CN107397422B - Preparation method of double-layer soaking pot - Google Patents
Preparation method of double-layer soaking pot Download PDFInfo
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- CN107397422B CN107397422B CN201610344096.2A CN201610344096A CN107397422B CN 107397422 B CN107397422 B CN 107397422B CN 201610344096 A CN201610344096 A CN 201610344096A CN 107397422 B CN107397422 B CN 107397422B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
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Abstract
The invention relates to a preparation method of a double-layer soaking pot, which comprises the following steps: preparing an inner pot and an outer pot; coating a metal powder adhesive layer on the outer side surface of the inner pot and/or the inner side surface of the outer pot, pressing, baking and sintering; sleeving the inner pot in the outer pot, sealing and fixedly connecting the top ends of the inner pot and the outer pot, and forming a heat conducting cavity between the inner pot and the outer pot; and extracting air in the heat conduction cavity from a vacuumizing hole formed in the outer pot to enable the heat conduction cavity to be in a negative pressure state, injecting a liquid phase change working medium through the vacuumizing hole, and sealing the vacuumizing hole. The porous copper layer can ensure that the liquid phase change working medium is volatilized into gas and then is transmitted to the condensing end at the top of the heat conduction cavity to be diffused, the cooled liquid flows to the bottom of the heat conduction cavity along the porous copper layer and is heated again to be evaporated, and the heating process is repeated in a circulating manner, so that the temperature fields of all parts of the whole inner pot are basically kept consistent.
Description
Technical Field
The invention relates to a double-layer soaking pot and a preparation method thereof, belonging to the field of double-layer pots.
Background
The inner container of the existing electromagnetic heating electric cooker or pressure cooker is generally an aluminum-stainless steel composite plate or an aluminum-stainless steel composite bottom plate, and the non-stick effect of the surface of the inner layer in the cooking process is usually realized by spraying non-stick paint such as PTFE (Teflon) on the aluminum surface of the inner layer. However, the non-stick coatings have poor wear resistance and are easy to fall off, potential safety hazards can be caused to the health of consumers after the non-stick coatings are absorbed by human bodies, and how to realize uniform heating without spraying PTFE to prevent the pan bodies from sticking is an urgent problem to be solved by technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a double-layer soaking pan, and overcomes the defects that in the prior art, a pan is easy to stick due to uneven heating of a pan body or PTFE is sprayed on the inner wall of the pan body to realize a non-stick effect, but potential safety hazards are caused to human health due to easy falling.
The technical scheme for solving the technical problems is as follows: a preparation method of a double-layer soaking pan comprises the following steps:
step 1), respectively preparing an inner pot and an outer pot which have the same shape and different volumes;
step 2) coating a metal powder adhesive layer on the outer side surface of the inner pot and/or the inner side surface of the outer pot, pressing the metal powder adhesive layer by using a die, baking the inner pot and/or the outer pot coated with the metal powder adhesive layer to completely volatilize nonmetal in the metal powder adhesive layer, and finally sintering the inner pot and/or the outer pot coated with the metal powder adhesive layer;
step 3), sleeving the inner pot in the outer pot, fixedly connecting the top end of the inner pot with the top end of the outer pot in a sealing manner, and forming a heat conduction cavity between the inner pot and the outer pot;
and 4), extracting air in the heat conduction cavity from a vacuumizing hole formed in the outer pot to enable the heat conduction cavity to be in a negative pressure state, injecting a liquid phase change working medium through the vacuumizing hole, and sealing the vacuumizing hole. The liquid phase-change working medium can be water, ammonia gas or normal hexane and the like.
The method has the beneficial effects that: the outer side surface of the inner pot and/or the inner side surface of the outer pot are coated with the metal powder glue layer, the metal powder glue layer is pressed, heating and baking are carried out to completely volatilize nonmetal in the metal powder glue layer, sintering and cooling are carried out to prepare the porous metal layer, the porous copper layer can ensure that a liquid phase change working medium is volatilized into gas and then is conducted to a condensation end at the top of the heat conduction cavity for diffusion, the cooled liquid flows to the bottom of the heat conduction cavity along the porous copper layer and is heated again for evaporation, and the process is repeated in a circulating manner in the heating process, so that the temperature fields of all parts of the whole inner pot are basically kept consistent.
On the basis of the technical scheme, the invention can be further improved as follows.
The invention relates to a preparation method of a double-layer soaking pot, further, the step of baking the inner pot and/or the outer pot coated with the metal powder glue layer in the step (2) comprises the following steps: and (2) placing the inner pot and/or the outer pot in a heating furnace, heating for 15-25 h at the temperature of 130-150 ℃ to completely volatilize the water in the metal powder adhesive layer, and then heating for 20-40 h at the temperature of 200-300 ℃ to completely volatilize the adhesive in the metal powder adhesive layer.
The invention relates to a preparation method of a double-layer soaking pot, further, the step (2) of sintering the inner pot and/or the outer pot coated with the metal powder glue layer comprises the following steps: and (3) placing the inner pot and/or the outer pot in a vacuum furnace, heating at a heating rate of 55-65 ℃/h to 800-900 ℃, sintering at a constant temperature for 0.6-1.4 h, and cooling.
The adoption of the further beneficial effects is as follows: firstly, heating in a low-temperature section of 130-150 ℃ can ensure the moisture in the metal powder glue layer, heating in a low-temperature section of 200-300 ℃ can completely volatilize the colloid, and then sintering at 800-900 ℃ can ensure that the metal oxide or the metal compound is successfully reduced into a metal simple substance; however, too high a temperature may reduce the porosity of the metal layer.
The invention further relates to a preparation method of the double-layer soaking pot, wherein the particle size of the metal powder is 50-100 mu m.
The adoption of the further beneficial effects is as follows: the smaller the particle size of the metal powder in the range is, the higher the porosity and permeability of the sintered liquid absorption core is, the best working effect is achieved, and the pot body can be ensured to achieve a good uniform heating effect.
The preparation method of the double-layer soaking pot further comprises the step of coating the metal powder glue layer to the thickness of 0.4-1 mm.
The adoption of the further beneficial effects is as follows: the porous metal layer with the thickness within the range of 0.3-0.8 mm can be obtained by setting the coating thickness of the metal powder adhesive layer, in the heating process, liquid working media are heated to a certain temperature (100-150 ℃) and are volatilized into gas and are transferred to the condensation end at the top of the heat conduction cavity, the heat is rapidly transferred to the inner pot from the gaseous working media along with the heat, the cooled steam can be condensed and is converted into liquid and is adsorbed in the porous metal layer on the outer wall of the inner pot and/or the inner wall of the outer pot, the liquid working media flow to the bottom of the pot along the porous metal layer under the action of capillary force and are heated again at the bottom of the heat conduction cavity to be evaporated again, and the condensed gaseous working media can be ensured to smoothly flow into the bottom of the pot in a short time after being converted into.
The preparation method of the double-layer soaking pot further comprises the step that the metal powder adhesive layer comprises metal powder and a binder, wherein the metal powder accounts for 40-60% of the total volume of the metal powder and the binder. The binder may be selected as Emultex D64 binder.
The adoption of the further beneficial effects is as follows: the metal powder glue layer is coated with the metal powder glue layer by the metal powder colloid, wherein the metal powder accounts for 40-60% of the total volume of the metal powder and the binder, so that the shrinkage rate of the sintered metal powder glue layer is about 20-30%, and the porous copper layer prepared by pressing, sintering and cooling the metal powder glue layer has the porosity in a proper range and simultaneously improves the binding power of the metal powder glue layer.
The invention further discloses a preparation method of the double-layer soaking pot.
The preparation method of the double-layer soaking pot further comprises the step of enabling the metal powder glue layer to further comprise CuCl2·2H2O, the CuCl2·2H2The dosage of O is 6-18% of the total weight of the mixture of the copper powder or the nickel powder and the binder.
The adoption of the further beneficial effects is as follows: the porosity of the porous copper layer prepared after the metal powder adhesive layer is sintered can be effectively adjusted. This scheme can obtain the porosity setting on porous copper layer at 30 ~ 50% scope, when can effectively guarantee the structure adhesive force fastening, improves liquid phase change working medium and gets back to the bottom in heat conduction chamber through the good suction on porous copper layer, and then the pot heating process has better samming effect in realizing.
The invention relates to a preparation method of a double-layer soaking pot, comprising the following steps ofOne step, the vacuum degree 10 of the heat conducting cavity in a negative pressure state-3～10-1Pa。
The preparation method of the double-layer soaking pot further comprises the following steps that the distance between the inner pot and the outer pot is 2-3 mm; the thickness of the inner pot and the outer pot is 0.5 mm-1.5 mm.
The adoption of the further beneficial effects is as follows: the distance between the inner pot and the outer pot is set to be 2-3 mm, so that steam can be effectively and smoothly and uniformly distributed in the heat conducting cavity in the heating process.
The invention further discloses a preparation method of the double-layer soaking pot, wherein the inner pot is made of corrosion-resistant materials, and the outer pot is made of magnetic materials.
The inner pot and the outer pot are both made of stainless steel plates. Furthermore, the stainless steel plate for manufacturing the inner pot is a 304 stainless steel plate; the stainless steel plate for manufacturing the outer pot is a 430 stainless steel plate. Because 430 stainless steel has better magnetic conductivity, this double-deck samming pot can adopt the electromagnetic heating mode to realize that stainless steel inner bag pot physics is not stained with the effect. The 304 stainless steel plate has excellent corrosion resistance, and the service life of the double-layer soaking pot can be prolonged.
The preparation method of the double-layer soaking pot further comprises the step 2) that the pressure of the die for pressing the metal powder glue layer is 10-20 Pa.
The adoption of the further beneficial effects is as follows: the adhesive force is improved, a more stable porous metal layer is prepared, and the porosity is uniform.
The invention also provides an electric cooker which comprises a cooker body shell and an inner container made of the double-layer soaking cooker, wherein the inner container is positioned in the cooker body shell.
According to the double-layer soaking pot prepared by the method, after heat is conducted to the liquid phase change working medium at the bottoms of the outer pot and the inner pot, the liquid phase change working medium is immediately volatilized into gas and is conducted to the condensing end at the top of the heat conducting cavity to be diffused, meanwhile, the heat is uniformly conducted to the inner pot along with the gas, the cooled liquid is condensed and is converted into liquid, the liquid flows to the bottom of the heat conducting cavity along the porous copper layer and is heated again to be evaporated, and the heating process is circularly repeated, so that the temperature fields of all parts of the whole inner pot are basically kept consistent (+/-3 ℃).
Drawings
FIG. 1 is a schematic view of a double-layer soaking pot according to the present invention;
fig. 2 is an enlarged schematic view of fig. 1A.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the inner pot, 2, the outer pot, 3, a porous copper layer, 4, a heat conducting cavity, 5, a metal hollow pipe, 6 and a vacuumizing hole.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The invention discloses a preparation method of a double-layer soaking pot, which comprises the following steps: step 1, adopting a 403 stainless steel sheet with the thickness of 1mm to perform punch forming in a die to manufacture an outer pot, and adopting a 304 stainless steel sheet with the thickness of 1mm to perform punch forming in a die with the same shape and smaller than the die size of the outer pot to manufacture an inner pot, wherein the top edges of the inner pot and the outer pot are provided with extended platform-shaped structures;
respectively pressing the copper powder adhesive layers on the inner surface of the outer pot and the shell surface of the inner pot under the assistance of a die with the same shape as the pot, wherein the pressure in the pressing process is 10-20 Pa, and heating the copper powder adhesive layers in a resistance heating furnace at about 130-150 ℃ for about 20 hours to volatilize the moisture in the binder; subsequently, they were heated at 250 ℃ for a further about 30min, so that the binder was completely evaporated; finally, heating to 800 ℃ in a vacuum furnace at a heating rate of 60 ℃/h, sintering at a constant temperature for 1h, and cooling along with the furnace; thus, the preparation of the porous copper layer is completed, and the shrinkage rate of the copper powder adhesive layer after sintering is about 20-30%.
And 4, drilling a vacuumizing hole 6 with the diameter on the upper part of the outer layer pot, inserting a metal hollow copper pipe 5 with the same diameter, and welding and sealing the contact position of the copper pipe and the pot wall.
And 6, welding and sealing the outer end of the metal hollow copper pipe on the shell in a vacuum environment. Ensure that the cavity of the whole pan maintains a near vacuum environment (10)-3～10-1Pa), and obtaining the double-layer soaking pot, in particular to an electromagnetic heating soaking pot with a double-layer structure.
Comparative examples 1 and 2 and examples 1 to 7 all used the above-described preparation method, in which the raw material, thickness, particle size of copper powder, and CuCl of the copper powder paste layer were specifically set2·2H2And O, setting parameters of specific dosage are shown in a table 1, and a comparison document 3 shows the pot without the liquid absorption core in the structure.
TABLE 1 influence of preparation parameters of porous copper layer on soaking effect in preparation of double-layer soaking pot
According to the invention, the temperature field of the stainless steel inner pot is accurately controlled, the influence of different porous copper layers on the temperature field is tested, and table 1 shows that when specific parameters such as tables are set in the copper powder adhesive layer, the temperature of each part in the stainless steel inner pot temperature field is basically consistent, the maximum temperature difference is positive or negative 0.3, the particle size of the copper powder is smaller, the obtained porosity is larger, the heat transfer efficiency is higher, the test temperature difference is smaller, the porosity is larger than 50%, and the liquid absorption effect is influenced possibly due to overlarge porosity, so that the uniformity effect is slightly poor. Namely, the copper powder accounts for 40-60% of the total volume of the copper powder and the binder; the particle size of the copper powder is 50-100 mu m, the coating thickness of the copper powder adhesive layer is 0.4-1 mm, and the CuCl2·2H2The amount of O is 6-18% of the total weight of the copper powder and the binder, and the parameters within the range can ensure that different areas of the inner pot are uniformly heated, so that the stainless steel inner container has a good physical non-stick effect in the cooking process.
The double-layer soaking pot prepared by the preparation method of the double-layer soaking pot disclosed by the invention and shown in the figures 1 and 2 comprises an inner pot 1 and an outer pot 2, wherein the inner pot 1 is sleeved in the outer pot 2, and the top end of the inner pot 1 is hermetically connected with the top end of the outer pot 2; a heat conduction cavity 4 in a negative pressure state is formed between the inner pot 1 and the outer pot 2, and liquid phase-change working media are filled at the bottom of the heat conduction cavity 4; a porous copper layer 3 is arranged on the outer side surface of the inner pot 1 and/or the inner side surface of the outer pot 2. The shape of the inner pot and the outer pot can be square or round or oval.
The inner pot and the outer pot are made of stainless steel plates. Specifically, the stainless steel plate for manufacturing the inner pot is a 304 stainless steel plate; the stainless steel plate for manufacturing the outer pot is a 430 stainless steel plate. Because 430 stainless steel has better magnetic conductivity, the double-layer soaking pan can realize the physical non-stick effect of the stainless steel inner container pan by adopting an electromagnetic heating mode; the 304 stainless steel plate has excellent corrosion resistance, and the service life of the double-layer soaking pot can be prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (12)
1. The preparation method of the double-layer soaking pot is characterized by comprising the following steps:
step 1), respectively preparing an inner pot and an outer pot which have the same shape and different volumes;
step 2) coating a metal powder adhesive layer on the outer side surface of the inner pot and/or the inner side surface of the outer pot, pressing the metal powder adhesive layer by using a die, baking the inner pot and/or the outer pot coated with the metal powder adhesive layer to completely volatilize nonmetal in the metal powder adhesive layer, and finally sintering the inner pot and/or the outer pot coated with the metal powder adhesive layer;
step 3), sleeving the inner pot in the outer pot, fixedly connecting the top end of the inner pot with the top end of the outer pot in a sealing manner, and forming a heat conduction cavity between the inner pot and the outer pot;
and 4), extracting air in the heat conduction cavity from a vacuumizing hole formed in the outer pot to enable the heat conduction cavity to be in a negative pressure state, injecting a liquid phase change working medium through the vacuumizing hole, and sealing the vacuumizing hole.
2. The method for preparing the double-layer soaking pot according to claim 1, wherein the step of baking the inner pot and/or the outer pot coated with the metal powder glue layer in the step 2) comprises the following steps: and placing the inner pot and/or the outer pot in a heating furnace, heating for 15-25 h at the temperature of 130-150 ℃ to completely volatilize the water in the metal powder adhesive layer, and then heating for 20-40 h at the temperature of 200-300 ℃ to completely volatilize the nonmetal in the metal powder adhesive layer.
3. The method for preparing the double-layer soaking pot according to claim 2, wherein the step of sintering the inner pot and/or the outer pot coated with the metal powder glue layer in the step 2) comprises the following steps: and (3) placing the inner pot and/or the outer pot in a vacuum furnace, heating at a heating rate of 55-65 ℃/h to 800-900 ℃, sintering at a constant temperature for 0.6-1.4 h, and cooling.
4. The method for preparing a double-layer soaking pot according to claim 1, wherein the particle size of the metal powder in the metal powder glue layer is 50-100 μm.
5. The preparation method of the double-layer soaking pot according to claim 1, wherein the coating thickness of the metal powder glue layer is 0.4 mm-1 mm.
6. The preparation method of the double-layer soaking pot according to claim 1, wherein the metal powder glue layer comprises metal powder and a binder, and the metal powder accounts for 40-60% of the total volume of the metal powder and the binder.
7. The method for preparing the double-layer soaking pan according to claim 6, wherein the metal powder in the metal powder glue layer is copper powder or nickel.
8. The method for preparing a double-layer soaking pot according to claim 7, wherein the metal powder glue layer further comprises CuCl2·2H2O, the CuCl2·2H2The dosage of O is 6-18% of the total weight of the mixture of the copper powder or the nickel powder and the binder.
9. The method for preparing a double-layer soaking pan as claimed in any one of claims 1 to 8, wherein the heat conducting cavity is in a vacuum degree 10 of a negative pressure state-3～10-1Pa。
10. The preparation method of the double-layer soaking pot according to any one of claims 1 to 8, wherein the distance between the inner pot and the outer pot is 2mm to 3 mm; the thickness of the inner pot and the outer pot is 0.5 mm-1.5 mm.
11. The method for preparing a double-layer soaking pan according to any one of claims 1 to 8, wherein the inner pan is made of corrosion-resistant material, and the outer pan is made of magnetic conductive material.
12. The method for preparing the double-layer soaking pan according to any one of claims 1 to 8, wherein the pressure of the step 2) for pressing the metal powder glue layer by using the mold is 10-20 Pa.
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| CN109862756B (en) * | 2019-03-11 | 2020-08-11 | 北京航空航天大学 | Low-altitude emergency active thermal control system and method based on porous material evaporative cooling device |
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