An adiabatic material structure and an adiabatic and heat-insulating door body

Abstract

The present invention discloses an adiabatic material structure and an adiabatic and heat-insulating door body, belonging to the technical field of adiabatic energy conservation. It includes more than one layer of adiabatic material layers combined together, and support particles with a low outgassing rate are distributed between adjacent two layers of the adiabatic material layers and / or inside the adiabatic material layers. Aiming at the technical problems of low vacuum pumping efficiency and poor high-vacuum stability maintenance in the existing vacuum adiabatic panel, the present invention provides an adiabatic material structure and an adiabatic and heat-insulating door body, which can improve the vacuum pumping efficiency and maintain a high-vacuum state for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal insulation and energy conservation, and particularly relates to a thermal insulation material structure and a thermal insulation door body. Background Art

[0002] For high-vacuum insulation, it is generally required to maintain a vacuum degree of less than 1.33×10 -2 Pa in the insulation space, and the outgassing rate ≤ 5.0×10 -7 Pa·m 3 / s. In this way, the convective heat transfer of gas and most of the residual gas heat conduction can be eliminated, achieving a good insulation effect. High-vacuum multi-layer insulation usually uses dozens of metal films with high reflectivity as the reflective layer and low-thermal-conductivity spacer materials as the spacer layer, alternately combined. The vacuum jacket and the multi-layer insulation material therein form a complete high-vacuum multi-layer insulation structure, which can limit heat transfer through the three ways of conduction, convection, and radiation to the greatest extent. When the inside of the door body is pumped to a high vacuum of 1.33×10 -2 Pa or better vacuum degree, and the outgassing rate ≤ 5.0×10 -7 Pa·m 3 / s, and when the insulation material is reasonably perforated (slotted), the heat transfer through convection is basically zero, and the multi-layer insulation structure is mainly used to contain heat transfer through the two ways of conduction and radiation.

[0003] In the existing vacuum metal insulated door body, multiple groups of metal supports are arranged in the jacket or the jacket is made of foamed material foam polystyrene. For the vacuum door body made of metal supports, the deformation of the door body after evacuation is well prevented, but the conduction heat is large, the weight is heavy, and the heat preservation performance is poor; for the door body made of foamed material foam polystyrene, the weight is lighter, but the volume is large, the foamed material needs to be made very thick, and the heat preservation performance is average.

[0004] At the same time, in order to improve the heat preservation and insulation effect, for example, Chinese Patent No. CN209026391U, publication date June 25, 2019, discloses a composite vacuum insulation device board, including a metal plate, a vacuum insulation board and a vacuuming door. The vacuum insulation board is provided with an inner filling core material and an outer filling core material, having a heat preservation and insulation effect. However, in the above patent, the inner filling core material and the outer filling core material are likely to be closely attached together, resulting in the inability to quickly exhaust the gas between the two and within the material itself, and the gas exhaustion is not thorough, thus affecting the vacuum degree inside the insulation device board. Summary of the Invention

[0005] 1. Technical Problems to be Solved by the Invention

[0006] In view of the technical problems of low vacuum pumping efficiency and poor high vacuum stability in the prior art, the present invention provides an adiabatic material structure and an adiabatic and heat-insulating door body, which can improve the vacuum pumping efficiency and maintain a high vacuum state for a long time.

[0007] 2. Technical Solution

[0008] To solve the above problems, the technical solution provided by the present invention is as follows:

[0009] An adiabatic material structure includes more than one layer of adiabatic material layers combined together, and low outgassing rate support particles are distributed between adjacent two layers of the adiabatic material layers and / or inside the adiabatic material layers.

[0010] Based on the design of using multiple layers of adiabatic material layers to improve the adiabatic and heat-insulating performance, the present invention adopts the setting method of low outgassing rate support particles, so that the adiabatic and heat-insulating door body can maintain a high vacuum state for a long time, thereby ensuring the adiabatic and heat-insulating performance of the adiabatic and heat-insulating door body. At the same time, the support particles can reduce the direct contact area between adjacent two layers of the adiabatic material layers, reduce the contact transfer of heat, and make the adiabatic material structure have a good heat insulation effect.

[0011] Optionally, the support particles are made of a material with a thermal conductivity not greater than 0.2 W / m·K. The material with a lower thermal conductivity can effectively reduce the heat transfer efficiency between two layers of adiabatic material layers 1 in the spaced state.

[0012] Optionally, the adiabatic material layer includes a first reflection layer and a second reflection and flame retardant layer combined together in sequence. The first reflection layer and the second reflection cooperate to make there be almost no temperature gradient in the space of the adiabatic and heat-insulating door body, reduce the radiation heat transfer, and the flame retardant layer plays a role in heat insulation and flame retardance.

[0013] Optionally, more than one layer of the adiabatic material layers combined together are stitched together by multiple fireproof wires. The multiple fireproof wires play a role in fixing the multiple layers of adiabatic material layers, and can effectively prevent the support particles from accumulating between two layers of adiabatic material layers.

[0014] Optionally, the edge of the adiabatic material layer is covered by a fireproof edge. The fireproof edge plays a role in fixing the edge of the adiabatic material layer and prevents the support particles from falling from between two layers of adiabatic material layers.

[0015] An adiabatic and heat-insulating door body includes two relatively arranged metal door panels, the above-mentioned adiabatic material structure clamped between the two metal door panels, and a support component for restricting the deformation of the metal door panels. The adiabatic material structure and the support component cooperate to support the metal door panels, so as to achieve a better support effect on the adiabatic and heat-insulating door body after vacuum forming, and effectively prevent the door body from deforming due to the reduction of internal pressure after vacuum pumping.

[0016] Optionally, the support assembly includes multiple support bases mounted on the metal door panel. Each support base includes an inner support portion, an outer support portion, and a connecting rod for connecting the inner and outer support portions. The metal door panel is provided with fixing holes that mate with the connecting rods. The simultaneous support of the inner and outer support portions provides better support than a single support portion. The multiple support bases ensure uniform force distribution across all parts of the metal door panel, effectively preventing localized deformation.

[0017] Optionally, the inner support portion is a hollow ring sleeved on one end of the connecting rod. Compared with the one-piece structure, the above-mentioned splicing structure helps to reduce the difficulty of installing the support base on the metal door panel.

[0018] Optionally, the support base is provided with a heat-insulating structure for reducing the contact area. The heat-insulating structure serves to reduce the contact area and increase the contact thermal resistance, thereby ensuring good heat insulation performance between the support base 1 and the heat-insulating material structure, and minimizing the heat transfer through the heat transfer.

[0019] Optionally, the support seat is provided with a guide groove. When the door is evacuated to a vacuum state, the gas inside the heat-insulating door body can be quickly discharged outwards through the guide groove, thereby improving the gas discharge efficiency.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0022] (1) Multi-layer insulation material layers can significantly reduce heat leakage of the insulation structure and improve the insulation performance.

[0023] (2) The arrangement of the supporting particles allows a certain gap to exist between two adjacent layers of the thermal insulation material so that they do not stick together, thereby avoiding contact transfer of heat and making the thermal insulation material structure have a good thermal insulation effect.

[0024] (3) The arrangement of the supporting particles makes it easier to discharge the gas between two adjacent layers of thermal insulation material, thereby ensuring the thermal insulation performance of the thermal insulation door body.

[0025] (4) The heat is reflected multiple times by the first and second reflective layers, and is absorbed very little by the multi-layer insulation material, so that there is almost no temperature gradient in the insulation door space, reducing radiation heat exchange.

[0026] (5) The support assembly cooperates with the insulation material structure to support the left and right ends of the insulation door body. The insulation door body is supported from top to bottom, left to right, and effectively prevents the door body from being deformed due to excessive internal pressure after vacuuming. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a thermal insulation material structure in the present invention;

[0028] Figure 2 It is a schematic layer structure diagram of the thermal insulation material layer in the present invention;

[0029] Figure 3 It is a side view of a thermal insulation and heat preservation door body in the present invention;

[0030] Figure 4 It is a front view of a thermal insulation and heat preservation door body in the present invention;

[0031] Figure 5 It is a schematic sectional view of a thermal insulation and heat preservation door body in the present invention;

[0032] Figure 6 is Figure 5 a partial enlarged schematic view of part A in

[0033] 1. Thermal insulation material layer; 11. First reflection layer; 12. Second reflection; 13. Flame retardant layer; 2. Support particles; 3. Fire prevention line; 4. Fire prevention edge; 5. Metal door panel; 51. Fixed hole; 6. Support assembly; 61. Support seat; 611. Inner support part; 612. Outer support part; 613. Connecting rod; 614. Flow guiding groove. Specific implementation mode

[0034] To further understand the content of the present invention, the present invention will be described in detail in combination with the attached Figures 1-5 drawings and embodiments.

[0035] Embodiment 1

[0036] In combination with the attached Figure 1 and 2 drawings, a thermal insulation material structure of this embodiment includes more than one layer of thermal insulation material layer 1 combined together. Low outgassing rate support particles 2 are distributed between adjacent two layers of the thermal insulation material layer 1 and inside the thermal insulation material layer 1. In other embodiments, the support particles 2 can be only arranged between adjacent two layers of the thermal insulation material layer 1 or only arranged inside the thermal insulation material layer 1.

[0037] Regarding the concept of outgassing rate, any solid material can dissolve and adsorb some gases in the atmospheric environment. When the material is placed in a vacuum, it will outgas due to desolution and desorption. For general vacuum equipment, the outgassing of the material is the main gas source of the vacuum system. The low outgassing rate means releasing relatively less gas in the same time to reduce the influence on the vacuum state. The low outgassing rate is common knowledge in this field, so it will not be elaborated here.

[0038] By setting up multiple layers of thermal insulation materials, the heat leakage of the thermal insulation structure can be significantly reduced, and the thermal insulation performance can be improved; the setting of the support particles 2 makes there be a certain gap between two adjacent thermal insulation material layers 1 so that they will not stick together. In a vacuum state, this gap can reduce the direct contact area between two adjacent thermal insulation material layers 1, reduce the contact heat transfer, and make the thermal insulation material structure have a good heat insulation effect; the setting of the support particles 2 increases the gaps between two adjacent thermal insulation material layers 1 and inside the thermal insulation material layer 1. During the vacuum pumping operation, the gas release between the thermal insulation material layers 1 and inside the thermal insulation material layer 1 is more efficient and thorough. When applying the thermal insulation material structure with less gas content to the thermal insulation door body, the thermal insulation door body can maintain a high vacuum state for a long time, thus ensuring the thermal insulation performance of the thermal insulation door body; the support particles 2 are made of a material with a low outgassing rate. During the vacuum pumping operation, the support particles 2 release less gas, which can reduce the vacuum pumping time and quickly discharge the internal gas; at the same time, it can prevent the support particles 2 from releasing a large amount of gas and affecting the high vacuum state inside the thermal insulation door body, and can maintain the high vacuum state for a long time; when the thermal insulation material structure is pre-treated by vacuum drying at 120°C, the setting of the support particles 2 makes the moisture adsorbed and other gases wrapped during the processing of the thermal insulation material layer 1 be discharged more efficiently and thoroughly.

[0039] Example 2

[0040] Combined with the attached Figure 1 and 2 For a thermal insulation material structure of this embodiment, compared with Embodiment 1, the support particles 2 are made of a material with a thermal conductivity not greater than 0.2 W / m·K.

[0041] Materials with a thermal conductivity not greater than 0.2 W / m·K have poor thermal conductivity. When the support particles 2 made of such materials contact the thermal insulation material layer 1, the heat transfer efficiency between the two thermal insulation material layers 1 in the spaced state can be effectively reduced; in this embodiment, the support particles 2 are bead-shaped particles made of glass with a diameter of 0.2 - 1 mm. At the same time, the glass material has a low outgassing rate in the vacuum state, which can reduce the heat conduction efficiency while reducing the impact on the vacuum state. At the same time, the thermal conductivity of glass is less than 0.2 W / m·K, with poor heat conduction effect and high temperature resistance; in other embodiments, the support particles 2 can be made of one of polycarbonate, calcium carbonate glass, and organic glass PMMA, and the support particles 2 of multiple materials can be used in combination. When the support particles 2 are bead-shaped particles, because the bead-shaped particles are more rounded than other shaped particles, it can prevent the support particles 2 from squeezing the thermal insulation material layer 1 when pumped to the vacuum state, causing damage to the thermal insulation material layer 1, and at the same time making the thermal insulation structure formed by the combination of multiple thermal insulation material layers 1 have a good support effect; in other embodiments, the shape of the support particles 2 is not limited and can be circular, three-dimensional, or irregular particle shapes, etc., as long as it can play a supporting role.

[0042] Example 3

[0043] Combined with the attached Figure 1 and 2 For an adiabatic material structure of this embodiment, compared with Embodiment 1 or 2, the thermal insulation material layer 1 includes a first reflective layer 11, a second reflection layer 12, and a flame retardant layer 13 combined together in sequence.

[0044] In a vacuum environment, the number of gas molecules decreases, the collisions between molecules decrease, and the heat exchange between molecules decreases. That is, the number of gas molecules migrating energy is very small. The heat is reflected multiple times by the first reflective layer 11 and the second reflection layer 12, and most of it is absorbed by the thermal insulation material layer 1. As a result, there is almost no temperature gradient in the adiabatic insulation door body space, which greatly reduces the radiation heat transfer. The flame retardant layer 13 plays a role in heat insulation and flame retardance; one of the optional embodiments is that the first reflective layer 11 is an aluminum foil, the second reflection layer 12 is a metal film, and the flame retardant layer 13 is a flame retardant glass fiber paper; another optional embodiment is that the first reflective layer 11 is a metal film, the second reflection layer 12 is an aluminum foil, and the flame retardant layer 13 is a flame retardant glass fiber paper.

[0045] In this embodiment, support particles 2 are interposed between the first reflective layer 11, the second reflection layer 12, and the flame retardant layer 13, so as to improve the adiabatic performance inside the thermal insulation material layer 1 and make it easier to maintain a high vacuum state than before.

[0046] Example 4

[0047] Combined with the attached Figure 1 and 2, A thermal insulation material structure of this embodiment, compared with any one of Embodiments 1-3, more than one layer of the thermal insulation material layer 1 combined together is stitched together by multiple fireproof lines 3. In this embodiment, the fireproof line 3 is a fiberglass line, and two fireproof lines 3 are distributed at a distance of 200-300 mm. Specifically, in practical applications, it can be 200 mm, 300 mm, 220 mm, or 280 mm and other values, which can be selected according to needs, and are sewn according to the Figure 2 style.

[0048] Multiple layers of thermal insulation material layers 1 are stitched together by multiple fireproof lines 3 distributed at equal intervals. The heating material layer 1 between two adjacent fireproof lines 3 forms a gap for fixing and supporting the support particles 2. The support particles 2 are filled in this gap to prevent the support particles 2 from accumulating between the two layers of thermal insulation material layers 1, so that the support particles 2 are stably and evenly distributed between two adjacent layers of thermal insulation material layers 1; an optional implementation is that multiple fireproof lines 3 are distributed at equal intervals. With the above distribution method, the distance between two adjacent fireproof lines 3 does not have too much difference, so that the support particles 2 can be evenly partitioned, avoiding the uneven accumulation of the support particles 2 from affecting the thermal insulation effect.

[0049] Embodiment 5

[0050] Combined with the attached Figure 1 and 2 , A thermal insulation material structure of this embodiment, compared with any one of Embodiments 1-4, the edge of the thermal insulation material layer 1 is covered by a fireproof edge 4; in this embodiment, the fireproof edge 4 is a fiberglass cloth, and the edge of the multi-layer thermal insulation material layer 4 is wrapped by folding the fiberglass cloth in half, and then the perimeter is sewn in a zigzag shape using fiberglass lines.

[0051] The cooperation of the fireproof edge 4 and the fireproof line 3 closes the gap for accommodating the support particles 2 between the two layers of thermal insulation material layers 1, so that the support particles 2 are stably filled in the corresponding gap, avoiding the dropping of the support particles 2, ensuring that the support particles 2 play a good supporting effect, and at the same time preventing the multi-layer thermal insulation material combination from loosening.

[0052] Embodiment 6

[0053] Combined with the attached Figures 1-6 , A thermal insulation door body of this embodiment includes two relatively arranged metal door panels 5, a thermal insulation material structure according to any one of Embodiments 1-5 sandwiched between the two metal door panels 5, and a support component 6 for restricting the deformation of the metal door panels 5.

[0054] In this embodiment, the metal door panel 5 is made of a stainless steel mirror thin plate with a small emissivity coefficient, high single-surface finish, and low temperature resistance. In a vacuum state, the heat conduction mainly occurs through radiation. Most of the heat radiated towards the metal door panel 5 is reflected, and only a very small part is absorbed by the metal door panel 5. After adopting the above adiabatic material structure, the adiabatic and heat-insulating door body has good adiabatic and heat-insulating performance. The adiabatic material structure supports the upper and lower ends of the adiabatic and heat-insulating door body when it is pumped to a vacuum state, thereby initially fixing the shape of the adiabatic and heat-insulating door body. At the same time, the support components 6 cooperate with the adiabatic material structure to support the left and right ends of the adiabatic and heat-insulating door body. The upper, lower, left, and right of the adiabatic and heat-insulating door body are all supported, effectively preventing the door body from deforming due to too small internal pressure after being evacuated. At the same time, the reaction forces of the support components 6 on both sides are applied to the adiabatic material structure, providing a good fixed support for the adiabatic material structure, which can press the two metal door panels 5 and the adiabatic material structure to prevent loosening or scattering. The adiabatic and heat-insulating door body adopting the above adiabatic material structure is small in volume, so its application fields are more extensive.

[0055] Embodiment 7

[0056] Combined with the attached Figures 1-6 , an adiabatic and heat-insulating door body of this embodiment, compared with Embodiment 6, the support component 6 includes a plurality of support seats 61 provided on the metal door panel 5. The support seat 61 includes an inner support portion 611, an outer support portion 612, and a connecting rod 613 for connecting the inner support portion 611 and the outer support portion 612. The metal door panel 5 is provided with fixing holes 51 that cooperate with the connecting rod 613.

[0057] By simultaneously pressing the inner support portion 611 and the outer support portion 612 against the inner and outer sides of the metal door panel 5, and the inner side of the inner support portion 611 against the adiabatic material structure. When the space between the two metal door panels 5 is pumped to a vacuum state, the metal door panel 5 deforms inwardly under the vacuum effect. At this time, the inner support portion 611 pressing against the metal door panel 5 and the adiabatic material structure can limit the inward deformation of the metal door panel 5. By supporting the metal door panel 5 with the inner and outer support portions simultaneously, compared with a single support portion, the support effect is better. The arrangement of multiple support seats 61 enables the metal door panel 5 to be evenly stressed, effectively avoiding local deformation.

[0058] Embodiment 8

[0059] Combined with the attached Figures 1-6 , an adiabatic and heat-insulating door body of this embodiment, compared with Embodiment 6 or 7, the inner support portion 611 is a hollow ring body sleeved on one end of the connecting rod 613.

[0060] The inner support portion 611 is a hollow ring, which is sleeved on one end of the connecting rod 613 opposite to the outer support portion 612. During installation, first pass the connecting rod 613 through the fixing hole 51 from the outside of the metal door panel 5 and make the outer support portion 612 rest against the outside of the metal door panel 5. At this time, the inner support portion 611 is sleeved on the connecting rod 613 at the inner end of the metal door panel 5 to complete the installation and fixation of the support seat 61. Compared with the one-piece molded structure, the above-mentioned splicing structure helps to reduce the difficulty of installing the support seat 61 on the metal door panel 5.

[0061] Example 9

[0062] Combined with attachment Figures 1-6 , a heat-insulating door body of this embodiment, compared with any one of embodiments 6-8, is provided with a heat-insulating structure for reducing the contact area on the support seat 61.

[0063] In this example, the thermal insulation structure is a rough surface on the contact surface between the support seat 61 and the thermal insulation material structure. The rough surface has low smoothness, so that when the support seat 61 contacts the end face of the thermal insulation material structure, the particles on the rough surface of the support seat 61 preferentially offset the end face of the thermal insulation material structure. At this time, the rough surface serves to reduce the contact area and increase the contact thermal resistance, so that the support seat 61 and the thermal insulation material structure have good thermal insulation performance and minimize the transfer of heat through heat transfer; in other embodiments, the thermal insulation structure can be a granular protrusion integrally formed on the contact surface between the support seat 61 and the thermal insulation material structure, or a groove formed by an inward depression on the contact surface between the support seat 61 and the thermal insulation material structure. The purpose of the above two embodiments is to reduce the contact area and increase the contact thermal resistance.

[0064] Example 10

[0065] Combined with attachment Figures 1-6 , a heat-insulating door body of this embodiment, compared with any one of embodiments 6-9, is provided with a guide groove 614 on the support seat 61.

[0066] In this embodiment, the guide groove is a cylindrical through hole that penetrates the support seat 61. When the support seat 61 is installed on the metal door panel 5, the cylindrical through hole is arranged horizontally. At this time, when it is evacuated to a vacuum state, the gas inside the insulated door body can be quickly discharged outward through the guide groove 614, thereby improving the gas discharge efficiency.

[0067] Example 11

[0068] This embodiment proposes a method for forming a heat-insulating door body, which includes placing a multi-layer insulation material structure between the processed metal door panels 5, placing the door body as a whole in a high vacuum obtaining device, and when the device is evacuated to 1.33×10 -2High vacuum of Pa or better vacuum degree, high-vacuum sealing inside the door body. This excellent heat insulation and heat preservation performance of the door body reduces convective and conductive heat transfer and greatly reduces radiative heat transfer, and can be widely applied to fields such as refrigerator heat preservation, fruit and vegetable freshness preservation, food storage, etc.

[0069] The above has schematically described the present invention and its implementation manners. This description is not restrictive, and what is shown in the drawings is only one of the implementation manners of the present invention. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, creatively design structural manners and embodiments similar to this technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A heat-insulating door body, comprising two oppositely disposed metal door panels, a heat-insulating material structure sandwiched between the two metal door panels, and a support assembly for limiting deformation of the metal door panels; The thermal insulation material structure comprises one or more thermal insulation material layers combined together, and support particles with low outgassing rate are distributed between two adjacent thermal insulation material layers and / or inside the thermal insulation material layers; The supporting particles are made of a material with a thermal conductivity of no more than 0.2 W / m·K; The thermal insulation material layer comprises a first reflective layer, a second reflective layer and a flame retardant layer which are sequentially combined; More than one layer of the thermal insulation material combined together is sewn together by a plurality of fireproof lines; The edges of the thermal insulation material layer are covered with fireproof edges; The heating material layer between the two connected fire lines forms a gap for fixing the support particles. The fire edge and the fire line cooperate so that the gap between the two layers of thermal insulation material for accommodating the support particles is closed by the fire edge and the fire line, so that the support particles are stably filled in the corresponding gap. The support assembly includes a plurality of support seats arranged on the metal door panel, the support seats include an inner support part, an outer support part and a connecting rod for connecting the inner support part and the outer support part, the metal door panel is provided with a fixing hole that cooperates with the connecting rod, and the support seat is provided with an insulation structure for reducing the contact area.

2. The heat-insulating door according to claim 1, characterized in that: The inner support portion is a hollow ring body sleeved on one end of the connecting rod.

3. The heat-insulating door according to claim 1, characterized in that: A guide groove is provided on the support seat.

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