RU2748369C1 - Removable heating element of heat exchangers - Google Patents

Abstract

FIELD: heat exchangers.

SUBSTANCE: removable heating element of heat exchangers consists of external 1 and submerged 7 cases, made in the form of hollow closed hemispheres. The inner volume of external case 1 is connected to inlet pipe 2 for the heating heat carrier and inlet ends 3 of the bundles of pipe coils with spirals 4 forming the walls of longitudinal channels having gaps 5 between the pipes of adjacent spirals. Output ends 6 of the bundles of pipe coils are connected to the inner volume of submerged case 7, from the central part of which pipe 8 exits, which passes inside the pipe coils and, through external case 1, goes to the surface of the removable element, forming outlet pipe 9 of the heating heat carrier. To install and attach a removable heating element to the heat exchanger case, flange 10 is located on the external case 1 along its outer diameter.

EFFECT: simplified maintenance and repair of heat exchange devices.

3 cl, 4 dwg

Description

This technical solution relates to heat engineering and can be used in heat exchangers and water-to-water heaters in heat supply and hot water supply systems for residential buildings and structures.

Known heat exchange element, consisting of inner and outer pipes, one of which is made in the form of a coil, channel adapters connected to both pipes (patent for invention RU 2125695, IPC F28D 7/10, F28F 1/00. Heat exchange element / authors: Kamensky V.G. (RU), Kamashev B.M. (RU), Rulev V.M. (RU); patent holder - Experimental Design Bureau of Mechanical Engineering (RU). Application No. 96113250/06, filed 04.07.1996; publ. 27.01.1999).

This heat exchange element is intended for marine nuclear steam generating plants and nuclear power plants with a pressurized water-water reactor. The element is difficult to manufacture and structurally cannot be used in water-to-water heaters in heat supply and hot water supply systems for residential buildings and structures.

Known heat exchanger containing a tubular system in the form of a coil, made in the form of a cylinder, with inlet and outlet pipes of the heating circuit (patent for invention RU 2701788. IPC F28D 7/026, F28G 13/00. Heat exchanger / authors: Levtsev A.P. ( RU), Verendyaykin G.G. (RU), Liu Junchen (RU); patent holder - Federal State Budgetary Educational Institution of Higher Education "Central Research Mordovian State University named after N.P. Ogarev" (RU). 05/31/2019; publ. 10/01/2019, bull. No. 28).

The disadvantages of this heat exchanger are the low heat transfer coefficient due to the only tubular system in the coil, as well as the impossibility of autonomous use of the coil as a replaceable element of heat exchangers.

The closest to the claimed technical solution is a shell-and-tube coil heat exchanger containing bundles of tube coils with turns forming the walls of longitudinal channels having gaps between pipes of adjacent turns (patent for invention RU 2036406, IPC F28D 7/02. Shell-and-tube coil heat exchanger / authors: Sudarev A .V. (RU), Sudarev B.V. (RU), Sudarev V.B. (RU), Kondratyev A.A. (RU), Tsurikov A.V. (RU); patent holder - Research and Production Enterprise " Tark "(RU). No. 93009729/06; filed. 02.24.1993; publ. 05.27.1995).

This device was chosen as a prototype.

The disadvantages of this heat exchanger are the complexity of the manufacture of bundles of tube coils, as well as the impossibility of autonomous use of bundles of tube coils as a replaceable element of heat exchangers.

The aim of the present invention is to eliminate these disadvantages.

This goal is achieved by the fact that in the removable heating element of the heat exchanger, consisting of bundles of tube coils with turns forming the walls of longitudinal channels with gaps between the pipes of adjacent turns, the outer and submersible bodies are introduced, made in the form of hollow closed hemispheres, in which the inner volume of the outer the body is connected to the inlet ends of the bundles of pipe coils and the inlet pipe of the heating element, and the internal volume of the submerged body is connected to the outlet ends of the bundles of pipe coils and the outlet pipe, which leaves the center of the submerged body, passes inside the pipe coils and, through the outer body, goes to the surface of a removable element forming an outlet pipe, while the outer casing along the outer diameter contains a flange for installing and fixing a removable heating element in a heat exchanger, and bundles of pipe coils are made of corrugated stainless pipes.

The proposed technical solution has novelty, inventive step and industrial applicability, i.e. all the criteria of the invention.

The novelty and inventive step are confirmed by patent research, and industrial applicability is due to the fact that the claimed removable heating element can be used in the manufacture of any water-to-water heat exchangers.

The essence of the invention is illustrated in the drawings (Fig. 1 - Fig. 4), where Fig. 1 shows a general view of a removable heating element of heat exchangers, FIG. 2 shows a general view of a removable heating element of heat exchangers in longitudinal section, FIG. 3 shows a sectional view of a removable heating element of heat exchangers in plane A-A, and FIG. 4 shows an example of using a removable heating element in heat exchangers.

The removable heating element of the heat exchangers consists of an outer casing 1 made in the form of a hollow closed hemisphere, from the upper part of which there is an inlet pipe 2 for the heating coolant. The inner volume of the outer casing 1 is connected to the inlet ends 3 of bundles of tube coils with coils 4 forming the walls of longitudinal channels having gaps 5 between the pipes of adjacent coils. The outlet ends 6 of the bundles of pipe coils are connected to the inner volume of the submerged body 7, made in the form of a hollow closed hemisphere, from the central part of which pipe 8 comes out, passes inside the pipe coils and, through the outer body 1, goes to the surface of the removable element, forming an outlet pipe 9 heating coolant. For installation and fastening of a removable heating element in the body of heat exchangers on the outer casing 1, flange 10 is contained along its outer diameter.

The number of pipe coils 3 in the removable heating element and the size of the gap 5 between the pipes of adjacent turns can be different and is determined by the required heat transfer coefficient in the heat exchanger used. FIG. 3, as an example, a variant is shown using four tube coils in a heating element.

FIG. 4 shows a variant of the design of a heat exchanger using a removable heating element.

The removable heating element is attached to the heat exchanger body 11 by means of the flange 10 through the sealing gasket 12 and securely fixed with bolts 13. The heated water enters the heat exchanger body 11 through the pipe 14 and, after heating, enters the consumer through the pipe 15. Heating water is supplied to the removable heating element through branch pipe 2 and, after heat transfer in a bundle of tube coils, leaves the heating element through branch pipe 9.

In the claimed removable heating element, the tube coil bundles are made of corrugated stainless steel tubes, which significantly increases the effective heat exchange surface compared to smooth copper or brass tubes. According to the data from the article "Corrugated stainless steel pipe" (email address - Corrugated stainless steel pipe | (domidei.ru> node / 687 ∨), the heat exchange surface of corrugated stainless steel pipes is 40% higher than that of copper pipes of a similar diameter, and the smaller wall thickness of corrugated stainless pipes compared to copper pipes compensates for the difference in their thermal conductivity.

In addition, corrugated corrugated pipes are durable, have increased strength and ductility, and are resistant to corrosion processes. Having a minimum roughness coefficient, they do not overgrow or silt up, which eliminates the need for periodic cleaning.

This is especially important in the real conditions of operation of heat exchangers for preparing hot water in multi-storey residential buildings. The quality of the source water (tap), as a rule, leaves much to be desired. For this reason, operating services are forced to carry out regular labor-intensive work on cleaning heat exchangers in conditions that are poorly adapted for their implementation (basements of residential buildings). In addition, specially trained, highly qualified personnel are required to carry out these works.

When using a removable heating element, it can be easily removed from the heat exchanger housing and, if necessary, replaced with a new one. As practice has shown, the operation to replace one heating element takes no more than 30 minutes and is performed by a low-skilled specialist. The dismantled heating element is sent for maintenance in stationary conditions.

Claims (3)

1. A removable heating element of heat exchangers, consisting of bundles of tube coils with turns forming the walls of longitudinal channels having gaps between the pipes of adjacent turns, characterized in that the outer and submersible bodies are introduced, the inner volume of the outer body is connected to the inlet ends of the tube coil bundles and the inlet pipe of the heating element, and the internal volume of the submersible body is connected to the outlet ends of the bundles of pipe coils and a pipe that emerges from the center of the submerged body, passes inside the pipe coils and, through the outer body, goes to the surface of the removable element, forming an outlet pipe, while the outer body on the outer diameter contains a flange for mounting and fixing a removable heating element in a heat exchanger. 2. The removable heating element of heat exchangers according to claim 1, characterized in that the outer and submerged bodies are made in the form of hollow closed hemispheres. 3. Removable heating element of heat exchangers according to claim 1, characterized in that the bundles of tube coils are made of corrugated stainless steel tubes.

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