• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention concerns a domestic heating system (1) and a loading unit (20) therefore. The domestic heating system (1) comprises a solid fuel boiler (2), a storage tank (3) to store heated water, and a loading arrangement (10) interconnecting the two. The loading arrangement (10) comprises a first 3-way valve (15), which is arranged in a supply line (11) and is connected to a shunt line (13), and a second 3-way valve (16), which is arranged in a return line (12) and is connected to the shunt line (13). The first 3-way valve (15) is set to keep the shunt line (13) open and the supply line (11) past the first 3-way valve (15) to the storage tank (3) closed as long as water temperature is below a set first temperature level T1 and to start opening of the supply line (11) past the first 3-way valve (15) to the storage tank (3) as soon as water temperature rises above said first temperature level T1, and the second 3-way valve (16) is set to keep the shunt line (13) open as long as water temperature is below a set second temperature level T2, which is lower than said first temperature level T1, and to start closing of the shunt line (13) and opening of the return line (12) from the storage tank (3) past the second 3-way valve (16) as soon as water temperature rises above said second temperature level T2.
    公开号:SE1650954A1
    申请号:SE1650954
    申请日:2016-06-30
    公开日:2017-12-31
    发明作者:Bengtsson Dan
    申请人:Esbe Ab；
    IPC主号:
    专利说明:

    A DOMESTIC HEATING SYSTEM AND A LOADING UNIT THEREFORETechnical FieldThe present invention concerns a domestic heating system comprisinga solid fuel boiler to heat water, a storage tank to store heated water, and aloading arrangement interconnecting the solid fuel boiler and the storagetank, wherein the loading arrangement comprises a supply line to lead waterfrom a top of the solid fuel boiler to a top of the storage tank, a return line tolead water from a bottom of the storage tank to a bottom of the solid fuel boil-er, a shunt line to lead water from the supply line to the return line, and apump to move water through these lines. Further, the present invention con-cerns a loading unit for use in a domestic heating system according to theinvenfion.
    Prior ArtDomestic heating systems according to the preamble are well known inthe art. One of the problems encountered in such systems is boiler corrosion,which is promoted when boiler temperature is below about 60°C. This is onereason for use of a loading arrangement, which, when starting to fire the boil-er, by keeping lines to the storage tank closed can ensure that boiler tem-perature rises quickly to a temperature above about 60°C. Once the tempera-ture in the boiler has risen above about 60°C, one usually starts loading of thestorage tank with heated water from the boiler. This however leads to returnof cold water from the storage tank to the boiler, which thereby risks to cooldown below the desired about 60°C, especially since the storage tank usuallyholds a much greater volume of water than the boiler itself. Hence, at leastinitially flow of heated water to the storage tank, and thus return of cold waterfrom the storage tank to be boiler, has to be throttled until temperature of wa-ter in return from the storage tank to the boiler reaches a level, which is nolonger harmful to the boiler from a temperature point of view.
    Another problem encountered in domestic heating systems accordingto the preamble is that loading of the storage tank with heated water tends tobe ineffective if done the wrong way. Usually a storage tank has a rather largecapacity, such as for instance 500 l, and requires long time to be heatedthroughout. Therefore one usually strives to achieve so-called thermal stratifi-cation, which requires a gentle circulation of water between the boiler and thestorage tank such that different temperatures are preserved between top andbottom regions of the storage tank.
    From the above it is apparent that in domestic heating systems of thetype in question bad control either of a return temperature to a boiler or of atemperature in a top region of a storage tank tends to deteriorate operation ofa domestic heating system.
    Obiect of the lnventionln the light of the above it is an object of the invention is to mitigate theprior art problems by improving a domestic heating system according to thepreamble thus that temperatures inside the domestic heating system are bet-ter controlled and thereby the operation of the entire system is improved.
    A further object of the invention is to provide an improved loading unitfor such a system.
    Brief Summary of the lnventionAccording to the present invention in a heating system according to thepreamble the known problems are mitigated in that the loading arrangementfurther comprises a first 3-way valve, which is arranged in the supply line andis connected to the shunt line, and a second 3-way valve, which is arrangedin the return line and is connected to the shunt line, wherein both 3-wayvalves are thermally controlled, wherein the first 3-way valve is set to keepthe shunt line open and the supply line past the first 3-way valve to the stor-age tank closed as long as water temperature at the first 3-way valve is belowa set first temperature level T1 and to start opening of the supply line past thefirst 3-way valve to the storage tank as soon as water temperature at the first3-way valve rises above said first temperature level T1, and wherein the se-cond 3-way valve is set to keep the shunt line open as long as water tempera-ture at the second 3-way valve is below a set second temperature level T2,which is lower than said first temperature level T1, and to start closing of theshunt line and opening of the return line from the storage tank past the se-cond 3-way valve as soon as water temperature at the second 3-way valverises above said second temperature level T2.
    By means of the first 3-way valve, at low water temperatures, water isled through the shunt line back to the boiler instead of to the storage tank,which leads to quick heating of the boiler when fired up. Once a water tem-perature sufficiently high to prevent corrosion has been reached inside theboiler, such as for instance 60°C, the second 3-way valve allows a minor flowfrom a bottom part of the storage tank to the boiler, by which a return watertemperature to the boiler is lowered to a level, that ensures that an apprecia-ble temperature difference is upheld between bottom and top parts of theboiler, which promotes quick heating. When under these circumstances thewater temperature inside the boiler has risen to for instance 80°C, the first 3-way valve opens towards the storage tank. By this actual loading of the stor-age tank with heated water starts, however with a throttled return to the boilerthanks to the second 3-way valve. This promotes stratification inside of thestorage tank and keeps water in return to the boiler at a temperature levelsufficiently high to maintain corrosion safe conditions inside the boiler but suf-ficiently low to uphold said appreciable temperature difference. Finally, oncethe water temperature even in a bottom region of the storage tank has risenabove for instance 60°C, the second 3-way valve opens fully between thestorage tank and the boiler, thereby blocking the shunt line and equalizingtemperatures inside the boiler and the storage tank on a level above for in-stance 80°C. Thus, thanks to the invention temperatures inside a domesticheating system can be better controlled than before, which leads to a majorimprovement of the overall operation of the system.ln the domestic heating system said first temperature level T1 is fromabout 75 to 85°C, and preferably 80°C, wherein said second temperature lev-el T2 is from about 55 to 65°C, and preferably 60°C. These temperature lev-els have proven to be suitable in order to achieve optimum heating condi-tions.
    Preferably the pump is arranged in the return line between the second3-way valve and the solid fuel boiler. By this the pump is kept at the lowestpossible temperature which is beneficial to life.
    Preferably, in the domestic heating system the 3-way valves form anintegrated part of a loading unit comprising a housing. By providing a unit in-tegrated in a housing install is simplified both when it comes to plumbing andadjustment.
    According to an alternative in the domestic heating system the pumptoo forms an integrated part of the loading unit, thereby simplifying install.
    Preferably, in either one of the above two cases the housing of theloading unit is thermally insulated. The insulated housing can simply compriseof two halves, which are made of expanded plastics and encapsulate the en-tire loading unit, thus that heat leakage is avoided.
    According to one embodiment in the domestic heating system theshunt line comprises interconnected valve flanges of the 3-way valves. By thisno extra pieces of pipe have to be provided, which simplifies install and savesspace.
    According to a preferred embodiment, in the domestic heating systemthe first 3-way valve, in order to cope with water volume changes, below saidfirst temperature level T1 is set to uphold a leak flow in the supply line be-tween the solid fuel boiler and the storage tank. By providing a leak flow noextra measures, such as installing an extra expansion vessel, have to be un-denaken.
    The invention does also concern a loading unit for use in a domesticheating system according to the invention, wherein the loading unit comprisessaid first 3-way valve, said second 3-way valve and a housing, in which thevalves are integrated. By providing such a unit install is simplified considera-bly.
    According to an alternative embodiment the loading unit comprisessaid pump too. This does also simplify install.
    According to a further embodiment the pump too can be integrated inthe housing of the loading unit, which also renders install easier.
    Finally, the housing of the loading unit can be thermally insulated,which serves energy.
    Brief Description of the Drawinqsln the drawings a preferred embodiment of a domestic heating systemaccording to the invention is shown schematically, whereinFig. 1 shows a boiler and a storage tank, which are interconnected bymeans of a charging arrangement, andFigs. 2a-c illustrate different settings of 3-way valves of the chargingarrangement.
    Detailed Description of the Preferred Embodimentln the following the preferred embodiment of the invention is describedwith reference being had to the accompanying drawings, in which like refer-ence numbers denote like parts.ln fig. 1 a domestic heating system according to the preferred embodi-ment is generally denoted 1. As the drawings are schematic, not all parts ofthe domestic heating system 1 are shown, such as lines leading to radiatorsor water taps.
    The shown domestic heating system 1 comprises a solid fuel boiler 2,that is a boiler which is fired by means of a solid fuel, such as wood, whichdoes not permit temperature adjustment by throttling in the way that for in-stance oil or gas allow. Hence, to achieve high efficiency and to provide forburning at temperatures sufficiently high from an environmental point of view,the boiler 2 is connected to a storage tank 3 by means of a charging ar-rangement generally depicted 10. The storage tank 3 can take up excessiveheat from firing and store it for use when firing has ceased.
    The charging arrangement 10 comprises a supply line 11, which is tolead water from a top of the boiler 2 to a top of the storage tank 3, and a re-turn line 12, which is to lead water from a bottom of the storage tank 3 to abottom of the boiler 2. Further, the charging arrangement 10 comprises ashunt line 13, which is to lead water from the supply line 11 to the return line12, and a pump 14, which is to move water through lines 11-13 and is ar-ranged in the return line 12 close to the boiler 2.ln the charging arrangement 10 a first 3-way valve 15 is arranged inthe supply line 11 and is connected to a top end of the shunt line 13, and asecond 3-way valve 16 is arranged in the return line 12 between the storagetank 3 and the pump 14 and is connected to a bottom end of the shunt line13.
    As can be seen, in the preferred embodiment the shunt line 13 actuallycomprises interconnected valve flanges of the 3-way valves 15, 16, whichrenders install particularly easy. Further it can be seen that both 3-way valves15, 16 are integrated in a common housing 17, which preferably is thermallyinsulated. By this install is rendered even more easy and heat leakage limited.
    Now, with reference being had to figs. 1 and 2a-c, function of the do-mestic heating system 1 as well as some temperature data is revealed,wherein in the bottom parts of figs. 2a-c thick, thin, dashed and crossed overarrows are used to illustrate a large flow of water, a throttled flow of water, aleak flow of water and a stopped flow of water, respectively.
    The first 3-way valve 15 is thermostatically controlled (other thermalcontrol means, such as electronic ones, are of course possible) and set tokeep the shunt line 13 open and the supply line 11 past the first 3-way valve15 to the storage tank 3 closed as long as water temperature at the first 3-way valve 15 is below a set first temperature level T1 of preferably 80°C (cf.fig. 2a) and to start opening of the supply line 11 past the first 3-way valve 15to the storage tank 3 as soon as water temperature at the first 3-way valve 15rises above said first temperature level T1 (cf. fig. 2c). Further, in order tocope with water volume changes the first 3-way valve 15, below said firsttemperature level T1 is set to uphold a leak flow in the supply line 11 betweenthe solid fuel boiler 2 and the storage tank 3.
    The second 3-way valve 16 is thermostatically controlled (other thermalcontrol means, such as electronic ones, are of course possible) and set tokeep the shunt line 13 open as long as water temperature at the second 3-way valve 16 is below a set second temperature level T2 of preferably 60°C(cf. fig. 2a), that is lower than said first temperature level T1 of preferably80°C, and to start closing of the shunt line 13 and opening of the return line12 from the storage tank 3 past the second 3-way valve 16 as soon as watertemperature at the second 3-way valve 16 rises above said second tempera-ture level T2 (cf. figs. 2b-c) until the shunt line 13 is fully closed and the linefrom the storage tank 3 to the boiler 2 is fully open.
    The advantages of the domestic heating system 1 according to thepresent invention have been described explicitly in the introductory part of theapplication. They comprise quick heating of the boiler 2, keeping of watertemperature inside the boiler 2 on a sufficiently high level even while loadingstorage tank 3 with heated water, and promoting of stratification inside of thestorage tank 3. Hence the present invention renders it possible to optimallycontrol temperatures inside the entire domestic heating system 1, which bet-ters the overall operation thereof.
    权利要求:
    Claims (12)
    [1] 1. A domestic heating system (1) comprising a solid fuel boiler (2) to heat wa-ter, a storage tank (3) to store heated water, and a loading arrangement (10)interconnecting the solid fuel boiler (2) and the storage tank (3), wherein the loading arrangement (10) comprises a supply line (11) tolead water from a top of the solid fuel boiler (2) to a top of the storage tank(3), a return line (12) to lead water from a bottom of the storage tank (3) toa bottom of the solid fuel boiler (2), a shunt line (13) to lead water from the supply line (11) to the returnline (12), and a pump (14) to move water through these lines (1 1-13),c h a r a c t e r i z e d in that the loading arrangement (10) further comprises a first 3-way valve (15), which is arranged in the supply line (11) and isconnected to the shunt line (13), and a second 3-way valve (16), which is arranged in the return line (12) andis connected to the shunt line (13), wherein both 3-way valves (15, 16) are thermally controlled, wherein the first 3-way valve (15) is set to keep the shunt line (13)open and the supply line (11) past the first 3-way valve (15) to the storagetank (3) closed as long as water temperature at the first 3-way valve (15) isbelow a set first temperature level T1 and to start opening of the supply line(11) past the first 3-way valve (15) to the storage tank (3) as soon as watertemperature at the first 3-way valve (15) rises above said first temperaturelevel T1, and wherein the second 3-way valve (16) is set to keep the shunt line (13)open as long as water temperature at the second 3-way valve (16) is below aset second temperature level T2, which is lower than said first temperaturelevel T1, and to start closing of the shunt line (13) and opening of the returnline (12) from the storage tank (3) past the second 3-way valve (16) as soonas water temperature at the second 3-way valve (16) rises above said secondtemperature level T2.
    [2] 2. The domestic heating system (1) according to claim 1, wherein said firsttemperature level T1 is from about 75 to 85°C, and preferably 80°C, andwherein said second temperature level T2 is from about 55 to 65°C, and pref-erably 60°C.
    [3] 3. The domestic heating system (1) according to claim 1 or 2, wherein thepump (14) is arranged in the return line (12) between the second 3-way valve(16) and the solid fuel boiler (2).
    [4] 4. The domestic heating system (1) according to any one of claims 1-3,wherein the 3-way valves (15, 16) form an integrated part of a loading unit(20) comprising a housing (17).
    [5] 5. The domestic heating system (1) according to claim 4, wherein the pump(14) too forms an integrated part of the loading unit (20).
    [6] 6. The domestic heating system (1) according to claim 4 or 5, wherein thehousing (17) of the loading unit (20) is thermally insulated.
    [7] 7. The domestic heating system (1) according to any one of the previousclaims, wherein the shunt line (13) comprises interconnected valve flanges ofthe 3-way valves (15, 16).
    [8] 8. The domestic heating system (1) according to any one of the previousclaims, wherein the first 3-way valve (15), in order to cope with water volumechanges, below said first temperature level T1 is set to uphold a leak flow inthe supply line (11) between the solid fuel boiler (2) and the storage tank (3).
    [9] 9. A loading unit (20) for use in a domestic heating system according to anyone of the previous claims, c h a r a c t e r i z e d in comprising said first 3-way valve (15), said second 3-way valve (16) and a housing (17), in which thevalves (15, 16) are integrated.
    [10] 10. The loading unit (20) according to claim 9, comprising said pump (14) too.
    [11] 11. The loading unit (20) according to claim 10, wherein the pump (14) is in- 5 tegrated in said housing (17) too.
    [12] 12. The loading unit (20) according to any one of claims 9-11, wherein said housing (17) is thermally insulated.
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    引用文献:
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    CH538076A|1972-05-05|1973-06-15|Lins Albert|Control device for a central heating system|
    DE2731922A1|1977-05-06|1978-11-09|Elesta Ag Elektronik|PROTECTIVE CIRCUIT AGAINST LOW TEMPERATURE CORROSION OF THE BOILER|
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    ITMI20140268U1|2014-09-01|2016-03-01|Pettinaroli Flii Spa|BY-PASS VALVE AND HYDRAULIC GROUP INCLUDING SUCH VALVE|
    CN204477390U|2015-03-16|2015-07-15|成都美景舒适家居有限公司|A kind of multiplex pipeline band bypass composite joint assembly|
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    法律状态:
    优先权:
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    SE1650954A|SE541988C2|2016-06-30|2016-06-30|A domestic heating system|SE1650954A| SE541988C2|2016-06-30|2016-06-30|A domestic heating system|
    EP17178100.8A| EP3264007B1|2016-06-30|2017-06-27|A domestic heating system and a loading unit therefore|
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