EP0918197B1 - Assembly for a compact heating installation - Google Patents

Description

The invention relates to a structural unit for a compact heating system, in particular for a gas boiler with two heating circuits according to the preamble of Claim 1 specified characteristics.

Building units of this kind are increasingly being used today in compact heating systems, especially installed in gas water heaters or heating units. They include beside the centrifugal pump unit usually other components, such as Air separator, safety valve, changeover valve or the like. They are called Assembly, d. H. designed as a mounting and mounting unit, so that a simple and space-saving arrangement is ensured within the heating system. In addition, such a unit assembly and maintenance, since Accessibility to the otherwise tight installation space only at a few central points must be guaranteed and the rest in case of repair, the unit completely replaced and factory or elsewhere overhauled by the specialist and a reuse can be supplied.

Such a structural unit is known, for example, from EP 0 460 399 A2. These described unit is provided for a gas boiler, the two heating circuits includes, one for water heating and one for space heating, both through a common gas-heated primary heat exchanger be supplied with heat. Since the assembly for assembly in the flow of the Primary heat exchanger is provided, it has a suction nozzle and two Discharge nozzles connected to the two heating circuits. Further points this known assembly on an air separator on a return flow chamber is connected, through which the return lines of the heating circuits through the assembly are guided. In addition, a switchover between the Pump output and the two discharge ports provided, depending on the Direction of rotation of the impeller is controlled automatically, depending on the control to apply one or the other heating circuit.

Such a unit known from EP 0 460 399 A2 has basically proven. However, it is a constant effort to continue such a unit improve, in particular their manufacture to simplify their compactness increase as well as multiply their range of application. So it is in particular one Strive to combine in the unit further functions, especially at the Unit as centrally as possible to determine all piping. Another one Problem is that the arrangement of the connections within the heating system are not standardized, so that for each type, d. H. a separate one for each manufacturer Building unit is to manufacture what the manufacturing and storage costs significantly elevated.

Another such assembly is from the document EP-A-0 394 140 is known.

Against this background, the present invention is based on the object a generic unit designed constructively so that the aforementioned Requirements met, but at least a significant improvement over achieved in the prior art.

This object is achieved by the specified in claim 1 Characteristics solved. Advantageous embodiments of the invention are described in the subclaims, the following description and the drawing.

According to the invention is thus provided, the terminal housing with a central Chamber to provide, in the mouth of the pump opens, in which the Switching element is arranged and in the two acted upon by the switching element Suction open, with an air separator in the upper part of the chamber is provided or connected. This arrangement requires a comparatively large central chamber, which connects directly to the pump housing and In addition to connection functions, the switching function and the ventilation function includes. Since the chamber, the two suction nozzle and this acted upon Includes switching device, no separate piping between Switching device and pump required, as is the case in the prior art. The connection housing can be flanged directly to the pump housing be, with the central chamber communicating with the suction mouth of the Pump is connected, which opens into it. Due to the required suction nozzle as well as further described in detail below auxiliary stub of the Switching device and the air separator must the central chamber comparatively be educated. However, this leads to the conveyed medium in the Chamber undergoes a particularly good degassing, as the residence time in the chamber and thus the separation effect is comparatively high.

Basically, one strives to the size of the unit as small as possible which is why they have so far abstained, a comparatively large one Chamber, as required by the present invention provide. Despite this comparatively large chamber, the assembly according to the invention is particularly compact. This is because the chamber is a substantially cylindrical Having shape and in alignment with the pump housing substantially coaxially is arranged so that the terminal housing, at least as far as the Area of the chamber, essentially within the outer contour of the Pump housing is located and thus uses space, not in practice anyway would be usable elsewhere.

It is possible to have the pump housing with only one substantially tangential outgoing discharge nozzle and in the other one to the connection housing directed suction mouth is provided, integrally form as an injection molded part. It Manufacturing technology is also possible, pump housing and connection housing in one piece as an injection molded part. However, it is particularly advantageous that Pump housing two-piece and the terminal housing substantially in one piece form, since then a production of these components by injection molding without lost cores and with simple tools is possible, whereby the manufacturing costs, considerably reduced especially in mass articles of this kind can be. In spite of the structurally simple construction high efficiency To reach, it is expedient, a comparatively large impeller into the pump housing. This can be done before attaching the terminal box be mounted from the connection housing side when the pump housing at least two parts is formed, in particular next to the actual Pump housing has an annular plate, the form-fitting between Pump housing and terminal housing is einliederbar, in which case the inner recess this annular plate forms the suction mouth of the pump.

In order to be able to manufacture the connection housing cost-effectively without lost cores, is provided in a development of the invention, which is located in the chamber Use parts of the suction nozzle as separate components there and then cohesively with the terminal housing component, preferably by welding connect to. This separate production of the internal parts of the connection piece also has the advantage that the lying in the chamber sealing surfaces this nozzle, which are acted upon by the switching element, before the firm connection separately processed with the terminal housing, coated or at least can be targeted.

The switching element preferably consists of a sealing element located on a lever, which passes tightly through the chamber wall and outside the Chamber by an actuator, such as an electric motor, can be acted upon. In such an arrangement can the sealing body of the switching element either the opening into the chamber Close the end of one or the other suction port. That's why it is structurally particularly favorable, the suction nozzle opposite and transverse to To arrange impeller of the pump within the connection housing.

According to an advantageous development of the invention, however, it is provided the connection housing on its side facing away from the pump housing with a another component, namely to provide an adapter housing. This adapter housing can serve, for example, by the motor housing, pump housing and terminal housing formed assembly of heating systems different Type, d. H. to adapt to different manufacturers, so that only the adapter housing manufacturer-specific form, but not the entire Unit. In this case, it is particularly useful if the suction and if necessary, further auxiliary nozzles are led out on the end face directed towards the adapter housing so that there is no additional piping in this area can. In the case of such a constructive training are within the Terminal housing located parts of the intake manifold pipe-like design and frontally next to each other on the connector housing on the adapter housing directed side within the chamber. It can then be the the same previously described Schaltorgankonstruktion find unchanged use.

It is particularly advantageous if the adapter housing not only for adaptation the manufacturer-specific connections of the heating system is used, but about it in addition to the attachment of the entire unit within the heating system can be used. For this purpose, corresponding to the adapter housing Provide fasteners. Furthermore, on the adapter housing also additional components or connections, such as dirt separators, Manometer, bypass connections or the like may be provided. It goes without saying that these connections can possibly also be provided on the connection housing, if that should be appropriate. In addition, the terminal housing also mounting base for other components located within the heating system form, in particular for the plate heat exchanger usually located there, which the heat transfer between heating circuit and hot water circuit guaranteed. The arrangement of this heat exchanger near the unit is particularly useful because this heat exchanger has at least four pipe connections which are to be cased and thus at least partially by the Adapter housing can be formed.

Fig. 1

eine erfindungsgemäße Baueinheit in Explosionsdarstellung,

Fig. 2

die Baueinheit nach Fig. 1 in zusammengebautem und in die Heizungsanlage eingebautem Zustand,

Fig. 3

ein vereinfachtes Schaltbild einer Heizungsanlage,

Fig. 4

eine perspektivische Darstellung der Baueinheit gemäß Fig. 2,

Fig. 5

eine perspektivische Darstellung der Baueinheit gemäß Fig. 2 von einer anderen Seite,

Fig. 6

in vergrößerter Darstellung eine perspektivische Ansicht der Baueinheit nach Fig. 2 ohne Adaptergehäuse,

Fig. 7a

eine perspektivische Darstellung des Anschlußgehäuses der Baueinheit nach Fig. 2 vor Anbringung der Rohrkrümmer,

Fig. 7b

in Darstellung nach Fig. 7a das Anschlußgehäuse mit fertigmontierten Rohrkrümmern und

Fig. 8

eine weitere Ausführung einer Baueinheit gemäß der Erfindung in perspektivischer Darstellung.

The invention is explained in more detail with reference to embodiments shown in the drawing. In a schematic, simplified representation:

Fig. 1

an assembly according to the invention in an exploded view,

Fig. 2

1 in an assembled state and installed in the heating system,

Fig. 3

a simplified circuit diagram of a heating system,

Fig. 4

a perspective view of the assembly of FIG. 2,

Fig. 5

2 shows a perspective view of the assembly according to FIG. 2 from another side,

Fig. 6

in an enlarged view, a perspective view of the assembly of Figure 2 without adapter housing,

Fig. 7a

a perspective view of the terminal housing of the assembly of FIG. 2 prior to attachment of the pipe bend,

Fig. 7b

in representation of Fig. 7a, the terminal housing with fertigmontierten elbows and

Fig. 8

a further embodiment of a structural unit according to the invention in a perspective view.

The unit shown with reference to FIGS 1 to 7 is substantially by a motor housing 1, a pump housing 2, a terminal housing 3 and a Adapter housing 4 with the therein or on it individual components educated.

Within the motor housing 1 is in known manner an electric motor arranged on the motor housing 1, the usual terminal box is still flanged. The electric motor drives a centrifugal wheel inside the pump housing 2 is running. The pump housing 2 is releasably secured to the motor housing 1, it has a substantially cylindrical pump chamber, to which approximately tangential a line connects, which projecting into a laterally on the pump housing 2 Discharge nozzle 5 opens.

To the impeller of the motor side facing away from the pump housing. 2 to be able to mount and around the pump housing without lost core as To produce plastic injection molding, this is the connection housing. 3 formed open and covered by an annular plate 6, the form-fitting incorporated between the pump housing 2 and the terminal housing 3 is. The central opening 7 of the plate 6 forms the suction mouth of the pump or the suction opening of the pump housing.

Substantially aligned with the pump chamber is separated by the plate 6, However, fluidly connected through the opening 7, a substantially cylindrical chamber 8 in the connection housing 3 continues. The terminal housing 3 is on the pump housing 2 flanged and fixed by screw, tight and releasably connected to the pump and thus the motor housing 2, 1.

The construction of the connection housing 3 can be seen with reference to FIGS. The to Pump housing 2 towards open chamber 8 is on the adapter housing 4 out facing side completed by an end wall 9. Within this front wall 9 three passages are provided, two of which are based on the Impeller axis lie approximately at the same height and designed as suction nozzle 10 and 11 are, with the suction nozzle 10 for the space heating supplying Heating circuit and the suction nozzle 11 for the hot water heating circuit is provided. The third intermediate opening is as a connecting piece 12 formed and used to connect a safety valve.

The located within the chamber 8 parts of the suction nozzle 10 and 11 are as Elbow 13 is formed, as well in Fig. 7a in not built-in position can be seen. Thus, the terminal housing 3 injected without lost cores can be, these pipe bend 13 after the actual shaping of the housing 3 inserted and by welding to the rest of the housing 3, in particular connected there inwardly projecting nozzle. The in Fig. 7a forwardly facing sides of the pipe bend 13 are closed. These Visible annular lugs are for handling purposes only Assembly.

At the cylindrical part of the terminal housing 3 closes down in the essential cuboid housing part 14, said housing part 14 after is open at the bottom and is connected via an opening with the chamber 8. Through this opening 8, a lever 15 is sealingly performed, at the in the chamber 8 befindlichem end is a sealing body 16 which, depending on Position closes one of the two pipe bend 13 and the other releases or vice versa, so that the chamber 18 either with the suction nozzle 10 or with the suction nozzle 11 is fluidly connected. The lever 15, which is in the range of Opening is pivotally mounted, is at its free end of one Spindle drive applied, which attached by means of a laterally on the housing part 14 Electric motor 17 is driven. About the spindle drive is the pivoting the lever 15 and thus the control of the switching element formed thereby.

The cylindrical part of the terminal housing 3 has at its top a Pipe section 18, which protrudes into the chamber 8 a piece, a closed Has bottom and communicating via a side opening with the Chamber 8 is connected. At the top, the pipe section is open and used a not shown and well known in the heating technology Enlüfters (Air separator) provided.

To the end wall 9 of the terminal housing 3, the adapter housing 4 connects, the is comparatively flat and the motor housing 1, pump housing 2 and Terminal housing 3 block formed laterally and down clearly surmounted. The adapter housing is over laterally on the terminal housing 3 projecting ferrules 19 connected to the terminal housing 3 by screws. How out Fig. 1 and 2 can be seen, the connecting piece 10 to 12 of the terminal housing 3 tightly integrated into corresponding connection openings of the adapter housing 4, so that the connection of the unit, once from the connection of the pressure port 5, exclusively on the adapter housing 4 takes place. Because the Component arrangement within a heating boiler at almost all manufacturers basically the same, only distances of the connections and dimensions differ, by variation of only the adapter housing 4, the unit manufacturer specific be adapted without these other parts 1, 2 and 3 vary to have to.

In the illustrated adapter housing 4, for example, a dirt separator 20 provided and an external safety valve 21. Furthermore, the adapter housing 4 downwardly projecting bolts 22, with which the adapter housing 4 and thus the entire unit within the heating system a cover plate 23 shown in FIG. 2 can be fastened. Furthermore, the Adapter housing laterally a mounting base 24 for a plate heat exchanger 25th on.

The function of the above-described unit results in particular from the Figures 1 to 3. The discharge nozzle 5 is connected via a line 26 to the boiler (Primary heat exchanger) 27 connected to the heating system. The boiler 27 feeds each according to the switching position of the sealing body 16, either the space heating certain heating circuit 28 or the intended for hot water Heating circuit 29, which includes the plate heat exchanger 25, the hot water connections marked with 30 and 31. Furthermore, between the Output of the boiler 27 and the suction side of the pump, a bypass line 32nd provided within the adapter housing 4 in a spring-loaded Valve opens. The above-described assembly is shown in Fig. 3 by the 33rd labeled rectangle symbolizes each point in this graph represents a line connection. This graph in conjunction with FIG. 2 shows quite clearly how far it has been achieved by the unit according to the invention, almost all line connections in the unit or in their immediate To integrate proximity. At the mounting base 24 of the adapter housing 3 opens the Coming from the plate heat exchanger 25 return line 24 directly. The Return line 35 of the heating circuit 28 opens below the terminal housing. 3 on the not visible in Fig. 2 side of the adapter housing 4 (see Fig. 1). About that In addition, at the top of the adapter housing 4 is still a terminal 36 to Connection with a surge tank 37 and possibly another Connection for a pressure gauge 38 is provided.

The structural unit according to FIG. 8 differs from the one described above in that that it is not provided for connection to the adapter housing 4. The inside Parts of the suction nozzles 10a and 11a are therefore as straight pipe sections formed, however, have the same function within the chamber 8 as the Pipe elbow 13. In this embodiment, in which the suction nozzle 10a and 11a are arranged laterally opposite transversely to the impeller axis, are the further connection piece 12a, etc., all in a plane transverse to the impeller axis, with the exception of the pressure port 5.

LIST OF REFERENCE NUMBERS

1 -

motor housing

2 -

pump housing

3 -

junction box

3a -

Terminal housing according to FIG. 8

4 -

adapter housing

5 -

pressure port

6 -

annular plate

7 -

central opening

8th -

chamber

9 -

bulkhead

10 -

Suction nozzle of the heating circuit for room heating

10a -

Suction nozzle of the heating circuit for the space heating according to FIG. 8

11 -

Suction nozzle of the heating circuit for hot water preparation

11a -

Suction nozzle of the heating circuit for hot water preparation according to Fig. 8

12 -

connecting branch

12a -

Connection piece according to FIG. 8

13 -

elbow

14 -

housing part

15 -

lever

16 -

sealing body

17 -

electric motor

18 -

pipe section

19 -

ferrule

20 -

dirt separator

21 -

safety valve

22 -

bolt

23 -

Cover plate

24 -

mounting base

25 -

Plate heat exchanger

26 -

management

27 -

boiler

28 -

Heating circuit for space heating

29 -

Heating circuit for water heating

30 -

Water connection

31 -

Water connection

32 -

bypass line

33 -

unit

34 -

Return line

35 -

Return line

36 -

Connecting piece for the manometer

37 -

Surge tank

38 -

manometer

Claims (11)

1. An assembly for a compact heating installation, in particular for a gas heater with two heating circuits (28, 29), one for room heating (28) and one for the provision of warm water (29), with:

   a centrifugal pump unit with:

   a motor housing (1) and

   a pump housing (2) which comprises a pressure union (5) and a suction port (7),

   wherein the compact heating installation comprises further a connection housing (3) connecting to the pump housing, the connection housing (3) comprising

   an air separator,

   a switch organ (15, 16) for acting upon the one or the other heating circuit,

   as well as at least two suction unions (10, 11),

   wherein

   the connection housing (3) comprises a central chamber (8)

   into which the suction port (7) of the pump runs,

   in which the switch organ (15, 16) is arranged and

   into which two suction unions (10, 11) which may be acted upon by the switch organ (15, 16) run,

   wherein an air separator is provided or connected in the upper region of the chamber,

   characterised in that

   an electric motor (17) controlling the switch organ (15, 16) is arranged laterally on the connection housing (3).
2. An assembly according to claim 1, characterised in that the chamber (8) of the connection housing (3) has an essentially cylindrical shape, and is arranged aligned to the pump housing (2), preferably axially equal to this.
3. An assembly according to one of the preceding claims, characterised in that the pump housing (2) as an essentially annular component is incorporated between the motor housing (1) and the connection housing (3), wherein the pump space is separated from the chamber (8) of the connection housing (3) by way of an annular plate (6) which is incorporated with a positive fit.
4. An assembly according to one of the preceding claims, characterised in that the parts (13) of the suction union (10, 11) which are located in the chamber (8) are inserted into this and are connected to this preferably with a material fit.
5. An assembly according to one of the preceding claims, characterised in that the connection housing (3a) comprises two oppositely lying suction unions (10a, 11a) which are arranged lying essentially transversely to the impeller axis of the pump.
6. An assembly according to one of the preceding claims, characterised in that the connection housing (3) comprises two suction unions (10, 11) which are arranged next to one another at the end-face and which are formed within the chamber (8) as pipe-bends (13).
7. An assembly according to one of the preceding claims, characterised in that an adapter housing (4) connects to the connection housing (3) at the end-face, with which the assembly (33) may be fastened within the heating installation and may be adapted to its pipe connections.
8. An assembly according to one of the preceding claims, characterised in that further connections (36) for a bypass, for a pressure measurement means (38), for a pressure relief valve (21) or likewise are provided on the connection housing (3) or on the adapter housing (4).
9. An assembly according to one of the preceding claims, characterised in that a dirt separator (20) is provided on the adapter housing (4).
10. An assembly according to one of the preceding claims, characterised in that the pump housing (2), where appropriate the annular plate (6), the connection housing (3/3a) and where appropriate the adapter housing (4) are designed as plastic injection moulded parts manufactured without a lost core.
11. An assembly according to one of the preceding claims, characterised in that the adapter housing (3) forms an assembly base (24) for a plate heat exchanger (25) of the heating installation.

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