Flow guide device and application thereof
By designing a flow guiding device, the problem of poor gas flow in the vacuum device was solved, achieving a higher vacuum level and faster pumping time, thus improving the thermal insulation performance of the vacuum insulation panel.
Patent Information
- Application Number
- CN202521224927.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-16
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-06-16
AI Technical Summary
In existing vacuum devices, gas flow is obstructed during the vacuuming process, resulting in the vacuum level failing to reach the expected level or device deformation, which affects the thermal insulation performance of the vacuum insulation panel.
Design a flow guiding device, including a flow guiding cover plate and a flow guiding base plate, with a converging air extraction hole and a flow guiding hole. The gas is gathered at the opening through the flow guiding groove and the flow guiding column, which shortens the gas flow path, avoids local gas accumulation, and improves the vacuum degree.
It achieves higher vacuum levels and faster pumping times, ensures a smooth surface for the vacuum device, and improves the thermal insulation performance of the vacuum insulation panel.
Smart Images
Figure CN223924283U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of vacuum flow guide, especially a flow guide device and its application. BACKGROUND
[0002] Vacuum insulation panel (VIP) is a kind of high-efficiency thermal insulation material, which is composed of core material and barrier layer. The core material usually adopts microporous silicate, fumed silica and other substances with extremely low thermal conductivity. These materials can effectively reduce heat conduction in a high-vacuum environment. The barrier layer generally uses multi-layer composite film, and its interior is extracted into a high-vacuum state through a special process, thereby greatly reducing the influence of heat convection.
[0003] The VIP has the characteristics of excellent heat preservation performance. Its thermal conductivity is usually only one-third of that of traditional heat preservation materials such as polystyrene foam (EPS) and mineral wool. This means that the thickness of VIP required to achieve the same heat preservation effect is much smaller than that of traditional heat preservation materials, especially suitable for limited space application scenarios such as refrigerators, refrigerated trucks, building exterior wall insulation, etc.
[0004] The vacuum environment of VIP greatly reduces the existence of gas molecules, thereby effectively reducing the heat transfer through the collision of gas molecules. Vacuum is the basis for achieving the high-efficiency heat insulation performance of VIP. It improves the heat insulation capacity of the material by reducing heat conduction and convective heat transfer, and protects the core heat insulation material from the influence of the external environment.
[0005] In the prior art, a certain surface of the vacuum device is generally opened to perform vacuumization. The air or other gas in the interior of the device is collected to the opening under the action of air pressure difference through the internal gap channel and is extracted, so that a vacuum chamber with a certain vacuum degree is formed in the interior of the device. The size of the vacuum degree is limited by the ability of the air extraction hole to collect gas and the smoothness of the gas flow in the interior of the device. In order to avoid the deformation of the barrier layer (i.e. the vacuum device shell) between the chamber of the vacuum device and the atmospheric environment, the interior of the device is generally filled with core material, and the barrier layer of the device is generally made of soft or soft and hard composite material.
[0006] When the device is vacuumized, the core material or outer packaging near the air extraction hole is compressed and closely adhered to each other due to local negative pressure, thereby blocking the channel for continuous outflow of gas in the interior of the device, so that the entire device cannot be vacuumized or the vacuum degree cannot reach the expected level. Similarly, the vacuum insulation panel also has this problem. INVENTION CONTENTS
[0007] The purpose of the utility model is to provide a flow guide device and its application. The flow guide device is mainly used for dredging and converging the gas in the device, so that the vacuum device can reach a higher vacuum degree level.
[0008] To solve the above technical problems, the technical solution of the utility model is:
[0009] A flow guide device, comprising a flow guide cover plate and a flow guide bottom plate, the center of the flow guide cover plate has a flow collection air extraction hole, the center of the flow guide bottom plate has a flow collection air guide hole,
[0010] The flow guide cover plate has a first top surface and a first bottom surface opposite to the first top surface, a plurality of upper flow guide grooves are arranged on the first bottom surface, the upper flow guide grooves are connected with the flow collection air extraction hole, a plurality of upper flow guide columns are arranged on the first bottom surface of the flow guide cover plate, the upper flow guide columns are distributed staggeredly with the upper flow guide grooves,
[0011] The flow guide bottom plate has a second top surface and a second bottom surface opposite to the second top surface, a plurality of lower flow guide grooves are arranged on the second top surface, the lower flow guide grooves are connected with the flow collection air guide hole, a plurality of lower flow guide columns are arranged on the second top surface of the flow guide bottom plate, the lower flow guide columns are distributed staggeredly with the lower flow guide grooves,
[0012] The first bottom surface of the flow guide cover plate is arranged opposite to the second top surface of the flow guide bottom plate, and the upper flow guide columns and the lower flow guide columns are distributed staggeredly.
[0013] Further, the upper flow guide columns are distributed in two circles with the flow collection air extraction hole as the center, and are respectively an inner circle upper column and an outer circle upper column, and the lower flow guide columns are distributed in one circle with the flow collection air guide hole as the center, and the lower flow guide columns are located in the annulus formed by the inner circle upper column and the outer circle upper column.
[0014] Further, a plurality of upper flow guide grooves are arranged on the first top surface, the flow collection air extraction hole is composed of a plurality of groups of holes, along the diameter direction, three circles of upper and lower through holes are arranged from inside to outside, and are respectively an inner circle upper hole, a middle circle upper hole and an outer circle upper hole, one side edge of the outer circle upper hole is connected with one upper flow guide groove of the first top surface, and the other side edge of the outer circle upper hole is connected with one upper flow guide groove of the first bottom surface.
[0015] Further, a plurality of lower flow guide grooves are arranged on the second bottom surface, the flow collection air guide hole is composed of a plurality of groups of holes, along the diameter direction, three circles of upper and lower through holes are arranged from inside to outside, and are respectively an inner circle lower hole, a middle circle lower hole and an outer circle lower hole, one side edge of the outer circle lower hole is connected with one lower flow guide groove of the second top surface, and the other side edge of the outer circle lower hole is connected with one lower flow guide groove of the second bottom surface.
[0016] Further, a plurality of upper flow guide branch grooves and a plurality of lower flow guide branch grooves are further included, each upper flow guide groove is connected with at least one upper flow guide branch groove, and each lower flow guide groove is connected with at least one lower flow guide branch groove.
[0017] Further, the upper flow guide branch grooves adopt Y-shaped joint flow collection, and the lower flow guide branch grooves adopt Y-shaped joint flow collection.
[0018] Further, the sectional area of each upper flow guide groove is equal to the sum of the sectional areas of the upper flow guide branch grooves that converge therewith, and the sectional area of each lower flow guide groove is equal to the sum of the sectional areas of the lower flow guide branch grooves that converge therewith.
[0019] Further, a plurality of upper flow guide grooves are arranged on the first top surface of the flow guide cover plate, and the upper flow guide grooves of the first top surface are connected with the converging air extraction holes, or a plurality of lower flow guide grooves are arranged on the second bottom surface of the flow guide bottom plate, and the lower flow guide grooves of the second bottom surface are connected with the converging air guide holes.
[0020] Further, a plurality of first through holes that penetrate to the first top surface are arranged at the converging positions of the upper flow guide grooves and the upper flow guide branch grooves on the first bottom surface of the flow guide cover plate, and a plurality of second through holes that penetrate to the second bottom surface are arranged at the converging positions of the lower flow guide grooves and the lower flow guide branch grooves on the second top surface of the flow guide bottom plate.
[0021] The utility model also provides a kind of vacuum insulation board, comprising: core material, flow guide device and cladding material, cladding material is wrapped the core material, and vacuum is formed between the core material;Flow guide device is installed on core material, and flow guide device is the flow guide device described above.
[0022] After using the above scheme, since the flow guide device is embedded at the opening in the utility model, the residual gas in each direction inside the device is converged at the opening through the flow guide groove and flow guide column of the flow guide device, the travel of gas flow is shortened, gas aggregation in local position is avoided, and the vacuum degree of the whole device is reduced. Meanwhile, compared with the prior art, the time to reach the same vacuum degree is shorter in the utility model, and higher vacuum degree and more flat air extraction hole sealing surface can also be obtained. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the structural schematic diagram of the utility model;
[0024] Figure 2 It is the explosion schematic diagram of the utility model Figure 1 ;
[0025] Figure 3 It is the explosion schematic diagram of the utility model Figure 2 ;
[0026] Figure 4 It is the sectional schematic diagram of the structure of the utility model;
[0027] Figure 5 It is the schematic diagram of the first top surface of the flow guide cover plate of the utility model;
[0028] Figure 6 It is the structural schematic diagram of the vacuum insulation board of the utility model in the direction of looking down;
[0029] Figure 7 It is Figure 6A-A direction cross-sectional view of the schematic diagram of the
[0030] Figure 8 is Figure 7 the local enlarged view at B in the
[0031] Figure 9 is the schematic diagram of the explosion of the vacuum insulation plate of the present utility model Figure 1 ;
[0032] Figure 10 is the schematic diagram of the explosion of the vacuum insulation plate of the present utility model Figure 2 ;
[0033] Figure 11 is the schematic diagram of another embodiment of the present utility model
[0034] Figure 12 is the schematic diagram of the structure of the present utility model in the upward direction of another embodiment
[0035] Figure 13 is the schematic diagram of the second top surface of the guide bottom plate of another embodiment of the present utility model
[0036] Explanation of reference numerals
[0037] converging air guiding hole 11 inner ring upper hole 111 middle ring upper hole 112
[0038] outer ring upper hole 113 first top surface 12 first bottom surface 13
[0039] upper guide groove 14 upper guide column 15 inner ring upper column 151
[0040] outer ring upper column 152 upper guide branch groove 16 first through hole 17
[0041] converging air guiding hole 21 inner ring lower hole 211 middle ring lower hole 212
[0042] outer ring lower hole 213 second top surface 22 second bottom surface 23
[0043] lower guide groove 24 lower guide column 25 lower guide branch groove 26 second through hole 27
[0044] core material 3 first recess 31 second recess 32 DETAILED DESCRIPTION
[0045] The present utility model will be further described in combination with the drawings and specific embodiments. It needs to be explained here that the technical features involved in each embodiment of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0046] The present utility model discloses a guide device, such as Figure 1, Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this is a preferred embodiment of the present invention, which includes a flow guide cover plate 1 and a flow guide base plate 2. The flow guide cover plate 1 has a converging air extraction hole 11 at its center, and the flow guide base plate 2 has a converging air guiding hole 21 at its center.
[0047] like Figure 2 As shown, the flow guide cover 1 has a first top surface 12 and a first bottom surface 13. The first top surface 12 and the first bottom surface 13 are arranged opposite to each other. A plurality of upper flow guide grooves 14 are provided on the first bottom surface 13. The upper flow guide grooves 14 are connected to the confluence air extraction hole 11. A plurality of upper flow guide columns 15 are provided on the first bottom surface 13 of the flow guide cover 1. The upper flow guide columns 15 are staggered from the upper flow guide grooves 14.
[0048] The guide cover 1 is installed below the suction port of the vacuum device and is attached parallel to the inner wall of the suction port. During suction, the gas in the 360° horizontal direction and the center of the longitudinal guide base plate 2 can be drawn into the suction port and discharged.
[0049] like Figure 3 As shown, the guide plate 2 has a second top surface 22 and a second bottom surface 23, which are arranged opposite to each other. A plurality of lower guide grooves 24 are provided on the second top surface 22. The guide plate 2 collects the gas from the bottom of the vacuum device in a 360° horizontal direction to the center of the plate, and then longitudinally gathers it to the center of the guide cover plate 1, from where it exits through the extraction hole. The lower guide grooves 24 are connected to the converging gas guide holes 21. A plurality of lower guide columns 25 are provided on the second top surface 22 of the guide plate 1, and the lower guide columns 25 are staggered from the lower guide grooves 24.
[0050] like Figure 4 As shown, the first bottom surface 13 of the guide cover plate 1 and the second top surface 22 of the guide base plate 2 are arranged opposite to each other, and the upper guide column 15 and the lower guide column 25 are staggered. When applied to a vacuum device, the lengths of the upper guide column 15 and the lower guide column 25 can be adjusted according to the thickness of the vacuum device.
[0051] Furthermore, a plurality of upper guide grooves 14 are provided on the first top surface 12 of the guide cover plate 1, or a plurality of lower guide grooves 24 are provided on the second bottom surface 23 of the guide bottom plate 2.
[0052] Alternatively, in other embodiments of this utility model, upper guide grooves 14 are provided on both the first top surface 12 and the first bottom surface 13. Alternatively, lower guide grooves 24 are provided on both the second top surface 22 and the second bottom surface 23.
[0053] like Figure 4As shown, further, the upper guide columns 15 are distributed in two circles, namely an inner circle upper column 151 and an outer circle upper column 152, with the converging air extraction hole 11 as the center. The lower guide columns 25 are distributed in one circle with the converging air guide hole 21 as the center. The lower guide columns 25 are located between the inner circle upper column 151 and the outer circle upper column 152, i.e. the lower guide columns 25 are located within the annular ring formed by the inner circle upper column 151 and the outer circle upper column 152. In this embodiment, there are 6 columns in each circle, which avoids mutual interference when the thickness of the vacuum device is small, and at the same time keeps a small air guide stroke between the guide columns.
[0054] Further, from the top view, the guide cover plate 1 and the guide bottom plate 2 are circular in shape. The circular structure is more uniform under stress and is less likely to deform.
[0055] Further, a plurality of upper guide grooves 14 are provided on the first top surface 12 and the first bottom surface 13. The converging air extraction hole 11 is composed of multiple groups of holes and communicates with the air extraction hole of the vacuum device. Along the diameter direction, from the inside to the outside, three circles of upper and lower through holes are arranged to form a mesh structure. They are the inner circle upper hole 111, the middle circle upper hole 112 and the outer circle upper hole 113. The edge position of one side of each outer circle upper hole 113 is connected with one upper guide groove 14 of the first top surface 12, and the edge position of the other side is connected with one upper guide groove 14 of the first bottom surface 13. In this embodiment, the inner circle upper hole 111 is a circular hole, the middle circle upper hole 112 has 6 holes, and the outer circle upper hole 113 has 6 holes, which are mainly used for converging the gas flowing from the longitudinal guide bottom plate. Moreover, the mesh structure can prevent the air extraction hole of the vacuum device from being blocked due to the deformation and extrusion of the core material during air extraction.
[0056] Further, a plurality of lower guide grooves 24 are provided on the second top surface 22 and the second bottom surface 23. The converging air guide hole 21 is composed of multiple groups of holes, and along the diameter direction, from the inside to the outside, three circles of upper and lower through holes are arranged, namely the inner circle lower hole 211, the middle circle lower hole 212 and the outer circle lower hole 213. The edge of one side of each outer circle lower hole 213 is connected with one lower guide groove 24 of the second top surface 22, and the edge of the other side is connected with one lower guide groove 24 of the second bottom surface 23. The converging air guide hole 21 is mainly used for converging the residual gas at the bottom surface of the vacuum device to the center and guiding it longitudinally to the converging air extraction hole 11, so as to shorten the gas flow stroke.
[0057] In another embodiment, the confluence extraction port 11 consists of multiple sets of holes, communicating with the extraction port of the vacuum device. Along the diameter direction, from the inside out, three concentric rings of holes are formed, creating a mesh structure. These are the inner ring upper hole 111, the middle ring upper hole 112, and the outer ring upper hole 113. Each outer ring upper hole 113 is connected to an upper guide groove 14 on the first bottom surface 13. The confluence guide port 21 consists of multiple sets of holes, along the diameter direction, from the inside out, three concentric rings of holes, from the inside out. These are the inner ring lower hole 211, the middle ring lower hole 212, and the outer ring lower hole 213. Each outer ring lower hole 213 is connected to a lower guide groove 24 on the second bottom surface 23. Firstly, the flow velocity and pressure difference are greatest when extraction occurs at the confluence location. The confluence extraction port 11 is made into a mesh structure to prevent the hollow core material from being extracted and blocking the extraction port, and also to avoid too many supports affecting airflow. In this embodiment, the venting hole 11 is made into three rings, which is a manifestation of a mesh structure. The hole 113 on the outer ring is connected to the upper guide groove 14 to facilitate the discharge of gas flowing through the upper guide groove 14. The hole 111 on the inner ring facilitates the discharge of gas from the middle and bottom of the core material. The hole 112 on the middle ring serves as a transition and buffer between the two pathways.
[0058] Furthermore, it also includes a plurality of upper guide channels 16 and a plurality of lower guide channels 26, wherein the upper guide channel 14 is connected to at least one upper guide channel 16, and the lower guide channel 24 is connected to at least one lower guide channel 26.
[0059] The cross-sectional area of each upper guide channel 14 is equal to the sum of the cross-sectional areas of the upper guide branch channels 16 that converge with it, and the cross-sectional area of each lower guide channel 24 is equal to the sum of the cross-sectional areas of the lower guide branch channels 26 that converge with it. For example... Figure 5 As shown, taking the first top surface of the guide cover plate 1 as an example, the upper guide branch channels 16 are connected to the outer edge of the guide cover plate 1, and their cross-sectional areas are S1 and S2 respectively. After the two upper guide branch channels 16 (S1 and S2) merge, they form a new upper guide branch channel 16, whose cross-sectional area S3 is the sum of the first two branches (i.e., S3 = S1 + S2). After merging with the third upper guide branch channel 16 (whose cross-sectional area is S4), it forms an upper guide channel 24. The cross-sectional area S5 of the upper guide channel 24 is the sum of the first three branches (i.e., S5 = S3 + S4 = S1 + S2 + S4).
[0060] In this embodiment, one of the functions of the upper guide groove 14 is to collect and transport the airflow from the upper guide branch groove 16 to the confluence exhaust port 11. The first top surface 12 and the first bottom surface 13 of the guide cover plate 1 each have six upper guide grooves 14. Each upper guide groove 14 is connected to the confluence exhaust port 11 at one end and to three upper guide branch grooves 14 at the other end. The cross-sectional area of the upper guide groove 14 is the same as the sum of the cross-sectional areas of the confluence upper guide branch grooves 16. The sum of the cross-sectional areas of the upper guide branch grooves 16 equals the cross-sectional area of the upper guide groove 14, ensuring that the linear velocity of the airflow does not change or changes only slightly when it is transmitted between the upper guide branch grooves 16 and the upper guide groove 14, which is more conducive to airflow guidance. Similarly, the lower guide groove 24 has the same function, which will not be described in detail here.
[0061] Furthermore, the two upper guide channels 16 are connected by Y-type connectors, and the two lower guide channels 26 are connected by Y-type connectors.
[0062] In this embodiment, the first top surface 12 and the first bottom surface 13 of the flow guide cover 1 each have 18 upper flow guide channels 16. One end of each upper flow guide channel 16 connects to the flow guide channel 14, and the other end contacts the internal space and material of the vacuum device. The upper flow guide channels 16 use Y-type connectors for convergence, with an intersection angle ranging from 30° to 45°. Figure 5 As shown, for example, two upper guide channels 16 are connected to the outer edge of the guide cover 1. When they converge, the intersection angle formed is θ1, θ1 = 45°. After converging, when they converge again with the third upper guide support 16, the intersection angle formed is θ2, θ2 = 30°. For Y-shaped converging junctions, the mutual interference of multiple gas streams and the combined effects of pipe wall resistance must be considered during converging. According to fluid mechanics conventions, when the intersection angle is between 30-45°, the overall kinetic energy loss (air resistance) is lower. During air extraction, the upper guide channel 16 creates negative pressure, causing gas from all directions inside the device to flow along the channel channel to the upper guide channel 14. A sufficient number of upper guide channels 16 and their cross-distribution on both sides can reduce channel blockage and ensure smooth air extraction when the airflow converges. Similarly, the lower guide channel 26 uses a Y-shaped connector for converging, with an intersection angle of 30°-45°, which also has the same effect.
[0063] Furthermore, one end of the upper guide column 15 is fixed to the first bottom surface 13 of the guide cover plate 1, and the other end is conical, the length of which can be adjusted according to the thickness of the vacuum device. The purpose of setting it to a conical shape is to facilitate the guide cover plate 1 and the guide bottom plate 2 to penetrate into the core material, thereby reducing the compression of the core material and preventing poor contact between the core material and the upper guide column 15 and the lower guide column 25, and the compression of the airflow channel, which would cause the fluid flow to be obstructed.
[0064] The upper flow guide column 15 can be inserted into the filling core material inside the vacuum device, which realizes the fixing of the flow guide cover plate 1 and forms a capillary channel between the upper flow guide column 15 and the core material inside, so that the airflow between the flow guide cover plate 1 and the flow guide bottom plate 2 is smooth. The end of the lower flow guide column 25 is conical, which also has the same effect, and on the one hand, it realizes the fixing of the flow guide bottom plate 2, and on the other hand, it forms a capillary channel between the lower flow guide column 25 and the core material inside, so that the airflow between the flow guide cover plate 1 and the flow guide bottom plate 2 is smooth.
[0065] Since the first bottom surface 13 of the flow guide cover plate 1 is arranged opposite to the second top surface 22 of the flow guide bottom plate 2, the upper flow guide column 15 and the lower flow guide column 25 are distributed in a staggered manner, and in a normal case, the conical design of the upper flow guide column 15 and the lower flow guide column 25 can shorten the distance between the first bottom surface 13 and the second top surface 22, and make the airflow more convenient to connect.
[0066] Further, the area of the flow guide cover plate 1 is greater than the area of the flow guide bottom plate 2, and since the flow guide bottom plate 2 is not a suction port, it is only auxiliary, and in theory, the flow guide cover plate 1 and the flow guide bottom plate 2 should be large enough, but in order to ensure the flatness of each surface, the flow guide cover plate 1 and the flow guide bottom plate 2 should also be small enough. According to the importance of the flow guide cover plate 1 and the flow guide bottom plate 2, the areas of each are appropriately adjusted. Obviously, the flow guide cover plate 1 is close to the suction port, and its role is greater than that of the flow guide bottom plate 2, so the area of the flow guide cover plate 1 is greater than that of the flow guide bottom plate 2.
[0067] Preferably, the diameter of the flow guide bottom plate 2 is one-third to one-half of the diameter of the flow guide cover plate 1. The size can be adjusted according to the size of the vacuum device.
[0068] In an embodiment of the present application, a plurality of upper flow guide grooves 14 are arranged on the first top surface 12 of the flow guide cover plate 1, or a plurality of lower flow guide grooves 24 are arranged on the second bottom surface 23 of the flow guide bottom plate 2.
[0069] This structure is suitable for the case that the cladding material of the vacuum device is a rigid material, which avoids the influence of soft material on the upper flow guide groove 14 or the lower flow guide groove 24.
[0070] As shown in Figure 11 , Figure 12 and Figure 13 In another embodiment of the present application, the upper flow guide groove 14 is arranged on the first bottom surface 13 of the flow guide cover plate 1, and when there is no upper flow guide groove 14 on the first top surface 12, a plurality of first through holes 17 are arranged on the first bottom surface 13 of the flow guide cover plate 1, the first through hole 17 is located at the intersection of the upper flow guide groove 14 and the upper flow guide branch groove 16, and the first through hole 17 penetrates to the first top surface 11.
[0071] A plurality of second through holes 27 are arranged on the second top surface 22 of the flow guide bottom plate 2, and the second through holes 27 are arranged at the intersection of the lower flow guide groove 24 and the lower flow guide branch groove 26, and the second through holes 27 penetrate the second bottom surface 23.
[0072] The structure is suitable for the soft material as the cladding material of the vacuum device, and can avoid deformation of the soft material after pumping.
[0073] As shown in Figure 6 , Figure 7 and Figure 8 , a vacuum insulation board comprises a core material 3, a flow guide device and a cladding material (not shown in the figure for better illustration), the cladding material wraps the core material 3 and forms a vacuum between the core material 3 and the cladding material, and the flow guide device is installed on the core material 3. Figure 9 and Figure 10 , the core material 3 has an upper surface and a lower surface arranged opposite to the upper surface, the upper surface of the core material 3 is provided with a first recess 31, the flow guide cover plate 1 is installed in the first recess 31, the lower surface of the core material 3 is provided with a second recess 32, the flow guide bottom plate 2 is installed in the second recess 32, so that the first bottom surface 13 of the flow guide cover plate 1 is arranged opposite to the second top surface 22 of the flow guide bottom plate 2, and the upper flow guide column 15 and the lower flow guide column 25 are staggered. Figure 8 For example, as shown in
[0074] The utility model also provides a kind of box, using above-mentioned vacuum insulation board.It is specific that, including core material (or support structure), flow guide device, cladding material, cladding material wraps the core material (or support structure), shape can be according to product customization special-shaped structure, and vacuum is formed between the core material (or support structure);Flow guide device is installed on the core material (or support structure), and flow guide device is described above.Core material, flow guide device and cladding material are located in box body, and box body material is one or more of metal, nonmetal.
[0075] The utility model also provides a kind of refrigerator, using one or more of above-mentioned vacuum insulation board, vacuum insulation box.It is specific that, vacuum insulation board and (or) vacuum insulation box constitute the box of refrigerator, door body, and form refrigerator by assembling.
[0076] Further, the center of the converging air extraction hole 11 and the center of the converging air guide hole 21 are on the same straight line. In the air extraction process, the shorter the travel distance of the gas flow, the smaller the air resistance. The center of the converging air extraction hole 11 and the center of the converging air guide hole 21 are on the same straight line, so that the travel distance is the shortest and the air extraction efficiency is the highest.
[0077] Further, from the top view, the shape of the air guide cover plate 1 and the air guide bottom plate 2 is one of circular, square, oval, triangular.
[0078] When the utility model is used, the air guide cover plate 1 is installed on the upper surface of the core material 3 of the vacuum device in advance, the air guide bottom plate 1 is placed on the lower surface of the core material, and the two are kept centered. The first top surface 22 of the air guide cover plate 1 is closely combined with the inner wall of the shell of the vacuum device, the first bottom surface 23 of the air guide cover plate 1 is closely combined with the outer surface of the core material 3, the second top surface 22 of the air guide bottom plate 2 is closely combined with the outer surface of the core material 3, and the second bottom surface 24 of the air guide bottom plate 2 is closely combined with the inner wall of the shell in another direction of the vacuum device. Ensure that the air extraction hole is aligned with the converging air extraction hole 11 of the air guide cover plate 1 and keeps the two in communication. The gas between the inner wall of the vacuum device and the core material 3 can flow to the converging air extraction hole 11 through the upper air guide branch groove 16, the lower air guide branch groove 26, the upper air guide groove 14 and the lower air guide groove 24 of the air guide cover plate 1 and the air guide bottom plate 2, and the gas inside the core material 3 flows to the converging air extraction hole through the upper air guide branch groove 16, the lower air guide branch groove 26, the upper air guide groove 14, the lower air guide groove 24, the upper air guide column 15 and the lower air guide column 25, and is finally extracted from the vacuum device. After the air extraction is completed, the air extraction hole is sealed, so that the surface of the vacuum device is kept flat while the expected vacuum degree is reached.
[0079] The above is only a preferred embodiment of the utility model, and does not limit the technical scope of the utility model, so any changes or modifications made according to the claims and description of the utility model shall be within the scope of the utility model patent.
Claims
1. A flow directing device, characterized by: The device comprises a flow guide cover plate and a flow guide bottom plate. The center of the flow guide cover plate is provided with a flow guide hole, and the center of the flow guide bottom plate is provided with a flow guide hole. The flow guide cover plate has a first top surface and a first bottom surface opposite to the first top surface. A plurality of upper flow guide grooves are arranged on the first bottom surface and connected with the flow guide hole. A plurality of upper flow guide columns are arranged on the first bottom surface of the flow guide cover plate and are distributed staggeredly with the upper flow guide grooves. The flow guide bottom plate has a second top surface and a second bottom surface opposite to the second top surface. A plurality of lower flow guide grooves are arranged on the second top surface and connected with the flow guide hole. A plurality of lower flow guide columns are arranged on the second top surface of the flow guide bottom plate and are distributed staggeredly with the lower flow guide grooves. The first bottom surface of the flow guide cover plate is arranged opposite to the second top surface of the flow guide bottom plate, and the upper flow guide columns and the lower flow guide columns are distributed staggeredly.
2. The flow directing device of claim 1, wherein: The upper flow guide columns are distributed in two circles around the flow guide hole, which are an inner circle of upper columns and an outer circle of upper columns. The lower flow guide columns are distributed in one circle around the flow guide hole and are located in the annulus formed by the inner circle of upper columns and the outer circle of upper columns.
3. The flow directing device of claim 1, wherein: A plurality of upper flow guide grooves are arranged on the first top surface. The flow guide hole is composed of a plurality of groups of holes. Along the diameter direction, from the inside to the outside, three circles of up-and-down through holes are arranged, which are an inner circle of upper holes, a middle circle of upper holes and an outer circle of upper holes. One side edge of the outer circle of upper holes is connected with one upper flow guide groove of the first top surface, and the other side edge of the outer circle of upper holes is connected with one upper flow guide groove of the first bottom surface.
4. The flow directing device of claim 1, wherein: A plurality of lower flow guide grooves are arranged on the second bottom surface. The flow guide hole is composed of a plurality of groups of holes. Along the diameter direction, from the inside to the outside, three circles of up-and-down through holes are arranged, which are an inner circle of lower holes, a middle circle of lower holes and an outer circle of lower holes. One side edge of the outer circle of lower holes is connected with one lower flow guide groove of the second top surface, and the other side edge of the outer circle of lower holes is connected with one lower flow guide groove of the second bottom surface.
5. The flow directing device of claim 1, wherein: A plurality of upper flow guide branch grooves and a plurality of lower flow guide branch grooves are further included. Each upper flow guide groove is connected with at least one upper flow guide branch groove, and each lower flow guide groove is connected with at least one lower flow guide branch groove.
6. The flow directing device of claim 5, wherein: The upper flow guide branch grooves adopt Y-shaped joints for flow confluence, and the lower flow guide branch grooves adopt Y-shaped joints for flow confluence.
7. The flow directing device of claim 5, wherein: The cross-sectional area of each upper flow guide groove is equal to the sum of the cross-sectional areas of the upper flow guide branch grooves connected therewith, and the cross-sectional area of each lower flow guide groove is equal to the sum of the cross-sectional areas of the lower flow guide branch grooves connected therewith.
8. The flow directing device of claim 1, wherein: A plurality of upper flow guide grooves are arranged on the first top surface of the flow guide cover plate, and the upper flow guide grooves of the first top surface are connected with the flow guide hole, or a plurality of lower flow guide grooves are arranged on the second bottom surface of the flow guide bottom plate, and the lower flow guide grooves of the second bottom surface are connected with the flow guide hole.
9. The flow directing device of claim 5, wherein: A plurality of first through holes penetrating to the first top surface are arranged at the intersection of the upper flow guide grooves and the upper flow guide branch grooves on the first bottom surface of the flow guide cover plate, and a plurality of second through holes penetrating to the second bottom surface are arranged at the intersection of the lower flow guide grooves and the lower flow guide branch grooves on the second top surface of the flow guide bottom plate.
10. Use of a flow directing device according to any one of claims 1-9, characterized in that: The device is applied to a vacuum heat insulation plate. The vacuum heat insulation plate comprises a core material, a flow guide device and a cladding material. The cladding material wraps the core material and forms a vacuum between the core material and the cladding material. The flow guide device is installed on the core material.