FR2672113A1 - STORAGE WATER HEATER. - Google Patents

Abstract

Storage water heater heated by a burner with a smoke tube, external thermal insulation and a helical coil arranged in said tube, inside the smoke tube (3) being provided a heat exchanger (6) connected the helical coil (7) housed in the water heater (8), and the water heater (8) being fitted along the flue pipe (3) with thermal insulation 20. To reduce the emission of pollutants , provision is made for the burner (1) to be designed as a premix burner, the mixing chamber (26) of which is connected to a gas line (27) and an air line (25), the two conduits (25) , 27) being provided with throttling members (29, 28) controlled by a common regulator (18).

Description

The present invention relates to a water heater with ac-

  cumulation heated by a burner with a smoke tube,

  exterior thermal insulation and a coil

  running. Such a water heater is known for example from DE-GM 82 08 266 In this device, the smoke tube, made in

  a heat conducting material, is surrounded by a ser-

  pinion whose propeller pitch increases with the distance vis-

opposite the burner located below.

  This solution has the disadvantage that during

  the burner stops the content of the water heater cools

  said by the effect of the smoke tube, which results in

  significant losses On the other hand, this cooling requires

  site, apart from hot water consumption times for heating or sanitary water, the repeated discount

  when the burner is running, which results in significant

  energy consumption and, consequently, by an emission-

increased pollutants.

  The object of the present invention is to avoid these inconveniences.

  come by offering a water heater of the type mentioned above-

  born which avoids these drawbacks by providing heating

  fast and largely avoiding losses by cooling

  sement. According to the invention, this object is achieved by

  that inside the smoke tube there is a swap

  heat geur connected to the helical coil housed in the water heater, and that the water heater is provided along the

  smoke pipe with thermal insulation.

  Thanks to this design, water heating is

  obtained very quickly by the heat exchanger available

2 -

  dried in the smoke tube At the same time, due to the

  thermal lation along the smoke tube, cools it

  Water in the water heater during burner shutdowns is largely avoided Due to the lack of heat requirements

  for space heating or the preparation of sanitary water

  shut up, this results in prolonged shutdowns of the burner

  their, which has the consequence that, compared to the total operating time, the number of burner start-up phases is minimized, phases which are characterized by high emissions of pollutants It is therefore only

  the relatively small volume of the heat exchanger available

  placed in the smoke tube, which undergoes noticeable cooling But as, thanks to the thermal insulation the

  along the smoke tube, the vertical thrust during the walk

  burner is important, the resistance of the sample

  heat gor and smoke backflow to the gas flow can also be important so that the current

  of air during the burner shutdown is low, which

  slows down the cooling of the contents of the heat exchanger. In addition, the arrangement of the heat exchanger in the smoke tube has the advantage of rapid heating of its contents, which also allows sampling

significant amounts of water.

  In addition, thanks to thermal insulation, relatively high heat requirements can be covered

  with relatively low burner output,

  This should not be modulated.

  for environmental protection reasons

  The reason is that a burner operating at constant load can

  normally be optimally adjusted with regard to

  does the emission of pollutants In addition, this solution is

  results in a very high annual return, as the experience

rience shows it.

  According to another characteristic of the invention, 1 '

  heat exchanger located in the smoke tube can be

-3 -

  be designed in the form of a helical coil, which simplifies

largely relies on construction.

  According to another characteristic of the invention, it can be provided that the smoke tube has at its lower end looking at the burner, a recess serving as combustion chamber where the burner is housed, and whose

walls are not insulated.

  In this way, there is in addition to the heating of the container.

  naked water heater by the heat exchanger, a heater

  direct age of the water heater from the sides although relative-

  of the smoke tube recess, which con-

  tribe to accelerate the heating of the contents of the water heater.

  To further reduce the emission of pollu-

  ants, it is expected that the burner is designed as a premix burner whose mixing chamber is connected to a gas pipe and an air pipe, both

  fitted with throttling devices controlled by a regulator

  common source, the combustion air being supplied by a pipe

  which wraps the exhaust gas pipe downstream of the pipe

  be smoke The burner is connected to the supply pipe

  tion in air by a pipe, and the evacuation pipe of

  gas is preferably fitted with a fan.

  To increase the yield, it is planned, according to

  another feature of the invention, that in the tu-

  gas discharge pipe, extending the smoke tube outwards, a heat exchanger is arranged upstream of the heat exchanger in the smoke tube, seen in the direction of flow of the water, and connected to a return

heating water.

  It is thus possible to use the heat of the gases

  leaving the smoke tube for heating the circulating water

  lant in the heat exchanger housed in the smoke tube

  which increases the efficiency of the water heater.

  In this context, moreover, provision may be made for

  frustoconical rim pierced by a tube connecting the two

  heat exchangers, to each other, which creates

  -4- be an annular slot, said collar shrinking

  down Under this flange is arranged a funnel

  black fitted with a discharge tube, and above the opening

  ture of said funnel, the connection tube between the heat exchangers is designed in the form of a siphon to avoid it. This allows the water to be drained very simply

  condensation that can result from an energy cooling

  burnt gases, and thus safely avoid its

  penetration into the smoke tube.

  According to another characteristic of the invention, it

  the exhaust gas pipe downstream of the pipe is

  be smoke is surrounded at least in places by an air pipe extending outwards, the exhaust pipe being provided along the parts enveloped by the pipe

  air, on its inner and outer faces, of rib-

  res The air hose is connected to pipes serving

  ventilation of premises, preferably using a ventilator

  tilator, exhaust pipes being connected to the gas exhaust pipe by a pipe o is

  preferably arranged an adjustable throttle member.

  It is thus possible to use the water heater

  Also for space heating, the fresh air coming from outside is heated by the ribs of the exhaust pipe.

  In this case, it can also be provided that the organ-

  no throttle installed in the connecting pipe

  exhaust pipes and a ventilator

  laid in the drain pipe are ordered together

by a common regulator.

  This allows optimal regulation of the ventilation of the room. According to another characteristic of the invention, a valve is provided in the pipe connecting the outlet of the heat exchanger in the smoke tube to the inlet of the helical coil in the water heater, the outlet of said coil being connected, via another valve, to the outlet of the heat exchanger placed in the smoke tube The two valves are controlled by the

same regulator.

  All these measures allow optimal use.

  water heater male This is how, for lack of domestic water needs, the heating circuit can work

  exclusively using the installed heat exchanger

  in the smoke tube, the coil in the water heater being off, which largely prevents losses of

  heat In addition, it is possible to ensure this without diff-

  difficulties preparing domestic water even if the temperature

  The heating circuit supply must be

  higher than the maximum temperature allowed for the preparation

  sanitary water In this case, the heating circuit can be supplied exclusively by the heat exchanger in the smoke tube, the valves

  being adjusted accordingly It is also possible to

  to assess the heat requirements for the heating water by

  the water heater if the supply temperatures are low

  below the maximum temperature of said water heater, which makes it possible to reduce the number of operating cycles

  from the burner, and thereby the emission of pollutants.

  Hereinafter, the invention is described in more detail with the figures of the drawing in support, which show:

  Fig 1, a first embodiment of the water heater

according to the invention,

  Fig 2, another embodiment of the compliant water heater

mention to the invention,

  Fig 3, a detail of another embodiment of the heater

water according to the invention,

  Fig 4, another embodiment of a heater

water according to the invention.

  In the water heater 8 according to fig 1, it is pre-

  saw a central smoke tube 3 provided at its lower end with

  a combustion chamber 2 formed by a recess in the tu-

  be 3 and where is arranged the burner 1 controlled by a regulator

  reader 18 to which it is connected by a line 42.

  The water heater 8 is externally covered with thermal insulation 21, both on its periphery and

on its front faces.

  Inside the water heater 8 is installed a helical coil 7 which surrounds the smoke tube 3 and which is connected to a heat exchanger 6 provided with a catalytic layer, also in the form of a helical coil, which is willing

  at the top of the smoke tube 3.

  Along the smoke tube 3, the water heater 8 is mu-

  nor in addition to a thermal insulation 20 avoiding large-

  when the burner stops Hâla heat transmission to the interior of the smoke tube 3 Only the walls of the combustion chamber 2 are not insulated, but

can be too -

  Above the smoke tube 3, there is provided a gas discharge pipe 22 which pierces the front face 43 and extends outwards In this pipe is installed a fan 23 Said pipe is further wrapped by a pipe air supply 24 which also extends outwards, through a wall 44 By a pipe, the supply pipe 24 is connected to a mixing chamber 26 of the burner 1, into which also a

gas pipe 27.

  Both in line 25 and in the

  gas 27 is provided a respective throttling member 28

  ment 29 which are powered by motors 62 connected by

line 42 to regulator 18.

  The heat exchanger 6 communicates with the return of a heating installation 46 which comprises a circulation pump 14 and a bypass 13 connected to a

  3-way distributor 15 connected on the one hand to the supply hose

  supply 11 of the radiators 12 of the heating installation

  fage 46, and on the other, the helical coil 7 in the water heater If necessary, this distributor can be -7-

replaced by two solenoid valves.

  The water supply to the water heater 8 is marked

  by 9, its withdrawal being made by a pipe 10 with ro-

  water intake tap 47, after heating the sanitary water

  re in the water heater 8 by the water heated by the sample

  heat sink 6 and circulating in the coil 7.

  Burner 1 is controlled as a function of the temperature

  the domestic water in the water heater 8 is measured, measured by a thermometric probe 16 In the event of domestic water being drawn, which causes the temperature in the water heater to drop, the heating circuit is closed by l '' bypass 13, the 3-way distributor being controlled accordingly by the regulator 18 which also acts on the circulation pump 14 and which is connected

to these two organs.

  The example of embodiment according to fig 2 differs

  of that of fig 1 by the fact that the combustion air supply

  This is done from the room where the whole is installed.

  In addition, it is provided in the exhaust gas pipe

  22 an additional heat exchanger 30 which communicates

  only with return 45 from the heating installation.

  This heat exchanger 30 is arranged, seen in the direction of flow of the water, upstream of the coil 6, which,

  in the smoke tube 3, serves as the first heat exchanger

  their, and is connected to it by line 31 which allows

  this a collar 32 thus forming an annular slot 33.

  Below this flange 32, the pipe 31 is re-

  in the shape of a siphon to pass next to a funnel

  black 35 which includes an evacuation tube 36 which pierces the evacuation pipe 22 and leads to a collector 48 for the condensation water The opening of the flange 32 is

  smaller than that of the funnel 35 to guarantee the

  safe evacuation of condensed water.

  The example of embodiment according to fig 3 includes

  also an air hose 24 which envelops the evacuation hose.

  tion 22 which is provided on its inner and outer faces

  with ribs 40 and 40 'to ensure transmission

  from the heat of the burnt gases to the supply air. In this case, the air hose 24 is connected by a connector.

  pick 36 which includes a fan 38, to pipes

  for the ventilation of a room 48 The pipelines of

  corresponding evacuation pipes are connected to the evacuation pipe

  tion 22 via a pipe 37 fitted with a foreign member

regulation 39.

  An actuator 41 is provided which, as a function of the temperature in the room 48 to be conditioned, measured by a

  thermometric probe 49, acts on the fan motor 23 '

  reader 23 and the motor 42 of the throttle member 39

  via lines 51 and 52, the temperature sensor

  metric 49 being connected by a line 50 to said actuator

  41 which is part of the regulator 18.

  In the embodiment according to fig 4, there is provided, above the smoke tube 3, a non-return

  smoke 4 which precedes a pipe 5 upstream of the exhaust pipe

gas evacuation 22.

  In addition, in this embodiment, the outlet of the coil 7 connected to the supply pipe (11) of 1 '

  heating system, in which the device is arranged

  tributor 15, communicates via a line 58 with the outlet

  tie of the heat exchanger 6 installed in the smoke tube 3, said pipe 58 comprising an electrovalve 57 controlled by the regulator 18 by a line 56 In addition, the inlet of the coil 7 is directly preceded by

  another solenoid valve 54 connected by a line 55 to the

  regulator 18 which controls it A pipe 58 opens upstream of the solenoid valve 54 in the pipe 53 which connects

  the outlet of the heat exchanger 6 in the fuel tube

  mée 3 at the entrance of the helical coil 7.

  The two solenoid valves 54 and 57 allow a suitable

  optimal performance under the given service conditions.

  This is how, for example, the burner 1 can be

  switched on thanks to priority mounting for heating

8 - -9-_

  fage of the water heater if the temperature in said heater

  water is less than a preset lower limit value

  set for the temperature of the water heater, the installation

  heating 46 being switched on by the action of the

  3-way timer 15, until a limit value su-

  temperature of the water heater is reached.

  To this end, the solenoid valve 54 is open, and the electro-

valve 57, closed.

  This results in a water circuit from the sample

  heat sink 6 in the smoke tube 3, which continues through the solenoid valve 57, the coil 7, the distributor

  and the circulation pump 14 to return to the sample

  heat gor 6, which allows to heat quickly

the contents of the water heater 8.

  In this case, the burner 1 does not start,

  heat requirements for space or domestic water heating, only when the temperature of the

  water heater is below the preset lower limit

respective ice.

  During the space heating period, two cases may arise: 1 The tv supply temperature required in the pipe 11 according to the heating diagram is higher than the upper limit value preset on the setpoint signal generator 61 for the temperature of the water heater:

  In this case, the solenoid valve 57 is closed by the ac-

  tion of the regulator 18, and the solenoid valve 54 is open, so that the water heater 8 respectively the coil

  7 is short-circuited and the heating circuit is on

  mented exclusively by the heat exchanger 6 in the

smoke tube 3.

  2 TV supply temperature is lower than

  the upper limit value of the heating temperature

fe-eau:

  In this case, the solenoid valve 57 is open and the electro

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2672113

  trovalve 54, closed This results in a water circuit which

  part of the heat exchanger 6 to pass through the service

  pentin 7, the distributor 15, the heating installation

  ge 46 and the circulation pump 14, the heating needs

  first being covered by the water heater 8 which is

  cools accordingly In heating systems

  fage b t, the burner 1 does not start until the time

  water heater temperature is below the limit value

  te lower also preset on the signal generator

  setpoints 61 For supply temperatures

  higher, you need a signal or a function (e.g.

  identifying the lower limit value of the temperature

  water heater) to ensure timely heating of the heater

fe-eau. il 2672113

Claims (6)

R E V E N D I C A T I O N S   1 Storage water heater heated by a burner   with a smoke tube, external thermal insulation   and a helical coil arranged in said tube, characterized in that inside the smoke tube (3) there is provided a heat exchanger (6) connected to the helical coil (7) housed in the heater -water (8), and that the water heater (8) is provided   along the smoke tube (3) of thermal insulation   than. 2 water heater according to claim 1, characterized in that the heat exchanger arranged in   the smoke tube (3) is designed as a serpentine vice (6).   3 Water heater according to claim 1 or 2, character-   laughed at by the fact that the smoke tube (3) has   its lower end looking at the burner (1), an   used as a combustion chamber (2) where the burner (1) is housed, and the walls of which are not insulated.   4 Water heater according to one of claims 1 to 3,   characterized by the fact that the burner (1) is   designed as a premix burner whose   12 - mixing bre (26) is connected to a gas pipe (27) and an air pipe (25), the two pipes (25, 27) being provided with throttling members (29,   28) controlled by a common regulator (18).   Water heater according to one of Claims 1 to 4,   characterized by the fact that for the adduction of 1 '   combustion air, a pipe (24) is provided which   hooks up the gas exhaust pipe (22) downstream of the smoke tube (3), the burner (1) being connected   to the air supply pipe (24) by a pipe   te (25), and the gas exhaust pipe (22) being   preferably fitted with a fan (23).   6 Water heater according to one of claims 1 to 5,   characterized by the fact that in the evacuation pipe   tion of the gases (22), extending outwards the smoke tube (3), a heat exchanger (30) is arranged upstream of the heat exchanger (6) in the smoke tube (3) and connected heating water return. 7 water heater according to claim 6, characterized   by the fact that a frustoconical collar is provided   that (32) pierced by a tube (31) connecting the two é-   heat changers (30, 6), to each other, which   gives rise to an annular slot (33), said adhesive   rette (32) tapering down, and a funnel   black (35) disposed under this flange and provided with a discharge tube (36), the connection tube (31) being designed above the opening of said funnel in the form of a siphon to avoid it.   8 Water heater according to one of claims 1 to 7,   characterized by the fact that the drain hose   gases (22) downstream of the smoke tube (3) is surrounded   13 - re at least in places by an air hose (24) s'   extending outward, and the drain hose   tion (22) is provided along the part enveloped by the air hose (24), on its inner and outer faces, of ribs (40, 40 '), the air hose (24) being connected to pipes for ventilating rooms, preferably using a fan   (38), and evacuation pipes being connected   chées on the gas discharge pipe (22) by a pipe (37) o is preferably arranged a member adjustable throttle (39).   9 Water heater according to claim 8, characterized   by the fact that the throttling organ (39) installs   in the connecting pipe (37) of the channels   evacuation stations and a fan (23) arranged   in the gas exhaust pipe are controlled   seems by a common actuator (41).   Water heater according to one of Claims 1 to 9,   characterized by the fact that the heat exchanger   (6) arranged inside the smoke tube (3) is mu-   nor of a catalytic layer at least on the part where its temperature falls within an average, optimal range. 11 Water heater according to one of claims 1 to 10, characterized in that there is provided a valve   (54) in a pipe connecting the outlet of the sample   heat sink (6) in the smoke tube (3) in the   entry of the helical coil (7) into the water heater (8), and the outlet of said coil (7) is connected,   via another valve (57), at the outlet   tie of the heat exchanger (6) arranged in the tube   be smoke (3), the two valves (57, 54) being com-   mandated by the same regulator (18).