EP2309219A1 - Device for influencing the temperature of a liquid medium - Google Patents

Abstract

The device has a heat exchange container (1), in which channels are formed. The channels are discharged directly into a main sewer (5,6). The channels are locked by an immersion pipe (9). The shifting of the immersion tube is carried out on a connective opening (7).

Description

The present invention relates to a device for influencing the temperature of a liquid medium, comprising a heat exchange container, in which together in heat-conducting contact, combined to at least two mutually sealed chambers channels are formed, wherein the channels of a first chamber with the medium, and the channels a second chamber is flowed through by an auxiliary medium of higher or lower temperature, wherein at least one of the media flows into the associated channels via a collecting channel and / or leaves the latter via a collecting channel.

Such a device is already known from the prior art several times. For example, the Japanese shows Document JP 5026588 A a plate heat exchanger with two collecting channels, which are arranged on the supply side and the discharge side. In the supply-side collecting channel, a supply pipe is inserted, which has a plurality of nozzle openings through which the medium to be heated can flow into the channels. Here, a part of the tube is pushed out to increase the number of supplied channels, if necessary. Also this extendable tube has a multiplicity of nozzle openings, via which the medium flowing into the tube can be delivered to the channels. However, there is the problem that the extendable part of the tube must have a smaller diameter than is required with regard to the fixed tube part. As a result, the collected in the extended tube part medium will collect in the area around the extended pipe and thus supply the same time by the extension of the tube channels at a stroke at the same time. It is therefore in the proposed arrangement is a two-stage cascading only.

Basically, the use of heat exchangers, such as for heating domestic water, the problem that the requested amount of heated service water is subject to strong fluctuations. For example, a more moderate amount of hot water may be required first and then the amount increased many times as more consumers enter. Usually, this problem is solved by cascading a plurality of heat exchangers, which are connected in parallel to each other so that the capacity of the assembly can increase rapidly. However, there is regularly the problem that when connecting an additional heat exchanger to the cascade, a strong temperature fluctuation occurs, which must first be corrected again. In addition, arise when switching pressure fluctuations, which are also to be absorbed.

There is therefore a need in the prior art to keep temperature fluctuations and pressure fluctuations as low as possible and to allow a constant supply of hot water, as independent as possible from the requested amount of water. This is the subject of the German patent application DE 3021246 A1 Reference, by indicating a use for the collecting ducts, which favors depending on the pressurization an altered flow behavior and thus a changed distribution behavior within the heat exchanger. At greater pressure, the plates are utilized more evenly and thus achieve a better result at this point.

However, such a system lacks external influence, which ideally should be made possible to improve the result of the regulation. In that regard, the above-mentioned Japanese script is most suitable as a basis for further development, since there can be an influence directly on the flow through the heat exchanger.

Against this background, the present invention is based on the object of specifying a device for influencing the temperature of a liquid medium whose control behavior is improved in the case of an increase or a decrease in the removal compared with the possibilities known in the prior art.

This is achieved by a device for influencing the temperature of a liquid medium according to the features of the main claim. Further useful embodiments of this device can be taken from the subclaims.

As a basis for a regulation, the finding has proved to be crucial that linear with the pressure flow occurring in the sampling system linear transfer area should change in the heat exchanger. This finding implements the device according to the invention in that it provides a heat exchange container in which a number of standing in heat conductive contact channels are included. These channels form two chambers, namely a chamber with the medium to be heated and a chamber with the required for the temperature change auxiliary medium. One possible, particularly illustrative use here is the use of such an arrangement as a fresh water station, is heated in the domestic water for domestic use.

In the example set out below, heating water from a domestic heating system is used as an auxiliary medium which is intended to heat the process water, which circulation circulates in a separate circulation in heat-conducting contact with the process water circuit. For this purpose, two mutually sealed chambers are provided within the heat exchanger, which are intended to prevent hot water and heating water mix with each other and thus the service water is contaminated. The heat-conducting contact between the two media is so far in the heat exchanger, wherein the run in the heat exchanger, separated from each other channels each open a chamber at least on one side into a collecting channel. This collection channel is in this case designed so that a dip tube is longitudinally displaceably arranged in the collecting channel, which engages in such a sealing manner in the collecting channel that the affected orifices of the channels are closed when vorweitem dip tube. For this purpose, it is useful if the dip tube has at least approximately the same outer diameter as the collecting channel has as an inner diameter. By moving the dip tube in the collecting channel Thus, individual channels of the heat exchange container can be released or blocked, and so the capacity of the heat exchanger can be influenced as a whole by switching off and on individual heat exchanger channels. If the immersion tube is now displaced via a control in such a way that the transfer surface within the heat exchanger changes linearly with the pressure flow, this produces a regulation which can keep its pressure and temperature constant even with increasing demand, for example, for heated fresh water. By a further collecting channel on the opposite end of the channels, in which, for example, no dip tube is inserted and the extent serves only as a wide discharge channel, the connected thereto and not blocked on this page, unused channels can also take pressure.

This results in a precisely controllable heat exchanger, for example in the form of a fresh water station, which effectively avoids pressure and temperature fluctuations.

Basically, two alternatives of the embodiment of such a device are conceivable, namely an opening and a closing operation of the dip tube. A closing operation of the dip tube provides that the collecting channel on one side has a connection opening, which opens into the pipe system. Opposite this connection opening lies in the collection channel the dip tube, which is either solid or sealed, but may well be formed as an inwardly open tube. If a massive embodiment of the dip tube is provided, at least one longitudinal bore should be provided in the dip tube for pressure equalization, so that the dip tube readily against the resistance of the medium can be moved. This dip tube has no lateral openings and can be moved in the direction of the connection opening, so that with increasing displacement in the direction of the connection opening channel openings of the collecting channel are increasingly closed and thus progressing advances of the dip tube in the direction of the connection opening so fewer channels are available for the flooding.

In this case, however, the dip tube may be modified so that it releases all channels in a first stop position, but releases at least one channel in a second stop position, so that complete blocking of the device is not provided. This can be done either by the fact that the actuator moving the dip tube has its stop at a position in which the dip tube is not fully extended and thereby leaves the last channel mouth before the connection opening, or the free end of the dip tube is so provided with openings that in spite of advancing the dip tube before the last channel this can be flowed through because of the provided openings.

The alternative to this is provided by a dip tube, which is received in the connection opening in such a way that the connection opening is sealed to the outside with the tube. Inwardly, the dip tube is hollow in this embodiment, so that the medium can flow through the hollow dip tube. In this case, the dip tube, starting from a complete open position, which provides for at least almost complete retraction of the dip tube through the connection opening, in the direction of the connection opening opposite side of the collecting channel Successively close the mouths of the channels to reduce the capacity of the heat exchange container.

Again, it can be provided insofar that the free end of the dip tube has additional openings in the side area such that even with a stop position of the dip tube before the last channel to be supplied through these openings a supply of this last channel can take place, thus the heat exchange container is not complete can be taken out of service by this stop position. In particular, it lends itself to run slit the free end of the dip tube, after such a design manufacturing technology is very easy to manufacture.

In particular, if the dip tube is a feed tube, the supply of the medium to the dip tube can be realized, for example, by providing a pressure vessel opposite the collection channel, beyond the connection opening, into which the dip tube protrudes. At the projecting into the pressure vessel end of the dip tube for this purpose openings are provided, through which the medium can flow into the dip tube and from there into the collection channel or the channels of the heat exchanger. The end face of the dip tube is in this case connected to a push rod, via which an actuator predetermines the position of the dip tube.

In a further development of this embodiment, the pressure vessel can be made in two parts by a partition wall is sealingly connected to the push rod, which divides the pressure vessel into a supply side and a discharge side partial chamber. The supply side partial chamber is with connected to a media supply, while the discharge-side partial chamber is connected for pressure equalization with a discharge-side collecting channel. The pressure of the medium forming on the supply-side sub-chamber can be compensated by diverting a portion of the medium as it exits the heat exchanger and passing it into the second sub-chamber, where it can build up a back pressure on the opposite side of the dividing wall. In particular, the feedback takes place via a return line, which is provided with a damping valve. The return line ensures the required pressure equalization of the two chambers, whereby the position of the dip tube is stabilized again in the sense of a position control.

The actuator, or generally the push rod, a spring is assigned, which adjusts the P-range of a realized so far P-controller. On the primary side, a mechanical coupling is required. In the case mentioned, a control without auxiliary power, that is done without additional servomotor.

For configuring the heat exchange container with collecting ducts and dip tubes, it should be noted that the preferred embodiment provides for providing each supply or discharge of each chamber with such a displaceable dip tube, which are ideally adjusted in parallel via a common actuator. This ensures that both the medium and the auxiliary medium flow through the heat exchanger to the same extent and thus develop the greatest efficiency. It is also possible, however, any other configuration, for example, it is also conceivable to realize both the supply and the discharge of both media via a dip tube. Conversely, it would also be sufficient merely to provide, for example, the supply of the medium, but not that of the auxiliary medium via a dip tube.

For example, the heat exchanger may be a plate heat exchanger whose plates form a plate stack, between which the individual channels are formed. In each case, adjacent interspaces are assigned to different chambers, ie, isolated from one another such that the media flowing in the respective adjacent chambers can not mix with one another. For better release of heat from one medium to another, the individual plates have a structure; In particular, the waveform of the plates has proven to be particularly helpful for this purpose.

The invention described above will be explained in more detail below with reference to an embodiment.

Figur 1

eine erfindungsgemäße Vorrichtung mit einem nicht durchströmten Tauchrohr in einer seitlichen Querschnittsdarstellung,

Figur 2

einen Plattenstapel innerhalb der erfindungsgemäßen Vorrichtung mit den Zuführungen und Abführungen eines Medien- und eines Hilfsmedien-Kreislaufs in einer perspektivischen Darstellung, sowie

Figur 3

eine erfindungsgemäße Vorrichtung mit einem durchströmten Tauchrohr in einer seitlichen Querschnittsdarstellung.

Show it

FIG. 1

a device according to the invention with a non-flow-through dip tube in a lateral cross-sectional view,

FIG. 2

a plate stack within the device according to the invention with the feeds and discharges of a media and an auxiliary media circuit in a perspective view, and

FIG. 3

a device according to the invention with a flow-through dip tube in a lateral cross-sectional view.

Fig. 1 shows a heat exchange container 1, in which a plate stack 12 is arranged. The plates of the plate stack 12 form within the heat exchange container 1 channels 2, which are alternately combined into two chambers so that the channels of a first chamber 3 with the channels of a second chamber 4 can not communicate. However, the channels of the first chamber 3 are in heat conducting contact with the channels of the second chamber 4. The first chamber 3 is traversed by hot water, which is to be heated by means of the heat exchanger. The second chamber 4, however, is flowed through by heating water, which is suitable due to its high temperature to heat as an auxiliary medium, the medium service water using the heat exchanger. In order to prevent contamination of the service water, the sealing of the first chamber 3 with respect to the second chamber 4 is essential, so that the first chamber 3 has a separate from the second chamber 4 and a separate discharge supply. In the Fig. 1 is, as later in the Fig. 3 showing the dhw cycle, where the heating water cycle works completely analogously.

On both sides of the heat exchange container 1, the channels 2 open into collecting channels 5 and 6, wherein a first collecting channel 5 is connected via a first connection opening 7 with the hot water supply, while a second collecting channel 6 communicates via a second connection opening 8 with the service water discharge. The service water is thus in the cold state through the first port 7 in the first Passage channel 5 passed, from there via the channels 2, which are in heat-conductive contact with the second chamber 4 and the hot water is thus heated in their passage, conveyed into the second collection channel 6 and provided from there as hot water through the second connection opening 8 , In the case of only a small demand for hot water, the use of fewer channels of the first chamber 3 is sufficient because of the low pressure flow so that it makes sense to take the remaining channels out of operation. For this purpose, a dip tube 9 is provided in the first collecting channel 5, which is mounted so displaceable in the first collecting channel 5, that the dip tube 9 can cover the mouths of the channels which are connected to the first collecting channel 5, one after the other. By moving the dip tube 9 in the direction of the first connection opening 7, the number of channels 2 charged with the process water is thus reduced; conversely, the number is increased when the dip tube 9 is withdrawn from the first connection opening 7. The movement of the dip tube 9 via a push rod 10 with a linear motor 11. However, other actuators are conceivable at this point, so for example, a rotary motor can be used, which actuates a threaded rod. The solid executed in this example dip tube 9 has longitudinal bores 28, which provides a lower resistance of the dip tube 9 against the medium and thus allows pressure equalization.

Now increases the pressure flow in the supply line, a control will retract the dip tube 9 so and release more channels that the increase of the pressure flow linearly with the available wall surface of the heating water in the heat conductive contact standing channels increases. Any pressure fluctuations can also be absorbed by the fact that the channels concealed by the dip tube 9 and thus unused communicate with the second collection channel 6 and are at least as far available.

FIG. 2 shows a plate stack 12, as it could be provided in the heat exchange container 1. By the selected perspective view can be seen that a total of four supplies or discharges are present, namely a service water supply 13, a service water discharge 14, a heating water supply 15 and a Heizungswasserabführung 16. In each case communicate only the service water supply 13 and the service water discharge 14 and the heating water supply 15th and the Heizungswasserabführung 16 with each other, so that the extent within the plate stack 12 formed chambers are kept separate from each other. It can also be seen that in this example it makes sense to assign a dip tube 9 to each of the two chambers, which ideally can be set up in direct proximity to one another, so that the two dip tubes can be moved together into corresponding positions. In that regard, it makes sense to assign the service water supply 13 and the heating water discharge 16 each a dip tube 9 to control both circuits in the same way and, if necessary, even move the dip tubes 9 with a common drive.

Fig. 3 shows an alternative embodiment of the already out Fig. 1 known dip tube 9, which serves in contrast to the previously shown dip tube 9 at the same time as a service water supply. The dip tube 9 flows beyond the first Connection opening 7 in a pressure vessel 17, in which a service water supply 13 opens. The service water will flow in this case on the hot water supply 13 into the pressure vessel 17, from there via openings 22 of the dip tube 9 in this flow, leave the dip tube 9 in the example shown via a slotted, free dip tube end 21 and into the first chamber. 3 enter, be heated there and are provided to the consumer via the second collection channel 6, the second connection opening 8 and finally the service water discharge 14. With an increase in pressure, the dip tube 9 is pulled out of the first collection channel 5, so that more channels of the first chamber 3 are free and thus the available heat exchange surface is increased within the heat exchange container 1. In order to realize a position control of the dip tube 9 in this example, this is in addition to a spring 25, which moves the dip tube 9 by means of a push rod 24, also connected via the push rod 24 with a displaceably mounted chamber wall 20, which the pressure vessel 17 in a supply-side partial chamber 18 and a discharge-side partial chamber 19 divided. The discharge-side partial chamber 19 of the pressure vessel 17 is connected via a return line 26 with the service water discharge 14, so that the heated service water can flow at least partially into the pressure vessel 17. In the discharge-side partial chamber 19 thus creates a back pressure against the forming in the supply-side partial chamber 18, increasing pressure flow. In order to achieve a damping of the inflow or outflow of the process water used as a counterpressure and thus to improve the control, the return line 26 is provided with a valve 27 which functions as part of the position control of the dip tube 9. This creates a regulation without auxiliary power.

Thus described above is a device for influencing the temperature of a liquid medium, which thereby experiences better controllability, that pressure and temperature fluctuations are minimized when connecting or disconnecting individual chamber areas of a heat exchanger tank. This is achieved by virtue of the fact that the channels within the heat exchanger are connected to one another via a collecting channel, wherein a dip tube can partially close this collecting channel such that the individual channels, if appropriate also in groups, can be closed and thus put out of operation. In the end, the dip tube is displaced so that the transfer surface within the heat exchanger changes linearly with the pressure flow.

LIST OF REFERENCE NUMBERS

1

Heat exchange tank

2

channel

3

first chamber

4

second chamber

5

first collection channel

6

second collection channel

7

first connection opening

8th

second connection opening

9

dip tube

10

pushrod

11

linear motor

12

plate stack

13

Water supply

14

Water transfer

15

Heating water supply

16

Heating water drainage

17

pressure vessel

18

supply side partial chamber

19

discharge side partial chamber

20

chamber wall

21

free dip tube end

22

openings

23

front

24

pushrod

25

feather

26

Return line

27

Valve

28

longitudinal bore

Claims (15)

Device for influencing the temperature of a liquid medium, comprising a heat exchange container (1), in which mutually in thermally conductive contact, at least two mutually sealed chambers (3.4) combined channels (2) are formed, wherein the channels (2) a first chamber (3) with the medium, and the channels (2) of a second chamber (4) are flowed through with an auxiliary medium higher or lower temperature, wherein at least one of the media via a collecting channel (5) flows into the associated channels and / or leaves them via a collecting channel (6),
characterized in that these channels (2) open directly into the collecting channel (5,6) and the mouths of the channels (2) by means of a collecting channel (5,6) longitudinally displaceably arranged dip tube (9) are successively sealed individually sealed. Apparatus according to claim 1, characterized in that the collecting channel (5) with a connection opening (7) for supplying or discharging the medium or the auxiliary medium communicates, wherein the dip tube (9) of the connection opening (7) opposite the end of the collecting channel (5) from the connection opening (7) is displaceable, wherein the dip tube (9) is preferably solid, but provided with at least one longitudinal bore (28) for pressure equalization executed. Apparatus according to claim 2, characterized in that a displacement of the dip tube (9) on the connection opening (7) to only so far is possible that even the mouth of at least one channel remains free. Apparatus according to claim 1, characterized in that the collecting channel (5) with a connection opening (7) for supplying or discharging the medium or the auxiliary medium communicates, wherein the dip tube (9) in the connection opening (7), this sealingly, in such Direction to the connection opening (7) opposite the end of the collecting channel (5) is received longitudinally displaceable, that in the collecting channel (5) inflowing medium or auxiliary medium flows through the dip tube (9). Apparatus according to claim 4, characterized in that the dip tube (9) is slotted in the region of its free end (21) such that a closure of the mouth of the furthest from the connection opening (7) remote channel is avoided. Device according to one of claims 4 or 5, characterized in that the connection opening (7) connects the collecting channel (5) with a pressure vessel (17), via which the medium or the auxiliary medium is supplied is, wherein the pressure vessel (17) is delimited by a displaceable chamber wall (20) which is sealingly penetrated by a push rod (9) actuating push rod (24) and the pressure vessel (17) in a feed side and a Abführseitige partial chamber (18, 19). Apparatus according to claim 6, characterized in that the immersion tube (9) at its end connected to the push rod (24) end openings (22) for inflow of the medium into the dip tube (9). Device according to one of claims 6 or 7, characterized in that the discharge-side partial chamber (19) for pressure equalization with a discharge-side collecting channel (6) is connected. Apparatus according to claim 8, characterized in that the connection between the discharge-side partial chamber (19) and the discharge-side collecting channel (6) via a return line (26). Apparatus according to claim 9, characterized in that in the return line, a valve (27) is provided for damping the adjusting movement. Device according to one of the preceding claims, characterized in that a position control of the dip tube (9) is realized such that the used, available for the heat exchange wall surface of the channels (2) varies linearly with the pressure flow of the inflowing medium or auxiliary medium. Device according to one of the preceding claims, characterized in that in each case a collecting channel (5, 6) with a longitudinally displaceable dip tube (9) is provided either for supplying or for discharging the medium and the auxiliary medium. Device according to one of the preceding claims, characterized in that the dip tube (9) by means of an actuator (25), such as a linear or a threaded rod driving a rotary motor, preferably supported by a spring mechanism, in its position is adjustable. Device according to one of the preceding claims, characterized in that it is in the heat exchange container (1) is a plate heat exchanger whose channels (12) are formed by two opposing, preferably corrugated or otherwise structured, heat-conducting plates. Device according to one of the preceding claims, characterized in that the medium is service water, in which the auxiliary medium is heating water.

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