CN1133435A

CN1133435A - Heat sensor

Info

Publication number: CN1133435A
Application number: CN 95120430
Authority: CN
Inventors: 竹内通一; 野原洋
Original assignee: TDK Corp
Current assignee: TDK Corp
Priority date: 1994-12-14
Filing date: 1995-12-14
Publication date: 1996-10-16

Abstract

The invention relates to a thermal device; wherein, a metal cap is a cylinder with a top plate. The outer surface of the top plate forms a thermal surface. A thermal detecting device is arranged in the metal cap and is thermally coupled with the inside of the top plate with a non-adhesive state. The thermal detecting device is pressed and connected on the inside of the metal cap under the elastic pressure action of a spring piece. The invention can prevent thermal measuring errors caused by the heat expansion and contraction of the metal cap and can also prevent the performance of a thermosensor from going bad caused by soup or oil overflowing, etc.

Description

Heat sensor

The invention relates to heat sensor.

Open flat 4-115131 from the spy, open in fact flat the grade for 5-No. 92666 in the communiques as can be known, in burner such as gas stove or meal pot, the heat sensor that detects heating object temperature such as pot is arranged, be that thermal sensing element is fixedly mounted on the carriage of thermometric face in disclosed heat sensor of these prior art documents or the temperature-detecting device, one of problem that is produced when adopting this spline structure is that the heat that heated object spreads out of when making temperature detection makes carriage produce thermal expansion, cause the thermal coupling between carriage and the thermal sensing element to change and generation heat detection error, heated object cooling back causes that again the mechanical connection between carriage and the thermal sensing element changes owing to cause the thermal shrinkage of carriage.This heat expansion and shrinkage and since carry out at every turn such heating with stop to heat action repeatedly the time all can take place, can make heat detect error and become big along with each increase of access times.

In addition, mostly the common user mode of heat sensor be to carry out in the atmosphere that contains objectionable impuritiess such as moisture and chlorine, and when using in this atmosphere gas, importantly provide a kind of high heat sensor of reliability that is not subjected to this atmosphere gases affect.By above-mentioned prior art is to be difficult to obtain the high heat sensor of this reliability.

And then, as its concrete use-pattern, when if this heat sensor is the temperature that is used to detect by the heated objects such as pot of burners such as gas stove heating, the soup or the oil that overflow boiling from pot also can make heat sensor become bad, soup that overflows from pot or wet goods can be by the minim gaps that exists in the heat sensor, invade the carriage inside of containing thermal sensing element owing to capillary action etc., make the sensible heat element become bad.In above-mentioned prior art file, do not consider that thermal sensing element overflows the problem that becomes bad because of soup and wet goods, does not disclose it yet and does not prevent measure.

Task of the present invention provides a kind of can preventing and produces the heat sensor that heat detects error because of heat expansion, shrinkage.

Another object of the present invention provides a kind of thermal sensing element that can prevent reliably and overflows the heat sensor that becomes bad because of soup or wet goods.

To achieve these goals, heat sensor of the present invention includes exterior body, heat detecting device and hold down gag.On the above-mentioned exterior body metal cap is arranged, above-mentioned metal cap becomes the tubular that top board is arranged, and the outside of above-mentioned top board forms the sensible heat face.

It is that the inside with non-bonding way and above-mentioned top board reaches thermal coupling that above-mentioned heat detecting device is configured within the above-mentioned metal cap.

Above-mentioned hold down gag has a spring leaf at least, by the elastic pressure of this spring leaf above-mentioned heat detecting device is crimped on the inside of above-mentioned metal cap.

So, the metal cap that exterior body comprised, its top board outside constitutes sensible heat face, and heat detecting device is configured in the metal cap and becomes the thermal coupling state with the inside of top board, reach heat detecting device from the heat that is reached on the metal cap by the sensible heat body by metal cap, detected with heat detecting device.

Metal cap becomes the tubular that top board is arranged, and heat detecting device is configured in the metal cap.Utilize this structure, around heat detecting device, form the restraining barrier that top board and barrel by metal cap form.The opening of metal cap is in the downside position relative with top board.Like this, though from the sensible heat face by the sensible heat body, when soup or wet goods for example taking place in the pot overflowing, soup or wet goods also are minimum attached to the probability on the heat detecting device.

And, in heat sensor of the present invention, contain hold down gag, have a spring leaf in the hold down gag at least, heat detecting device is crimped on the inside of metal cap, realize reliable thermal coupling between heat detecting device and the metal cap so can make by means of the elastic pressure of spring leaf.

And then, because heat detecting device is to be attached on the inside of top board with non-adhering state,, or cooled off and under the situation that metal cap shrinks the influence that heat detecting device also can not be expanded with heat and contract with cold by metal cap even just make soup when metal cap is subjected to be expanded by the heat effect of sensible heat body by the sensible heat body.And, owing to heat detecting device is that elastic force by means of spring leaf is crimped on the inside of metal cap, when metal cap thermal expansion or contraction, though metal cap is along with these thermal expansions and contraction and have flexible, the elasticity of the spring leaf of hold down gag also can absorb it, thereby heat detecting device be not subjected to the thermal expansion of metal cap and contraction influence and can be stably and the metal cap thermal coupling, thereby just can prevent that the heat that produces because of expanding with heat and contract with cold from detecting error.

Below, with reference to accompanying drawing further feature of the present invention and advantage are described more at large.

Fig. 1 is the phantom view of heat sensor of the present invention;

Fig. 2 is the local amplification view of heat sensor part structure assembly in the presentation graphs 1;

Fig. 3 is the local amplification view of the assembly of heat sensor part-structure of the present invention in the presentation graphs 1;

Fig. 4 is the backplan of Fig. 2 and assembly shown in Figure 3;

Fig. 5 is A5 among Fig. 4-A5 cut-open view;

Fig. 6 represents the user mode of heat sensor of the present invention;

Fig. 7 is the partial sectional view of the other embodiment of heat sensor of the present invention;

Fig. 8 is the backplan of heat sensor shown in Figure 7;

Fig. 9 is that partial sectional view is looked on the left side of heat sensor shown in Figure 7;

Figure 10 is the cut-open view along Fig. 7 A10-A10 line;

Figure 11 is the backplan of another embodiment of heat sensor of the present invention;

Figure 12 is the cut-open view along A12 among Figure 11-A12 line;

Figure 13 is the cut-open view along A13 among Figure 11-A13 line;

Figure 14 is the cut-open view along A14 among Figure 11-A14 line;

Figure 15 represents another embodiment of heat sensor of the present invention, is the variant embodiment of embodiment shown in Figure 11-Figure 14.

Figure 16 is the cut-open view of the other embodiment of expression heat sensor of the present invention;

Figure 17 represents the user mode of the normal configuration of heat sensor among Figure 16;

Figure 18 represents the user mode of the tilted configuration of heat sensor among Figure 16;

Figure 19 is the cut-open view of the another embodiment of expression heat sensor of the present invention;

Figure 20 represents the normal configuration user mode of heat sensor shown in Figure 19;

Figure 21 represents the configuration user mode figure of the inclination of heat sensor shown in Figure 19;

Figure 22 is the expression heat sensor of the present invention cut-open view of an embodiment again;

Figure 23 represents the normal configuration user mode of heat sensor shown in Figure 22;

Figure 24 represents the tilted configuration user mode of heat sensor shown in Figure 22;

Figure 25 is the partial sectional view of the another embodiment of expression heat sensor of the present invention;

Figure 26 is the local amplification view that heat sensor partly constitutes assembly among Figure 25;

Figure 27 is the local amplification view of heat sensor part-structure assembly of the present invention shown in Figure 25;

Figure 28 represents the user mode of Figure 25-heat sensor shown in Figure 27;

Figure 29 is the partial sectional view of an embodiment again of expression heat sensor of the present invention;

Figure 30 is the amplification backplan of the part-structure assembly of heat sensor among expression Figure 29;

Figure 31 is the cut-open view along A31 among Figure 30-A31 line;

Figure 32 is the expression heat sensor of the present invention partial sectional view of an embodiment again; And Figure 33 is that exploded perspective view is amplified in the part of heat sensor shown in Figure 32.

With reference to Fig. 1-Fig. 5 as seen, heat sensor of the present invention comprises exterior body 1, heat detecting device 2 and hold down gag 3.Metal cap 11 is arranged on the exterior body 1.Metal cap 11 is the barrels 112 that form continuous tubular around top board 111, and constitutes the sensible heat face with the outside 113 of its end face 111.Metal cap 11 is by for example copper, and sheet metals such as brass, phosphor bronze or stainless steel constitute.The surface of metal cap 11 by nickel plating etc. to improve its thermotolerance.

The structure of heat detecting device 2 is clearly shown that in Fig. 3 and Fig. 5 especially.With reference to these figure, heat detecting device 2 contains thermal sensing element 21 and insulation shell 22, and is configured within the metal cap 11, and thermal sensing element 21 is contained in thermal coupling with it in the insulation shell 22.Thermal sensing element 21 is plectane or gusset shape, is configured in the inner space 221 of insulation shell 22, with the inside 223 thermal couplings of sidewall 222.

Then, hold down gag 3 fixed installations are located on the inner face 114 of metal cap 11.Fixing means can adopt modes such as for example spot welding, device for fastening 3 has two

spring leafs

31,32, elastic pressure by

spring leaf

31,32 is crimped on insulation shell 22 on the inside 114 of

metal cap

11,22 of insulation shells receive the elastic pressure effect of

spring leaf

31,32, keep becoming the thermal coupling state with the inside 114 of metal cap 11 with non-adhering state.

In the embodiment of Fig. 1-Fig. 5, its exterior body 1 also has first cylindrical shell, 12, the second cylindrical shells 13 and volute spring 14.An axial end of first cylindrical shell 12 embeds and is fixed in the peristome of metal cap 11, an axial end of second cylindrical shell 13 inserts the axial other end of first cylindrical shell 12 loosely, allow therefrom and 12 of first cylindrical shells have relatively moving of Y1 vertically or Y2 (referring to Fig. 1), volute spring 14 is disposed between metal cap 11 and first cylindrical shell 12 and second cylindrical shell 13.

Trip gear 15 is prevented in formation between first cylindrical shell 12 and second cylindrical shell 13, anti-trip gear 15 can stop the metal cap 11 and first cylindrical shell 12 to be deviate from second cylindrical shell 13 because of the elastic pressure of volute spring 14 by this.Anti-trip gear 15 shown in the figure is that the center section of first cylindrical shell 12 is shunk and formation narrow 121, making the first half of second cylindrical shell 13 become the large-diameter portion 31 slightly littler than the internal diameter of first cylindrical shell 12 simultaneously becomes the minor diameter part 132 slightly littler than the internal diameter of narrow 121 with making its Lower Half, and accepts by the large-diameter portion 131 of second cylindrical shell 13 and the step that difference generated of the diameter between the minor diameter part 132 by narrow 121 and to constitute.

Fig. 6 shows the user mode of heat sensor of the present invention, and pot etc. on sensible heat face 113, are put into soup or wet goods by sensible heat body 4 mountings in by sensible heat body 4.Second cylindrical shell 13, its axial end inserts in the axial other end of first cylindrical shell 12 loosely, allowing therefrom has relatively moving of axial Y1 or Y2 direction between itself and first cylindrical shell 12, volute spring 14 is disposed between metal cap 11 and first cylindrical shell 12 and second cylindrical shell 13, by means of this structure, when by sensible heat body 4 mountings on the sensible heat face of metal cap 11 time, the metal cap 11 and first cylindrical shell 12 with regard to the elastic force of dipscrews spring 14 and vertically Y1 are done relative motion with respect to second cylindrical shell 13, and stop on the position that the spring pressure by the general assembly (TW) of sensible heat body 4 (referring to Fig. 6) and volute spring 14 that comprises soup or wet goods 41 balances each other, relatively move and spring action by this, just can relax the impact when being positioned on the sensible heat face 113 reliably by sensible heat body 4.

By the metal cap 11 that is comprised on dress body 11 outward is that outside 113 with its top board 111 constitutes the sensible heat face, thermal sensing element 21 is accommodated in the insulation shell 22, and insulation shell 22 is pressed on the inside 114 of metal covering 11, heat from the sensible heat face 113 that is passed to metal cap 11 by sensible heat body 4 just passes on the insulation shell 22 by metal cap 11, and is detected by the thermal sensing element 21 that is housed in the insulation shell 22.

Again because metal cap 11 has the continuous barrel 112 around end face 111, heat detecting device 2 is disposed within the metal cap 11, thermal sensing element 21 is housed within the insulation shell 22, so between top board outside 113, form dual restraining barrier as the metal cap 11 of sensible heat face with regard to continuous barrel 112 and insulation shell 22.Even thereby from sensible heat face 113 by sensible heat body 4 for example the pot overflow soup or wet goods 41 situation, soup or wet goods 41 also are minimum attached to the probability on the thermal sensing element in the insulation shell 22 21.

Hold down gag 3 has

spring

31,32, is fixedly mounted on metal cap 11 the insides 114, insulation shell 22 is crimped on the inside 114 of metal cap 11 with the elastic pressure of

spring leaf

31,32, just can make heat detecting device 2 realize thermal couplings with metal cap 11 reliably.

Heat detecting device 2 be with the inside 114 of top board 111 with non-adhering state thermal coupling, even so be subjected to being made metal cap 11 thermal expansions by the heat effect of sensible heat body 4, or made by the cooling of sensible heat body 4 under the occasion of metal cap 11 contractions, heat detecting device 2 can not be subjected to the influence of expanding with heat and contract with cold of metal cap 11 yet.

Yet, owing to be by the elastic pressure of

spring leaf

31,32 heat detecting device 2 to be crimped on the inside of metal cap 11, when the hot swollen shrinkage of metal cap 11, that follows these metal caps 11 that expand with heat and contract with cold flexible is then absorbed by the elasticity of

spring leaf

31,32, so, heat detecting device 2 is stably realized thermal couplings with metal cap 11 with regard to the influence of expanding with heat and contract with cold that is not subjected to metal cap 11, and like this, just can prevent the heat detection error that produces because of expanding with heat and contract with cold.

The thermal sensing element 21 of the heat detecting device 2 shown in the figure is made of posistor.Like this, utilize the good switching characteristic of positive temperature coefficient (PTC), just can save level calibrating circuit and on-off circuit and realize the simple heat sensor of circuit structure, insulation shell 22 has the inner space 221 that holds thermal sensing element 21.Inner space 221 is at a side opening relative with bottom 224, and with lid 23 with its sealing, 224 outsides 225, bottom of insulation shell 22 are connected airtight with the inside 114 of metal cap 11 and are realized thermal coupling.Owing to the open side of cover 23 insulation shell 22 is arranged towards the below, then soup or wet goods 41 just more have been difficult to invade within the insulation shell 22.

Also has pair of

electrodes plate

24,25 in the heat detecting device 2.

Battery lead plate

24,25 contacts with the electrode (not shown) face of the posistor that constitutes thermal sensing element 21, and

battery lead plate

24,25 respectively has its pin two 41,251, and pin two 41,251 is drawn out to the outside the gap between insulation shell 22 and lid 23.Pin two 41,251 is outwards drawn on the outer fix of the center line of heat detecting device 2.

One side of

battery lead plate

24,25 also can be the elastic plate electrode that applies elastic pressure on the thermal sensing element 21 to posistor, insulation shell 22 is to have that the good electric insulating material of thermal conductive resin constitutes,

battery lead plate

24,25 to be made of for example corrosion resistant plate etc. by for example Alundum etc., by methods such as nickel plating its thermotolerance is improved on the

battery lead plate

24,25.

Insulation shell 22 seals with heat-resistant seal material with the gap of lid 23, so just can stop soup or wet goods 41 to be invaded in the insulation shell 22.Pin two 41,251 is connecting heat-resisting lead-in wire 26,27.On the lower end of second cylindrical shell 13, set firmly hold-down arm 28.

Then, make the face 225 that is crimped on metal cap 11 the insides 14 become flat shape.When using such insulation shell 22, just can connect airtight insulation shell 22 on the inside 114 of metal cap 11 by means of the elastic pressure of spring leaf 31,32.Just can between the central part of the posistor in insulation shell 22 21 and metal cap 11, form thermal coupling closely thus.And, under expanding with heat and contract with cold situation, metal cap 11 also can keep stable thermal coupling to its tracking.

Below, explain hold down gag 3.Hold down gag 3 is preferably made with resilient sheet metals such as steel or stainless steels.On the hold down gag 3 shown in the figure framework 33 is arranged, and the inside 114 of metal cap 11 is exposed in the field 34 that framework 33 is crossed, heat detecting device 2 in the field 34 that framework 33 is surrounded with the inside 114 thermal couplings of metal cap 11.Though the framework 31 shown in the figure is to form continuous annular, also can be the dividing body of multi-disc.

The

spring leaf

31,32 and the framework 33 of hold down gag 3 form continuously, and

spring leaf

31,32 is provided with two, respectively are configured in opposite side to clamp heat detecting device 2, and framework 33 is useful to prevent the projection 351-354 of heat detecting device 2 position deflections.

Below, the other embodiment with reference to Fig. 7-Figure 15 illustrates heat sensor of the present invention among these figure, uses the part of representing to have same structure with the same sequence number of Fig. 1-Fig. 6.

Fig. 7 is the front portion cut-open view of heat sensor of the present invention, and Fig. 8 is the backplan of heat sensor shown in Figure 7, and Fig. 9 is a heat sensor left surface phantom view shown in Figure 7, and Figure 10 is the cut-open view along A10 among Fig. 7-A10 line.

In this embodiment, insulation shell 22 has the inner space 221 that holds thermal sensing element 21, inner space 221 is at a side opening relative with bottom 224, and with cover 23 with closure of openings, the outside 225 of the bottom 224 of insulation shell 22 and the inside 114 of metal cap 11 are connected airtight and realized thermal coupling.The posistor that constitutes thermal sensing element 21 is discoideus or the gusset shape, and is configured within the inner space 221 of insulation shell 22 and forms thermal couplings with bottom 224.Thereby, be set in the sensible heat face 113 of bottom on 224 outsides 225 with and the thermal sensing element 21 of the inside formation thermal coupling of bottom 224 between only insert the thickness of slab of a bottom 224.Therefore, from sensible heat face 113 to thermal sensing element 21 can be efficiently, conduct heat at high speed.

Figure 11 is the backplan of heat sensor of the present invention, Figure 12 is the cut-open view along A12 among Figure 11-A12 line, Figure 13 is the cut-open view along A13 among Figure 11-A13 line, Figure 14 is the cut-open view along A14 among Figure 11-A14 line, insulation shell 22 in this embodiment, its surface 225 that is crimped on the inside 114 of metal cap 11 becomes mild spherical convex surface, when using this insulation shell 22, because

spring leaf

31,32 elastic pressure, make the inside 114 of metal cap 11 on spherical 225 of insulation shell 22, produce additional deformation, and insulation shell 22 is connected airtight on the inside 114 of metal cap 11.Like this, even under the occasion that produces distortion on the top board 111 of metal cap 11, between the central part of the posistor within the insulation shell 22 21 and metal cap 11, also can form thermal coupling closely.And, under the situation that metal cap 11 expands with heat and contract with cold, also can follow it and keep stable thermal coupling.

The inner space 221 that holds thermal sensing element 21 is arranged in the insulation shell 22.Inner space 221 is at a side opening relative with bottom 224, and with lid 23 with closure of openings.The outside 225 of the bottom 224 of insulation shell 22 is connected airtight on the inside 114 of metal cap 11 and is realized thermal coupling.The posistor that constitutes thermal sensing element 21 is discoideus or the gusset shape, be configured in the inner space 221 of insulation shell 22 and with the inside thermal coupling of bottom 224, for making the inside thermal coupling of thermal sensing element 21 and bottom 224, the thickness of slab of a bottom 224, interval between sensible heat face 113 bottom being set on 224 outsides and the thermal sensing element 21, therefore, heat just can efficiently and promptly pass on the thermal element 21 from sensible heat face 113.

Battery lead plate

24,25 has pin two 41,251, pin two 41,251 respectively be located at insulation shell 22 medial surfaces on ditch portion 227 communicate, and leave between the side of posistor 21 at interval and be drawn out to outside the insulation shell 22.So just can guarantee between heteropole the insulation distance between distance and hold down gag 3 and the pin two 41,251,

battery lead plate

24,25 is correctly located in ditch portion 227.

Hold down gag 3 contains 1 spring leaf 31, and spring leaf 31 is configured in the ditch 226 of transversal lid 23 formation, and two ends compress with compressing tablet 361,362.Compressing tablet the 361, the 362nd bends to the inside from the peripheral part of annular framework 33 and to form.Insulation shell 22 is configured within the punching 34 of the circle that is formed at framework 33 inboards.Framework 33 has the outwards location projection 351,352 of bending of inner peripheral.

Figure 15 represents an embodiment again of heat sensor of the present invention, is the variation that is equivalent to embodiment shown in Figure 11-14.In the present embodiment, the two ends 311,312 of spring leaf 31 are pushed down by the recessed to the inside formed projection 115,116 of the outer peripheral face that makes metal cap 11 and are combined with metal cap 11.

Though not shown in the drawings, also can on the two ends 311,312 of spring leaf 31, be provided with and prevent the projection of rotating.Any one embodiment shown in Fig. 7-15 can constitute assembly shown in Figure 1, thereby can receive and the same action effect that Fig. 1-6 is illustrated.

Figure 16 is the cut-open view of another embodiment of the present invention, and the feature of this embodiment is that the sensible heat face 113 of the top board 111 of formation metal cap 11 is circular-arc.Figure 17 and Figure 18 represent the user mode of the heat sensor of Figure 16, are loaded with pot on the sensible heat face 113 and wait by sensible heat body 4.With the occasion of heeling condition mounting on heating arrangement not, heated object 4 as shown in Figure 17, contacts substantially with in the middle of the sensible heat face 113, and carries out sensible heat therefrom at heated object 4.In the occasion of inclination shown in Figure 180, be circular-arc owing to constitute the sensible heat face 113 of the end face 111 of metal cap 11, heated object 4 still contacts with sensible heat face 113 in the face of sensible heat face 113.Therefore, even heated object 4 is during with respect to sensible heat face 113 tilted configuration, also be unlikely its thermal conductivity of infringement, still can realize sensible heat, when sensible heat face 113 was flat surfaces, with respect to sensible heat face 113 tilted configuration, then heated object 4 just contacted with the bight of metal cap 11 as if heated object, will impair from the heat-conductive characteristic of heated object 4, produce and incur loss through delay heat conducting fault to heat sensor.

Figure 19-Figure 29 represents other example and the user mode thereof corresponding to the sensible heat face 113 of the heated object of tilted configuration, and heat sensor shown in Figure 19 is that the middle body of expression sensible heat face 113 is the plane, and peripheral part is the example on inclined-plane.Use this embodiment heated object 4 so that heeling condition does not place on the heating arrangement, as shown in figure 20, heated object 4 contacts with the tabular surface of the central portion that is located at sensible heat face 113, thereby realizes its sensible heat effect.

When heated object 4 tilts as illustrated in fig. 21, heated object 4 also contacts with the part that the tabular surface that constitutes sensible heat face 113 is connected with the dip plane, the part that tabular surface links to each other with the dip plane is positioned at the inboard of metal cap 11 angles, so, even at heated object 4 during with respect to sensible heat face 113 tilted configuration, also be unlikely to diminish its thermal conductivity, can realize its sensible heat action.

Figure 22-Figure 24 represents the other embodiment and the user mode thereof of the sensible heat face 113 corresponding with heated object 4 tilted configuration.Heat sensor shown in Figure 22 is that the central portion of expression sensible heat face 113 is the plane, peripheral part is the example of arcuation dip plane, use this embodiment when heated object 4 does not place on the heating arrangement obliquely, as shown in figure 23, heated object 4 contacts with tabular surface on the central portion that is located at sensible heat face 113, to realize sensible heat.

When heated object 4 tilts as illustrated in fig. 24, heated object 4 links to each other with circular-arc dip plane with the tabular surface that constitutes sensible heat face 113 and partly contacts, the part that tabular surface links to each other with circular-arc dip plane is positioned at metal cap 11 bights and locates in the inner part, therefore, when even heated object 4 disposes obliquely with respect to sensible heat face 113, also unlikelyly impair heat conduction, thereby realize thermal coupling.

The following describes Figure 25-embodiment shown in Figure 28.Among the embodiment, exterior body 1 also comprises cover 39.Cover 39 is made of electrically insulating material, and transversal metal cap 11 internally disposes, and heat detecting device 2 comprises posistor 21 and pair of terminal 37,38.Posistor 21 has electrode 211,212 respectively, and is configured within the metal cap 11 on relative two sides, electrode 211 contacts with 114 of the insides of metal cap 11 top boards 111.So insulation shell used among the embodiment of Fig. 1-24 is not set in the heat sensor of embodiment.

Terminal 37 forms with cover 39, and double as hold down gag 3, sheet metals such as the stainless or steel of terminal 37 are made, terminal 37 is compressed in the interval between cover 39 and the posistor 21, with with electrode 212 Elastic Contact, and posistor 21 is crimped on the inside 114 of top board 111.Terminal 38 is also made with sheet metals such as stainless steel or steel.Terminal component 38 support by cover 38 and with metal cap 11 conductings, in this embodiment terminal component 38 be configured in and the corresponding step 393 of diameter difference of 392 of the large-diameter portion 391 of cover 39 and minor diameter parts on, and be compressed in metal cap 11 barrel 112 inner face and between the side end face that erects 374 of minor diameter part 392 (referring to Figure 27).

Metal cap 11, the outside of its top board 111 constitutes sensible heat face 113, and at the opposite side opening of top board 111.Metal cap 11 can be made with for example sheet metals such as aluminium, copper, brass, phosphor bronze or stainless steel.As required, can be on the sensible heat face of metal cap 11 nickel plating to improve its thermotolerance.And then also available forging processing mode is made as the means that form required form in the flatness that improves sensible heat face 113.

It is desirable that the electrode 211,212 of posistor 21 forms the resistance contact electrode, and the resistive contact electrode can form by imposing non-electrolytic nickel coating on positive temperature characteristic thermistor surface.Electrode 211,212 can be a sandwich construction as required, and it is the electrode layer of major component that the top layer is become with silver.And then, for the transport phenomena that prevents silver can be located at the silver electrode layer on the nickel dam, and make it littler than nickel electrode area.

Cover 39 is made by electrically insulating materials such as heat resistant plastice or potteries, is separated by interval D at the rear of posistor 21 and is configured within the metal cap 11, thereby close the spatial accommodation 115 of posistor 21.The periphery of cover 39 is supported that by the barrel 112 of metal cap 11 with sealant 51 sealings, illustrated cover 39 has the shape that is arranged on the minor diameter part 392 that is attached thereto on the large-diameter portion 391 between the inner face of periphery and barrel 112.Large-diameter portion 391 is entrenched in the annular stepped portion 116 that forms on the interior perimembranous of metal cap 11, and compresses by the contraction flow region (or teat) 117 that is formed on the metal cap 11.Sealant 51 is attached in the gap between contraction flow region 117 and the large-diameter portion 391, along the whole periphery of large-diameter portion 391 it encapsulated.Sealant 51 can use the used temperature resistant encapsulation agent of known past, and the surface of minor diameter part 392 is as the carrying plane of supported end subassembly 37.

On the inner face 114 of the top board 111 of metal cap 11 recess 118 is arranged.Posistor 21 is disposed within the recess 118, and locatees with this.This structure detects action owing to making posistor 21 be difficult for producing the position deflection in the location easily so can guarantee its stable heat.

And then pair of

terminal parts

37,38 consubstantiality ground form and leaded terminal 241,251, and lead terminal portion 241,251 runs through cover 39 and draws from open side.Use this structure, can reduce solder joint, and can improve thermonasty and thermotolerance.In this structure, preferably lead terminal portion 241,251 is run through part sealant 52 (with reference to Figure 27) sealing of cover 39, so just can stop the sealing property of lead extension to descend.

Exterior body 1 also comprises first cylindrical shell, 12, the second cylindrical shells 13 and volute spring 14.An axial end of first cylindrical shell 12 embeds and is fixed in the peristome of metal cap 11.Second cylindrical shell 13 inserts the axial other end of first cylindrical shell 12 loosely with its axial end, admits of relatively moving of axial Y1 or Y2 direction like this between itself and first cylindrical shell 12.Volute spring 14 is configured between metal cap 11 and first cylindrical shell 12 and second cylindrical shell 13, when by sensible heat body mounting on the sensible heat face 113 of metal cap 11 time, the metal cap 11 and first cylindrical shell 12 overcome the elastic force of volute spring 14 and do relatively moving on axially Y2 or Y2 with respect to second cylindrical shell 13 with this structure.

Between first cylindrical shell 12 and second cylindrical shell 13, form anti-trip gear 15.Just can prevent that by means of this anti-trip gear 15 metal cap 11 and first cylindrical shell 12 from deviating under volute spring 14 spring pressure effects from second cylindrical shell 13.Anti-trip gear 15 shown in the figure, the center section that makes first cylindrical shell 12 shrinks and forms narrow width of cloth portion 121, make the first half of second cylindrical shell 13 become the large-diameter portion 131 littler simultaneously than the internal diameter of first cylindrical shell 12, Lower Half is become than the little minor diameter part 132 of narrow width of cloth portion's 121 formed internal diameters, and become the structure of the ladder that is produced by the large-diameter portion 131 and the diameter difference between the minor diameter part 132 of second cylindrical shell 13 with 121 supportings of narrow width of cloth portion.

In Figure 28 of expression heat sensor user mode, pot etc. is placed on the sensible heat face 113 by sensible heat body 4.Contained soup or wet goods 41 in the sensible heat body 4.As previously mentioned, second cylindrical shell 13, insert loosely in the axial other end of first cylindrical shell 12 with its axial end, so just allow to do relatively moving of axial Y1 or Y2 direction between itself and first cylindrical shell 12, volute spring 14 then is configured between metal cap 11 and first cylindrical shell 12 and second cylindrical shell 13.So in the time of on the sensible heat face 113 that is placed metal cap 11 by sensible heat body 4, the metal cap 11 and first cylindrical shell 12 overcome the elastic force of volute spring 14, axially relatively moving on the Y1 with respect to second cylindrical shell 13, and stop at comprise soup or wet goods 41 by on the position of the Spring balanced of sensible heat body general assembly (TW) and volute spring 14.Just can positively relax impact when being placed on the sensible heat face 113 by means of this effect that relatively moves with spring by sensible heat body U.

, be included in the metal cap 11 in the exterior body 1 herein, the outside of its top board 111 constitutes sensible heat face 113, and the electrode 211 of posistor 21 is crimped on the inside of metal cap 11.Like this, pass on the posistor 21 from metal cap 11 by the heat on the sensible heat face that is reached metal cap 11 by sensible heat body 4, and detected by posistor 21.Like this,, utilize the good switching characteristic of posistor 21, just can save level calibrating circuit and on-off circuit and realize the heat sensor of simple circuit structure owing to utilizing posistor 21 to detect heat.

Using the thermistor of negative temperature characteristic in the prior art is known as thermal sensing element.But resistance descends the resistance-temperature characteristic of the thermistor of negative temperature coefficient one by one with the temperature rising, does not have tangible switching characteristic between temperature and resistance.Therefore can not obtain switching characteristic by negative tempperature coefficient thermistor itself, and must additional levels calibrating circuit and on-off circuit.In contrast, 21 of posistors resistance when temperature arrives a certain numerical value sharply changes and has a switching characteristic.Thereby can save level calibrating circuit and on-off circuit, circuit structure is simplified.

Posistor 21, its electrode 211 contacts with 114 of the insides of the top board 111 of metal cap 11, its terminal component 37 is compressed in the interval D between cover 34 and the posistor 21, and therefrom with electrode 212 Elastic Contact, owing to posistor 21 is crimped on the inside 114 of top board 111, just reaches thermal coupling efficiently between metal cap 11 and the posistor 21.And, be subjected to be expanded at metal cap 11, perhaps by sensible heat body 4 cooling and metal cap 11 when shrinking follows the flexible of such metal cap that expands with heat and contract with cold 11 also can be absorbed by the elasticity of

terminal component

37,38 by the heat of sensible heat body 4.

And then posistor 21 is to contact joint with the inside 114 of metal cap 11 top boards 111, and need not fixed thereonly, even metal cap 11 has to expand with heat and contract with cold, posistor 21 can not be subjected to its flexible influence yet.So posistor 21 just can not be subjected to the thermal coupling that the influence of the expanding with heat and contract with cold ground of metal cap 11 is realized and metal cap 11 is stable.Can prevent that thus the heat that produces because of expanding with heat and contract with cold from detecting error.

Metal cap 11 is for there being the tubular of continuous barrel 112 around end face 111, and posistor 21 is configured within the metal cap 11.On this structure, the cover 39 of additional configurations in metal cap 11 also, mark off the space that holds posistor 21 with it from peristome, its periphery supported by the barrel 112 of metal cap 11, and seals position between the inner face of periphery and barrel 112.Utilize this structure, even in the many atmosphere gas of moisture and chlorine use or soup or wet goods 41 from the sensible heat face 113 by sensible heat body 4, for example under the occasion of overflowing in the pot, it is also minimum that moisture, chlorine, soup or wet goods 41 are invaded the probability of the spatial accommodation 115 that positive temperature coefficient (PTC) thermal resistance 21 is arranged, and can improve its reliability.

And, posistor 21, its electrode 211 is to contact with 114 of the insides of the top board 111 of metal cap 11, its terminal component 37 contacts with electrode 212, terminal component 38 is conductings with metal cap 11, so can utilize the part of metal cap 11, thereby can obtain the heat sensor of designs simplification as circuit.

Terminal component 37 is compressed in the interval D between cover 39 and the posistor 21, and terminal component 38 is supported by cover 39, so can use cover 39 double as terminal supporters.Therefore, use less parts just passable, can make simple structure, assembling easily, pair of terminal parts the 37, the 38th, constitute by sheet metal, just can make it have necessary function simply, for example elasticity crimping function.Constitute because cover 39 is insulating material, can support pair of

terminal parts

37,38 electrically insulated from one another ground, just can insulate these

terminal components

37,38 and the metal cap 11 that becomes a circuit part reliably.

Figure 29 is the cut-open view of the another embodiment of expression heat sensor of the present invention, and Figure 30 is the amplification backplan of the part-structure of heat sensor shown in Figure 29 assembly.Figure 31 is the cut-open view along A31 among Figure 30-A31 line.The sequence number identical with used sequence number among Fig. 1-28 among the figure represented identical structure division.The spring leaf 3 transversal metal caps 11 that constitute hold down gag internally dispose.The two ends that form contraction flow region (or teat) 115,116, spring leaf 3 on the interior perimembranous of metal cap 11 are supported with contraction flow region 115,116.

Heat detecting device 2 comprises thermal sensing element 21 and insulation shell 22, is configured in the metal cap 11 (referring to Figure 30 and 31).The inner space 221 that holds thermal sensing element 21 is arranged in the insulation shell 22.Inner space 221 is at a side opening relative with bottom 224, and with lid 23 these openings of sealing, insulation shell 22, connect airtight with the inside 114 of metal cap 11 its bottom 224, makes it thermal coupling.

The posistor that constitutes thermal sensing element 21 is discoideus or the gusset shape, be disposed among the inner space 221 of insulation shell 22, and with inner face 227 thermal couplings of bottom 224.The inner face thermal coupling of thermal sensing element 21 and bottom 24 has only the thickness of slab of a bottom 224 between sensible heat face 113 on the outside that is set in bottom 224 and thermal sensing element 21.Thereby the heat energy of sensible heat face 113 efficiently and apace passes on the thermal sensing element 21.

Referring to Figure 29, exterior body 1 comprises that first is stopped 12, the second cylindrical shells 13 and volute spring 14.First cylindrical shell 12, its axial end is inserted and secured in the peristome of metal cap 11.An axial end of second cylindrical shell 13 inserts in the axial other end of first cylindrical shell 12 loosely, and makes whereby between its first cylindrical shell 12 relatively moving on axial Y1 or the Y2 direction can be arranged.Volute spring 14 is configured between the spring leaf 3 and second cylindrical shell 13.

This structure, in the time of on the sensible heat face 113 that is placed metal cap 11 by sensible heat body 4, the metal cap 11 and first cylindrical shell 12 overcome the elastic force of volute spring 14 and are axially relatively moving with respect to second cylindrical shell 13 on Y1 or the Y2 direction.

Figure 32 is the phantom view of an embodiment again of expression heat sensor of the present invention, and Figure 33 is that the part of heat sensor shown in Figure 32 is amplified exploded perspective view, and among the figure, the sequence number identical with sequence number used among Figure 29-31 represented identical structure division.In the present embodiment, first cylindrical shell 12 has a plurality of bent sheet 123 of bending to the inside at an axial end, and volute spring 14 is configured between the bent sheet 123 and second cylindrical shell 13.This structure promotes metal cap 11 equably by the elastic pressure of volute spring 14, can make by the thermal coupling of sensible heat body and heat detecting device to stablize, and realizes the temperature detection of just surveying.

Contraction flow region 115,116 is arranged on the metal cap 11, and there are a plurality of projections 117 that formed by otch the below of contraction flow region 115,116, makes projection 117 outstanding to the inside of metal cap 11.On the position corresponding of first cylindrical shell 12 cavern part 124 is set with projection 117.11 of metal caps are by on the cavern part 124 that projection 117 is hooked on first cylindrical shell 12 and fit together with first cylindrical shell 12.

Though omitted in the drawings, obviously be can be disclosed technology among Fig. 1-24, what at least two kinds in the disclosed technology made up as required among disclosed technology and Figure 29-33 among Figure 25-28.

As previously discussed, the present invention can obtain following effect:

(a) can provide a kind of and can prevent that producing heat because expanding with heat and contract with cold examines Survey the heat sensor of error.

(b) can provide a kind of can prevent really that Yin Tang or wet goods from overflowing and Make the heat sensor of temperature-sensitive element performance depreciation.

Claims

1, a kind of heat sensor, it comprises exterior body, heat detecting device and hold down gag is characterized in that:

Above-mentioned exterior body comprises metal cap, and above-mentioned metal cap is the tubular that top board is arranged, and the outside of above-mentioned top board constitutes the sensible heat face;

Above-mentioned heat detecting device is configured in the above-mentioned metal cap, with the inner face of above-mentioned top board with non-adhering state thermal coupling;

Above-mentioned hold down gag has a spring leaf at least, by the elastic pressure of this spring leaf and above-mentioned heat detecting device is crimped on the inner face of above-mentioned metal cap.

2, the heat sensor described in claim 1, wherein, above-mentioned heat detecting device comprises thermal sensing element and insulation shell, above-mentioned thermal sensing element be contained within the above-mentioned insulation shell and with the internal face thermal coupling of above-mentioned insulation shell, above-mentioned insulation shell contacts with the above-mentioned inner face of above-mentioned metal cap top board.

3, the heat sensor described in claim 2, wherein, above-mentioned thermal element is a posistor.

4, the heat sensor described in claim 2, wherein, above-mentioned posistor has electrode on the two sides of its thickness direction, and the pair of electrodes plate contacts with above-mentioned electrode surface respectively.

5, the heat sensor described in claim 4, wherein, a side of above-mentioned battery lead plate is added on elastic plate electrode on the above-mentioned posistor to elastic pressure.

6, the heat sensor described in claim 4, wherein, above-mentioned battery lead plate is leaded portion of terminal respectively, and above-mentioned lead terminal portion is positioned at respectively on the position of leaving above-mentioned heat detecting device center line, and is drawn out to the outside of above-mentioned insulation shell.

7, the heat sensor described in claim 4, wherein, above-mentioned battery lead plate is leaded portion of terminal respectively, above-mentioned lead terminal portion passes the ditch portion that is located on the above-mentioned insulation shell medial surface respectively, and keeping between the side of above-mentioned posistor at interval, and exporting to outside the above-mentioned insulation shell.

8, the heat sensor described in claim 1, wherein, the surface that is crimped on the above-mentioned metal cap inner face of above-mentioned insulation shell is single face or mild spherical convex surface.

9, the heat sensor described in claim 1, wherein, above-mentioned insulation shell has the inner space that holds above-mentioned thermal sensing element, and above-mentioned inner space is at the opposite of top board one side opening, above-mentioned opening closes with cap seal, and thermal coupling is connected airtight with the inside of above-mentioned metal cap in its outside of above-mentioned top board.

10, the heat sensor described in claim 1, wherein, above-mentioned hold down gag has framework, and expose in the field that above-mentioned framework surrounded the above-mentioned the inside of metal cap,

Above-mentioned heat detecting device, in the field that above-mentioned framework surrounded with the inside thermal coupling of above-mentioned metal cap.

11, the heat sensor described in claim 10, wherein, the spring leaf of above-mentioned hold down gag forms on above-mentioned framework continuously.

12, the heat sensor described in claim 10, wherein, above-mentioned spring leaf has two at least, clamps the configuration of above-mentioned heat detecting device ground respectively from relative both sides.

13, the heat sensor described in claim 10, wherein, above-mentioned spring leaf is 1, becomes transversal above-mentioned heat detecting device state configuration.

14, the heat sensor described in claim 8 wherein, has the projection that prevents above-mentioned heat detecting device position deflection on the above-mentioned framework.

15, the heat sensor described in claim 1, wherein, the middle body of the above-mentioned sensible heat face of above-mentioned metal cap protrudes on the periphery.

16, the heat sensor described in claim 1, wherein, the above-mentioned metal cap of above-mentioned exterior body forms the tubular around above-mentioned end face continuous side walls,

Above-mentioned exterior body 1 also has cover, and above-mentioned cover is made by insulating material, is configured to the state of transversal above-mentioned metal cap inside,

Above-mentioned heat detecting device comprises posistor and pair of terminal parts, above-mentioned posistor, electrode is arranged respectively on relative two sides, be configured in the above-mentioned metal cap, a side of above-mentioned electrode is that face contacts with the inside of the top board of above-mentioned metal cap

One side of above-mentioned terminal component, the above-mentioned hold down gag of double as, make and be compressed in the above-mentioned interval between above-mentioned cover and the above-mentioned posistor by sheet metal, whereby and with the opposing party's Elastic Contact of above-mentioned electrode, and above-mentioned posistor is crimped on the above-mentioned the inside of above-mentioned top board

The opposing party of above-mentioned terminal component is made by sheet metal, by above-mentioned cover support, and with above-mentioned metal cap conducting.

17, the heat sensor described in claim 16 wherein, has recess on the inside of the above-mentioned top board of above-mentioned metal cap,

Above-mentioned posistor is configured in the above-mentioned recess, and locatees with this.

18, the heat sensor described in claim 16, wherein, the guide line portion that above-mentioned terminal component has consubstantiality to form, above-mentioned leading part runs through above-mentioned cover and derives from above-mentioned open side.

19, the heat sensor described in claim 17, wherein, the part that above-mentioned leading part runs through above-mentioned cover seals with sealant.

20, the heat sensor described in claim 1, wherein, above-mentioned exterior body also comprises first cylindrical shell, second cylindrical shell and volute spring,

Above-mentioned first cylindrical shell, in its axial one distolateral peristome that is inserted and secured on above-mentioned metal cap,

Above-mentioned second cylindrical shell, its axial end embed loosely above-mentioned first drum shaft to the other end, allowing therefrom has axial relatively moving between itself and above-mentioned first cylindrical shell,

Above-mentioned volute spring is configured between above-mentioned metal cap and above-mentioned first cylindrical shell and second cylindrical shell.

21, the heat sensor described in claim 20, wherein, above-mentioned spring leaf is configured to the state of the inside of transversal above-mentioned metal cap.

22, the heat sensor described in claim 21, wherein, above-mentioned first cylindrical shell is provided with a plurality of bent sheet of bending to the inside on distolateral above-mentioned axial one,

Above-mentioned volute spring is configured between above-mentioned bent sheet and above-mentioned second cylindrical shell.