RU2294503C1 - Multi-sectional heat exchanger - Google Patents

Abstract

FIELD: heat power engineering.

SUBSTANCE: multi-sectional heat exchanger comprises sections made of at least two rectilinear pipes whose ends are provided with collectors which are interconnected in series through a tube bend. Each section is made of a set of pipes with piping collectors. The sections are parallel one to the other. The area of the cross-section of the bend tube is no less than that of the collector pipes.

EFFECT: reduced hydraulic drag and enhanced efficiency of heat exchanger.

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Description

The invention relates to heat exchangers designed to heat the fluid flowing inside the heat exchanger in a stream of hot gases, but can be used in other devices for heating and cooling a gas or liquid.

Known multi-tube collapsible heat exchanger made of several bundles of direct cooling pipes, and each tube of the bundle is connected in series with the corresponding tube of the neighboring bundle using a tubular elbow (see the description of the invention to the auth. St. USSR No. 85159, MKI 178, 502). With this design, in the case of a large number of tubes in the bundle, soldering or welding of tubular elbows with a flange becomes difficult.

A heat exchanger (prototype) is known, including bundles of at least two straight pipes, at the ends of which collectors are installed that are connected in series using a tubular elbow (see utility model No. 2861, IPC6 F 28 F 1/00).

With this design of the heat exchanger, when the fluid moves from the tubes to the collector, from the collector to the tubular elbow, and so on, sequential expansion occurs, then narrowing, again expanding the fluid flow, which leads to an increase in the hydraulic resistance of the heat exchanger and from a constantly changing speed of the fluid inside the fluid to a decrease thermal efficiency of the heat exchanger.

The present invention solves the problem of reducing the hydraulic resistance of the heat exchanger, aligning the fluid velocities in the heat exchanger, which leads to an increase in the thermal efficiency of the heat exchanger.

To achieve such a technical result in the proposed multi-section heat exchanger containing sections of at least two straight pipes, at the ends of which collectors are installed that are connected in series with a tubular elbow, it is new that each section is made in the form of a series of pipes with tubular collectors, sections are parallel to each other, and tubular elbows are made of pipes, the cross-sectional area of which is not less than the cross-sectional area of the collector pipes, and are located diagonal of each section.

The execution of the section collectors by tubular and connecting them by tubular elbows, the cross-sectional area of which is not less than the cross-sectional area of the collector pipes, as well as the location of the elbows along the diagonals of each section, provides the least hydraulic resistance of the fluid inside the heat exchanger and speed equalization in the pipes of the sections, and, consequently, the maximum thermal efficiency of the heat exchanger . The parallel arrangement of the sections provides effective heat removal with large flows of hot gases flowing around the heat exchanger tubes.

The proposed multi-section heat exchanger is illustrated by the drawings shown in figures 1-3.

Figure 1 shows a General view of the heat exchanger.

Figure 2 shows a top view of figure 1

Figure 3 shows a view of "A" in figure 1, the connection of the elbow to the manifolds.

A multi-section heat exchanger consists of sections 1, each section 1 consists of several straight pipes 2 (at least two pipes). At the ends of the pipes 2, tubular collectors 3 are installed. Each collector on one side has a plug 4. The collectors 3 of each section 1 are connected in series using the elbows 5. The elbows 5 are located diagonally B-B of each section 1. Sections 1 are parallel to each other. The cross-sectional area S _{1 of the} manifold pipes 3 is not less than the cross-sectional area S _{2 of the} elbow pipes 5. The pipes, manifolds, elbows, plugs are made of copper and brazed together.

The heat exchanger operates as follows.

The heat exchanger is placed in a stream of hot gases. Liquid flows through the heat exchanger, for example, water, after entering the collector 3, it spreads through the collector and enters the pipes 2. From the pipes 2 it enters the collector of the same section again and further along the elbow 5 it enters the collector 3 of the next section and so on. Due to the fact that the cross-sectional area of the knees 5 is not less than the cross-sectional area of the collectors 3, there is no difference in the velocity of fluid flow from the collector to the knee and again to the collector of the next section. Therefore, the hydraulic resistance of the heat exchanger is small. The liquid passing through the heat exchanger is effectively heated in a stream of hot gases passing sequentially between the pipes 2 of the parallel sections 1. Due to the fact that the elbows 5 are placed diagonally in each section 1, the liquid inside each section passes the longest path, also has minimal hydraulic resistance and is efficient heats up. The heat exchanger can be made of steel, and the connections can be made by welding.

Claims (1)

A multi-section heat exchanger comprising sections of at least two straight pipes, at the ends of which collectors are installed that are connected in series by a tubular elbow, characterized in that each section is made in the form of a series of pipes with tubular collectors, the sections are parallel to each other, tubular elbows are made of pipes, the cross-sectional area of which is not less than the cross-sectional area of the manifold pipes, and are located diagonally in each section.

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