CN103836797B - A kind of double sandwich water heater liner and assembling technique thereof - Google Patents

Abstract

The invention relates to a double-interlayer water heater liner and an assembly process method thereof, belonging to the technical field of water heaters. The inner tank includes a water storage tank, a jacket and a heat conduction layer. The inner surface of the water storage tank has an enamel layer. The concave arc surface of the jacket extends out of the expansion edge. A row of assembly holes are respectively distributed on the expansion edges on both sides. The welding studs extending in the normal direction are welded on the surface, and the assembly holes extend along the direction of the angle with the busbar on the outer surface of the arc. After the welding studs pass through the corresponding assembly holes, the outer ends are screwed with nuts that hold the expansion side of the jacket . The invention properly solves the problem of damage-free combination of the double interlayer enamel liner, and effectively avoids damage to the enamel layer while ensuring that the double interlayer can be closely attached to the surface of the inner liner through the heat conduction layer after combination.

Description

A double-interlayer water heater liner and its assembly process method

technical field

The invention relates to a water heater liner, in particular to a double-layered water heater liner, and also relates to its assembly process, which belongs to the technical field of water heaters.

Background technique

The water heater liner with heat exchange interlayer is widely used due to its compact structure and good heat exchange effect. Its early typical structure, as disclosed in the Chinese utility model with application number 01261923.X, is a single sandwich type. Although there were some changes in the specific structure afterwards, none of them were substantial, especially welding was used to form the interlayer. However, for the enamel liner, the welding process will inevitably lead to "ceramic explosion" due to overheating, which seriously affects the anti-corrosion performance. For this reason, the Chinese invention patent application with the application number of 201210088691.6 discloses a water heater sandwich tank and its processing method: the first step is to weld two collars on the inner tank, and the maximum outer diameter of at least one collar is less than or equal to The inner diameter of the outer cylinder; the second step, enamel sintering the inner tank; the third step, sleeve the outer cylinder on the inner tank, expand the collar with the maximum outer diameter less than or equal to the diameter of the outer cylinder, and then It is welded together with the outer cylinder; the fourth step is to complete all the welding to form a sandwich water tank. Its disadvantage is that it makes the jacket structure more complicated, and hinders the foaming of the outer insulation layer.

In recent years, the impact of single-interlayer water heater liner on the safety of water sources has attracted great attention, because once the structure avoids perforation inside the interlayer due to corrosion and other reasons, the heat exchange medium in the interlayer will seep into the inner liner, which will inevitably pollute the water source.

In order to comply with the standards on ensuring the safety of water sources, a double-layered water heater liner has been released. Its typical structure is disclosed by the Chinese patent application number 201020694399.5, including a heat exchange jacket, an enamel liner and an outer shell. The outer shell is provided with a water inlet pipe and an outlet. The water pipe, the water inlet pipe and the water outlet pipe are connected with the enamel liner, the two ends of the shell are respectively installed with left and right covers, and the outer wall of the enamel liner is arranged with a heat exchange jacket, which is made of stainless steel plate. The inner wall surface of the heat jacket is a circular arc surface, and the inner wall surface of the heat exchange jacket is closely attached to the outer wall surface of the enamel liner through the interface material with good thermal conductivity.

Although the structure of this kind of double-interlayer water heater liner is obviously different from the single-layer structure, the combination of the interlayer and the inner liner cannot learn from the method of 201210088691.6, so it is still based on the traditional welding process, only the full welding that needs to be guaranteed to be sealed. Change to edge intermittent or spot welding with less heat. However, practice has proved that no matter whether intermittent welding or spot welding is used, local overheating at the welding place will still cause cracks in the enamel, which greatly weakens its anti-corrosion performance. Therefore, the damage-free combination of the double sandwich enamel liner becomes a technical problem.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned technical problems in the combination of the double-interlayer enamel liner, through the innovation of the process structure, to propose a method that can effectively avoid damage to the enamel layer and ensure that the double-layer interlayer is closely attached to the surface of the inner liner through the heat-conducting layer. The inner vessel of the double-interlayer water heater, and its assembly process method are given.

In order to achieve the above purpose, the double-interlayer water heater liner of the present invention includes a water storage tank with a circular arc outer surface, a jacket with a concave arc surface matching the shape of the circular arc outer surface, and a jacket located between the water storage tank and the clamp. The heat conduction layer between the sleeves, the inner surface of the water storage tank has an enamel layer, and the concave arc surface of the jacket extends at least towards both sides with expansion edges that can fit the outer surface of the arc, and the expansion edges on both sides A row of assembling holes are respectively distributed on the outer surface of the circular arc, and welding studs extending in the normal direction are welded and fixed on the outer surface of the arc corresponding to the positions of the assembling holes. Extending, the maximum distance between the two sides of the jacket relative to the assembly hole is greater than or equal to the distance between the welding studs on both sides of the corresponding arc outer surface away from the end of the water storage tank, and the minimum distance between the two sides of the jacket relative to the assembly hole is less than or equal to Corresponding to the distance between the welding studs on both sides of the outer surface of the arc adjacent to one end of the water storage tank, after the welding studs pass through the corresponding assembly holes, the outer ends are screwed with nuts that hold the expanding edge of the jacket.

The assembly process method of the double-layered water heater liner of the present invention comprises the following steps:

The first step is to weld and fix the welding studs extending in the normal direction on the outer cylindrical surface of the water storage tank with an enamel layer formed on the inner surface corresponding to the position of the assembly hole;

Step 2: After padding the heat conduction layer, insert the matching holes of the jacket into the corresponding welding studs;

The third step is to push the jacket toward the water storage tank body in the direction where the distance between the assembly holes on both sides becomes smaller, so that the concave arc surface of the jacket is close to the outer surface of the water storage tank body and press the heat conducting layer;

Step 4: Tighten the nut that presses the expansion side of the jacket at the outer end of the welding stud.

Since the heat of welding at the end of the welding stud is small, there is no damage to the enamel layer in the inner tank, and the above-mentioned assembly hole structure combined with the moving steps of the assembly process skillfully handles the obstacle caused by the gradual expansion of the welding stud spacing in the normal direction to the assembly. Therefore, after adopting the present invention, the problem of damage-free combination of the double sandwich enamel liner is properly solved, and the double sandwich layer can be closely attached to the surface of the liner through the heat conduction layer after combination, and the enamel layer is effectively avoided from being damaged.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

FIG. 1 is a schematic perspective view of the three-dimensional structure of Embodiment 1 of the present invention.

Fig. 2 is a schematic perspective view of the three-dimensional structure of the jacket in the embodiment of Fig. 1 .

Fig. 3 is a schematic plan view of the jacket in the embodiment of Fig. 1 .

Fig. 4 is a side view of the embodiment in Fig. 1 .

Fig. 5 is a schematic diagram of the assembly hole structure of Embodiment 2 of the present invention.

In the figure, there are: jacket 5, outer plate 5-1, bottom plate 5-2, expansion edge 5-3, assembly hole 5-4, water tank body 6, arc outer surface 6-1, welding stud 7, nut 8.

detailed description

Embodiment one

The inner tank of the double-layered water heater of this embodiment is shown in Figure 1, including a water storage tank body 6 with an arc outer surface 6-1 (not limited to the complete cylindrical outer surface of this embodiment), having a shape similar to the arc outer surface The jacket 5 matching the concave arc surface and the heat conduction layer between the water storage tank 6 and the jacket 5 . The inner surface of the water storage tank 6 is coated with an enamel layer. As shown in Figure 2, the jacket 5 is welded by an arc-shaped outer plate 5-1 made of stainless steel and a bottom plate 5-2 forming a concave arc surface, and the bottom plate 5-2 forming a concave arc surface faces at least two sides (not (Limited to the four sides) of this embodiment extends an expanded side 5-3 that can be attached to the outer surface of the arc. A row of assembly holes 5-4 are respectively distributed on the expansion sides 5-3 on both sides, and the position corresponding to the assembly holes 5-4 on the arc outer surface 6-1 is welded and fixed with the welding stud 7 extending in the normal direction (see "Arc Studs Cylindrical head welding studs for welding "GB/T10433-2002). The assembly hole 5-4 extends along a direction forming an angle of about 30° (not limited to this angle) with the generatrix of the arc outer surface 6-1, and the two ends are semicircular arcs matching the radius of the welding stud. The maximum distance S between the two sides of the jacket 5 relative to the assembly hole 5-4 is equal to (or greater than) the distance S' between the welding studs 7 on both sides of the corresponding arc outer surface 6-1 away from the end of the water storage tank body, and the two sides of the jacket 5 The minimum spacing s relative to the assembly hole 5-4 is equal to (or smaller than) the spacing s' between the welding studs 7 on both sides of the corresponding circular arc outer surface 6-1 adjacent to the end of the water storage tank, which is more conducive to positioning and limiting during assembly. bit. After the welding stud 7 passes through the corresponding assembly hole 5-4, the outer end is screwed with a nut 8 with a washer that presses the expanding edge 5-3 of the jacket.

When assembling, the outer cylindrical surface of the inner surface of the water tank with an enamel layer is first welded to the position corresponding to the assembly hole, and the welding studs extending in the normal direction are fixed, and the temperature rise of the enamel layer on the inner surface of the inner tank caused by the heat of the welding studs during welding is much larger. below its sintering temperature, thus ensuring that the enamel layer is not damaged. After that, place the heat conduction layer well, insert the fitting holes of the jacket into the outer ends of the corresponding welding studs from the large distance; As the body moves, the tendency of the spacing of the assembly holes to become smaller will make the concave arc surface of the jacket gradually approach the outer surface of the water tank body arc, until it reaches the extreme position of compressing the heat conducting layer. Finally, tighten the nut with washer that holds the expanded side of the collet on the outer end of the stud.

Practice has proved that the inner tank of the double-interlayer water heater in this embodiment has a simple structure, a practical process, and the installation and disassembly of the jacket is very convenient, and has no effect on the anti-corrosion performance of the enamel layer, and is very beneficial to subsequent processes such as foaming of the external insulation layer.

Embodiment two

The structure of the inner container of the double-layered water heater of this embodiment is basically the same as that of Embodiment 1, except that the assembly hole 5-4 is shown in Figure 5, and consists of a trapezoidal end and a rectangular side composition. Alternatively, on the basis of the first embodiment, the end of the assembly hole 5-4 with the smallest distance extends out of a straight section parallel to the generatrix of the arc outer surface 6-1. In this way, during the assembly process, when the jacket is moved toward the direction where the distance between the mounting holes on both sides becomes smaller, the interaction between the welding stud and the slope section’s hypotenuse will produce a component force that makes the interlayer close to the water storage tank, which is beneficial to both Tight fit; when the welding stud enters the straight edge section, the jacket can have a tendency to expand toward both sides, which is conducive to maintaining a certain degree of fit with a certain pre-tightening force and preventing springback.

Claims (6)

1. A double-layered water heater liner, comprising a water storage tank with a circular arc outer surface, a jacket with a concave arc surface matching the shape of the circular arc outer surface, and a jacket located between the water storage tank and the jacket The inner surface of the water storage tank has an enamel layer, which is characterized in that: the concave arc surface of the jacket extends at least towards both sides with expansion edges that can fit the outer surface of the arc, and the outer surfaces of the two sides A row of assembling holes are respectively distributed on the extended side, welding studs extending in the normal direction are welded on the outer surface of the arc corresponding to the positions of the assembling holes, and the assembling holes form an included angle with the generatrix of the outer surface of the arc The maximum distance between the two sides of the jacket relative to the assembly hole is greater than or equal to the distance between the welding studs on both sides of the corresponding arc outer surface away from the end of the water tank body, and the minimum distance between the two sides of the jacket relative to the assembly hole is less than Or equal to the distance between the welding studs on both sides of the corresponding arc outer surface adjacent to one end of the water storage tank. After the welding studs pass through the corresponding assembly holes, the outer ends are screwed with nuts that hold the expanding edge of the jacket. 2. The double-layer water heater liner according to claim 1, wherein the jacket is welded by a stainless steel arc-shaped outer plate and a bottom plate forming a concave arc surface. 3. The double-layer water heater liner according to claim 2, characterized in that: the two ends of the assembly hole are semicircular arcs matching the radius of the welding stud, and the maximum distance between the two sides of the jacket relative to the assembly holes is equal to the corresponding The distance between the welding studs on both sides of the arc outer surface away from the end of the water storage bladder, the minimum distance between the two sides of the jacket relative to the assembly holes is equal to the distance between the welding studs on both sides of the corresponding arc outer surface adjacent to the end of the water storage bladder. 4. The double-layered water heater liner according to claim 1, 2 or 3, characterized in that: the minimum distance end of the assembly hole extends a straight section parallel to the generatrix of the arc outer surface. 5. The assembly process method of the inner tank of the double-interlayer water heater according to claim 1, characterized in that it comprises the following steps: The first step is to weld and fix the welding studs extending in the normal direction on the outer cylindrical surface of the water storage tank with an enamel layer formed on the inner surface corresponding to the position of the assembly hole; Step 2: After padding the heat conduction layer, insert the matching holes of the jacket into the corresponding welding studs; The third step is to push the jacket toward the water storage tank body in the direction where the distance between the assembly holes on both sides becomes smaller, so that the concave arc surface of the jacket is close to the outer surface of the water storage tank body and press the heat conducting layer; Step 4: Tighten the nut that presses the expansion side of the jacket at the outer end of the welding stud. 6. According to claim 5, the method for assembling the inner tank of the double-interlayer water heater is characterized in that: the two ends of the assembly hole are semi-circular arcs matching the radius of the welding stud, and the maximum diameter of the opposite assembly hole on both sides of the jacket is The distance is equal to the distance between the welding studs on both sides of the corresponding arc outer surface away from the end of the water storage tank, and the minimum distance between the two sides of the jacket relative to the assembly holes is equal to the distance between the welding studs on both sides of the corresponding arc outer surface adjacent to the end of the water storage tank ; In the third step, the jacket is moved toward the direction in which the distance between the mounting holes on both sides becomes smaller relative to the water storage tank until it reaches the extreme position of compressing the heat-conducting layer.