KR20230016542A - Thermal conductive gap filler unit - Google Patents

Abstract

Disclosed is a heat transfer unit in which a user can conveniently use a liquid thermoelectric element in a gel or grease state. According to the present invention, a sealing material having flexibility and elasticity is formed along the edges of the opposing surfaces of the solid first and second contact members facing each other and having respective thermal conductivity is formed, and a part of the internal space is filled with a thermoelectric element having flowability or spreadability, so that when the force provided by an object presses the sealing material and the thermoelectric element, the thermoelectric element flows or spreads in the internal space due to the flowability or spreadability, and the thickness of the heat transfer unit becomes thin.

Description

Heat transfer unit {Thermal conductive gap filler unit}

The present invention relates to a heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat from the heating source to the cooling body, and in particular, a gel or grease having flowability or spreadability. The thermoelectric element in the (grease) state is related to a heat transfer unit that a user can conveniently use.

A thermally conductive gap filler interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat from the heating source to the cooling body, is a sheet-shaped solid pad ( pad, liquid gel with high viscosity, and liquid grease with medium viscosity.

Like the thermally conductive silicone rubber pad, the pad is solid, so it is easy to provide a certain size, and it is easy to attach to a heating source or a cooling body because it usually has self-adhesiveness. There is a disadvantage that it is difficult to apply when the tolerance between the gaps is large. In addition, a pad having high thermal conductivity and low pressing force has a low mechanical strength and is difficult to manufacture and handle, making it difficult to provide a pad with a certain thickness or more.

Since thermally conductive gel and grease are in liquid form, they are directly formed on the heating source or cooling body by printing or dispensing after putting them in a container such as a syringe, so printing or dispensing directly at the place where the heat transfer unit is applied The downside is that it has to be provided.

In addition, even if a certain amount of gel and grease is provided to the object, the gel and grease have spreadability or flowability, so when pressed between objects, they may escape in an undesirable direction due to the tolerance between objects or may be insufficient in some parts. there is For example, there is a disadvantage in that it is difficult to provide a uniform amount and a uniform shape between objects due to tolerances between objects or a pressing method.

In addition, gel and grease have spreadability or flowability, so when applied to a device that experiences a lot of vibration or impact, such as an automobile, the gel and grease intervened between objects may escape to an undesirable place due to repeated vibration or impact. there is.

In addition, since the gel and grease have self-adhesiveness and low mechanical strength, it is inconvenient to remove the gel and grease from the object when repairing or replacing the object after the gel and grease are interposed between the objects.

According to Korea Patent No. 2139232 of the present applicant for overcoming these disadvantages, a body composed of a ring-shaped elastic frame having a uniform thickness and a predetermined width and a thermal conductive sheet adhered to the lower surface of the frame and having an accommodation space therein; and a thermoelectric element having viscosity and being accommodated in the receiving space and adhered to the thermal conductive sheet, wherein the thermoelectric element has a spreadability due to the viscosity of the thermoelectric element and is applied to the thermoelectric element in a direction perpendicular to the force. Disclosed is a heat conduction member characterized in that it spreads horizontally on the heat conductive sheet in the accommodation space.

According to the present invention, a mechanical cover covering the thermoelectric element is not formed on the upper part of the thermoelectric element, and as a result, the thermoelectric element of the heat conducting member is exposed to the outside, making handling such as vacuum pickup inconvenient in this part, and the exposed thermoelectric element There is a disadvantage that it is inconvenient to remove it when it comes into contact with the object.

In addition, when the viscosity of the thermoelectric element is medium, such as grease, when vibration or rotation is provided after being mounted on the final product, the grease has a disadvantage in that the grease flows out of the accommodation space or is easily biased.

In addition, since the elastic frame is provided by punching and sticking a solid sheet corresponding thereto with a blade mold, the work is cumbersome and difficult to provide economically.

In addition, since the frame and the thermal conductive sheet are adhered with an adhesive, it is difficult to maintain reliable adhesion when the frame has a narrow width and a high height, a complex shape, or a high temperature of the device used. .

Accordingly, an object of the present invention is to provide a heat transfer unit that is easy to handle and use by a user while having a thermoelectric element having flowability or spreadability.

Another object of the present invention is to provide a heat transfer unit capable of easily and reliably forming a sealant into desired dimensions and shapes.

Another object of the present invention is to provide a heat transfer unit in which a sealing material is easily and reliably adhered to opposing first and second contact members.

Another object of the present invention is to provide a heat transfer unit having mechanical stability.

Another object of the present invention is to provide a heat transfer unit that can be easily applied between objects having various shapes and structures.

Another object of the present invention is to provide a heat transfer unit that is easy to repair or replace and is convenient.

According to one aspect of the present invention, as a heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat of the heating source to the cooling body, the solid phases facing each other and having respective thermal conductivity first and second contact members; a sealant having elasticity and flexibility for bonding and sealing the first and second contact members together along edges of opposite surfaces of the first and second contact members; an inner space formed by the sealing material between the first and second contact members; and a thermoelectric element that fills a part of the inner space and has flowability or spreadability, and when a force provided by the object presses the sealing material and the thermoelectric element, the thermoelectric element is formed by the flowability or spreadability. The heat transfer unit is characterized in that the thickness of the heat transfer unit is thinned by flowing or spreading in the inner space.

In another aspect of the present invention, a heat transfer unit interposed between a heating source and a cooling body, which are opposed objects, and used to transfer heat of the heating source to the cooling body, composed of a single body and bent at one side to face each other. a solid contact member having thermal conductivity formed with first and second contact portions; a thermally conductive sealant having elasticity and flexibility formed along opposite edges of the first and second contact portions to seal the contact member; an inner space formed by the sealing material between the first and second contact portions; and a thermoelectric element that fills a part of the inner space and has flowability or spreadability, and when a force provided by the object presses the sealing material and the thermoelectric element, the thermoelectric element is formed by the flowability or spreadability. The heat transfer unit is characterized in that the thickness of the heat transfer unit is thinned by flowing or spreading in the inner space.

According to another aspect of the present invention, a heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat of the heating source to the cooling body, is composed of a single body and has an opening on one side, a rubber housing having first and second contact portions facing each other; thermal conductivity, stretchability, and flexibility; a thermally conductive sealing material formed by sealing the opening and having elasticity and flexibility to which the first and second contact portions are bonded; A thermoelectric element that fills a portion of the inner space of the housing and has flowability or spreadability, and when the housing is pressed by a force provided by the object, the thermoelectric element expands into the interior space by the flowability or spreadability. A heat transfer unit characterized in that the thickness of the heat transfer unit is reduced by flowing or spreading in space is provided.

According to the present invention, the heat transfer unit has mechanical safety because the thermoelectric element having flowability or spreadability is sealed by the first and second contact members and the sealing material.

In addition, since a soft thermoelectric element having flowability or spreadability is built-in, it is easy to apply between objects having various shapes and structures, and the thermoelectric element does not escape to the outside, so repair and exchange are easy.

In addition, since the sealing material formed by bonding along the edges of the first and second contact members is formed by hardening after the corresponding liquid silicone rubber adhesive is printed or dispensed, it is easy to adjust the width and size, and adhesion even at high temperature It is reliable and can adhere to the opposite object.

In addition, since the sealing material is made of an elastic and flexible material, it is possible to maintain sealing without cracking easily even when the heat transfer unit is bent or folded, and the heat transfer is effective by elastic contact with an opposing object.

In addition, when an opposing object presses the heat transfer unit, the air formed in the inner space escapes to the outside through the through hole, and the thermoelectric element is easily spread into the empty space.

In addition, when the graphite layer is formed on the first or second contact member present in the inner space, the thermal conductivity in the plane direction is improved, and when the first and second contact portions are bent on one side and opposed to each other, various characteristics or A heat transfer unit having a purpose can be provided.

In addition, heat transfer is good when the first and second contact parts of the heat transfer unit are metal sheets, and elasticity, flexibility and elasticity are good when they are polymer sheets including rubber.

Figure 1 (a) is an exploded perspective view showing a heat transfer unit according to an embodiment of the present invention, 1 (b) is a cross-sectional view.
Figure 2 shows the operation of the heat transfer unit.
3 shows a heat transfer unit according to another embodiment of the present invention.
4 shows a heat transfer unit according to another embodiment of the present invention.
5 shows a heat transfer unit according to another embodiment of the present invention.

It should be noted that technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in the present invention should be interpreted in terms commonly understood by those of ordinary skill in the art to which the present invention belongs, unless specifically defined otherwise in the present invention, and are excessively inclusive. It should not be interpreted in a positive sense or in an excessively reduced sense. In addition, when the technical terms used in the present invention are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to context, and should not be interpreted in an excessively reduced sense.

Figure 1 (a) is an exploded perspective view showing a heat transfer unit according to an embodiment of the present invention, 1 (b) is a cross-sectional view.

The heat transfer unit 100 may be interposed between, for example, a heat source and a cooling body (heat sink, case, etc.) to transfer heat from the heat source to the cooling body.

The heat transfer unit 100 has first and second thermally conductive contact members 110 and 120 facing each other, each bonded between the first and second contact members along the edge to seal the inner space 102, and elasticity. It consists of a sealing material 130 having flexibility and a thermoelectric element 140 filling a part of the inner space 102 .

Here, the opposing inner surfaces of the first and second contact members 110 and 120 to which the sealing material 130 is bonded may be flat or may have protrusions or concavo-convex surfaces that have good adhesion to the sealing material 130, and Surfaces exposed to the outside of the first and second contact members 110 and 120 in contact with the object form a flat surface.

In this embodiment, the first and second contact members 110 and 120 may be a thermally conductive polymer sheet including a thermally conductive rubber sheet, or a metal sheet including copper, copper alloy, aluminum or aluminum alloy, or a combination thereof. can

When the first and second contact members 110 and 120 are metal sheets, the thermal conductivity is higher than that of the polymer sheet, but there is a disadvantage in that the surface in contact with the object is small, and the polymer sheet has characteristics opposite to those of the metal sheet.

The first and second contact members 110 and 120 have mechanical characteristics of not being destroyed while making a lot of contact with the object when the heat transfer unit 100 is pressed against the object.

Here, in the case of a polymer sheet, it may have self-adhesive force and preferably has elasticity.

As will be described later, the first and second contact members 110 and 120 may be two independently separated contact members or a single contact member connected at one side.

In order for the heat transfer unit 100 to have flexibility, elasticity, and elasticity as a whole, the first and second contact members 110 and 120 are formed of silicone rubber sheets, and the internal thermoelectric element 140 is moved by the force provided by the object. It should have mechanical strength to the extent that it does not leak to the outside.

Since the first and second contact members 110 and 120 of the heat transfer unit 100 are in close contact with the opposing object by being pressed, they are interposed between a cooling body such as a heat sink and a heating source such as a CPU chip, respectively. When contacting, many areas can be contacted even if there is no separate well pressed interface.

When the first and second contact members 110 and 120 are two independently separated contact members, the materials and sizes of the first and second contact members 110 and 120 may be the same or different. However, if they are different, they can be effectively selected and applied according to the heat transfer effect and the situation of the opposing object. For example, a contact member made of a material with high thermal conductivity can be used for a part in contact with a heat source, and a contact member made of a material with a large size and high mechanical strength can be selected to be used for a part in contact with a cooling body. Depending on the structure and capacity of the source and the cooling body, a thermally conductive polymer sheet may be selected for a portion in contact with the heat source and a metal sheet for a portion in contact with the cooling body.

Here, preferably, the first and second contact members 110 and 120 have a thickness of about 0.01 mm to about 0.3 mm and have a flat shape.

Optionally, a graphite layer may be formed on one of the surfaces of the first and second contact members 110 and 120 facing each other. In this case, the heat transfer unit 100 has an advantage of better heat transfer in the horizontal direction by the graphite layer.

A through hole 112 may be formed in a portion adjacent to an edge of the first contact member 110 .

The through hole 112 may be formed in the first contact member 110 in contact with the cooling body corresponding to a portion of the inner space 102 not filled with the thermoelectric element 140. As will be described later, the thermoelectric element ( 140) is used as a passage through which the air existing in the inner space 102 escapes to the outside.

The size of the through hole 112 is such that the thermoelectric element 140 in the internal space 102 does not escape through the through hole 112 when the heat transfer unit 100 is pressed. can

The sealing material 130 has elasticity and flexibility, so that the sealing material 130 is not broken or torn by the force provided by the object, so that the thermoelectric element 140 does not leak out.

In addition, the sealant 130 has elasticity and flexibility, so that the first and second contact members 110 and 120 are pressed by an external force, as will be described later.

Preferably, the sealing material 130 has elasticity, so that when the first and second contact members 110 and 120 are pressed by an external force, the heat transfer unit 100 moves to the opposite side due to the elastic restoring force of the sealing material 130. Make good elastic contact with the object.

The sealant 130 may be formed, for example, by printing or dispensing a liquid silicone rubber adhesive on the edge of any one of the first and second contact members 110 and 120, then placing another contact member thereon and curing the adhesive. there is. That is, the liquid silicone rubber adhesive is a curable material having elasticity, flexibility, and elasticity having adhesive strength with an opposing object after curing, and reliably seals the inside of the heat transfer unit 100.

Therefore, it is preferable that the flowability or spreadability of the thermoelectric element 140 be better than that of the sealant 130 .

As such, the sealant 130 may be silicone rubber containing thermally conductive powder and having elasticity, flexibility, and elasticity. If the thermal conductivity of the sealant 130 is high, mechanical hardness increases, so the thermal conductivity is 0.5W/mK to 2W/mK. may be of a degree.

In addition, the thickness of the sealant 130 is not limited, but may be preferably 0.1 mm to 1 mm in consideration of the curing speed, heat transfer effect, and degree of sealing, and is preferably formed continuously with a constant thickness to form a closed loop make up

Preferably, the thickness of the sealant 130 may be thick to accommodate as many thermoelectric elements 140 as possible or to achieve good elasticity performance.

The width of the sealing material 130 has a larger dimension than the height with good adhesion, and considering the distance that can be pressed, the height of the sealing material 130 can be greater than the thickness of any one of the first and second contact members 110 and 120 there is.

Since the silicone rubber constituting the sealant 130 has elasticity, flexibility, and elasticity, when the manufactured heat transfer unit 100 is bent or folded, the sealant 130 does not form cracks and can maintain a reliable seal. there is.

The thermoelectric element 140 may be liquid silicone rubber or various rubbers in which thermally conductive powder having self-adhesiveness or thermally conductive fibers are uniformly mixed.

The thermoelectric element 140 has viscosity, and can easily spread or flow horizontally by an external force applied vertically due to flowability and spreadability according to viscosity.

In the present invention, the thermal element 140 may be in the form of a thermally conductive gel having a high viscosity or a thermally conductive grease having a medium viscosity.

The thermal conductivity of the thermoelectric element 140 may be, for example, about 1W to 10W, and the lower the thermal conductivity, the more the grease state, and the higher the thermal conductivity, the more the gel state.

Therefore, the manufactured heat transfer unit 100 may have a flat shape or a bent shape by the sealing material 130 having elasticity, flexibility, and elasticity, and when pressed by being interposed with an opposing object, the thermoelectric element 140 While spreading sideways, the heat transfer unit 100 becomes thinner while being pressed.

Hereinafter, a process of making the heat transfer unit 100 of the present invention will be described.

A closed-loop sealing material 130 is formed by continuously printing or dispensing a liquid silicone rubber adhesive on a predetermined portion along the edge of the second contact member 110 (hereinafter referred to as a 'sealing portion').

Subsequently, the thermoelectric element 140 is discharged so as not to contact the sealing material 130 as much as possible by using a dispenser or the like into a space formed with the second contact member 110 as the bottom and the sealing material 130 as a side wall.

Although the discharge amount of the thermoelectric element 140 is not specified, it may be discharged to an extent that occupies 50% to 90% of the internal space 102 formed by covering the first contact member 110 .

The thermoelectric element 140 may be a liquid silicone rubber having self-adhesive force in which thermally conductive powder or thermally conductive fibers are uniformly mixed, and may be in a gel state having high viscosity and having spreadability, or having a medium viscosity and having flowability It may be in a grease state with

Thereafter, the sealant formed along the edge of the first contact member 110 is brought into contact with the upper surface of the sealant 130, and then the sealant 130 is cured so that the sealant 130 is formed on the first and second contact members 110 and 120. ) to be bonded to the sealing part by curing.

Here, the curing condition of the sealant 130 varies depending on the material of the liquid silicone rubber adhesive corresponding to the sealant 130, but is caused by heat or moisture.

Therefore, since the sealing material 130 formed of liquid silicone rubber is not completely cured at the initial stage and has final adhesive strength after final curing, the sealing material 130 is formed on the second contact member 120. After discharging the thermoelectric element 140, it is necessary to adjust working conditions so that the sealant 130 is not finally cured until the first contact member 110 is covered.

To this end, the thermoelectric element 140 is first discharged on the second contact member 120 before forming the sealant 130 by changing the order, and then the sealant 130 is formed, and the second contact member 110 is immediately applied to the sealant ( 130) and then cured so that the sealant 130 and the first contact member 110 are completely bonded to each other.

Preferably, the heat transfer unit 100 is formed in a plate shape to make surface contact with the object in many parts, and has a thin thickness to facilitate heat transfer within a possible range.

Figure 2 shows the operation of the heat transfer unit.

In FIG. 2, the dotted line shows the position before being pressed by an external force.

When an external force is applied to the upper surface of the first contact member 110 in a state in which the thermoelectric element 140 is filled to occupy approximately 80% of the inner space, the thermoelectric element 140 in the inner space makes the first contact While being pressed by the member 110, it starts filling the empty space inside.

At this time, air existing in the empty space is discharged through the through hole 112 as indicated by an arrow, and the thermoelectric element 140 spreads or flows into the empty space.

In this process, the sealing material 130 may be deformed so that both sides bulge outward due to elasticity, flexibility, and elasticity.

As a result, although it depends on the degree to which the first contact member 110 is pressed, when it is pressed to the maximum as shown in FIG. 2, a small part of the internal space communicating with the through hole 112 is empty. almost fills the interior space.

If there is no through hole 112 and there is no gap through which the air existing in the empty space is exhausted by pressing force, the air having a better flow than the thermoelectric element 140 is directed to a portion where force is not applied, and the portion is partially released. However, it may not have a significant effect on heat transfer unless the raised area is in contact with the heat source.

3 shows a heat transfer unit according to another embodiment of the present invention.

The heat transfer unit 200 is bonded along the edge between the first and second contact members 210 and 220 of thermal conductivity facing each other, and the first and second contact members, respectively, to provide flexibility and elasticity for sealing the internal space. It consists of a sealing material 230, a thermoelectric element filling a part of the inner space, and a thermally conductive adhesive sheet 250 having self-adhesiveness that is adhered to the lower surface of the second contact member 220.

In this embodiment, the adhesive sheet 250 is adhered to the lower surface of the second contact member 220 as an example, but the adhesive sheet 250 may be adhered to the upper surface of the first contact member 210 or both. can

According to this structure, the heat transfer unit 200 can be attached to an object, for example, at least one of a cooling body and a heat source.

4 shows a heat transfer unit according to another embodiment of the present invention.

The heat transfer unit 300 includes a solid contact member 310 having thermal conductivity formed as a single body and formed with first and second contact portions 312 and 314 bent at one side and facing each other, except for one side. The sealing material 330 adheres between the first and second contact portions 312 and 314 in .

In this case, an advantage such as increased mechanical strength of the heat transfer unit 300 provided by the bent portion may be obtained.

5 shows a heat transfer unit according to another embodiment of the present invention.

The heat transfer unit 400 of this embodiment is composed of a single body 410 made of a silicone rubber material having flexibility, stretchability, and elasticity, and first and second contact portions 412 and 414 open at one side and facing each other are formed. .

For example, it has the shape of a housing having first and second contact portions 412 and 414 formed flat and having an internal space formed therein.

Although the size is not particularly limited, a sealing material 430 having flexibility, elasticity, and elasticity for sealing the internal space by bonding the first and second contact portions 412 and 414 to each other is formed in the opening formed on one side.

According to this structure, all parts except for the sealant 430 formed in the open portion are composed of a single body 410 made of silicone rubber, and when an external force is applied perpendicularly to the contact portion, the single body 410 itself is stretchable by elasticity. Since the internal space is increased while being stretched, the thermoelectric element in the internal space spreads in the direction in which the heat transfer unit 400 is pressed, making the heat transfer unit 400 thinner.

Preferably, the single body 410 is provided by impregnating an instrument corresponding to the shape of the single body 410 into liquid silicone rubber, curing it, and removing it from the instrument.

When the single body 400 is damaged by an external force, the internal thermoelectric element is preferably applied in a gel state having a relatively high viscosity so that the thermoelectric element inside does not escape to the outside.

In some cases, mechanical aids for protecting the single body 400 may be mounted on certain parts of the single body 400 .

The heat transfer unit 400 can be applied when the distance between opposing objects is large, there are multiple distances, or a large area.

Although the above has been described based on the embodiments of the present invention, it goes without saying that various changes can be made at the level of those skilled in the art. Therefore, the scope of the present invention should not be construed as being limited to the above-described embodiments, and should be interpreted by the claims described below.

100: heat transfer unit
102: inner space
110: first contact member
112: through hole
120: second contact member
130: sealing material
140: thermoelectric element

Claims (21)

A heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat from the heating source to the cooling body,
solid first and second contact members facing each other and having respective thermal conductivity;
a sealant having elasticity and flexibility for bonding and sealing the first and second contact members along edges of opposite surfaces of the first and second contact members;
an inner space formed by the sealing material between the first and second contact members; and
Filling a part of the inner space and including a filled thermoelectric element having flowability or spreadability,
When the force provided by the object presses the sealing material and the thermoelectric element, the thermoelectric element flows or spreads in the internal space by the flowability or the spreadability, so that the thickness of the heat transfer unit is reduced. . In claim 1,
The heat transfer unit, characterized in that the first and second contact members are two independently separated contact members or a single contact member connected at one side. In claim 2,
In the case of the two separated contact members, the heat transfer unit, characterized in that the sealing material forms a closed loop. In claim 2,
In the case of a single contact member connected to each other at the one side, the heat transfer unit, characterized in that the sealing material is continuously formed except for the connected portion. In claim 2,
The heat transfer unit, characterized in that the size and shape of the first and second contact members are the same or different from each other. In claim 1,
The first and second contact members are each a metal sheet including copper, copper alloy, aluminum or an aluminum alloy, or a thermally conductive polymer sheet including a thermally conductive rubber sheet, or a combination thereof. In claim 6,
A heat transfer unit, characterized in that a thermally conductive adhesive sheet is adhered to at least one surface exposed to the outside of the metal sheet and the polymer sheet. In claim 6,
The heat transfer unit, characterized in that the polymer sheet has a self-adhesive force. In claim 1,
A heat transfer unit, characterized in that a graphite layer is formed on a part between the opposing surfaces of the first and second contact members. In claim 1,
The heat transfer unit, characterized in that the sealing material is continuously formed with a predetermined thickness and width. In claim 1,
The heat transfer unit according to claim 1 , wherein the sealant is bonded by hardening after liquid rubber corresponding to the sealant is formed by printing or dispensing. In claim 1,
The heat transfer unit, characterized in that the sealing material is silicone rubber having elasticity. In claim 12,
The heat transfer unit, characterized in that the silicone rubber is thermally conductive. In claim 1,
The heat transfer unit, characterized in that the thermoelectric element, occupies 50% to 90% of the total volume of the inner space. In claim 1,
The heat transfer unit, characterized in that through-holes are formed in some of the first and second contact members. In claim 15,
The heat transfer unit, characterized in that when the heat transfer unit is pressed, the air in the internal space escapes through the through hole. In claim 15,
The heat transfer unit, characterized in that when the heat transfer unit is pressed, the thermoelectric element in the inner space does not escape through the through hole. In claim 1,
The heat transfer unit, characterized in that the thermoelectric element is a liquid thermally conductive silicone rubber mixed with thermally conductive powder, and is in a gel or grease state. In claim 1,
The heat transfer unit, characterized in that the flowability or spreadability of the thermoelectric element is better than the flowability or spreadability of the sealing material. A heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat from the heating source to the cooling body,
a solid contact member having thermal conductivity formed as a single body and having first and second contact portions bent at one side and facing each other;
a thermally conductive sealant having elasticity and flexibility formed along opposite edges of the first and second contact portions to seal the contact member;
an inner space formed by the sealing material between the first and second contact portions; and
Filling a part of the inner space and including a filled thermoelectric element having flowability or spreadability,
When the force provided by the object presses the sealing material and the thermoelectric element, the thermoelectric element flows or spreads in the internal space by the flowability or the spreadability, so that the thickness of the heat transfer unit is reduced. . A heat transfer unit interposed between a heating source and a cooling body, which are opposite objects, and used to transfer heat from the heating source to the cooling body,
a rubber housing composed of a single body, having an opening formed on one side, and having first and second contact portions facing each other;
a thermally conductive sealing material formed by sealing the opening and having elasticity and flexibility to which the first and second contact portions are bonded;
A thermoelectric element filling a part of the inner space of the housing and having flowability or spreadability filled therein;
When the housing is pressed by the force provided by the object, the thermoelectric element flows or spreads in the internal space by the flowability or the spreadability, so that the thickness of the heat transfer unit is reduced.

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