Machining process method of all-glass double-vacuum heat collecting tube type pressure-bearing enamel inner container

Abstract

The invention belongs to the technical field of heat collecting pipe inner container machining, and particularly relates to a machining process method of an all-glass double-vacuum heat collecting pipe type pressure-bearing enamel inner container, which comprises the following specific steps of: 1, firstly, adopting a low-carbon steel pipe as a heat exchange blind pipe, sealing one end of the heat exchange blind pipe by adopting a special sealing machine, and after the sealing is finished, sealing the other end of the heat exchange blind pipe by adopting a special sealing machine; the method comprises the following steps of: performing 1.0 MPa pressure detection on a to-be-enamelled base surface, putting the to-be-enamelled base surface into a shot blasting machine for cleaning after the to-be-enamelled base surface is detected to be free of leakage and qualified, removing an oxide layer, rust and other impurities on the surface of the to-be-enamelled base surface, and performing enameling treatment on the to-be-enamelled base surface for later use after the to-be-enamelled base surface is detected to be qualified. The heat exchange blind pipe adopts a steel pipe sealing process, the blind pipe end is in a smooth spherical shape, the requirement of enamel for the base surface shape is met, the quality of the inner container enamel can be effectively guaranteed, and later use is better facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of heat collecting tube liner processing, and in particular to a processing method of a full-glass double vacuum heat collecting tube type pressure-bearing enamel liner. Background Art

[0002] To upgrade the non-pressurized vacuum collector tube solar water heater and improve the user's hot water experience. The previous non-pressurized water heater had low hot water pressure. When mixed with cold water, the water pressure changes will cause the water to be hot and cold, which is not a good experience for users and cannot meet the needs of using hot water in multiple places at the same time.

[0003] In view of the shortcomings of the products currently on the market, a pressure-bearing enamel water heater is proposed. The inner tank of the water heater operates under pressure. When using hot water, the water pressure is sufficient and the flow rate is large. It can meet the needs of multiple places using hot water at the same time, and there will be no phenomenon of the water being hot and cold.

[0004] The inner tank of the pressure-bearing enamel water heater is a closed structure with several enamel heat exchange blind pipes built in. The condensing end of the all-glass double vacuum collector tube extends into the blind pipe. The cavity of the blind pipe is fully coated with thermal grease. The heat collected by the collector tube is transferred to the water in the water heater through the thermal grease and the heat exchange blind pipe and stored for future use.

[0005] Since the enamel liner has a plurality of heat exchange blind tubes extending into the liner, the conventional rolling enamel method cannot ensure good enamel quality on the surface of the heat exchange blind tubes.

[0006] To this end, a processing method for a full-glass double vacuum collector tube-type pressure-bearing enamel liner is proposed to solve the above-mentioned problems. Summary of the invention

[0007] The object of the present invention is to provide a processing method for an all-glass double vacuum heat-collecting tube-type pressure-bearing enamel inner tank to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a processing method for an all-glass double vacuum collector tube type pressure-bearing enamel liner, the specific steps of the processing method are as follows:

[0009] Step 1: First, the heat exchange blind pipe uses a low-carbon steel pipe, and one end of it is sealed with a special sealing machine. After sealing, a 1.0MPa pressure test is carried out. After checking that there is no leakage and passing, it is put into a shot blasting machine for cleaning to remove the surface oxide layer, rust and other impurities. Then the outer surface of the blind pipe is enameled. The enamel inspection is qualified and it is ready for use;

[0010] Step 2: Weld the inner tube, flangeless head, PT valve seat, hot water pipe and cold water pipe together to form a semi-finished inner tube. The semi-finished inner tube is sandblasted for the first time using a sandblasting machine to clean the inner wall.

[0011] Step 3: Clean the surface oxide layer of the heat exchange blind tube to be welded with qualified enamel, assemble and weld it with the semi-finished inner tank after sandblasting, use special tooling during assembly to ensure that all blind tubes are accurately positioned and not skewed, and then weld and fix them. During welding, adjust the welding voltage and current to appropriate values ​​to ensure that there is no excessive oxidation on the back of the weld; then assemble the flanged head and weld it to form a welded inner tank assembly;

[0012] Step 4: Use a special inspection tool to check the position accuracy of the blind pipe to see if all the blind pipes are skewed. All the blind pipes are qualified if they can be smoothly inserted into the tool after inspection;

[0013] Step 5: Place the inner tank welding assembly into the sandblasting machine for secondary sandblasting, and clean the inner surface of the flanged head and the back of the welding annular seam by sandblasting;

[0014] Step 6: After the secondary sandblasting is completed, the inner tank welding assembly is subjected to a 0.8MPa pressure test. There should be no leakage at all welds and no abnormal deformation of the inner tank;

[0015] Step 7: Put the qualified sandblasted inner tank into the enameling machine, adjust the spraying time setting of the enameling machine, and control the spraying amount, which can ensure the ready-made continuous glaze surface of the inner tank, and prevent the end of the blind pipe from being stained with too much glaze slurry and damaging the glaze surface of the inner tank;

[0016] Step 8: After the enameling is completed, transfer to the drying room and control the drying temperature at 90-120℃ for drying;

[0017] Step 9: After drying, the inner tank is inspected and cleaned, and the excess glaze on the inner tank water pipe thread is cleaned up, and then transferred to the enamel sintering furnace for sintering. After sintering at 840-860℃ for 5 minutes, the enamel inner tank is formed;

[0018] Step 10: The enamel liner is inspected for appearance, and it is qualified if there is no exposed bottom, burning, pores, impurities, or orange peel; the thickness of the enamel layer is inspected by a special thickness gauge, and the thickness is controlled at 0.20-0.45mm;

[0019] Step 11: Use the blind pipe position inspection tool to inspect, and all blind pipes can be smoothly transferred into the inspection tool as qualified products.

[0020] Preferably, the specific structure of the pressure-bearing enamel inner liner includes an inner liner middle tube, a flanged head is provided at the right end of the inner liner middle tube, a flangeless head is provided at the left end of the inner liner middle tube, a PT valve pipe seat is fixedly provided on the left side wall of the flangeless head, a magnesium rod hole seat is provided at the lower side wall of the inner liner middle tube, a magnesium rod is provided inside the magnesium rod hole seat, a hot water pipe is provided at the left end of the magnesium rod hole seat, a cold water pipe is provided at the right end of the magnesium rod hole seat, and evenly arranged blind tubes are provided inside the inner liner middle tube, and the outside of the evenly arranged blind tubes is coated with enamel coating.

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

[0022] This technical method proposes a solution to this problem and has achieved good results in practice. The basic requirement of the enamel process for the enamel base surface is that the base surface should be flat and smooth without sharp corners and edges. The heat exchange blind tube of this technology adopts a steel pipe sealing process. The blind tube end is a smooth spherical shape, which meets the requirements of enamel for the base surface shape. The heat exchange blind tube extends into the inner tank to a depth of about 150mm. If the inner tank is directly poured with glaze and rolled, the blind tube end of the heat exchange blind tube will extend too far into the inner tank, and the glaze slurry will be difficult to cover the surface. If too much glaze slurry is poured, the excess glaze slurry on the blind tube will slide off and damage the glaze surface on the inner surface of the inner tank. This method can effectively ensure the quality of the inner tank enamel when processing the inner tank, which is more conducive to later use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the side structure.

[0025] In the figure: 1 inner tube, 2 flanged head, 3 flangeless head, 4 PT valve pipe seat, 5 magnesium rod hole seat, 6 magnesium rod, 7 hot water pipe, 8 cold water pipe, 9 blind pipe. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Example:

[0029] See also Figure 1-2 , the present invention provides a technical solution:

[0030] A processing method for a full-glass double vacuum heat-collecting tube-type pressure-bearing enamel liner, the specific steps of the processing method are as follows:

[0031] Step 1: First, the heat exchange blind pipe uses a low-carbon steel pipe, and one end of it is sealed with a special sealing machine. After sealing, a 1.0MPa pressure test is carried out. After checking that there is no leakage and passing, it is put into a shot blasting machine for cleaning to remove the surface oxide layer, rust and other impurities. Then the outer surface of the blind pipe is enameled. The enamel inspection is qualified and it is ready for use;

[0032] Step 2: Weld the inner tube, flangeless head, PT valve seat, hot water pipe and cold water pipe together to form a semi-finished inner tube. The semi-finished inner tube is sandblasted for the first time using a sandblasting machine to clean the inner wall.

[0033] Step 3: Clean the surface oxide layer of the heat exchange blind tube to be welded with qualified enamel, assemble and weld it with the semi-finished inner tank after sandblasting, use special tooling during assembly to ensure that all blind tubes are accurately positioned and not skewed, and then weld and fix them. During welding, adjust the welding voltage and current to appropriate values ​​to ensure that there is no excessive oxidation on the back of the weld; then assemble the flanged head and weld it to form a welded inner tank assembly;

[0034] Step 4: Use a special inspection tool to check the position accuracy of the blind pipe to see if all the blind pipes are skewed. All the blind pipes are qualified if they can be smoothly inserted into the tool after inspection;

[0035] Step 5: Place the inner tank welding assembly into the sandblasting machine for secondary sandblasting, and clean the inner surface of the flanged head and the back of the welding annular seam by sandblasting;

[0036] Step 6: After the secondary sandblasting is completed, the inner tank welding assembly is subjected to a 0.8MPa pressure test. There should be no leakage at all welds and no abnormal deformation of the inner tank;

[0037] Step 7: Put the qualified sandblasted inner tank into the enameling machine, adjust the spraying time setting of the enameling machine, and control the spraying amount, which can ensure the ready-made continuous glaze surface of the inner tank, and prevent the end of the blind pipe from being stained with too much glaze slurry and damaging the glaze surface of the inner tank;

[0038] Step 8: After the enameling is completed, transfer to the drying room and control the drying temperature at 90-120℃ for drying;

[0039] Step 9: After drying, the inner tank is inspected and cleaned, and the excess glaze on the inner tank water pipe thread is cleaned up, and then transferred to the enamel sintering furnace for sintering. After sintering at 840-860℃ for 5 minutes, the enamel inner tank is formed;

[0040] Step 10: The enamel liner is inspected for appearance, and it is qualified if there is no exposed bottom, burning, pores, impurities, or orange peel; the thickness of the enamel layer is inspected by a special thickness gauge, and the thickness is controlled at 0.20-0.45mm;

[0041] Step 11: Use the blind pipe position inspection tool to inspect, and all blind pipes can be smoothly transferred into the inspection tool as qualified products.

[0042] The specific structure of the pressure-bearing enamel inner liner includes an inner liner middle tube 1, a flanged head 2 is provided at the right end of the inner liner middle tube 1, a flangeless head 3 is provided at the left end of the inner liner middle tube 1, a PT valve pipe seat 4 is fixedly provided on the left side wall of the flangeless head 3, a magnesium rod hole seat 5 is provided on the lower side wall of the inner liner middle tube 1, a magnesium rod 6 is provided inside the magnesium rod hole seat 5, a hot water pipe 7 is provided at the left end of the magnesium rod hole seat 5, a cold water pipe 8 is provided at the right end of the magnesium rod hole seat 5, and evenly arranged blind tubes 9 are provided inside the inner liner middle tube 1, and the outer parts of the evenly arranged blind tubes 9 are coated with enamel coating.

[0043] Working principle: First, one end of the blind pipe 9 is sealed with a special sealing machine. After sealing, a 1.0MPa pressure test is performed. After checking that there is no leakage and passing the test, it is placed in a shot blasting machine for cleaning to remove the surface oxide layer, rust and other impurities. Then the outer surface of the blind pipe 9 is enameled. After the enamel inspection is passed, it is ready for use. The inner tank middle tube 1, the flangeless head 3, the PT valve pipe seat 4, the hot water pipe 7 and the cold water pipe 8 are welded together to form a semi-finished inner tank. The semi-finished inner tank is sandblasted for the first time with a sandblasting machine to clean the inner wall; the enamel is passed. The surface oxide layer of the blind tube 9 to be welded is cleaned off, and it is assembled and welded with the semi-finished inner tank after sandblasting. Special tooling is used during assembly to ensure that all blind tubes 9 are accurately positioned and not skewed, and then welded and fixed. During welding, the welding voltage and current are adjusted to appropriate values ​​to ensure that there is no excessive oxidation on the back of the weld; then the flanged head is assembled and welded to form a welded inner tank assembly. Special inspection tooling is used for the position accuracy of the blind tube 9 to check whether all blind tubes 9 are skewed. All blind tubes 9 are inspected by tooling, and the tooling can be smoothly inserted as qualified; the inner tank is assembled. The welding assembly is placed in the sandblasting machine for secondary sandblasting. The inner surface of the flanged head 2 and the back of the welding ring seam are cleaned by sandblasting. After the secondary sandblasting, the inner tank welding assembly is tested at 0.8MPa pressure. There should be no leakage at all welds and no abnormal deformation of the inner tank. The inner tank that has passed the sandblasting is placed in the enameling machine, and the spraying time setting of the enameling machine is adjusted to control the spraying amount, which can ensure that the inner tank surface has a ready-made continuous glaze surface, and the end of the blind pipe will not be stained with too much glaze slurry and damage the glaze surface of the inner tank surface. After the enameling is completed, it is transferred to the drying room, and the drying temperature is controlled at 90-12 0℃, and then dry it; after drying, the inner tank is inspected and cleaned, and the excess glaze on the inner tank water pipe thread is cleaned up, and then it is transferred to the enamel sintering furnace for sintering. After sintering at 840-860℃ for 5 minutes, the finished enamel inner tank is formed; the enamel inner tank is inspected for glaze appearance, and it is qualified if there is no exposed bottom, burnt, pores, impurities, and orange peel; the thickness of the enamel layer is inspected by a special thickness gauge, and the thickness is controlled at 0.20-0.45mm; the blind pipe position inspection tool is used for inspection, and all blind pipes 9 can smoothly transfer the inspection tool to the qualified products.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A processing method for a full-glass double vacuum heat-collecting tube-type pressure-bearing enamel liner, characterized in that: The specific steps of the processing method are as follows: Step 1: First, the heat exchange blind pipe uses a low-carbon steel pipe, and one end of it is sealed with a special sealing machine. After sealing, a 1.0MPa pressure test is carried out. After checking that there is no leakage and passing, it is put into a shot blasting machine for cleaning to remove the surface oxide layer, rust and other impurities. Then the outer surface of the blind pipe is enameled. The enamel inspection is qualified and it is ready for use; Step 2: Weld the inner tube, flangeless head, PT valve seat, hot water pipe and cold water pipe together to form a semi-finished inner tube. The semi-finished inner tube is sandblasted for the first time using a sandblasting machine to clean the inner wall. Step 3: Clean the surface oxide layer of the heat exchange blind tube to be welded with qualified enamel, assemble and weld it with the semi-finished inner tank after sandblasting, use special tooling during assembly to ensure that all blind tubes are accurately positioned and not skewed, and then weld and fix them. During welding, adjust the welding voltage and current to appropriate values ​​to ensure that there is no excessive oxidation on the back of the weld; then assemble the flanged head and weld it to form a welded inner tank assembly; Step 4: Use a special inspection tool to check the position accuracy of the blind pipe to see if all the blind pipes are skewed. All the blind pipes are qualified if they can be smoothly inserted into the tool after inspection; Step 5: Place the inner tank welding assembly into the sandblasting machine for secondary sandblasting, and clean the inner surface of the flanged head and the back of the welding annular seam by sandblasting; Step 6: After the secondary sandblasting is completed, the inner tank welding assembly is subjected to a 0.8MPa pressure test. There should be no leakage at all welds and no abnormal deformation of the inner tank; Step 7: Put the qualified sandblasted inner tank into the enameling machine, adjust the spraying time setting of the enameling machine, and control the spraying amount, which can ensure the ready-made continuous glaze surface of the inner tank, and prevent the end of the blind pipe from being stained with too much glaze slurry and damaging the glaze surface of the inner tank; Step 8: After the enameling is completed, transfer to the drying room and control the drying temperature at 90-120℃ for drying; Step 9: After drying, the inner tank is inspected and cleaned, and the excess glaze on the inner tank water pipe thread is cleaned up, and then transferred to the enamel sintering furnace for sintering. After sintering at 840-860℃ for 5 minutes, the enamel inner tank is formed; Step 10: The enamel liner is inspected for appearance, and it is qualified if there is no exposed bottom, burning, pores, impurities, or orange peel; the thickness of the enamel layer is inspected by a special thickness gauge, and the thickness is controlled at 0.20-0.45mm; Step 11: Use the blind pipe position inspection tool to inspect, and all blind pipes can be smoothly transferred into the inspection tool as qualified products.

2. The processing method of the all-glass double vacuum heat collecting tube type pressure-bearing enamel liner according to claim 1 is characterized in that: The specific structure of the pressure-bearing enamel inner liner comprises an inner liner middle tube (1), the right end of the inner liner middle tube (1) is provided with a flanged head (2), the left end of the inner liner middle tube (1) is provided with a flangeless head (3), the left side wall of the flangeless head (3) is fixedly provided with a PT valve pipe seat (4), the lower side wall of the inner liner middle tube (1) is provided with a magnesium rod hole seat (5), a magnesium rod (6) is arranged inside the magnesium rod hole seat (5), a hot water pipe (7) is arranged at the left end of the magnesium rod hole seat (5), and a cold water pipe (8) is arranged at the right end of the magnesium rod hole seat (5), and the inner liner middle tube (1) is provided with evenly arranged blind pipes (9), and the outer parts of the evenly arranged blind pipes (9) are coated with an enamel coating.

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