Inner liner riveting structure and manufacturing method thereof and steaming and baking machine

Abstract

The present invention relates to the field of household appliance technology, and in particular to an inner liner rivet structure, a manufacturing method thereof, and a steaming and baking machine, wherein the inner liner rivet structure comprises a hole and a rivet nut, the hole penetrating a substrate and an enamel layer of an inner liner of a household appliance, the rivet nut being embedded in the hole, the opening of the rivet nut being turned outward to form a retaining edge, the retaining edge being pressed against the opening peripheral edge of the hole, a gasket being sandwiched between the opening peripheral edge of the hole and the retaining edge, the gasket being sleeved on the rivet nut, and the inner ring wall of the gasket sealingly covering the gap between the rivet nut and the hole, the inner liner rivet structure can prevent the enamel layer from bursting, whitening, and cracking, and has the advantage of good sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an inner liner riveting structure and a manufacturing method thereof, and a steaming and baking machine. Background Art

[0002] At present, the inner pot of household appliances (such as ovens, steamers or steam-bake machines) usually uses riveting to fix the rivet nut. The rivet nut is pulled by the screw on the special rivet gun for pulling the rivet nut, so that the rivet nut is longitudinally compressed, and the thin-walled area at the end is deformed by convexity, and the inner pot sheet is clamped, thereby realizing the riveting process. Then, other components on the outside of the inner pot (such as heating pipes, fans, lampshades, brackets, etc.) are firmly connected to the rivet nut using screws. At present, after the inner pot of the steam-bake machine is enameled, the rivet is tightened at the moment of great impact, resulting in the enamel layer on the surface of the inner pot bursting, whitening, and cracking. The bursting rate of the product is almost 100%, making it difficult to implement the rivet nut in the enameled inner pot. However, compared with the stainless steel inner pot, the enameled inner pot has a good appearance, does not change color after long-term use, and is more hygienic, but the problems caused by the riveted nut have prevented the enameled inner pot from being promoted on a large scale. In addition, the steam generated when the inner tank of the household appliance is in operation can easily leak from the gap between the riveted nut and the porcelain layer of the enamel inner tank, causing rust water to leak around the riveted screws. Summary of the invention

[0003] One of the purposes of the present invention is to avoid the deficiencies in the prior art and provide an inner liner riveting structure, which can prevent the enamel layer from bursting, whitening, and cracking, and has the advantage of good sealing.

[0004] A second object of the present invention is to provide a method for manufacturing an inner liner riveting structure.

[0005] A third object of the present invention is to provide a steaming and baking machine.

[0006] To achieve one of the above purposes, the present invention provides the following technical solutions:

[0007] Provided is an inner liner rivet structure, comprising a hole and a rivet nut, wherein the hole sequentially penetrates a substrate and an enamel layer of an inner liner of a household appliance, the rivet nut is embedded in the hole, an opening of the rivet nut is turned outward to form a retaining edge, the retaining edge is pressed against an opening peripheral edge of the hole, a washer is sandwiched between the opening peripheral edge of the hole and the retaining edge, the washer is sleeved on the rivet nut, and an inner ring wall of the washer seals and covers a gap between the rivet nut and the hole.

[0008] The working principle of the above-mentioned inner liner riveting structure is as follows: the retaining edge of the rivet nut is pressed against the opening circumference of the hole, the retaining edge can strengthen the strength of the opening circumference of the hole, and the resistance force generated by the retaining edge can offset the instantaneous impact force of the rivet being tightened, thereby avoiding problems such as porcelain explosion, whitening, and cracks in the enamel layer; the washer can buffer the extrusion force between the retaining edge and the opening circumference of the hole to avoid deformation of the enamel layer caused by excessive extrusion. In addition, the washer can seal and cover the gap between the rivet nut and the hole, thereby reducing or preventing the steam generated by the household appliance from leaking from the gap, thereby better protecting the inner liner of the household appliance.

[0009] In some embodiments, the surface of the enamel layer protrudes outward to form a boss, and the hole is opened in the middle of the boss.

[0010] In some embodiments, the surface of the enamel layer protrudes outward by 0.7 mm to 1.1 mm to form the boss.

[0011] In some embodiments, the upper surface and the lower surface of the gasket are pressed by the table surface of the boss and the stop edge respectively.

[0012] In some embodiments, the cross section of the boss is an isosceles trapezoid, and the bottom edge of the isosceles trapezoid gradually shortens along a side facing away from the enamel layer.

[0013] In some embodiments, the thickness of the gasket is 0.4 mm to 0.6 mm.

[0014] In some embodiments, the gasket is a silicone gasket, the silicone gasket has a temperature resistance of more than 225°C, and the Shore hardness of the silicone gasket is 55°C~65°C.

[0015] In some embodiments, the material of the silicone gasket is any one of nitrile rubber, chloroprene rubber, hydrogenated nitrile rubber, Teflon, polyethylene terephthalate, epoxy resin and polycarbonate.

[0016] Beneficial effects of the inner liner riveting structure of the present invention:

[0017] (1) The inner liner riveting structure of the present invention is provided with a retaining edge and a washer on the riveted nut. The retaining edge can block the impact force generated when the rivet is tightened, and the washer can buffer the extrusion force of the retaining edge and the enamel layer around the opening of the hole, thereby avoiding quality problems such as porcelain explosion, whitening and cracks when the enamel inner liner nut is riveted, improving the qualified rate of the finished product of the enameled inner liner, and enabling the enameled inner liner to be mass-produced and applied.

[0018] (2) The inner liner rivet structure of the present invention is provided with a gasket on the rivet nut, and the gasket seals and covers the gap between the rivet nut and the opening, thereby reducing or preventing the steam generated by the household appliance from leaking from the gap, thereby better protecting the inner liner of the household appliance and increasing the service life of the inner liner.

[0019] To achieve the second objective above, the present invention provides the following technical solutions:

[0020] A method for manufacturing the above-mentioned inner liner riveting structure is provided, comprising the following steps:

[0021] S1, opening holes so that the holes pass through the substrate and the enamel layer of the inner tank in sequence, and putting the gasket on the riveted nut;

[0022] S2, placing the rivet nut into the hole, and using a rivet gun head to press the rivet nut into the hole until the stop edge and the opening circumference of the hole tightly clamp the washer;

[0023] S3, pull the rivet gun head outward to make the rivet nut protrude outward, and unscrew the rivet gun head.

[0024] In some embodiments, the enamel layer is prepared by the following steps:

[0025] S101, spraying an enamel layer on the inner tank of a household appliance by an electrostatic dry powder spraying process using a spray gun, wherein the spray pressure of the spray gun is 0.15 MPa to 0.3 MPa;

[0026] S102, placing the enamel layer in a sintering furnace for sintering, the sintering temperature is 820°C to 830°C, the sintering time is 3min to 5min, and the pressure inside the sintering furnace is 10Pa to 50Pa.

[0027] In some embodiments, the enamel layer has a thickness of 80 μm to 150 μm.

[0028] The manufacturing method of the inner liner riveting structure of the present invention has the following beneficial effects:

[0029] The manufacturing method of the inner liner riveting structure of the present invention can quickly and conveniently manufacture the inner liner riveting structure with good sealing performance and tensile resistance.

[0030] To achieve the third objective above, the present invention provides the following technical solutions:

[0031] Provided is a steam-toaster, comprising the above-mentioned inner container riveting structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of the inner pot of the steam-bake machine of Example 1.

[0033] Figure 2 It is a cross-sectional view of the rivet structure of the inner liner in Example 1.

[0034] Figure 3 It is a schematic diagram of the manufacturing process of the inner liner riveting structure of Example 2.

[0035] Reference numerals

[0036] Hole position 1; rivet nut 2; household appliance 3; inner liner 4; enamel layer 5; retaining edge 6; washer 7; boss 8; rivet gun head 9. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0038] To facilitate the description of the inner liner riveting structure of the present invention, the following embodiments are described using a steamer or toaster as an example. In actual applications, the inner liner riveting structure of the present invention is also applicable to other household appliances.

[0039] Example 1

[0040] The inner liner riveting structure disclosed in this embodiment, Figure 1-Figure 2 As shown, it includes a hole 1 and a rivet nut 2, wherein the hole 1 penetrates the substrate and the enamel layer 5 of the inner pot 4 of the household appliance 3, and the rivet nut 2 is embedded in the hole 1, that is, the rivet nut 2 is stably fixed inside the hole 1, so that the rivet nut 2 is arranged on the enamel layer 5 of the inner pot 4. Figure 2 As shown, the opening of the rivet nut 2 is turned outward to form a stop edge 6. Figure 2 As shown, the retaining edge 6 is pressed against the opening circumference of the hole 1, and the opening circumference is the enamel layer 5, that is, the retaining edge 6 is pressed against the enamel layer 5 of the opening circumference of the hole 1. A gasket 7 is sandwiched between the opening circumference of the hole 1 and the retaining edge 6, and the gasket 7 is sleeved on the rivet nut 2, and the inner ring wall of the gasket 7 seals and covers the gap between the rivet nut 2 and the hole 1, preventing the steam of the steam-toaster from leaking from the gap, avoiding rust and water leakage, and improving the service life and use effect of the steam-toaster.

[0041] In this embodiment, Figure 2 The surface of the enamel layer 5 is convex outward to form a boss 8, and the hole 1 is opened in the middle of the boss 8. The boss 8 makes the cracks generated during the riveting process diverge toward the outer side of the boss 8, reducing the degree of crack aggregation in the riveting area, and further eliminating or reducing the problems of porcelain explosion, whitening, and cracks that occur when the enamel liner 4 nut is riveted.

[0042] In this embodiment, the surface of the enamel layer 5 protrudes outward by 0.7 mm to form the boss 8. The protrusion height of the boss 8 is sufficient to disperse the cracks and will not affect the internal structure of the liner 4.

[0043] In this embodiment, Figure 2 As shown, the upper and lower surfaces of the gasket 7 are respectively pressed by the table surface of the boss 8 and the stop edge 6. The gasket 7 is positioned on the stop edge 6 and the table surface of the boss 8, and the stop edge 6 and the boss 8 press the entire surface of the gasket 7, and the gasket 7 can cushion all the stop edges 6.

[0044] In this embodiment, Figure 2 As shown, the cross section of the boss 8 is an isosceles trapezoid, and the bottom edge of the isosceles trapezoid gradually shortens on the side facing away from the enamel layer 5, so that the side of the boss 8 is a sloped transition section, so that the boss 8 has a better crack dispersion effect.

[0045] In this embodiment, the thickness of the washer 7 is 0.4 mm. If the thickness of the washer 7 is too large, the strength of the pull riveted structure will be affected.

[0046] In this embodiment, the gasket 7 is a silicone gasket 7, which has a temperature resistance of more than 225° C. and a Shore hardness of 55° C. The silicone gasket 7 has good elasticity, and a high temperature resistant silicone gasket 7 can adapt to the high temperature use environment of the inner liner 4.

[0047] In this embodiment, the material of the silicone gasket 7 is any one of nitrile rubber, chloroprene rubber, hydrogenated nitrile rubber, Teflon, polyethylene terephthalate, epoxy resin and polycarbonate.

[0048] In this embodiment, the hole 1 is a regular hexagonal hole, the rivet nut 2 is a hexagonal rivet nut, and the opposite side distance of the regular hexagonal hole 1 is preferably set to 6 mm, so that the hexagonal rivet nut can be placed in the corresponding hole 1 to form a good clearance fit. In practical applications, other shapes of hole 1 and rivet nut 2 can also be used. When the torque load moment can be satisfied, for example, other shapes such as quadrilaterals, pentagons, and heptagons can be used for assembly.

[0049] Example 2

[0050] The difference between this embodiment and embodiment 1 is that the surface of the enamel layer 5 protrudes outward by 1.1 mm to form the boss 8, the thickness of the gasket 7 is 0.6 mm, the temperature resistance of the silicone gasket 7 is above 225° C., the Shore hardness of the silicone gasket 7 is 65° C., and the opposite side distance of the regular hexagon of the hole position 1 is preferably set to 7 mm. The other components and principles of this embodiment are the same as those of embodiment 1 and will not be repeated here.

[0051] Example 3

[0052] The difference between this embodiment and embodiment 1 is that the surface of the enamel layer 5 protrudes outward by 1 mm to form the boss 8, the thickness of the gasket 7 is 0.5 mm, the temperature resistance of the silicone gasket 7 is above 225° C., the Shore hardness of the silicone gasket 7 is 60° C., and the opposite side distance of the regular hexagon of the hole position 1 is preferably set to 6.5 mm. The other components and principles of this embodiment are the same as those of embodiment 1 and will not be repeated here.

[0053] Example 4

[0054] This embodiment discloses a method for manufacturing the inner liner 4 riveted structure of embodiment 1, which can be referred to Figure 3 , which comprises the following steps:

[0055] S1, opening a hole 1, the hole 1 passes through the substrate and the enamel layer 5 of the inner tank 4 of the household appliance 3, and tightly fitting the washer 7 on the riveted nut 2;

[0056] S2, placing the rivet nut 2 into the hole 1, and using the rivet gun head 9 to screw the rivet nut 2 into the hole 1 until the retaining edge 6 and the opening circumference of the hole 1 tightly clamp the washer 7;

[0057] S3, pull the rivet gun head 9 outward to make the rivet nut 2 protrude outward, and unscrew the rivet gun head 9.

[0058] Specifically, take the washer 7 and insert it into the outer wall of the hexagonal rivet nut 2, and then put the rivet nut 2 into the hole 1 of the steamer. Put the rivet gun head 9 perpendicular to the end face of the rivet nut 2, and after the end face of the rivet gun head 9 is close to the rivet nut 2, press the rivet gun switch, the rivet gun will automatically screw into the rivet nut 2, and the rivet nut will be pulled by the screw on the rivet gun to cause longitudinal compression, and the thin-walled area at the end will be convex and deformed, and the riveted parts will be clamped to realize the riveting process. After completion, the rivet gun will automatically withdraw from the nut, and one riveting is completed.

[0059] In this embodiment, the enamel layer 5 is prepared by the following steps:

[0060] S101, spraying an enamel layer 5 on an inner container 4 of a household appliance 3 by an electrostatic dry powder spraying process using a spray gun, wherein the spray pressure of the spray gun is 0.15 MPa;

[0061] S102, placing the enamel layer 5 in a sintering furnace for sintering, the sintering temperature is 820°C, the sintering time is 3 minutes, and the pressure inside the sintering furnace is 10 Pa.

[0062] In this embodiment, the thickness of the enamel layer 5 is 80 μm.

[0063] Example 5

[0064] This embodiment discloses a method for manufacturing the inner liner 4 riveted structure of embodiment 1, which can be referred to Figure 3 , which comprises the following steps:

[0065] S1, opening a hole 1, the hole 1 passes through the substrate and the enamel layer 5 of the inner tank 4 of the household appliance 3, and tightly fitting the washer 7 on the riveted nut 2;

[0066] S2, placing the rivet nut 2 into the hole 1, and using the rivet gun head 9 to press the rivet nut 2 into the hole 1 until the retaining edge 6 and the opening circumference of the hole 1 tightly clamp the washer 7;

[0067] S3, pull the rivet gun head 9 outward to make the rivet nut 2 protrude outward, and unscrew the rivet gun head 9.

[0068] Specifically, take the washer 7 and insert it into the outer wall of the hexagonal rivet nut 2, and then put the rivet nut 2 into the hole 1 of the steamer. Place the rivet gun head 9 perpendicular to the end face of the rivet nut 2, and after the end face of the rivet gun head 9 is close to the rivet nut 2, press the rivet gun switch, and the pull rivet gun will automatically screw into the rivet nut 2. The rivet nut is pulled by rotating the screw on the rivet gun to cause longitudinal compression, and a convex deformation occurs in the thin-walled area at the end. The riveted part is clamped to realize the riveting process. After completion, the pull rivet gun automatically withdraws from the nut, and a riveting is completed.

[0069] In this embodiment, the enamel layer 5 is prepared by the following steps:

[0070] S101, spraying an enamel layer 5 on an inner container 4 of a household appliance 3 by an electrostatic dry powder spraying process using a spray gun, wherein the spray pressure of the spray gun is 0.3 MPa;

[0071] S102, placing the enamel layer 5 in a sintering furnace for sintering, the sintering temperature is 830°C, the sintering time is 5 minutes, and the pressure inside the sintering furnace is 50Pa.

[0072] In this embodiment, the thickness of the enamel layer 5 is 250 μm.

[0073] Example 6

[0074] This embodiment discloses a method for manufacturing the inner liner 4 riveted structure of embodiment 1, which can be referred to Figure 3 , which comprises the following steps:

[0075] S1, opening a hole 1, the hole 1 passes through the substrate and the enamel layer 5 of the inner tank 4 of the household appliance 3, and tightly fitting the washer 7 on the riveted nut 2;

[0076] S2, placing the rivet nut 2 into the hole 1, and using the rivet gun head 9 to press the rivet nut 2 into the hole 1 until the retaining edge 6 and the opening circumference of the hole 1 tightly clamp the washer 7;

[0077] S3, pull the rivet gun head 9 outward to make the rivet nut 2 protrude outward, and unscrew the rivet gun head 9.

[0078] Specifically, take the washer and insert it into the outer wall of the hexagonal rivet nut 2, and then put the rivet nut 2 into the hole 1 of the steamer. Put the rivet gun head 9 perpendicular to the end face of the rivet nut 2, and after the end face of the rivet gun head 9 is close to the rivet nut 2, press the rivet gun switch, the pull rivet gun will automatically screw into the rivet nut 2, and the rivet nut will be pulled by the screw on the rivet gun to cause longitudinal compression, and the thin-walled area at the end will be convex and deformed, and the riveted parts will be clamped to realize the riveting process. After completion, the pull rivet gun will automatically withdraw from the nut, and one riveting is completed.

[0079] In this embodiment, the enamel layer 5 is prepared by the following steps:

[0080] S101, spraying an enamel layer 5 on an inner container 4 of a household appliance 3 by an electrostatic dry powder spraying process using a spray gun, wherein the spray pressure of the spray gun is 0.2 MPa;

[0081] S102, placing the enamel layer 5 in a sintering furnace for sintering, the sintering temperature is 840°C, the sintering time is 4 minutes, and the pressure inside the sintering furnace is 20Pa.

[0082] In this embodiment, the thickness of the enamel layer 5 is 120 μm.

[0083] Performance testing:

[0084] The quality inspection of the inner liner riveting structure described in Example 1 is carried out: the riveted nut is subjected to a torque load capacity of ≥3N·m, and is lifted to a height of 150mm±50mm with a 0.5kg rubber hammer, and is continuously struck three times in the axial and radial directions, requiring that the riveted nut is not loose and that no noise is emitted when the parts are struck. It is observed that during the riveting process, no cracks, whitening, or porcelain explosion occurs on the edge of the riveted nut, indicating that the inner liner riveting structure of Example 1 can greatly improve the first-time qualified rate of the inner liner of the steamer and oven.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A liner riveting structure, Its characteristics are: It comprises a hole and a rivet nut, wherein the hole sequentially penetrates the substrate and the enamel layer of the inner container of the household appliance, the rivet nut is embedded in the hole, the opening of the rivet nut is turned outward to form a retaining edge, the retaining edge is pressed against the opening peripheral edge of the hole, a washer is sandwiched between the opening peripheral edge of the hole and the retaining edge, the washer is sleeved on the rivet nut, and the inner ring wall of the washer seals and covers the gap between the rivet nut and the hole; The surface of the enamel layer protrudes outward to form a boss, and the hole is opened in the middle of the boss; The surface of the enamel layer protrudes outward by 0.7 mm to 1.1 mm to form the boss; The upper surface and the lower surface of the gasket are pressed by the table surface of the boss and the stop edge respectively; The cross section of the boss is an isosceles trapezoid, and the bottom edge of the isosceles trapezoid gradually shortens along the side facing away from the enamel layer; The thickness of the gasket is 0.4 mm to 0.6 mm; The thickness of the enamel layer is 80 μm to 150 μm.

2. The inner liner riveting structure according to claim 1, Its characteristics are: The gasket is a silicone gasket, which has a temperature resistance of more than 225°C and a Shore hardness of 55°C to 65°C.

3. The inner liner riveting structure according to claim 2, Its characteristics are: The material of the silicone gasket is any one of nitrile rubber, chloroprene rubber, hydrogenated nitrile rubber, Teflon, polyethylene terephthalate, epoxy resin and polycarbonate.

4. A method for manufacturing an inner liner riveting structure, Its characteristics are: The manufacturing method of the liner riveting structure according to any one of claims 1 to 3 comprises the following steps: S1, opening holes so that the holes pass through the substrate and the enamel layer of the inner tank in sequence, and putting the gasket on the riveted nut; S2, placing the rivet nut into the hole, and using a rivet gun head to press the rivet nut into the hole until the stop edge and the opening circumference of the hole tightly clamp the washer; S3, pull the rivet gun head outward to make the rivet nut protrude outward, and unscrew the rivet gun head.

5. The method for manufacturing the inner liner riveting structure according to claim 4, Its characteristics are: The enamel layer is prepared by the following steps: S101, spraying an enamel layer on the inner tank of a household appliance by an electrostatic dry powder spraying process using a spray gun, wherein the spray pressure of the spray gun is 0.15 MPa to 0.3 MPa; S102, placing the enamel layer in a sintering furnace for sintering, the sintering temperature is 820°C to 830°C, the sintering time is 3min to 5min, and the pressure inside the sintering furnace is 10Pa to 50Pa.

6. A steaming and baking machine, Its characteristics are: It comprises the inner liner riveting structure as described in any one of claims 1 to 3.

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