CN102693879A - Thermal actuator and relay - Google Patents
Thermal actuator and relay Download PDFInfo
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- CN102693879A CN102693879A CN2011100680228A CN201110068022A CN102693879A CN 102693879 A CN102693879 A CN 102693879A CN 2011100680228 A CN2011100680228 A CN 2011100680228A CN 201110068022 A CN201110068022 A CN 201110068022A CN 102693879 A CN102693879 A CN 102693879A
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Abstract
The invention discloses a thermal actuator comprising a magnetic control unit, a magnetic flux control unit, a thermal detection unit and a first soft magnetic element. The magnetic control unit comprises a permanent magnet and a second soft magnetic element. The magnetic flux control unit comprises a magnetostrictive element and a shape memory alloy element, wherein the shape memory alloy element is attached to the outside of the magnetostrictive element. The magnetic flux control unit and the magnetic control unit form a first magnetic circuit, and the first soft magnetic element and the magnetic control unit form a second magnetic circuit. The thermal detection unit gets heat from outside to heat the shape memory alloy element. When the temperature of the shape memory alloy element is greater than the transition temperature, the shape memory alloy element applies pressure to the magnetostrictive element, so that the magnetic flux of the first magnetic circuit is smaller than the magnetic flux of the second magnetic circuit, and the first soft magnetic element is attracted to the second soft magnetic element. Additionally, the invention also discloses a relay. The thermal actuator and the relay provided in the embodiments of the invention can provide reliable overload protection to electrical equipment in various industrial environments.
Description
Technical field
The present invention relates to the Electrical Control Technology field, be specifically related to a kind of thermal actuator and relay.
Background technology
Overload relay (overload relay) is a kind of electric switch, is mainly used in the protection electric equipment, prevents the mistake cause thermal damage electric equipment that overcurrent causes.For example, when overload takes place motor, the electric current in the motor winding will increase, and the winding temperature of motor is raise.Through the operating overload relay, can in time break off the power supply of motor, prevent that the too high motor winding that causes of temperature from burning.
At present, the overload relay that in practical application, generally adopts comprises bimetal relay (bimetallic-based relay) and based on the relay (circuit-based relay) of circuit.
Comprise two kinds of coefficient of expansion different metallic sheets in the bimetal relay, when the electric current that passes through heater element was excessive, the heat that heating produces made the bimetal leaf heated bending, thereby promoted driving mechanism, made the contact action, and circuit is broken off.But, because the rigidity of bimetal leaf is lower, occurs mechanical oscillation in actual shipment or the application process and be easy to make bimetal leaf to resonate, finally damage bimetal relay.In addition, bimetal relay can't detect the numerical value of electric current or heat, so bimetal relay can not accurately determine when open circuit.
Relay based on circuit comprises microprocessor, can pass through attached to the phase conductor on the motor (phase conductor) monitor current, and estimate temperature according to the sampled value of electric current.When the temperature of estimating during greater than predetermined value, circuit is broken off in microprocessor control contact action.But (Electro Magnetic Interference, influence EMI) reduce the reliability based on the relay of circuit owing to receive electromagnetic interference easily based on the electric component in the relay of circuit.In addition, generally include power circuit based on the relay of circuit, therefore the interference to power circuit can influence the reliability based on the relay of circuit equally.
It is thus clear that there is above-mentioned shortcoming in existing relay like bimetal relay with based on the relay of circuit, therefore in the commercial Application of reality, especially in abominable industrial environment, the reliability of existing relay is not high enough.
Summary of the invention
The embodiment of the invention provides a kind of thermal actuator and a kind of relay, can being that electric equipment provides reliable overload protection in various industrial environments.
In order to solve the problems of the technologies described above, the embodiment of the invention provides following technical scheme.
A kind of implementation method of the present invention provides a kind of thermal actuator, comprising:
The magnetic force control unit, flux regulator unit, the hot-probing unit and first soft magnetic components; Wherein, said magnetic force control unit comprises the permanent magnet and second soft magnetic components, and said flux regulator unit comprises magnetic hysteresis telescopic element and shape memory alloy component; Said shape memory alloy component is attached to the outside of said magnetic hysteresis telescopic element; Said flux regulator unit and said magnetic force control unit form first magnetic circuit; Said first soft magnetic components and said magnetic force control unit form second magnetic circuit;
Said hot-probing unit is used for obtaining heat from the outside, and heats said shape memory alloy component;
Said shape memory alloy component, is exerted pressure to said magnetic hysteresis telescopic element during greater than the transition temperature in self temperature, makes the magnetic flux of the magnetic flux of said first magnetic circuit less than said second magnetic circuit;
When the magnetic flux of said first magnetic circuit during less than the magnetic flux of said second magnetic circuit, said first soft magnetic components and the said second soft magnetic components adhesive.
In one embodiment of the present invention, said hot-probing unit comprises:
The first hot-probing module is used for obtaining heat from external circuit; And/or
The second hot-probing module is used for obtaining heat from external environment condition.
In one embodiment of the present invention, said hot-probing unit comprises heater coil, and said heater coil is wrapped on the said shape memory alloy component; Perhaps, said hot-probing unit comprises thermal resistance; Said thermal resistance is attached on the said shape memory alloy component.
In one embodiment of the present invention; Said permanent magnet constitutes a groove; Said second soft magnetic components comprises first and second portion; One end of said permanent magnet links to each other with an end of said first, and the other end of said permanent magnet links to each other with an end of said second portion, and the two ends of said magnetic hysteresis telescopic element link to each other with said second portion with said first respectively.
In one embodiment of the present invention, said second soft magnetic components is attached to the periphery of said permanent magnet, and forms groove with said permanent magnet, and said magnetic hysteresis telescopic element is positioned at said groove, is connected with said second soft magnetic components.
In one embodiment of the present invention; Said permanent magnet is divided into two parts; Said second soft magnetic components comprises first; Second portion and third part, the two ends of the first of said second soft magnetic components connect first end of two parts of said permanent magnet respectively, and the second portion of said second soft magnetic components links to each other with second end of a part of said permanent magnet; The third part of said second soft magnetic components links to each other with second end of another part of said permanent magnet, and said magnetic hysteresis telescopic element links to each other with third part with the said second portion of said second soft magnetic components.
In one embodiment of the present invention, said shape memory alloy component surrounds said magnetic hysteresis telescopic element.
One embodiment of the present invention provide a kind of relay; Comprise: above-mentioned thermal actuator; The bracelet element, insulation component, conducting element and at least two circuit contacts; Said bracelet element contacts with second soft magnetic components with first soft magnetic components of said thermal actuator, and said conducting element is connected with said first soft magnetic components through said insulation component;
Said at least two circuit contacts are connected with external circuit;
When said first soft magnetic components separates with said second soft magnetic components; Said conducting element contacts with said two circuit contacts at least; And when said first soft magnetic components and the said second soft magnetic components adhesive, said conducting element separates with said two circuit contacts at least.
In one embodiment of the present invention; At least one circuit contact in said at least two circuit contacts links to each other with the power supply of said external circuit, and another circuit contact at least in said at least two circuit contacts links to each other with the electric equipment of said external circuit.
In one embodiment of the present invention, connect with said external circuit in said hot-probing unit.
In one embodiment of the present invention, said relay also comprises: reset cell is used to separate said first soft magnetic components and second soft magnetic components that are in attracting state.
In one embodiment of the present invention, said reset cell comprise the replacement button and with the said replacement button replacement mechanism that is rigidly connected,
Said replacement button, being used for when being pressed is that said replacement mechanism provides Mechanical Driven power;
Said replacement mechanism is used to be used to said first soft magnetic components that Mechanical Driven power from said replacement button will be in attracting state and separates with second soft magnetic components.
Thermal actuator that the embodiment of the invention provides and relay have following advantage.
At first; In thermal actuator and relay that the embodiment of the invention provides; When shape memory alloy component is heated to self temperature greater than the transition temperature, the magnetic hysteresis telescopic element is exerted pressure, the variation through magnetic flux makes first soft magnetic components and the second soft magnetic components adhesive; Need not microprocessor or power circuit, therefore can be by from the EMI of outside with from the interference effect of power circuit.
Secondly, the rigidity of each assembly is all higher in thermal actuator in the embodiment of the invention and the relay, can be good at resisting outside mechanical oscillation.
Further, deformation only just can take place in the shape memory alloy component in the embodiment of the invention when self temperature is higher than the transition temperature, thereby the magnetic hysteresis telescopic element is exerted pressure.Therefore can select the shape memory alloy component of different transition temperature as required, thereby temperature value or current value when confirming open circuit accurately determine when open circuit.
Further; The thermal actuator in the embodiment of the invention and the mechanical structure of relay are simpler; And the stroke of second soft magnetic components is longer, need not to use special driving mechanism to amplify stroke and just can make the contact action, and circuit is broken off; Further avoid the generation of mechanical fatigue, improved the reliability of thermal actuator and relay.
In addition, use thermal actuator and relay in the embodiment of the invention, the damage that not only can avoid electric equipment overload to cause can not reduce external equipment and environmental impact outside release heat simultaneously.And, when external environment condition is too high, also can cut off circuit, avoided the generation of fire.
Description of drawings
Fig. 1 is the sketch map of the structure of thermal actuator in the embodiment of the invention.
Fig. 2 be in the embodiment of the invention thermal actuator at the sketch map of the magnetic flux distribution of opening state.
Fig. 3 is the sketch map of thermal actuator magnetic flux distribution in a certain moment in the process that gets into closed condition in the embodiment of the invention.
Fig. 4 is the sketch map of embodiment of the invention repeat circuit in the structure of opening state.
Fig. 5 is the sketch map of embodiment of the invention repeat circuit structure in off position.
Fig. 6 is the sketch map of structure that comprises the relay of reset cell in the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below for example to embodiment of the invention further explain.
The thermal actuator that the embodiment of the invention provides comprises the magnetic force control unit, flux regulator unit, hot-probing unit and first soft magnetic components.Wherein, this magnetic force control unit comprises the permanent magnet and second soft magnetic components, and this flux regulator unit comprises magnetic hysteresis telescopic element and shape memory alloy component.Wherein, shape memory alloy component is attached to the outside of magnetic hysteresis telescopic element; Flux regulator unit and magnetic force control unit form first magnetic circuit, and first soft magnetic components and magnetic force control unit form second magnetic circuit.The hot-probing unit is used for obtaining heat from the outside, and heats this shape memory alloy component; This shape memory alloy component is in self temperature during greater than the transition temperature; Exert pressure to this magnetic hysteresis telescopic element, the magnetic resistance of magnetic hysteresis telescopic element is increased, when the magnetic flux of first magnetic circuit during less than the magnetic flux of second magnetic circuit; First soft magnetic components and the second soft magnetic components adhesive, thus drive actions is provided.
Through accompanying drawing the embodiment of the invention is elaborated below.
Fig. 1 shows the sketch map of the structure of thermal actuator in the embodiment of the invention.As shown in Figure 1, this thermal actuator comprises magnetic force control unit 10, flux regulator unit 11, hot-probing unit 12 and first soft magnetic components 13.Wherein, this magnetic force control unit 10 comprises the permanent magnet 101 and second soft magnetic components 102, and this flux regulator unit 11 comprises magnetic hysteresis telescopic element 111 and shape memory alloy component 112.
In the present embodiment, permanent magnet 101 can be cuboid or cylinder, and correspondingly, the cross section of second soft magnetic components 102 is cuboid or cylinder.As shown in Figure 1, the U type that is shaped as of magnetic force control unit 10, second soft magnetic components 102 be attached to the periphery of permanent magnet 101, and form grooves with permanent magnet 101, and magnetic hysteresis telescopic element 111 is positioned at this groove and is connected with second soft magnetic components 102.Preferably, permanent magnet 101 is divided into two parts, and second soft magnetic components 102 is divided into three parts, and respectively attached to the periphery of two parts of permanent magnet 101.Particularly; The two ends of the first of second soft magnetic components 102 link to each other respectively with first end of two parts of permanent magnet 101; The second portion of second soft magnetic components 102 links to each other with second end of a part of permanent magnet 101, and the third part of second soft magnetic components 102 links to each other with second end of another part of permanent magnet 101.Flux regulator unit 11 is arranged in the groove that magnetic force control unit 10 forms, and wherein magnetic hysteresis telescopic element 111 is connected with second soft magnetic components 102, and preferably, magnetic hysteresis telescopic element 111 links to each other with third part with the second portion of second soft magnetic components 102 respectively.
Magnetic force control unit 10 shown in Figure 1 is a preferable examples of the present invention; In practical application; Magnetic force control unit 10 also can adopt other structures; First like above-mentioned second soft magnetic components 102 also can be a permanent magnet, and promptly magnetic force control unit 10 comprises that self shape constitutes the permanent magnet 101 of groove and attached to second soft magnetic components 102 at permanent magnet two ends.
Shape memory alloy component 112 surrounds magnetic hysteresis telescopic element 111, and hot-probing unit 12 is connected with shape memory alloy component 112, and it is heated.It is thus clear that in the present embodiment, flux regulator unit 11 forms first magnetic circuit with magnetic force control unit 10; First soft magnetic components, 13 magnetic force control units 10 form second magnetic circuit.
Particularly, the effect of magnetic line of force transmission is only played in first soft magnetic components 13 in the present embodiment and second soft magnetic components 102 not production magnetic field itself in magnetic circuit.In practical application, second soft magnetic components 102 can be bar (yoke).
Hot-probing unit 12 can obtain heat from the outside.Particularly, hot-probing unit 12 can comprise the first hot-probing module, is used for obtaining heat from external circuit.For example, when connecting with external circuit, the temperature of hot-probing unit 12 is directly proportional with the electric current that flows through this hot-probing unit 12, thereby hot-probing unit 12 can obtain heat from this external circuit.In practical application, hot-probing unit 12 can be a heater coil, is wrapped on the shape memory alloy component 112; Perhaps hot-probing unit 12 can be a thermal resistance, on shape memory alloy component 112.In addition, hot-probing unit 12 can also comprise the second hot-probing module, is used for directly obtaining heat from external environment condition.For example, hot-probing unit 12 can obtain heat directly through heat conducting mode from surrounding environment.
In an embodiment; The magnetic permeability of magnetic hysteresis telescopic element 111 is big more a lot of than the space, and according to reverse magnetic hysteresis flex effect, when pressure is applied to 111 last times of magnetic hysteresis telescopic element; The magnetic permeability of magnetic hysteresis telescopic element 111 reduces along with the increase of this pressure; Be that magnetic resistance increases, thereby the magnetic line of force of first magnetic circuit is reduced, magnetic flux reduces.When applied pressure was released, the magnetic permeability of magnetic hysteresis telescopic element 111 increased, and promptly magnetic resistance reduces, thereby the magnetic line of force of first magnetic circuit is increased, and magnetic flux raises.
As shown in Figure 1, the magnetic hysteresis telescopic element 111 in the present embodiment is cuboids, and shape memory alloy component 112 can be attached to the one side at least of magnetic hysteresis telescopic element 111.Preferably, for magnetic hysteresis telescopic element 111 is applied uniform convergent force, shape memory alloy component 112 surrounds magnetic hysteresis telescopic element 111, promptly on 4 faces attached to this magnetic hysteresis telescopic element 111.In the present embodiment, marmem 140 can be attached to around the magnetic hysteresis telescopic element 111.In addition, the magnetic hysteresis telescopic element 111 in the present embodiment can also be a cylinder, and shape memory alloy component 112 surrounds magnetic hysteresis telescopic element 111, and promptly the cross section of this shape memory alloy component 112 is an annular.
In practical application, magnetic hysteresis telescopic element 111 can be giant magnetostrictive material (TERFENOL-D).Above-mentioned is an example of the present invention, when embodiment of the present invention, can also use other materials as magnetic hysteresis telescopic element 111.
Because shape memory alloy component 112 has shape memory function, it is used to provide the pressure that is applied on the magnetic hysteresis telescopic element 111.When being heated to the transition temperature; Shape memory alloy component 112 can promptly return to original shape; And before being heated to the transition temperature, shape memory alloy component 112 can not expand because of being heated; Therefore can not exert pressure yet, can not cause misoperation magnetic hysteresis telescopic element 111.In practical application, shape memory alloy component 112 can be copper-zinc-aluminum-nickel alloy, copper-aluminum-nickel alloy, perhaps Ni-Ti alloy.Above-mentioned is an example of the present invention, when embodiment of the present invention, can also use other materials as shape memory alloy component 112.
It will be appreciated by those skilled in the art that; The embodiment of the invention mainly is to apply power through 112 pairs of magnetostriction elements 111 of shape memory alloy component; And cause the magnetic permeability of magnetostriction element 111 to change, thereby change the magnetic flux in first magnetic circuit and second magnetic circuit.Therefore, when the practical implementation embodiment of the invention, other building modes that can realize above-mentioned functions are also in protection scope of the present invention.
Below based on thermal actuator shown in Figure 1, the course of work of the thermal actuator in the embodiment of the invention is described.
Fig. 2 shows in the embodiment of the invention thermal actuator at the sketch map of the magnetic flux distribution of opening state.In the present embodiment, shape memory alloy component 112 is heated to transition temperature state before, the state when promptly first soft magnetic components 13 separates with second soft magnetic components 102 is as the opening state of this thermal actuator.
As shown in Figure 2, flux regulator unit 11 forms first magnetic circuit with magnetic force control unit 10; First soft magnetic components 13 forms second magnetic circuit through space and magnetic force control unit 10.When thermal actuator was in opening state, if the heat that hot-probing unit 12 obtains from the outside can't be heated to its transition temperature with shape memory alloy component 112, then shape memory alloy component 112 can not exerted pressure to magnetic hysteresis telescopic element 111.At this moment, because the magnetic permeability of magnetic hysteresis telescopic element 111 is more much higher than the space, the magnetic flux of first magnetic circuit is more much bigger than the magnetic flux of second magnetic circuit.So, the magnetic force between the permanent magnet 101 and first soft magnetic components 13 is very little, thereby makes first soft magnetic components 13 and second soft magnetic components 102 keep released state.
Fig. 3 shows the sketch map of thermal actuator magnetic flux distribution in a certain moment in the process that gets into closed condition in the embodiment of the invention.
In the present embodiment, shape memory alloy component 112 is heated to transition temperature state afterwards, i.e. state during first soft magnetic components 13 and 102 adhesives of second soft magnetic components is as the closed condition of this thermal actuator.
As shown in Figure 3; When the heat that obtains from the outside when hot-probing unit 12 is heated to its transition temperature with shape memory alloy component 112; Deformation takes place in shape memory alloy component 112, and magnetic hysteresis telescopic element 111 is exerted pressure, and the magnetic permeability of magnetic hysteresis telescopic element 111 is reduced.Correspondingly, the magnetic resistance of first magnetic circuit increases, and the magnetic flux of second magnetic circuit increases.So, the magnetic force between the permanent magnet 101 and first soft magnetic components 13 increases, and first soft magnetic components 13 moves to permanent magnet 101.Shown in Fig. 3 is the sketch map in first soft magnetic components 13 a certain moment in the process that permanent magnet 101 moves; Minimizing along with the space between first soft magnetic components 13 and second soft magnetic components 102; The magnetic flux of second magnetic circuit constantly increases, up to first soft magnetic components 13 and 102 adhesives of second soft magnetic components.
It is thus clear that the thermal actuator that the embodiment of the invention provides need not microprocessor or power circuit when drive actions is provided, therefore can be by from the EMI of outside with from the interference effect of power circuit; And the hardness of each element is all higher in the thermal actuator in the embodiment of the invention, the mechanical shock that opposing that can be very high is outside; Further, when using, the transition temperature of selected shape memory alloy element as required, thus confirm to provide opportunity of drive actions; Simultaneously, the mechanical structure of the thermal actuator in the embodiment of the invention is simpler, and can avoid the generation of mechanical fatigue, has improved the reliability of thermal actuator and relay; In addition, the thermal actuator that the embodiment of the invention provides can not reduce the influence to external equipment and environment to outside release heat; And when the temperature of external environment condition reached the transition temperature of marmem, the thermal actuator that the embodiment of the invention provides also can provide drive actions, avoids the generation of fire.
Based on the drive actions of thermal actuator in the embodiment of the invention, can realize the function of relay.First soft magnetic components 13 is connected with circuit contact, just can utilizes the drive actions of thermal actuator, circuit is broken off.
The embodiment of the invention also provides a kind of relay, comprises above-mentioned thermal actuator, bracelet element, insulation component, conducting element and at least two circuit contacts.This bracelet element contacts with second soft magnetic components with first soft magnetic components of thermal actuator.This conducting element is connected with this first soft magnetic components through this insulation component.At least two circuit contacts are connected with the circuit that needs protection, like series connection.Particularly, at least one circuit contact in these at least two circuit contacts links to each other with the power supply of external circuit, and another circuit contact at least in these at least two circuit contacts links to each other with the electric equipment of external circuit.When first soft magnetic components separated with said second soft magnetic components, at least two circuit contacts of conducting element and this contacted, and when first soft magnetic components and the second soft magnetic components adhesive, at least two circuit contacts of conducting element and this separate.In practical application, the quantity of circuit contact can be provided with according to the needs of side circuit.
Below in conjunction with accompanying drawing, the course of work of the relay that the embodiment of the invention is provided is elaborated.
Fig. 4 shows the structure of embodiment of the invention repeat circuit at opening state.In the present embodiment, the quantity of circuit contact is two, and the state when conducting element is connected with two circuit contacts is the opening state of relay.
As shown in Figure 4, this relay comprises thermal actuator, bracelet element 14, insulation component 15, conducting element 16 and two circuit contacts 17.
In embodiments of the present invention, bracelet element 14 comprises spring 141 and slide block 142 at least.When first soft magnetic components separates with second soft magnetic components; This spring 141 is exerted pressure to first soft magnetic components through slide block 142; Not only make first soft magnetic components and second soft magnetic components keep released state, conducting element 16 is closely contacted with two circuit contacts 17.At first soft magnetic components in the process that second soft magnetic components moves; Spring 141 to the first soft magnetic components applied pressure less than the magnetic force between the permanent magnet and first soft magnetic components; Therefore spring 141 is compressed; Slide block 142 moves to the outside of first soft magnetic components, and first soft magnetic components slides to second soft magnetic components.Fig. 4 only shows an example of bracelet element 14 in the embodiment of the invention, when using present embodiment, can also adopt the bracelet with other structures, does not influence enforcement of the present invention.
In the present embodiment; Two circuit contacts 17 are between the power supply and electric equipment of external circuit; Thereby when overload takes place in external circuit, through two circuit contacts 17 can the disconnecting external circuit in connection between power supply and the electric equipment, play the effect of overload protection.In practical application, two circuit contacts 17 also can be connected on other positions of external circuit, do not influence enforcement of the present invention.
In the present embodiment, thermal detector is connected with external circuit, so; When external circuit does not transship, when promptly the current value in the external circuit was not greater than predetermined value, the shortage of heat that the electric current of this thermal detector of flowing through produces was so that the temperature of shape memory alloy component reaches its transition temperature; Therefore the magnetic flux of first magnetic circuit is greater than the magnetic flux of second magnetic circuit; First soft magnetic components and second soft magnetic components keep released state, and conducting element is connected with two circuit contacts, is communicated with between power supply in the external circuit and the electric equipment; Thereby make the external circuit operate as normal, relay is in opening state.
Fig. 5 shows embodiment of the invention repeat circuit structure in off position.State when in the present embodiment, conducting element 16 breaks off with circuit contact 17 is the closed condition of relay.
When external circuit transships; Be that current value in the external circuit is during greater than predetermined value; The heat that the electric current of thermal detector of flowing through produces makes the temperature of shape memory alloy component reach its transition temperature, thereby makes shape memory alloy component generation deformation, and the magnetic hysteresis telescopic element is exerted pressure.According to the operation principle of foregoing thermal actuator, because the magnetic resistance of magnetic hysteresis telescopic element reduces, the magnetic flux of second magnetic circuit increases.When the magnetic force between the permanent magnet and first soft magnetic components during greater than the pressure of bracelet element 14, first soft magnetic components moves to the direction of second soft magnetic components.Along with reducing of space, the magnetic resistance of second magnetic circuit reduces, and the magnetic flux of second magnetic circuit further increases, and the magnetic force between the permanent magnet and first soft magnetic components further increases, up to first soft magnetic components and the second soft magnetic components adhesive.Fig. 5 shows relay structure and magnetic flux distribution in off position.As shown in Figure 5, first soft magnetic components and the second soft magnetic components adhesive, conducting element 16 separates with two circuit contacts 17, is connected thereby power supply and electric equipment in the external circuit broken off, thereby plays the effect of overload protection.
Can find out that from the foregoing description the relay that the embodiment of the invention provides does not comprise microprocessor or power circuit, therefore can be by from the EMI of outside with from the interference effect of power circuit.And the hardness of each element is all higher in the embodiment of the invention repeat circuit, the mechanical shock that opposing that can be very high is outside.In addition; Deformation only just can take place in the shape memory alloy component in the relay when self temperature is higher than the transition temperature; Therefore the transition temperature of selected shape memory alloy element as required, thus temperature value or current value when confirming open circuit accurately determine when open circuit.Further; The mechanical structure of embodiment of the invention repeat circuit is simpler; And the stroke of second soft magnetic components is longer, need not to use special driving mechanism to amplify stroke and just can make the contact action, and circuit is broken off; Further avoid the generation of mechanical fatigue, improved the reliability of thermal actuator and relay.In addition, use the relay in the embodiment of the invention, the damage that not only can avoid electric equipment overload to cause can not reduce external equipment and environmental impact outside release heat simultaneously.Too high when the temperature of external environment condition, when reaching the transition temperature of marmem, the relay that the embodiment of the invention provides also can open circuit, has avoided the generation of fire.
For relay can be reused, relay in embodiments of the present invention further comprises reset cell 60.As shown in Figure 6, this reset cell 60 comprises replacement button 610 and the replacement mechanism 620 that is connected with this replacement button 610.Replacement button 610 can provide Mechanical Driven power for replacement mechanism after being pressed; First soft magnetic components that replacement mechanism 620 the Mechanical Driven power from this replacement button 610 of being used to will be in attracting state separates with second soft magnetic components; Make relay recovery to opening state, continue this circuit is protected.The reset cell 60 that present embodiment provides has advantage simple in structure, easy to operate.Fig. 6 only shows an example of reset cell, in practical application, also can adopt the reset cell 60 of other structures, does not influence enforcement of the present invention.
The invention discloses a kind of thermal actuator, comprise the magnetic force control unit, flux regulator unit, hot-probing unit and first soft magnetic components.The magnetic force control unit comprises the permanent magnet and second soft magnetic components, and the flux regulator unit comprises magnetic hysteresis telescopic element and shape memory alloy component; Shape memory alloy component is attached to the magnetic hysteresis telescopic element outside; Flux regulator unit and magnetic force control unit form first magnetic circuit; First soft magnetic components and magnetic force control unit form second magnetic circuit; The hot-probing unit obtains heat from the outside, and the heating shape memory alloy component; Shape memory alloy component, is exerted pressure to the magnetic hysteresis telescopic element during greater than the transition temperature in self temperature, makes the magnetic flux of the magnetic flux of first magnetic circuit less than second magnetic circuit, first soft magnetic components and the second soft magnetic components adhesive.In addition, the invention also discloses a kind of relay.Thermal actuator that the embodiment of the invention provides and relay can provide reliable overload protection for electric equipment in various industrial environments.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.Can be in concrete implementation process to carrying out suitable improvement according to a preferred embodiment of the invention, to adapt to the concrete needs of concrete condition.Therefore be appreciated that embodiment of the present invention as herein described just plays an exemplary role, not in order to restriction protection scope of the present invention.
Claims (12)
1. thermal actuator, said thermal actuator comprises:
Magnetic force control unit (10), flux regulator unit (11), hot-probing unit (12) and first soft magnetic components (13); Wherein, said magnetic force control unit (10) comprises permanent magnet (101) and second soft magnetic components (102), and said flux regulator unit (11) comprises magnetic hysteresis telescopic element (111) and shape memory alloy component (112); Said shape memory alloy component (112) is attached to the outside of said magnetic hysteresis telescopic element (111); Said flux regulator unit (11) forms first magnetic circuit with said magnetic force control unit (10); Said first soft magnetic components (13) forms second magnetic circuit with said magnetic force control unit (10);
Said hot-probing unit (12) is used for obtaining heat from the outside, and heats said shape memory alloy component (112);
Said shape memory alloy component (112), is exerted pressure to said magnetic hysteresis telescopic element (111) during greater than the transition temperature in self temperature, makes the magnetic flux of the magnetic flux of said first magnetic circuit less than said second magnetic circuit;
When the magnetic flux of said first magnetic circuit during less than the magnetic flux of said second magnetic circuit, said first soft magnetic components (13) and said second soft magnetic components (102) adhesive.
2. thermal actuator according to claim 1, wherein, said hot-probing unit comprises:
The first hot-probing module is used for obtaining heat from external circuit; And/or
The second hot-probing module is used for obtaining heat from external environment condition.
3. thermal actuator according to claim 1, wherein,
Said hot-probing unit (12) comprises heater coil, and said heater coil is wrapped on the said shape memory alloy component (112); Perhaps
Said hot-probing unit (12) comprises thermal resistance; Said thermal resistance is attached on the said shape memory alloy component (112).
4. thermal actuator according to claim 1; Wherein, Said permanent magnet (101) constitutes a groove, and said second soft magnetic components (102) comprises first and second portion, and an end of said permanent magnet (101) links to each other with an end of said first; The other end of said permanent magnet (101) links to each other with an end of said second portion, and the two ends of said magnetic hysteresis telescopic element (111) link to each other with said second portion with said first respectively.
5. thermal actuator according to claim 1; Wherein, Said second soft magnetic components (102) is attached to the periphery of said permanent magnet (101); And forming groove with said permanent magnet (101), said magnetic hysteresis telescopic element (111) is positioned at said groove, is connected with said second soft magnetic components (102).
6. thermal actuator according to claim 5; Wherein, Said permanent magnet (101) is divided into two parts; Said second soft magnetic components (102) comprises first; Second portion and third part, the two ends of the first of said second soft magnetic components (102) connect first end of two parts of said permanent magnet (101) respectively, and the second portion of said second soft magnetic components (102) links to each other with second end of a part of said permanent magnet (101); The third part of said second soft magnetic components (102) links to each other with second end of another part of said permanent magnet (101), and said magnetic hysteresis telescopic element (111) links to each other with third part with the said second portion of said second soft magnetic components (102).
7. thermal actuator according to claim 1, wherein, said shape memory alloy component (112) surrounds said magnetic hysteresis telescopic element (111).
8. relay; Said relay comprises: like each described thermal actuator in the claim 1 to 7; Bracelet element (14), insulation component (15), conducting element (16) and at least two circuit contacts (17); Said bracelet element (14) contacts with second soft magnetic components (102) with first soft magnetic components (13) of said thermal actuator, and said conducting element (16) is connected with said first soft magnetic components (13) through said insulation component (15);
Said at least two circuit contacts (17) are connected with external circuit;
When said first soft magnetic components (13) and said second soft magnetic components (102) when separating; Said conducting element (16) contacts with said two circuit contacts (17) at least; And when said first soft magnetic components (13) and said second soft magnetic components (102) adhesive, said conducting element (16) separates with said two circuit contacts (17) at least.
9. relay according to claim 8; Wherein, At least one circuit contact (17) in said at least two circuit contacts (17) links to each other with the power supply of said external circuit, and another circuit contact at least (17) in said at least two circuit contacts (17) links to each other with the electric equipment of said external circuit.
10. relay according to claim 8, wherein, connect with said external circuit in said hot-probing unit (12).
11. relay according to claim 8, wherein, said relay also comprises: reset cell (60) is used to separate said first soft magnetic components (13) and second soft magnetic components (102) that are in attracting state.
12. relay according to claim 11, wherein, said reset cell comprise replacement button (610) and with the said replacement button replacement mechanism (620) that is rigidly connected,
Said replacement button (610), being used for when being pressed is that said replacement mechanism provides Mechanical Driven power;
Said replacement mechanism (620) is used to be used to said first soft magnetic components (13) that Mechanical Driven power from said replacement button (610) will be in attracting state and separates with second soft magnetic components (102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100680228A CN102693879A (en) | 2011-03-21 | 2011-03-21 | Thermal actuator and relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100680228A CN102693879A (en) | 2011-03-21 | 2011-03-21 | Thermal actuator and relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102693879A true CN102693879A (en) | 2012-09-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100680228A Pending CN102693879A (en) | 2011-03-21 | 2011-03-21 | Thermal actuator and relay |
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| Country | Link |
|---|---|
| CN (1) | CN102693879A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103916A (en) * | 2020-10-19 | 2020-12-18 | 单奇 | Detection type overcurrent protection device convenient to judge |
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| US20080197208A1 (en) * | 2003-02-27 | 2008-08-21 | University Of Washington | Membrane actuator based on ferromagnetic shape memory alloy composite for synthetic jet actuator |
| CN101626202A (en) * | 2008-07-11 | 2010-01-13 | 杨锦堂 | Magnetostrictor actuator |
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| US20080197208A1 (en) * | 2003-02-27 | 2008-08-21 | University Of Washington | Membrane actuator based on ferromagnetic shape memory alloy composite for synthetic jet actuator |
| CN1633021A (en) * | 2004-12-13 | 2005-06-29 | 沈阳工业大学 | Differential-mode magnetic control shape memory alloy actuator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20120926 |