Manufacturing method of refrigerator door body

Abstract

The invention discloses a manufacturing method of a refrigerator door body. The manufacturing method comprises the following steps that S1, a powdery thermal insulation material is put into a breathable powder-impermeable bag to form a core material; s2, the core material is placed in the groove of the inner container, and then the core material is compressed; s3, the shell and the inner container are in butt joint together, and the core material is located between the shell and the inner container; s4, the heat sealing layer is heated, so that the first heat sealing layer and the second heat sealing layer are heat-sealed together; s5, vacuumizing the core material through the extraction opening by using a vacuumizing device; and S6, after vacuumizing is completed, a barrier film is bonded to the extraction opening for sealing. The inner container and the shell are used as obstructing pieces, the core material is placed in the inner container and the shell and then vacuumized, and the manufacturing process is simple.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerator door bodies, and in particular to a method for manufacturing a refrigerator door body. Background Art

[0002] A refrigerator is a refrigeration device that keeps a constant low temperature, and is also a civilian product that keeps food or other items in a constant low temperature cold state. Usually, a refrigerator has a freezer compartment for freezing and storing food or other items and a refrigerator compartment for storing food or other items in a low temperature environment.

[0003] The refrigerator has a refrigerator door body. In order to improve the heat insulation performance of the refrigerator door body, some refrigerator doors are provided with vacuum insulation panels. The traditional method of making a refrigerator door body is as follows: according to the shapes of the inner liner and the outer shell, a special-shaped vacuum insulation panel matching the inner liner and the outer shell is made, and then the special-shaped vacuum insulation panel is placed in the outer shell, and finally the inner liner is installed on the outer shell, thereby completing the installation of the refrigerator door body.

[0004] The traditional method of manufacturing a refrigerator door requires manufacturing a special-shaped vacuum insulation panel according to the shape of the inner liner and the outer shell. When manufacturing the special-shaped vacuum insulation panel, core materials of different sizes are stacked together and placed in a barrier bag according to the shape of the inner liner and the outer shell, and then vacuumed and sealed, and finally folded to complete the manufacturing of the special-shaped vacuum insulation panel. The manufacturing process of the special-shaped vacuum insulation panel is cumbersome, and the process of connecting the special-shaped vacuum insulation panel with the outer shell and the inner liner is relatively cumbersome. Summary of the invention

[0005] Based on the above-mentioned problems existing in the prior art, the purpose of the embodiments of the present application is to provide a method for manufacturing a refrigerator door, which uses an inner tank and an outer shell as barriers, places a core material in the inner tank and the outer shell and then performs vacuuming, and the manufacturing process is relatively simple.

[0006] The technical solution adopted by the present application to solve the technical problem is: a method for manufacturing a refrigerator door, comprising the following steps:

[0007] S1, putting powdered thermal insulation material into an air-permeable and powder-impermeable bag to form a core material;

[0008] S2, placing the core material in the groove of the inner liner, and then compressing the core material so that the surface of the core material fits the inner side of the inner liner; wherein an air extraction port is provided on the inner liner, and the inner liner comprises an inner liner body, a first barrier layer and a first heat sealing layer, one side of the first barrier layer is connected to the inner liner body, and the other side of the first barrier layer is connected to the first heat sealing layer;

[0009] S3, butting the outer shell and the inner liner together so that the core material is located between the outer shell and the inner liner; wherein the outer shell includes an outer shell body, a second barrier layer and a second heat-sealing layer, one side of the second barrier layer is connected to the outer shell body, and the other side of the second barrier layer is connected to the second heat-sealing layer, and after the outer shell and the inner liner are butted together, the second heat-sealing layer and the first heat-sealing layer are butted together;

[0010] S4, heating the heat sealing layer to heat-seal the first heat sealing layer and the second heat sealing layer together;

[0011] S5, using a vacuum device to vacuum the core material through the vacuum port;

[0012] S6, after the vacuum is drawn, the barrier film is bonded to the vacuum port for sealing.

[0013] Furthermore, the powdered thermal insulation material is one or more of expanded perlite, fumed silica, precipitated silica, and microsilica powder.

[0014] Furthermore, the first barrier layer is an aluminum foil layer, and the first heat sealing layer is a PE layer.

[0015] Furthermore, the second barrier layer is an aluminum foil layer, and the second heat sealing layer is a PE layer.

[0016] Furthermore, before the core material is placed in the inner container, one side of the auxiliary air extraction workpiece is placed on the core material, and the other side of the auxiliary air extraction workpiece is located at the air extraction port.

[0017] Furthermore, the auxiliary exhaust workpiece includes a workpiece body, one side of the workpiece body is recessed inward to form an exhaust flow channel, and the other side of the workpiece body forms a flat surface. An exhaust hole is arranged on the workpiece body, the input end of the exhaust hole is connected to the exhaust flow channel, and the output end of the exhaust hole is located on the flat surface.

[0018] Furthermore, the air extraction channel includes a straight flow channel and an annular flow channel, one end of the straight flow channel forms a first input port, the other end of the straight flow channel forms a second input port, the middle of the straight flow channel forms a first side flow groove, the annular flow channel is cross-arranged with the straight flow channel, the annular flow channel forms a second side flow groove, and the second side flow groove is connected to the first side flow groove.

[0019] Furthermore, a plurality of straight flow channels are provided, and the straight lines where the plurality of straight flow channels are located intersect at one point.

[0020] Furthermore, the annular flow channels are provided in a plurality, the plurality of annular flow channels are arranged concentrically, and the inner diameter of each annular flow channel is inconsistent.

[0021] Furthermore, four straight flow channels are provided, and three annular flow channels are provided; the center position of the annular flow channel is the same position as the intersection position of the straight lines where the three straight flow channels are located.

[0022] Furthermore, three straight flow channels are provided, and three annular flow channels are provided; the center position of the annular flow channel is the same position as the intersection position of the straight lines where the three straight flow channels are located.

[0023] Furthermore, the annular flow channel is composed of an annular inner flow channel, an annular middle flow channel and an annular outer flow channel from inside to outside, a first exhaust hole is arranged between the annular inner flow channel and the center position of the workpiece body, and a second exhaust hole is arranged between the annular middle flow channel and the annular inner flow channel.

[0024] Furthermore, the flat surface of the workpiece body is circular.

[0025] Furthermore, a vertical limiting plate is formed in the inner liner and is in contact with the side of the core material.

[0026] Furthermore, after the core material is placed in the groove of the inner container and compressed, the top plate is pressed against the bottom of the core material.

[0027] Furthermore, the top plate is a polyurethane foam plate.

[0028] Furthermore, a first connecting structure is arranged on the inner liner, and the first connecting structure includes a lower connecting section, an inclined connecting section and an upper connecting section. The lower connecting section is arranged on the side of the vertical limiting plate, one side of the inclined connecting section is connected to the lower connecting section, and the upper connecting section is connected to the other side of the inclined connecting section; a second connecting structure is arranged on the outer shell, and the second connecting structure includes a first connecting surface, an inclined connecting surface and a second connecting surface. The first connecting surface is arranged opposite to the lower connecting section, the inclined connecting surface is arranged opposite to the inclined connecting section, and the second connecting surface is arranged opposite to the upper connecting section.

[0029] Furthermore, the lower connecting section is a lower horizontal connecting section, and the angle formed by the lower horizontal connecting section and the inclined connecting section is greater than ninety degrees and less than one hundred and eighty degrees; the inclined connecting section, the lower horizontal connecting section and the vertical limiting plate together form a lower pressure groove.

[0030] Furthermore, after the outer shell and the inner shell are docked together, the lower pressure plate presses the first connecting structure onto the second connecting structure, and a heating ring is arranged on the lower pressure plate. The heating ring includes a first heating surface, a second heating surface and a third heating surface. The first heating surface abuts against the lower connecting section, the second heating surface abuts against the inclined connecting section, and the third heating surface abuts against the upper connecting section.

[0031] Furthermore, the upper connecting section is an upper horizontal connecting section.

[0032] Furthermore, a getter and a desiccant are arranged in the air-permeable and powder-impermeable bag.

[0033] Furthermore, a mounting groove is formed at the upper end of the air exhaust port, and a positioning step is formed in the mounting groove; and a mounting plate is also included, the mounting plate is arranged in the mounting groove, and a barrier film is arranged on the mounting plate.

[0034] Furthermore, it also includes an upper support plate, on which an annular heating block is arranged, and the annular heating block is tightly attached to the outer surface of the second connecting structure. A receiving groove is formed on the outer side of the second connecting structure to facilitate the annular heating block to fit into the second connecting structure. After the second connecting structure is connected to the first connecting structure, the annular heating block is separated from the receiving groove, and then the annular frame is arranged in the receiving groove, thereby completing the production of the refrigerator door body.

[0035] Furthermore, the vacuum extraction device includes a cover body, an exhaust pipe and a pressing mechanism. The cover body is arranged on the inner tank, and an exhaust cavity is formed in the cover body. One end of the exhaust pipe is connected to the exhaust cavity, and the other end of the exhaust pipe is connected to the exhaust device. The pressing mechanism is arranged on the cover body. The pressing mechanism includes a pressing rod, a bellows and a pressing plate. The pressing rod can be raised and lowered on the cover body. The lower end of the pressing rod is located in the exhaust cavity. One end of the bellows is arranged on the cover body, and the other end of the bellows is arranged on the pressing rod. The pressing plate is arranged at the end of the pressing rod, and the pressing plate is bonded to the mounting plate.

[0036] Furthermore, a lifting plate is arranged on the cover body, one side of the lifting plate forms a first lifting portion, and the other side of the lifting plate forms a second lifting portion.

[0037] Furthermore, a sealing ring is formed at the end of the cover body.

[0038] The beneficial effects of the present application are as follows: since the inner liner includes an inner liner body, a first barrier layer and a first heat-sealing layer, and the outer shell includes an outer shell body, a second barrier layer and a second heat-sealing layer, the inner liner and the outer shell both have a barrier effect, and the inner liner and the outer shell are used as barrier parts. After the core material is placed between the inner liner and the outer shell, the periphery of the inner liner and the periphery of the outer shell are heat-sealed together, the core material is vacuumed through the air extraction port, and finally the air extraction port is sealed with a barrier film, thereby completing the production of the refrigerator door body, and the production process is relatively simple. At the same time, since the core material is made of powdered thermal insulation material and an air-permeable and non-powder-permeable bag, the core material is placed in the groove of the inner liner, and after the core material is compressed and squeezed, the surface of the core material is easy to fit with the inner side of the inner liner, thereby improving the heat insulation effect of the refrigerator door body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the refrigerator door in this application;

[0040] Figure 2 is a cross-sectional view of a refrigerator door in this application;

[0041] Figure 3 This is a schematic diagram of the connection between the inner liner, the outer shell and the core material in this application;

[0042] Figure 4 This is a schematic diagram of the structure of another refrigerator door in this application;

[0043] Figure 5 This is a schematic diagram of the structure of the auxiliary exhaust workpiece in this application;

[0044] Figure 6 This is a schematic diagram of the structure of the auxiliary vacuum workpiece from another angle in this application;

[0045] Figure 7 This is a schematic diagram of the connection between the vacuum device and the inner tank in this application;

[0046] Figure 8 This is a schematic diagram of the connection between the vacuum pumping device and the inner container in another embodiment of the present application.

[0047] Description of Reference Numerals

[0048] Core material 1, powdery thermal insulation material 11, air-permeable and impermeable powder bag 12, liner 2, groove 21, air extraction port 22, mounting groove 221, positioning step 222, liner body 23, first barrier layer 24, first heat sealing layer 25, vertical limit plate 26, first connecting structure 27, lower connecting section 271, inclined connecting section 272, upper connecting section 273, lower pressing groove 28, mounting plate 29, barrier film 210, protrusion 211, positioning groove 2111, top plate 3, shell 4, shell body 41, second barrier layer 42, second heat sealing layer 43, second connecting structure 44, first connecting surface 441, inclined The inclined connecting surface 442, the second connecting surface 443, the auxiliary exhaust workpiece 5, the exhaust flow channel 51, the straight flow channel 511, the first input port 5111, the second input port 5112, the first side flow groove 5113, the annular flow channel 512, the second side flow groove 5121, the annular inner flow channel 5122, the annular middle flow channel 5123, the annular outer flow channel 5124, the flat surface 52, the exhaust hole 53, the first exhaust hole 531, the second exhaust hole 532, the vacuum device 6, the cover body 61, the exhaust pipe 62, the pressing mechanism 63, the pressing rod 631, the bellows 632, the pressing plate 633, and the frame body 7. DETAILED DESCRIPTION

[0049] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0050] like Figures 1 to 8 As shown, a method for manufacturing a refrigerator door of the present invention comprises the following steps:

[0051] S1, put the powdered thermal insulation material 11 into the air-permeable and impermeable powder bag 12 to form the core material 1; S2, place the core material 1 in the groove 21 of the inner liner 2, and then compress the core material 1 so that the surface of the core material 1 fits with the inner side of the inner liner 2; wherein, the inner liner 2 is provided with an air extraction port 22, and the inner liner 2 includes an inner liner body 23, a first barrier layer 24 and a first heat-sealing layer 25, one side of the first barrier layer 24 is connected to the inner liner body 23, and the other side of the first barrier layer 24 is connected to the first heat-sealing layer 25; S3, dock the outer shell 4 with the inner liner 2, so that the core material 1 is located between the outer shell 4 and the inner liner 2; wherein, the outer shell 4 comprises an outer shell 41, a second barrier layer 42 and a second heat-sealing layer 43, one side of the second barrier layer 42 is connected to the outer shell 41, and the other side of the second barrier layer 42 is connected to the second heat-sealing layer 43. After the outer shell 4 and the inner liner 2 are butted together, the second heat-sealing layer 43 and the first heat-sealing layer 25 are butted together; S4, heating the heat-sealing layer to heat-seal the first heat-sealing layer 25 and the second heat-sealing layer 43 together; S5, using the vacuum device 6 to vacuumize the core material 1 through the exhaust port 22; S6, after vacuuming, bonding the barrier film 210 to the exhaust port 22 for sealing.

[0052] Thus, the present invention relates to a method for manufacturing a refrigerator door body. Since the inner liner 2 includes an inner liner body 23, a first barrier layer 24 and a first heat-sealing layer 25, and the outer shell 4 includes an outer shell body 41, a second barrier layer 42 and a second heat-sealing layer 43, the inner liner 2 and the outer shell 4 both have a barrier effect, and the inner liner 2 and the outer shell 4 are used as barrier parts. After the core material 1 is placed between the inner liner 2 and the outer shell 4, the periphery of the inner liner 2 and the periphery of the outer shell 4 are heat-sealed together, the core material 1 is vacuumed through the air extraction port 22, and finally the air extraction port 22 is sealed with a barrier film 210, thereby completing the manufacturing of the refrigerator door body, and the manufacturing process is relatively simple. At the same time, since the core material 1 is made of a powdery heat-insulating material 11 and an air-permeable and non-powder-permeable bag 12, the core material 1 is placed in the groove 21 of the inner liner 2, and after the core material 1 is compressed and squeezed, the surface of the core material 1 is easy to fit with the inner side of the inner liner 2, thereby improving the heat insulation effect of the refrigerator door body.

[0053] Optionally, the powdered thermal insulation material 11 is one or more of expanded perlite, fumed silica, precipitated silica, and microsilica powder. For example, if the powdered thermal insulation material 11 is expanded perlite, after the expanded perlite is loaded into an air-permeable and powder-impermeable bag 12 to form a core material 1, due to the characteristics of the powdered thermal insulation material 11, after the core material 1 is placed in the inner liner 2 and compressed, the surface of the core material 1 will fit tightly together with the inner side of the inner liner 2, effectively reducing the gap formed between the core material 1 and the inner liner 2, thereby improving the thermal insulation effect of the refrigerator door.

[0054] In this embodiment, the first barrier layer 24 is an aluminum foil layer, the first heat-sealing layer 25 is a PE layer, the second barrier layer 42 is an aluminum foil layer, and the second heat-sealing layer 43 is a PE layer. The aluminum foil layer has good air and water barrier properties. After the refrigerator door body is made, it is difficult for external moisture to enter the refrigerator door body. The PE layer has a good heat-sealing effect. After the first heat-sealing layer 25 and the second heat-sealing layer 43 are heated, the periphery of the inner liner 2 and the periphery of the outer shell 4 are sealed and connected together. Among them, the inner liner body 23 and the outer shell 41 are made of high-temperature resistant materials, or made of metal materials, so as to prevent the inner liner 2 or the outer shell 4 from deforming during heating and heat sealing.

[0055] In order to improve the air extraction efficiency, before the core material 1 is placed in the inner liner 2, one side of the auxiliary air extraction workpiece 5 is placed on the core material 1, and the other side of the auxiliary air extraction workpiece 5 is located at the position of the air extraction port 22. The auxiliary air extraction workpiece 5 includes a workpiece body, one side of the workpiece body is recessed inward to form an air extraction channel 51, and the other side of the workpiece body forms a flat surface 52. The workpiece body is provided with an air extraction hole 53, the input end of the air extraction hole 53 is connected to the air extraction channel 51, and the output end of the air extraction hole 53 is located on the flat surface 52.

[0056] When in use, the auxiliary air extraction workpiece 5 can be placed on the core material 1 so that the side with the air extraction channel 51 is against the core material 1, and then the core material 1 is placed on the inner liner 2 so that the auxiliary air extraction workpiece 5 is facing the air extraction port 22. When the vacuum device 6 is used for vacuum extraction, the gas in the core material 1 will flow through the air extraction channel 51 and the air extraction hole 53, so that the gas in the core material 1 can be quickly extracted, and the air extraction speed is fast. By setting the flat surface 52, the flat surface 52 can fit the inner wall of the inner liner 2, so that the surface of the inner liner 2 is flat.

[0057] Further, the exhaust channel 51 includes a straight channel 511 and an annular channel 512, one end of the straight channel 511 forms a first input port 5111, the other end of the straight channel 511 forms a second input port 5112, a first side flow groove 5113 is formed in the middle of the straight channel 511, the annular channel 512 is arranged crosswise with the straight channel 511, the annular channel 512 forms a second side flow groove 5121, and the second side flow groove 5121 is connected to the first side flow groove 5113. By setting the straight channel 511, when exhausting, a part of the gas in the core material 1 is output from the exhaust hole 53 along the first input port 5111 through the first side flow groove 5113, another part of the gas in the core material 1 is output from the exhaust hole 53 along the second input port 5112 through the first side flow groove 5113, and another part of the gas in the core material 1 is directly output from the exhaust hole 53 through the first side flow groove 5113, so that the gas in the core material 1 is quickly exhausted. Since the annular flow channel 512 and the straight flow channel 511 are cross-arranged, even if part of the straight flow channel 511 is blocked by the core material 1 and affects the gas flow, the gas can also flow from the adjacent annular flow channel 512, and the exhaust effect is good. At the same time, the gas in the core material 1 can also be directly output from the exhaust hole 53 through the second side flow groove 5121.

[0058] like Figure 5 As shown, preferably, the straight flow channel 511 is set to be multiple, and the straight lines where the multiple straight flow channels 511 are located intersect at one point. The annular flow channel 512 is set to be multiple, and the multiple annular flow channels 512 are concentrically arranged, and the inner diameters of each annular flow channel 512 are inconsistent. By setting multiple straight flow channels 511 and multiple annular flow channels 512, the flow paths of the gas are increased, and the air extraction efficiency is high. Among them, the straight flow channels 511 are set to four, and the annular flow channels 512 are set to three; the center position of the annular flow channel 512 is the same position as the intersection position of the straight lines where the three straight flow channels 511 are located. Of course, the straight flow channels 511 can also be set to three, and the annular flow channels 512 can be set to three; the center position of the annular flow channel 512 is the same position as the intersection position of the straight lines where the three straight flow channels 511 are located.

[0059] In this embodiment, the annular flow channel 512 is composed of an annular inner flow channel 5122, an annular middle flow channel 5123 and an annular outer flow channel 5124 from the inside to the outside. A first air extraction hole 531 is arranged between the annular inner flow channel 5122 and the center of the workpiece body, and a second air extraction hole 532 is arranged between the annular middle flow channel 5123 and the annular inner flow channel 5122. The first air extraction hole 531 is arranged in a plurality, such as six, and the second air extraction hole 532 is also arranged in a plurality, such as six. By arranging a plurality of first air extraction holes 531 and second air extraction holes 532, gas can be extracted from the first air extraction hole 531 or the second air extraction hole 532, and the air extraction efficiency is high.

[0060] Furthermore, the flat surface 52 of the workpiece body is circular. Of course, the flat surface 52 of the workpiece body can also be other shapes, such as oval, rectangular or square.

[0061] In a preferred embodiment of the present invention, a vertical limiting plate 26 is formed in the inner liner 2 and is in contact with the side of the core material 1. Four vertical limiting plates 26 are provided, and grooves 21 are formed in the four vertical limiting plates 26, so as to limit the core material 1 and facilitate compression of the core material 1.

[0062] In this embodiment, Figure 4 As shown, after the core material 1 is placed in the groove 21 of the inner liner 2 and the core material 1 is compressed, the top plate 3 is placed on the bottom of the core material 1. The top plate 3 is a polyurethane foam board or a vacuum insulation board, wherein the polyurethane foam board has a certain elasticity, so that after the refrigerator door body is made, the polyurethane foam board tightly presses the core material 1 on the inner liner 2, and the core material 1 does not shake. At the same time, the polyurethane foam board is light in weight, so that the weight of the refrigerator door body is light.

[0063] In a preferred embodiment of the present invention, Figure 3 As shown, a first connecting structure 27 is arranged on the inner liner 2, and the first connecting structure 27 includes a lower connecting section 271, an inclined connecting section 272 and an upper connecting section 273. The lower connecting section 271 is arranged on the side of the vertical limiting plate 26, one side of the inclined connecting section 272 is connected to the lower connecting section 271, and the upper connecting section 273 is connected to the other side of the inclined connecting section 272; a second connecting structure 44 is arranged on the outer shell 4, and the second connecting structure 44 includes a first connecting surface 441, an inclined connecting surface 442 and a second connecting surface 443. The first connecting surface 441 is arranged opposite to the lower connecting section 271, the inclined connecting surface 442 is arranged opposite to the inclined connecting section 272, and the second connecting surface 443 is arranged opposite to the upper connecting section 273.

[0064] When the inner liner 2 is connected to the outer shell 4, the outer shell 4 is placed on the inner liner 2. After pressing the outer shell 4, the first connecting surface 441 abuts against the lower connecting section 271, the inclined connecting surface 442 abuts against the inclined connecting section 272, and the second connecting surface 443 abuts against the upper connecting section 273. Then, the first heat sealing layer 25 and the second heat sealing layer 43 are heated to achieve a sealed connection between the outer shell 4 and the inner liner 2, and the sealing of the connecting position is good.

[0065] In this embodiment, the outer surface of the housing 4 is convex to form an arc-shaped convex portion, so that when the vacuum device 6 is used for vacuuming, the housing is not easily deformed.

[0066] Furthermore, the lower connecting section 271 is a lower horizontal connecting section, and the angle formed by the lower horizontal connecting section and the inclined connecting section 272 is greater than ninety degrees and less than one hundred and eighty degrees; the inclined connecting section 272, the lower horizontal connecting section and the vertical limiting plate 26 together form a lower pressing groove 28. Since the angle formed by the lower horizontal connecting section and the inclined connecting section 272 is greater than ninety degrees and less than one hundred and eighty degrees, the heat sealing area between the inner liner 2 and the outer shell 4 is increased, and the heat sealing effect is improved. At the same time, by setting the lower pressing groove 28, the notch of the lower pressing groove 28 is gradually expanded, so that it is convenient to insert the heating ring on the lower pressing plate into the lower pressing groove 28, so as to achieve rapid heating of the first heat sealing layer 25 and the second heat sealing layer 43.

[0067] In a preferred embodiment of the present invention, after the outer shell 4 and the inner shell 2 are docked together, the lower pressure plate is pressed downward to press the first connecting structure 27 onto the second connecting structure 44, and a heating ring is arranged on the lower pressure plate. The heating ring includes a first heating surface, a second heating surface and a third heating surface. The first heating surface abuts against the lower connecting section 271, the second heating surface abuts against the inclined connecting section 272, and the third heating surface abuts against the upper connecting section 273.

[0068] By setting the lower pressing plate, it is convenient to fix the heating ring on the lower pressing plate. After the lower pressing plate is pressed down, the first connecting structure 27 and the second connecting structure 44 are tightly fitted together, so that after heating, the inner liner 2 and the outer shell 4 are firmly heat-sealed together. By setting the first heating surface, the second heating surface and the third heating surface, the PE layer is heated evenly during heating, and the heat sealing effect is good.

[0069] The upper connecting section 273 is an upper horizontal connecting section, and the lower connecting section 271 is a lower horizontal connecting section. A getter and a desiccant are arranged in the air-permeable and powder-impermeable bag 12. By arranging the getter and the desiccant, residual gas is absorbed, thereby improving the heat insulation effect of the refrigerator door.

[0070] In this embodiment, an upper abutment plate is further included, on which an annular heating block is arranged, and the annular heating block is closely attached to the outer surface of the second connecting structure 44, so as to heat the second heat sealing layer 43. The second heat sealing layer 43 and the first heat sealing layer 25 are heated at the same time to achieve the second heat sealing layer 43 and the first heat sealing layer 25 being firmly heat-sealed together.

[0071] The second connection structure 44 is provided with a receiving groove on the outside thereof, which is convenient for the annular heating block to be attached to the second connection structure 44. After the second connection structure 44 is connected to the first connection structure 27, the annular heating block is separated from the receiving groove, and then the annular frame 7 is arranged in the receiving groove, thereby completing the manufacture of the refrigerator door. The material of the annular frame 7 is preferably a light material, so that the manufactured refrigerator door is light in weight.

[0072] like Figure 7As shown, in this embodiment, a mounting groove 221 is formed at the upper end of the air extraction port 22, and a positioning step 222 is formed in the mounting groove 221; a mounting plate 29 is also included, the mounting plate 29 is arranged in the mounting groove 221, and a barrier film 210 is arranged on the mounting plate 29. By setting the positioning step 222 and the mounting groove 221, after the vacuum is exhausted, the mounting plate 29 is pressed on the mounting groove 221, so that the barrier film 210 is bonded to the positioning step 222, so as to seal the air extraction port 22. The notch of the mounting groove 221 is arranged outward in a trumpet shape to ensure that the mounting plate 29 can be pressed down and installed on the mounting groove 221.

[0073] In a preferred embodiment of the present invention, the vacuum device 6 includes a cover body 61, an exhaust pipe 62 and a pressing mechanism 63. The cover body 61 is covered on the inner tank 2. An exhaust cavity is formed in the cover body 61. One end of the exhaust pipe 62 is connected to the exhaust cavity, and the other end of the exhaust pipe 62 is connected to the exhaust device. The pressing mechanism 63 is arranged on the cover body 61. The pressing mechanism 63 includes a pressing rod 631, a bellows 632 and a pressing plate 633. The pressing rod 631 can be raised and lowered on the cover body 61. The lower end of the pressing rod 631 is located in the exhaust cavity. One end of the bellows 632 is arranged on the cover body 61, and the other end of the bellows 632 is arranged on the pressing rod 631. The bellows 632 is located on the outside of the pressing rod 631. The pressing plate 633 is arranged at the end of the pressing rod 631, and the pressing plate 633 is bonded to the mounting plate 29.

[0074] Before using the vacuum device 6 to vacuum the core material 1 through the air suction port 22, the mounting plate 29 with the barrier film 210 is initially bonded to the pressing plate 633. The barrier film 210 is provided with adhesive. After the vacuum is exhausted, the pressing rod 631 is pressed down, so that the mounting plate 29 is pressed down synchronously. After the mounting plate 29 is pressed down, the mounting plate 29 is pressed on the mounting groove 221, so that the adhesive of the barrier film 210 is firmly bonded to the positioning step 222. The adhesive degree is greater than the adhesive degree between the pressing plate 633 and the mounting plate 29, so that when the pressing rod 631 rises, the adhesive of the barrier film 210 is firmly bonded to the positioning step 222, so that the air suction port 22 is sealed. By providing the bellows 632, the two ends of the bellows 632 are sealedly connected with the pressing rod 631 and the cover body 61, so that when the pressing rod 631 is pressed down, there will be no leakage.

[0075] Furthermore, a lifting plate is provided on the cover body 61, a first lifting portion is formed on one side of the lifting plate, and a second lifting portion is formed on the other side of the lifting plate. By providing the lifting plate, when in use, the first lifting portion and the second lifting portion can be grasped with both hands to facilitate moving the vacuum device 6.

[0076] In order to prevent air leakage between the cover body 61 and the inner liner 2 when air is pumped out, a sealing ring is formed at the end of the cover body 61. In this way, after air is pumped out, the inner liner 2 will be tightly pressed against the sealing ring at the end of the cover body 61, and the sealing performance is good.

[0077] Among them, the cover body 61 is cylindrical. When using the vacuum device 6 to vacuum the core material 1 through the vacuum port 22, auxiliary lines are marked around the vacuum port 22 on the inner liner 2, and then the cover body 61 is placed around the vacuum port 22, so that the pressing rod 631 is just located above the vacuum port 22, so that the mounting plate 29 is pressed down and installed on the mounting groove 221.

[0078] like Figure 8 As shown, in some examples, the inner liner 2 protrudes upward to form a protrusion 211, and a positioning groove 2111 for accommodating the auxiliary vacuum workpiece 5 is formed in the protrusion 211. In this way, when in use, the auxiliary vacuum workpiece 5 can be placed in the positioning groove 2111 to position the auxiliary vacuum workpiece 5, and the shape of the protrusion 211 is cylindrical. Correspondingly, the shape of the cover body 61 is cylindrical, and the inner diameter of the cover body 61 is consistent with the outer diameter of the protrusion 211, so that the vacuum device 6 can be quickly and accurately connected to the inner liner 2, and the pressing rod 631 can be located just above the vacuum port 22.

[0079] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for manufacturing a refrigerator door, characterized in that: The following steps are involved: S1, putting powdered thermal insulation material into an air-permeable and powder-impermeable bag to form a core material; S2, placing the core material in the groove of the inner liner, and then compressing the core material so that the surface of the core material fits the inner side of the inner liner; wherein an air extraction port is provided on the inner liner, and the inner liner comprises an inner liner body, a first barrier layer and a first heat sealing layer, one side of the first barrier layer is connected to the inner liner body, and the other side of the first barrier layer is connected to the first heat sealing layer; S3, butting the outer shell and the inner liner together so that the core material is located between the outer shell and the inner liner; wherein the outer shell includes an outer shell body, a second barrier layer and a second heat-sealing layer, one side of the second barrier layer is connected to the outer shell body, and the other side of the second barrier layer is connected to the second heat-sealing layer, and after the outer shell and the inner liner are butted together, the second heat-sealing layer and the first heat-sealing layer are butted together; S4, heating the heat sealing layer to heat-seal the first heat sealing layer and the second heat sealing layer together; S5, using a vacuum device to vacuum the core material through the vacuum port; S6, after the vacuum is drawn, the barrier film is bonded to the vacuum port for sealing.

2. The method for manufacturing a refrigerator door according to claim 1, characterized in that: The powdered thermal insulation material is one or more of expanded perlite, fumed silica, precipitated silica, and microsilica powder.

3. The method for manufacturing a refrigerator door according to claim 1, characterized in that: The first barrier layer is an aluminum foil layer, and the first heat sealing layer is a PE layer; the second barrier layer is an aluminum foil layer, and the second heat sealing layer is a PE layer.

4. The method for manufacturing a refrigerator door according to claim 1, characterized in that: Before the core material is placed in the inner container, one side of the auxiliary air extraction workpiece is placed on the core material, and the other side of the auxiliary air extraction workpiece is located at the air extraction port.

5. The method for manufacturing a refrigerator door according to claim 4, characterized in that: The auxiliary exhaust workpiece includes a workpiece body, one side of the workpiece body is recessed inward to form an exhaust flow channel, and the other side of the workpiece body forms a flat surface. An exhaust hole is arranged on the workpiece body, the input end of the exhaust hole is connected with the exhaust flow channel, and the output end of the exhaust hole is located on the flat surface; the exhaust flow channel includes a straight flow channel and an annular flow channel, one end of the straight flow channel forms a first input port, the other end of the straight flow channel forms a second input port, a first side flow groove is formed in the middle of the straight flow channel, the annular flow channel is cross-arranged with the straight flow channel, the annular flow channel forms a second side flow groove, and the second side flow groove is connected with the first side flow groove.

6. The method for manufacturing a refrigerator door according to claim 1, characterized in that: A vertical limiting plate is formed in the inner liner and is fitted with the side of the core material.

7. The method for manufacturing a refrigerator door according to claim 6, characterized in that: A first connecting structure is arranged on the inner tank, and the first connecting structure includes a lower connecting section, an inclined connecting section and an upper connecting section. The lower connecting section is arranged on the side of the vertical limiting plate, one side of the inclined connecting section is connected to the lower connecting section, and the upper connecting section is connected to the other side of the inclined connecting section; a second connecting structure is arranged on the outer shell, and the second connecting structure includes a first connecting surface, an inclined connecting surface and a second connecting surface. The first connecting surface is arranged opposite to the lower connecting section, the inclined connecting surface is arranged opposite to the inclined connecting section, and the second connecting surface is arranged opposite to the upper connecting section.

8. The method for manufacturing a refrigerator door according to claim 7, characterized in that: After the outer shell and the inner tank are docked together, the lower pressure plate is pressed downward to press the first connecting structure onto the second connecting structure. A heating ring is arranged on the lower pressure plate, and the heating ring includes a first heating surface, a second heating surface and a third heating surface. The first heating surface abuts on the lower connecting section, the second heating surface abuts on the inclined connecting section, and the third heating surface abuts on the upper connecting section; it also includes an upper support plate, on which an annular heating block is arranged, and the annular heating block is tightly attached to the outer surface of the second connecting structure. A receiving groove is formed on the outer side of the second connecting structure to facilitate the annular heating block to fit into the second connecting structure. After the second connecting structure is connected to the first connecting structure, the annular heating block is separated from the receiving groove, and then the annular frame is arranged in the receiving groove.

9. The method for manufacturing a refrigerator door according to claim 1, characterized in that: An installation groove is formed at the upper end of the air exhaust port, and a positioning step is formed in the installation groove; a mounting plate is also included, the mounting plate is arranged in the installation groove, and a barrier film is arranged on the mounting plate.

10. The method for manufacturing a refrigerator door according to claim 9, characterized in that: The vacuum extraction device includes a cover body, an exhaust pipe and a pressing mechanism. The cover body is arranged on the inner tank. An exhaust cavity is formed in the cover body. One end of the exhaust pipe is connected to the exhaust cavity, and the other end of the exhaust pipe is connected to the exhaust device. The pressing mechanism is arranged on the cover body. The pressing mechanism includes a pressing rod, a bellows and a pressing plate. The pressing rod can be raised and lowered on the cover body. The lower end of the pressing rod is located in the exhaust cavity. One end of the bellows is arranged on the cover body, and the other end of the bellows is arranged on the pressing rod. The pressing plate is arranged at the end of the pressing rod, and the pressing plate is bonded to the mounting plate.

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