RU2746908C1 - Connecting element of the register pipe with the collector in the heating radiator and the method of assembling the radiator using it - Google Patents

Abstract

FIELD: heating technology.SUBSTANCE: group of inventions relates to heating technology, namely to the designs of water heating radiators and methods of their assembly, and can be used in technological processes of mass production of heating radiators made using aluminum pipes. The connecting element of the register pipe with a manifold in the heating radiator is made in the form of a fitting containing a conical and cylindrical part, the outer diameter of the cylindrical part is less than the larger outer diameter of the conical part, the outer surface of the cylindrical part is threaded, and the inner channel has a figured cross-section, and the figure formed by the transverse section of the inner channel, has a rotational symmetry of the order of n≥3 relative to the central longitudinal axis of the channel.EFFECT: technical result is to ensure high tightness and mechanical strength of the joints of the radiator elements, the manufacturability of its assembly and the possibility of manufacturing radiators of great height.3 cl, 4 dwg

Description

The group of inventions relates to heating equipment, namely to the designs of water heating radiators and methods of their assembly, and can be used in technological processes of mass production of heating radiators made using aluminum pipes of various profiles.

One of the problems in the production of aluminum radiators for water heating, consisting of separate elements, is to ensure tightness and mechanical strength at the joints of such elements during assembly and subsequent operation.

A known method of connecting radiator collectors with tubes of vertical columns (see patent RU No. 2646181, IPC B23K11 / 02, B23K31 / 02, B23K33 / 00, F28F9 / 26, publ. 03/01/2018), including the execution of manufacturing operations in the walls of tubular collectors of holes with collars located around them and a rigid connection of the ends of the column tubes with collector collars, and each hole in each collector is made with a diameter smaller than the inner diameter of the collar, then, by plastic deformation, the collector walls are squeezed into the collector around each hole, a collar located in the cavity of the collector , at the same time, during the manufacture of the collar, a hole is made on the outer surface of the collector around the hole of the collector, then rings made of solder are put on the ends of each tube and the ends of each tube are inserted into the collars of the collectors until each solder ring stops into the surface of the collector hole, after which the tubes are rigidly connected by soldering count Onok with collector collars by heating the contact surfaces of the collector and the tube in the inductor in the area of the solder ring.

The known method does not provide a stable tightness of the joint, since when heated, the solder and the surfaces of the elements to be joined simultaneously have different physicochemical parameters at different points of the circle. In addition, during the soldering process, geometric displacements of the column tube relative to the collector are possible.

Known methods of connecting pipe headers with register pipes using connecting elements (see, for example, patents RU # #: 183359, IPC F28F9 / 26, F24H3 / 08, publ. 19.09.2018; 2486414, IPC F24H3 / 08, F28F9 / 26, F16L13 / 14, publ. 06/27/2013), where fittings with conical and cylindrical parts are used as connecting elements, and the connection is made by installing the cylindrical part of the fitting in the hole of the pipe manifold, followed by its flaring inside the manifold, and pressing by fitting the register pipe onto the conical part of the fitting.

The known technical solutions also do not provide high tightness of the joints (even taking into account the application of sealant to the outer surfaces of the connecting elements), due to the fact that it is practically difficult to achieve the same density of adhesion of the flared wall of the nozzle to the inner surface of the manifold.

Known adopted as the closest analogue heating radiator-convector and the method of fixing the register pipe in the hole of its tubular collector (see patent RU No. 2385442, IPC F24H3 / 08, F28F9 / 26, publ. 03/27/2010), in which each connecting the element is made in the form of a fitting having a conical and cylindrical parts, on the outer surfaces of which there is at least one annular groove, in the place of transition of the cylindrical part into a conical one a collar is made, located between the end of the register pipe and the collector, and the sealing element is made in the form of a transition cone pressed into the edge of the inlet opening of the collector, conjugated with the flat annular surface of the collar and the cylindrical surface of the fitting, the protruding end of which is flared by means of access from the side of the conical part of the fitting.

The method of fixing the register pipe in the opening of the tubular collector of the heating radiator-convector by means of such a connecting element includes releasing one end of it inside the collector and its elastoplastic expansion, and the inner channel of the fitting in the zone of the outlet of its end into the collector cavity is sharply narrowed, the plastic expansion is performed by pushing the working punch along the inner channel of the fitting from the side of its conical part until the punch falls out into the collector cavity, and the working punch is removed from the collector cavity by pouring out.

The known technical solution provides sufficient tightness of the connection between the collector and the register pipe, however, the design of the connecting element is difficult to manufacture. In addition, fixing the connecting element in the manifold by expanding its cylindrical part does not provide sufficient mechanical strength for press fit of the register pipe with a height of more than 1200 mm, which limits the range of radiators that can be manufactured using the known method and the connecting element.

The technical results of the claimed group of inventions are the provision of high tightness and mechanical strength of the joints of the radiator elements, the manufacturability of its assembly and the possibility of manufacturing radiators of great height and various geometric shapes.

The technical results are achieved due to the fact that in the connecting element of the register pipe with a manifold in the heating radiator, made in the form of a fitting containing a conical and cylindrical part, the outer diameter of the cylindrical part is less than the larger outer diameter of the conical part, the outer surface of the cylindrical part is threaded, and the inner the channel has a figured cross-section, and the figure formed by the cross-section of the inner channel has a rotational symmetry of the order of n≥3 relative to the central longitudinal axis of the channel.

Technical results are also achieved due to the fact that the method of assembling the radiator contains the following sequence of actions:

- installation of connecting elements in the upper and lower pipe headers, by screwing them into holes in them containing a corresponding internal thread, until the end surface of the conical part of the connecting element located on the side of its cylindrical part, with the surface of the face of the pipe header, and subsequent tightening with given effort;

- conjugation of the holes, made with a reverse taper, of the internal channels of each of the register pipes with the conical part of the corresponding connecting element of the upper and lower pipe manifold;

- simultaneous pressing from both sides of the conical parts of the connecting elements of the upper and lower collectors into the conical holes of the internal channels of the register pipes with a given force.

In addition, before installing the connecting elements in the upper and lower pipe collectors, it is possible to apply an adhesive composition to the outer surface of their cylindrical part.

The claimed technical solution is illustrated by drawings, where figure 1 shows a schematic representation of a connecting element (side view), figure 2 is a schematic view of a connecting element (top view), figure 3 is a schematic representation of the assembly stage (after pairing), Fig. 4 is a schematic representation of the assembly step (after crimping).

The explanatory drawings show the following radiator elements: a connecting element 1 containing a conical part 2, a cylindrical part 3 with a thread 4 on the outer surface, and an internal channel 5 with a figured section 6, upper and lower pipe headers 7 with threaded holes 8, register pipes 9 with internal channels 10 with holes 11 with reverse taper.

Presented in the text of this application, certain terms have the following meanings:

- "rotary symmetry" - a type of symmetry in which the figure of rotation constantly transforms into itself when rotating around the axis at a certain angle equal to 360 / n, where n is an integer greater than 1;

- "reverse taper" - a decrease in the diameter of the hole in the direction from the surface inward.

The implementation of the method for assembling a radiator using the inventive connecting element is as follows.

Preliminarily, on different technological lines, assembly elements of a heating radiator are produced: pipe collector 7, register pipe 9, connecting element 1.

In this case, on the basis of the selected size of the radiator, the pipe collector blank is cut from the extruded aluminum profile pipe. Further, in any of the 4 faces of the obtained billet of the pipe collector 7, holes 8 are drilled in a given number and a given diameter. It should be borne in mind that in cases of using a profile pipe with a cross section other than rectangular (for example, oval), on its surface in the places of drilling holes, it is necessary to form flat areas lying in the same plane.

In the holes 8 obtained, a metric thread is cut corresponding to the thread 4 on the connecting elements 1. Subsequent operations to prepare the pipe header are not related to the method of assembling the radiator and are not specified in the text of the application.

Pipes 9 of the register are also cut from an aluminum pipe, with a length corresponding to the selected size of the radiator, after which a reverse taper is formed in the openings 11 of the internal channels 10 in the blanks, corresponding in shape and size to the conical part 2 of the connecting elements 1.

The connecting element 1 is made by turning, after which it can be heat-treated to increase its strength.

The radiator is assembled directly in the following order.

In particular cases of implementation on the outer surface of the cylindrical part 3 of the connecting element 1 containing the thread 4, an adhesive composition is applied to form an additional seal of the joint. The applicant used LOCTAITE products as such a composition, which does not exclude the use of any other adhesives from different manufacturers.

The installation of connecting elements 1 in the holes 8 of the upper and lower pipe collectors 7 is carried out using a drilling tool (for example, bolt drivers) equipped with a special nozzle corresponding in size and shape to the figured section 6 of the inner channel 5 of the connecting element 1, screwing the cylindrical part 3 into the hole 8 until the end surface of the conical part 2 of the connecting element 1, located on the side of its cylindrical part 3, is mated with the face surface of the pipe manifold 7. Next, the final tightening is performed with an applied force of 5 N * m. The use of a threaded connection when installing in the pipe manifold 7 of the connecting elements 1 provides a much higher fit accuracy (alignment, geometric position), fixing strength, tightness and manufacturability than installation using flaring.

The execution of the internal channel 5 with a figured cross-section 6, having a rotary symmetry of the order of n≥3 relative to the central longitudinal axis of the channel, acting as a slot, makes it possible to screw in the connecting element 1 without mechanical damage to the outer surface of its conical part 2 using a special tool.

In this case, the cross-section 6 can have the shape of a regular triangle, square, regular hexagon, torx, etc. In the general case, the torx shape provides the possibility of a higher tightening force without the likelihood of mechanical damage to the connecting element 1 (relative to a regular triangle and a square - a large wall thickness with an equal cross-sectional area, relative to regular polyhedrons - a lower probability of "cutting" the splines).

After installing the connecting elements 1 in the holes 8 of the pipe collectors 7, the collectors 7 are connected to the register pipes 9.

To do this, each pipe 9 of the register, with one of its holes 11 with a reverse taper, is mated with the conical part 2 of the corresponding connecting element 1 of the lower collector 7, and the other with the conical part 2 of the corresponding connecting element 1 of the upper pipe collector 7, after which pressing is performed on both sides of the conical parts 2 of the connecting elements 1 of the upper and lower collectors 7 into the holes 11 of the internal channels 10 of the pipes 9 of the register with a pressure of 50 tons.

The conical surfaces 2 of the connecting elements 1 enter the holes 11 with a reverse taper and, due to the frictional forces, are heated to a plastic temperature of the order of 470-500 ° C. At the same time, friction welding of aluminum occurs in the zone of their connection, thus ensuring tightness and high mechanical strength of these units.

The claimed technical solution is high-tech, ensures reliable tightness of the radiator connection units, and makes it possible to manufacture heating radiators with a large heat transfer surface area and a high convection rate of the heat flux.

Claims (6)

1. A connecting element of a register pipe with a manifold in a heating radiator, made in the form of a fitting containing a conical and a cylindrical part, characterized in that the outer diameter of the cylindrical part is less than the larger outer diameter of the conical part, the outer surface of the cylindrical part is threaded, and the inner channel has a figured cross-section, and the figure formed by the cross-section of the inner channel has a rotational symmetry of the order of n≥3 relative to the central longitudinal axis of the channel. 2. A method for assembling a radiator, containing the following sequence of actions: - installation of connecting elements in the upper and lower pipe headers, by screwing them into holes in them containing a corresponding internal thread, until the end surface of the conical part of the connecting element located on the side of its cylindrical part, with the surface of the face of the pipe header, and subsequent tightening with given effort; - conjugation of the holes, made with a reverse taper, of the internal channels of each of the register pipes with the conical part of the corresponding connecting element of the upper and lower pipe manifold; - simultaneous pressing from both sides of the conical parts of the connecting elements of the upper and lower collectors into the conical holes of the internal channels of the register pipes with a given force. 3. A method for assembling a radiator according to claim 2, characterized in that before installing the connecting elements in the upper and lower pipe collectors, an adhesive composition is applied to the outer surface of their cylindrical part.

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