CN1708662A

CN1708662A - Condensation heat exchanger with plastic housing

Info

Publication number: CN1708662A
Application number: CNA2003801016774A
Authority: CN
Inventors: J·勒梅; R·詹诺尼
Original assignee: REALISATION MECANIQUES ENGENEE
Current assignee: Giannoni France
Priority date: 2002-10-16
Filing date: 2003-10-10
Publication date: 2005-12-14
Anticipated expiration: 2023-10-10
Also published as: FR2846075A1; CN100394121C; FR2846075B1

Abstract

The invention relates to a heat exchanger comprising at least one spirally mounted tube bundle (2) the highly heat-conductive walls of which have a flattened oval cross-section, the major axis of which is perpendicular or substantially perpendicular to the axis (X-X') of said spiral, while the width of the gap separating two adjacent turns is small and constant, said tube bundle being fixedly mounted inside a gas-impermeable casing (1) which houses the tubes for discharging the gases generated by a burner (6), the heat exchanger also comprising means for circulating cold water inside the tube bundle (2), said exchanger also being designed so that the hot gases pass radially through said tube bundle through the gaps separating its turns. Said exchanger is characterized in that the shell (1) is made of heat-resistant plastic and in that it comprises means (5; 3-30) for mechanically retaining said tube bundle in the axial direction, which means are capable of suppressing the thrust loads generated by the internal pressure of the fluid and also preventing these loads from being transmitted to the shell (1). The condensation heat exchanger of the invention is especially designed for domestic use and is inexpensive to produce.

Description

Condensate and heat exchanger with plastic casing

The present invention relates to a kind of condensate and heat exchanger that links to each other with burner, particularly gas or fuel burner directly or indirectly.

This interchanger particularly is installed on the gas boiler of family's use, its objective is the water that center heat supply circulation is provided and/or is provided for cleaning use.

More particularly, the heat exchanger that has formed theme of the present invention is one type a heat exchanger, it comprises the housing that has defined enclosure space, in housing, held by one or more and had at least one tube bank that the pipe that is driven plain section constitutes, in document EP-B-0 678 186, disclosed such tube bank, can be as required as a reference with it.

Document EP-B-0 678 186 has described heat exchanger element, and it comprises the pipe of being made by high heat conducting material, and the fluid that heat is transmitted is for example wanted heated water, circulation in pipe.This manages shape ground winding in the shape of a spiral and has the elliptical section that is driven plain, the main shaft of this section is substantially perpendicular to the axis of screw, and each circle of this pipe all has flat surface, these surfaces by the Fixed width degree the gap and the surface of adjacent turn separately, wherein said width is basically less than the thickness of described section, in addition, the interval of two adjacent turns also can be calibrated by partition, and these partitions are made up of the projection that is formed in the tube wall.

This piece document has also been described a kind of a plurality of elements that comprise, the heat exchanger of said elements for example, and these elements are arranged by the different modes in each listed embodiment.

The interchanger element of designing so just can be at very hot gas and the fluid that will heat, for example circulate between the water of inside of this tube element very effective heat exchange is provided, wherein these hot gas can directly be produced by the burner that is installed in the enclosure space, perhaps from external heat source, and the inswept tube element of these hot gas.

Specifically, in the process of hot gas through gap between described circle, thermal current contacts with the relatively large zone of the wall of interchanger element on radially direction roughly.

More particularly, the object of the present invention is to provide the condensate and heat exchanger of this general type of listing above, its heat exchanger element is flat tube bank, for example disclosed in the above-mentioned EP-B-0 678186.

The housing of the known condensing plant of the sort of type that formation is listed above as the pipe or many pipe, by metal, be generally stainless steel and make.

Metal, particularly stainless steel not only provides the mechanically ability of anti-stress, and providing chemically erosion-resisting ability, wherein said stress to be because the expansion that produces in the winding of pipe or many pipe formation causes, corrosion then is to come from waste gas (burnt gas) and condensate.

Only, under this situation, should be noted that in use the pressure of the inside fluid, particularly water that will heat of pipe (or many pipes) may be quite high, cling to about 2.5 to 3.5 greatly, promptly 2.510 for the purpose of example ⁵To 3.510 ⁵Handkerchief.

For purpose of safety, tube bank preferably is designed to resist 4.510 ⁵The pressure of handkerchief.

Being initially flat sidepiece and can having the trend that expands of pipe, the amplitude of distortion is the increasing function of interior pressure value.

By managing the formed projection of separating of partition, this distortion axially advances to adjacent tube wall from a tube wall.

Only for the purpose of example, be adopted as four side by side and wall thickness be the winding of the pipe of 0.6mm, be 128mm when its axial dimension begins, be that 2 crust and pressure are 3 when clinging at pressure, after pipe deformed, this size was respectively 129.2mm and 129.8mm.

Whole elongation is proportional to end-to-end installation and has constituted the number of winding of the tube bank of interchanger.

Certainly, the wall thickness of increase pipe also may reduce the amplitude of distortion.Regrettably, excessive increase thickness can cause the weight of device to increase significantly.If pipe fitting is by shaped by fluid pressure, requires the method for high operating pressure to make also and can go wrong.

In order to stop elongation and can to bear because the axial thrust that interior pressure caused of the fluid that in tube bank, circulates, the method that is adopted is to adopt metal shell (as the supporting that is positioned at place, tube bank two ends) up to now, its thickness and mechanical strength are selected to them can prevent that described tube bank under interior pressure effect axial elongation taking place, and perhaps it is limited at least to limit within the acceptable amplitude that is consistent with the strain of housing.

Such interchanger particularly is gratifying on the performance level with regard to technical merit.

Yet, the weight that it is suitable, and this can cause in its installation process, to its transportation and processing the time, may bring difficulty to the operator, and because in order to resist mechanical stress and because chemical attack that waste gas and coagulation brought, it must adopt by high-quality metal, the housing made of stainless steel for example, thus its cost is quite high.

The present invention based on purpose be, by making it be equipped with a kind of housing to reduce the weight and the cost of this device significantly, though wherein said housing be can't help valuable and expensive material basically and is made, it is plastics in the case, but with regard to the above-mentioned axial expansion problem that relates to, it can not bring any problem about resist chemical or mechanical strength.

Another object of the present invention is, in a kind of distortion embodiment, preferably with by the heat that multi-turn produced of burnt gas be isolated in order to ensure plastic casing through winding, and so temperature level that is born in order to reduce housing fully, by adopting simple, light and cheap device, reaching this purpose for the cover that adopts execution heat screen function in such cases.

The condensate and heat exchanger that has formed theme of the present invention links to each other with gas burner or fuel burner.

It comprises at least one tube bank, thereby this tube bank by a pipe or one group with forming of end-to-end layout the pipe of spiral winding form, wherein the wall of individual tubes or many pipes is made by the material of high conductance and is had a flat elliptic jet, the axis of the vertical or vertical substantially described spiral of the main shaft of this section, the width in the gap that two adjacent turns are separated is constant and preferably less than the thickness of described section simultaneously, described tube bank is fixedly mounted in air-locked enclosure interior, heat exchanger comprises that also being used for circulation will be heated fluid, particularly be positioned at the device of managing or constituting the cold water of the many pipes of restraining, this housing has the sleeve pipe that is used to discharge burning gases, like this, described tube bank radially or is roughly radially passed in this interchanger gap of being arranged to the hot gas that produced by the burner a plurality of circles by separating it.

According to the present invention:

-on the one hand, described housing is made by heat resistant plastice, and

-on the other hand, interchanger comprises the device in the axial direction that mechanically described tube bank is remained on it, this device can absorb by circulating in the interchanger and being tending towards making the thrust load that interior pressure produced of the fluid that exchanger wall deforms, and prevents also that simultaneously these load are delivered on the housing.

Therefore, up to the present two tasks bearing of housing are, promptly as being used to circulate and discharging the enclosure space of hot gas, and as collecting and the enclosure space of discharging condensate, and in addition, also to guarantee the mechanical stability of restraining.

In addition, according to favourable but do not limit being characterized as of given number of the present invention to the present invention:

-interchanger comprises the temperature probe by described housing supporting, and when near the most of temperature being positioned at this probe in the housing surpassed the limit of setting, this temperature probe can be closed burner;

-described holding device comprises one group of band, and it is outside that it extends in tube bank, is parallel to the axis of spiral, and its end is fixed on the supporting member that is pressed against on tube bank two opposite faces.

-the supporting member that is positioned at an end place of one group of band is a thin plate, for example is plate-like, and its core is cut out, and is ring-type therefore.

-described plate as partly with the end face of the opening surface of housing sealing, and for example by crimping be fixed on housing around on.

Described end face is passed in a little outwards outstanding mode in the end of-band, and these ends are provided with screw thread, thereby their allow lid removably to be installed on the end face by bolt.

-described lid is fixed on the burner;

-have four bands that are square basically and arrange, and be positioned at respect to the supporting member of the opposite side of described end face by a pair of be constructed to consistent as much as possible with the profile of restraining and be pressed against two on its diametric(al) relatively the arc or the curved bel in zone form, every curved bel all is fixed on a pair of adjacent being with;

The plastics of-formation housing are the synthetic material of strengthening based on glass fibre or the sheet glass resin is strengthened;

-described resin is polyphenylene oxide, polystyrene and polyacrylic compound;

-interchanger comprises two end-to-end layouts and the coaxial tube bank that is connected with each other, intrafascicular one of these two coaxial pipe is as main switch, another is as secondary interchanger, diversion component is clipped between this two beam tube, and therefore be arranged at first pass through main switch by the hot gas that burner produces, pass the gap of the circle of separating it from inside to outside, pass secondary interchanger then, pass the gap of the circle of separating it more from outside to inside.

-deflector is fixed in the described tube bank;

-because burner is installed in the inside as the tube bank of main switch, therefore described deflector is discoid and the end that is fixed on burner, and this deflector has the heat insulation sealing around it, and sealing is pressed against the inside of tube bank;

-described housing is made up of two and half housings that combine and for example be fixed by welding in together;

-interchanger comprises cover, and this cover is positioned at the inside of the outside and described plastic casing of the tube bank that is made of individual tubes or many pipes, and this cover is as heat screen, and it can make this housing and the heat that is discharged by waste gas be isolated.

-this cover is made by thin stainless steel substrates;

-this cover is applied on the inner surface of plastic casing, and by making itself and described inner surface keep certain distance in the wall that for example a series of projections is compressed on cover;

-this cover is made up of the central portion of two complementations, thus these two parts toroidal shell that has formed on the inner surface that is engaged in described plastic casing combined together;

-described central portion mutually over against the edge have and arrange semicircular in shape or half elliptic notch basically, when these central portions were combined together, these notches can closely will constitute the individual tubes of winding or the straight line end of many pipes surrounds.

Other features and advantages of the present invention will become from specification and accompanying drawing obviously, and these accompanying drawings only are to have represented the possible embodiment of the present invention with non-circumscribed example.

In these accompanying drawings:

Fig. 1 is the front view of first embodiment of the invention, and this secondary figure is cut open along sectional elevation I-I among Fig. 2;

The left side view of Fig. 2 for installing among Fig. 1;

Fig. 3 and 4 for respectively with Fig. 1 and the similar view of Fig. 2, they only show tube bank and its holding device;

Fig. 5 is and the similar view of Fig. 1, and it shows second of interchanger may embodiment, and the whole axial dimension of the interchanger in this embodiment is less;

Fig. 6 is the side view of heat exchanger among Fig. 5, and it shows here to be adopted is used to keep the method for restraining;

Fig. 7 is the front view that schematically shows these holding devices;

Fig. 8 is the detailed view that shows the possible distortion of the Temperature Detector that is adopted, and this detector has replaced that shown in Fig. 5;

Fig. 9 shows the operation of installing among Fig. 5;

Figure 10,11 and 12 for respectively with Fig. 1,2 and 3 similar views, they show the interchanger in the third embodiment of the invention, this interchanger does not have burner;

Figure 13 and 14 respectively the do for oneself front portion and the side-view of interchanger of the present invention, these accompanying drawings are for what cut open along the perpendicular that passes the axis of winding, and embodiment is similar among this interchanger and Fig. 5, still comprises the cover that is used to finish heat insulating function;

Figure 15 and 16 shows two ribbon elements (yet not surrounded circle) that constituted cover in the mode of signal once more.

Interchanger shown in Fig. 1 and Fig. 2 comprises shell or the housing 1 that defines enclosure space, is installed with tube bank 2 in enclosure space, this tube bank by the end-to-end layout of one-tenth and be in series, axis is that the helical form winding of X-X ' is formed.

These pipes are flat section pipe, and the big lateral vertical of section is in axis X-X '.

The projection 200 that is positioned on the big side of pipe is finished the function of partition, thereby defines the gap with value constant basically, that be calibrated between each circle.

The fluid that heats, water for example runs through the inside of this winding.

In the embodiment illustrated, the combined together and serial connection mutually of three screwed fittings wherein wants heated fluid be recycled to the right from the left side.

Be fixed on

collector

15,16 on the housing 1 make device in a conventional manner be used for feeding and want the heated cold fluid and the pipe of discharging hot fluid to be connected.

These collectors also are transported to adjacent winding with fluid from the pipe fitting circulation.

Each pipe fitting all has straight end, also is the end with straight axis, and it also has the variable section that increases gradually simultaneously, and the section of the end that pipe fitting is outstanding is circular.

In the described embodiment of Fig. 2, both ends are arranged to parallel and are positioned at the same side of winding.

Can notice that also similar arrangements also is provided in the 3rd embodiment shown in Figure 10 and 11.

In contrast, structural similarity with the embodiment shown in the accompanying drawing 24 of European patent EP 0 6,781 86 already mentioned above, in the second embodiment of the invention shown in Fig. 5 and 6, the both ends of tubulose winding extend in the identical plane, and their opening is guided on away from each other the direction.

The import of pipe fitting and

outlet

20,21 suitably are crimped the certain openings that is arranged in housing 1 in the mode of sealing, as seeing from Fig. 2;

Collector

15,16 is fixed on this horizontal plane.

According to principal character of the present invention, housing 1 is made of plastics.

It is for example to be obtained by rotary gelcasting method or injection model method.

Housing is made by two and half housings, and after restraining one the inside that has been installed in them, this two and half housing is heat-sealed together.

Housing 1 has opening at its a sidepiece place, and when with reference to figure 1, in this case, this opening is positioned at the sidepiece place on the left side.

When using this device, condensation takes place in the vapor portion that burning gases contain when contacting with tube wall.

The diapire of Reference numeral 10 expression enclosure spaces; In a kind of known mode, this bottom is tilted, and allows condensate to discharge towards opening 13 thus.

The Reference numeral at housing rear portion is 11; It has depressed part 110, this depressed part as will after see, formed passage, the gas of burning and waste gas this passage of flowing through, and with their guidings to exclusion sleeve 12.

Certainly, hole 13 links to each other with condensate drain, while sleeve pipe 12 and exhaust pipe, and for example waste gas duct links to each other.These pipes and pipeline do not have shown in the drawings.

The open side of housing is by 3 sealings of end face parts.The latter is fixed on by edge 30 on the whole periphery of housing, and wherein said edge 30 is crimped onto on the circumferential flange 14 that has defined the housing inlet in bubble-tight mode.

Sealing, for example to be positioned on this horizontal plane be favourable to silicones sealing (not shown).

For example the end plate of being made by stainless steel 3 is usually by movably covering 4 sealings.

In shown embodiment, lid 4 is formed for two parts; It comprises by heat resistant plastice or metal outside plate 40, and by insulating materials, for example the inner panel 41 made of the insulating materials of ceramic base.

This two boards is run through by an opening at their core, burner 6, and for example for gas burner passes across this opening, and burner covers on 4 by being fixed on by unshowned here mode.

The appropriate device that links to each other with burner 6 makes the fuel mixture of gas and air (for example methane+air) enter into this device becomes possibility.

These devices can, particularly form by being fixed on the fan that covers and admixture of gas can be blown in the burner, perhaps form by being connected to the flexible pipe that covers.

Burner 6 is installed with a plurality of apertures for to have the cylindrical tube of blind end on the tube wall, these apertures make fuel mixture radially lead to the outside of pipe.

The outer surface of this wall has constituted burning surface.For example comprise the ignition system of known type of spark producing electrode yes and link to each other with burner.

Burner is axially coaxial with the center of winding 2, but it is not to extend on the whole length of winding.

In fact, tube bank 2 is divided into two parts, and one is the part 2a that is positioned at the left side of deflector 7, and another is the part 2b that is positioned at the right of deflector 7.

Deflector 7 is a heat insulator, for example the dish made of ceramic based material; It is supported by the reinforcement feature with thin corrosion resistant plate 70 forms, and wherein this corrosion resistant plate is inserted between two adjacent turns of tube bank all around.

The interchanger discussed 10 is the double cross parallel operation, and for example shown in Fig. 8 of aforesaid European patent, this interchanger makes acquisition efficiently become possibility.

The part 2b of tube bank is used for preheating is carried out to the fluid of left side circulation in the right from Fig. 1.Part 2a is used for actual heating.

According to a principal character of the present invention, keep system will restrain each pitch of the laps of 2 by machinery and press each other securely.

Related in this case is one group four be with 5, they are made by the stainless steel cylindrical bar and link to each other with each supporting member that supports to two opposite ends of tube bank.

Be to locate just as seen from Figure 2 with 5 four summits that are arranged in imaginary antiparallelogram.Their end 51 that is arranged in that a side (for the right of Fig. 1 and Fig. 3) locates for example is fixed by welding on the discoid annular plate of being made by stainless steel 30, is formed with opening 300 in the center of this annular plate 30.

At opposite side, be with 5 to be fixed on the end face 3, and this end face 3 had been mentioned in the above corresponding to Fig. 1 and Fig. 3 left side.

In this side, the end with 5 is provided with screw thread; Suitable hole on they pass out around end plate 3.

The nut 500 that is screwed on these threaded portions 50 is under the certain force of strain these bands, thereby forces (from right to left) plate 30 to abut against tube bank 2 last lap, and correspondingly (in an opposite direction), makes end face 3 abut against the first lap of tube bank.

So just make tube bank 2 axial compressions between supporting

member

3 and 30 by active force.

Will be noted that end 50 is longer relatively; They protrude in outside the nut 500 with quite long length, and this just as shown in Figure 3.

The reason that so is provided with why is that parts 50 also play lid 4 centerings and are fixed on effect in the end face 3.

For this reason, formation lid and its diameter are run through by four holes greater than the plate 40 of insulating part 41 diameters, parts 50 can be engaged thus.

Fix and finished by nut 400, this nut preferably uses from locking nut, to reduce particularly to take place unintentionally loosening danger under the effect of vibration.

The annular lip packing 42 that is contained in the suitable groove makes plate 40 the mode of waste gas sealing can be pressed against on the outer surface of end face 3, and its further groove is opened in plate 40.

As appreciable from Fig. 2, be arranged in tube bank 2 periphery with 5.

By observing Fig. 3, can be clear that, by end face 3, with 5 and the assembly that forms of overhang bracket spare 3,30 constituted an independently assembly.

Fully absorb the band of axial thrust load and supporting member and overcome the swelling that is tending towards producing under the effect of pressure in most of in the pipe of winding 2.

This thrust can not be delivered on the housing wall that holds this assembly.

Only by simply the

end

20,21 of pipe is installed in be positioned at housing be used to hold within the shell of these tube banks, tube bank just can be maintained at the interior appropriate position of housing.

Can notice that in addition the separator 8 of deflection is positioned at the top of winding 2 Background Regions, this separator overlaps downwards and partly on the rear portion annular plate 30 along the central opening 300 of rear portion annular plate 30.

This separator advantageously plays the effect that tube bank is remained on enclosure interior.

It is fixed on the inwall of housing and below sleeve pipe 12 extends obliquely.It is preferably arc, and has the profile that forms circular arc, and be centered around tube bank upper area around.

The hot gas that is produced by burner 6 from inside to outside radially passes the gap of pipe then at first through the 2a of first (being positioned at the left side of deflector 7) of tube bank 2.

Because the existence of separator 8, therefore, hot gas can not be overflowed by sleeve pipe 12 at once.

They must be through the rear portion 2b (being positioned at the right of deflector 7) of interchanger, and at this moment, it flows through from outside to inside, with the water preheat that circulates in the tube bank.

At last, cooled gas is overflowed by the rear channels that is limited by wall 110, thereby gets back in the exclusion sleeve 12.

The plastics that constitute housing are selected as resisting about 150 ℃ to 160 ℃ temperature constantly.

The preferred employing based on the synthetic material of strengthening with glass fibre or the sheet glass resin is strengthened.

The resin that is considered to be particularly suitable for type is polyphenylene oxide, polystyrene and polyacrylic synthetic, and this material is suitable for resisting because the chemical attack that the waste gas of heat and condensate cause.

The wall of housing 1 can be thinner relatively, and for example between 2 to 4mm, this is because it does not bear big mechanical stress.

Entering in the front portion of interchanger for the purpose of safeguarding is easily, and the front portion of interchanger is unique parts that really are exposed under the pollution that is caused by waste gas; For this reason, only need nut 400 is unscrewed, and axially will unload by lid 4 and burner 6 formed assemblies fixed thereon.

After cleaning finished, it also was easily that this assembly is installed once more.

These dismountings and assembly operation can not influence by with 5 performed maintenance functions, and described lid is carried out the effective status that instantaneous dismounting can not influence this function.

In a distortion embodiment of this device, discoid deflector 7 can be fixed on the end of burner 6.

In this case, lid 4, burner 6 and deflector 7 have formed can be by the assembly of integral demounting, and this just makes easy inner space to the whole winding that comprises the rear portion of carrying out preheat function clean.

Certainly, suppose such a case, high heat-resisting ring packing must be provided in the entire circumference of flow guiding disc 7, this sealing is bearing on the inner surface of tube bank, thereby prevents that the gas that is in this plane from directly flowing to parts 2b.

In shown second embodiment of the present invention of Fig. 5 to 7,, will run into again and the similar structure of describing just now though device has been rotated 180 ° (facing the right of Fig. 5).

Or similar elements identical with first embodiment has identical Reference numeral, and no longer does again explanation with regard to their character and their function.

Will be noted that this interchanger is compacter more than first embodiment in the axial direction.

As what stated, the rectilinear end of pipe tangentially extends with respect to winding, and their axis is positioned at the fore-and-aft plane (referring to Fig. 6) of identical lateral arrangement.

In addition, with end face 3 over against a side on, be with 5 not to be to be fixed on the annular plate 30, but be fixed on flat rod 30a, the 30b of pair of curved, the core of flat rod is bearing in the angular domain, and the corresponding end rings in this zone has narrow relatively area.

As what seen from Fig. 6, it is square that this moment band is arranged to, and

crooked bar

30a, 30b connecting the sidepiece of band in couples, and this crooked bar is pressed close to two opposed area on the diametric(al) of winding as much as possible.

Can notice (referring to Fig. 5), separator 8 has the groove of being positioned at 80, and this groove is positioned at pipe winding top, in the vicinity of the pipe in the exit of the part 2a that constitutes main switch.

Temperature probe 9 is installed in this groove.

This probe is the thermal cycle breaker, and it is installed hermetically with respect to housing.For this reason, probe 9 preferably remains on the appropriate position by jump ring, and wherein jump ring is cup-shaped of the stainless steel that is installed in groove 80, and this cup shell is to bottom opening, and suitable seal is between the wall of cup shell and groove 80.

This probe links to each other with burner controller, and is designed to surpass the predetermined upper limit when detected temperature, for example 160 ℃ the time, burner cuts out.

Improper overheat condition may unexpectedly appear, for example because anhydrous or manage blocked having only under the situation that a spot of water circulates of causing in pipe in the pipe.

Under the situation that lacks any security measurement device, the temperature that the waste gas of the inner contact of Guan Bingyu plastic casing around the burner may occur leaving rises rapidly.The situation that will take place is that waste gas no longer passes to pipe fully with their heat.

With regard to the mechanical stability of plastics, can go wrong, and can to housing bring badly damaged, and the latter even can initiation fire.

In the distortion shown in Fig. 8, Reference numeral is 9 ' probe comprise temperature-sensitive fusible element 92 '.

The power circuit that flows to boiler be connected on two terminals 90 ' and 91 ' on, these two terminals are by temperature-sensitive element 92 ' link together.

Occur in temperature under the situation of improper rising, when for example surpassing 160 ℃, element 92 ' will melt and cut off two terminals 90 ' and 91 ' between circuit, thereby burner control is closed.

Fig. 9 shows the circulation of the hot gas that is produced by burner 6, and burner is provided with flammable mixture G+A.

After burner was lighted a fire, burner for example produced that temperature reaches 1000 ℃ burning gases, and this gas is with arrow F ₁The direction that is identified is radially outwards advanced.

These burning gases are (arrow F from inside to outside ₂) radially pass the gap in the 2a of interchanger first.

In the process of process, most of heat of burning gases is delivered in the circulation water within it by tube wall, and the temperature that causes leaving the hot gas of tube bank part 2b simultaneously approximately for example is 110 to 140 ℃.

Be that the appearance of deflector 6 has prevented that burning gases F1 from axially overflowing with what notice.

Be cooled to the second portion 2b that at this moment to a certain degree gas pass interchanger ecto-entad then, as arrow F ₃Shown in.

Therefore the other parts of heat are passed in the water that is circulated in the pipe.From device escaping gas (arrow F ₄And F ₅) temperature for example is approximately 65 to 70 ℃.

With regard to water, its temperature is heated to about 80 ℃ usually from room temperature.

Certainly, with respect to waste gas stream, water in the opposite direction flows, and carries out preheating and carry out actual heating in the regional 2b of interchanger in regional 2a.

In the embodiment shown in Figure 10 to 12, interchanger does not have burner.

Housing comprises the inlet sleeve E that is used for hot gas, and these hot gas are from external heat source.

This sleeve pipe is formed on the inside of the winding of pipe 2.

This embodiment also comprises the similar structure of main body with the accompanying drawing 19 that forms aforementioned European patent.

Identical Reference numeral is used to represent the parts identical with first embodiment, is similar when these parts but when inequality, is marked by apostrophe.

Relate to independent interchanger (not preheating) in this embodiment.

Enter into hot gas in the enclose inside space of housing by sleeve pipe E, radially overflow to the outside of tube bank 2 internally, will circulate in the fluid heating in the pipe simultaneously; Cooled gas is overflowed by sleeve pipe 12.

The pipe fitting that constitutes winding can be arranged in parallel, import and outlet header 15 ' play collection and discharging effect with 16 ' respectively import or exports at pipe.

Housing 1 ' be made of plastics.

Mechanically keep similar in the device of tube bank and first embodiment.

They comprise that one group is four band, these bands for example by the end place that is welded on them be fixed to two plates 30 and 3 ' on.

Be positioned on the inlet sleeve E side plate 30 therein the heart have the dish of opening 300, this opening 300 is defined as the gas feed passage by sleeve pipe E simultaneously.

Base plate 3 ' be the dish that does not have cut-off parts.

This dish forces all hot gas to leave by the gap between circle the rear closure of winding.

For the diapire that prevents housing be attached to the plate 3 that is exposed under the hot gas ' on, between these two parts, be provided with gap j.

Certainly, this device also can dispose temperature probe, and this probe is designed to detect when surpassing predetermined temperature when it, stops hot gas to enter.

Return preceding two embodiments, should be noted that the burner that is adopted is not must be cylindrical; It can be pancake or hemispherical, still remains fixed in simultaneously to cover.

But with having identical function its housing is that the similar device that is made of metal is compared, and is approximately 20% by adopting the weight that plastic casing alleviated.

The distortion of the interchanger shown in Figure 13 and 14 on its structure with Fig. 5 to the described embodiment type of Fig. 7, this also be why at this not to the reason of these structures explanations.

But just as will be described, it has comprised the cover of carrying out the heat screen function.

Specifically, the annular element that is looped around the wall of the housing 1 around the winding 2 is equipped with cover 100 integratedly.Cover is made by thin stainless steel substrates, and its thickness for example is approximately and 0.3 arrives 0.4mm.

This cover is bearing on the inner surface of housing, has certain clearance j (referring to Figure 13) simultaneously, and for example this gap is approximately 2mm.This separation realizes by some support columns 101 are provided, thereby this support column is formed and formed to the outstanding projection in the outside of cover by being pressed in small size cup shell in the stainless steel substrates.Shown in Figure 15 and 16, wherein this two width of cloth figure shows the expansion view of stainless steel substrates with two parts, and these projections 101 distribute for how much on the stainless steel substrates surface equably, and in the case, it is arranged and is equilateral triangle.

The existence of space j and projection 101 makes that greatly having reduced the heat that is absorbed by cover 100 is delivered to the possibility that is positioned on its wall all around, and wherein projection 101 in fact goes up with an area supporting on housing 1 with very little zone.

At its place, end, this covers on the front side and abuts against end face 3, and abuts against separator 8-8 ' at opposite side.

Its axial length is marked by mark K at Figure 13, and this axial length equates with winding 2 basically.

In the embodiment illustrated, cover 100 begins to flat mutual separated components forms by two, and these two parts also are being marked by

mark

100a and 100b respectively shown in Figure 15 and 16.

They are that width is that K and length are respectively L ₁And L ₂The band made of stainless steel substrates.

At its longitudinal edge place, it is 4 notch 102 that every

band

100a and 100b have one group, and these notches are essentially semicircle or half elliptic, the shape complementarity of their shape and the cross section of the end of the pipe that is positioned at the horizontal plane place of passing wall 1.

The length L of band 100a ₁Be longer than the length L of band 100a significantly ₂

After the rounded curvature of

band

100a and 100b with the wall that cooperates housing 1, L ₁+ L ₂And approximate (considering space j) greatly they press the girth of the inwall of housing 1 thereon.As what see from Figure 14, this housing has between circular and have a section of the profile between guiding angle square.

Short element 100b is positioned at the opening 20 of pipe ' and 21 ' oriented side, and is positioned at the outside (left side of Figure 14) of these openings, and simultaneously, long element 100a is positioned at opposite side.

They are combined together by their longitudinal edge (being parallel to X-X '), and the end of pipe of winding 2 or the encirclement of opening closely will have been constituted, and provide small gap betwixt by their notch 102, for this reason, notch 102 is constructed suitably and located.

Because they have elasticity, so two bands that stainless steel substrates is made can closely be pressed against on the inner surface of housing by their projection 101, and do not need to adopt special securing member.Therefore, they have formed cover, and this cover intercepts the described inner surface of housing and the hot phase that circulates in the interchanger in the mode of relative sealing, thereby carry out the function of heat screen or constant temperature screen.

In the embodiment just as shown in Figure 13, the wall of housing 1 has inwardly outstanding groove 80, and wherein this groove accommodates temperature probe 9, and so much less this cover is just connected with suitable opening, and recessed wall part just is inserted in this opening.In this zone, therefore, the wall that is not subjected to the housing of heat protection just is exposed to than under the high temperature of the other parts of wall, and the other parts of wherein said wall are by the cover protection.

In fact, because the area that has of this zone is very limited, and the too much heat that herein occurs will be dispersed in the zone of the lower adjacent wall of temperature by the heat transmission, so this any problem can't occur.

The effect that the appearance of cover brings is, the temperature that wall bore of housing about 15 to 20 ℃ have been reduced, therefore compare with the plastics that adopted in the aforesaid embodiment (not having cover), just can adopt not valuable more and corresponding also not expensive more plastics just, and/or just in the longer time, improved the stability and the durability of plastics.

Claims

1. condensate and heat exchanger that links to each other with gas burner or fuel burner (6), it comprises at least one tube bank (2), thereby this tube bank by a pipe or one group with forming of end-to-end layout the pipe of spiral winding form, wherein the wall of individual tubes or many pipes is made by the material of high conductance and is had a flat elliptic jet, the axis (X-X ') of the vertical or vertical substantially described spiral of the main shaft of this section, the width in the gap that two adjacent turns are separated is constant and less than the thickness of described section simultaneously, this tube bank is fixedly mounted in air-locked housing (1) inside, heat exchanger comprises that also being used for circulation will be heated fluid, particularly be positioned at the device of managing or constituting the cold water of the many pipes of restraining (2), this housing (1) has the sleeve pipe (12) that is used to discharge burning gases, like this, this interchanger is arranged to the gap of the hot gas that produced by burner (6) a plurality of circles by separating it and radially or roughly radially passes described tube bank (6), it is characterized in that, on the one hand, described housing (1) is made by heat resistant plastice, and on the other hand, interchanger comprises the device (5 that mechanically described tube bank is remained in its axial direction; 3-30), this device can absorb by circulating in the interchanger and being tending towards making the thrust load that interior pressure produced of the fluid that exchanger wall deforms, and prevents also that simultaneously these load are delivered on the housing (1).

2. interchanger as claimed in claim 1 is characterized in that it comprises the temperature probe (9 that is supported by described housing (1); 9 '), when near the portion temperature being positioned at this probe in the housing surpassed the limit of setting, this temperature probe can be closed burner.

3. interchanger as claimed in claim 1 or 2, it is characterized in that described holding device comprises one group of band (5), it extends in the outside of tube bank (2), is parallel to the axis (X-X ') of spiral, and its end is fixed on the supporting member (3,30) that is pressed against on tube bank two opposite faces.

4. interchanger as claimed in claim 3, the supporting member (3,30) that it is characterized in that being positioned at an end place of this group band be a thin plate, for example is plate-like, its core is cut out, so is ring-type.

5. interchanger as claimed in claim 4, it is characterized in that described plate (3) as partly with the end face of the opening surface of housing sealing, and for example by crimping be fixed on housing around on.

6. interchanger as claimed in claim 5, it is characterized in that with end (50) pass described end face (3) in a little outwards outstanding mode, and these ends are provided with screw thread, thereby they allow lid (4) removably to be installed on the end face by bolt (400).

7. interchanger as claimed in claim 6 is characterized in that described lid (4) is fixed on the burner (6).

8. as each described interchanger in the claim 4 to 7, it is characterized in that having four bands (5) that are square basically and arrange, and be constructed to consistent as much as possible and be pressed against two on its diametric(al) regional relatively arc or curved bel (30a by a pair of with the profile of restraining owing to be positioned at respect to the supporting member of the opposite side of described end face, 30b) form, (30a 30b) is fixed on a pair of adjacent band (5) every band.

9. as each described interchanger of claim 1 to 8, it is characterized in that constituting the synthetic material of plastics for strengthening based on glass fibre or the sheet glass resin is strengthened of housing (1).

10. interchanger as claimed in claim 9 is characterized in that described resin is polyphenylene oxide, polystyrene and polyacrylic compound.

11. as each described interchanger of claim 1 to 10, it is characterized in that it comprises two end-to-end layouts and the coaxial tube bank (2a that is connected with each other, 2b), intrafascicular one of this two coaxial pipe is as main switch, another is as secondary interchanger, diversion component (7) is folded between these two tube banks, and be arranged at first pass through main switch (2a) by the hot gas that burner produces, pass the gap of the circle of separating it from inside to outside, pass secondary interchanger (2b) then, be discharged by described sleeve pipe (12) then.

12. interchanger as claimed in claim 11, it is characterized in that described deflector (7) be fixed on described tube bank (2a, 2b) on.

13. interchanger as claimed in claim 11, it is characterized in that because burner (6) is installed in the inside of described tube bank as main switch (2a), therefore described deflector (7) is discoid and the end that is fixed on this burner, this deflector has the heat insulation sealing at its periphery, and sealing is pressed against the inside of tube bank.

14., it is characterized in that described housing (1) is made up of two and half housings that combine and for example be fixed by welding in together as each described interchanger of claim 1 to 13.

15. as the described interchanger of claim 1 to 14, it is characterized in that it comprises cover (100), this cover is positioned at the inside of the outside and described plastic casing (1) of tube bank (2), and this cover (100) is as heat screen, and it can make this housing and the heat that is discharged by waste gas be isolated.

16. interchanger as claimed in claim 15 is characterized in that described cover (100) made by thin stainless steel substrates.

17. as claim 15 or 16 described interchangers, it is characterized in that described cover (100) is set on the inner surface of plastic casing (1), and make itself and shell inner surface keep certain distance by a series of projections (101) in the wall that for example is compressed on cover (100).

18. as each described interchanger of claim 15 to 17, it is characterized in that the central portion (100a of described cover (100) by two complementations, 100b) form, thus these two parts toroidal shell that has formed on the inner surface that is engaged in described plastic casing combined together.

19. interchanger as claimed in claim 18, it is characterized in that described central portion (100a, 100b) mutually over against the edge have and arrange semicircular in shape or half elliptic groove (102) basically, when these central portions were combined together, these notches closely were enclosed in the individual tubes of formation winding or the straight line end of many pipes.