RU2369818C1 - Turbulising unit for heat exchanging pipe - Google Patents

Abstract

FIELD: heat engineering.

SUBSTANCE: invention relates to heat engineering, namely to the turbulising unit design and can be used in different heat exchanging pipes of industrial heat exchangers. The turbulising unit for a heat exchanging pipe comprises swirling blades which are streamlined by the heat carrier flow and are rigidly fixed on the axis with the specified interval, the axis is made as two intertwisted rods and the swirling blades are made as rectangular plates mounted between the twisted rods and set along the pipe length with the interval of 0.5-5 inner pipe diametres. The twisting value changes the rotation angle of the plate plane in respect to the heat carrier flow by 1-15 grad and the rotation angle of the swirling blades in respect to each other by 15-90 grad.

EFFECT: optimal intensification of heat exchange in the heat exchanging pipes with different operation modes is achieved during a short period of time and without great expenditures.

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Description

The invention relates to the field of heat engineering, namely to the design of turbulizing devices, and can be used in various heat transfer pipes of industrial heat exchangers.

A turbulizing device for a heat exchanger pipe is known (JP No. 2976538, class F28F 1/40, 1999), which is an element with a spiral ridge forming a heat carrier flow. A channel for the passage of coolant is formed between the cylindrical section of the element and the inner wall of the heat transfer pipe, while the flow of coolant has a swirling motion.

A known turbulator for a heat exchanger pipe (US No. 5497824, class F28F 13/02, publ. 1996), comprising a double strip coiled into a spiral, wherein the turbulator is mounted coaxially inside the pipe of the heat exchanger so that it contacts the pipe walls or is removed from the inside wall surface.

A turbulizing device for a heat exchange tube is known (SU No. 624104, class F28F 13/12, 1978), comprising swirls with blades in pairs and rotatably mounted along the pipe on a fixed axis, while the blades are rotated by an angle of 40-60 ° relative to their axis of symmetry and placed in a pipe with a gap equal to (0.03-0.1) L, the distance between the swirls in each pair is (1.0-1.5) L, while the pairs are located one from another at a distance of (30-70 ) L, where L is the maximum size of the swirls in the plan.

The disadvantages of these methods is the low manufacturability in the manufacture, as well as the inability to achieve optimal performance when changing operating modes of heat exchangers, in particular the flow rate of the coolant.

Closest to the claimed invention is a turbulizing device for a heat exchanger pipe (SU No. 966482, class F28F 13/12, 1982), comprising an axis rotatable and rigidly mounted swirls with blades mounted on an axis with a given pitch, while the blades , through one, are inclined at different angles to the axis, and for the remaining swirlers the angle of inclination of all blades is the same and is 30-50 °. The swirlers are mounted on the axis with a step equal to 5-8 internal pipe diameters.

The disadvantages of this device are the low manufacturability, the inability to achieve the optimal operation of the same turbulizing device for the heat exchange pipe when changing the flow regimes of the heat carrier inside the pipe, the laborious and quite lengthy process of reconfiguring the equipment for a specific operating mode of the heat exchanger.

The technical task of the invention is to achieve optimal intensification of heat transfer in heat transfer pipes with various modes of operation for a short period and without significant costs.

The problem is solved in that a turbulizing device for a heat transfer pipe, comprising swirl-blades fixed on an axis with a given step, streamlined by a heat-transfer medium, the axis being made in the form of two rods twisted together, and swirl-blades made in the form of rectangular plates fixed between twisted rods and installed along the length of the pipe at a distance of 0.5 to 5 internal diameters of the pipe, and the magnitude of the twist changes the angle of rotation of the plane of the plates relative to the flow of heat ator an angle 1-15 °, and the rotation angle swirlers-blades relative to each other at 15-90 °.

The invention is illustrated in more detail by the drawing and description thereof.

Figure 1 schematically shows a turbulizing device containing the axis 1 in the form of two twisted rods, swirl-blades 2, which are rectangular plates mounted between twisted rods. The turbulizing device is located in the heat exchange tube 3.

Turbulent device operates as follows.

The coolant flow enters the pipe 3, flows onto the swirl-blades located inside the pipe in the form of rectangular metal plates 2, which are fixed by the central (middle) part between the twisted metal rods (axis) 1, and the plates can be held by the rods pressing them on both sides or attached to one of the rods by welding or soldering. Swirls are installed along the length of the pipe at a distance of 0.5 to 5 internal diameters of the pipe (the distance between the plates in the specified range can be the same or different). The plane of the swirl-blades (plates) is parallel to the flow of coolant. When the twisting forces of the rods change relative to each other, for example, when the amount of twisting increases, the plane of the plates (vortex-blades) is shifted by an angle of 1-15 ° relative to the flow of coolant (the plates unfold), while the plates rotate relative to each other by an angle of 15-90 ° . The intensification of the heat exchange process.

When the coolant flow hits the swirl-blades, it turbulizes, heat transfer improves, and hydraulic losses increase at the same time. The heat carrier with the same heat exchanger design can have various parameters (temperature, viscosity, pressure, etc.) and flow rate. The use of the claimed turbulizing device allows you to generate a flow of coolant with the most optimal combination between the amount of heat transfer and hydraulic losses when changing the flow mode of the coolant. This is achieved by simply changing the value of the twist of the rods relative to each other and, thereby, changing the angle of rotation of the plane of the plates (swirl-blades) relative to each other and relative to the flow of coolant.

The twisting of the rods and changing its magnitude can be performed using various devices, for example, using two clamps clamping the ends of the rods, by turning one of the clamps at a predetermined angle, taking into account the elasticity of the material from which the rods are made. The choice of material from which the rods and turbulators are made is determined by the specific operating conditions of the heat exchanger.

Thus, the proposed turbulizing device for a heat exchanger pipe can be used in heat exchangers with various parameters and flow rates.

Claims (1)

A turbulizing device for a heat exchanger pipe containing swirl-blades fixed on an axis with a predetermined pitch, streamlined by a coolant flow, characterized in that the axis is made in the form of two twisted rods, the swirl-blades are made in the form of rectangular plates fixed between twisted rods and installed along the length of the pipe at a distance of 0.5 to 5 internal diameters of the pipe, and the amount of twist changes the angle of rotation of the plane of the plates relative to the flow of coolant by an angle of 1-15 °, and the angle rotation of the swirl-blades relative to each other by 15-90 °.

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