A kind of non-short-circuit type PTC power-off restoration thermostat
Technical field
The utility model relates to a kind of thermostat, in particular a kind of non-short-circuit type PTC power-off restoration thermostat.
Background technology
Safety for protection heating combined equipment need to arrange temp-limiting thermostat in heating combined equipment.When heating combined equipment surpasses limiting temperature, the contact of temp-limiting thermostat can disconnect, thereby stops the heating of the electric heating element in heating combined equipment, and continues holding contact off-state, until manual intervention just can make temp-limiting thermostat contact closed reduction again.Manual intervention resetting has two kinds of modes at present, and a kind of is that direct Manual press temp-limiting thermostat reset button makes its reset; Another kind is due to PTC heater (PTC:Positive Temperature Coefficient, positive temperature coefficient) being set in temp-limiting thermostat.When contact disconnects, PTC heater heating makes the thrermostatic bimetal-plate in thermostat keep reversion shape to withstand contact can not reset.Until manually cut off the power supply of heating combined equipment, after PTC heater no longer generates heat and lowers the temperature, bimetal leaf just returns back to the state before reversion, thereby thermostat contact is resetted.
The temperature controller structure of traditional employing PTC heater is generally parallel connection short circuit formula circuit structure, be that the contact circuit (main circuit) of thermostat and the operating circuit of PTC heater are arranged in parallel, (in figure, 10 is PTC element, and 20 is step switch as shown in Figure 1,30 is electrical appliance, 40 is thermostat), when the contact of the step switch contact of thermostat, thermostat work, at this moment PTC heater, in short-circuit condition, is not worked; When the step switch contact of thermostat disconnects, PTC heater work heating, makes the step switch of thermostat remain on the state that contact disconnects, until artificial power-off.This parallel connection short circuit formula circuit structure to the short circuit of PTC heater, causes PTC heater working life short due to for a long time, and security and stability is lower.Meanwhile, because the circuit of PTC heater is connected, in actual use, also have small electric current by PTC heater, make it produce faint heat, the normal work that this easily affects temperature-sensitive bimetal leaf in thermostat, reduces the sensitivity of its temperature-sensitive.
In current PTC power-off restoration thermostat, PTC element is be generally printed on ceramic installing rack or be close to the one end that is placed on installing rack, by contacting indirect with temperature-sensitive bimetal leaf, maintain bimetal leaf always nonreversible at break-off signal point, until deenergization, bimetal leaf reversion drives push rod to make moving contact and fixed contact power-on reset.This structure need to arrange installing rack, increases parts and the assembling procedure of thermostat, complex structure; PTC sheet heats bimetal leaf by the mode of indirect heat transfer simultaneously, and its efficiency of heating surface is low, and thermal losses is large.
Therefore, prior art has yet to be improved and developed.
Utility model content
The purpose of this utility model is to provide a kind of non-short-circuit type PTC power-off restoration thermostat, is intended to solve traditional PTC thermostat security and stability low, and the life-span is short, the technical problem that sensitivity is poor.
The technical solution of the utility model is as follows: a kind of non-short-circuit type PTC power-off restoration thermostat, the temperature-sensitive soft magnetism that comprise shell, is placed in enclosure cooperating with Hard Magnetic, fixed contact and movable contact spring, be connected and promote the actuating strut of movable contact spring, the first spring, the first terminal sheet being connected with fixed contact and the second terminal plate being connected with movable contact spring arranging with Hard Magnetic socket with Hard Magnetic; Described the first terminal sheet and the second terminal plate external power supply, actuating strut separates with movable contact spring, fixed contact and movable contact spring conductive contact form thermostat work loop, wherein, described temperature-sensitive soft magnetism bottom is provided with PTC chip, described first spring one end is connected with an electrodes conduct of PTC chip, and the described first spring other end is connected with the first terminal sheet conduction; Described actuating strut is provided with the second spring, and described actuating strut connects another electrode of PTC chip by the second spring conduction; When temperature raises, temperature-sensitive soft magnetism loses magnetism, the first spring and the second spring pushing action bar move downwards, actuating strut promotes movable contact spring, movable contact spring and fixed contact are separated, and thermostat loop disconnects, actuating strut and movable contact spring conductive contact, form PTC heating loop, PTC chip heating heating temperature-sensitive soft magnetism makes the movable contact spring of thermostat and fixed contact remain on off-state.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described temperature-sensitive soft magnetism bottom is provided with the first groove of fixing the first spring, and described the first spring top snaps in the first groove fixing, and the first spring top is connected with PTC chip conduction.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described temperature-sensitive soft magnetism bottom centre is provided with the second groove of fixing the second spring, and described the second spring top is inserted in the second groove fixing, and the second spring top conductive connects PTC chip.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described PTC chip is printed on temperature-sensitive soft magnetism bottom surface, and two electrodes of PTC chip are placed in respectively the first groove and the second groove.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described actuating strut comprises insulation shell and conducting rod, described insulation shell is provided with installation through hole, and described conducting rod inserts to install in through hole and fixes, and conducting rod passes and movable contact spring interoperation from insulation shell bottom, described the second spring inserts to be installed in through hole, temperature-sensitive soft magnetism is withstood at the second spring top, and conducting rod is withstood in bottom, and the second spring conduction connects PTC chip and conducting rod.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described installation through hole comprises the first through hole of fixed placement the second spring and the second through hole of fixed placement conducting rod, described the first through hole and the second through hole are communicated with setting, in its junction, are provided with concave station; Described conducting rod inserts in the second through hole, and conducting rod passes from the second via bottoms, and conducting rod head is stuck on concave station; Described the second spring is placed in the first through hole, and the second spring top passes from the first through hole withstands temperature-sensitive soft magnetism, and conducting rod head is pushed down in the second spring bottom, is connected with conducting rod conduction.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described insulation shell top is provided with buckle.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, described Hard Magnetic bottom is provided with Hard Magnetic pallet, and described Hard Magnetic pallet center is provided with through hole, and described actuating strut is through through hole and movable contact spring interoperation; Described Hard Magnetic tray edge is provided with conductive rivet, and described the first spring bottom is connected with the first terminal sheet conduction by conductive rivet.
Described non-short-circuit type PTC power-off restoration thermostat, wherein, laciniation is arranged at described conductive rivet top.
The beneficial effects of the utility model: the utility model is optimized by the structure of the PTC thermostat to traditional, a kind of PTC temperature controller structure of non-short-circuit type has been proposed, when normal temperature, moving contact (this moving contact is arranged on movable contact spring) contacts with fixed contact and forms thermostat loop, when excess Temperature, actuating strut promotes movable contact spring downwards, and moving contact and fixed contact are separated, actuating strut conductive contact movable contact spring forms PTC heating loop, makes thermostat remain on off-state.PTC temperature controller structure of the present utility model, when thermostat circuit is normally worked, PTC heating circuit, in off state, is different from the PTC thermostat of traditional short-circuit type parallel circuits, and the utility model is safe, long service life.
The utility model directly arranges PTC chip in the one side (non-temperature-sensitive face) of temperature-sensitive soft magnetism, at temperature-sensitive soft magnetism, arrive operating temperature, after fixed contact and moving contact disconnect, actuating strut contact movable contact spring forms PTC heating loop, the heating of PTC chip is heating temperature-sensitive soft magnetism directly, mode than traditional indirect heat transfer heating, both reduced hot transmission consumption, improve the efficiency of heating, make thermostat more stable, rapidly, work reliably, parts (needing many installing racks in existing bimetal leaf power-off restoration thermostat as PTC component carrier) have been reduced again, improved the production and assembly efficiency of thermostat, reduce its cost.
The utility model proposes a kind of structure actuating strut structure cleverly, the second spring being arranged in actuating strut both realized as interoperation bar and Hard Magnetic the parts that move, and can be used as again the electrical connector that conduction connects PTC chip and conducting rod (movable contact spring).The setting of the second spring, realized on the one hand non-short-circuit type parallel circuits of the present utility model, on the other hand, the elastic force that the second spring has can make Hard Magnetic separate more rapidly (responsiveness that is thermostat is faster) with soft magnetism, makes the fail safe of thermostat higher.
Longer service life of the present utility model, power-off recovery capacity is stronger, and the sensitivity of temperature-sensitive soft magnetism is higher, is swift in motion, safe, is generally applicable to the multiple household products such as electric heater, electromagnetic oven, insulating pot, electric iron.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of traditional short-circuit type parallel circuits PTC thermostat.
Fig. 2 is the front section view of PTC thermostat in the utility model.
Fig. 3 is the side sectional view of PTC thermostat in the utility model.
Fig. 4 is the internal structure schematic diagram of PTC thermostat in the utility model.
Fig. 5 is the structural representation of temperature-sensitive soft magnetism.
Fig. 6 is the structural representation of actuating strut.
Fig. 7 is electrical schematic diagram of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.
The utility model discloses a kind of non-short-circuit type PTC power-off restoration thermostat, as shown in Figure 2, the temperature-sensitive soft magnetism 210 that comprise shell 100, is placed in shell 100 inner cooperatings with on Hard Magnetic 220, fixed contact 310 and movable contact spring 320(movable contact spring 320, be provided with the moving contact 321 coordinating with fixed contact 310), is connected and promotes with Hard Magnetic 220 movable contact spring 320 actuating strut 400, be socketed setting with Hard Magnetic 220 the first spring 500, the first terminal sheet 610 being connected with fixed contact 310 and the second terminal plate 620(being connected with movable contact spring 320 referring to Fig. 3).In practical application, shell 100 inside are provided with static contact (not drawing in figure), and fixed contact 310 is riveted on static contact, and the first terminal sheet 610 is connected with static contact conduction.Concrete, temperature-sensitive soft magnetism 210 is arranged on shell 100 tops, and temperature-sensitive soft magnetism 210 upper surfaces expose the outside temperature-sensitive of shell 100, are also provided with fixedly temperature-sensitive soft magnetism 210 and the temperature-sensitive lid 800 that improves its heat transfer efficiency at shell 100 tops.Hard Magnetic 220 is arranged on shell 100 inside, be placed in temperature-sensitive soft magnetism 210 below, the first spring 500 socket Hard Magnetics 220 arrange, actuating strut 400 is through Hard Magnetic 220 and movable contact spring 320 interoperations.When thermostat is normally worked, the first terminal sheet 610 and the second terminal plate 620 external power supplys, temperature-sensitive soft magnetism 210 absorption Hard Magnetics 220, fixed contact 310 contacts formation thermostat loop (now, actuating strut 400 does not contact with movable contact spring 320) with the moving contact 321 on movable contact spring 320.In practical application, temperature-sensitive soft magnetism 210 bottom surfaces are provided with PTC chip (not drawing in figure), and first spring 500 one end are electrically connected to an electrode of PTC chip, and first spring 500 other ends are connected with the first terminal sheet 610 conductions, actuating strut 400 is provided with the second spring 700, and this second spring 700 is connected with another electrodes conduct of PTC chip, when temperature raises, temperature-sensitive soft magnetism 210 loses magnetism, Hard Magnetic 220 moves downward under the acting in conjunction of gravity and elastic force (elastic force that comprises the first spring and the second spring), actuating strut 400 promotes movable contact spring 320 downwards, moving contact 321 and fixed contact 310 are separated, the work loop of thermostat disconnects, now actuating strut 400 and movable contact spring 320 conductive contacts, form PTC heating loop (being the first terminal sheet 610-the first spring 500-PTC chip-the second spring 700-actuating strut 400-movable contact spring the 320-the second terminal plate 620 loops), PTC chip heating heating temperature-sensitive soft magnetism 210, temperature-sensitive soft magnetism 210 is remained under Curie temperature state, thermostat remains on off-state, until manually cut off the electricity supply.
By above-mentioned this setup, the utility model has been realized a kind of PTC thermostat circuit structure of non-short-circuit type, and its circuit diagram is (wherein 1 is thermostat, and 2 is household electrical appliance, and in figure, arrow is the direction of actuating strut 400 and movable contact spring 320 actions) as shown in Figure 7.As can be seen from Figure 7, when thermostat is normally worked, the setting of opening circuit of PTC circuit; When excess Temperature, actuating strut 400 moves downward movable contact spring 320 is promoted downwards, make moving contact 321 and fixed contact 310 separate (being that thermostat work loop disconnects), now actuating strut 400 and movable contact spring conductive contact, PTC heating loop is connected, the heating of PTC chip, and resistance increases (characteristic of PTC chip), make fixed contact and the moving contact of thermostat remain on off-state, thermostat is not worked.This temperature controller structure of the present utility model is safe and practical, and job stability is high, and physical life is long, and while normally working in thermostat work loop, PTC heating loop can not exert an influence to it.
Below, each parts of thermostat of the present utility model are described in detail.
Shown in Fig. 2, Fig. 3 and Fig. 4, Hard Magnetic 220 bottoms are provided with Hard Magnetic pallet 230, and Hard Magnetic pallet 230 centers are provided with through hole, and actuating strut 400 is through through hole and movable contact spring 320 interoperations; Hard Magnetic pallet 230 edges are provided with conductive rivet 240, and conductive rivet 240 upper ends are electrically connected to the first spring (contacting with the first spring bottom), and lower end is electrically connected to the first terminal sheet 610(and contacts with the first terminal sheet).As shown in Figure 3, it (is that static contact and the first terminal sheet 610 electrically contact in fact that conductive rivet 240 is fixedly connected with the first terminal sheet, and by conductive rivet, both are fixed), be that conductive rivet has two effects, the firstth, fixing riveted joint static contact and the first terminal sheet 610, the second, be connected the first terminal sheet 610 with the first spring 500 conductions.In practical application, in order to dwindle the volume of thermostat, be convenient to the installation of conductive rivet 240, Hard Magnetic pallet one side is provided with the hole slot that holds conductive rivet 240 simultaneously, and conductive rivet 240 is placed in this hole slot and arranges.As shown in Figure 4, laciniation 241 is arranged at the top of conductive rivet 240, and this jagged structure is more conducive to conductive rivet 240 and is connected with the conduction of the first spring 500, guarantees the stability that both are electrically connected to.
Referring to Fig. 3 and Fig. 6, actuating strut 400 comprises insulation shell 410 and the conducting rod 420 that is fixedly connected with Hard Magnetic 220 and Hard Magnetic pallet 230, and insulation shell 410 is provided with installs through hole 430.Concrete, through hole 430 is installed and is comprised that the first through hole 431 of fixed placement the second spring 700 and the second through hole 432, the first through holes 431 of fixed placement conducting rod 420 and the second through hole 432 are communicated with setting, are provided with concave station 433 in its junction.In practical application, for the ease of the installation of conducting rod 420, conducting rod 420 is arranged to T shape, and conducting rod 420 inserts in the second through hole 432, and conducting rod 420 bottoms pass from the second through hole 432 bottoms, and conducting rod 420 heads are stuck on concave station 433 fixing.The second spring 700 is placed in the first through hole 431, the second spring 700 tops and from the first through hole 431, passes and withstand temperature-sensitive soft magnetism 210, the second spring 700 bottoms and push down conducting rod 420 heads, is connected with conducting rod 420 conductions.This setup, on the one hand can realize being electrically connected between PTC chip electrode and movable contact spring 320 by the second spring 700 and conducting rod 420, form PTC heating circuit, on the other hand, the second spring 700 can utilize its elastic force to press fixedly conducting rod 420, avoid conducting rod 420 to rock in thermostat course of action, make the second spring 700 and PTC chip electrode and conducting rod 420 close contacts simultaneously, guarantee that three conducts electricity the stability connecting.Other the second spring 700 can provide a cushion effect effect for temperature-sensitive soft magnetism 210 and Hard Magnetic 220, while avoiding both adhesives, bumps; The second last spring can provide for the molar behavior of Hard Magnetic and actuating strut a power (elastic force), make Hard Magnetic separated with soft magnetism more rapidly, be conducive to improve the responsiveness of thermostat, make it when temperature reaches design temperature, can move rapidly, improve greatly the security performance of thermostat.Each parts of actuating strut 400 are produced simple, easy to assembly, and insulation shell 410 plays protection insulation, can guarantee the security and stability of PTC heating circuit work.
In practical application, insulation shell 410 tops are provided with buckle 411, and Hard Magnetic 220 arranges a pit, and buckle 411 blocks pit, make actuating strut 400 relative with Hard Magnetic 220 fixing.Meanwhile, in actual production, insulation shell 410 can with the 230 integrated molding settings of Hard Magnetic pallet, guaranteeing Hard Magnetic, Hard Magnetic pallet is relative with actuating strut three is fixedly installed (reaching the whole effect of operating stably together); Or, a buckle is set in Hard Magnetic tray bottom, profit is stuck with buckle Hard Magnetic pallet, can realize equally Hard Magnetic, Hard Magnetic pallet is relative with actuating strut three is fixedly installed.
One preferred embodiment in, in order to improve the production and assembly efficiency of thermostat, insulation shell 410, Hard Magnetic pallet 230 and conducting rod 420 integrated injection molding settings (wherein, insulation shell 410 and Hard Magnetic pallet 230 are working of plastics, and conducting rod 420 is metalwork).Concrete operations are, first produce conducting rod 420, then in injection mold, place conducting rod 420, injected plastic slurry, and cooling forming, can obtain insulation shell 410, Hard Magnetic pallet 230 and the integrated parts of conducting rod 420.Now, only need to buckle 411 be buckled into the pit of Hard Magnetic 220 inside from Hard Magnetic 220 bottoms fixingly, can complete the assembling to Hard Magnetic and actuating strut.This setup, can save the production process of independent insulation shell 410 and Hard Magnetic pallet 230, can save the assembling procedure of assembling insulation shell 410, Hard Magnetic pallet 230 and conducting rod, and the production and assembly efficiency of thermostat is greatly improved.
In practical application, for the first spring 500 is firmly connected with temperature-sensitive soft magnetism 210 with the second spring 700, as shown in Figure 5, temperature-sensitive soft magnetism 210 bottoms are provided with the first groove 211 of fixing the first spring 500 and the second groove 212 of fixing the second spring 700.PTC chip is close to temperature-sensitive soft magnetism bottom surface (form with printed circuit is printed on temperature-sensitive soft magnetism bottom surface) is set, and an electrode of PTC chip is placed in the first groove 211, and another electrode is placed in the second groove 212.The first spring 500 tops snap in the first groove 211 fixing, and the first spring top is connected with PTC chip conduction; The second spring 700 tops are inserted in the second groove 212 fixing, and the second spring 700 top conductive connect PTC chip.Pass through this setup, can well fix the first spring and the second spring on the one hand, avoid it in thermostat course of action, to be subjected to displacement, can guarantee on the other hand the stability that the first spring and the second spring are electrically connected to PTC chip, guarantee the normal steady operation in PTC heating loop.PTC chip is close to temperature-sensitive soft magnetism bottom surface and is arranged, when PTC heating loop works, PTC chip can directly heat temperature-sensitive soft magnetism, and its efficiency of heating surface is high, reliability is high, can guarantee that temperature-sensitive soft magnetism remains under Curie temperature state (guaranteeing that thermostat keeps off state).
By above-mentioned set-up mode, in miniature thermostat, formed a PTC heating loop (being the first terminal sheet 610-the first spring 500-PTC chip-the second spring 700-actuating strut 400-movable contact spring the 320-the second terminal plate 620 loops) that security and stability is high, referring to Fig. 3, A, B, C, D, E, F is 6 conduction connection bits in this PTC heating loop, wherein A is conductive rivet and the first terminal sheet connection bit, B is conductive rivet and the first spring connection bit, C is the first spring and PTC chip electrode connection bit, D is PTC chip electrode and the second spring connection bit, E is the second spring and conducting rod connection bit, F is conducting rod and movable contact spring connection bit.When thermostat is normally worked, this PTC heating loop disconnects, and thermostat work loop is not impacted, when excess Temperature, thermostat work loop disconnects, and PTC heating loop is connected the heating of temperature-sensitive soft magnetism, makes it keep Curie temperature, maintain the off-state of thermostat, until artificial power-off, temperature-sensitive soft magnetism temperature declines, with Hard Magnetic adhesive again, movable contact spring contacts again with fixed contact, and thermostat work loop is connected again.
The ingenious practicality of the utility model structure, each parts are produced simple, easy to assembly, its inner PTC heating circuit connects safety and stability, the long service life of thermostat, and work safety stability is high, sensitivity is high, is generally applicable to the multiple household products such as electric heater, electromagnetic oven, insulating pot, electric iron.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or convert, all these improvement and conversion all should belong to the protection range of the utility model claims.