阅读说明：本技术 真空绝热体及冰箱 (Vacuum insulator and refrigerator ) 是由 丁元荣 尹德铉 李成燮 金大雄 金素拉 于 2016-08-02 设计创作，主要内容包括：一种真空绝热体包括：第一板构件；第二板构件；密封部；支撑单元；抗热单元；以及排气端口,其中,向第三空间延伸以联接到支撑单元的延伸部被设置到第一板构件和第二板构件中的至少一者,而且延伸部被形成为从第一板构件和第二板构件中的至少一者的边缘部向下延伸。(A vacuum heat insulator comprising: a first plate member; a second plate member; a sealing part; a support unit; a heat-resistant unit; and an exhaust port, wherein an extension portion extending to the third space to be coupled to the support unit is provided to at least one of the first plate member and the second plate member, and the extension portion is formed to extend downward from an edge portion of at least one of the first plate member and the second plate member.)

1. A vacuum thermal insulator, comprising:

a first plate;

a second plate;

a sealing part sealing the first plate and the second plate to provide a third space, the third space being in a vacuum state;

a support portion supporting the first plate and the second plate and disposed in the third space;

an exhaust port through which gas in the third space is exhausted;

at least one radiation-resistant sheet disposed in the third space in a plate shape to reduce an amount of heat transfer between the first plate and the second plate; and

a plurality of rods sandwiched between the first plate and the second plate,

wherein the radiation-resistant sheet includes holes through which the plurality of rods pass.

2. The vacuum thermal insulator of claim 1, wherein the radiation-resistant sheet has at least one first hole having a first diameter and at least one second hole having a second diameter, the second diameter being larger than the first diameter, such that the rod is inserted into the first and second holes.

3. The vacuum thermal insulator of claim 2, wherein the number of first holes is less than the number of second holes.

4. The vacuum thermal insulator of claim 2, wherein the first hole is provided at a vertex of the radiation-resistant sheet.

5. The vacuum thermal insulator of claim 4, wherein an edge of the radiation-resistant sheet extends 10mm to 15mm from the first hole.

6. The vacuum thermal insulator of claim 2, wherein a diameter of the first hole corresponds to a dimension resulting from an assembly tolerance plus an outer diameter of the rod.

7. The vacuum thermal insulator according to claim 2, wherein the radiation-resistant sheets are provided in at least two, and a gap block is provided in a gap portion between the radiation-resistant sheets.

8. The vacuum thermal insulator of claim 7, wherein the spacer block is supported by the rod and inserted into the first hole.

9. The vacuum thermal insulator of claim 7, wherein an outer diameter of the spacer block is greater than the first diameter of the first hole.

10. The vacuum thermal insulator of claim 1, wherein at least one of the first plate and the second plate includes an extended protrusion extending into the third space to couple to the support portion,

wherein the extension protrusion extends from at least one of the first plate and the second plate,

wherein the support portion includes a fixing bracket contacting the extension protrusion to support at least one of the first plate and the second plate.

Technical Field

The present disclosure relates to a vacuum heat insulator and a refrigerator.

Background

Vacuum thermal insulation is a product used to inhibit heat transfer by drawing a vacuum in its body. The vacuum insulator can reduce heat transfer by convection and conduction, and thus is applied to heating devices and cooling devices. In a conventional heat insulating method applied to a refrigerator, a foamed polyurethane heat insulating wall having a thickness of about 30cm or more is generally provided (although it is variously applied to refrigeration and freezing). However, the inner volume of the refrigerator is thus reduced.

In order to increase the internal volume of the refrigerator, application of a vacuum insulator to the refrigerator is attempted.

First, korean patent No. 10-0343719 (reference 1) of the present applicant has been disclosed. According to reference 1, a method is disclosed in which a vacuum insulation panel is prepared and then installed in a wall of a refrigerator, and the outside of the vacuum insulation panel is finished with a separate molding member such as styrofoam (polystyrene). According to the method, additional foaming is not required, and the heat insulation performance of the refrigerator is improved. However, the manufacturing cost increases and the manufacturing method is complicated. As another example, korean patent laid-open publication No. 10-2015-0012712 (reference 2) discloses a technique (method) of providing walls using a vacuum insulation material and additionally providing insulation walls using a foam filling material. According to reference 2, the manufacturing cost increases, and the manufacturing method is complicated.

As another example, attempts have been made to manufacture all the walls of a refrigerator using a single product vacuum insulation. For example, U.S. patent publication No. US2040226956a1 (reference 3) discloses a technique for providing a heat insulating structure of a refrigerator in a vacuum state. However, it is difficult to obtain a practical level of heat insulation effect by providing the wall of the refrigerator in a sufficiently vacuum state. In particular, it is difficult to prevent heat transfer from occurring at the contact portion between the outer case and the inner case having different temperatures. In addition, it is difficult to maintain a stable vacuum state. Further, it is difficult to prevent the deformation of the housing due to the sound pressure in the vacuum state. Due to these problems, the technique of reference 3 is limited to a low-temperature refrigeration apparatus, and is not suitable for a refrigeration apparatus for general household use.

Disclosure of Invention

Technical problem

Drawings

Fig. 1 is a perspective view of a refrigerator according to an embodiment.

Fig. 2 is a view schematically showing a main body of a refrigerator and a vacuum heat insulator according to an embodiment.

Fig. 3 is a view showing a plurality of embodiments of an internal structure of a vacuum space part.

Fig. 4 is a view showing embodiments of the conductive resistance sheet and a peripheral portion thereof.

Fig. 5 is a view showing in detail a vacuum heat insulator according to a second embodiment.

Fig. 6 is a view illustrating a state in which a radiation resistant sheet is fastened to the support unit of fig. 5.

Fig. 7 is a sectional view taken along line I-I' of fig. 6.

Fig. 8 is a sectional view taken along line II-II' of fig. 6.

Fig. 9 is a plan view of one vertex portion (vertex portion) of the radiation shield of fig. 5.

Fig. 10 shows a graph representing the change in the heat insulating property with respect to the vacuum pressure and the change in the gas conductivity by using a simulation.

Fig. 11 is a graph showing the time and pressure variation of the process of exhausting the inside of the vacuum thermal insulator when the supporting unit is used, which is obtained by observation.

Fig. 12 shows a graph obtained by comparing the vacuum pressure and the gas conductivity.

Fig. 13 is a view illustrating association (correlation) between a support unit of a vacuum heat insulator and a first plate member according to a third embodiment, which illustrates any one of edge portions.

Fig. 14 is an enlarged view of fig. 13.

Fig. 15 is a longitudinal sectional view of fig. 13.

Fig. 16 is a view illustrating the support unit and the radiation shield of fig. 13.

Fig. 17 is a plan view of fig. 16.

Fig. 18 is a view showing a vacuum heat insulator according to a fourth embodiment.

Fig. 19 is a view showing the first plate member of fig. 18.

Fig. 20 is a view showing a vacuum heat insulator according to a fifth embodiment.

Fig. 21 is a view showing a vacuum heat insulator according to a sixth embodiment.

Fig. 22 is a longitudinal sectional view of fig. 21.

Fig. 23 is a view showing a vacuum heat insulator according to a seventh embodiment.

Fig. 24 is a view illustrating the supporting unit of fig. 23.

Fig. 25 is an exploded view of the support unit of fig. 23.

Fig. 26 is a view illustrating a case where a plurality of radiation resistant sheets are provided in the supporting unit of fig. 23.

Fig. 27 is a view showing the supporting unit of fig. 23, as viewed from above.

Fig. 28 is a view illustrating one side of the supporting unit of fig. 23.

Fig. 29 is a view illustrating an edge portion of the support plate of fig. 23.

Embodiments provide a vacuum heat insulator and a refrigerator capable of obtaining a sufficient heat insulating effect in a vacuum state and being commercially used.