RU2752444C1 - Convector profile - Google Patents

Abstract

FIELD: community heating systems.

SUBSTANCE: invention relates to the field of heating of buildings and structures for industrial and civil purposes, in particular to the convector profile. The convector profile includes a pipe for the passage of the coolant, external heat exchange panels and located between them T-shaped rib formed by the upper and lower shelves, and horizontal ribs with through holes made in them. The convector profile is made of aluminum or aluminum alloys. The external heat exchange panels are made at an angle to the inner cavity. The pipe has a finned inner surface and is connected to a vertical rib diametrically located to the T-shaped rib. The through holes in the horizontal ribs are made of rectangular shape.

EFFECT: increased intensity of heat exchange, simplification of the design and reduction of its overall dimensions, increase reliability, manufacturability and corrosion resistance.

4 cl, 2 dwg

Description

The invention relates to the field of heating buildings and structures for industrial and civil purposes, in particular to the profile of the convector.

The purpose of the heater is to transfer heat from the coolant to the air that fills the room. According to the method of heat transfer, heating devices are conventionally divided into radiators and convectors.

Radiators transfer heat both by radiation and convection. Their disadvantages are their large size, low operating pressure (up to 6 bar), a large volume of coolant and heating of nearby objects.

Convectors transfer heat primarily by convection. In addition, they require less heating medium to fill the system. The design of the convectors allows them to withstand higher network pressures (up to 30 bar).

The most common design of the convector is a pipe with ribs pressed onto it and has such disadvantages as unaesthetic appearance, contamination of the intercostal space.

Known profiles made of aluminum alloy by cold pressing (RF patents for utility model No. 109545 and No. 109546, IPC F28F 1/10), containing a pipe for the passage of the coolant and a heat dissipating element made in the form of two longitudinal walls located on opposite sides of the pipe, and longitudinal plates, radially located between the walls, two of which form a closed air channel with each longitudinal wall along the entire length of the wall, while the longitudinal walls are made: for the counter flow of the air coolant flat, and for the outflowing flow in the form of a concave arc, a combination of such the shape of the longitudinal walls creates the conditions for the transition of a part of the laminar motion of the incoming horizontal flow of the air coolant to the heat exchange profile into the outgoing vertical turbulent component of the flow around the profile, which has local strengthened zones of the ascending flow due to the geometry of the longitudinal walls, the concave arc of the longitudinal wall is bent with a radius catfish R = 2.8 ÷ 4.3⋅D, mm, where D is the chord length.

The presented profile designs in these patents have low efficiency, since for the flow of a horizontal / vertical (from top to bottom) air flow, forced blowing of the profile is required. The profile itself does not produce natural air convection, but is only calculated in such a way that turbulent flows swirl, providing heat / cold transfer from the pipe, which is filled with a coolant, to the air flowing past. This design is suitable for duct heater / refrigerant with electric fan installation - air heater / refrigeration unit / air conditioner. Devices of this type are installed in industrial facilities.

A sectional radiator made of extruded aluminum profiles is known (RF patent No. 2254521, IPC F24H 3/00, published on June 20, 2005), containing inlet and outlet manifolds made in the form of an asymmetric profile pipe with an offset channel and fixing by means of screws paired ears from the support side surfaces connected to them are vertical tubular axisymmetric sections with axial radial ribs, rear and front outer panels, while each collector is made with a displaced channel of a "beak" configuration in cross section and is equipped with a thickened trapezoidal support, the axisymmetrically located tubular channel of the section is a pipe with vertical heat-transfer fins, made radial axial, and intermediate symmetrically bent fins, on both sides of the section along the axial rib at a length equal to the thickness of the transverse side of the collector profile, a smooth pipe with two annular rings is pressed into the mounting holes of the collectors holes, in which the sealing rings are located, the axial rib at both ends of the channels is equipped with an elastic heat-resistant retainer, in addition, the radiator has fastening sections, and the rear panel of the fastening section with the thickened side of the collectors is secured mainly with self-tapping bolts acting as a rigid radiator screed screwed through mounting holes. Extruded aluminum profiles are made mainly of aluminum alloys, for example, an alloy consisting of the following components: Mg - 0.59%, Si - 0.39%, Fe - 0.19%, Cu - 0.3%, aluminum - 98.53 %

This model consists of many elements that require installation skills and are difficult to manufacture. The efficiency of heat transfer can be reduced by improper installation of the entire structure and with a high coefficient of stiffness of the coolant (saturation with minerals), internal connections can stick to each other, which creates the likelihood of corrosion, clogging of channels, and leakage.

Known section of the convector (RF patent for utility model No. 61397, IPC F24H 3/06, published on February 27, 2007), containing a heat exchange element having longitudinal side panels on the upper side turning into sections perpendicular to them inward with the formation of a longitudinal slot and located between the side panels ribs to increase the heat transfer area, including the main and additional ribs having a T-shaped profile, the horizontal component of which runs along the longitudinal slot with a gap relative to the inner surfaces of the shelves perpendicular to the side panels, characterized in that the section has at least two collectors for the passage of the coolant through the section, located at the lower base of the side panels from their inner side and conjugated with them, the main rib is located along the longitudinal axes of the collectors, connects them and is coupled with them, while through holes are made along the entire length of the main rib, the vertical component T -shaped the profile of the additional rib is connected to the main rib along its longitudinal axis, and the horizontal component is parallel to it.

The presented convector has two collector channels in the main profile. The design is bulky, since it contains a complex assembly for connecting the profiles to the general heating system, through the original support leg. The design drawback is that the support leg acts as a supporting element and at the same time as a loop collector, which can be very unreliable in operation. Also, the design allows only a single floor-standing version.

As the closest analogue, a convector for a water heating system and a convector section were selected (RF patent for utility model No. 53759, IPC F24H 3/06, published on May 27, 2006), consisting of at least two sections, each of which has a manifold for the passage of the coolant through the section and the heat exchange element having side panels and ribs located between them to increase the heat transfer area, installation elements, while the side panels are located along the longitudinal axis of the collector for the passage of the coolant through the section, the collector outlet of each previous section is connected to the collector inlet of the next section connecting manifold.

The presented convector is a one-piece structure, which is obtained from a profile by cutting the outer and inner ribs. The central element of the profile (collector) freed from the ribs is bent at an angle in such a way as to form two parallel profiles. Due to the fact that the design of the convector is one-piece, the support leg from the side of the protruding element (collector) is complex (consists of several elements bolted to each other). The design is difficult to manufacture. In addition, the likelihood of the appearance of microcracks in the bent element (collector) is not excluded, which can lead to unreliability of the structure and a decrease in operational characteristics, namely, a decrease in the resistance to pressure of the coolant, the expansion of microcracks from a temperature difference, and a decrease in corrosion resistance. The chosen method of looping the convector also limits the variations in the parallel placement of the profiles and excludes the possibility of repair and simple replacement of the convector section.

The technical object of the invention is to develop an easy-to-manufacture aluminum convector.

The technical result is to increase the intensity of heat exchange, simplify the structure and reduce its overall dimensions, increase the reliability, manufacturability and corrosion resistance.

The technical result is achieved in that the profile of the convector includes a pipe for the passage of the coolant, external heat exchange panels and a T-shaped rib located between them, formed by the upper and lower shelves, and horizontal ribs with through holes made in them, while the convector profile is made of aluminum or aluminum alloys, external heat exchange panels are made inclined to the inner cavity, the pipe has a ribbed inner surface and is connected to a vertical rib diametrically located to the T-shaped rib, while the through holes in the horizontal ribs are rectangular.

The invention is illustrated by the following drawings:

Fig. 1 is a convector profile.

Fig. 2 is a section of the convector.

The profile of the convector 1 (Fig. 1), made by extrusion from aluminum or aluminum alloys in the form of a single piece, includes a pipe 2 for the movement of the heat carrier (water). Pipe 2 (Fig. 1, 2) has a ribbed inner surface to increase the contact surface with the coolant. On the sides of the pipe 2 there are symmetrically located horizontal fins 3 located in a plane passing through the longitudinal axis of the collector and connecting the pipe 2 with the external heat exchange panels 4. The horizontal fins 3 allow to increase the heat transfer area. In this case, through the entire length of the horizontal ribs 3 at a given distance from each other made through rectangular holes 5 (Fig. 2), providing air movement.

External heat exchange panels 4 are located along the longitudinal axis of the pipe 2 and are formed by straight 6 and 7 inclined sections. In this case, the straight sections 6 protrude downward beyond the pipe 2 perpendicular to the horizontal ribs 3, and the inclined sections 7 of the external heat exchange panels 4 are made at an angle of 7-15 ° with an inclination to the inner cavity of the profile to increase the flow rate of heated air at the outlet of the convector. Inclined sections 7 in the upper part are rounded inward of the profile with the transition to the shelves 8 perpendicular to them with the formation of a longitudinal slot. The external heat exchange panels 4 also have technological thickenings 9, made in the straight 6 and the inclined 7 sections, to increase the strength of the structure.

To increase the heat transfer area along the entire length of the pipe 2, a T-shaped rib 10 and a vertical rib 11 are made along its axis.

The T-shaped rib 10 runs along the upper part of the pipe 2 along its entire length and is formed by the upper 12 and lower 13 shelves. In this case, the upper shelf 12 is horizontal and runs under the longitudinal slot formed by the shelves 8 of the external heat exchange panels 4 so that the width of the upper shelf 12 exceeds the width of the longitudinal slot to protect the inner surface of the convector from the penetration of foreign objects. On the lower shelf 13 of the T-shaped rib 10 there is a technological thickening 14 to increase the strength of the structure.

When the heat carrier (water) is heated in the pipe 2, the air entering the inner cavity of the convector is heated, formed by horizontal fins 3, external heat exchange panels 4, T-shaped fin 10 and vertical fin 11. Then the heated air passes through the gap formed by the shelves 8 and the upper shelf 12 of the T-shaped rib 10. Making the external heat exchange panels 4 inclined with respect to the horizontal ribs 3 allows to increase the flow rate of heated air at the outlet of the convector, and the T-shaped rib 10 protects the inner surface of the convector from foreign objects.

The absence of copper and silicon in the convector's composition improves corrosion resistance.

The declared design of the convector allows to increase the thermal power by 100 W / m in comparison with the closest analogue and to achieve a technological efficiency equal to 113 W / kg.

Claims (4)

1. Convector profile, including a pipe for the passage of the heat carrier, external heat exchange panels and a T-shaped rib located between them, formed by the upper and lower shelves, and horizontal ribs with through holes made in them, characterized in that the convector profile is made of aluminum or aluminum alloys, the external heat exchange panels are made oblique to the inner cavity, the pipe has a ribbed inner surface and is connected to a vertical rib diametrically located to the T-shaped rib, while the through holes in the horizontal ribs are rectangular. 2. Convector profile according to claim 1, characterized in that the external heat exchange panels are made at an inclination of 7-15 ° to the inner cavity of the section. 3. Convector profile according to claim 1, characterized in that there is a technological thickening on the lower shelf of the T-shaped rib. 4. Convector profile according to claim 1, characterized in that the pipe is made with longitudinal ribbing along its entire length.

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