CN104114952B

CN104114952B - Housing unit for heater

Info

Publication number: CN104114952B
Application number: CN201380009806.0A
Authority: CN
Inventors: B·多辛; S·S·延森
Original assignee: Grundfos Holdings AS
Current assignee: Grundfos Holdings AS
Priority date: 2012-02-17
Filing date: 2013-01-17
Publication date: 2017-03-15
Anticipated expiration: 2033-01-17
Also published as: WO2013120649A1; CN104114952A; PL2629019T3; EP2629019A1; EP2629019B1

Abstract

The present invention relates to a kind of housing unit for heater, the heater has two heating cycles, one heating cycle is used for indoor heating, one heating cycle is heated for undrinkable water, the housing unit has pump case (26), pump case has chamber (29) in suction side, two reflux lines (12, 13) it is passed through in the chamber, the reflux line is by the switch element (34 being disposed therein, 35) suction side relative to pump is alternately closed, here, reflux line (12, 13) the angle α between 60 ° and 120 ° is surrounded in its region through chamber wall.

Description

Housing unit for heater

Technical field

The present invention relates to a kind of housing unit for heater, the heater is with two heating cycles, a heat supply Circulate for indoor heating, a heating cycle is heated for undrinkable water, the housing unit has pump case, the pump case Body has chamber in suction side, and two reflux lines are passed through in the chamber, and the reflux line is by the switch being disposed therein Element is alternately closed relative to the suction side of pump.

Background technology

Well known there are this housing unit for heater, typically wall-hanging gas-fired heater a variety of structures to become Change.The core of this structure is pump all the time, one or the other heating cycle is connected with main heat exchanger pipeline Reversal valve and for undrinkable water heating heat-exchangers of the plate type.Additionally, being generally additionally provided with bypass duct, vent, limit Pressure valve, sensor (such as piezometer, effusion meter etc.) and other components.Higher independent in order to avoid producing for above-mentioned component Stringing expense, is that this housing unit is generally by synthetic material injection mo(u)lding using so-called housing unit in the prior art Part is made, and which not only receives the conduit coupling between component, also receives most component.

A kind of such housing unit is understood by patent documentation EP 2397777A1.The housing unit is arranged to be connected to The connection terminal of heat-exchangers of the plate type is to upper, and is arranged on before heat-exchangers of the plate type in the mounted state.It is arranged so as to Advantage is that width is relatively small, but depth is relatively large.The shortcoming of this structure type is that heat-exchangers of the plate type is only being incited somebody to action Housing unit is just approached after removing, and this can cause too high cost of labor when heat-exchangers of the plate type is changed in maintenance.

Content of the invention

In this context, it is an object of the invention to proposing a kind of housing unit, which on the one hand can be with small number of Individually compact structure realized by stringing, and the replacing of heat-exchangers of the plate type on the other hand can also be made simple as far as possible.

The purpose of the present invention realizes that by a kind of housing unit for heater there are the heater two heat supplies to follow Ring, a heating cycle are used for indoor heating, and a heating cycle is heated for undrinkable water, and the housing unit has pump case Body, the pump case have chamber in suction side, and two reflux lines are passed through in the chamber, and the reflux line is by being arranged at Switch element therein is alternately closed relative to the suction side of pump, and wherein, the reflux line passes through chamber wall at which The angle α between 60 ° and 120 ° is surrounded in region.The preferred embodiment of the present invention other parts, the following description with And be given in accompanying drawing.

Housing unit according to the present invention is used for the heater with two heating cycles, and one of heating cycle is used for Indoor heating, another heating cycle are heated for undrinkable water, and the housing unit has pump case, and the pump case is in suction side There is chamber, there are two reflux lines to be passed through in the chamber, the two reflux lines can be first by the switch being disposed therein Part is alternately closed relative to the suction side of pump.The two reflux lines are set to according to the present invention, are passing through them Each other in the angle between 60 ° and 120 ° in the region of chamber wall, i.e., reflux line is preferably made to be similar to each other vertically, so that Reflux line, the reflux line particularly for the heating cycle of indoor heating can be passed through from bottom side, and another reflux line It is passed through from side.Heat-exchangers of the plate type can be realized by this housing unit and the housing unit with pump is arranged side by side, this Sample just can change heater in heat-exchangers of the plate type when need not first remove housing unit.According to the embodiment of the present invention Advantage also reside in the housing unit that can realize structure closely, this causes the structure of heater to there was only the structure depth of very little Degree.

The basic thought of the present invention is, is to make reflux line through in the region of chamber wall by housing unit design The angle between 60 ° to 120 ° is surrounded, i.e., is preferably similar to perpendicular to one another.Generally from following introduce heater, be used for room The reflux line of interior heat supply almost can be directly connected between on housing unit.By being used for the backflow of indoor heating relative to this Heat supply for undrinkable water heating that pipeline is arranged with the angle of the angle between 60 ° to 120 °, preferably approximate 90 ° is followed A kind of reflux line of ring, it is possible to achieve laterally disposed, this laterally disposed side for allowing to be set directly at heat-exchangers of the plate type Side, here, the connection for heat-exchangers of the plate type can be realized by housing unit itself or preferably by middle casing.By This suitably can realize connection in installation site from below, so as to hand over from board-like heat is above removed under service mode Parallel operation, without removing housing unit or possible middle casing.

Pivot centers orientation (orientieren) of the angle α preferably about impeller of pump.Additionally, the suction is passed through by reflux line The chamber for entering side has switch element, by the switch element can alternately closing volume pipeline so that in suction side On the one hand the space formed in chamber can be used as valve chest, on the other hand can also realize calmness in the interior volume Flowing is separated with gas, thus, is led to when the top (Oberseite) of the chamber being for example close in installation site arranges to have During the air bleeding valve of the entrance of surrounding, chamber also advantageously forms a part for air separator.

On the one hand in order to the function of valve is realized in chamber interior, be on the other hand conducive to tool technique also for offer one kind The housing unit that ground is constituted, according to a kind of preferred expansion scheme of the present invention, constitutes return duct in chamber interior using pipeline section Road, these pipeline sections are preferably at least configured to straight in the region of chamber, and are similar to arrange perpendicular to each other, so that it At least internally can by cast core (Ziehkernen) formed.

Here, it is preferred that the free end of the pipeline section being passed through in chamber to be set to each other, making the ring in tube section ends Shape end face is abreast arranged toward each other, preferably.The advantage be arrangeding in parallel is, positioned at the setting of the switch element between them Equally abreast can realize.Alternatively, switch element can also be constituted using the wedge-type seal face that erects at an angle to each other.? This is pointed out that the inclination of tube section ends correspondingly should be realized each other, such that it is able to according to circumstances using switch element Close tube section ends or another tube section ends.

Here, it may be preferred to which the connection end for reflux line is set directly at pump case, is particularly chamber, The connection end of the reflux line of the heating cycle for indoor heating, in installation site, is suitably arranged on pump case by this Below, and the connection end of the reflux line of the heating cycle for undrinkable water heating is arranged on the side of pump case.Peace Especially with regard to exhaust pump arrangement all the time by air separator limiting, the air separator and its air bleeding valve are arranged holding position In the upper area of chamber.

In the housing unit according to the present invention, chamber constitutes a part for air separator.Air separator is arranged A part especially as chamber in the suction side region of pump be particularly advantageous, but air separator can also be arranged In other positions, it can also be arranged on outside housing unit as needed.

According to a kind of preferred expansion scheme of the present invention, switch element has lever, an end configuration of the lever There is seal, the seal band is arranged between tube section ends with a gap, here, lever is pivotally supported at surrounds chamber Wall portion in, the other end of lever with control driving means be connected.In the region of wall portion, not only realize propping up lever Hold, also realize that the sealing to lever, this sealing can be realized by sealing ring by sealing member or preferably.Here, can be Seal is set on the end of lever, and the seal alternately seals pipeline section using two sides each other in about 180 ° of settings Side end.But two special seals towards lever both sides, one of seal can also be set on end For the end face of a pipeline section, and another seal is used for the end face of another pipeline section.Control driving means are located at pump case Liquid guide portion outside, and can be accessible from the outside in the case where lever is not dismantled and be replaced.

Such switch element is considered prior art.Such as patent documentation with reference in the present invention simply Related content in EP2397777A1, has been carried out to this switch element with control driving means in the publication in detail Explanation.

Particularly in the aforesaid housing layout being arranged on heat-exchangers of the plate type beside housing unit, preferably will control Driving means are arranged on the side back to motor of pump case.On the one hand and control in such layout, motor Driving means are arranged on all the time generally each other in 180 ° of opposite both sides, and therefore, control driving means and motor are around positioned at it Between housing unit.Control driving means are particularly preferably arranged in installation site here the dorsal part of pump case, because On the one hand economical space saving can place for controlling driving means here, on the other hand generally come-at-able, therefore when logical Often in order to catch housing unit later and when there is enough free spaces in side (for example in upside), can be not Dismounting be located at dorsal part housing unit in the case of change control driving means.

When the axial direction from impeller is observed, pump case has substantially rectangular cross-sectional configuration outline, such as generally when bag When including motor head and being fixed in pump case by four screws, foursquare profile can be formed by annular shape, be that this is special Lever is not preferably made to arrange with regard to the rectangle outline diagonal, because lever diagonally can have than other settings more Big length, without protruding past the outline of housing.

Suitably, the dorsal part in pump case is provided with connection sleeve pipe, for making lever be combined as a whole with pump case, and can So that lever is installed in connection sleeve pipe together with the wall portion of supporting lever.This company for alternatively laying switch element Female connector pipe is considered prior art, and which has been described in detail in patent documentation EP 2397777A1 and has been illustrated.

It is preferred that by the housing unit design according to the present invention and being set to, which is located at the side of the narrow side of heat-exchangers of the plate type Side, and turned on by reflux line and the heat-exchangers of the plate type for undrinkable water to be heated, mechanically connected, here is preferred Configuration middle casing, for by mechanical to housing unit and heat-exchangers of the plate type, be conductively connected.The middle casing can also be constituted A part for housing unit.

It is preferred that housing unit to be configured to, pump case is one in its rectangle that observes along the axial direction of impeller outline Aspect by pressure sleeve protrude from installation site when top on, be on the other hand higher by air bleeding valve.Such arrangement It is suitable, because on the one hand air bleeding valve should be arranged on the peak of pump as much as possible, on the other hand also needs to pressure sleeve The pipeline for being directed upwardly into main heat exchanger in the heater guided into by pipe, by burner by primary in the main heat exchanger The water heating of heating cycle.In such an arrangement, it is possible to use in contour area, therebetween free space is arranging Control driving means for switch element.Advantage of this arrangement is that：On the one hand control driving means are arranged at generally may be used On the position for tapping into, on the other hand it is located in the space that cannot also use anyway.

It is preferred that housing unit there is passage, the passage will use in the case where centre is connected with bypass valve inside pump case It is connected with chamber in the reflux line of the heating cycle of undrinkable water heating.Additionally or alternatively, the passage can with The reflux line of the heating cycle for undrinkable water heating is connected with surrounding in the case of middle connection limited valve Connect, i.e. between reflux line and chamber, on the one hand constitute bypass connection, to guarantee to close in the heating cycle for indoor heating Blood circulation is able to maintain that when closing, the connection with surrounding is realized by pressure limiting valve on the other hand, to guarantee more than predetermined The decompression of external environment can be realized during pressure by the pressure limiting valve, thus by the component inside removal system due to excessive Pressure rise and occur rupture or other failures danger.It is preferred that this passage by chamber wall in profiled member (Einformung) Constitute, here, it is preferred that the profiled member is abreast arranged with being used for receiving the profiled member of air bleeding valve, so that the profiled member can Internally formed using cast core in an identical manner.Here, the profiled member is introduced into be connected to non-drinking for be heated In pipeline section on the reflux line of water, i.e., streamwise is located in the region before switch element.

Here, the pipeline connection between passage and chamber can be constituted simply by the wall middle punch in profiled member. Flow optimized is unimportant here, because in normal operation and not needing bypass duct to bypass.It is preferred that make bypass valve with Profiled member is combined as a whole, i.e. perforation is bypassed valve closure, and just open perforation after bypass valve is opened.It is preferred that pressure limiting valve Also it is combined as a whole with profiled member, which is suitably insert molded in part in the form of magazine (Patrone), thus in profiled member On free end only for test operation handle and the outlet that is preferably orientated in installation site backward outwardly.

It is preferred that be integrally configured to synthetic material injection molding part according to the housing unit of the present invention, it is possible thereby to pass through to criticize Measure and produce the collecting part for being used as the aforementioned components and other components possible of heater at low cost, and required for simultaneously constituting Connecting pipe.

Description of the drawings

The invention will be further described for shown embodiment with reference to the accompanying drawings.Wherein：

Fig. 1 illustrates the hydraulic circuit of the heating equipment with heater in a very simplified schematic overview,

Fig. 2 shows housing unit with connected heat-exchangers of the plate type and middle casing in installation site Top view,

Fig. 3 shows the rearview of component as shown in Figure 2 in installation site,

Fig. 4 shows the side view of housing unit, and

Fig. 5 shows the amplification sectional view of housing unit as shown in Figure 3.

Specific embodiment

Heating equipment as shown in Figure 1 has two heating cycles, and one is used for indoor heating, and one is used for undrinkable water Heating.The heating equipment includes actual heater, and the heater can be the vertical heating of wall-hanging gas-fired heater or floor Device.In FIG, the part of heater side includes the part of the heating equipment above dotted line 0, and remaining housing side Part includes the part of the heating equipment below dotted line 0.

There is heater four water pipe connection ends for occurring in heater bottom side, i.e. heat supply to begin to flow connection end (Heizungsvorlaufanschluss) 1, hot reflux connection end 2, cold water connection end 3 and hot water connection end 4 are supplied.Other (gas, electricity) connection end is not shown.On the one hand the heater is used for what supply was for example heated for indoor heating and undrinkable water Heater (Radiator) form exchanger 5.For this purpose, being provided with heat-exchangers of the plate type 6 in heater body, lead to Crossing the heat-exchangers of the plate type is carried out being heated and fed to hot water connection end 4 to the cold undrinkable water from cold water connection end 3.This Plant to heat and realized by the hot water for for example being produced by gas combustion in main heat exchanger 7 in the heater, the hot water quilt Guiding adverse movement passes through heat-exchangers of the plate type 6.

In order that hot bearing medium (typically water) realizes following by main heat exchanger 7 and secondary heat exchanger 5 and 6 Ring, arranges the circulating pump 8 of wet operation centrifugal pump form.Hot bearing medium is delivered to main heat by pressure pipeline 9 and is handed over by circulating pump 8 Parallel operation 7, hot bearing medium are heated here, then or by pipeline 10 are delivered to heat-exchangers of the plate type 6, or by pipe Road 11 is delivered to heat supply to be begun to flow connection end 1, and is delivered to the heat exchanger 5 for indoor heating from heat supply beginning stream connection end 1.From Heat exchanger 5 and 6 flow out medium by for convey come the reflux line 12 of the water of automatic heat-exchanger 5 and for conveying from The reflux line 13 of the water of heat exchanger 6 is transported to reversal valve 14, the reversal valve according to on-position make reflux line 12 or Reflux line 13 is connected with the suction side of pump 8.

By the such control reversal valve 14 of motor 15：Reflux line 12 is made to be connected with pump 8 in operation.When should subtract When lacking the hot water at the undrinkable water leading position, hot water is detected using flow transducer 16, and pass through Electronic control driving means 15 switching control valves 14, so that reflux line 13 is connected with the suction side of pump 8.

Additionally, heater has bypass duct 17, even if in order to guarantee when two heating cycles are all closed also can be Heater body is circulated.Here, pressure limiting valve 18 is combined as a whole with bypass duct 17 as bypass valve, the pressure limiting valve is reaching It is opened during to default pressure reduction.Additionally, heater also has other components, schematically illustrate at this therein flat Weighing apparatus container 19, relief valve 20 and air bleeding valve 21.

In order that the assembling of heater, particularly mounted inside and install and later maintenance process in heater The stringing in portion is more prone to, and arranges the housing unit 22 for being configured to integrated synthetic material injection molding part.

Housing unit 22 illustrates in Fig. 2 to Fig. 5 and is described in detail below, its particularly in Fig. 2 and Be removed in Fig. 3, the housing unit is arranged on the side of heat-exchangers of the plate type 6, the heat-exchangers of the plate type in installation site with Wall is abreast arranged, and is arranged on together with housing unit 22 on the bottom 23 of heater housings so that the bottom of heater housings Side can cover connection end 1-4.

In shown embodiment, heat-exchangers of the plate type 6 is set to, after two fixed screws are unclamped, Do not remove housing unit 22 or the middle casing 24 and 25 that is connected on heat exchanger 6 in the case of just can be by board-like heat exchange Device 6 is removed forward, and this will cause heater to be especially susceptible to safeguard, because especially for can not exclude board-like heat for hard water Exchanger 6 prematurely can break down.

22 one side of housing unit includes pump case 26, and the pump case is arranged on peace to be connected with motor 27 Dress side is provided with impeller on motor reel towards side above, and impeller is rotatably arranged in the pump for spiral shaped housing In housing 26, hot bearing medium is transported to from suction inlet by upwardly extending pressure sleeve 28 in installation site in this place Pipeline 9.Chamber 29 of the pump case behind suction side, i.e. space in installation site for impeller with tank shape, and There is in bottom side in installation site the connection end of the reflux line 12 for indoor heating, the connection end here to be designed to heat supply Backflow connection end 2.Additionally, chamber 29 exactly has in the left side towards heat-exchangers of the plate type 6 in installation site in side There is connection end 30, the connection end 30 is connected with middle casing 24 and receives the reflux line 13 of heat-exchangers of the plate type 6.Radially Chamber wall 29 in be provided with perforation for connection end 2 and 30, the perforation the inside of chamber 29 by pipeline section 31 and 32 around or Continue to extend, these pipeline sections lead to conduit connection end in the inside of chamber 29.In the present embodiment, use in radial direction chamber wall It is 90 ° that perforation in connection end 2 and 30 is arranged to angle α to each other, here, the quilt in radial direction chamber wall of laterally attached end 30 It is set to moveable part downwards.

Pipeline section 31 and 32 is configured to incline in its free end so that their annular end face 33 facing with each other and that This is abreast arranged, as shown in Figure 5.Pipeline section 31 and 32 can alternately be closed by switch element, the switch element is by lever 34 are constituted, and the lever is swingably conducted through chamber wall, and the inner end in the lever is provided with seal 35, the seal The free end of the free end or pipeline section 32 of pipeline section 31 is closed or is opened according to lever positions.The lever being located at outside chamber 29 End is connected with control driving means 15, and the control driving means are perpendicularly arranged with lever 34.The longitudinal axis of lever 34 The angle at 45 ° with the horizontal line of pump case 26 or bottom side in installation site, i.e. lever 34 is with regard to along the axial direction side of impeller axle Substantially square pump case 26 is observed to (50) diametrically to arrange, the dorsal part being specifically provided in inside chamber 29 On.For this purpose, forming corresponding connection end 36 on dorsal part, wherein, lever 34 is swingably supported on wall therein with lever 34 It is combined as a whole 37 cartridge type of portion.Vertically disposed control driving means 15 are protruded from pump case 26 in upside, and Axial direction 50 along impeller is observed, and the control driving means are located at pressure sleeve 28 and there is air bleeding valve 21 or be located at behind Relief valve 20 air separator 38 between.It is combined as a whole with the profiled member 40 in chamber wall 20 cartridge type of relief valve, The profiled member is passed through in pipeline section 31 in side, and the pipeline section 31 constitutes the reflux line of heat-exchangers of the plate type 6, and passes through profiled member 40 Wall in recess 41 be connected with the inside of chamber 29.Pressure limiting valve 18 is incorporated to as bypass valve in tube side in profiled member 40, Relief valve 20 is connected with above it, and when predetermined pressure is exceeded, relief valve 20 is by recess 41 by inside chamber 29 and surrounding Environment is connected.

Chamber 29 not only includes reversal valve 14, is also simultaneously used for separating air in the region before suction inlet, and in upside It is provided with the air separator 38 with air seperating vale 21.

A pair of conduit connection ends of 24 connecting plate type heat exchanger 6 of middle casing, and heat-exchangers of the plate type 6 is another to pipe Road connection end connects middle casing 25.Particularly as shown in figure 5, middle casing 24 by the connection end 30 of housing unit 22 with board-like The lower connection end of the connection end pair for being located at the right dorsal part in installation site of heat exchanger 6 couples together.Upper connection end 6 is outside Lead to conduit connection end.Middle casing 25 is connected to another dorsal part connection end of heat-exchangers of the plate type 6 to upper, and leads in heating Heat supply on the bottom 23 of device is begun to flow connection end 1 and hot water connection end 4.

In the word of the representation space for above being used, for example forward and backward, upper and lower and side is set according to such all the time Put：In the present arrangement, heater is for example, be mounted on wall, and the bottom 23 of heater is horizontally set, and to install be from this Place upwardly extends.Viewing angle with generally the same in the heater be situation based on fore shell body wall opening all the time, here, housing Back wall be arranged at install having heaters wall on.

Reference numerals list

Horizontal line in 0 Fig. 1

1 heat supply is begun to flow connection end

2 supply hot reflux connection end

3 cold water connection ends

4 hot water connection ends

The heat exchanger of 5 indoor heatings

6 heat-exchangerss of the plate type

7 main heat exchangers

8 circulating pumps

9 pressure pipelines

10 pipelines

11 pipelines

The reflux line of 12 indoor heatings

The reflux line of 13 undrinkable water heating

14 reversal valves

15 control driving means

16 effusion meters

17 bypass ducts

18 pressure limiting valves, bypass valve

19 equalizing reservoirs, expansion vessel

20 relief valve, pressure limiting valve

21 air bleeding valves

22 housing units

The bottom of 23 heater housings

24 middle casings on housing unit 22

25 middle casings

26 pump cases

27 motor

28 pressure sleeves

29 chambers

30 connection ends

31 horizontal pipeline sections

32 vertical pipeline sections

33 annular end faces

34 levers

35 seals

36 connection ends

37 wall portions

38 air separators

40 profiled members

41 recesses

50 axial directions.

Claims

1. there are two heating cycles, a heating cycle to be used for interior for a kind of housing unit for heater, the heater Heat supply, a heating cycle are heated for undrinkable water, and the housing unit has pump case (26), and the pump case is in suction Side has a chamber (29), and two reflux lines (12,13) it is passed through in the chamber, the reflux line is by opening for being disposed therein Close element alternately to be closed relative to the suction side of pump, it is characterised in that and the reflux line (12,13) chamber is passed through at which The angle α between 60 ° and 120 ° is surrounded in the region of wall.

2. housing unit according to claim 1, it is characterised in that the reflux line in the chamber (29) (12,13) by pipeline section (31,32) constitute.

3. housing unit according to claim 2, it is characterised in that and the pipeline section (31,32) at least in the chamber (29) it is configured to straight in region, and is arranged to be more likely to be perpendicular to each other.

4. according to housing unit in any one of the preceding claims wherein, it is characterised in that be passed through the pipe of the chamber (29) Section (31,32) it is configured to incline towards each other in side, so that the end face (33) in tube section ends is put toward each other.

5. housing unit according to claim 4, it is characterised in that the end face (33) in the tube section ends is put down each other OK.

6. housing unit according to any one of claim 1 to 3, it is characterised in that set in the pump case (26) Have for the reflux line (12, connection end 13), wherein, reflux line (12) for the heating cycle of indoor heating Connection end (2) is arranged on below the pump case (26) in installation site, the heating cycle heated for undrinkable water The connection end (30) of reflux line (13) is arranged on the side of the pump case (26) in installation site.

7. housing unit according to any one of claim 1 to 3, it is characterised in that described chamber (29) constitute air A part for separator (38), and air bleeding valve (21) is provided with top in installation site.

8. housing unit according to any one of claim 1 to 3, it is characterised in that the switch element has lever (34), the one end of the lever is furnished with seal (35), and the seal is arranged between tube section ends with a gap, the lever Be pivotally supported in the wall portion (37) for surrounding the chamber (29), the other end of the lever with control driving means (15) it is connected.

9. housing unit according to claim 8, it is characterised in that control driving means (15) are arranged on the pump The opposed side opposite with motor (27) of housing (26).

10. housing unit according to claim 8, it is characterised in that control driving means (15) are in installation site On be arranged on the dorsal part of the pump case (26).

11. housing units according to claim 8, it is characterised in that the axial direction (50) along impeller is observed, the pump Housing (26) have substantially rectangular cross-sectional configuration outline, lever (34) with regard to the rectangle outline diagonal arrange.

12. housing units according to claim 8, it is characterised in that in order that the lever (34) is combined in the pump In housing (26), connection sleeve pipe (36) is set, lever (34) can pacify together with the wall portion (37) of the lever is supported It is mounted in the connection sleeve pipe.

13. housing units according to any one of claim 1 to 3, it is characterised in that the housing unit is arranged on plate The side of the narrow side of formula heat exchanger (6), and by the reflux line (13) for undrinkable water to be heated and the plate Formula heat exchanger is connected.

14. housing units according to claim 13, it is characterised in that the housing unit is by being used for non-drink to be heated It is connected with the heat-exchangers of the plate type by middle casing (24) with the reflux line (13) of water.

15. housing units according to claim 8, it is characterised in that in the axial direction along impeller of the pump case (26) Top in the rectangle outline that direction (50) is observed on the one hand by pressure sleeve (28) within installation site projects, separately On the one hand air bleeding valve (21) is higher by, wherein, control driving means (15) of the switch element are arranged on the contour area Within.

16. housing units according to any one of claim 1 to 3, it is characterised in that in the interior of the pump case (26) Portion is provided with passage, and the passage is in the case of middle connection bypass valve (18) by the institute of the heating cycle for undrinkable water heating State reflux line (13) to be connected with the chamber (29), and/or in the case of middle connection pressure limiting valve (20) with surrounding It is connected.

17. housing units according to claim 16, it is characterised in that the passage is by the profiled member in the chamber wall Constitute, the profiled member in the chamber wall is abreast arranged with being used for receiving the profiled member of air bleeding valve (21), and be passed through and be connected to use In the pipeline section (31) of the reflux line (13) of undrinkable water to be heated.

18. housing units according to claim 17, it is characterised in that between the passage and the chamber (29) Pipeline connection is made up of the perforation (41) in the profiled member (40) in the chamber wall.

19. housing units according to claim 17, it is characterised in that in bypass valve (18) and the chamber wall Profiled member (40) is combined as a whole.

20. housing units according to claim 17, it is characterised in that pressure limiting valve (20) cartridge type ground and the chamber Profiled member (40) in locular wall is combined as a whole.

21. housing units according to any one of claim 1 to 3, it is characterised in that described pump case (26) are by one Synthetic material injection molding part is configured to changing.