L), front (F), and rear (B) are specified. Above these, (U) and the like shall be relatively specified. Further, in the temperature sensor 1, as shown in FIG. 1, it is assumed that the vertical direction (V), the horizontal direction (H), and the width direction (W) are specified. The vertical direction (V) and the horizontal direction (H) are premised on a state in which the temperature sensor 1 is incorporated in, for example, the gas stove 100.

[Overall configuration of temperature sensor 1: FIGS. 1, 2, 2, 15]
As an example, as shown in FIG. 15, the temperature sensor 1 contacts the bottom surface 108 of a cooking container 107 such as a pot and detects the temperature of the gas stove 100 as a cooking device. The temperature sensor 1 is provided at or near the center between the trivets 106 and 106 on which the cooking container 107 is placed.
As shown in FIGS. 1 and 2, the temperature sensor 1 includes a heat-sensitive element 10 which is a main element of temperature detection, a connecting wire 30 electrically connected to a lead wire 13 of the heat-sensitive element 10, and a heat-sensitive element 10. The sensor holding body 40 for holding is provided. Then, as shown in FIG. 15, the temperature sensor 1 is protected so that the contact surface of the heat collector 42, which will be described later, protrudes upward (U) from the upper (U) end of the trivet 106, 106. It is attached to the gas stove 100 via the pipe 50.

Hereinafter, each component of the temperature sensor 1 will be described in order, and then the operation of the temperature sensor 1 will be described.
[Thermal element 10: FIG. 3]
As shown in FIG. 3, the heat-sensitive element 10 is provided via electrodes 12, 12 formed on the heat-sensitive body 11 and two facing surfaces (left and right in the figure) of the heat-sensitive body 11, respectively, and electrodes 12, 12. A pair of lead wires 13 and 13 electrically connected to the heat sensitive body 11 and a protective layer 16 for sealing the heat sensitive body 11 are provided.

As the heat sensitive body 11, a metal oxide or a metal having a characteristic that the electric resistance value changes with a temperature change is used. A constant current is passed through the pair of lead wires 13 and 13 to the heat sensitive body 11, the voltage between the electrodes 12 and 12 of the heat sensitive body 11 is measured by a measuring instrument, and the resistance value is measured from Ohm's law (E = IR). And detect the temperature.
As the metal oxide, a thermistor (Thermally Sensitive Resistor) is preferably used, and typically an NTC thermistor (Negative Temperature Coefficient Thermistor) having a negative temperature coefficient is used. Platinum (for example, Pt100; JIS-C1604) is preferably used as the metal.

The electrode 12 electrically connects the heat sensitive body 11 and the lead wire 13, and is preferably made of a precious metal such as gold or platinum.
The lead wire 13 is a conducting wire through which a constant current flows through the heat sensitive body 11, and is composed of a core wire 14 and an insulating coating 15 covering the core wire 14. A metal material having high electrical conductivity, typically copper, is used for the core wire 14. The core wire 14 of the lead wire 13 is made of a single wire.

When glass is used as the protective layer 16, a Dumet Wire is preferably used for the core wire 14. The jumet wire is a composite wire in which an inner layer made of an iron-nickel alloy and an outer layer made of copper are clad. The coefficient of linear expansion of the iron-nickel alloy constituting the inner layer is close to that of glass. Therefore, even when the protective layer 16 is made of glass, the use of the Jumet wire prevents the protective layer 16 from being damaged due to the thermal expansion of the core wire 14.
The insulating coating 15 is an electrical insulator that covers the outer peripheral surface of the core wire 14.
The lead wire 13 has the same role as the joint wire 30 described later in that it is a wire that allows a constant current to flow through the heat sensitive body 11, but the wire that is directly connected to the heat sensitive body 11 is referred to as a lead wire 13 and is a lead wire. The electric wire indirectly connected to the heat sensitive body 11 via the 13 is distinguished from the connecting wire 30.

The protective layer 16 is provided in order to prevent chemical and physical changes from occurring in the heat sensitive body 11 by sealing the heat sensitive body 11 and maintaining it in an airtight state. Glass is preferably used as the protective layer 16, but a resin material may also be used depending on the environment in which the temperature sensor 1 is used.

[Join line 30: Fig. 5]
The joint wire 30 shown in FIG. 5 is an electric wire for electrically connecting the heat sensitive element 10 and an electric circuit or the like in a subsequent stage (not shown), and includes a core wire 31 and an insulating coating 33 covering the core wire 31. ..
The core wire 31 is a stranded wire produced by twisting a plurality of, for example, 7 or 12 conductors. For each of the conductors constituting the stranded wire, a conductor having a smaller diameter than the core wire 14 of the lead wire 13 is used.
The joint wire 30 is inserted through a protective tube 50, one end thereof is electrically connected to the end portion of the lead wire 13, for example, by welding, and the other end is connected to an electric circuit or the like (not shown). The joint wire 30 has a wire diameter sufficiently smaller than that of the protective tube 50, and is not deformed even when a pressing force is applied from the cooking container 107 via the contact surface 42A (see FIG. 1) of the movable body 41. A strong wire is used. Further, when the movable body 41 moves, the joint line 30 is arranged so as to be movable in the axial direction of the protective tube 50 in response to the movement.

[Sensor holder 40: FIG. 2]
As shown in FIG. 2, the sensor holding body 40 includes a movable body 41 provided so as to be movable downward (L) when it comes into contact with the bottom surface 108 of the cooking container 107, and a protective tube 50 for supporting the movable body 41. It is equipped with.

[Movable body 41: FIG. 1, FIG. 2, FIG. 15]
As shown in FIGS. 1, 2, and 15, the movable body 41 has a plate-shaped heat collector 42 whose front surface is in contact with the bottom surface 108 of the cooking container 107 and a back surface of the heat collector 42. A storage cylinder 43 provided on the side for accommodating and holding the heat sensitive body 11, a tubular holder 44 for supporting the heat collecting body 42 by the upper end portion 44A, and from the upper end portion 44A to the vicinity of the lower end portion 44B of the holder 44. A tubular protective tube 45 and a coil spring 46 are provided. The heat collector 42, the accommodating cylinder 43, the holder 44, the protective tube 45, and the coil spring 46 are preferably made of a metal material having heat resistance and oxidation resistance, for example, stainless steel.

The heat collector 42 is provided with a flat contact surface 42A on the front surface so as to be in surface contact with the bottom surface 108 of the cooking container 107.
The storage cylinder 43 includes an upper end portion 43A formed in a flange shape. The upper end portion 43A is joined to the back surface 42B of the heat collector 42 by, for example, welding, so that the side of the upper end portion 43A of the accommodating cylinder 43 is closed. The lower end 43B of the storage cylinder 43 is open. The heat-sensitive body 11 of the heat-sensitive element 10 is housed inside the storage cylinder 43. The heat sensitive body 11 is housed in the storage tube 43 so that the upper end thereof contacts the back surface 42B of the heat collecting body 42. It is preferable that the inside of the accommodating cylinder 43 is filled with a filler that fills the gap between the accommodating body 11 and the heat sensitive body 11. As the filler, it is preferable to use a heat-resistant inorganic adhesive, particularly one containing a metal oxide filler, for example, an Al ₂ O ₃ filler.

The holder 44 is a tubular member having a diameter larger than that of the accommodating cylinder 43, and is composed of an upper end portion 44A and a lower end portion 44B having different diameters. A storage cylinder 43, a heat sensitive element 10, and an insulating tube 47 are housed inside the upper end portion 44A.
The upper end portion 44A of the holder 44 is formed in a flange shape, and the peripheral edge portion of the heat collector 42 is folded over the entire peripheral edge of the upper end portion 44A of the holder 44. As a result, the upper end portion 44A side of the holder 44 is sealed by the heat collector 42, so that even if there is a spill from the cooking container, the spilled juice does not infiltrate into the inside.

On the lower side (L) of the upper end portion 44A of the holder 44, a lower end portion 44B having a diameter smaller than that of the upper end portion 44A is formed via the step portion 44C. An opening 44E is formed on the lower (L) side of the lower end portion 44B, and the protective tube 50 projects from the opening 44E to the outside of the holder 44. The position of the movable body 41 is defined by the step portion 44C coming into contact with the washer 54 formed inside the protective tube 50. The position of the movable body 41 at this time is the position where the movable body 41 has moved most upward (U) with respect to the protective tube 50, and when no load is applied to the heat collector 42, that is, the cooking container 107 is a trivet. When not mounted on 106, 106, the movable body 41 stays in this position. Hereinafter, the position of the heat collector 42 when no load is applied to the heat collector 42 (no load) is referred to as a non-mounting position.

The upper end portion 45A of the protective tube 45 is closed, and the inside thereof forms a cylindrical gap 45B. Further, the lower end portion 45C of the protective tube 45 is open.
Since the holder 44 and the heat collector 42 are crimped, the space between the holder 44 and the heat collector 42 is in a liquid-tight state. Further, the holder 44 and the protective tube 45 are press-fitted at the step portion 44C of the holder 44, but a minute gap is left at the upper end portion 45A of the protective tube 45.

The coil spring 46 is an elastic body for urging the heat collector 42, the holder 44, and the protective tube 45 upward (U) with respect to the protective tube 50. The coil spring 46 is housed inside the holder 44, its upper end 46A is supported on the back surface 42B side of the heat collector 42, and the lower end 46B is supported by a washer 54 fixed to the upper end of the straight tube 51. To.

As shown by the alternate long and short dash line in FIG. 15, the contact surface 42A of the heat collector 42 projects upward (U) from the upper ends of the trivets 106 and 106 at the non-mounting position. Therefore, when the cooking container 107 is placed on the trivet 106, 106 of the gas stove 100, the contact surface 42A of the heat collecting body 42 comes into contact with the bottom surface 108 of the cooking container 107, and the heat collecting body 42 is lowered (L) by the own weight of the cooking container 107. ) Pushed down to the side. Then, when the cooking container 107 is placed on the trivets 106 and 106, the contact surface 42A of the heat collector 42 is pushed down to the position indicated by the solid line below (L) in FIG. Therefore, the coil spring 46 has an elastic force sufficient to maintain the contact of the heat collector 42 with the bottom surface 108 of the cooking container 107 when the cooking container 107 is placed on the trivets 106 and 106. Is used. Hereinafter, the position of the heat collector 42 after the cooking container 107 is mounted on the gas stove 100 is referred to as a mounting position. In FIG. 15, only the top of the heat collector 42 in the non-mounted position is shown by a long-dashed line, and the entire heat collector 42 in the mounted position is shown by a solid line.
The insulating tube 47 is a tube having an electrical insulating property for protecting the pair of lead wires 13, 13. A pair of lead wires 13 and 13 of the heat sensitive body 11 are inserted through the insulating tube 47, and their ends are electrically connected to the joint wire 30 inside the protective tube 50 described later.

[Protective tube 50: Fig. 1, Fig. 2, Fig. 4]
As shown in FIGS. 1 and 2, the protective tube 50 is provided along the vertical direction (V) and is connected to the straight tube 51 connected to the holder 44 and the straight tube 51 connected to the straight tube 51 in the horizontal direction (H). ), And a bent pipe 52 provided along the above. The straight tube 51 is made of a metal material, for example, a tube made of austenitic stainless steel (JIS SUS304) which is a non-magnetic material. The method for manufacturing this pipe is arbitrary, and known pipe making methods such as seamless pipe making, welded pipe making, and spiral pipe making are applied. The bent pipe 52 is integrally formed by injection molding a resin material, for example, an epoxy resin.
The connection between the straight pipe 51 and the bent pipe 52 may be made by using a chemical means such as an adhesive or a mechanical means such as a screw.

[Straight tube 51: Fig. 1, Fig. 2, Fig. 4]
As shown in FIG. 2, the straight pipe 51 is formed with an upper end portion 51A protruding upward (U) in a flange shape, and a washer 54 is arranged on the lower surface of the upper end portion 51A. The washer 54 is a cylindrical member fitted to the outer periphery of the protective tube 50. The washer 54 regulates the amount of movement of the holder 44 upward (U) of the movable body 41. When the step portion 44C of the holder 44 abuts on the washer 54, the movement of the movable body 41 upward (U) is restricted. The washer 54 is preferably made of the same metal material as the holder 44.

As shown in FIGS. 1 and 4, the straight pipe 51 is provided with a lower end portion 51B having a half-split structure at the lower side (L). The lower end portion 51B has a pipe wall remaining on the front (F) side, and the remaining pipe wall forms a fixed end 51C related to fixing with the bent pipe 52. Further, the pipe wall 56 is removed from the rear side (B) of the lower end portion 51B, and the inside and the outside of the straight pipe 51 communicate with each other to form a passage 51D of the connecting line 30.

[Bending tube 52: FIGS. 1 and 4]
Next, as shown in FIGS. 1 and 4, the bent pipe 52 is involved in the connection with the straight pipe 51, and is integrated with the lead-in portion 52A into which the joint line 30 is drawn and the lead-in portion 52A via the bend portion 59. The joint line 30 is provided with a drawer portion 52B which is connected to the target and is drawn out from the rear (B). The bending pipe 52 is inserted at the boundary between the insertion portion 52A and the extraction portion 52B, and includes a fixing piece 52C for fixing the straight pipe 51 to the bending pipe 52. The fixed piece 52C is manufactured as a separate body from the pull-in portion 52A and the pull-out portion 52B, but is assembled at the intersection of the pull-in portion 52A and the drawer portion 52B.

The lead-in portion 52A has a cylindrical shape, and includes a fitting hole 52A1 which is a cylindrical gap into which the straight pipe 51 is fitted, and a release groove 52A3 which is a gap connected to the fitting hole 52A1 and connected to the outside. .. When the straight pipe 51 is fitted into the fitting hole 52A1, the space between the fitting hole 52A1 and the release groove 52A3 is closed by the fixed end 51C of the straight pipe 51.

As shown in FIG. 4, the drawer portion 52B is a cylindrical portion formed so as to be orthogonal to the lead-in portion 52A. Inside the drawer portion 52B, a main hole 52B1 connected to the fitting hole 52A1 and connected to the outside at the rear (B), and a sub hole 52B3 connected to the main hole 52B1 and having an opening diameter larger than that of the main hole 52B1 are formed. .. The connecting wire 30 is pulled out from the rear (B) through the fitting hole 52A1 and the main hole 52B1. The auxiliary hole 52B3 is involved in fixing the fixing piece 52C, which will be described later.

Next, as shown in FIG. 4, a fixed piece 52C is provided at the intersection of the pull-in portion 52A and the pull-out portion 52B. The fixed piece 52C is assembled to the intersection shown in FIG. 4 before connecting the straight pipe 51 to the bent pipe 52.
The fixing piece 52C has an insertion portion 52C1 inserted into the rear (B) side of the main hole 52B1 in a state of being assembled to the bending pipe 52, and a locking body 52C3 connected to the insertion portion 52C1 and arranged in the fitting hole 52A1. And a sealing portion 52C5 which is connected to the insertion portion 52C1 and is provided with a locking body 52C3 and a predetermined interval in the horizontal direction (H). Both the insertion portion 52C1 and the sealing portion 52C5 have a columnar appearance shape, and the locking body 52C3 has a fin-like appearance shape.
When the fixed piece 52C is assembled at a predetermined position, as shown in FIG. 4, the lower end portion of the fixed end 51C is inserted between the locking body 52C3 and the sealing portion 52C5. As a result, the straight pipe 51 is positioned in the horizontal direction (H).

[Detection unit 60: FIG. 5]
As shown in FIG. 5, the drawer portion 52B of the bending pipe 52 is provided with a detection portion 60. The detection unit 60 is provided to detect that the cooking container is placed on the cooking device. The detection unit 60 can detect that the cooking container is not mounted on the cooking device, as opposed to the detection of the loading.
The detection unit 60 is from a magnetic field generator 69 composed of a magnetic shield 61 fixed to a joint line 30 arranged inside the protective tube 50, a permanent magnet arranged outside the protective tube 50, and a magnetic field generator 69. It is equipped with a magnetic field detector 71 that operates in response to the magnetic field of the above.

<Magnetic shield 61>
The magnetic shield 61 includes a shield 63 for preventing the magnetic field from the magnetic field generator 69 from reaching the magnetic field detector 71, a holder 65 for fixing the magnetic shield 61 to the joint wire 30, and a shield 63 and a holder 65. It is provided with a connection piece 67 for connecting the above. As an example, the magnetic shield 61 is integrally formed by machining a metal plate showing a ferromagnet. As the material of this metal plate, a soft magnetic material having magnetic characteristics capable of absorbing magnetic flux from the magnetic field generator 69 without leakage is used.

As shown in FIG. 6, the shield 63 has a cylindrical shape having a predetermined dimension in the axial direction (C). A joint wire 30 is inserted inside the shield 63. The inner diameter of the shield 63 is set so that the joint wire 30 is surrounded by a predetermined play. The outer diameter of the shield 63 is set smaller than the inner diameter of the protective tube 50.
The dimension in the axial direction (C) of the shield 63 is a length that can absorb the magnetic flux from the magnetic field generator 69 without leakage when it is in a position facing the magnetic field generator 69, for example, the axial direction of the magnetic field detector 71. It is set to be substantially the same as the length of (C). The length of the shield 63 is such that it does not prevent the magnetic field of the magnetic field generator 69 from reaching the magnetic field detector 71 when the cooking container 107 is placed on the trivets 106 and 106 and the shield 63 moves. If there is, it is not limited to this.

Further, here, as an example, the shape of the shield 63 shows a cylindrical shape, but the present invention is not limited to this. This is because the shape of the shield 63 does not need to be cylindrical as long as the function of the magnetic shield can be exhibited. For example, only the side of the shield 63 facing the magnetic field generator 69 may be covered, and the side facing the magnetic field detector 71 may be open or rectangular.

As shown in FIGS. 6A to 6C, the holder 65 has a U-shaped shape in which the upper part of the drawing is open before the joint line 30 is crimped. By tightening, it is formed into a substantially cylindrical shape. By crimping the holder 65, the magnetic shield 61 is fixed to the joint wire 30 and moves with the movement of the joint wire 30.
The connection piece 67 is processed so as to be inclined toward the axis so that the axes of the shield 63 and the holder 65 coincide with each other. In the present embodiment, the case where the axis of the shield 63 and the axis of the holder 65 coincide with each other is illustrated, but the present invention is not limited to this. That is, if the holder 65 does not slide with the inner wall of the protective tube 50 when the magnetic shield 61 moves, any inclination or shape can be adopted.
The holder 65 is arranged on the opposite side of the heat sensitive body with respect to the shield 63.

<Magnetic field generator 69>
As shown in FIG. 5, the magnetic field generator 69 is fixed at a predetermined position on one outer side of the protective tube 50 in the radial direction. The magnetic field from the magnetic field generator 69 acts on the magnetic field detector 71.
The material of the magnetic field generator 69 is arbitrary as long as it has a magnetic force that the magnetic field reaches the magnetic field detector 71. For example, in addition to the ferrite permanent magnet, rare earth magnets such as Sm-Co type and Nd-Fe-B type can be used. Since the magnetic field generator 69 used in the cooking equipment is heated to about 150 ° C., it is necessary to consider the Curie point. However, the Curie point of rare earth magnets such as ferrite permanent magnets (450 ° C), Sm-Co type (750 ° C), and Nd-Fe-B type (850 ° C) exceeds 150 ° C.
Further, the magnetic field generator 69 is not limited to a permanent magnet made of a sintered body, and a bonded magnet in which magnet powder is dispersed in a resin can also be used.
Further, the magnetic field generator 69 is not limited to a permanent magnet, and an electromagnet can also be used.

The magnetic field generator 69 is fixed to the protective tube 50 in a state of being housed in a magnet housing 76 made of, for example, a resin material. As described above, since the protective tube 50 is made of austenitic stainless steel (JIS SUS304) which is a non-magnetic material, the magnetic field from the magnetic field generator 69 passes through the protective tube 50 and is inside the protective tube 50 and magnetically. Depending on the position of the shield 61, it can reach the magnetic field detector 71.

<Magnetic field detector 71>
The magnetic field detector 71 is a switch for switching on / off of an electric circuit (not shown) by using a magnetic field from the outside. As shown in FIG. 5, the magnetic field detector 71 includes a detection element 73, lead wires 75A and 75B each connected to a pair of ferromagnetic lead wires (not shown) of the detection element 73, and a detection element 73 and lead wires 75A and 75B. It is provided with an element housing 77 for accommodating the above.
The detection element 73 is composed of, for example, a reed switch, and is arranged at a predetermined position outside the protection tube 50. In the detection element 73, a pair of ferromagnetic leads are enclosed in a glass tube with a predetermined contact interval. The pair of ferromagnetic leads are magnetized when they receive a magnetic field from the magnetic field generator 69, and their free ends come into contact with each other, closing the magnetic circuit (ON). Further, if the magnetic field is eliminated, the elasticity of each lead causes the contact to be released, and the magnetic circuit is opened (OFF).

The magnetic field detector 71 is fixed to the protective tube 50 in a state of being housed inside the element housing 77. The detection element 73 is fixed to the outside of the other side in the radial direction of the protective tube 50, and is provided at a position opposite to the magnetic field generator 69 with the protective tube 50 interposed therebetween.

The lead wires 75A and 75B are lines for electrically connecting the detection element 73 and an electric circuit (not shown). In the present embodiment, this electric circuit detects whether or not the cooking container 107 is placed on the trivet 106 by the ON / OFF operation by the detection element 73. That is, in this electric circuit, the cooking container 107 is not placed on the trivet when the detection element 73 is non-conducting (OFF), and the cooking container 107 is placed on the trivet 106 when the detection element 73 is conducting (ON). It is designed to detect that.

[Operation of temperature sensor 1]
The operation and operation of the temperature sensor 1 having the above configuration will be described with reference to FIGS. 7, 8 and 15.
When the cooking container 107 is not mounted on the trivet 106 of the gas stove 100 to which the temperature sensor 1 is mounted, the movable body 41 is located at the non-mounting position shown by the alternate long and short dash line in FIG.
As shown in FIGS. 7 (a), 7 (b) and 15, when the cooking container 107 is placed on the trivet 106 of the gas stove 100, the heat collector 42 comes into contact with the bottom surface of the cooking container 107, and the movable body 41 Moves downward (L). At this time, as shown in FIG. 7B, the holder 44 and the protective tube 45 also move together with the heat collector 42 against the elastic force of the coil spring 46. Since the elastic force from the coil spring 46 is applied to the movable body 41 in the upward U direction, when the cooking container 107 is placed on the trivet 106, the contact surface 42A maintains the state of being in contact with the cooking container 107. At the same time, it stops at the mounting position shown by the solid line in FIG. When the cooking container 107 is removed from the trivet 106 at the end of cooking, the heat collector 42, the holder 44, and the protective tube 45 move upward U due to the elastic force of the coil spring 46. As shown in FIG. 7A, the heat collector 42 and the like stop at a non-mounting position where the step portion 44C of the holder 44 is in contact with the washer 54. As described above, in the temperature sensor 1, the movable body 41 holding the heat sensitive body 11 reciprocates between the non-mounted position and the mounted position.

Since the movement of the movable body 41 involves the movement of the joint line 30, the magnetic shield 61 fixed to the joint line 30 also moves with the movement of the movable body 41.

FIG. 8A shows the position of the magnetic shield 61 when the movable body 41 remains in the non-mounted position. At this time, the magnetic shield 61 is located between the magnetic field generator 69 and the magnetic field detector 71 (detection element 73). Hereinafter, the position of the magnetic shield 61 at this time is referred to as a shield position.
When the magnetic shield 61 is in the shield position, the shield 63 of the magnetic shield 61 is located between the magnetic field generator 69 and the detection element 73 of the magnetic field detector 71, so that the magnetic field generated from the magnetic field generator 69 is shielded. Absorbed by 63. Therefore, the detection element 73 does not receive the magnetic field from the magnetic field generator 69. As a result, the magnetic circuit of the magnetic field detector 71 is opened (OFF).

FIG. 8B shows the position of the magnetic shield 61 when the movable body 41 remains in the mounting position. The position of the magnetic shield 61 at this time is referred to as an unshielded position.
At this time, since the shield 63 of the magnetic shield 61 is retracted from between the magnetic field generator 69 and the detection element 73 of the magnetic field detector 71, the magnetic field generated from the magnetic field generator 69 is not absorbed by the shield 63. Therefore, the detection element 73 receives the magnetic field generated from the magnetic field generator 69. That is, the magnetic field detector 71 can detect that the magnetic circuit is closed (ON) and the cooking container 107 is placed on the trivets 106 and 106.

[Action / effect of temperature sensor 1 (first embodiment)]
Next, the operation / effect of the temperature sensor 1 according to the present embodiment will be described.
In the temperature sensor 1, the bending pipe 52 including the bending portion 59 is made of a resin material. Therefore, the price of the temperature sensor 1 can be suppressed as compared with the case of using a tube member made of a metal material having a similar structure. Further, by forming the bent tube 52 including the bent portion 59 with a resin material, it is necessary to cover the detection element 73 with an insulating tube in order to secure the electrical insulation of the detection element 73 including, for example, a reed switch. Is gone. Therefore, the price of the temperature sensor 1 can be suppressed from this point as well. These are the effects common to the temperature sensor 2 to the temperature sensor 4.

Further, by forming the bent pipe 52 with a resin material, it is possible to obtain a magnetic effect. That is, it is the magnetic field generator 69, for example, a permanent magnet that operates the detection element 73, for example, the reed switch. When the structural material made of the surrounding magnetic material is magnetized, the magnetic force of the permanent magnet is disturbed by the magnetic force of the structural material, and the detection element 73 may not be able to operate properly. On the other hand, if the bent pipe 52 is made of a resin material that is a non-magnetic material, it will not be disturbed by the magnetic force from the bent pipe 52. This is also an effect common to the temperature sensor 2 to the temperature sensor 4.

Further, in the connection portion between the straight pipe 51 and the bent pipe 52, the fixed piece 52C is prepared as a separate member from the bent pipe 52, and the fixed piece 52C is fitted with the fixed end 51C of the straight pipe 51. Have. As a result, according to the temperature sensor 1, the straight pipe 51 and the bent pipe 52 can be more reliably connected.

[Second Embodiment]
Next, the temperature sensor 2 according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. Regarding the parts common to the temperature sensor 1 according to the first embodiment, the same reference numerals as those of the temperature sensor 1 are attached to FIGS. 9 and 10, and the description thereof will be omitted.

The temperature sensor 2 is composed of two first pipe members 152A and a second pipe member 152B in which the bending pipe 152 corresponding to the bending pipe 52 is divided in the width direction (W). Further, in the temperature sensor 2, the housing portion constituting the detection unit 60 is integrally formed of a resin material. The temperature sensor 2 including these two characteristic differences will be described below, focusing on the differences from the temperature sensor 1.

[Straight tube 151]
In the temperature sensor 2, a flange 51E is formed on the lower end portion 51B of the straight tube 151. The flange 51E is provided to improve the joint strength between the straight pipe 51 and the bent pipe 152. The flange 51E is inserted into the locking groove provided in the first pipe member 152A and the second pipe member 152B to prevent the straight pipe 151 and the bent pipe 152 from coming off.
Unlike the temperature sensor 1, the straight tube 151 does not adopt a half-split structure, and is composed of a tube member extending in the circumferential direction up to the lower end portion 51B thereof. Further, the straight tube 151 is made of the same material as the straight tube 51.

[Bending tube 152]
The bent pipe 152 is composed of two first pipe members 152A and a second pipe member 152B which are divided in the width direction (W) and joined by an adhesive. The first pipe member 152A and the second pipe member 152B have a symmetrical shape and structure that are symmetrical to each other in the width direction (W).
The bent pipe 152 includes an accommodating hole 152C for accommodating the lower end portion 51B including the flange 51E of the straight pipe 151 inside the lead-in portion 52A. The accommodating hole 152C is formed so as to straddle the first pipe member 152A and the second pipe member 152B, and includes a portion for accommodating the straight pipe 151 forming a cylinder and a portion for accommodating the flange 51E. By accommodating the flange 51E in the accommodating hole 152C, the flange 51E is locked across the first pipe member 152A and the second pipe member 152B. Although the flange 51E is illustrated here, another mechanical element that is locked across the first pipe member 152A and the second pipe member 152B may be provided in place of the flange 51E.

The bending pipe 152 is provided with a first barb 52D and a second barb 52F in the lead-in portion 52A to prevent the spilled broth from falling downward.
The first return 52D has a brim-like shape provided by opening a first soup pool 52E composed of minute gaps at one end of the lead-in portion 52A in the horizontal direction (H). The broth that has flowed into the first return 52D accumulates in the first soup pool 52E between the first return 52D and the lead-in portion 52A, thereby suppressing the downward flow of the broth. Since the first return 52D is formed over the entire width direction (W) of the lead-in portion 52A, the first soup pool 52E is also provided over the entire width direction (W) of the lead-in portion 52A.
The second return 52F is provided with a second juice pool 52G that is recessed downward at the other end of the lead-in portion 52A in the horizontal direction (H). The second return 52F is formed so as to project diagonally upward from the insertion portion 52A so as to form the second juice pool 52G. The simmered broth that has flowed to the second return 52F is accumulated in the second broth pool 52G, thereby suppressing the simmering from flowing downward. Since the second barb 52F is formed over the entire width direction (W) of the lead-in portion 52A, the second juice pool 52G is also provided over the entire width direction (W) of the lead-in portion 52A.

As shown in FIG. 10, the bending tube 152 has a housing portion constituting the detection unit 60 integrally formed of a resin material. Specifically, it is as follows.
The magnet housing 176 corresponding to the magnet housing 76 accommodating the magnetic field generator 69 in the first embodiment and the element housing 177 corresponding to the element housing 77 accommodating the magnetic field detector 71 in the first embodiment , Formed integrally. The magnet housing 176 and the element housing 177 are connected by a connecting piece 178 having an arcuate appearance. The magnet housing 176, the element housing 177, and the connection piece 178 are integrally manufactured, for example, by injection molding.
The connection piece 178 has elasticity, and by fitting it on the outer periphery of the drawer portion 52B, the magnet housing 176 and the element housing 177 are fixed to the drawer portion 52B. An adhesive may be used to fix the connection piece 178 to the drawer portion 52B.

The magnet housing 176 is provided with a rectangular parallelepiped void inside, and the magnetic field generator 69 is housed inside the void. The magnet housing 176 shows an example in which the magnetic field generator 69 is housed in this gap without a gap.
As an example, the element housing 177 is provided between a pair of side walls 177A and 177B provided at intervals in the width direction (W) and between the side wall 177A and the side wall 177B, and is provided on one end side of the length direction L. It is provided with a partition wall 177C to be provided. At the other end of the element housing 177 in the length direction L, a side wall 177D connecting the side wall 177A and the side wall 177B is provided. There is a considerable distance between the partition wall 177C and the side wall 177D.

[Action / effect of temperature sensor 2 (second embodiment)]
The temperature sensor 2 has the following effects.
In the temperature sensor 2, the bent pipe 152 is composed of a combination of the first pipe member 152A and the second pipe member 152B. Then, an accommodating hole 152C is formed straddling the combined first pipe member 152A and the second pipe member 152B, and the flange 51E of the straight pipe 151 is inserted into the accommodating hole 152C. As a result, the straight pipe 151 and the bent pipe 152 are securely joined to each other in a state of being prevented from coming off.

Further, in the temperature sensor 2, the first return 52D and the second return 52F are provided in the lead-in portion 52A. As a result, according to the temperature sensor 2, it is possible to prevent the spilled broth from falling downward.

Further, in the temperature sensor 2, the magnet housing 176 and the element housing 177 constituting the detection unit 60 are integrally configured via the connection piece 178. As a result, the cost as a member can be suppressed as compared with the case where the magnet housing 176 and the element housing 177 are separated. Further, since the magnet housing 176 and the element housing 177 can be integrally attached to the drawer portion 52B, the manufacturing cost can be suppressed.

[Third Embodiment]
Next, the temperature sensor 3 according to the third embodiment of the present invention will be described with reference to FIGS. 11 and 12. Regarding the parts common to the temperature sensor 2 according to the second embodiment, the same reference numerals as those of the temperature sensor 2 are attached to FIGS. 11 and 12, and the description thereof will be omitted.

As shown in FIG. 11, the temperature sensor 3 omits the magnetic shield 61 of the detection unit 60 included in the temperature sensor 2, and the magnetic field detector 71 is provided inside the extraction unit 52B. Further, in the temperature sensor 3, a magnet housing 276 in which the magnetic field generator 69 is housed is integrally formed with the drawer portion 52B. The differences between the temperature sensor 3 and the temperature sensor 2 including these two characteristic differences will be described below.

[Detector 160]
The detection unit 160 includes a magnetic field generator 69 that generates a magnetic field, and a magnetic field detector 71 that detects a magnetic field from the magnetic field generator 69.

[Connection relationship between the magnetic field detector 71 and the connecting lines 30A and 30B]
In the temperature sensor 3, the lead wires 75A and 75B of the magnetic field detector 71 are electrically connected to a pair of ferromagnetic leads of the detection element 73 at one end thereof, and the other ends are electrically connected to the joint wires 30A and 30B. Is connected. Therefore, between the connecting wire 30A and the connecting wire 30B, an electrical path including the lead wire 75A, the detection element 73, and the connecting wire 75B is configured so as to straddle the connecting wire 30A and the connecting wire 30B. In the electrical path related to the magnetic field detection (hereinafter referred to as the magnetic field detection path), the electrical path related to the temperature detection (hereinafter referred to as the temperature detection path) including the connecting line 30A, the heat sensitive element 10 and the connecting line 30B is electrically connected. The magnetic field detector 71 includes a detection element 73 and an element housing 77 that houses a pair of lead wires 75A and 75B inside. These elements are housed inside the protective tube 50. The detection element 73 is sandwiched between the joint lines 30A and 30B, and is supported in the horizontal direction (H) by the joint lines 30A and 30B.

Next, the element housing 77 reciprocates in the horizontal direction (H) inside the protective tube 50 with the detection element 73 and the lead wires 75A and 75B housed therein. This movement of the element housing 77 occurs in the temperature sensor 3 when the cooking container 107 is removed from the trivet 106 and when the cooking container 107 is placed on the trivet 106.
The element housing 77 is slidably held by the protective tube 50 inside the protective tube 50 and in a predetermined region in the vertical direction (V). The element housing 77 performs a reciprocating motion accompanied by this sliding while accommodating the detection element 73 and the lead wires 75A and 75B.
Inside the element housing 77, the joint line 30A and the joint line 30B are arranged so as to sandwich the detection element 73. The connecting wire 30A and the lead wire 75A are connected by the connection terminal 79A above the vertical direction (V), and the connecting wire 30B and the lead wire 75B are connected by the connecting terminal 79B below the vertical direction (V). The respective connection terminals 79A and 79B are pressed against the inner wall surface of the corresponding element housing 77. Further, although not shown in the drawing of FIG. 11, the connecting lines 30A and 30B sandwiching the detection element 73 may also be pressed against the inner wall surface of the corresponding element housing 77. As described above, the connecting wires 30A and 30B, the detection element 73, and the lead wires 75A and 75B are supported inside the element housing 77, and the element housing 77 and the detection element 73 and the like contained therein are not included. Move back and forth in synchronization.

FIG. 11A shows the position of the magnetic field detector 71 when the movable body 41 remains in the non-mounted position. At this time, the detection element 73 of the magnetic field detector 71 faces the magnetic field generator 69 of the magnetic field generator 69 and is located in the magnetic field from the magnetic field generator 69. Hereinafter, the position of the magnetic field detector 71 at this time is referred to as a magnetic field irradiation position.
When the magnetic field detector 71 is in the magnetic field irradiation position, the detection element 73 receives the magnetic field from the magnetic field generator 69, so that the magnetic circuit is closed (ON). At this time, in addition to the temperature detection path composed of the connecting wire 30A, the heat sensitive element 10 and the connecting wire 30B, the connecting wire 30A and the connecting wire 30B are the lead wire 75A, the detection element 73 and the lead wire 75B, that is, the magnetic field detection. It is electrically connected by a magnetic field detection circuit consisting of a device 71.

FIG. 11B shows the position of the magnetic field detector 71 when the movable body 41 remains in the mounting position. The position of the magnetic field detector 71 at this time is referred to as a magnetic field non-irradiation position.
At this time, the detection element 73 of the magnetic field detector 71 has moved to a position separated from the magnetic field generator 69 in the horizontal direction (H), and the detection element 73 is located outside the range of the magnetic field generated from the magnetic field generator 69. Therefore, the detection element 73 has a magnetic circuit open (OFF). Therefore, the electrical connection between the joint wire 30A and the joint wire 30B is broken by the magnetic field detector 71.

Whether or not the cooking container 107 is mounted is detected and determined based on the presence or absence of an electrical connection between the connecting wire 30A and the connecting wire 30B by the magnetic field detector 71 as follows.
As shown in FIG. 12A, when the magnetic field detector 71 is in the magnetic field irradiation position, the joint line 30A and the joint line 30B are electrically connected by the magnetic field detector 71. It is assumed that the inspection current is supplied from the detector (not shown) to the junction line 30A, and the inspection current from the junction wire 30B through the heat sensitive element 10 is received by the detector. However, since the junction line 30A and the junction line 30B are electrically connected by the magnetic field detector 71, a short circuit occurs between the junction line 30A and the junction line 30B. Therefore, the detector cannot receive the inspection current that has passed through the heat sensitive element 10. As a result, the detector can detect and determine that the movable body 41 remains in the non-mounting position, that is, the cooking container 107 is not mounted.
On the other hand, as shown in FIG. 12B, when the magnetic field detector 71 is in the magnetic field non-irradiation position, the detection element 73 is open (OFF), so that the inspection current supplied to the junction line 30A is the heat sensitive element. The inspection current that has passed through 10 is received from the junction line 30B by the detector. Thereby, the detector can detect and determine that the cooking container 107 is placed in addition to the temperature of the cooking container 107.

[Action / effect of temperature sensor 3]
The temperature sensor 3 has the following effects.
The temperature sensor 3 adopts a configuration in which the detection element 73 does not receive the magnetic field from the magnetic field generator 69 by moving away from the region where the magnetic field from the magnetic field generator 69 does not reach at the magnetic field non-irradiation position. That is, according to the temperature sensor 3, it is not affected by the deterioration of the characteristics of the soft magnetic material that may occur when the magnetic shield 61 made of the soft magnetic material is used to avoid the magnetic field from the magnetic field generator 69. Thereby, according to the temperature sensor 1, the determination regarding the presence / absence of the cooking container 107 can be guaranteed for a long period of time.

Since the temperature sensor 1 does not use the magnetic shield 61 that has been used because it is not affected by the magnetic field from the magnetic field generator 69, the number of components as a magnetic field detector can be reduced. As a result, the cost of the temperature sensor 3 can be reduced.
In particular, the temperature sensor 3 detects and determines the presence or absence of the cooking container 107 by receiving an inspection current with a detector connected to the temperature detection path by providing a magnetic field detector 71 straddling the joint line 30A and the joint line 30B. And temperature detection by the heat sensitive element 10 can be achieved at the same time.

[Fourth Embodiment]
Next, the temperature sensor 4 according to the fourth embodiment of the present invention will be described with reference to FIGS. 13 and 14. Regarding the parts common to the temperature sensor 3 according to the third embodiment, the same reference numerals as those of the temperature sensor 3 are attached to FIGS. 13 and 14, and the description thereof will be omitted.

In the temperature sensor 4, as shown in FIG. 13, the drawer portion 152B of the temperature sensor 3 has a first drawer portion 152B1 made of a resin material and a second metal drawer portion 152B2 connected to the first drawer portion 152B1. , Consists of. Further, the magnetic field detector 71 in the temperature sensor 4 is connected in series with the connecting wire 30A.

As shown in FIG. 13, the bent pipe 52 is composed of a straight metal pipe 151, a first drawer portion 152B1 made of a resin material, and a second drawer portion 152B2 made of metal. Similar to the straight pipe 151, the second drawer portion 152B2 is provided with the flange 51E to improve the connection strength with the first drawer portion 152B1.

The magnetic field detector 71 of the temperature sensor 3 connected the lead wire 75A and the connecting wire 30A, and connected the lead wire 75B and the connecting wire 30A, but the temperature sensor 4 connected the lead wires 75A and 75B as shown in FIG. Are both connected in series to one of the connecting wires 30A. This means that the lead wire 75A, the detection element 73, and the lead wire 75B are interposed in the middle of the joint wire 30A, and the magnetic field detector 71 is not involved in the joint wire 30B.

The operation of the magnetic field detector 171 according to the temperature sensor 4 shown in FIG. 14 will be described.
As shown in FIG. 14A, in a state where the cooking container 107 is not placed, the detection element 73 is separated from the magnetic field generator 69 in the horizontal direction (H), and the detection element 73 is from the magnetic field generator 69. It is located in a region that is out of the reach of magnetic fields. That is, in the temperature sensor 4, the detection element 73 is placed in the magnetic field non-irradiation position in the state where the cooking container 107 is not placed.
Next, as shown in FIG. 14B, the detection element 73 is located in the region covered by the magnetic field from the magnetic field generator 69 of the magnetic field generator 69 in the state where the cooking container 107 is placed. That is, in the modified example, the detection element 73 is placed at the magnetic field irradiation position while the cooking container 107 is placed.

As described above, the temperature sensor 4 has a correspondence relationship between whether or not the cooking container 107 is placed and whether or not the detection element 73 receives a magnetic field, which is the opposite of that of the temperature sensor 3 described above. If the cooking container 107 is not placed on the temperature sensor 4 (FIG. 14 (a)), the detection element 73 is closed (ON), so that a short circuit occurs between the joint wire 30A and the joint wire 30B for cooking. The absence of the container 107 can be detected and determined. Further, in the temperature sensor 4, if the cooking container 107 is placed (FIG. 14 (b)), the detection element 73 is open (ON), so that the temperature sensor 4 is via the joint wire 30A, the heat sensitive element 10 and the joint wire 30B. The detector receives the inspection current. This makes it possible to detect and determine the presence of the cooking container 107 in addition to the temperature detection.

Here, the magnetic field generator 69 is housed in a magnet housing 276 integrally formed with the drawer portion 152B1. The horizontal (H) dimension of the magnet housing 276 is set to be larger than the horizontal (H) dimension of the magnetic field generator 69. This is to shift the position of the magnetic field generator 69 in the magnet housing 276 in the horizontal direction (H) so that the positional relationship with the detection element 73 can be adjusted.

[Action / effect of temperature sensor 4 (fourth embodiment)]
The temperature sensor 4 has the same effect as that of the temperature sensor 3, and also has the following effects.
The temperature sensor 4 has an inverse relationship with the temperature sensor 3, for example, whether or not the cooking container 107 is placed and whether or not the detection element 73 receives a magnetic field. Since the detection element 73 is connected in series with the connecting wire 30A in the temperature sensor 4, the electric resistance value of the detection element 73 is added to the electric resistance value of the heat sensitive element 10. Therefore, when the temperature sensor 4 detects the temperature, it is necessary to correct the electric resistance value of the detection element 73. On the other hand, the temperature sensor 3 described above has an advantage that it is not necessary to make such a correction. On the other hand, the temperature sensor 4 has an advantage that it is easy to manufacture because it does not need to be processed into another joint wire 30B.

In addition to the above, as long as the gist of the present invention is not deviated, the configurations listed in the above embodiments can be selected or changed to other configurations as appropriate.

[Constituent material of protective tube 50]
In the above, the example in which the straight tube 51 is made of a metal material has been described, but the present invention includes a form in which the straight tube 51 is made of a resin material. That is, the present invention includes a form in which one or both of the straight pipe 51 and the bent pipe 52 is made of a resin material.
Further, the present invention includes a form in which, when the bent pipe 52 includes a pull-in portion 52A and a pull-out portion 52B, one or both of the pull-in portion 52A and the pull-out portion 52B are made of a resin material.

[Structure of detection unit 60]
The temperature sensor 1 according to the present embodiment exemplifies a reed switch as the detection element 73 of the magnetic field detector 71, but the present invention is not limited to this, and other porcelain detection means such as a coil, a Hall element, and a magnetoresistive element. Can be used.
When the magnetic field passing through the coil changes, a voltage due to electromagnetic induction is generated, and the coil detects magnetism by detecting this voltage.
Further, in the Hall element, when a current is passed through a semiconductor thin film or the like, a voltage corresponding to the magnetic field density and the direction is generated by the Hall effect, and magnetism is detected by detecting this voltage.
The magnetoresistive element is composed of a material whose electric resistance changes when a magnetic field is applied, and detects the magnetic field by detecting the fluctuation of the electric resistance.
In addition to the above, a magnetic impedance element, a superconducting quantum interference element, or the like can be used. Further, the 73 may be configured by another detection method, for example, a method of detecting light, which is not limited to magnetism.

[Application of temperature sensor 1]
Further, the gas stove 100 shown as an application of the temperature sensor 1 is merely an example of the present invention, and can be widely applied to an apparatus for measuring a temperature in contact with an object to be heated. For example, an electromagnetic cooking container, an electric rice cooker, a pot, a coffee maker, and the like can be mentioned.
An example applied to the electric rice cooker 200 is shown in FIG. The electric rice cooker 200 has a double-structured housing 201 that is configured to accommodate the rice cooker 203 for cooking rice and has a space 204, and a lid that covers the upper opening of the housing 201 so as to be openable and closable. It has a body 202 and.
The housing 201 is composed of an outer case 205 made of an integrally molded synthetic resin, a bottomed tubular protective frame 206 made of synthetic resin, and a dish-shaped bottom case 207 made of synthetic resin constituting the bottom wall. Has been done.
A temperature sensor 1 for measuring the temperature of the rice bowl is held in the sensor holding hole 208 in the central portion of the bottom surface of the protective frame 206.

Further, the structures of the temperature sensors 1 to 4 are merely an example of the present invention, and are widely applied to temperature sensors including a movable body that reciprocates with respect to a fixed body. As the materials of the members constituting the fixed body and the movable body, materials other than those shown in the embodiments can be used. For example, for a member using a metal material, a molded product made of resin can be used if the measurement temperature is low.

1, 2, 3, 4 Temperature sensor 10 Heat sensitive element 11 Heat sensitive body 12 Electrode 13 Lead wire 14 Core wire 15 Insulation coating 16 Protective layer 30, 30A, 30B Connection wire 31 Core wire 33 Insulation coating 40 Sensor holder 41 Movable body 42 Heat collecting Body 42A Contact surface 42B Back 43 Storage cylinder 43A Upper end 43B Lower end 44 Holder 44A Upper end 44B Lower end 44C Step 44E Opening 45 Protective tube 45A Upper end 45B Void 45C Lower end 46 Coil spring 46A Upper end 46B Lower end 47 Insulation tube 50 Protective tube 51 Straight tube 51A Upper end 51B Lower end 51C Fixed end 51D Passage 51E Flange 52 Bending tube 52A Inlet 52A1 Fitting hole 52A3 Release groove 52B Drawer 52B1 Main hole 52B3 Sub hole 52C Fixed piece 52C1 Insertion 52C3 Locking body 52C5 Sealing part 52E Flange 54 Seating element 56 Tube wall 59 Bending part 60 Detection part 61 Magnetic shield 63 Shield 65 Holder 67 Connection piece 69 Magnetic field generator 71 Magnetic field detector 73 Detection element 75A, 75B Lead wire 76 Magnet housing 77 Element housing 79A, 79B Connection terminal 100 Gas stove 106 Gotoku 107 Cooking container 108 Bottom surface 151 Straight tube 152 Bending tube 152A First tube member 152B Second tube member 152B1 First drawer 152B2 Second drawer 152C Accommodation hole 160 Detection Part 171 Magnetic field detector 176 Magnet housing 177 Element housing 177A, 177B, 177D Side wall 177C Partition wall 177E Bottom wall 178 Connection piece 200 Electric rice cooker 201 Housing 202 Lid 203 Rice bowl 204 Space part 205 Outer case 206 Protective frame 207 Bottom case 208 Sensor holding hole 276 Magnet housing

Claims (9)

A temperature sensor for detecting the presence or absence of a measurement target and the temperature.
A heat-sensitive unit including a heat-sensitive body that detects the temperature of the measurement target and a pair of electric wires that are electrically connected to the heat-sensitive body.
A detection unit that detects the presence or absence of the measurement target according to the movement of the heat-sensitive unit, and a detection unit.
A protective tube through which the pair of the electric wires is inserted is provided.
The protective tube is
A straight pipe into which the electric wire is drawn, and
A bent pipe from which the electric wire is drawn, which includes a bent portion and is connected to the straight pipe, is provided.
At least the bent portion is made of a resin material .
The bent pipe is
A pull-in portion connected to the straight tube, a pull-out portion connected to the lead-in portion via the bend portion, and integrally formed with the lead-in portion by the resin material.
It is provided with a fixing piece that is assembled at the intersection of the pull-in portion and the drawer portion, is involved in the connection between the straight pipe, the lead-in portion, and the drawer portion, and positions the straight pipe. A temperature sensor featuring.
A temperature sensor for detecting the presence or absence of a measurement target and the temperature.
A heat-sensitive unit including a heat-sensitive body that detects the temperature of the measurement target and a pair of electric wires that are electrically connected to the heat-sensitive body.
A detection unit that detects the presence or absence of the measurement target according to the movement of the heat-sensitive unit, and a detection unit.
A protective tube through which the pair of the electric wires is inserted is provided.
The protective tube is
A straight pipe into which the electric wire is drawn, and
A bent pipe from which the electric wire is drawn, which includes a bent portion and is connected to the straight pipe, is provided.
At least the bent portion is made of a resin material .
The bent pipe is
A pull-in portion connected to the straight pipe and a pull-out portion connected to the lead-in portion via the bend portion are provided.
The inlet portion is a temperature sensor characterized by having a soup pool that is recessed so that the flowing broth can be collected .
The bent pipe is
One or both of the lead-in portion and the drawer portion are made of the resin material.
The temperature sensor according to claim 2 .
The bent pipe is
The inlet portion and the drawer portion that are integrally configured,
The straight tube is provided with a fixing piece involved in the connection between the lead-in portion and the drawer portion.
The temperature sensor according to claim 2 or 3.
The bent pipe is
The first pipe member and the second pipe member, which are symmetrical to each other in the width direction, are provided.
The straight tube is
A locking piece that is locked across the first pipe member and the second pipe member.
The temperature sensor according to claim 3.
The lead-in portion is made of the resin material and is composed of the resin material.
The drawer is made of a metal material.
The temperature sensor according to claim 2 .
The straight tube is made of a metal material.
The temperature sensor according to claim 1 or 2.
The detector is
A magnetic field generator that generates a magnetic field with respect to the surroundings,
A magnetic field detection element that reciprocates between a region covered by the magnetic field and a region not covered by the magnetic field from the magnetic field generator is provided.
The magnetic field detection element is
Connected across a pair of the wires, or connected in series with one of the pair of wires.
The temperature sensor according to any one of claims 1 to 6.
A cooking device equipped with a temperature sensor for detecting the presence or absence of a measurement target and the temperature.
The temperature sensor is the temperature sensor according to any one of claims 1 to 8.
Cooking equipment that features that.

Images