RU2829249C1 - Boiler - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: boiler relates to water heaters, in which heating is carried out by heat carrier of heating system when internal tank is washed along its external walls, thereby heating water in internal tank. Boiler comprises an external tank in the form of a cylindrical shell with heating liquid inlet and outlet nozzles, external heat insulation, inner tank having walls with wavy profile, heated water inlet and outlet branch pipes installed in neck with flanged edge, which is welded in upper bottom of inner tank, external tank is welded to neck with circular seam.

EFFECT: increased area of heat exchange.

1 cl, 1 dwg

Description

The boiler is a water heater in which heating is carried out by the heating system coolant when washing the inner tank along its outer walls, thereby heating the water in the inner tank.

A design of an indirect heating boiler is known (patent No. 181948, published on July 30, 2018) containing an inner tank made of stainless steel with inlet and outlet pipes for heated water, which is rigidly fixed in an outer tank with inlet and outlet pipes for heating liquid, thermal insulation. In this case, the outer tank is connected to the inner tank by a welded joint of the walls along the entire length of the inner tank circumference at the junction of the shell and the bottom.

The known design is not efficient enough, as it has a smaller heat exchange area. The upper bottom of the inner tank is not involved in the heat exchange process, thus the heating of sanitary water is 30% slower.

The technical result consists in increasing the heat exchange area.

The technical result is achieved in that the boiler contains an external tank in the form of a cylindrical shell with inlet and outlet pipes for heating liquid, external thermal insulation, an internal tank having walls with a wavy profile, inlet and outlet pipes for heated water installed in a neck with a flanged edge, which is welded to the upper bottom of the internal tank, and the external tank is welded to the neck with a ring seam.

The boiler contains a cold sanitary water inlet 1, a tube 2 for a temperature sensor 3, a hot sanitary water outlet 4, a heating liquid inlet 5, a heating liquid outlet 6, an internal tank 7 with a neck, an external tank 8, polyurethane thermal insulation 9, a decorative cover 10, an inspection flange with a seal 11.

The water supply and discharge tubes pass through the neck of the inner tank with a flange.

The inner tank 7 made of stainless steel is suspended by a cantilever and secured with a circumferential weld to the neck, which ensures the reliability of the inner tank fastening.

The neck of the inner tank is made reinforced with a flanged edge. The neck is welded to the inner tank 7 in the upper bottom, then the outer tank 8 is welded with a ring seam for the free section of the neck. Thus, the inner tank 7 is securely fixed inside the outer tank 8 due to the reinforced neck and the flow of heating liquid along the upper surface of the inner tank 7 is ensured.

To ensure resistance to compression, the inner tank 7 has walls with a wave-shaped profile.

The use of an inspection flange 11 with a seal in the design makes it possible to inspect and clean the boiler from scale that forms over the years, due to which the heat exchange characteristics between the heating medium circuit and the sanitary water of the internal tank are reduced.

The boiler design has a larger heat exchange area with the upper bottom of the inner tank 7 involved in the heat exchange process, thereby heating the sanitary water faster.

The boiler works as follows.

The outer tank 8 is filled with the heating system coolant, which washes the inner tank 7 with sanitary water and heats it.

Pipes 1 and 4 for the cold water inlet and hot water recirculation ensure laminar mixing of the incoming cold water and the recirculated water returning to the internal tank 7.

Due to the variable pressure and temperature (depending on the intensity of use), the walls of the inner tank 7, which have a wave-like profile, ensure “shaking” of the deposited scale through cycles of extension and compression of the tank.

The tank 7 is made of stainless steel AISI 304, and the cylindrical shell of the outer tank 8 is made of carbon steel (for example 09G2S) or stainless steel, which ensures reliable operation of the boiler. Low corrosion activity of the coolant in the building heating system allows the use of carbon steels in the material of the outer jacket, which in turn reduces the cost of the boiler.

Claims (1)

A boiler containing an outer tank in the form of a cylindrical shell with inlet and outlet pipes for heating liquid, outer thermal insulation, an inner tank having walls with a wave-shaped profile, inlet and outlet pipes for heated water installed in a neck that is welded to the upper bottom of the inner tank, and the outer tank is welded to the neck with a ring seam.