EP2093516B1 - Component for a compact heating system - Google Patents

Abstract

The component (1) has a plate-type heat exchanger (12), whose one side is flow-through by a heating circuit and other side is flow-through by another heating circuit. A continuous flow controller (22) is provided before or behind the heat exchanger in a flow direction of an industrial water line. Partial components are attached to the heat exchanger. One of the partial components comprises a centrifugal pump in a common housing. A blind-shaped flexible element i.e. O-ring, is arranged in an area of a housing partition.

Description

The invention relates to a structural unit for a compact heating system with the features specified in the preamble of claim 1.

Such units are state of the art ( EP 1 528 330 B1 ) and are used to accommodate the numerous housed in such a compact heating system components and assemblies and to handle together with the assembly as a whole. While the heat transfer medium for space heating, which is usually formed by water is heated in a typically above the unit in the heating system arranged primary heat exchanger and from there into the installed inside the house secondary heat exchanger in the form of radiators, the domestic water is heated via a Heat exchanger, which forms part of the assembly and which is typically formed as a plate heat exchanger. In this case, the line coming from the primary heat exchanger is usually separated from the space heater and connected to the plate heat exchanger by means of a priority circuit in the removal of hot water. The heat transfer medium then flows through the plate heat exchanger in one direction, whereby the process water is passed in the opposite direction. For the flow through the heat transfer medium part of the unit forming circulating pump is provided. Since the connection to the space heating is disconnected via a valve in the case of hot water extraction, quasi-stationary states result within the then remaining circuit, so that for a given pump output the heat transfer medium is always passed through the heat exchanger at a constant speed. However, the service water, which is performed on the other side of the heat exchanger in countercurrent, is subject to fluctuations, be it the pressure fluctuations in the water supply network or the fluctuations that occur in that at the sampling point, the nozzle is only partially opened. Both, however, has the consequence that the hot water temperature changes, which may lead to the fact that the hot water removed is not hot enough or on the other can lead to a scalding danger when too little hot water flows. To avoid major malfunctions a flow meter is arranged in the unit in a service water, which always ensures by means of a corresponding control that a minimum amount of hot water flows through the heat exchanger, otherwise diverted the heat transfer or the heating of the primary heat exchanger is turned off.

Out EP 1 884 720 A1 includes a generic unit to the prior art, in which for controlling the amount of hot water flowing through the unit is provided in its flow cross section variable throttle body for controlling the temperature of the service water. This throttle is integrated in a part of the unit, their construction is technically complex.

Against this background, the invention has the object, a generic unit structurally simpler form.

This object is achieved in a generic unit by the features listed in the characterizing part of claim 1. Advantageous embodiments of the invention are specified in the subclaims, the following description and the drawing.

The assembly according to the invention for a compact heating system with two hot circles, one for the domestic water heating and one for space heating, has a heat exchanger for domestic water heating, one side of which a heating circuit and the other side of the hot water can be flowed through. In the service water pipe in front of or behind the heat exchanger an externally adjustable flow regulator is provided in the unit in the flow direction. According to the invention it is provided to provide two side by side, preferably vertically arranged line sections in this sub-assembly or possibly also as a separate component, which are connected by a component receiving at least parts of the flow rate regulator, in which the flow is deflected by about 180 ° , This construction of the line sections lying parallel next to each other is particularly favorable in terms of tools, since the cores necessary for the production of the line sections can be formed as drawing cores which are to be pulled in the same direction. These line sections are connected by a component that deflects the flow by 180 °, which absorbs a majority of the parts of the flow rate regulator. In this case, the flow regulator is typically designed so that in the component an externally operable control member for adjusting the flow rate is arranged. It can therefore be set after installation of the unit and commissioning of the compact heating system in a simple manner by the expert on site, the flow rate, which ultimately determines the temperature of the hot discharged service water.

The basic idea of the present invention is therefore to provide an externally adjustable flow regulator in the assembly in order to control the flow rate of the process water, i. ensure largely independent of external influences that always a constant amount flows through the heat exchanger, so that at least when the bleed valve is fully open, always tap water is removed at a substantially constant temperature, once apart from the temperature fluctuations of the cold process water, which do not remain without influence on the temperature of the warm service water. The flow regulator in the assembly, however, essentially makes it possible to compensate for pressure fluctuations in the supply network in their effect on the hot water temperature and to enable an independent hot water supply in a structurally simple manner. Although flow rate regulators with predefined flow rates are state of the art, they are of little use for the stated purpose since they can not be adapted to the local conditions. For example, if the gas supply pressure is too low, it may be necessary to regulate the flow rate to a relatively small value to ensure that the process water exits the system at a minimum temperature. The solution according to the invention makes this possible by means of an externally adjustable flow rate regulator, wherein from the outside in the sense of the present invention means that the adjustment can take place in the installed state, typically after opening the front panel of the system. The setting can be done in a simple mechanical form, for example by means of a knurled screw or in electronic form, for example by means of a knob or slide control.

Advantageously, the flow regulator is arranged in the flow direction of the process water upstream of the heat exchanger.

Conveniently, a plate heat exchanger is used as a heat exchanger, as is quite common in compact heating systems of this type. According to an advantageous embodiment of the invention, connects to such a plate heat exchanger at least one sub-assembly, which according to the invention advantageously comprises a centrifugal pump and the flow regulator, preferably with at least a portion of the flow rate regulator in a common housing. Such an arrangement is particularly favorable if, what can be provided according to the invention, two sub-assemblies connect to the plate heat exchanger and are mechanically connected by this. Then, the arrangement of the flow regulator in the centrifugal pump having sub-assembly is structurally simple and convenient, because then in the other sub-assembly typically a change-over valve is provided which limits the constructive open spaces on that side significantly.

In this case, the entire mechanism of the flow rate regulator is expediently integrated in the component which deflects the flow through 180 °, whereas the elastic diaphragm cooperating with this mechanism is incorporated in the area of the housing division or of the adjoining component and advantageously provided in the form of an elastic O-ring can. The arrangement in the region of a housing division is therefore of particular advantage, because it is free of undercuts and thus easy to implement in terms of tools. In addition, the elastic element can be easily replaced without having to disassemble the component itself.

Of the two line sections, which are connected by the flow rate regulator comprehensive component or partially comprehensive component, advantageously includes one to the Wörmetauscher whereas the other line section advantageously has a flow meter, the latter line section can be made comparatively long in this arrangement, which enables the arrangement of a vortex flow meter which can be produced cost-effectively, a high measuring accuracy and has long term stability. The reassurance required for this purpose can be realized in the non-adjoining the heat exchanger line section by appropriate length training.

Such a flow meter which operates according to the vortex principle is then advantageously arranged in the direction of flow near the end of the other line section, ie at a considerable distance from the flow regulator in order to ensure a sufficiently long calming section.

It is particularly advantageous if the juxtaposed line sections are arranged approximately vertically in front of the plate heat exchanger and next to the centrifugal pump in the installed position. In this way, the line connection of a line section can be realized in a structurally simple way to plate heat exchanger, wherein the adjacent terminal of the plate heat exchanger can be directly connected to the suction side of the pump line. Such an arrangement allows on the one hand the opposite flow around the plate heat exchanger and on the other hand, the arrangement of the circulation pump in the return to the primary heat exchanger, which is particularly favorable in terms of temperature level.

According to a structurally particularly advantageous embodiment, the subassembly has at least one subsequent to the plate heat exchanger arcuate channel. Preferably, however, both subsequent to the plate heat exchanger channels of this sub-assembly are arcuate, so that they can be realized from one side of the tool with swivel cores. Such pivot cores enable the lateral offset of the lines to each other without causing a further pulling level of the cores. It is expediently one of the arcuate channels to the suction side the pump and the other arcuate channel are connected to the vertical line section leading to the flow regulator.

According to an advantageous embodiment of the invention, the leading from the flow regulator to the plate heat exchanger line section on an opening which is conductively connected to the suction side of the pump. Such an opening connected to the suction side of the pump allows the space-saving and favorable arrangement of a filling device for the heating circuit, in which an interposed valve is opened to direct hot water into the heating circuit when needed, either at start-up or in later operation when liquid is to be replaced. Since such an arrangement is not permitted in all countries, the component can also be formed without an opening by slight variation of the corresponding core, then a line connection is provided, so that the valve can serve as a conventional filling valve for the heating circuit, depending on country-specific regulations. Advantageously, a similar connection with shut-off valve is then provided on the other part of the housing unit on the other side of the plate heat exchanger, so that can be done by attaching a connecting line, the filling of the heating circuit. Alternatively it can be provided between these terminals and a Disconnecteur, ie a fixed line section with therein provided check valve.

In this case, the opening in the vertical line section leading to the flow rate regulator is particularly advantageously designed such that it opens into a valve chamber which is open at the bottom in the installation position and which is provided or designed to receive a valve body or a shut-off body. Such a downwardly open valve chamber is technically particularly favorable to implement, since the sub-assembly typically anyway downwardly open lines for connection to the fixed lines must have and therefore in any case pulling cores must be provided in this direction in the tool.

Fig. 1

in perspektivischer vereinfachter Darstellung eine erfin- dungsgemäße Baueinheit in Einbaulage im Chassis einer Kompaktheizungsanlage,

Fig. 2

eine perspektivische Ansicht der Baueinheit,

Fig. 3

eine Draufsicht auf die Baueinheit,

Fig. 4

eine Ansicht von vorne auf die Baueinheit,

Fig. 5

eine Ansicht von der ein Einbaulage rechten Seite auf die Baueinheit,

Fig. 6

eine Ansicht von der in Einbaulage linken Seite auf die Baueinheit,

Fig. 7

die einen Bypass bildenden und die Teilbaueinheiten ver- bindenden Bauteile in perspektivischer Darstellung,

Fig. 8

eine Ansicht auf die Bauteile gemäß Fig. 7 in Einbaulage gesehen von vorne,

Fig. 9

einen Schnitt längs der Linie A-A in Fig. 8,

Fig. 10

eine perspektivische Ansicht des Druckreglers,

Fig. 11

den Druckregler gemäß Fig. 10 im Schnitt,

Fig. 12

den Stellkörper des Druckreglers in Ansicht,

Fig. 13

einen Längsschnitt durch die parallel nebeneinander ver- laufenden Leitungsabschnitte der ersten Teilbaueinheit,

Fig. 14

einen Längsschnitt durch die erste Teilbaueinheit im Be- reich der Anschlussstutzen und

Fig. 15

ein hydraulisches Schaltbild der Heizungsanlage mit Bau- einheit.

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

Fig. 1

in a perspective simplified representation of an inventive unit in installation position in the chassis of a compact heating system,

Fig. 2

a perspective view of the unit,

Fig. 3

a plan view of the unit,

Fig. 4

a view from the front of the unit,

Fig. 5

a view from the one installation position right side on the unit,

Fig. 6

a view from the left in the mounting position on the unit,

Fig. 7

the components forming a bypass and connecting the sub-assemblies in a perspective view,

Fig. 8

a view of the components according to Fig. 7 seen in installation position from the front,

Fig. 9

a section along the line AA in Fig. 8 .

Fig. 10

a perspective view of the pressure regulator,

Fig. 11

the pressure regulator according to Fig. 10 on average,

Fig. 12

the actuator of the pressure regulator in view,

Fig. 13

3 shows a longitudinal section through the line sections of the first substructure running parallel to one another,

Fig. 14

a longitudinal section through the first sub-assembly in the area of the connecting piece and

Fig. 15

a hydraulic circuit diagram of the heating system with construction unit.

The assembly 1 shown in the figures is arranged in the installed position in a chassis 2, which accommodates all components of the compact heating system and is attached to its rear wall 3 typically hanging on a wall or can be fixed floor-mounted or ceiling-mounted in providing a corresponding frame. The assembly 1 is arranged in the lower part of the chassis 2 and has four downgoing outgoing lines 4, 5, 6 and 7, which lie in a row parallel to the rear wall of the chassis 2 and to which the house-side water-carrying lines are connected. The upper part of the assembly 1 is, as usual in these devices, for receiving a burner and a primary heat exchanger arranged above it, these components are in Fig. 1 away. The assembly 1 has a right side in installation position upwards to the primary heat exchanger outgoing line 8, and a left side arranged, coming from the top of the primary heat exchanger line 9. Centrally centrally, a gas line 10 is guided, which is arranged in front of the unit 1 and in a likewise in front of the unit. 1 arranged valve unit 11 opens, which controls the gas supply to the burner.

The assembly 1 has a plate heat exchanger 12, which is arranged parallel to the rear wall 3 and is tabular. In the installation position, a first sub-assembly 13 shoots from the front on the plate heat exchanger 12 and a second sub-assembly 14 on the left side. The sub-assemblies 13 and 14 are essentially made of plastic injection molded bodies and arranged so that their mechanical connection substantially over the existing metal Plate heat exchanger 12 takes place.

The cable routing within the unit 1 and within the compact heating system results in detail Fig. 15 , The flowing back from the return of the space heating water passes through the right in the installed position line connection in the line 7 and thus in the first sub-assembly 13, which includes, inter alia, a centrifugal pump 15 and an air separator 16. The line 7 opens into the suction chamber of the centrifugal pump 15, to which the air separator 16 connects at the top. The discharge nozzle of the pump 15 is connected to the leading to the primary heat exchanger line 8. The pump housing and the remaining lines of the first sub-assembly 13 are formed by an injection-molded component. The centrifugal pump 15 has, as usual in such units, a flanged, in the installed position accessible from the front electric motor 17, the terminal box 18 is disposed at the top of the motor housing.

In installation position from the front ( Fig. 4 Seen to the left of the pump 15 are two parallel to each other side by side in front of the plate heat exchanger 12 vertically arranged line sections 19 and 20 are provided, of which the left, arranged by the pump 15 with spaced line section 19 vertically down to the line 6 of the unit 1 leads or forms this. About this line 6, the in-house service water pipe is connected. In this line section 19 is near the beginning of a line in Fig. 13 provided in the flow projecting obstruction 40 and provided in the flow direction at a distance behind a differential pressure sensor 41 which is provided in a direction perpendicular to the line section 19 connecting piece as removable sensor unit 21. This is a flow meter which works according to the vortex principle and detects the flow velocity of the process water flowing into the unit 1.

At the upper end of the line section 19 includes a flow diverting by 180 ° component 22, which connects the line section 19 with the right in the installed position next to it between pump 15 and line section 19 arranged right line section 20. The component 22 comprises a flow regulator, with which the flow rate is controlled, so that it is substantially independent of the line pressure. For this purpose, a pin-shaped actuating body 23 in the component 22 is arranged in alignment with the line section 20. The adjusting body has at its upper end a tool holder, here a square, with which it can be rotated about its longitudinal axis. The adjusting body 23 is mounted by means of a thread in the component 22, so that depending on the direction of rotation a flow-limiting provided with axis-parallel groove-like channels cone 24 more or less in an elastic receptacle 25 (see Fig. 13 ) can be inserted, which is incorporated at the upper end of the right line section 20. By turning the actuator 23 so the flow rate can be adjusted from the outside. The tool holder is easily accessible even when installed after opening the front panel. Instead of the tool holder, a knurling wheel or the like can be provided, with which the desired value of the controller is adjustable. Such flow rate regulators count to the state of Technology, which is why their function is not described in detail here. The sealing of the actuating body 23 to the outside via a arranged on the actuating body 23 O-ring. The component 22 is fastened by means of screws to the line sections 19 and 20 laterally projecting projections.

The installation in the lower end of the line section 20 is connected via an arcuately guided in the sub-assembly 13 channel line section 42 with the lower right in the installed position of the plate heat exchanger 12. The overlying upper port of the plate heat exchanger 12 is connected via a likewise arcuate line section 43 with the suction chamber of the pump 15. These line sections 42 and 43 are arc-shaped, so that they can be formed by pivot cores from the back of the sub-assembly 13, while allowing a certain lateral offset.

The line section 42 has an opening at the bottom, which lines lead this line section 42 with a vertically downwardly leading channel 44, which formed widened down and forms a receptacle 45 for a valve 46, the valve body 47 via a from the outside between the Connection piece for the cold service water and the connection piece for the return of the heating water is arranged and accessible. This valve 46 has a sealing body 48 near the upper end of the valve body 47, which closes or opens the channel 44 depending on the position of the valve and then over the space formed by the receptacle 45 with a subsequent back within the sub-assembly 13 to the bypass line line and thus with the return side of the heating circuit combines. By means of this valve 46, the hot water line can be connected to the heating circuit to fill the heating circuit or refill.

Alternatively, the sub-assembly 13 may be formed by correspondingly changing the take-up 45 and the channel 44 forming die core of the tool so that an opening between the channel 44 and the line section 42 is not formed. Then, the valve 46 is modified so that it forms only a connecting piece, which is connected depending on the position of the valve body 47 to the heating circuit or is closed off in contrast. This nozzle is then also used to fill or refill the heating circuit with water and is either fixed via a Disconnecteur, d. H. connected via a line with non-return valve located therein with the hot water side of the other, in installation position left sub-assembly 14 or via a hose-like line with a corresponding connection to the sub-assembly 14, which is also equipped there with a shut-off valve.

The right-hand conduit section 20 adjoins the lower right-hand connection of the plate heat exchanger 12 in the installed position so that the cold process water flows into the lower right-hand connection of the plate heat exchanger 12, flows through this to the lower left connection and there in a line part bent downwards through 90 ° opens, which forms at the end of the line 5 for emerging from the unit 1 warm hot water. This hot water is heated by heating water flowing countercurrently from the upper left port of the plate heat exchanger 12 to the upper right port. The upper right-hand connection is connected via a line section to the suction chamber of the pump 15 of the first sub-assembly 13.

The emerging from the primary heat exchanger hot heat transfer medium passes through the line 9 via a line section 26, which is part of the second unit 14 and seen in the installation position extends down and behind in an arc (s. Fig. 2 The receptacle 27 lies with its axis parallel to the plate heat exchanger 12 and at right angles askew to the impeller axis of the centrifugal pump 15. The recording is to the left in installation position from the left side a closure lid 29 accessible after removing the switch body can be pulled out of the receptacle side.

Center of the receptacle 27 opens the line section 26, depending on the switching position of the switching body of the switching valve 28, the coming from the primary heat exchanger line 9 connects with the line 4 for the flow of space heating or with the upper left in the installation position of the plate heat exchanger 12 for heating the service water , Accordingly, the conduit 4 close to the open end of the receptacle 27 substantially down to this, whereas the line section 26 adjacent thereto, substantially from above and front and the plate heat exchanger 12 leading line near the closed end of the receptacle 27 connects.

The switching valve 28 is controlled by an electric servomotor 30, which is above the plate heat exchanger 12, however, arranged in front of this and the axis of rotation lies in a vertical plane in which the longitudinal axis of the receptacle 27 is seconded. The switching valve 28 with the associated servomotor 30 is not described in detail here, it is so far as an example EP 04 026 233 A1 referenced where such a valve is described in detail.

The second sub-assembly 14, whose basic structure is also formed of a plastic injection molded part, thus includes the switching valve 28 with the corresponding line connections and is firmly connected to the left in the installed position line connections of the plate heat exchanger 12, thus including the line 5. Mechanically, the first sub-assembly 13 and the second sub-assembly 14 substantially connected to each other via the plate heat exchanger 12, but also connect other compounds, such as the bottom plate of the chassis 2 and a bypass line, but which are connected so that they in the longitudinal direction of the plate heat exchanger 12 (in installation position in horizontal Direction) are movably guided in order to avoid the introduction of thermal stresses due to different material expansions.

To the line 4 for the flow of the space heating closes the back with a line section 31 to a bypass line 32, which connects the second sub-unit 14 with the first sub-unit 13 and laterally connected to the first sub-unit 13 in the region between plate heat exchanger 12 and the line sections 19 and 20 and thus forms a connection to the suction region of the pump 15. The line section 31 connects to a perpendicular thereto in the same plane extending line portion 33 which extends in addition to the plate heat exchanger 12 in alignment with it. This is angled in the installed position on the right side by 90 ° to the front and there goes into a line section 34 which is open toward the front and serves to receive a valve 35 in the form of an adjustable pressure relief valve. Near the front end of the line section 34, a line section 36 connects to the right, which extends parallel to the plate heat exchanger 12 in front of it. A back of this cantilevered support 37 comes to the bottom of the plate heat exchanger 12 to the plant. At this line section 36 in turn closes perpendicular to a fitting 38 receiving and thus open to the front line section on, which is designed here for example as a filling valve for filling the heating system with water. The right end of the line section 36 is provided with an O-ring 39 and guided only in the direction transverse to the longitudinal axis of the line section 36 in the corresponding aligned receiving the first sub-assembly 14 so that a movement in the axial direction to compensate for tolerances and thermal expansion is possible.

LIST OF REFERENCE NUMBERS

1

- assembly

2

- chassis

3

- back wall

4

- Line for the heating flow

5

- pipe for the warm service water

6

- Line for the cold process water

7

- Cable for the heating return

8th

- Line to the primary heat exchanger

9

- Line from the primary heat exchanger

10

- gas line

11

- Valve unit

12

- Plate heat exchanger

13

- first sub-assembly

14

- second sub-assembly

15

- Centrifugal pump

16

- Air separator

17

- electric motor

18

- Terminal box

19

- Line section left vertical

20

- Line section right vertical

21

- Sensor unit Vortex

22

- component

23

- Actuator

24

- cone

25

- elastic recording

26

- Line section

27

- Recording of the changeover valve

28

- Changeover valve

29

- Cover

30

- servomotor

31

- Line section

32

- bypass line

33

- Line section

34

- Line section

35

- fitting

36

- Line section

37

- Support

38

- fitting

39

- O-ring

40

- obstruction

41

- Differential pressure sensor

42

- Line section

43

- Line section

44

- Channel

45

- Admission

46

- Valve

47

- valve body

48

- sealing body

Claims (13)

1. A construction unit for a compact heating installation with two heating circuits, one for the heating of service water and one for room heating, wherein the construction unit comprises a heat exchanger (12) for heating service water, through one side whereof a heating circuit can flow and through the other side whereof service water can flow, wherein a flow rate controller (24, 25) is provided in the construction unit (1) in the service water line upstream or downstream, in the flow direction, of the heat exchanger, characterised in that two line segments (19, 20) disposed beside one another are provided, which are connected by conduit to one another by means of a component (22) comprising at least parts of the flow rate controller adjustable from the exterior, in which component the flow is deflected through approximately 180°.
2. The construction unit according to claim 1, characterised in that the flow rate controller (24, 25) is disposed, in the flow direction, upstream of the heat exchanger (12).
3. The construction unit according to one of the preceding claims, characterised in that the heat exchanger is a plate heat exchanger (12), which is followed by at least one part construction unit (13, 14), and that this part construction unit (13) comprises a centrifugal pump (15) and at least a part (25) of the flow rate controller preferably in a common housing.
4. The construction unit according to one of the preceding claims, characterised in that the two line segments (19, 20) disposed beside one another are disposed vertically in the installed position.
5. The construction unit according to one of the preceding claims, characterised in that an externally actuatable control element (23) for adjusting the flow rate is disposed in the component (22).
6. The construction unit according to one of the preceding claims, characterised in that, in the region of the housing partition, a diaphragm-type component (25) is incorporated, which is formed by an elastic element (25), preferably an O-ring.
7. The construction unit according to one of the preceding claims, characterised in that the one line segment (20) follows on from the heat exchanger (12) and the other line segment (19) comprises a flowmeter (40, 41).
8. The construction unit according to one of the preceding claims, characterised in that the flowmeter (40, 41) is one operating according to the vortex principle and is disposed, in the flow direction, close to the start of the other line segment (19).
9. The construction unit according to one of the preceding claims, characterised in that the line segments (19, 20) disposed beside one another are disposed, in the installation position, approximately vertical upstream of the plate heat exchanger (12) and beside the centrifugal pump (15).
10. The construction unit according to one of the preceding claims, characterised in that the part construction unit (13) comprises at least one, preferably two, arc-shaped channels (42, 43) following on from the plate heat exchanger.
11. The construction unit according to claim 10, characterised in that one of the arc-shaped channels (43) follows on from the suction side of the pump (15) and the other arc-shaped channel (42) follows on from the vertical line segment (20) leading to the flow rate controller (24, 25).
12. The construction unit according to one of the preceding claims, characterised in that the line segment (42) leading from the flow rate controller (24, 25) to the heat exchanger (12) comprises an opening which is connected by conduit to the suction side of the pump (15).
13. The construction unit according claim 12, characterised in that the opening emerges into a valve chamber (45) - in the installed position - preferably open at the bottom which is designed to accommodate a valve body (47) or a shut-off body.

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