CN101510483A

CN101510483A - Kick type temperature controller

Info

Publication number: CN101510483A
Application number: CNA200910096918XA
Authority: CN
Inventors: 朱英年; 方火峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-03-20
Filing date: 2009-03-20
Publication date: 2009-08-19
Anticipated expiration: 2029-03-20
Also published as: CN101510483B

Abstract

The invention relates to a snap-action temperature controller which comprises a shell body, a bimetallic strip, a contact pair and a drive device, wherein, the contact pair includes a static contact and a moving contact; the snap-action temperature controller is characterized in that the moving contact is electrically connected with a connecting terminal by a conducting strip; the conducting strip comprises a first reed and a second reed which are laminated together; when the drive device causes the contacts to be disconnected under the action of the flexural deformation of the bimetallic strip, the second reed directly leans against the drive device, in addition, the thickness of the second reed is between 0.1mm and 0.8mm while the proportion of the thickness of the first reed to the thickness of the second reed is between 1:4 to 1:1. Compared with the prior art, the temperature controller changes the conducting strip connecting the moving contact with the connecting terminal into a structure with two reeds laminated together; the double-reed structure increases the area of electrified section of the conducting strip, thereby improving the load bearing capability of the conducting strip, causing the temperature controller to be capable of bearing current as high as 50A and ensuring that the temperature controller can be connected with large-power load.

Description

Kick type temperature controller

Technical field

The present invention relates to a kind of thermostat, particularly a kind of Kick type temperature controller that adopts the dish-shape component made by bimetal leaf as temperature-sensing element.

Background technology

Usually, the contact that all is provided with loop conducting of the external electric heating of may command or disconnection in the thermostat is right, and this contact is to including moving contact and fixed contact.Usually; moving contact is realized being electrically connected by conducting strip and the binding post that is connected in the electric heating loop, under initial condition, if external electric heating loop is conducting; this moment, initiating contact and fixed contact contacted; when temperature raises, during the reverse kick of bimetal leaf, the bimetallic sector-meeting promotes the porcelain masthead and starts the contact; at this moment; moving contact separates with fixed contact, and the electric heating loop disconnects, thereby plays the effect of temperature control protection.

At present, the conducting strip that links to each other with moving contact mostly is the single reed that adopts beryllium-bronze material, as everyone knows, if increase the bearing capacity of thermostat, just need to increase the thickness of this single reed, and the increase of reed thickness can directly cause the pressure of this reed to increase, when bimetal leaf generation kick, the porcelain bar just may can't back down moving contact because reed pressure is excessive by the thrust of the kick generation of bimetal leaf, so, moving contact just can't in time separate with fixed contact and can cause the temperature control fails of thermostat, can have influence on the safe in utilization and life-span of outside electric equipment products.Yet, if do not increase the thickness of this single reed, then can't satisfy the load request of thermostat again to big electric current, make the properties of product of thermostat can not satisfy the customer requirement of the high-power index of this generic request, therefore, how to make thermostat can under the kick effect of bimetal leaf, realize normal temperature control action, satisfy demands for bearing capacity to big electric current again simultaneously and be our problem to be solved at present.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of current carrying capacity that can increase reed can avoid because of the excessive accurately Kick type temperature controller of this defective of temperature control of reed pressure at above-mentioned prior art present situation.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: this Kick type temperature controller includes

One housing is externally connected to the binding post that is connected in the electric heating loop;

One bimetal leaf is arranged in the described housing;

One contact is right, includes the fixed contact and the moving contact that are electrically connected with the binding post of outside respectively; And

One actuator under the effect of described bimetal leaf, makes described contact to closed or disconnection;

It is characterized in that: described moving contact is electrically connected by a conducting strip and described binding post, described conducting strip includes two first reeds that are superimposed up and down and second reed, when described actuator makes under the diastrophic effect of bimetal leaf under the state of described contact to disconnection, described second reed and described actuator directly offset, and, the thickness range of described second reed is 0.1～0.8mm, and the thickness proportion scope of the thickness of described first reed and this second reed is 1:4～1:1.

For conducting and the disconnection that realizes the electric heating loop, described actuator is the push rod that the center curvature face inside of an end and described bimetal leaf offsets, described binding post preferably adopts the switching configuration of single-pole single-throw(SPST formula, be specially: described binding post includes the first terminal and second terminal, under described moving contact and fixed contact contact condition, the loop conducting of described electric heating, when described moving contact under the described push rod effect and with described fixed contact released state under, described electric heating loop disconnects.

In order to reduce the size of thermostat effectively, make that the overall structure of thermostat is more compact, described first reed and second reed are two reeds that are flat shape, described housing offers cavity volume at the end that this first reed and second reed are installed, described contact is to being placed in this cavity volume, and, described first reed and second reed are fixedly linked at an end of the described moving contact of correspondence position, described first reed and second reed are fixedly linked at the other end of described first binding post of correspondence, and described fixed contact and described second terminal are electrically connected.

Described binding post also includes the 3rd terminal and the 4th terminal, described inner walls and bimetal leaf form a chamber, suspending in this chamber, at least one is close to described bimetal leaf and the heater established, this heater has pair of pins, and described pin two ends are fixedly connected on described the 3rd terminal that is used for this heater of conducting and an end of the 4th terminal respectively.Described heater generates heat after energising, can play the effect of constant temperature and thermal compensation to bimetal leaf, when the ambient temperature of thermostat product operate as normal reduces, heater can allow bimetal leaf obtain certain compensation power and guarantee that this bimetal leaf reaches the kick temperature of operate as normal in the part, thereby make thermostat can continue operate as normal, enlarged the scope of application of thermostat.

Described heating resistor is that power is the resistance of 0.5～5W, consider that power is big more, the heating temp of heating resistor is high more, can be also high more to the compensation temperature of thermostat bimetal leaf, and under equal-wattage, resistance with the selection large volume is good for convenient for assembly, simultaneously from cost consideration, the price of the large volume resistance also resistance than small size is more cheap, the present invention adopts the chamber of following structure to realize the installation of large volume heating resistor: the boss for swelling in the middle of the bottom surface of described chamber, this chamber is recessed cannelure around boss, this chamber has the through hole that connects with described housing on boss, described actuator can be located in this through hole, described heating resistor is suspended in the cannelure, and, also offer in the bottom of this cannelure and to run through housing and can hold described the 3rd terminal and slot that the 4th terminal passes.Because described chamber is a cannelure, spatial volume is bigger, can be fit to install the heating resistor of large volume, and under identical power conditions, large volume resistance is bought on market easily, and price is more cheap than small size resistance, has therefore reduced production cost.

In order to make full use of cavity space, and the raising heat efficiency, described heating resistor can have two, parallel respectively and be arranged on the both sides of described boss symmetrically, the pin two ends of each heating resistor are connected to an end of described the 3rd terminal and the 4th terminal, and the other end of the 3rd terminal and the 4th terminal passes described slot and vertically passes through stretches in outside the described housing.So, the 3rd terminal and the 4th terminal can wear by slot and be fixed in the housing, two heating resistors then are suspended in the chamber respectively, by regulating the distance of the 3rd terminal and the 4th terminal insertion housing, can correspondingly regulate the distance between heating resistor and the bimetal leaf, heating resistor from bimetal leaf and distance is near more, then the compensation heat that obtains of bimetal leaf is many more.

For seal casinghousing and reach the dustproof purpose, described housing also is connected with a bottom in a side that is equipped with described heating resistor, offers on this bottom to hold the slotted eye that described the 3rd terminal and the 4th terminal pass.

Can reliably locate when bottom top is inserted into housing in order to realize binding post, guarantee the distance between resistance and the bimetal leaf, described the 3rd terminal and the 4th terminal also are respectively arranged with a projection at the other end that passes described housing, and this projection offsets with the outer surface of described bottom and can be spacing at corresponding described slotted eye place.

In order to protect bimetal leaf in transportation and installation process, not to be damaged; guarantee simultaneously bimetal leaf temperature sensor variation in time again; but described housing is being equipped with the end cap that the right side in contact also is connected with a temperature-sensitive, and described bimetal leaf is arranged in the cavity of this temperature-sensitive end cap and housing formation.This temperature-sensitive end cap can the induction heat source temperature, and thermal source passed to bimetal leaf makes it reaching abrupt temp and the kick distortion takes place.

Compared with prior art, the invention has the advantages that: the conducting strip that the thermostat of this product will connect between moving contact and the binding post is improved to two mutual superposition double reed sheet structure together, this double reed sheet structure has increased the energising cross-sectional area of conducting strip, improved the bearing capacity of conducting strip, make the thermostat maximum can bear the electric current of 50A, guaranteed that thermostat can connect high power load; On the other hand, the conducting strip of double reed sheet structure can be avoided the excessive defective of reed pressure that causes because increase the thickness of single reed and cross section, having solved because reed pressure is excessive makes bimetal leaf can't normally push the problem of contact open, when improving the thermostat performance, guaranteed the operate as normal of thermostat product.

Description of drawings

Fig. 1 is the perspective view of the embodiment of the invention.

Fig. 2 is the three-dimensional exploded view of the embodiment of the invention.

Fig. 3 removes the vertical view of bottom for the embodiment of the invention.

Fig. 4 is that A-A shown in Figure 3 is to cutaway view (bimetal leaf is under the initial reset state).

Fig. 5 is A-A shown in Figure 3 to cutaway view (bimetal leaf oppositely kick state under).

Fig. 6 is that B-B shown in Figure 4 is to cutaway view.

Fig. 7 can't back down the schematic diagram of moving contact for the push rod of the embodiment of the invention.

Schematic diagram when Fig. 8 backs down moving contact for the push rod of the embodiment of the invention.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Thermostat of the present invention is applicable to boiler, water heater, dust catcher, photocopier, electric furnace, baking oven, dryer, refrigerator, air-conditioning, air compressor etc.As Fig. 1～shown in Figure 8, for the present invention is applied in specific embodiment on the dryer: include

Ceramic shell 1, this ceramic shell 1 is compared the bakelite housing can bear higher heating temp, is provided with in the housing 1 to be used to back down the slidably push rod 8 that the contact is used.

Bottom 2, an end that is connected housing 1 is to realize the end face seal to this housing 1, housing 1 offers cavity volume 11 in a side that is connected with bottom 2.

Top cover 3 is connected the other end of housing 1, but the Stainless Steel that this top cover 3 is temperature-sensitive lid can be realized heat transferred and to the protection of bimetal leaf.

Be connected on the binding post on the external electric heating loop, include the first terminal 41, second terminal 42, the 3rd terminal 43 and the 4th terminal 44.

Bimetal leaf 7 is arranged in the cavity that is formed by housing 1 and top cover 3 and near top cover 3 inboard settings, the center curvature face inside of an end of push rod 8 and bimetal leaf 7 offsets.

The contact is right, includes the moving contact 51 and the fixed contact 52 that are placed in housing 1 cavity volume, under the effect of bimetal leaf 7, makes the contact to closed or disconnection; Under moving contact 51 and fixed contact 52 contacted states, external electric heating loop conducting this moment, when moving contact 51 separated with fixed contact 52, this moment, external electric heating loop disconnected; Moving contact 51 links to each other with the first terminal 41 electricity by conducting strip 6, one end of conducting strip 6 is direct and moving contact 51 is fixing, the other end of conducting strip 6 by rivet 9 ' and the first terminal 41 be fixed on the housing 1, the other end that second terminal, 42 1 ends are fixed with fixed contact 52, the second terminals 42 is by rivet 9 ' be fixedly connected on the housing 1;

Wherein, conducting strip 6 includes two and is flat shape and first reed 61 that is superimposed up and down and second reed 62, second reed 62 is positioned at the inboard of first reed 61, when kick takes place in bimetal leaf 7, second reed 62 and push rod 8 directly offset, and first reed 61 and second reed 62 are fixedly linked at an end of corresponding moving contact 51 positions;

Here, in order to guarantee that thickness and proportionate relationship that push rod 8 can back down moving contact 51, the first reeds 61 and second reed 62 will meet some requirements.

The thickness of second reed 62 (i.e. the reed that can directly offset with push rod 8) is advisable with 0.1～0.8mm, when the thickness of second reed 62 during less than 0.1mm, at this moment, the thickness of conducting strip 6 is too thin, the insufficient strength of conducting strip 6, the energising back influences the performance of thermostat easily because caloric value is excessive; When the thickness of second reed 62 during greater than 0.8mm, at this moment, the thickness of the conducting strip of being made up of first reed 61 and second reed 62 6 is excessive, causes making bimetal leaf to back down moving contact 51 by push rod owing to reed pressure is excessive, referring to Fig. 7;

The thickness of first reed 61 is less than or equals the thickness of second reed 62, and in a suitable proportion, in the present embodiment, the thickness proportion scope of the thickness of first reed 61 and second reed 62 is 1:4～1:1, when the ratio of the thickness of the thickness of first reed 61 and second reed 62 during less than 1:4, at this moment, the thickness of first reed 61 is too thin, can't carry bigger electric current in actual applications, not play the effect after the two-man act sheet superposes; When the ratio of the thickness of the thickness of first reed 61 and second reed 62 during greater than 1:1, at this moment, the thickness of first reed 61 is greater than the thickness of second reed 62, because second reed 62 is the inboards that are positioned at first reed 61, push rod 8 when backing down moving contact 51 earlier and second reed 62 inconsistent, first reed, 61 thickness too conference to cause push rod 8 to back down the distance of moving contact 51 too small, cause contact sparking or arcing phenomenon, referring to Fig. 8, at this moment, second reed, 62 middle parts that are provided with near push rod 8 offset with first reed 61 under push rod 8 effects, heave because of the pressure effect of first reed 61 both sides of second reed 62, make that moving contact 51 and fixed contact 52 separating distances are too small, influence the serviceability of thermostat;

Therefore, the thickness of second reed 62 is preferably 0.1mm～0.8mm, and the ratio of the thickness of first reed 61 and second reed 62 is 1:4～1:1 (promptly the second reed thickness near push rod 8 is greater than first reed, 61 thickness that are superimposed upon top), as preferably, especially the thickness with first reed is 0.1mm, the thickness of second reed is that 0.4mm is an optimum value, can guarantee that push rod 8 backs down the contact smoothly when bimetal leaf 7 kicks.

Two heating resistors 9, next-door neighbour's bimetal leaf 7 is provided with, each heating resistor 9 has pair of pins 91, each pin 91 is fixedly connected on the 3rd terminal 43 that is used for this heating resistor of conducting and an end of the 4th terminal 44 respectively, present embodiment has adopted the high-precision metal film resistor as heating resistor 9, each heating resistor is that power is the large volume resistance of 0.5～5W, under identical power conditions, the price of the resistance of large volume wants cheap a lot of than small size resistance, and be welded to binding post and also can be more prone to, for the heating resistor that can give large volume provides sufficient installing space, convenient for assembly, the housing of present embodiment has designed following structure at the end that bimetal leaf 7 is installed:

Bimetal leaf 7 and housing 1 inwall form a chamber 12, this chamber 12 forms bossed boss 13 in the middle of housing 1 inwall, two symmetrical in parallel to each other both sides that are installed in boss 13 of resistance 9, around the boss 13 is recessed cannelure 14, chamber 12 has the through hole 131 that connects with housing 1 on boss 13, push rod 8 is located in the through hole 131 slidably; The other end that offers slot 141, the three terminals 43 that run through housing 1 and the 4th terminal 44 in the bottom of cannelure 14 can pass slot 141 and vertically pass through stretches in outside the housing 1;

So, heating resistor 9 just is suspended among the cannelure 14 of chamber 12 by the 3rd terminal 43 and the 4th terminal 44, and the distance between heating resistor 9 and the bimetal leaf 7 can be regulated according to the working temperature needs of actual electric equipment products, when heating resistor 9 is provided with near bimetal leaf 7, can improve the heating efficiency of resistance, can in the short time behind the resistance heating power, make bimetal leaf make the kick distortion.But that can not lean between heating resistor 9 and the bimetal leaf 7 is too near, needs the certain electric insulation distance of maintenance, otherwise punctures bimetal leaf possibly, causes the thermostat electric leakage;

So, housing 1 with ring channel structures can provide the sufficient space that suspends for heating resistor, make things convenient for the installation of large volume resistance, and adopt the housing 1 of ceramic material in the present embodiment, when resistor power is big, can guarantee the operate as normal of thermostat, housing compared with the bakelite material has better thermal conductivity, can prevent that housing is overheated.

Consider that heating resistor 9 is welded to pin on the 3rd terminal 43 and the 4th terminal 44 earlier when assembling, and then the 3rd terminal 43 and the 4th terminal 44 be installed in the thermostat housing 1, in order to guarantee the reliable location of binding post, guarantee that simultaneously heating resistor can be suspended among the chamber, on bottom 2, also offer and to hold the slotted eye 21 that the 3rd terminal 43 and the 4th terminal 44 pass, slotted eye 21 is corresponding with the slot 141 on the housing 1 respectively, the 3rd terminal 43 and the 4th terminal 44 also have first projection, 431 and second projection 441 respectively on the other end that passes housing 1, first projection, 431 and second projection 441 offsets with the outer surface of bottom 2 respectively and can be spacing at corresponding slotted eye 21 places, referring to Fig. 3, Fig. 6.

The thermostat operation principle of present embodiment is:

Under the normal temperature state, bimetal leaf 7 is in the initial reset state, and moving contact 51 is (promptly normally closed) that contact with fixed contact 52, and circuit turn-on is referring to Fig. 4;

Under heating resistor 9 no power states, when but the top cover 3 of temperature-sensitive is sensed on the limiting temperature that extraneous operating ambient temperature is elevated to bimetal leaf 7 (as 100 degree) in limited time, kick takes place in bimetal leaf 7, bimetal leaf 2 promotes push rod 8 and moves upward, and push rod 8 backs down the conducting strip of being made up of first reed 61 and second reed 62 6, thereby moving contact 51 is separated with fixed contact 52, the first terminal 41 and second terminal 42 open circuit, circuitry cuts, dryer quits work, referring to Fig. 5; When temperature reduced, kick took place in bimetal leaf 7 once more, is returned to initial condition, and push rod 8 moves downward under the deadweight effect, and conducting strip 6 falls simultaneously and makes moving contact 51 and fixed contact 52 closed again, and circuit recloses, but the dryer operate as normal.

When external working temperature changes, as being reduced to 70 degree by 100 original degree, at this moment, switch on to heating resistor, can produce the steady temperature of 30 degree after making it to generate heat, then when operating ambient temperature reached 70 degree, the kick distortion also can take place in bimetal leaf, cut off circuit, dryer quits work; When temperature reduced, bimetallic sector-meeting kick once more resetted, and circuit recloses.

Present embodiment is being provided with the high-precision metal film resistor near in housing one side cavity of bimetal leaf, make thermostat (when being working temperature decline) under the freezing weather of environment can guarantee that also the part of product reaches certain temperature, thereby reach the gentle preheating of weighing apparatus.On the other hand, the conducting strip of the duplex spring chip architecture of being made up of first reed and second reed early guarantees under the prerequisite of thermostat operate as normal that make the thermostat maximum can bear the electric current of 50A greatly, service behaviour is greatly improved.

Claims

1, a kind of Kick type temperature controller includes

One bimetal leaf is arranged in the described housing;

2, Kick type temperature controller according to claim 1, it is characterized in that: described actuator is the push rod that the center curvature face inside of an end and described bimetal leaf offsets, described binding post includes the first terminal and second terminal, under described moving contact and fixed contact contact condition, the loop conducting of described electric heating, when described moving contact under the described push rod effect and with described fixed contact released state under, described electric heating loop disconnects.

3, Kick type temperature controller according to claim 2, it is characterized in that: described first reed and second reed are two reeds that are flat shape, described housing offers cavity volume at the end that this first reed and second reed are installed, described contact is to being placed in this cavity volume, and, described first reed and second reed are fixedly linked at an end of the described moving contact of correspondence position, described first reed and second reed are fixedly linked at the other end of described first binding post of correspondence, and described fixed contact and described second terminal are electrically connected.

4, Kick type temperature controller according to claim 2, it is characterized in that: described binding post also includes the 3rd terminal and the 4th terminal, form a chamber between described inner walls and the bimetal leaf, this chamber suspends, and at least one is close to described bimetal leaf and the heater established, this heater has pair of pins, and described pin two ends are fixedly connected on described the 3rd terminal that is used for this heater of conducting and an end of the 4th terminal respectively.

5, Kick type temperature controller according to claim 4, it is characterized in that: described heater is that power bracket is the heating resistor of 0.5～5W, boss for swelling in the middle of the bottom surface of described chamber, this chamber is recessed cannelure around boss, this chamber has the through hole that connects with described housing on boss, described actuator can be located in this through hole, described heating resistor is suspended in the cannelure, and, also offer in the bottom of this cannelure and to run through housing and can hold described the 3rd terminal and slot that the 4th terminal passes.

6, Kick type temperature controller according to claim 5, it is characterized in that: described heating resistor has two, parallel respectively and be arranged on the both sides of described boss symmetrically, the pin two ends of each heating resistor are connected to an end of described the 3rd terminal and the 4th terminal, and the other end of the 3rd terminal and the 4th terminal passes described slot and vertically passes through stretches in outside the described housing.

7, Kick type temperature controller according to claim 6 is characterized in that: described housing also is connected with a bottom in a side that is equipped with described heating resistor, offers on this bottom to hold the slotted eye that described the 3rd terminal and the 4th terminal pass.

8, Kick type temperature controller according to claim 7, it is characterized in that: described the 3rd terminal and the 4th terminal also are respectively arranged with a projection at the other end that passes described housing, and this projection offsets with the outer surface of described bottom and can be spacing at corresponding described slotted eye place.

9, according to the described Kick type temperature controller of arbitrary claim in the claim 1～8, it is characterized in that: but described housing is being equipped with the end cap that the right side in contact also is connected with a temperature-sensitive, and described bimetal leaf is arranged in the cavity of this temperature-sensitive end cap and housing formation.