FR2700382A1 - Double exchanger for the constitution of a boiler sectional heater. - Google Patents

Abstract

The double exchanger is formed of a right half-exchanger (2) and a left-hand half-exchanger (3) which are mechanically joined and hydraulically connected on the one hand to each other to form a double exchanger (1) equivalent to 'a one-piece exchanger and connected on the other hand to the adjacent half-exchangers at their upper and lower ends to form a sectionable heating body (4) of the boiler. Application to sectionable cast iron boilers.

Description

The invention relates to an element

  double heat exchanger for sectional cast iron boiler.

  The heating body of a boiler section-

  nable is formed by the juxtaposition-assembly of a number of heat exchanger elements of

preferably cast iron.

  Each exchanger comprises a low inlet of cold water and a high outlet of heated water in the form each of a through opening whose

border serves as a reach surface.

  The assembly is carried out by means of double junction or connection sockets

traverses called nipples.

  These exchangers are satisfactory in terms of exchange performance, but they are heavy, bulky and expensive and require

  investment in the foundry These disadvantages

  are real and become sufficiently important

  already for boilers of medium power, that is,

  The heating elements of these are formed according to a particular embodiment of two parallel rows of heat exchangers.

smaller dimensions.

  These exchangers are mounted in the same way as the monobloc heat exchangers of small boilers

power by nipples and tie rods.

  We thus find ourselves with two batteries of exchangers in parallel of which we must gather the inputs and outputs of the end exchangers by

  collectors, as illustrated in Figure 4.

  This mandatory mode of construction presents

various disadvantages.

  This solution proves to be expensive for the following reasons: the parts performing the function of collector are complex, and therefore more difficult to manufacture; assembly requires more manpower; the present invention aims to overcome these various disadvantages For this purpose, it relates to a double heat exchanger for boiler with sectionable heating element characterized in that it is formed of a half-exchanger right and a half-exchanger left mechanically joined and hydraulically connected

  on the one hand between them, and on the other half

  adjacent exchangers at their upper and lower ends so as to constitute a complete transverse exchanger element, equivalent to a

  monobloc exchanger, constituting after juxtaposition-

  assembling the heating body of a boiler.

  These characteristics confer on the invention

a multitude of advantages.

  A single upper collecting line or lower distributor line avoids the use of external parts ensuring the union of the two circuits. A single upper collecting line ensures a better homogenization of the hot water currents The assembly of the elements proves to be less difficult in because of the presence of a single range area

  high and low for each exchanger.

  Other advantages are worth mentioning such as those below: the total weight of the equivalent exchanger element is reduced; possibility of making more powerful boilers with the same molding technology

  tolerance compensation which is carried out

  ACTUALLY. Other technical characteristics and advantages of the invention will appear in the

  description which follows, given as an example and

  accompanied by the drawings which represent: FIG. 1: a perspective view of a heating body formed by the juxtaposition of the exchanger elements according to the invention; FIG. 2: an exploded perspective view

  connection areas showing more

  firstly the ends, one upper and the other lower of the two corresponding half-exchangers; Figure 3 is a plan view of a assembled section of heater; FIG. 4: a schematic perspective view of a

  heating body according to the prior art.

  The invention proceeds from the general inventive idea according to which a sectionable heating body of a boiler is constituted by a double

  longitudinal succession of independent half-exchangers

  right and left beams mechanically and hydraulically connected to each other and in battery between a single upper outlet collector line and a

single lower entry line.

  According to the invention, an exchanger element 1 equivalent to the conventional type is formed by

  the combination of two elementary or half exchangers

  exchangers right 2 and left 3 called to constitute

  after assembly a heating body 4 of a boiler.

  Each half-heat exchanger 2 or 3 has a "C" -shaped profile with concave inner central part 5 intended to delimit with the central part of its counterpart opposite and with its neighbors a combustion chamber 6 in which the

  flame of a gas or oil burner.

  These concavities allow after assembly

  juxtaposition of making a volume in length forming the

combustion chamber 6.

  The half-exchangers comprise an outer edge 7 right and an upper edge 8 and lower 9 also straight or slightly inclined in convergence towards the outer edge, so as to form a heating body of general shape

substantially parallelepipedic.

  According to the invention, the heat exchangers

  2 or left-hand half-exchangers 3 are preferably identical and mounted inverted. They can be described as reversible because they are both

come out of the same foundry mold.

  Each half-heat exchanger 2 or 3 is in the form of a flat hollow volume with front-end walls and 11 and rear-walled walls 12 and 13. The walls of this volume delimit a closed flat interior chamber opening at one end. then the other of its ends by a lower through opening 14 or 15 receiving cold water and then through an upper through opening 16 or 17 delivering the water

heated.

  Each lower or upper through opening opens out on the one and the other side of the ends of the half-exchanger They open on one side on a lower junction plate 18 or 19 and on an upper junction plate 20 or 21 and on the other side on respectively lower connection plates 22 or 23 and above 24 or 25 facing the connecting plates These connecting plates and these connecting plates constitute the upper and lower side faces of the upper and lower ends of the half -Exchangers and serve as bearing surfaces at the hydraulic and mechanical junctions between the successive half-exchangers This hydraulic junction is provided by means of connecting pieces of the lower biconical sockets type 26 and

  higher 27 classically called nipples.

  We distinguish intermediate nipples

  inferior and superior and international nipples

  lower and upper heat exchangers.

  The heat of the combustion is transmitted to the water via each of the walls of each half-exchanger. The opposite faces are provided with or without pins arranged in alignment or interpenetrating to improve significantly the performance.

of heat exchange.

  They are also locally traversing by passages called flues, for example three in number for each half-exchanger, namely lower passages such as 28 and 29, medians and 31 and 32 and 33 higher to constitute channels of additional exchange after juxtaposition

along the heating body.

  The fumes, after their exit from the combustion chamber 6, borrow the flues, for example lower, as shown by the curved arrows of Figure 1, to be taken up by a front collector and then discharged outside through the other flues . To avoid a longitudinal shift, the junction plates of the lower and upper ends of the half-exchangers are offset back from the plane of one of the front or rear faces Furthermore, the upper and lower connection plates are located substantially in the extension of a

  front or rear face walls 10 to 13.

  As indicated, these platinum-shaped ends serve as support and assembly zones against which the homologous plates of the ends facing the adjacent half-exchanger and adjacent elementary exchangers making up the body

heated.

  For reasons of economy of manufacture by using the same mold or to facilitate the creation and production of molds, it is preferred to use identical shapes for each of the two half-exchangers forming a complete exchanger torque

  equivalent of a complete monobloc exchanger.

  So, just return a half

  exchanger from bottom to top to pass a half

  exchanger left to a half-exchanger right and vice versa. The assembly is carried out conventionally by means of nipples and tie rods. For a complete exchanger it is necessary to provide intermediate nipples making the median junction between the two half-exchangers right and left component. According to a preferred variant of the invention, the junction takes place in the joint plane of each

elementary exchanger element.

  To this end, each extension constitutes

  killing the upper or lower ends of each elementary exchanger or half-exchanger has a first junction face in extension of the face of one of the large walls of the exchanger while the second junction face is preferably in the

extension of the joint plane.

Claims (6)

  1 heat exchanger intended to form by juxtaposition with its counterparts the heating body of a sectional boiler, particularly in   cast iron, characterized in that it is formed of a half   right exchanger (2) and a left half-exchanger (3) mechanically joined and hydraulically connected, on the one hand between them, and on the other hand to the adjacent half-exchangers at their upper and lower ends in order to constitute a transverse element double exchanger (1), equivalent to a monobloc exchanger, constituting after juxtaposition-assembly a   heating body (4) sectionable boiler.   2 exchanger according to claim 1, characterized in that the half-exchangers left (2) and   right (3) are identical and mounted inverted.   3 exchanger according to claims 1 and 2,   characterized in that each half-exchanger (2) or (3) has a general concave face "C" profile (5) delimiting with its counterpart the volume of a combustion chamber (6).   4 Exchanger according to any one of   preceding claims, characterized in that   each half-exchanger (2) or (3) has ends, respectively high and low, with a flat lateral face forming lower (18) or (19) and upper (20) or (21) junction plates and lower connections (22) or (23) and higher (24) or (25).   Exchanger according to Claim 4, characterized in that the lower or upper connection plates are substantially in the extension of the adjacent front or rear face wall of the half-exchanger and in that the connecting plates are set back from the plan   opposite front or rear wall.   6 Exchanger according to any one of   preceding claims, characterized in that the   hydraulic connection takes place through   of lower (26) and upper (27) biconical sockets. 7 Exchanger according to any one of   preceding claims, characterized in that   each half-exchanger (2) or (3) has through-passages, bottom, middle and upper intended to constitute flues.   8 Sectional heating body for a boiler, particularly of cast iron, characterized in that it is formed by the juxtaposition and assembly of heat exchangers above.