EP2629019A1 - Housing unit for a heater - Google Patents

Abstract

The unit has two heating circuits provided for room heating and domestic water heating, respectively. A pump housing (26) has a suction-side chamber (29) into which two return lines (12, 13) open. The return lines are closed off towards a suction side of a pump by a switching unit. The return lines comprise an angle (alpha) between 60 and 120 degrees in an area of a passage through a chamber wall. Horizontal and vertical pipe sections (31, 32) are arranged perpendicular to each other, and connections for the return lines are formed at the housing, where the switching unit has a lever (34). The pump housing is designed as a plastic injection molding part.

Description

The invention relates to a housing unit for a heater with the features specified in the preamble of claim 1.

Such housing units for heaters, typically mounted wall-mounted gas-fired heating, are known in numerous construction variants. The core of the structure is always a pump, a changeover valve, which optionally line connected one or the other heating circuit with a primary heat exchanger and a plate heat exchanger, which is used for domestic water heating. Further provided are typically a bypass line, a breather, a pressure relief valve, sensors, such as pressure gauges, flow meters and the like, and other components. In order to avoid a complicated individual piping of the aforementioned components, it is prior art so-called housing units, which are typically made of plastic injection, vorzuhalten, which record not only the line connections between the components but also a large part of the components.

A generic housing unit is made EP 2 397 777 A1 known. This housing unit is provided for connection to a terminal pair of a plate heat exchanger in such a way that in the assembled state, the housing unit is arranged in front of the plate heat exchanger. Such an arrangement has the advantage that it has a comparatively small width, but builds relatively large in depth. A disadvantage of this design is also that the plate heat exchanger is accessible only after disassembly of the housing unit, which When replacing the plate heat exchanger leads to high labor costs in the repair.

Against this background, the invention has the object, a generic housing unit in such a way that on the one hand a compact design with a small number of individual casings is achieved, on the other hand, the plate heat exchanger is as easy as possible interchangeable.

This object is achieved according to the invention by a housing unit having the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims, the following description and the figures.

The housing unit according to the invention for a heater with two heating circuits, one for space heating and one for domestic water heating, has a pump housing, which has a chamber on the suction side, open into the two return lines, which can be shut off alternately by means of a switching member arranged opposite the suction side of the pump are. According to the invention, the return lines are arranged in the region of their passage through the chamber wall at an angle α between 60 ° and 120 ° to each other, ie the return lines are approximately perpendicular to each other, so that the one return line, in particular the heating circuit for space heating at the bottom can lead, whereas the other return line opens laterally. With such a housing unit, it is possible to realize a juxtaposition of plate heat exchanger and housing unit with pump, which makes it possible to replace the plate heat exchanger in the heater, without having to remove the housing unit previously. The embodiment of the invention has the further advantage that a very compact housing unit is achievable, which allows the construction of a heater with only a small depth.

The basic idea of the present invention is to design the housing unit in such a way that the return lines in the region of their passage through the chamber wall enclose an angle between 60 ° and 120 °, that is, they are advantageously approximately perpendicular to one another. Then the return line, which is typically brought from below to the heating bath, can connect the space heating to the housing unit in a quasi-direct way. By arranged at an angle α of 60 ° to 120 ° advantageously about 90 ° thereto return line of the heating circuit for domestic water heating, a lateral arrangement is possible, which allows an arrangement immediately adjacent to a plate heat exchanger, the connection to the plate heat exchanger either through the housing unit itself or advantageous can be done via an intermediate housing. The connection is expediently carried out in installation eye from the rear, in order to remove the plate heat exchanger without disassembly of the housing unit or any intermediate housing forward in case of repair.

The angle α is preferably oriented around the axis of rotation of the pump impeller. The suction-side chamber, in which the return lines open, also has a switching element, with which the return lines are alternately blocked, so that the space formed in the suction chamber can be used as a valve housing and on the other within this space a flow calming and air separation take place can, so that advantageously this chamber also forms part of an air separator, for example, when near the installation position in the upper side a vent valve is arranged with access to the environment.

On the one hand to realize the valve function within the chamber, on the other hand to provide a housing unit, which is technically cheap to manufacture, is provided according to an advantageous development of the invention to form the return lines within the chamber through pipe sections, preferably at least in the region of the chamber rectilinear and are arranged approximately perpendicular to each other, so that they can be formed at least on the inside by means of drawing cores.

In this case, the free ends of the pipe sections which open out into the chamber are advantageously designed to one another in such a way that the annular end faces lie opposite one another at the pipe section ends, preferably being arranged in parallel. A parallel arrangement has the advantage that the formation of the intermediate switching element can also be done in parallel. Alternatively, the switching element may also be formed with wedge-shaped sealing surfaces which are at an angle to one another. It is understood that the beveling of the pipe section ends then takes place in accordance with each other, so that with the switching element depending on the position either the one pipe end or the other end of pipe sections can be closed.

The connections for the return lines can advantageously be provided directly on the pump housing, in particular the chamber, wherein expediently the connection for the return line of the heating circuit for space heating in installation position below and the connection for the return line of the heating circuit for domestic water heating in installation position is arranged laterally on the pump housing , The installation position is always defined by the arrangement of the air separator, which is arranged with its vent valve in the upper region of the chamber, in particular in breather pumps.

In the housing unit according to the invention, the chamber forms part of an air separator. The arrangement of an air separator in the suction-side region of the pump, in particular as part of the chamber is particularly advantageous, but an air separator can also be provided elsewhere, optionally also outside the housing unit.

According to an advantageous embodiment of the invention, the switching element on a lever, one end of which is provided with a sealing body which is arranged with clearance between the pipe ends, wherein the lever is pivotally mounted in a wall portion delimiting the chamber and its other end with a control drive connected is. In the area of the wall section not only the storage but also the sealing of the lever, this can be done either by a seal or advantageously by a sealing sleeve. In this case, a sealing body may be provided at the end of the lever, which alternately seals the front ends of the pipe sections with two sides arranged at approximately 180 ° to one another. However, it can also be provided on both sides of the lever at the end of two separate sealing body, a sealing body for the end face of a pipe section and another sealing body for the end face of the other pipe section. The control drive is located outside of the liquid-carrying part of the pump housing and is accessible from the outside so that it is interchangeable without removing the lever.

Such switching devices are state of the art. It is only exemplary in this context EP 2 397 777 A1 referenced, where such a switching device with control drive is described in detail.

In particular, in the above-described housing arrangement, in which the plate heat exchanger is arranged adjacent to the housing unit, it is advantageous to arrange the control drive on the side of the pump housing, which is opposite to the drive motor turned away. In such an arrangement, the drive motor on the one hand and the control drive are always arranged at two sides typically facing away from each other by 180 °, the control drive and the motor thus enclose the intermediate housing unit. It is particularly advantageous to arrange the control drive in installation position on the back of the pump housing, since it is space saving accommodated here, on the other hand so far accessible that it is interchangeable without removing the housing unit in the back, if what is typically the case, to a Side, for example, enough space to the top to access behind the housing unit can.

If the pump housing seen in the axial direction of the impeller has a substantially rectangular outer contour, as is typically the case when the pump head having the motor is fixed to the pump housing with four screws, so that from the per se circular shape forms a square contour, then It is particularly advantageous to arrange diagonally the lever with respect to the rectangular outer contour, since over the diagonal of the lever may have a greater length than in another arrangement, without projecting beyond the outer contour of the housing.

Appropriately, a connection piece is provided on the rear side of the pump housing, which serves for the integration of the lever in the pump housing and in which the lever can be used together with the wall portion in which it is mounted. Such connecting pieces for exchangeable attachment of the switching element are state of the art and are in EP 2 397 777 A1 described and illustrated in detail.

Advantageously, the housing unit according to the invention is designed and arranged so that it next to the narrow side of the plate heat exchanger sits and with this via the return line for the service water to be heated and also mechanically connected, wherein advantageously an intermediate housing is provided, which mechanically and line connects the housing unit with the plate heat exchanger. This intermediate housing can also form part of the housing unit.

Advantageously, the housing unit is designed so that the pump housing is projected in its in the axial direction of the impeller seen rectangular outer contour of the mounting position in the upper side by a pressure port on the one hand and the vent valve on the other. Such an arrangement is expedient, since the vent valve should be located on the one hand as possible at the highest point of the pump, on the other hand, the discharge nozzle leads to a line which leads upwards in the heater to a primary heat exchanger in which the water of the primary heating by means of a burner becomes. In such an arrangement, the free space lying in the contour region between them can be used for the arrangement of the control drive for the switching element. Such an arrangement has the advantage that the control drive is arranged on the one hand on a usually accessible location, on the other hand in a room that is not otherwise usable anyway.

Advantageously, the housing unit within the pump housing on a channel which connects the return line of the heating circuit for domestic water heating with the interposition of a bypass valve with the chamber. Additionally or alternatively, this channel can connect the return line of the heating circuit for domestic water heating with the interposition of a pressure relief valve with the environment. Advantageously, both by means of this channel, ie on the one hand, the bypass connection between the return line and the chamber is formed, which ensures that when the heating circuit is closed for the space heating a circulation system is maintained and on the other hand, via the pressure relief valve creates a connection to the environment, which ensures that when a predetermined pressure is exceeded, a pressure relief via this valve in the outside environment can be done without the risk that components within the System burst due to an inadmissibly high pressure rise or fail in any other way. Such a channel is advantageously formed by molding into the chamber wall, wherein the indentation is advantageously arranged so that it is arranged parallel to a recess for receiving the vent valve, so that it can be formed in the same way with drawing cores inside. In this case, the indentation is guided into the pipe section, which adjoins the return line for the hot water to be heated, ie in the area upstream of the switching element in the flow direction.

In this case, the line connection between the channel and the chamber may be formed in a simple manner by an opening in the wall of the indentation. It is not important to optimize the flow, as the bypass line is not needed in normal operation. Then, the bypass valve is advantageously incorporated into the indentation, d. H. that the opening is closed by the bypass valve and released only after opening the bypass valve. Also, the pressure relief valve is advantageously incorporated into the indentation, suitably introduced into the manner of a cartridge in this, so that at the free end of the indentation only a handle for test operation and a preferably in installation position directed backward outlet protrude.

Advantageously, the housing unit according to the invention is integrally formed as a plastic injection molded part, so as to cost in large-scale production as a receptacle for the aforementioned and also optionally to serve other components of the heater and at the same time to form the necessary connection lines.

Fig. 1

in stark vereinfachter schematischer Darstellung ein hydraulisches Schaltbild einer Heizungsanlage mit einem Heizgerät,

Fig. 2

eine Ansicht in Einbaulage von oben auf die Gehäuseeinheit mit angeschlossenem Plattenwörmetauscher und Zwischengehäusen,

Fig. 3

eine Ansicht in Einbaulage von hinten der Bauteile gemäß Fig. 2,

Fig. 4

eine Seitenansicht der Gehäuseeinheit und

Fig. 5

in vergrößerter Schnittdarstellung die Gehäuseeinheit in Ansicht gemäß Fig. 3.

The invention is explained in more detail with reference to an embodiment shown in the drawing. Show it:

Fig. 1

in a highly simplified schematic representation of a hydraulic circuit diagram of a heating system with a heater,

Fig. 2

a view in installation position from above on the housing unit with attached Plattenwörmetauscher and intermediate housings,

Fig. 3

a view in installation position from the rear of the components according to Fig. 2 .

Fig. 4

a side view of the housing unit and

Fig. 5

in enlarged sectional view of the housing unit in view according to Fig. 3 ,

The basis of Fig. 1 shown heating system has two heating circuits, one for space heating and one for domestic water heating. The system consists of the actual heater, which can be designed as a wall-mounted gas heater or as a floor mounted heater. The device side part is in Fig. 1 formed by the part of the heating system shown above the broken line 0, the rest of the building-side part through the underlying.

The heater has four water supply connections exiting the bottom of the unit, namely a heating supply connection 1, a heating return connection 2, a cold water connection 3 and a hot water connection 4. The other connections (gas, electric) are not shown. This heater thus serves on the one hand to supply heat exchangers 5, for example in the form of radiators for space heating and for heating domestic hot water. For this purpose, a Plattenwörmetauscher 6 is provided within the heater, via which the coming of the cold water connection 3 cold service water is heated and directed to the hot water connection 4. The heating takes place by means of a warm water generated in the heater in a primary heat exchanger 7, for example by combustion of gas, which is conducted in the counterflow through the plate heat exchanger 6.

For circulating the heat transfer medium, typically water, provided by the primary heat exchanger 7 and the secondary heat exchanger 5 and 6 in its circulation pump 8 in the form of a wet-running centrifugal pump. This circulating pump 8 conveys the heat transfer medium via a pressure line 9 to the primary heat exchanger 7, where this is heated and fed either via a line 10 to the plate heat exchanger 6 or via a line 11 to the heating flow connection 1 and from there to the heat exchangers 5 of the space heater. The emerging from the heat exchangers 5 and 6 medium is fed via a return line 12, which leads the water coming from the heat exchanger 5, and via a return line 13, which leads the water coming from the heat exchanger 6, a changeover valve 14, which depending on the switching position either Return line 12 or the return line 13 to the suction side of the pump 8 connects.

The switching valve 14 is controlled by means of an electric motor 15 such that in operation, the return line 12 is connected to the pump 8. If warm water is to be removed at the hot water tap, this is detected by means of a flow sensor 16 and the valve 14 is actuated by switching by means of the electromotive control drive 15, so that the return line 13 is connected to the suction side of the pump 8.

In addition, the heater on a bypass line 17, which ensures that even when closing both heating circuits circulation within the heater is possible. For this purpose, a pressure relief valve 18 is incorporated as a bypass valve in the bypass line 17, which opens from a preset differential pressure. In addition, the heater has other components, of which only an example here, a surge tank 19, a safety valve 20 and a vent valve 21 are shown.

In order to facilitate the construction of the heater, in particular the internal structure and the piping within the device both during assembly and during subsequent maintenance, a housing unit 22 is provided which is formed as a one-piece plastic injection molded part.

The in the FIGS. 2 to 5 shown and described in detail below housing unit 22 is, in particular the Fig. 2 and 3 it can be seen, provided for arrangement in addition to the plate heat exchanger 6, which is arranged wall-mounted in installation position and is arranged with the housing unit 22 at the bottom 23 of the device housing, such that the terminals 1 - 4 can be occupied by the underside of the device housing.

The plate heat exchanger 6 is arranged in the illustrated embodiment so that it can be removed after loosening two screws without disassembly of the housing unit 22 or intermediate housings 24 and 25, which connect to the heat exchanger 6, forward, which makes the device very easy to maintain makes, especially in calcareous water premature failure of the plate heat exchanger 6 can not be excluded.

The housing unit 22 comprises, on the one hand, a pump housing 26, which is formed on the side facing the installation side for connecting an electric motor 27, on the shaft of which a rotary wheel is seated which is rotatably arranged in the pump housing 26, which is a volute, and there Promotes heat transfer medium from the suction port of a in installation position upwardly outgoing pressure port 28 into the conduit 9. Suction side, d. H. in installation position behind the space for the impeller, the pump housing has a chamber 29 which is cup-shaped and in installation position at the bottom has a connection for the return line 12 of the space heater, which is formed there as a heater return port 2. Furthermore, the chamber 29 laterally, in the installed position on the left side to the plate heat exchanger 6 towards a port 30 which connects to the intermediate housing 24 and receives the return line 13 from the plate heat exchanger 6. For the terminals 2 and 30 openings in the radial chamber wall 29 are provided, which are surrounded and continued in the interior of the chamber 29 by pipe sections 31 and 32, which lead these line connections in the interior of the chamber 29. The openings in the radial chamber wall for the terminals 2 and 30 are arranged in the present embodiment at an angle α of 90 ° to each other, wherein the lateral connection 30 is arranged offset in the radial chamber wall a piece down.

The pipe sections 31 and 32 are chamfered at their free ends, so that their annular end faces 33 facing each other and are arranged parallel to each other, as is apparent from Fig. 5 is apparent. The pipe sections 31 and 32 can be closed alternately by means of a switching element which consists of a lever 34, which is guided pivotably through the chamber wall and at the inner end of a sealing body 35 is arranged, which closes or releases depending on the lever position, the free end of the pipe section 31 or the free end of the pipe section 32. The lever end located outside the chamber 29 is connected to the control drive 15, which is arranged perpendicular to the lever 34. The longitudinal axis of the lever 34 includes in the installed position with the horizontal or the bottom of the pump housing 26 at an angle of 45 °, ie the lever 34 is relative to the in the axial direction (50) of the impeller axis seen substantially square pump housing 26 arranged diagonally and that For this purpose, a corresponding terminal 36 is formed on the back, in which the lever 34 with a wall portion 37, in which it is pivotally mounted, is incorporated like a cartridge. The control drive 15, which is arranged perpendicular to the pump housing 26 extends beyond the top and is located in the axial direction 50 of the impeller between the discharge nozzle 28 and an air separator 38 with vent valve 21 and the underlying safety valve 20. The safety valve 20 is like a cartridge an indentation 40 is incorporated in the chamber wall, which ends open into the pipe section 31, which forms the return line from the plate heat exchanger 6 and which is connected via a recess 41 in the wall of the indentation 40 with the interior of the chamber 29. In the indentation 40, a pressure limiting valve 18 is incorporated as a bypass valve on the tube side, this is followed by the safety valve 20, which connects the interior of the chamber 29 with the environment when exceeding a predetermined pressure on the recess 41.

The chamber 29 not only includes the switching valve 14 but also serves for air separation in the area in front of the suction mouth and is provided at the top with the air separator 38, which includes the Luftabscheideventil 21.

The intermediate case 24 connects to a pair of the line terminals of the plate heat exchanger 6 whose other pair is connected through the intermediate case 25. In particular Fig. 5 illustrates the intermediate housing 24 connects the terminal 30 of the housing unit 22 with the lower terminal of the right in the installed position rear terminal pair of the plate heat exchanger 6. The upper terminal 6 is led out to a line connection. The intermediate housing 25 connects to the other rear terminal pair of the plate heat exchanger 6 and leads to the heating flow connection 1 and the hot water connection 4 at the bottom 23 of the heater.

The space used above, such as front, rear, top, bottom and side always refer to an arrangement in which the heater, for example, wall-mounted, the bottom 23 of the heater is arranged horizontally and the internals extend from there upwards. The view is always with the front housing wall open, as is customary in heating baths, wherein the rear wall of the housing is arranged on the wall on which the device is mounted.

LIST OF REFERENCE NUMBERS

0

horizontal line in Fig. 1

1

Heating flow connection

2

Heating return connection

3

Cold water supply

4

Hot water

5

Heat exchanger space heating

6

Plattenwörmetauscher

7

Primary heat exchanger

8th

circulating pump

9

pressure line

10

management

11

management

12

Return line of the room heating

13

Return line for domestic water heating

14

switching valve

15

ControlsDrive

16

Flowmeter

17

bypass line

18

Pressure relief valve, bypass valve

19

Compensation vessel, expansion vessel

20

Safety valve, pressure relief valve

21

vent valve

22

housing unit

23

Bottom of the device housing

24

Intermediate housing at 22

25

intermediate housing

26

pump housing

27

electric motor

28

pressure port

29

chamber

30

connection

31

Horizontal pipe section

32

Vertical pipe section

33

Ring-shaped end faces

34

lever

35

sealing body

36

connection

37

wall section

38

air separator

40

indentation

41

recess

50

axially

Claims (19)

Housing unit for a heater with two heating circuits, one for space heating and one for the domestic water heating, with a pump housing (26), which on the suction side a chamber (29), in the two return lines (12, 13) open, by means of a arranged therein Switching member (34, 35) against the suction side of the pump are alternately shut off, characterized in that the return lines (12, 13) in the region of their passage through the chamber wall an angle a between 60 ° and 120 °. Housing unit according to claim 1, characterized in that the return lines (12, 13) within the chamber (29) by pipe sections (31, 32) are formed. Housing unit according to claim 2, characterized in that the pipe sections (31, 32) are rectilinear at least in the region of the chamber (29) and are arranged approximately perpendicular to each other. Housing unit according to one of the preceding claims, characterized in that in the chamber (29) emptying pipe sections (31, 32) are beveled towards each end so that the end faces (33) are arranged opposite each other at the tube ends, preferably in parallel. Housing unit according to one of the preceding claims, characterized in that the pump housing (26) connections for the return lines (12, 13) are provided, of which the connection (2) for the return line (12) of the heating circuit for space heating in installation position below and the connection (30) for the return line (13) of the heating circuit for domestic water heating in Installation position is arranged laterally on the pump housing (26). Housing unit according to one of the preceding claims, characterized in that the chamber (29) forms part of an air separator (38), and is provided in the installation position at the top with a vent valve (21). Housing unit according to one of the preceding claims, characterized in that the switching member (34, 35) has a lever (34) whose one end is provided with a sealing body (35) which is arranged with play between the tube ends, which pivotally in a the chamber (29) limiting wall portion (37) is mounted and the other end is connected to a control drive (15). Housing unit according to one of the preceding claims, characterized in that the control drive (15) on the side of the pump housing (26) is arranged, which is arranged facing away from the drive motor (27). Housing unit according to one of the preceding claims, characterized in that the control drive (15) is arranged in the installed position on the rear side of the pump housing (26). Housing unit according to one of the preceding claims, characterized in that the pump housing (26) seen in the axial direction (50) of the impeller has a substantially rectangular outer contour and that the lever (34) is arranged diagonally with respect to the rectangular outer contour. Housing unit according to one of the preceding claims, characterized in that for the incorporation of the lever (34) in the pump housing (26) has a connecting piece (36) is provided, in which the lever (34) together with the wall portion (37), in which he is stored, can be used. Housing unit according to one of the preceding claims, characterized in that it is arranged next to the narrow side of a plate heat exchanger (6) and connected thereto via the return line (13) for the hot water to be heated preferably by means of an intermediate housing (24). Housing unit according to one of the preceding claims, characterized in that the pump housing (26) in its in the axial direction (50) of the impeller seen rectangular outer contour on the upper side in installation position by a pressure port (28) on the one hand and the vent valve (21) on the other hand, wherein in the contour region between the control drive (15) for the switching member (34, 35) is arranged. Housing unit according to one of the preceding claims, characterized in that within the pump housing (26), a channel is provided which the return line (13) of the heating circuit for domestic water heating with the interposition of a bypass valve (18) with the chamber (29) and / or Intermediate connection of a pressure relief valve (20) connects to the environment. Housing unit according to one of the preceding claims, characterized in that the channel is formed by a indentation in the chamber wall, which is arranged parallel to a recess for receiving the vent valve (21) and which opens into the pipe section (31) which leads to the return line (13) for the hot water to be heated. Housing unit according to one of the preceding claims, characterized in that the line connection between the channel and the chamber (29) through an opening (41) in the indentation (40) is formed, Housing unit according to one of the preceding claims, characterized in that the bypass valve (18) is incorporated in the indentation (40). Housing unit according to one of the preceding claims, characterized in that the pressure-limiting valve (20) is incorporated in a cartridge-like manner in the indentation (40). Housing unit according to one of the preceding claims, characterized in that the pump housing (26) is integrally formed as a plastic injection molded part.

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