EP1528330B1 - Assembly for a compact heating installation - Google Patents

Abstract

The modular unit for a compact heating system has rear connections for a plate heat exchanger includes a pump housing (24) connected on both sides to a valve housing (25,26). An insertion chamber (36,48) accessible from the front is provided in each valve housing to accommodate at least one valve. The insertion chambers each form a connection base for a pipe connector (19,20) for the heating system, a passage leading to the heat exchanger, and at least one additional passage or connector (37,38,58).

Description

The invention relates to a structural unit for a compact heating system.

Such units are state of the art and are used if possible to take all the fittings of such a heating system in a tight space and provide the necessary channel connections and line connections. This is not only a compact design to be achieved, but beyond both the manufacturing and assembly costs and the subsequent maintenance costs are reduced.

Out DE 100 07 873 C1 a unit for a compact heating system is known, which has two heating circuits, one for heating the heating water for the central heating and another for heating the service water. The structural unit described therein is comparatively compact and essentially composed of three injection-molded parts, of which the first centrally arranged forms the pump housing, which is designed to be open at the front for receiving the motor assembly, and form the two other fitting housings adjoining on both sides.

Based on this prior art, the present invention has the object to further improve such a unit, in particular to increase the functionality and thus simplify installation and maintenance on.

This object is achieved according to the invention by the features specified in claim 1.

Accordingly, the invention provides a unit for a compact heating system, which has rear connections for a plate heat exchanger, a central pump housing or pump housing component, connect to the valve body on both sides, wherein the pump housing for receiving the impeller and for connecting the electric motor is designed to be open at the front. In each fitting housing a front accessible plug-in space is provided, which serves to accommodate at least one valve. Furthermore, these insertion spaces each form a connection base for a connecting piece of the heating system, a channel leading to the plate heat exchanger and at least one further channel or connection.

The basic idea of the present invention is to form a connection base for the lines to be connected or connected by the two laterally adjoining the pump housing fitting housing with their insertion spaces and at the same time to receive the necessary fittings, by means of the front accessible plug-in spaces, so that a change of fittings even when installed easily possible. The plate heat exchanger connects the side fitting housing, so that the pump housing can be incorporated form-fitting between this fitting housing. Such a structural unit can, as will be described in detail below, preferably be formed from three injection-molded parts which can be produced exclusively by means of drawing cores, that is to say without melting cores, which is advantageous in terms of production technology.

Armature according to the present invention are not only valves or other switching elements, this may also be components such as air or dirt separators or parts thereof or, for example, a closure cap for a control opening.

In this case, the insertion spaces are arranged relative to the paired connection pieces for the plate heat exchanger so that they overlap one connection in the insertion direction, so that no separate transverse channel is required for the connection between the insertion space and connection piece of the plate heat exchanger. For this purpose, the insertion spaces are each connected to the bottom side with a channel leading to the plate heat exchanger channel through an opening in the ground, wherein this channel extends in the direction of insertion and to the connecting piece of the heat exchanger. In this way, insertion space and channel can each be formed by coming from the front or from the rear of the drawing cores in the tool, wherein the pulling core for the channel is also used for the connection piece. In this case, both fitting housing have a downwardly directed channel to a connecting piece for the heating flow or the heating return, which adjoins the insertion space.

It is advantageous if the insertion spaces each have a circular cross-section and are arranged with their longitudinal axes substantially parallel to the axis of rotation of the centrifugal wheel. Then the fittings / inserts to be incorporated into the drawer spaces can also be used from the front when mounted. Due to the round cross-section, a simple seal, for example with O-rings, is possible. In addition, bayonet or screw can be realized, which make it necessary to rotate a valve in the insertion space.

One of the insertion spaces is advantageously provided for receiving a switching valve, in particular a 3/2-way valve, which is preferably inserted as a plug-in module from the front into the insertion space. In this case, the insertion unit expediently not only the valve body, but also the sealing seats, so that in the case of a defect or during maintenance, all the essential parts of the switching valve forward together with the plug-in unit can be pulled out and overhauled or replaced. It is understood that the insertion space in the region of the switching valve has corresponding channel connections for the three channels to be alternately connected in pairs.

The switching valve controls the heating water flow coming from the primary heat exchanger either in the heating network or in a secondary heat exchanger, typically a plate heat exchanger. The control takes place in dependence of the hot water flow, for which appropriate sensors and control electronics are provided. The valve is actuated by appropriate actuating means, preferably by electric motor.

In order to accommodate the actuating means which control the valve as close as possible, but sealed against the fluid chamber, according to a development of the invention in the valve body transverse to the insertion direction for the changeover valve, a further, preferably accessible from above insertion space provided for the integration of the control means, in particular the electric motor is provided. The valve-near arrangement of the motor at the top is particularly favorable in terms of mechanical power transmission and has the advantage that the motor can be pulled up out of the insertion space in order to maintain or replace it, for example. Since there is typically a certain amount of free space above the unit, this positioning is therefore particularly favorable and easily accessible, ie. H. Both valve and motor can be replaced without having to remove the assembly.

It is particularly advantageous in terms of construction to provide a channel directed vertically downwards on the valve-side fitting housing to a connecting piece for the heating flow, which connects to the insertion space provided for the changeover valve.

This channel, which is then controlled by the changeover valve, leads down to a connecting piece for the heating flow. To arrange this connection piece for connection to the stationary lines on the underside of the unit is particularly favorable, since the lines are routinely routinely installed in the floor or baseboard area, especially when retrofitting the heating system, as is common in old buildings and therefore come from below. The connection of these lines is therefore simplified, in particular because of the good accessibility of the line connections in this area of the compact heating system.

It is advantageous if at the leading to the heating channel a bypass channel connects, which preferably extends parallel to the insertion direction under the valve-side insertion space to the rear and there opens into a leading to the suction side of the pump transverse channel. Such a bypass channel is required in compact heating systems, even if all thermostatic valves are closed to the radiators and thus no flow through the heating system is possible to ensure circulation at least within the compact heating system.

So that the bypass channel does not short-circuit the pump hydraulically, it is regularly necessary to use a control valve. This is advantageously used from the back of the channel and set by the expert in the installation of the system. In terms of manufacturing, this arrangement is favorable because the valve can be incorporated into the drawing core opening required anyway for the channel. However, this arrangement also offers considerable advantages, in particular during operation of the system. It not only increases the compactness of the unit, but also ensures that in the installed state, the control valve is not accessible, so not accidentally manipulated by an operator can be, but only targeted by the professional installation or removal of the unit.

It is advantageous if at the valve-side installation space, ie where the switching valve is incorporated, laterally a channel with line connection for leading to the primary heat exchanger line connects, preferably transversely to the insertion direction and on the side facing away from the pump side of the Armaturengehöuses. This coming from the primary heat exchanger line is connected by the switching valve either with the input line to the secondary heat exchanger (plate heat exchanger) or the heating flow. Since the primary heat exchanger is typically located in the upper area of the compact heating system, ie above the unit and its lines lead laterally down to the unit, it is also particularly advantageous montagetechnisch to provide this connection seen from the front on the left side of the valve-side fitting housing, since then namely a connection of the conduit usually formed from a substantially rigid tube is easy to accomplish.

If, as provided in accordance with the invention, in each of the fitting housing a frontally accessible insertion space is provided, it is expedient to complete the insertion spaces by bayonet connections by means of a lid or the insertable fitting therein, so that an exchange of valves or the Access to the drawer spaces is quick and easy. In this case, identical bayonets are preferably used for both insertion spaces, so that identical seals and the same cover or fitting connections can be used.

Advantageously, the other insertion space is provided and designed to receive a dirt separator. Then, after opening the lid of the insertion space of the dirt and so that the dirt collected therein are removed or is at least accessible to remove any deposits therein. It also needs no separate installation space for a dirt separator can be provided. The insertion space is dimensioned correspondingly large in order to ensure a sufficient effective flow cross-section despite the Abscheiderbedingten flow cross-section reduction. The dirt separator is therefore advantageously incorporated as a sieve-like insert in the insertion space, which is removable from the front after removing a lid. In the lid of the insertion space further fittings or sensors can be incorporated.

Advantageously, according to a further development of the invention, a safety valve is incorporated in the cover, which releases a connection to the outside atmosphere when a predetermined pressure is exceeded, or a channel connection into a drain or a collecting vessel. The arrangement of the valve in the lid, this can be quickly replaced, checked and cleaned, it also takes up the least possible installation space within the unit.

In this case, the lid is advantageously integrally formed with a component of the integrated in the lid fitting, in particular the safety valve and as a plastic injection molded part. The lid can thus simultaneously form cover function and, for example, housing function for the safety valve.

Also, the dirt separator side slide housing forms according to the invention, a connection base as explained above. Advantageously, it has two lateral connections for a heat storage for storing heated heating water, which are channel-separated by a einliederbore partition. The arrangement is chosen so that the integration of the partition the lateral connections the Heat storage in series with the coming out of the plate heat exchanger power to the primary heat exchanger. If, on the other hand, the assembly is to be used without heat storage, then only the lateral connections are to be closed. By then not incorporated dividing wall, the plug-in housing is freely continuous in the axial direction. This design variant thus allows the same tool to produce a unit both for compact heating systems with as well as for those without heat storage.

Advantageously, the poor Schmutzabscheiderseitigen fitting housing vertically downwardly directed channel to the Anchlussstutzen for the heating return.

Since it is necessary to integrate sensors in the unit, it is expedient to arrange them in such a way that they are easily accessible even in the installed position and, if necessary, can be checked or exchanged. For this reason, according to a development of the invention, a connection for integrating a sensor is provided on the insertion space provided for the dirt separator, preferably on the upper side. This sensor connection advantageously also has a bayonet connection, so that the sensor can be exchanged quickly and without tools.

Furthermore, it is favorable if a lateral connection is provided on the channel arranged between plug-in housing and connecting piece for the heating return, which can be locked by means of a valve. The compact heating system can then be emptied in the installed state via this lateral connection or filled by connecting a corresponding pressure line.

According to the invention also has the Schmutzabscheiderseitige. Insertion space on a bottom-side opening, which a fluid-conducting connection to a running in the direction of insertion channel forms a connection piece for the plate heat exchanger. In the same way as in the valve-side insertion space thus a direct channel connection to the connecting piece for the plate heat exchanger is formed, which can be formed by a simple pulling core in the tool. For this purpose, it is expedient if, on the one hand, the axes of the insertion space and the channel are arranged parallel to one another and the cross-sections of the insertion space and the channel overlap (as viewed in the insertion direction).

Furthermore, according to a development of the invention, the dirt separator on the insertion space preferably in the bottom region of a leading to the suction side of the pump channel. As a result, on the one hand, the functionality of dirt separator side. Einschubraums as a connection base further increased, also can be formed on a comparatively short way the required connection channel to the suction nozzle of the pump, which is located immediately adjacent to the dirt separator side valve body. Since both the valve body and the pump housing or this receiving injection molding component are manufactured as separate injection molded parts, which are joined only during assembly, these transverse channels can also be advantageously realized by drawing cores in the injection mold, without costly melting cores are required.

Advantageously, the unit is designed so that not only for the heating flow and the heating return downwardly directed connection piece are provided on the underside of the unit, but also the two other connections for the hot water supply and coming from the compact heating system heated hot water are provided on the bottom. Thus, it is expediently provided all four connecting pieces for the heating circuit and the service water supply to the underside of the unit, so that it can be connected to the stationary stationary lines with little maintenance.

In this case, the connections are advantageously arranged so that they are all in a horizontal plane. Then, namely, the unit, when the downward outgoing terminals are designed as plug-in connections, are connected by lowering down to the stationary lines, which can serve for sealing simple O-rings, as in connection connections of such units in the rest of the prior art counts.

Usually, these known in building units connectors are each positively secured by an approximately U-shaped bracket, which is postponed after joining the lines by joining transversely to the terminal. In the arrangement of the plug-in connections in the same horizontal plane can take place with appropriate, in view from the front side by side arrangement of the connections, this positive locking advantageously by a central closure plate, d. H. in that, after lowering downwards, the assembly unit is completely connected by inserting the central closure plate without the need for further assembly work.

Fig. 1

ein vereinfachtes Schaltbild einer Kompaktheizungsanlage mit einer erfindungsgemäßen Baueinheit,

Fig. 2

die komplett bestückte Baueinheit in perspektivischer Ansicht von rechts oben und vorne,

Fig. 3

die Baueinheit nach Fig. 2 in perspektivischer Ansicht von rechts unten und hinten,

Fig. 4

die Baueinheit in Darstellung nach Fig. 2 ohne Pumpenkopf und mit nach vorne offenen, unbestückten Einbauräumen,

Fig. 5

die Baueinheit nach Fig. 2 in perspektivischer Ansicht mit abgenommenen Plattenwärmetauscher von oben links und hinten,

Fig. 6

einen Schnitt durch das ventilseitige Armaturengehäuse in einer in Einschubrichtung liegenden Ebene,

Fig. 7

eine Ansicht der Baueinheit von vorne mit abgenommenen Pumpenkopf und nach vorne offenen und unbestückten Einbauräumen,

Fig. 8

in perspektivischer Darstellung von rechts oben und hinten das schmutzabscheiderseitige Armaturengehäuse

Fig. 9

das schmutzabscheiderseitige Armaturengehäuse gemäß Fig. 8 in teilweiser Schnittdarstellung,

Fig. 10

den hinter dem Saugmund liegenden Teil des Pumpengehäuses in perspektivischer Teilschnittdarstellung und

Fig. 11

einen Schnitt durch das Pumpengehäuse quer zur Laufradachse und in Strömungsrichtung unmittelbar vor dem Saugmund in Ansicht von hinten.

An embodiment of the invention is illustrated below with reference to the drawing. Show it:

Fig. 1

a simplified circuit diagram of a compact heating system with a structural unit according to the invention,

Fig. 2

the fully assembled unit in perspective view from the top right and front,

Fig. 3

the assembly after Fig. 2 in perspective view from bottom right and back,

Fig. 4

the unit according to representation Fig. 2 without pump head and with open, unpopulated installation spaces,

Fig. 5

the assembly after Fig. 2 in a perspective view with removed plate heat exchanger from top left and rear,

Fig. 6

a section through the valve-side fitting housing in a plane lying in the direction of insertion,

Fig. 7

a view of the unit from the front with removed pump head and front open and unpopulated installation spaces,

Fig. 8

in perspective from right above and behind the Schmutzabscheiderseitige valve body

Fig. 9

the Schmutzabscheiderseitige valve body according to Fig. 8 in partial sectional view,

Fig. 10

the lying behind the suction part of the pump housing in a perspective partial sectional view and

Fig. 11

a section through the pump housing transverse to the impeller axis and in the flow direction immediately in front of the suction mouth in view from the rear.

The basis of Fig. 1 shown compact heating system is a gas boiler, as it is typically intended for wall mounting as a compact device for heat supply working with radiators space heating and for hot water / hot water production. A burner 1 acts on a primary heat exchanger 2, the heated water of a heat exchanger 3, typically in the form of one or more radiators for space heating, is supplied. The cooled water flows from the heat exchanger 3 back to the primary heat exchanger 2 and is circulated by means of a arranged on the cold side of the heat exchanger 2, 3 circulation pump 4.

For hot water heating, a plate heat exchanger 5 is provided, in which the coming from the water network cold hot water is heated. Since the heating of the service water has to take place only in Entnahmefall, appropriate sensors, in particular a flow meter 6 as well as a pressure and temperature sensor 7 is provided, depending on the output signal of a servomotor 8 is driven, which drives a 3/2-way valve 9, in order to control the heating of domestic hot water coming from the primary heat exchanger 2 heat-conducting liquid flow instead of the heat exchanger 3 to the plate heat exchanger 5.

The graph after Fig. 1 makes no claim to completeness. Within the compact heating system, a surge tank 10 is provided and a heat storage 11, which is connected in series between plate heat exchanger 5 and the primary heat exchanger 2, here on the cold side.

The in Fig. 1 with 3 symbolized heat exchanger (radiator) is, as usual today in hot water heating systems, provided with a thermostatic valve 12, which controls the circuit in terms of flow resistance and then, if no heat demand is given locks. For the latter case, a bypass line 13 is provided within the compact heating system with a valve 14, via which the hydraulically effective line cross section of the bypass line 13 is adjustable. Through this bypass line 13, a closed circulation circuit is ensured, even if the thermostatic valve 12 is fully closed.

Furthermore, a safety valve 15 in the form of a pressure relief valve suction side of the pump 4 are provided and two shut-off valves 16 and 17, which are connected via a line 18 to each other.

In addition to the electrical and gas line connections for the compact heating system, which are not shown in the figures, the heating system has a total of four line connections in the form of plug connections, namely a connection 19 for the heating flow as a port 20 for the heating return. Furthermore, a connection 21 is provided for the service water inlet and a connection 22 for the coming from the plant hot water.

The in Fig. 1 framed by broken lines part of the compact heating system is formed by a structural unit 23, the structure of the basis of FIGS. 2 to 9 is shown in detail.

The assembly 23 is essentially composed of three injection-molded parts, namely a central, the pump housing-containing pump housing component 24, to the left in installation position seen from the front left a dashboard housing 25 and the right side a fitting housing 26. The components 24, 25 and 26 are manufactured as plastic injection molded components and designed to be without use of fused cores, ie with comparatively inexpensive tools that work with drawing cores can be produced. These components 24 to 26 are incorporated into each other in the transverse direction 27 to the impeller axis 28 of the pump and are positively secured by the rear-connected plate heat exchanger 5 in this position.

The pump housing component 24 has the actual pump housing and a forwardly open insertion space 29, which is provided for receiving the pump impeller and for flanging the forward adjoining motor 30. The pump housing has an obliquely right above outgoing discharge nozzle 31, the free end is formed as a threaded connection and is provided for connection of the primary heat exchanger 2 leading line. On the suction side connected to the pump housing or integrated into the pump housing component 24 is an air separator 32, in which a conventional Luftabscheideventil is incorporated.

The rearwardly directed suction mouth 33 of the pump is conductively connected to the valve housing 26 via a suction channel 34 extending in the transverse direction 27 into which it opens. The suction channel 34 continues in the fitting housing 26 continues to the right and opens into a rearwardly extending from the rear channel 35, which merges into a substantially cylindrically shaped, with its cylinder axis parallel to the impeller axis 28 and forward open insertion space 36, which serves as a central Anschussbasis for other connections or lines as well as for receiving fittings.

In the insertion space 36 of the right fitting housing 21 open the channels of two led out to the right line connections 37 and 38, which serve to connect the heat accumulator 11. In order to achieve the series connection described above, is in the insertion space 36 pressed from the front of a partition 39. This partition wall 39 is formed by a simple sheet metal or a plastic part, since it does not depend on a complete seal to the insertion space 36 out. For embodiments in which no heat storage 11 is used, the partition wall 39 is not used, the terminals 37 and 38 are closed by blind caps, so they are out of order.

In the insertion space 36 opens from below a line 40, at the end of the connection 20 is arranged for the heating return.

The bottom of the insertion space 36 is broken not only to the channel 35, but also in the upper left area (see Fig. 7 ), where a rear channel opens, which runs in alignment with a lower connecting piece 41, which is provided for connection of the plate heat exchanger 5. The connecting piece 41 is formed as a pair of connecting pieces together with the overlying connecting piece 42. The connecting piece 41 connects the Heizwasserkreislauf the heat exchanger 5 with the suction side of the pump 4. The upper connection piece 42, however, connects the hot water leading service water connection of the heat exchanger 5 with a vertically downwardly leading channel 43, which opens into the connection 22 for hot service water.

Near the rear end of the insertion space 36, a connection 66 is provided for the expansion tank 10 upwards.

Furthermore, in the insertion space 36 opens an obliquely coming from above and front receiving opening 44 which is provided at the end with a part of a bayonet fitting and in which a combined pressure and temperature sensor 45 is incorporated as a plug-in part, which is equipped with the other part of the bayonet closure ,

The insertion space 36 itself serves to receive a Schmutzabscheiders 46, which is inserted in the manner of a sieve in this and arranged so that the coming of the terminal 20, ie from the heating return water must penetrate this before it reaches the suction channel 34 of the pump. The dirt separator 46 is held in a form-fitting manner and can be pulled out to the front for cleaning purposes.

The insertion space 36 is provided towards the front with a bayonet closure, so that a corresponding lid can be placed without tools for the conclusion of the insertion space 36 and optionally removed again. It is understood that appropriate O-rings are provided as seals at the required locations.

In the illustrated embodiment, a safety valve 15 is incorporated in the lid 47 in the form of a pressure relief valve. In this case, the lid 47 forms part of the safety valve 15.

Both on the downwardly extending channel 40 for connecting the heating return and on the connecting piece 42 each transverse channels are connected, which are closed by means of the shut-off valves 16 and 17. These channels are connected to each other via a line 18 which is formed as a separate component. The shut-off valve 16 can serve both to fill the system via the line 18 and the open valve 17 as well as for emptying the system after removal of the line 18 due to the horizontal nozzle. The conduit 18 is mounted so that it can be detached manually without tools, so that it can be removed or inserted as needed.

The valve housing 25, which adjoins the pump housing component 24 from the front, likewise has a substantially cylindrical or graduated cylindrically designed insertion space 48, whose longitudinal axis is parallel to the impeller axis 28 is arranged. This insertion space 48 serves to receive the 3/2-way valve 9, which is designed in the form of a slide-in fitting, which can be inserted from the front into the insertion space 48 and sealingly locked by means of a bayonet connection. The insertion space 48 final bayonet connection is identical to that for the insertion space 29 so that same end cover can be used.

The insertion fitting 49 has, as best in Fig. 6 can be seen, two sealing seats, which are each closed by a sealing body. The sealing bodies are seated on a rod 50 arranged parallel to the rotor axis 28 and are aligned and arranged such that they always close in the direction of flow, whereby when moving the rod 50 in one direction the sealing body moves toward its sealing seat and the other is lifted off the latter or in the opposite direction in the reverse manner.

The rod 50 is actuated by a lever 51, which is arranged pivotably in a mounting fitting 52, which is incorporated in an upwardly open insertion space 53, which has an opening to the insertion space 48. In this way, the lever 51 can engage with one end on the rod carrying the sealing body 50 and with its other end to a spindle 54 which is extended by a motor 8 depending on the rotational position more or less. The installation fitting 52 comprises the lever 51, the spindle 54 and the motor 8 and is inserted from above into the insertion space 53 with incorporation of an elastic and sealing cuff 56. This cuff seals the passage of the lever 51 without hindering its mobility. In addition, the installation fitting 52 may additionally be sealed by O-rings relative to the insertion space 53.

To one side of the valve 9, namely in the front region of the insertion space 48 closes down an opening into the port 19 channel 57 for the heating flow. Laterally transversely to the insertion space 48 includes on the left side, in the area between the sealing seats of the insertion fitting 49, a channel which opens into the mating connecting piece 58, which is provided for connecting the line coming from the primary heat exchanger 2. These lateral connections 58 on the left side or the connection formed by the pressure port 31 on the right side are arranged particularly advantageously, since the in installation insert from above lines to or from the primary heat exchanger 2 are easy to connect, since they spring in the transverse direction 27 over its entire length and therefore well manipulable, d. H. away from the connection or to the connection are movable.

Also, the insertion space 48 has on the bottom side an opening to a substantially coaxially extending back channel, which opens into a connecting piece 59 for the plate heat exchanger 5. This lower connecting piece 59 belongs to a pair whose upper connecting piece 60 is connected via a transverse channel 61 with a vertically downwardly extending channel 62, which opens into the port 21 for the service water inlet. By this channel arrangement, depending on the switching position of the valve 9, the line connection 58 is conductively connected either to the lower connection piece 59 for the plate heat exchanger 5 or to the connection 19 for the heating flow. Again, the insertion space 48 forms a connection base for almost all on this side of the pump leading channels.

At the channel 19 extending vertically downward to the connection 19 includes a parallel to the impeller axis 28 to the rear extending channel 63, which together with the extending transversely thereto, in the channel region 63 and extending in the direction 27 extending Channel 64, the bypass line 13 forms. The transverse channel 64 opens in the lower rear region of the pump housing, ie in the suction chamber thereof, as in FIG Fig. 5 is clearly visible.

In the channel 63, a spring-loaded valve 14 is inserted from behind, through which the effective cross section of the bypass line 13 is pressure-dependent. On the vertical, leading to the port 21 channel 62 is a receptacle for a further pressure-temperature sensor 45 is provided to the front. Recording and sensor are formed in the same manner as that of the right fitting housing 26. This pressure / temperature sensor 45, which is inserted from the front, projects into the vertical and rear-side channel 62, which leads to the connection 21 for the service water inlet. In this case, the pressure sensor in conjunction with an obstruction formed in the channel 62 forms part of the flow meter 6 described in the introduction, in conjunction with a corresponding evaluation electronics, which is arranged in the terminal box 65.

For electrical connection of the assembly, the terminal box 65 is provided, which is arranged on the housing of the motor 30 and thus associated with the pump housing component 24.

The mechanical connection of the components 24, 25 and 26 takes place on the one hand via the channel connections (see Fig. 3 ) (34, 64) and on the other via corresponding, not described in detail here connecting webs, which are secured by means of threaded bolts. When the channel connections are plug-in connections under inclusion of an O-ring, which performs the sealing function of the compound as well as a transversely inserted to the insertion direction U-shaped bracket, which takes over the mechanical lock.

The above-described connections or connecting pieces are partly plug-in connections, threaded connections or flange-like Neck formed. The respective designs are only to be understood as examples and can be adapted, exchanged or modified according to the requirements.

How the particular Fig. 2 illustrates, the unit described above is extremely compact and is from the lateral dimensions approximately in alignment with the plate heat exchanger arranged rearwardly so that the entire unit between vertical struts of the chassis of the compact heating system is einliederbar, whereby the overall depth of the entire system can be reduced , Furthermore, all major units and fittings are accessible from the front or from the above the unit formed space so that they can be replaced and serviced without disassembly of the unit. But even the replacement of the unit is due to the lying in a horizontal plane terminals 19 to 22, which form the connection to the stationary water-bearing lines, especially when using a central closure plate little laborious, it is only the lateral connecting leads to be solved beforehand, after which entire unit can be lifted after opening the lock plate upwards and then pulled out to the front. Installation is the reverse order.

The design of the pump housing component 24, in particular in the rear part results in detail from the Figures 10 and 11 as well as in the installed state from the Figures 3 and 5 , As these representations illustrate, the actual pump housing is stepped back and extends below the plate heat exchanger 5, where from the right (seen from the front) of the suction channel 34 and from the left of the transverse channel 64 connects to the bypass line 13. This the heat exchanger 5 on its underside superior part 75 of the pump housing is upstream of the actual suction chamber and forms part of a Luftabscheideeinrichtung, the actual separator 32 adjoins the top and consists of a Luftabscheidekammer 70 and this up to the final vent valve 71.

The suction chamber of the pump, which is separated from the pressure chamber by a plate 72, opens into the suction mouth 33, which in its upper region is surrounded by an upper guide body 73 extending from the plate 72 backwards to the housing wall, approximately over 190 °. Downwardly at a distance, the suction mouth is surrounded by a lower guide body 74 which engages over the lower ends of the upper guide body 73 laterally and at a distance and also protrudes up to the rear housing wall of the pump housing component 24, specifically Fig. 10 The arrangement of the guide body 73 and 74 is such that the flow entering from the suction channel 34 to the in. Under the plate heat exchanger 5 lying below the plate heat exchanger 5 Fig. 11 shown and marked with arrows must take, namely the lower guide body 74 flow laterally under a change in direction of about 180 ° to then enter under further direction change of more than 90 ° in the suction port 33. In the area of this stepped housing section 75, a flow slowdown, which favors an air separation process, takes place on the one hand by a cross-sectional enlargement, on the other hand a deflection of about 180 ° with free space upwards, which in turn favors the upward escape of the flow. By these measures it is achieved that a virtually bubble-free flow enters the suction and the entrained air rises in the suction chamber upwards, where it is collected in the Luftabscheidekammer 70 and excreted via the vent valve 71 in a conventional manner in the environment.

As in Fig. 10 can be seen, the bypass channel 64 also opens in the bottom of the suction chamber, under the lower guide body 74th

LIST OF REFERENCE NUMBERS

1 -

burner

2 -

Primary heat exchanger

3 -

Heat exchanger, radiator

4 -

pump

5 -

Plate heat exchanger

6 -

Flowmeter

7 -

Pressure and temperature sensor

8th -

servomotor

9 -

3/2-way valve

10 -

surge tank

11 -

heat storage

12 -

thermostatic valve

13 -

bypass line

14 -

Valve

15 -

safety valve

16 -

shut-off valve

17 -

shut-off valve

18 -

management

19 -

Connection for heating flow

20 -

Connection for heating return

21-

Connection for domestic water supply

22 -

Connection for hot service water

23 -

unit

24 -

Pump housing component

25 -

Valve body left

26 -

Valve body right

27 -

transversely

28 -

wheel axle

29 -

Insertion space of the pump housing

30 -

engine

31 -

pressure port

32 -

air separator

33 -

saugmund

34 -

suction

35 -

channel

36 -

insertion space

37 -

Connection for heat storage

38 -

Connection for heat storage

39 -

partition wall

40 -

Line (heating return)

41 -

spigot

42 -

spigot

43 -

channel

44 -

admission

45 -

Pressure / temperature sensor

46 -

dirt separator

47 -

cover

48 -

insertion space

49 -

slide valve

50 -

Rod

51 -

lever

52 -

installation fitting

53 -

insertion space

54 -

spindle

56 -

cuff

57 -

channel

58 -

spigot

59 -

Connecting piece for heat exchanger (below)

60 -

Connecting piece for heat exchanger (top)

61 -

Querkanal

62 -

channel

63 -

Channel for bypass line

64 -

Cross channel for bypass line

65 -

terminal box

66 -

Connection for expansion tank

70 -

air separation chamber

71 -

vent valve

72 -

plate

73 -

upper guide body

74 -

lower guide body

75 -

stepped housing section

Claims (21)

1. A construction unit for a compact heating installation with rearward connections for a plate heat exchanger (6), with a central pump housing (24), to which fittings housings (25, 26) connect on both sides and which is designed open to the front for receiving the impeller and for connecting the electric motor (30), wherein an insert space (36, 48) accessible from the front for receiving at least one fitting is provided in each fittings housing (25, 26), and the insert spaces (36, 48) in each case form a connection base for a connection stub (19, 20) for the heating return or the heating feed of the heating installation, a channel leading to the plate heat exchanger (5) as well as at least one further channel (35) or connection (37, 38, 44, 58, 66), and wherein the insert spaces (36, 48) in each case are connected via a channel leading downwards in the installation position, to the connection stub for the heating installation, and in each case via a base-side opening, to a channel running in the insert direction and leading to a connection stub for the plate heat exchanger.
2. A construction unit according to claim 1, characterised in that the insert spaces (36, 48) in each case have a circular cross section, wherein the longitudinal axes of the insert spaces are arranged parallel to the rotation axis (28) of the impeller.
3. A construction unit according to claim 1 or 2, characterised in that an insert space (48) is provided and designed for incorporating a switch-over valve (9), in particular a 3/2-way valve.
4. A construction unit according to one of the preceding claims, characterised in that a switch-over valve (9) as an insert unit (49) is incorporated into an insert space (48), wherein the insert unit (49) includes the sealing seats and the sealing body or bodies.
5. A construction unit according to claim 3 or 4, characterised in that a further insert space (53), preferably accessible from above, for incorporating the actuation means (8) controlling the valve (9), and which connects to the insert space (48) for the switch-over valve (9) is provided in the fittings housing (25) transversely to the insert direction for the switch-over valve (9).
6. A construction unit according to one of the claims 3 to 5, characterised in that on the valve-side fittings housing (25), the perpendicularly downwardly directed channel (57) to the connection stub (19) for the heating feed connects to the insert space (48) provided for the switch-over valve (9).
7. A construction unit according to one of the preceding claims, characterised in that a bypass channel (63) which preferably extends parallel to the insert direction below the insert space (48) and to the rear, connects to the channel to the heating feed.
8. A construction unit according to claim 7, characterised in that the bypass channel (63) is formed open to the rear, for receiving a control valve (14) for setting the effective channel cross section.
9. A construction unit according to one of the claims 3 to 8, characterised in that a channel with a conduit connection (58) for a conduit leading to a primary heat exchanger (2) connects to the insert space (48) for the switch-over valve (9), preferably to the insert direction and on the side of the fittings housing (25) which is distant to the pump.
10. A construction unit according to one of the preceding claims, characterised in that the insert spaces (36, 48) which are accessible from the front may be closed off by way of an insert fitting or cover, connectable by way of bayonet, wherein the insert spaces (36, 48) preferably comprise identical bayonet connections.
11. A construction unit according to one of the preceding claims, characterised in that the insert space (36) is provided and designed for receiving a dirt separator (46).
12. A construction unit according to claim 11, characterised in that the insert space (36) for the dirt separator (46) may be closed off by way of a cover (47), in which a safety valve (15) is incorporated.
13. A construction unit according to claim 12, characterised in that the cover (47) is designed as one piece with a component of the fitting (15) integrated into the cover, in particular of the safety valve (15), and as an injection moulded part.
14. A construction unit according to one of the claims 11 to 13, characterised in that the insert housing (36) receiving the dirt separator (46) comprises two lateral connections (37, 38) for a heat storer (11) for storing heated hot water, which are channel-separated by way of an integratable separating wall (39).
15. A construction unit according to one of the claims 11 to 14, characterised in that the channel (40) from the fittings housing (26) on the dirt separator side which is directed perpendicularly downwards leads to the connection stub (20) for the heating return.
16. A construction unit according to one of the claims 11 to 15, characterised in that a connection (44) for incorporating a sensor (45) is provided on the insert space (36) provided for the dirt separator (46), preferably on the upper side.
17. A construction unit according to one of the preceding claims, characterised in that a lateral connection which may be closed off by way of a valve (16), is provided on the channel (40) arranged between the insert housing (36) and the connection stub (20) for the heating return.
18. A construction unit according to one of the claims 11 to 17, characterised in that a channel (35) leading to the suction side of the pump connects to the insert space (36) for the dirt separator (46), preferably in the base region.
19. A construction unit according to one of the preceding claims, characterised in that the construction unit (23) comprises four downwardly departing connections (19-22), for connection of the compact heating installation to the local heating- as well as domestic water connections.
20. A construction unit according to claim 19, characterised in that the connections (19-22) departing downwards lie in a horizontal plane.
21. A construction unit according to claim 19 or 20, characterised in that the downwardly departing connections (19-22) are designed as plug connections, may be conductingly connected to the stationary conduits by way of lowering the construction unit (23), and may be locked preferably by way of a central closure plate.

Images