CN207097758U - A kind of Miniature heat protector - Google Patents

Abstract

A kind of Miniature heat protector is the utility model is related to, it is mainly used in protecting while the overtemperature of micromachine or other control boards, overcurrent.The utility model is provided with inserted sheet, including the fat point of inserted sheet, output end and the claw of inserted sheet first and the claw of inserted sheet second inwardly curved and correspond to each other；Quiet pin is provided with, it includes the fat point of quiet pin and the claw of quiet pin first and the claw of quiet pin second inwardly curved and correspond to each other；Nonmetallic base is additionally provided with, it is quadrangle, is provided with inserted sheet die cavity, quiet foot type chamber, the heating wire die cavity to match with inserted sheet, quiet pin and heating wire, and they are realized by four closing steps and four detents；Nonmetallic base and cage connection, intermediate layer are insulating part.The utility model structure design is more rationally, security is higher, service life is longer, and heating wire will not produce thermal deformation when running into instantaneous large-current because expansion is powered, and can obtain longer resetting time.

Description

A kind of Miniature heat protector

Technical field

A kind of Miniature heat protector is the utility model is related to, it is mainly used in the mistake of micromachine or other control boards Protected while temperature rise, overcurrent, it is indispensable.

Background technology

At present, motor typically all installs a thermal protector, and it is mainly overtemperature, overcurrent protection that it, which is acted on,.In use, Thermal protector is close on motor housing, when motor passes through high current, thermal protector internal heating element moment produce compared with Big heat causes bimetal leaf bending upset, and disconnects moving contact, plays the protective effect of overload current；In addition, work as motor Work long hours for some reason, cause motor housing temperature too high, along with thermal protector internal heating element produces heat After amount superposition bimetal leaf heated bending can be promoted to overturn, and disconnect moving contact, play the protective effect of overtemperature.

China Patent No. ZL200410098345.1 discloses the invention of a kind of entitled " low current electric motor protector " Patent, the primary structure of the patent are as follows：It is made up of metal base plate and two metal shells separated, is connected with metal base plate The bimetallic element of contact-carrying, screw type heating wire both ends connect with the metal shell of two separation, and it uses spot welding to connect, gold Separated using resistant to elevated temperatures insulating part between category bottom plate and the metal shell of two separation, after above-mentioned several part connections, that is, formed Thermal protector power circuit；Specifically, the patent characteristic includes：Metal shell and flange thereon, separated on metal cover At least one formation birdcage in one cap and the second cap, the first cap and the second cap, a heater are contained in described Birdcage in, an a pad i.e. non-metallic insulation part is provided between metal shell and metal cover.Above-mentioned patent is in reality Border using when have the following disadvantages：1st, because two caps of metal first separated and the second cap and screw type heating wire are electric Clearance for insulation is smaller, typically only 0.5-1mm, and heating wire welds rear enclosed in metal cover, and its position ensures by welding procedure, Electric insulation gap is smaller, it is difficult to accurately measure, if meeting instantaneous large-current, heating wire, which is powered, to be expanded, and is acted in fuel factor Lower screw type heating wire can produce deformation, such as heating wire arch, may cause electricity with the metal cover contact short circuits of two separation Protection feature failure is flowed, screw type heating wire can be blown when serious and causes thermal protector bad, causes motor can not normal work； 2nd, the birdcage of metal cover, be not only easily caused the partial short-circuit of heater and make product failure, sometimes can also after short circuit shape Into secondary improper conducting, cause bigger security risk.

China Patent No. ZL200720184795.1 discloses the utility model patent of entitled " a kind of overload protective device ", It includes base, cover plate, patch piece and contact feet, but the structure is not particularly suited for heating wire component, it with it is of the present utility model Purpose also differs, and it also has the following disadvantages：Due to having welded circular arc heating wire, semicircular arc between patch piece and quiet pin Heating wire be fixed on the heating wire loading type intracavitary of semicircular arc, if meeting instantaneous large-current, heating wire is powered expansion, The lower screw type heating wire of fuel factor effect produces deformation, it is most likely that can tilt upward, now heating wire can be with bimetal leaf contact Short circuit, current protection characteristic is caused to fail；Problem can blow screw type heating wire when serious and cause thermal protector bad, cause electricity Machine can not normal work.

The content of the invention

The purpose of this utility model is to overcome above shortcomings in the prior art, and provides a kind of structure design more Rational Miniature heat protector, thermal deformation will not be produced because of energization expansion when running into instantaneous large-current to reach heating wire Purpose.

Technical scheme is used by the utility model solves above-mentioned technical problem：The Miniature heat protector include shell, Bimetal leaf, movable contact, stationary contact, insulating part and the Curved heating wire with both ends, it is characterised in that：It is additionally provided with Be provided with inserted sheet, quiet pin and nonmetallic base, be fixed with described inserted sheet the fat point of inserted sheet, output end and inwardly it is curved and that This corresponding claw of inserted sheet first and inserted sheet second claw, the fat point of described inserted sheet weld with heating wire first end；Described The fat point of quiet pin and the claw of quiet pin first and the claw of quiet pin second inwardly curved and correspond to each other are fixed with quiet pin, it is described The quiet fat point of pin welds with heating wire the second end；Described nonmetallic base is quadrangle, be provided with inserted sheet, quiet pin and Inserted sheet die cavity that heating wire matches, quiet foot type chamber, heating wire die cavity, described heating wire die cavity is positioned at centre, inserted sheet die cavity With quiet foot type chamber it is located at both sides, to ensure that nonmetallic base and inserted sheet, quiet pin are reliably connected；Described nonmetallic base with it is outer Shell connects, and intermediate layer is insulating part, heat accumulation when enabling the heating wire be powered so that thermal protector obtains the resetting time of more clump.

The claw of inserted sheet first and inserted sheet second claw described in the utility model is located at inserted sheet stage casing and their both sides point She You not inserted sheet groove；The described claw of quiet pin first and the side of the claw of quiet pin second are respectively equipped with quiet pin groove, wherein one Individual quiet pin groove sets up one of them quiet pin claw and the fat point of quiet pin in its both sides separately；Four are provided with described nonmetallic base Individual closing step and four detents, at least two middle benches in four closing steps, they are located at quadrangle On the middle part inward position of long side, four detents are arranged in the long side of quadrangle.It is of the present utility model optimal Structure.

Insulating part described in the utility model is made of high-temperature material, and the gear of diagonally opposing corner distribution is provided with insulating part Plate, insulated to be positioned to the output end of heating wire two, increase electrical strength.

Heating wire described in the utility model point fat with inserted sheet and the fixed of the fat point of quiet pin are contacted using cross, make heating Wire bond connects more firm.

Heating wire die cavity described in the utility model is in circular arc type, and it coincide with heating wire shape so that heating wire is shaped Position is more accurate, and technical parameter is more stable.

Two symmetrical and aduncate insulating part knuckles are additionally provided with insulating part described in the utility model, so as to The nonmetallic supporting connection of base.

Two aduncate shell knuckles are also directly connected with shell described in the utility model, they and non-metal bottom Seat fastening, avoid in the prior art flange portion existing on metal shell the shortcomings that.

Rectangle boss is provided with shell described in the utility model, round boss is provided with the rectangle boss, The bimetal leaf of one group of band, one movable contact is connected by padding with round boss, forms casing assembly.

The utility model compared with prior art, has advantages below：Structure design is more rationally, security is higher, uses Life-span is longer, and the shell of the utility model design is installed and secured within independent and special non-metallic insulation base, and circular arch Structure is also designed on nonmetallic base, and heating wire is contained in the special nonmetallic base, will not cause the office of heater Portion's short circuit, will not also form secondary improper conducting；Meanwhile heating wire electric insulation gap, in more than 3mm, use is safer, And the heater accommodating chamber of closing, heater is preferably protected, and obtain longer resetting time.

Brief description of the drawings

Fig. 1 is the components broken down dimensional structure diagram of the utility model embodiment 1.

Fig. 2 is axonometric schematic diagram of the utility model embodiment 1 based on shell surface.

Fig. 3 is dimensional structure diagram of the utility model embodiment 1 based on non-metal bottom seat surface.

Fig. 4 is dimensional structure diagram of the utility model embodiment 1 based on the inside of shell.

Fig. 5 is the dimensional structure diagram of bimetal leaf part in the utility model embodiment 1.

Fig. 6 is that the dimensional structure diagram after bimetal leaf part is removed in the utility model Fig. 4.

Fig. 7 is the dimensional structure diagram for removing shell and nonmetallic base in the utility model embodiment 1.

Fig. 8 is the dimensional structure diagram of insulating part in the utility model embodiment 1.

Fig. 9 is the dimensional structure diagram for removing shell and insulating part in the utility model embodiment 1.

Figure 10 is the dimensional structure diagram of nonmetallic base in the utility model embodiment 1.

Figure 11 is the dimensional structure diagram of heating wire component in the utility model embodiment 1.

Figure 12 is the dimensional structure diagram of inserted sheet in the utility model embodiment 1.

Figure 13 is the dimensional structure diagram of quiet pin in the utility model embodiment 1.

Figure 14 is the overall structure schematic cross-sectional view of the utility model embodiment 1.

Figure 15 is the mplifying structure schematic diagram of Figure 10 in the utility model.

Figure 16 is the dimensional structure diagram of heating wire component in the utility model embodiment 2.

Figure 17 is the dimensional structure diagram of nonmetallic base in the utility model embodiment 2.

Figure 18 is the dimensional structure diagram of heating wire in the utility model embodiment 3.

In figure：Shell 1, bimetal leaf 2, pad 3, movable contact 41, stationary contact 42, insulating part 5, heating wire 6, inserted sheet 7 are quiet Pin 8, nonmetallic base 9, shell output end 11, shell knuckle 1, shell knuckle 2 122, round boss 13, rectangle is convex Platform 14, outer casing groove 15, bimetal leaf connection end 1, bimetal leaf connection end 2 22, baffle plate 1, baffle plate 2 52, knuckle One 53, knuckle 2 54, die cavity 55, heating wire first end 61, heating wire the second end 62, inserted sheet output end 71, inserted sheet first Claw 72, the second claw of inserted sheet 73, the fat point 74 of inserted sheet, inserted sheet groove 1, inserted sheet groove 2 76, inserted sheet protrusion 1, inserted sheet Groove 3 78, inserted sheet protrusion 2 79, inserted sheet groove 4 710, inserted sheet groove 5 711, inserted sheet stage casing 713, the quiet fat point 81 of pin, quiet pin First claw 82, quiet the second claw of pin 83, quiet pin protrusion 1, quiet pin groove 1, quiet pin groove 2 86, quiet pin protrusion two 87, quiet pin groove 3 88, detent 1, detent 2 92, detent 3 93, detent 4 94, close step One 95, step 2 96 is closed, closes step 3 97, closes step 4 98, heating wire die cavity 99, inserted sheet die cavity 910, quiet foot type chamber 911, the first positioning boss 912, the second positioning boss 913, the 3rd positioning boss 914, the 4th positioning boss 915, the 5th positioning Boss 916, casing assembly 101, base assembly 102, heating wire component 103, heating wire load die cavity boss 9111.

Embodiment

Embodiment of the present utility model is elaborated below in conjunction with the accompanying drawings.

Embodiment 1：

Referring to Fig. 1~Figure 15, Miniature heat protector of the present utility model includes shell 1, bimetal leaf 2, pads 3, be dynamic tactile Point 41, stationary contact 42, insulating part 5, heating wire 6, inserted sheet 7, quiet pin 8, nonmetallic base 9.

Rectangle boss 14 is provided with shell 1, round boss 13 is provided with rectangle boss 14, one group of one, band is dynamic The bimetal leaf 2 of contact 41 is reliably connected by pad 3 and round boss 13, forms casing assembly 101, and cause weld strength It is better.

Shell output end 11 is provided with shell 1, it is i.e. outer that two aduncate shell knuckles are also directly connected with shell 1 Shell knuckle 1, shell knuckle 2 122, they are fastened with nonmetallic base 9, are connected in order to which base assembly 102 matches, outside Shell 1s2 is additionally provided with outer casing groove 15, and it can correspond to the rectangle boss 14 on the inside of shell.

Bimetal leaf connection end 1, bimetal leaf connection end 2 22 are provided with bimetal leaf 2, pad 3 is welded on double On sheet metal connection end 1, movable contact 41 is welded on bimetal leaf connection end 2 22.

Inserted sheet 7, quiet pin 8 and heating wire 6 are installed in nonmetallic base 9, a stationary contact 42, heating are connected on quiet pin 8 The both ends of silk 6 are connected with inserted sheet 7 and quiet pin 8 respectively；Closing step 1, closing step two are provided with around nonmetallic base 9 96th, step 3 97, closing step 4 98 are closed；It is nonmetallic to ensure that nonmetallic base 9 and inserted sheet 7, quiet pin 8 are reliably connected The surrounding of base 9 is provided with four detents, i.e. detent 1, detent 2 92, detent 3 93, detent 4 94；After inserted sheet 7, quiet pin 8 and nonmetallic base 9 with heating wire 6 connect, base assembly 102 is formed.H is electric insulation Gap.

Inserted sheet die cavity 910, the quiet foot type chamber 911 and peace of the quiet pin 8 of installation of installation inserted sheet 7 are provided with nonmetallic base 9 Fill the heating wire die cavity 99 of heating wire 6；Two detents are respectively arranged with the both sides of inserted sheet die cavity 910, quiet foot type chamber 911 That is detent 1, detent 2 92, detent 3 93, detent 4 94 so that inserted sheet 7, quiet pin 8 and nonmetallic All around position that more reliable, security is higher after the connection of base 9.In the present embodiment, heating wire 6 presses close to nonmetallic base 9 all without there is short-circuit risks.

Heating wire die cavity 99 is in circular arc type, and the shape of heating wire 6 is coincide substantially so that the sizing position of heating wire 6 is more accurate Really, technical parameter is more stable.

Inserted sheet output end 71, the first claw of inserted sheet 72, the second claw of inserted sheet 73, the fat point 74 of inserted sheet are provided with inserted sheet 7, it is quiet The fat point 81 of quiet pin, the first claw of quiet pin 82, the second claw of quiet pin 83 are provided with pin 8.Heating wire 6 and the fat point 74 of inserted sheet, quiet pin The connection of fat point 81 is fixed using cross spot welding so that and the welding of heating wire 6 is more solid and reliable.

Helically the heating wire die cavity 99 in type, and nonmetallic base 9 coincide heating wire 6, heat accumulation energy when heating wire 6 is powered Power is stronger so that thermal protector is to obtain longer resetting time.

Heating wire component 103 loads nonmetallic base 9, and the first claw of inserted sheet 72, the second claw of inserted sheet 73 of inserted sheet 7 are distinguished Detent 1 with nonmetallic base 9, detent 2 92 are corresponding to be connected, the first claw of quiet pin 82 of quiet pin 8, quiet pin the The corresponding connection of the detent 3 93 with nonmetallic base 9, detent 4 94 respectively of two claws 83.

Insulating part 5 is made of exotic material, and the both sides of 5 intermediate cavity of insulating part 55 are provided with the baffle plate one of diagonally opposing corner 51, baffle plate 2 52, be to 6 liang of output ends of heating wire heating wire first end 61, heating wire the second end 62 positioning insulation use, Increase electrical strength；Knuckle 1, knuckle 2 54 are additionally provided with insulating part 5, they are symmetrical arranged and curved inwardly, so as to 102 supporting connection of base assembly.In the present embodiment, insulating part 5 is a soft plastic sheet, and it is served as a contrast in shell 1 and non-metal bottom Between seat 9, after shell 1 and nonmetallic 9 riveted of base, it is clipped in the middle, and plays buffer action.

After casing assembly 101, base assembly 102, insulating part 6 are assembled, that is, form Miniature heat protector.So that this The structure design of utility model more rationally, installation is easier, security is higher, service life is longer, in addition its sealing property compared with Good, thermal protector has explosion prevention function.

After nonmetallic base 9, shell 1, insulating part 5 assemble, movable contact 41, stationary contact 42 contact, and composition is powered back Road, after special mechanical device fine setting, technical parameter reaches setting；Shell output end 11 and inserted sheet output end 71 are in Tongfang To setting, installation connection is more convenient, and sealing property is preferable, and thermal protector has explosion prevention function.

In above example, shell 1, pad 3, inserted sheet 7, quiet pin 8 are made of stainless steel, and bimetal leaf 2 uses iron-nickel alloy It is made, movable contact 41, stationary contact 42 are made of silver-bearing copper, and insulating part 5 is made of high-temperature insulation band, and heating wire 6 uses high-resistance alloy Silk is made, and nonmetallic base 9 is made of plastics or ceramics.

Referring to Figure 12, inserted sheet 7 of the present utility model, its first claw of inserted sheet 72 and the second claw of inserted sheet 73 it is inwardly curved and that This is corresponding, and the fat point 74 of inserted sheet is located at the both sides in inserted sheet stage casing 713 with inserted sheet output end 71 respectively, the fat point 74 of inserted sheet and heating wire the One end 61 welds, and the first claw of inserted sheet 72 and the second claw of inserted sheet 73 are located on inserted sheet stage casing 713 and their both sides difference Provided with inserted sheet groove 1, inserted sheet groove 2 76, inserted sheet groove 4 710, inserted sheet groove 5 711；Inserted sheet protrusion 1, inserted sheet are recessed Groove 3 78, inserted sheet protrusion 2 79 are to lay the side of heating wire 6, that is, the side for having heating wire first end 61.

Referring to Figure 13, quiet pin 8 of the present utility model, its quiet the first claw of pin 82 and the second claw of quiet pin 83 it is inwardly curved and that This is corresponding, and the quiet fat point 81 of pin welds with heating wire the second end 62, the side of quiet the first claw of pin 82 and the second claw of quiet pin 83 Quiet pin groove 1 and quiet pin groove 2 86 are respectively equipped with, wherein quiet pin groove 1 is by the first quiet pin claw 82 and the fat point of quiet pin 81st, quiet pin protrusion 1, which sets up separately, sets up quiet the second claw of pin 83 and quiet pin protrusion 2 87 separately in its both sides, quiet pin groove 2 86 Its both sides；To lay the opposite side of heating wire 6 in quiet pin groove 3 88, that is, the side for having heating wire the second end 62.

Referring to Figure 15, nonmetallic base 9 of the present utility model, it is quadrangle, be provided with inserted sheet 7, quiet pin 8 and Inserted sheet die cavity 910, quiet foot type chamber 911 and the heating wire die cavity 99 that heating wire 6 matches, heating wire die cavity 99 are inserted positioned at centre Piece die cavity 910 and quiet foot type chamber 911 are located at both sides；Close step 1, closing step 2 96, closing step 3 97, closing platform At least two middle benches in rank 4 98, that is, step 3 97 and closing step 4 98 are closed, they are located at quadrangle long side On the inward position of middle part, detent 1, detent 2 92, detent 3 93, detent 4 94 are arranged at four In the long side of side shape, the first positioning boss 912, the positioning of the second positioning boss the 913, the 3rd are additionally provided with the long side of the quadrangle Boss 914, the 4th positioning boss 915, the 5th positioning boss 916.

Embodiment 2：

Referring to Figure 16-Figure 17, in the present embodiment, heating wire 6 is wire rod plate armature, matched non-metal bottom Heating wire is provided with seat 90 and loads die cavity 911, heating wire loads in die cavity 911 and is provided with heating wire positioning boss 9111, with Ensure that the positioning of heating wire 6 is used, it is ensured that the uniformity of technical parameter；Remaining structure in the present embodiment it is same as Example 1 or It is equivalent, no longer describe.

Embodiment 3：

Referring to Figure 18, in the present embodiment, heating wire 6 is band plate armature, matched nonmetallic base with Identical in embodiment 2, remaining structure is same as Example 1 or equivalent, no longer describes.

" Miniature heat protector " as described herein refers to：Length dimension is not more than 28mm, and width dimensions are not more than 15mm, high Spend the thermal protector that size is not more than 10mm.

" Curved heating wire " as described herein refers to：The shape of the heating wire can be that helical buckling shape or plane connect Continuous Curved etc., such as wire spiral type, wire rod is plate, and band is plate etc..

By foregoing description, those skilled in the art can implement.

The title that the utility model above parts are taken can be different, all that described structure is conceived according to the utility model patent Make, the equivalent or simple change that feature and principle are done, be included in the protection domain of the utility model patent.

Claims (8)

1. a kind of Miniature heat protector, including shell, bimetal leaf, movable contact, stationary contact, insulating part and with the curved of both ends Curved heating wire, it is characterised in that：Inserted sheet, quiet pin and nonmetallic base are additionally provided with, it is fat to be fixed with inserted sheet on described inserted sheet Point, inserted sheet output end and the claw of inserted sheet first and the claw of inserted sheet second inwardly curved and correspond to each other, the fat point of described inserted sheet Welded with heating wire first end；The fat point of quiet pin and quiet pin that is inwardly curved and corresponding to each other are fixed with described quiet pin One claw and the claw of quiet pin second, the fat point of described quiet pin weld with heating wire the second end；Described nonmetallic base is four Side shape, inserted sheet die cavity, quiet foot type chamber, the heating wire die cavity to match with inserted sheet, quiet pin and heating wire is provided with, it is described For heating wire die cavity positioned at centre, inserted sheet die cavity and quiet foot type chamber are located at both sides；Described nonmetallic base and cage connection, it is middle Layer is insulating part.

2. Miniature heat protector according to claim 1, it is characterised in that：The described claw of inserted sheet first and inserted sheet second Claw is located at inserted sheet stage casing and their both sides are respectively equipped with inserted sheet groove；The described claw of quiet pin first and the claw of quiet pin second Side be respectively equipped with quiet pin groove, one of them quiet pin groove by one of them quiet pin claw and the fat point of quiet pin set up separately its two Side；It is provided with four closing steps and four detents on described nonmetallic base, in four closing steps at least There are two middle benches, they are located on the middle part inward position of quadrangle long side, and four detents are arranged at quadrangle Long side on.

3. Miniature heat protector according to claim 1 or 2, it is characterised in that：It is tiltedly right to be provided with described insulating part The baffle plate of angle distribution.

4. Miniature heat protector according to claim 1 or 2, it is characterised in that：Described heating wire and the fat point of inserted sheet and The fixed of the quiet fat point of pin uses cross contact.

5. Miniature heat protector according to claim 1 or 2, it is characterised in that：Described heating wire die cavity is in circular arc type, It coincide with heating wire shape.

6. Miniature heat protector according to claim 1 or 2, it is characterised in that：Two are additionally provided with described insulating part Individual symmetrical and aduncate insulating part knuckle.

7. Miniature heat protector according to claim 1 or 2, it is characterised in that：Two are also directly connected with described shell Individual aduncate shell knuckle, they are fastened with nonmetallic base.

8. Miniature heat protector according to claim 1 or 2, it is characterised in that：Rectangle is provided with described shell Boss, round boss is provided with the rectangle boss, and the bimetal leaf of one group of band, one movable contact is convex by pad and circle Platform connects, and forms casing assembly.