CN109520365A - A kind of thermal switch - Google Patents
A kind of thermal switch Download PDFInfo
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- CN109520365A CN109520365A CN201811592549.9A CN201811592549A CN109520365A CN 109520365 A CN109520365 A CN 109520365A CN 201811592549 A CN201811592549 A CN 201811592549A CN 109520365 A CN109520365 A CN 109520365A
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- moving member
- fixing piece
- thermal switch
- heat
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermally Actuated Switches (AREA)
Abstract
The present invention relates to Refrigeration & Cryogenic Technique fields, disclose a kind of thermal switch, it include: moving member, fixing piece, extensible member and flexible heat-conducting piece, the moving member is arranged towards heat source, cold source is installed on fixing piece, extensible member is arranged between moving member and fixing piece, the both ends of extensible member are connect with moving member and fixing piece respectively, closed first cavity is collectively formed in extensible member and moving member and fixing piece, it is also equipped with flexible heat-conducting piece in the first cavity, the both ends of flexible heat-conducting piece are connect with moving member and fixing piece respectively, it is filled with the working media being changed with temperature in the first cavity, it expands or shrinks in the first cavity by working media, extensible member is promoted to be stretched out and bounced back, stretching and retraction by extensible member, drive moving member and fixing piece that relative motion occurs, so that flexible heat-conducting piece is with flexible Part is stretched out and is bounced back, to realize switching on and off for moving member and heat source.The thermal switch has the advantages that on-off ratio is very big.
Description
Technical field
The present invention relates to Refrigeration & Cryogenic Technique fields, more particularly to a kind of thermal switch.
Background technique
Currently, thermal switch is to refer to the device of thermo-contact or thermal release between two objects of control.In refrigeration and low temperature
In technical field, many applications require two components that can realize thermal connection and heat point respectively under different working condition
From.For example, higher life and reliability requirement is proposed to mechanical refrigeration techniques with the development of space infrared detection technique,
Since space refrigerating machine has not maintenanceability, need to carry out backup design to space refrigerating machine in the same system, in order to drop
It is low or eliminate under off working state that backup refrigeration machine parasitic drain is hot, it needs space refrigerating machine and cooled device through thermal switch
Connection realizes cooling capacity from refrigeration machine to the unidirectional delivery of cooled device using thermal switch.Sub-cooled is carried out in superconducting magnet
When, the Cryo Refrigerator with two-level configuration is generallyd use, superconducting magnet is connect with second level cold head, due to the cooling capacity of second level cold head
Small, low efficiency takes a long time that magnet minimum temperature could be cooled to by room temperature, and refrigeration machine level-one cold head has biggish
Level-one cold head can be connect by refrigerating capacity by thermal switch with magnet, when magnet temperature is higher than level-one cold head temperature, pass through one
Magnet is pre-chilled in grade cold head, when magnet is cooled to level-one cold head following temperature, is in an off state thermal switch, passes through
Second level cold head continues to cool down magnet, so as to which magnet cooling time is greatly shortened.
Common thermal switch mainly has mechanical, gas gap formula, marmem formula, microdilatancy formula, heat pipe-type etc.
The thermal switch of form.Mechanical thermal switch reliability is lower, and needs external driving force；Gas gap formula thermal switch by
The temperature for needing to control adsorption pump using heater and cooler device to realize on-off is inflated and be evacuated between two thermally conductive sheets, is
It unites more complicated, realizes that the conducting thermal resistance of connection is larger using gas conduction, and the response time of thermal switch is by the speed of evacuation
It is affected；Marmem formula thermal switch causes memory metal shape to change using temperature change, and cold and hot component is driven to connect
On-off is opened, structural requirement Striking symmetry, very high to requirement on machining accuracy；Microdilatancy formula thermal switch is thermally expanded using different materials
Coefficient is different, and connection is realized after temperature change or is disconnected, and requirement on machining accuracy is high, and when long-term Operating In Persistent Current Mode is easy to happen cold
Weldering, reliability is poor, and thermal switch is needed to have enough length, and different materials is made directly to form biggish contraction, expansion
Difference cannot be made into short and small structure；Heat pipe-type thermal switch carries out positive efficient heat transfer, reversed disconnection using working medium gas-liquid phase transition,
The usual response time is very long, and conducting and break-off signal are limited to the triple point of gas working medium, may be only available for part work
Temperature range, and heat pipe-type thermal switch is with the obvious advantage when length is larger, and it is smaller that thermal resistance is disconnected when length is shorter.
Summary of the invention
(1) technical problems to be solved
The object of the present invention is to provide a kind of thermal switch, the on-off ratio at least to solve thermal switch in the prior art is small,
Reliability is low, requirement on machining accuracy is high and one of the technical problem that structure is not compact.
(2) technical solution
In order to solve the above-mentioned technical problem, according to the first aspect of the invention, a kind of thermal switch is provided, comprising: moving member,
Fixing piece, extensible member and flexible heat-conducting piece, the moving member are arranged towards heat source, and cold source, institute are equipped on the fixing piece
State extensible member be arranged between the moving member and the fixing piece, the both ends of the extensible member respectively with the moving member and institute
Fixing piece connection is stated, closed first cavity is collectively formed in the extensible member and the moving member and the fixing piece, described
Be also equipped with the flexible heat-conducting piece in first cavity, the both ends of the flexibility heat-conducting piece respectively with the moving member and described solid
Determine part connection, the working media being changed with temperature is filled in first cavity, by the working media in institute
It states in the first cavity and expands or shrink, the extensible member is promoted to be stretched out and bounced back, pass through the stretching of the extensible member
And retraction, drive the moving member and the fixing piece that relative motion occurs, meanwhile, so that the flexibility heat-conducting piece is stretched with described
Contracting part is stretched out and is bounced back, to realize switching on and off for the moving member and heat source.
Wherein, the flexible heat-conducting piece includes flexible capillary structure.
Wherein, the flexible capillary structure includes flexible pencil capillary structure, netted capillary structure, slot-shaped capillary knot
It is at least one of in structure, hole shape capillary structure.
Wherein, the thermal switch further includes transition capillary structure, and the transition capillary structure setting is thermally conductive in the flexibility
Between part and the moving member and/or transition capillary structure setting is between the flexible heat-conducting piece and the fixing piece.
Wherein, the transition capillary structure include microflute, silk screen, sintering felt, sintering powder, in foam metal at least its
Middle one kind.
Wherein, the thermal switch further includes the second fixing piece that the top of the moving member is arranged in, and described second is fixed
Part is connect by supporting element with the fixing piece, wherein is equipped with heat source on second fixing piece, the moving member is towards institute
It states the second fixing piece direction stretch out and retracting motion, to realize switching on and off for the moving member and heat source.
Wherein, the thermal switch further includes the first extension being arranged on the moving member and is arranged in the fixing piece
On the second extension, the flexibility heat-conducting piece connect and/or the flexibility by first extension with the moving member
Heat-conducting piece is connect by second extension with the fixing piece.
Wherein, first extension and second extension are male-female engagement, in first extension and described
It is configured with the second cavity between second extension, second cavity is by setting in first extension and/or described the
Intercommunicating pore on two extensions is connected to first cavity；Or the intercommunicating pore makes second cavity be in communication with the outside.
Wherein, the flexible heat-conducting piece includes thermally conductive rope, thermal conductive belt or thermally conductive sheet.
According to a second aspect of the present application, a kind of thermal switch is also provided, comprising: moving member, fixing piece and extensible member, it is described
Moving member is arranged towards cold source, is equipped with heat source on the fixing piece, and the extensible member setting is in the moving member and described
Between fixing piece, the both ends of the extensible member are connect with the moving member and the fixing piece respectively, the extensible member with it is described
Closed first cavity is collectively formed in moving member and the fixing piece, is filled in first cavity and is changed with temperature
Working media, the working media the thermal switch operation temperature area be gas-liquid two-phase state, the thermal switch work when, institute
Cold source position is stated higher than the heat source position, enables liquid working substance by gravity from the cold source to the heat source stream
It is dynamic, gas-liquid phase transition is occurred by the working media and realizes the heat transfer between the moving member and the fixing piece, is passed through
The working media is expanded or is shunk in first cavity, is promoted the extensible member to be stretched out and bounced back, is passed through
The stretching of the extensible member and retraction drive the moving member and the fixing piece that relative motion occurs, to realize the shifting
Moving part and cold source switch on and off.
(3) beneficial effect
Thermal switch provided by the invention has the advantages that compared with prior art
By the way that moving member to be arranged towards heat source, cold source is set on fixing piece, then fills work into the first cavity
Medium drives moving member to be moved upwards using the expansion and contraction of working media, and the length travel amount of the moving member is larger,
Thermal switch conducts heat when being connected by the conductive force that the surface of solids between moving member and heat source contacts, stability of conducting heat
Height, conducting heat transfer resistance is smaller, and when thermal switch disconnects, the contact surface between moving member and heat source is thoroughly separated, and disconnects heat
Resistance is very big, so as to make thermal switch obtain very big on-off ratio.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the thermal switch of the first embodiment of the application；
Fig. 2 is the overall structure diagram of the thermal switch of the second embodiment of the application；
Fig. 3 is the overall structure diagram of the insulation support construction in Fig. 2；
Fig. 4 is the overall structure diagram of the thermal switch of the 3rd embodiment of the application；
Fig. 5 is the overall structure diagram of the thermal switch of the fourth embodiment of the application；
Fig. 6 is the overall structure diagram of the thermal switch of the 5th embodiment of the application.
In figure, 1: thermal switch；11: moving member；111: the first extensions；12: fixing piece；121: the second extensions；13: stretching
Contracting part；14: the first cavitys；15: flexible heat-conducting piece；151: transition capillary structure；16: supporting element；17: the second fixing pieces；18: the
Two cavitys；181: intercommunicating pore；2: heat source；3: cold source.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Following instance
For illustrating the present invention, but it is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It should be noted that unless explicitly stated or limit, relate to up and down, control the side stated
Formula is the description that the setting orientation presented for current schematic diagram carries out.
As shown in Figure 1, schematically showed in figure the thermal switch include moving member 11, fixing piece 12, extensible member 13 with
And flexible heat-conducting piece 15.
In embodiments herein, which is arranged towards heat source 2, is equipped with cold source 3 on the fixing piece 12,
The extensible member 13 be arranged between the moving member 11 and the fixing piece 12, the both ends of the extensible member 13 respectively with the moving member 11 and
Closed first cavity 14 is collectively formed in the fixing piece 12 connection, the extensible member 13 and the moving member 11 and the fixing piece 12,
Be also equipped with the flexibility heat-conducting piece 15 in first cavity 14, the both ends of the flexibility heat-conducting piece 15 respectively with the moving member 11 and should
Fixing piece 12 connects, and is filled with the working media being changed with temperature in first cavity 14, is existed by the working media
It expands or shrinks in first cavity 14, promote the extensible member 13 to be stretched out and bounced back, pass through stretching for the extensible member 13
It out and bounces back, drives the moving member 11 and the fixing piece 12 that relative motion occurs, meanwhile, so that the flexibility heat-conducting piece 15 is stretched with this
Contracting part 13 is stretched out and is bounced back, to realize switching on and off for the moving member 11 and heat source 2.
Specifically, by the way that moving member 11 to be arranged towards heat source 2, cold source 3 is set on fixing piece 12, then to the first chamber
Working media is filled in body 14, drives moving member 11 to be moved upwards using the expansion and contraction of working media, the moving member
11 length travel amount is larger, the thermally conductive work that thermal switch 1 contacts when being connected by the surface of solids between moving member 11 and heat source 2
With conducting heat, heat transfer stability is high, and conducting heat transfer resistance is smaller.When thermal switch 1 disconnects, between moving member 11 and heat source 2
Contact surface thoroughly separates, and disconnection thermal resistance is very big, so as to make thermal switch 1 obtain very big on-off ratio.
In addition, moving member 11 passes through flexible heat-conducting piece 15 with fixing piece 12 and connect, soft by adding the flexibility heat-conducting piece 15
Property heat-conducting piece 15 inside of extensible member 13 is set, flexible concertina can occur along the telescopic direction of extensible member 13, meanwhile, begin
It keeps moving member 11 to be in the state that heat is connected with fixing piece 12 eventually, makes that phase can occur between moving member 11 and fixing piece 12
To movement, and heat can be made efficiently to be transmitted between moving member 11 and fixing piece 12.In addition, the flexibility heat-conducting piece 15 is also
The length of thermal switch 1 can be extended, convenient for cold source 3 and heat source 2 in the farther away situation of standoff distance, still can carry out heat transfer cloth
It sets.
It should be noted that the length of flexible heat-conducting piece 15 can be designed according to the length requirement of thermal switch 1,
Flexible heat-conducting piece 15 preferably selects the higher material of thermal conductivity to be made, for example, thermally conductive rope can be made, led using red copper material
The torrid zone, thermally conductive sheet or other flexible conductive structures.
It should also be noted that, the moving member 11 can also be arranged towards cold source 3, heat source may also set up on the fixing piece 12
2。
The working media being filled in first cavity 14 of thermal switch 1 is gaseous state or gas-liquid two-phase shape in operation temperature area
State can require select gaseous species according to specific works warm area, for example, when working in 80K warm area, can choose helium,
Neon, nitrogen or oxygen etc..
When working in 30K warm area, helium, neon etc. can choose, the gas being filled with can be pure gas, be also possible to
By the admixture of gas after several mixed gases.
It is filled with the size of gas pressure, needs the stroke requirement of the elastic size and extensible member 13 according to extensible member 13
It is designed, makes thermal switch 1 that there is suitable swell increment or shrinkage during the work time.Furthermore it is also possible to which spring etc. is arranged
Elastic construction has extensible member 13 to be suitable for for adjusting and balance the elastic force and the intracorporal pressure of the first chamber of extensible member 13
Length or stroke.
As shown in Figure 1, Figure 2, shown in Fig. 4 and Fig. 5, when working media is the state of gas-liquid two-phase in the operation temperature area of thermal switch 1
When, liquid working media can flow back by gravity or capillarity, and liquid occurs at the higher position of temperature
Evaporation, the gas of generation flows to the lower position of temperature and coagulates, by working media between moving member 11 and fixing piece 12
Gas-liquid phase transition and circulate carry out efficient heat transfer.
When working media 1 operation temperature area of thermal switch be gas-liquid two-phase state when, can use flexibility capillary structure as
Flexible heat-conducting piece 15, to realize liquid using the capillarity of flexible capillary structure for connecting moving member 11 and fixing piece 12
Reflux, the flexibility heat-conducting piece 15 have the function of simultaneously transmit heat, flexible connection and promote liquid reflux.
In the present embodiment, the liquid in first cavity 14 can steam on the surface of the higher moving member 11 of temperature
Hair, the gas of generation flows to the surface of the lower fixing piece 12 of temperature and coagulates, and the liquid working substance of condensation is further along having
The flexible heat-conducting piece 15 of flexible capillary structure flow back into the higher position of temperature again, by working media gas-liquid phase transition and follow
Circulation is dynamic, so that can increase substantially heat-transfer effect between moving member 11 and fixing piece 12.
As shown in Figure 1, Figure 2, shown in Fig. 4 and Fig. 5, in a preferred embodiment, which further includes transition capillary knot
Structure 151, which is arranged in the lower surface of the moving member 11 and/or the upper surface of the fixing piece 12, i.e., close
The surface of flexible 15 side of heat-conducting piece, the contact surface of the transition capillary structure 151 and the moving member 11 and/or fixing piece 12 are tight
Contiguity touching.
In another specific embodiment, which is multiple and is arranged in compartment.
The transition capillary structure 151 is laminated structure, and the transition capillary structure 151 is protruded into the end of the flexibility heat-conducting piece 15
Inside, and be in close contact with transition capillary structure 151.
Specifically, using transition capillary structure 151 increase the higher moving member 11 of temperature disengagement area, increase temperature compared with
The condensation area of low fixing piece 12.In addition, transition capillary structure 151 also acts as the effect of bridge joint during liquid flows,
The liquid for enabling the surface of fixing piece 12 to condense successfully is flowed into flexible capillary structure along transition capillary structure 151
Then portion then flows into the transition capillary structure 151 on 11 surface of moving member, so that working media extends to bigger face
After product space, re-evaporation is gas.
In the present embodiment, flexible capillary structure selection wellability is good as a preferred technical solution, porosity is big, hair
The thin big material of power is made, and for conveying liquid, promoting liquid reflux, flexible heat-conducting piece 15 is not limited to capillary structure, only
Thermally conductive material that is good, meeting flexibility requirements need to be selected to be made.
In another embodiment, the one of which in flexible heat-conducting piece 15 and flexible capillary structure is at least set.Specifically
Ground, when thermal switch 1 only includes flexible heat-conducting piece 15, working media can be gaseous state or gas-liquid two-phase state in operation temperature area,
The main convergent-divergent generated using the convergent-divergent of gas or gas-liquid phase transition acts on the on-off to realize thermal switch 1, and work is situated between
The effect that matter transmits heat is relatively small, when the gravity secondary status that there are evaporation bits to set low, condensation site is high, gas-liquid two-phase
Heat-transfer effect can be greatly enhanced in the working media of state.
When thermal switch 1 only includes flexible capillary structure, working media is gas-liquid two-phase state, Neng Gouli in operation temperature area
Make liquid reflux with capillary structure, efficient heat transfer is realized by working medium gas-liquid phase transition.
It is provided on the first cavity 14 in thermal switch 1 and fills a mouthful (not shown), fill mouth setting in extensible member 13 or moved
On moving part 11 or fixing piece 12, for filling working media.Work of the working media filled in first cavity 14 in thermal switch 1
It can be gas in warm area, be also possible to gas-liquid two-phase state.Before filling working media, make the first cavity 14 by filling mouth
It is in communication with the outside, after filling working media, is filled with mouth sealing, the first cavity 14 is made to be in closed state.
Moving member 11, fixing piece 12 select the preferable material of heating conduction to be made, such as can select red copper, aluminium etc. to lead
The hot higher metal material of coefficient.Extensible member 13 can be bellows, can also be other structures or material with Telescopic
Material, such as can be and be made of rubber tubular or cystic structures etc..
Flexible capillary structure can be in the capillary structure with the forms such as pencil flexible, netted, gap, hole extremely
Few a kind of form, such as kernmantle, silk screen, metal felt, fibre bundle etc..Transition capillary structure 151 can be microflute, silk screen, burning
Tie at least one of the capillary structures such as felt, sintering powder, foam metal structure.
There are multiple-working mode, fixing pieces 12 can connect with heat source 2 for the present embodiment thermal switch 1, can also be with cold source 3
Connection, the original state of extensible member 13 can be elongation state, or contraction state.For example, can by fixing piece 12 with
Heat source 2 connects, and original state of the thermal switch 1 in operation temperature area is contraction state, separates moving member 11 with cold source 3, i.e., hot
Switch 1 is off-state.
After 2 temperature of heat source increases, working media volume increases, and extensible member 13 extends, and connects moving member 11 and cold source 3
Connect, i.e., thermal switch 1 is in the conductive state, the heat of heat source 2 constantly to cold source 2 transmit, thus reach to cold source 3 carry out heating or
To the purpose of 2 cooling down of heat source.
Alternatively, fixing piece 12 can also be connect with cold source 3, original state of the thermal switch 1 in operation temperature area is elongation
State connect moving member 11 with heat source 2, i.e., thermal switch 1 is on state.With the continuous reduction of 3 temperature of cold source, work is situated between
Matter volume contraction, extensible member 13 shorten, and the heat of heat source 2 transmits with keeping to cold source 3, when cold source 3 is reduced to default temperature
After degree, the shrinkage of extensible member 13 reaches preset value, disconnects moving member 11 and heat source 2, i.e., thermal switch 1 is off-state.
Below by taking the thermal switch 1 for working in low temperature warm area as an example, the course of work of the present embodiment is illustrated, the first chamber
Gas filled with certain pressure in body 14, extensible member 13 is in swelling state at room temperature, and moving member 11 and heat source 2 are close
Contact, fixing piece 12 are connect with cold source 3, the state that thermal switch 1 is at this time.After the start-up operation of cold source 3, cold source 3
Temperature gradually decrease, also decline therewith with the temperature of the close-connected fixing piece 12 of cold source 3, the heat of heat source 2 passes sequentially through
Moving member 11, flexible heat-conducting piece 15, fixing piece 12 are transmitted to cold source 3, and are taken away by cold source 3, under the temperature of heat source 2 is continuous
Drop.During the temperature of fixing piece 12 reduces, the gas temperature in extensible member 13 is gradually lowered, and volume is gently received
Contracting, the pressure contacted between moving member 11 and heat source 2 also gently reduces, but still is kept in contact.When the temperature of heat source 2 is down to
After operation temperature area, the shrinkage of extensible member 13 also reaches preset value, and moving member 11 is completely separated with heat source 2, at this point, thermal switch
1 is in an off state.After the temperature of cold source 3 increases, volume expansion in extensible member 13, extensible member 13 is swollen therewith
Swollen, moving member 11 is contacted with heat source 2 again, thus the state for being on heat source 2 and cold source 3 again.
Fig. 2 is the structural schematic diagram of second embodiment of the invention thermal switch 1, in addition to the basic structure with first embodiment
In addition, also increase on the basis of it and be provided with the second fixing piece 17, the second fixing piece 17 passes through supporting element 16 and fixing piece 12
Connection, fixing piece 12 connect with cold source 3, and the second fixing piece 17 is connect with heat source 2, by moving member 11 and the second fixing piece 17 it
Between be contacting and separating, realize 1 conductive force of thermal switch on-off.Supporting element 16 plays fixed, support and heat-blocking action, selects heat
The lower material of conductance is made, and it is good, strong that supporting element 16 can be strip, rod-shaped, sheet or thin cylindric or other insulation effects
The structure spent.
Fig. 3 is that a kind of embodiment is insulated support construction schematic diagram, and the supporting element 16 in the present embodiment is rod-like structure, four
Supporting element, which is uniformly distributed, to be set between fixing piece 12 and the second fixing piece 17, and strength support requirement is not only able to satisfy, additionally it is possible to
With good insulation effect, make thermal switch 1 that there is biggish disconnection thermal resistance, to obtain very big on-off ratio.
In the present embodiment, the second fixing piece 17 and supporting element 16 not only can be with basic structures shown in first embodiment
In conjunction with can also be combined with the thermal switch 1 of several embodiments shown in fig. 4 to fig. 6 or other structures form.The advantages of the present embodiment
That the movement that is contacting and separating of thermal switch 1 occurs in the inside of thermal switch 1, moving member 11 will not continually with heat source 2 or cold source 3
It is in contact or separates, avoid heat source 2 or cold source 3 frequently by active force.
Fig. 4 is the structural schematic diagram of third embodiment of the invention thermal switch 1, and the heat of it and first embodiment shown in Fig. 1 is opened
The primary structure composition and the course of work of pass 1 are substantially similar, also thermally conductive including moving member 11, fixing piece 12, extensible member 13, flexibility
Part 15, the difference is that, it is equipped with the first extension 111 on the moving member 11, second is equipped on the fixing piece 12 and is extended
Part 121 is male-female engagement between first extension 111 and the second extension 121.
At least one surface contacts between first extension 111 and the second extension 121, in moving member 11 and fixing piece
When being relatively moved between 12, it is kept in contact between the first extension 111 and the second extension 121, is sent out along contact surface
Raw sliding.First extension 111 and the second extension 121 can play the role of positioning, prevent moving member 11 in movement
It shifts or tilts in the process, moving member 11 can be made to be in contact with it part and better contacted with.
In addition, by the way that first extension 111 is arranged and must allow extension 121, so as to extend the length of thermal switch 1
Degree, convenient for cold source 3 and heat source 2 relatively far apart apart from when carry out heat transfer arrangement.
In addition, the setting of first extension 111 and the second extension 121, additionally it is possible to increase moving member 11 and fixing piece
Contact area between 12 reduces the heat transfer resistance between moving member 11 and fixing piece 12.Moving member 11, fixing piece 12, first
Extension 111 and the second extension 121 select to be made of the preferable material of heating conduction, for example, red copper, aluminium etc. can be selected
The higher metal material of thermal coefficient.
In a preferred embodiment, which is configured to be extended towards the fixing piece direction convex
Portion, the annular that the second extension 121 is configured to the upper surface from the fixing piece 12 and is extended towards the direction of the moving member 11
Cavity, the opening of the annular housing is towards protrusion, wherein the protrusion is inserted into the annular housing and can be with respect to the annular housing
Longitudinal direction carry out stretch out and retracting motion.
In the present embodiment, the second cavity 18 of the first extension 111 and the second extension 121 composition is set to extensible member
The shape of 13 outside, the first extension 111 and the second extension 121 all can be cylindric, the both ends difference of extensible member 13
It is connect with moving member 11 and fixing piece 12, or the first extension 111, the second extension 121 and moving member 11 can also be passed through
It connects, form closed first cavity 14 and is set to inside the second cavity 18 with fixing piece 12.
Filled with working media in first cavity 14, with temperature change, the volume of working media is expanded or is shunk, and is stretched
Telescopic variation occurs therewith for contracting part 13 and flexible heat-conducting piece 15, relatively moves between moving member 11 and fixing piece 12, herein
In the process, the contact surface between the first extension 111 and the second extension 121, which remains, contacts with each other, and can be smooth
Opposite sliding occurs for ground.
In the present embodiment, it is provided with intercommunicating pore 181 in 121 bottom of the second extension, the intercommunicating pore 181 is for making second
Cavity 18 is connected to the external world of thermal switch 1, and the second cavity 18 is remained with the external world with uniform pressure, so as to the first extension
111 and second opposite sliding more swimmingly occurs between extension 121.It can also prolong in the first extension 111 and/or second
It stretches and opens up at least one intercommunicating pore 181 or/and connectivity slot (not shown) on part 121, to reach identical or better connection effect
Fruit.
Fig. 5 is the structural schematic diagram of fourth embodiment of the invention thermal switch, 3rd embodiment thermal switch 1 shown in it and Fig. 4
Primary structure composition and the course of work it is substantially similar, also include moving member 11, fixing piece 12, extensible member 13, flexible heat-conducting piece
15, the difference is that, in the fourth embodiment, the first extension 111, the second extension 121, the second cavity 18 are set to
Inside one cavity 14, the both ends of flexible heat-conducting piece 15 are connect with the first extension 111 and fixing piece 12 respectively, the first extension
111, the second extension 121 and flexible heat-conducting piece 15 can play the heat transfer resistance reduced between moving member 11 and fixing piece 12
Effect, guarantee successfully move between moving member 11 and fixing piece 12.
In the present embodiment, the first extension 111 can be set to cylindric, and the second extension 121 is set as cylindric,
The inner surface of the cylindrical surface of first extension 111 and the second extension 121 is fitted close and can be free to slide, passes through contact
Cylindrical surface can conduct heat.Closed second cavity 18 is formd between first extension 111 and the second extension 121, this
It is provided with intercommunicating pore 181 in the bottom of the second extension 121 in embodiment, is different from the third embodiment, which sets
It sets, so that the second cavity 18 is connected to the first cavity 14, remains between the second cavity 18 and the first cavity 14 with identical
Pressure, so that opposite slide can more swimmingly occur between the first extension 111 and the second extension 121.Similarly,
At least one intercommunicating pore 181 or/and connectivity slot can also be opened up (not on the first extension 111 and/or the second extension 121
Show), reach identical or is preferably connected to effect.
As shown in fig. 6, according to a second aspect of the present application, the thermal switch 1 of the embodiment and first embodiment shown in FIG. 1
Primary structure composition and the course of work it is substantially similar, also include moving member 11, fixing piece 12, extensible member 13, difference exists
In in this embodiment and not set flexible heat-conducting piece 15, working media are needed in the operation temperature area of thermal switch 1 for gas-liquid two
Phase state, the position of heat source 2 need the position lower than cold source 3, it is preferable that and heat source 2 is set to lower section, and cold source 3 is set to top,
It needs to realize liquid reflux by the effect of gravity, liquid evaporates on the surface of the higher fixing piece 12 of temperature, generation
The surface that gas flows to the lower moving member 11 of temperature coagulates, and liquid working media is returned by the gravity of itself
Stream, by working media gas-liquid phase transition and circulate the efficient heat transfer realized between moving member 11 and fixing piece 12, utilize
The contraction or expansion that working media occurs in temperature change realizes the on-off of thermal switch 1.
In above several embodiments, in order to reduce the heat of the contact between moving member 11 or fixing piece 12 and other parts
Indium film or indium sheet can be arranged in contact surface position in resistance.It is changed to reduce the radiation between moving member 11 and another contact
Heat can carry out coating film treatment in contact surface.
In conclusion the expansion and contraction using working media drive moving member 11 to move, the displacement of moving member 11
The on-off ratio larger, the acquisition of thermal switch 1 can be made very big is measured, and structure is simple, processing technology requires lower.It is led using flexibility
15 connection fixture 12 of warmware and moving member 11 can make moving member 11 that phase occur in the state of keeping and being connected to fixing piece 12
It to movement, is successfully transmitted convenient for heat, additionally it is possible to extend the length of thermal switch 1, be separated by convenient for cold source 3 and heat source 2
Heat transfer arrangement is carried out when farther out, when the flexible capillary structure of use, when working media is gas-liquid two-phase state, moreover it is possible to play promotion liquid
Body reflux, the effect for reinforcing heat transfer.By the first extension 111 of setting and the second extension 121, so as to play positioning
Effect, be effectively prevented moving member 11 and shift or tilt in the process of movement, additionally it is possible to extend thermal switch 1 length,
Increase the contact area between moving member 11 and fixing piece 12.Therefore, thermal switch 1 proposed by the present invention can obtain very high open
Close ratio.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of thermal switch characterized by comprising
Moving member, fixing piece, extensible member and flexible heat-conducting piece, the moving member are arranged towards heat source, pacify on the fixing piece
Equipped with cold source, the extensible member is arranged between the moving member and the fixing piece, the both ends of the extensible member respectively with institute
It states moving member to connect with the fixing piece, the extensible member and the moving member and the fixing piece are collectively formed closed first
Cavity, is also equipped with the flexible heat-conducting piece in first cavity, the both ends of the flexibility heat-conducting piece respectively with the shifting
Moving part is connected with the fixing piece, the working media being changed with temperature is filled in first cavity, by described
Working media is expanded or is shunk in first cavity, promotes the extensible member to be stretched out and bounced back, by described
The stretching of extensible member and retraction drive the moving member and the fixing piece that relative motion occurs, meanwhile, so that the flexibility is led
Warmware is stretched out and is bounced back with the extensible member, to realize switching on and off for the moving member and heat source.
2. thermal switch according to claim 1, which is characterized in that the flexibility heat-conducting piece includes flexible capillary structure.
3. thermal switch according to claim 2, which is characterized in that the flexibility capillary structure includes flexible pencil capillary knot
It is structure, netted capillary structure, slot-shaped capillary structure, at least one of in hole shape capillary structure.
4. thermal switch according to claim 1, which is characterized in that the thermal switch further includes transition capillary structure, described
The setting of transition capillary structure is between the flexible heat-conducting piece and the moving member and/or transition capillary structure setting exists
Between the flexibility heat-conducting piece and the fixing piece.
5. thermal switch according to claim 4, which is characterized in that the transition capillary structure includes microflute, silk screen, sintering
It is felt, sintering powder, at least one of in foam metal.
6. thermal switch according to claim 1, which is characterized in that the thermal switch further includes that the moving member is arranged in
Second fixing piece of top, second fixing piece are connect by supporting element with the fixing piece, wherein fixed described second
Heat source is installed, the moving member carries out stretching and retracting motion towards second fixing piece direction, thus described in realizing on part
Moving member and heat source switch on and off.
7. thermal switch according to claim 1, which is characterized in that the thermal switch further includes being arranged on the moving member
The first extension and/or the second extension for being arranged on the fixing piece, the flexibility heat-conducting piece prolong by described first
Stretch that part is connect with the moving member and/or the flexible heat-conducting piece is connect by second extension with the fixing piece.
8. thermal switch according to claim 7, which is characterized in that first extension is recessed with second extension
Convex cooperation is configured with the second cavity between first extension and second extension, and second cavity is by setting
The intercommunicating pore set on first extension and/or second extension is connected to first cavity；Or the connection
Hole makes second cavity be in communication with the outside.
9. thermal switch according to claim 1, which is characterized in that it is described flexibility heat-conducting piece include thermally conductive rope, thermal conductive belt or
Thermally conductive sheet.
10. a kind of thermal switch characterized by comprising
Moving member, fixing piece and extensible member, the moving member are arranged towards cold source, and heat source, institute are equipped on the fixing piece
State extensible member be arranged between the moving member and the fixing piece, the both ends of the extensible member respectively with the moving member and institute
Fixing piece connection is stated, closed first cavity is collectively formed in the extensible member and the moving member and the fixing piece, described
The working media being changed with temperature is filled in first cavity, the working media is gas in the thermal switch operation temperature area
Liquid two-phase state, when the thermal switch works, the cold source position is higher than the heat source position, and liquid working substance is relied on
Gravity is flowed from the cold source to the heat source, by the working media occur gas-liquid phase transition realize the moving member with
Heat transfer between the fixing piece is expanded or is shunk in first cavity by the working media, promoted
The extensible member is stretched out and is bounced back, and stretching and retraction by the extensible member drive the moving member and the fixation
Relative motion occurs for part, to realize switching on and off for the moving member and cold source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811592549.9A CN109520365A (en) | 2018-12-25 | 2018-12-25 | A kind of thermal switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811592549.9A CN109520365A (en) | 2018-12-25 | 2018-12-25 | A kind of thermal switch |
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| Publication Number | Publication Date |
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| CN109520365A true CN109520365A (en) | 2019-03-26 |
Family
ID=65796881
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811592549.9A Pending CN109520365A (en) | 2018-12-25 | 2018-12-25 | A kind of thermal switch |
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| Country | Link |
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| CN (1) | CN109520365A (en) |
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| CN110686551A (en) * | 2019-10-10 | 2020-01-14 | 深圳航天东方红海特卫星有限公司 | Thermal switch |
| CN111725157A (en) * | 2020-06-20 | 2020-09-29 | 西安交通大学 | Intelligent phase change cooling structure based on shape memory material |
| CN114396816A (en) * | 2021-12-29 | 2022-04-26 | 中国原子能科学研究院 | Heat transfer device |
| CN115087311A (en) * | 2022-06-17 | 2022-09-20 | 杭州海康威视数字技术股份有限公司 | Electronic device |
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