WO2008019659A1 - Plate heat exchanger - Google Patents
Plate heat exchanger Download PDFInfo
- Publication number
- WO2008019659A1 WO2008019659A1 PCT/DE2007/001423 DE2007001423W WO2008019659A1 WO 2008019659 A1 WO2008019659 A1 WO 2008019659A1 DE 2007001423 W DE2007001423 W DE 2007001423W WO 2008019659 A1 WO2008019659 A1 WO 2008019659A1
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- WO
- WIPO (PCT)
- Prior art keywords
- heat exchanger
- filter
- hollow filter
- plate heat
- flushing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
- F28F3/083—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning capable of being taken apart
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
Definitions
- the present invention relates to a plate heat exchanger according to the preamble of claim 1.
- plate heat exchangers In plate heat exchangers, a number of profile-embossed thin plates with passage openings lined up form a package of flow gaps that are alternately flowed through by the heat exchanging media. Circumferential seals inserted between the plates ensure that the desired flow through the package is achieved and that it is sealed to the outside. Plate heat exchangers with a compact design should provide a large heat exchange surface with the lowest possible pressure losses.
- Separate filters are, for example, automatic filters F 450 from Schüemann GmbH, Bremen. These are self-cleaning and essentially maintenance-free filters. These have a cylindrical housing with a filter basket arranged coaxially therein. The liquid to be cleaned is fed via an inlet pipe to the interior of the filter basket. The medium to be cleaned flows through the filter basket from the inside to the outside and is removed in purified form via a radial outlet. Laßstutzen removed from the filter housing. The filter basket settles more and more during operation from back to front, so that the flow velocity of the medium in the strainer basket gradually decreases. According to Bernoulli, this means that the pressure in the screen basket rises.
- a differential pressure switch After reaching a certain differential pressure between the screen basket interior and the space surrounding the screen basket, a differential pressure switch triggers a self-cleaning of the filter. This runs in two phases. First, a purge valve is opened, which is arranged in a purge line, which leaves from a rinsing chamber. This is arranged at the end remote from the inlet of the filter and hydraulically connected to the interior of the screen basket. By opening the purge valve, an opening is made with respect to the atmospheric pressure, whereby a purge flow through the interior of the filter basket is triggered. As a result of this purge flow, coarse particles separate from the inner surface of the strainer basket and leave the filter via the drainage line.
- phase 2 of the self-cleaning of the filter the deposits stuck in the perforated filter surface of the filter are also rinsed out.
- the Bemoulli principle is also exploited.
- a flushing disk is inserted from the cistern into the filter basket, which sits on a piston rod, which is pneumatically driven. Between the periphery of this washer and the inside of the filter basket, there is only a small gap, whereby the flow rate of the medium to be filtered is greatly increased in this area. This results in a pressure drop in the interior of the filter basket at this point and thus a flow reversal from the outside of the filter basket in its interior.
- the automatic backflushing filters of the company Georg Schünemann GmbH briefly described above have the following advantages in addition to the self-cleaning effect: Continuation of filtration during self-cleaning, low pressure drop, filter fineness of approx. 0.1 to 10 mm, low flushing volumes and media losses, installation position freely variable.
- plate heat exchangers with separate filters In addition to plate heat exchangers with separate filters but also plate heat exchangers with integrated filters are known. Such plate heat exchangers according to the invention are disclosed, for example, in GB-A 1 207 919 and WO 02/052 215 A1.
- a cylindrical hollow filter is inserted into an inlet channel of the heat exchanger, which is centered by means of spacers, ie arranged concentrically in the inlet channel.
- the annular gap formed thereby between the outside of the filter and the clear width of the inlet channel is chosen in its radial width so that it is not greater than the mesh or hole width of the filter. This should be avoided with perfect filtering of solids flow debris in the inlet channel.
- the inlet channel in which the filter is disposed is extended beyond the end of the plate stack by a pipe stub.
- the filter protrudes into this pipe socket, which is closed by a blind flange. After loosening the blind flange, the filter can be pulled out of the inlet channel for cleaning.
- a flushing line is integrated, which opens into one of the drain pipes of the plate heat exchanger.
- a small bypass flow of the heat exchange fluid constantly flows through the purge line, the size of which can be adjustable by means of a valve incorporated into the purge line.
- the bypass flow is intended to cause solids settled in the filter to dissolve and collect in the area of the filter which is in protrudes the pipe socket. Apart from the fact that the accumulating in the pipe socket deposits bring the bypass flow slowly to dry, this is enough anyway only to remove very coarse particles from the filter.
- the filter sets fast in this solution, so that the filter must be cleaned from time to time depending on the degree of contamination of the incoming heat exchange medium. To do this, remove the filter from the plate heat exchanger. Apart from the expenses for opening the plate heat exchanger and cleaning the filter, the process is interrupted.
- the plate heat exchanger with integrated filter disclosed in WO 02/052 215 A1 has the same disadvantages.
- Object of the present invention is therefore to provide a plate heat exchanger of the generic type available that allows cleaning of the filter without interrupting the heat exchange process, even at high filtration fineness.
- the filter insert of a plate heat exchanger is thus self-cleaning, in which a cleaning device at certain time intervals, the interior of the hollow filter at least partially leaves and removes the deposits on and out of the hollow filter.
- a cleaning device at certain time intervals
- the interior of the hollow filter at least partially leaves and removes the deposits on and out of the hollow filter.
- To trigger the self-cleaning mode of the hollow filter means for differential pressure monitoring or for time interval control are provided in an advantageous embodiment.
- pressure sensors are arranged at the inlet of the hollow filter, specifically on its inside and outside, which, with a corresponding differential pressure, activate the self-cleaning mode. conduct.
- a time interval control can also be provided. If both types of control are used, then it is expedient if the differential pressure monitoring has priority over the time interval circuit.
- the cleaning device consists of a flushing head, which sits on an axially displaceable in the hollow filter piston rod, as well as from a flushing valve, the opening of which generates a flushing flow in the hollow filter.
- the flushing head is designed as a disc which, according to the Bernoulli principle, causes an increase in the speed of the heat exchange medium flowing through the hollow filter between its periphery and the inside of the hollow filter and thus a local pressure drop in the hollow filter.
- This mode of operation corresponds to that of the initially described self-cleaning automatic filter F 450 from Georg Schünemann GmbH.
- the flushing head can be designed as a spray head, can be directed by the spray jets on the inside of the hollow filter. It is expedient if the flushing head in addition to its axial mobility also has a rotational movement about the piston rod.
- the spray head can also be designed so that it can also be used to implement the Bernoulli principle described above.
- the self-cleaning mode of the hollow filter allows it to be equipped with a large filter fineness of, for example, 0.1 mm, so that even relatively fine particles can be filtered out of the heat exchange medium, which increases the service life of the plate heat exchanger.
- FIG. 1 shows a cross section through the lower portion of a plate heat exchanger with a self-cleaning filter cartridge according to a first embodiment of the invention
- Fig. 2 shows a cross section through the lower portion of a plate heat exchanger with a self-cleaning filter cartridge according to a second embodiment of the invention.
- the plate heat exchanger 1 shown in the drawing has heat exchanger plates 2, which are mounted in a frame, not shown, and are clamped by means also not shown clamping screws between two clamping plates 3 and 4, so that the heat exchanger plates 2 are in a package close together.
- Each heat exchanger plate 2 has four inlet and outlet openings, which are not shown in the illustration, and is profiled in the area between these openings. With this profiling, the heat exchanger plates 2 are supported against each other. Furthermore, this profiling ensures an enlargement of the heat exchange surface and for the generation of the heat transfer conducive turbulence of the flow between the heat exchanger plates 2 and for a better distribution of heat exchanging media over the surface of the heat exchanger plates 2. Between the heat exchanger plates 2 inserted circumferential seals provide for a in that the heat-exchanging media can not escape to the outside, but in particular also ensure that the media flows through each other every two pairs of heat exchanger plates separated from one another.
- pipe socket 5 The inflow and outflow of heat exchanging media via pipe socket 5, from which from the drawing due to the illustration only a pipe socket 5 can be seen.
- the pipe sockets 5 are aligned with the outlets and inlets of the heat exchanger plates 2, which form inlet and outlet channels 6 for the heat exchanger media in heat exchanger plates 2 pressed together into a package.
- New to the plate heat exchanger 1 shown in Fig. 1 is a recessed into the inlet channel 6 of the heat exchange media hollow filter 7, which has a circular cross-section in adaptation to the circular inlet and outlet openings of the heat exchanger plates 2 and over the entire length of the package Heat exchanger plates 2 extends.
- the inlet end of the hollow filter 7 is incorporated into the inlet nozzle 5 and the outlet end in a cistern 8, in such a way that a flowing in the direction of arrow 9 in the plate heat exchanger 1 heat exchange medium not bypassing the hollow filter 7 in between the heat exchanger plates. 2 formed flow column 10 can occur.
- the heat exchanger plates 2 are "switched" by the inserted seals so that the heat exchange medium filtered through the hollow filter 7 can enter only every second flow gap 10 formed between the heat exchanger plates 2, as indicated by the arrows 11.
- the heat exchanger plates 2 enters from the top in countercurrent another heat exchange medium, which flows after flowing through the flow column 10 in a not apparent from the illustration outlet channel and leaves through this the plate heat exchanger 1.
- two pressure sensors 12 are arranged in its interior and in the outer space, via which the differential pressure between these two measuring points is determined. After reaching a predetermined differential pressure, a self-cleaning mode of the hollow filter 7 is initiated via a controller. For this purpose, a cleaning device is provided.
- the cleaning device includes a purge line 17, which is flanged to the cistern 8, and has a purge valve 18.
- the flushing valve 18 When the self-cleaning mode is triggered, first the flushing valve 18 is opened, whereby a small flushing flow through the hollow filter 7 sets in. In this phase of the self-cleaning mode, the piston rod 14 is fully retracted, so that the flushing disk 13 is in the cistern 8. Due to the scavenging flow coarse particles that have settled on the filter surface, lifted from this and transferred into the cistern 8, which they leave via the purge line 17. Fine particles that have settled in the perforation of the hollow filter 7 can not be removed by this flushing process. Therefore, a second phase of the self-cleaning mode is initiated. For this purpose, the piston rod 14 and thus also the rinsing disk 13 are retracted into the hollow filter 7, as shown in Fig. 1.
- the embodiment according to FIG. 2 differs from that according to FIG. 1 in that, instead of the rinsing disk 13, a spray head 19 is used in the cleaning device.
- This has spray nozzles, over which cleaning jets 20 can be directed onto the filter surface, which remove impurities from and out of the filter surface.
- this can also be rotatably attached to the piston rod 14, as indicated by an arrow 21.
- the spray head 19 can also be designed with a small distance of its periphery to the inside of the hollow filter 7, so that in addition to the effect of the rinsing jets 20 of the first embodiment of FIG. 1 explained Bernoulli effect can be exploited. Otherwise, the self-cleaning mode of the hollow filter 7 according to Embodiment 2 proceeds in the two phases according to the embodiment of FIG. 1.
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Abstract
Description
Plattenwärmetauscher Plate heat exchanger
Die vorliegende Erfindung betrifft einen Plattenwärmetauscher gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a plate heat exchanger according to the preamble of claim 1.
Bei Plattenwärmetauschern bilden eine Anzahl von profilgeprägten dünnen Platten mit Durchlassöffnungen aneinander gereiht ein Paket von Fließspalten, die wechselseitig von den wärmetauschenden Medien durchflössen werden. Zwischen die Platten eingelegte Umfangsdichtungen gewährleisten, dass die gewünschte Durchströmung des Pakets erreicht wird, und dass dieses nach außen dicht ist. Dabei sollen Plattenwärmetauscher bei kompakter Bauweise eine große Wärmetauschfläche bei möglichst gerin- gern Druckverlusten zur Verfügung stellen.In plate heat exchangers, a number of profile-embossed thin plates with passage openings lined up form a package of flow gaps that are alternately flowed through by the heat exchanging media. Circumferential seals inserted between the plates ensure that the desired flow through the package is achieved and that it is sealed to the outside. Plate heat exchangers with a compact design should provide a large heat exchange surface with the lowest possible pressure losses.
Häufig ist es erforderlich, dass zumindest eines der Wärmetauschmedien, z.B. Kühlwasser, gereinigt werden muss, bevor es in die engen Fliesspalten zwischen den Wärmetauscherplatten eintritt. Dazu ist es be- kannt, den Plattenwärmetauschern separate Filter vorzuschalten, was die kompakte Bauweise der Plattenwärmetauscher konterkariert, da die separaten Filter einen erhöhten Platzbedarf benötigen, was insbesondere unter beengten Raumverhältnissen kritisch ist und auch zu erhöhten Kosten führt.Often it is necessary that at least one of the heat exchange media, e.g. Cooling water, must be cleaned before it enters the narrow flow gaps between the heat exchanger plates. For this purpose, it is known to precede the plate heat exchangers separate filter, which counteracts the compact design of the plate heat exchanger, since the separate filter require more space, which is particularly critical in confined spaces and also leads to increased costs.
Als separate Filter kommen z.B. Automatikfilter F 450 der Firma Schü- nemann GmbH, Bremen zum Einsatz. Dabei handelt es sich um selbstreinigende und im Wesentlichen wartungsfreie Filter. Diese besitzen ein zylindrisches Gehäuse mit einem darin koaxial angeordneten Filterkorb. Die zu reinigende Flüssigkeit wird über einen Einlassstutzen dem Innenraum des FiI- terkorbs zugeführt. Das zu reinigende Medium durchströmt den Filterkorb von innen nach außen und wird in gereinigter Form über einen radialen Aus- lassstutzen aus dem Filtergehäuse abgeführt. Der Filterkorb setzt sich im Betrieb von hinten nach vorn immer mehr zu, so dass die Strömungsgeschwindigkeit des Mediums im Siebkorb nach und nach geringer wird. Das hat nach Bernoulli zur Folge, dass der Druck im Siebkorb ansteigt. Nach dem Erreichen eines gewissen Differenzdruckes zwischen dem Siebkorbinnen- raum und dem den Siebkorb umgebenen Raum löst ein Differenzdruckschalter eine Selbstreinigung des Filters aus. Diese verläuft in zwei Phasen. Zunächst wird ein Spülventil geöffnet, welches in einer Spülleitung angeordnet ist, die von einer Spülkammer abgeht. Diese ist an dem dem Eingang des Filters abgewandten Ende angeordnet und mit dem Innenraum des Siebkorbes hydraulisch verbunden. Durch Öffnen des Spülventils erfolgt eine Öffnung gegenüber dem Atmosphärendruck, wodurch ein Spülstrom durch den Innenraum des Filterkorbes ausgelöst wird. Aufgrund dieses Spülstroms lösen sich grobe Partikel von der Innenfläche des Siebkorbs ab und verlassen den Filter über die Abflussleitung.Separate filters are, for example, automatic filters F 450 from Schüemann GmbH, Bremen. These are self-cleaning and essentially maintenance-free filters. These have a cylindrical housing with a filter basket arranged coaxially therein. The liquid to be cleaned is fed via an inlet pipe to the interior of the filter basket. The medium to be cleaned flows through the filter basket from the inside to the outside and is removed in purified form via a radial outlet. Laßstutzen removed from the filter housing. The filter basket settles more and more during operation from back to front, so that the flow velocity of the medium in the strainer basket gradually decreases. According to Bernoulli, this means that the pressure in the screen basket rises. After reaching a certain differential pressure between the screen basket interior and the space surrounding the screen basket, a differential pressure switch triggers a self-cleaning of the filter. This runs in two phases. First, a purge valve is opened, which is arranged in a purge line, which leaves from a rinsing chamber. This is arranged at the end remote from the inlet of the filter and hydraulically connected to the interior of the screen basket. By opening the purge valve, an opening is made with respect to the atmospheric pressure, whereby a purge flow through the interior of the filter basket is triggered. As a result of this purge flow, coarse particles separate from the inner surface of the strainer basket and leave the filter via the drainage line.
In Phase 2 der Selbstreinigung des Filters werden auch die in der perforierten Filterfläche des Filters festsitzenden Ablagerungen ausgespült. In dieser Phase der Selbstreinigung wird ebenfalls das Bemoulli-Prinzip ausge- nutzt. Dazu wird aus dem Spülkasten eine Spülscheibe in den Filterkorb eingeführt, die auf einer Kolbenstange sitzt, welche pneumatisch angetrieben wird. Zwischen der Peripherie dieser Spülscheibe und der Innenseite des Filterkorbs besteht nur ein geringer Spalt, wodurch die Strömungsgeschwindigkeit des zu filternden Mediums in diesem Bereich stark erhöht wird. Dar- aus resultiert ein Druckabfall im Innenraum des Filterkorbs an dieser Stelle und damit eine Strömungsumkehr von der Außenseite des Filterkorbs in dessen Innenraum. Dadurch werden die Ablagerungen aus den Perforationen des Filterkorbs entfernt und über die Spülleitung abgeführt. Nach dem der Siebkorb abgereinigt ist, wird das Spülventil geschlossen und die Spülschei- be nimmt durch Zurückfahren der Kolbenstange wieder eine Position im Spülkasten ein. Die oben kurz beschriebenen automatischen Rückspülfilter der Firma Georg Schünemann GmbH haben neben dem Selbstreinigungseffekt u.a. folgende Vorteile: Fortsetzung der Filtration während der Selbstreinigung, geringer Druckabfall, Filterfeinheiten von ca. 0,1 bis 10 mm, geringe Spülmengen und Medienverluste, Einbaulage beliebig variierbar.In phase 2 of the self-cleaning of the filter, the deposits stuck in the perforated filter surface of the filter are also rinsed out. In this phase of self-cleaning, the Bemoulli principle is also exploited. For this purpose, a flushing disk is inserted from the cistern into the filter basket, which sits on a piston rod, which is pneumatically driven. Between the periphery of this washer and the inside of the filter basket, there is only a small gap, whereby the flow rate of the medium to be filtered is greatly increased in this area. This results in a pressure drop in the interior of the filter basket at this point and thus a flow reversal from the outside of the filter basket in its interior. As a result, the deposits are removed from the perforations of the filter basket and discharged through the purge line. After the strainer basket has been cleaned, the flushing valve is closed and the flushing disk returns to a position in the cistern by retracting the piston rod. The automatic backflushing filters of the company Georg Schünemann GmbH briefly described above have the following advantages in addition to the self-cleaning effect: Continuation of filtration during self-cleaning, low pressure drop, filter fineness of approx. 0.1 to 10 mm, low flushing volumes and media losses, installation position freely variable.
Neben Plattenwärmetauschern mit separaten Filtern sind aber auch schon Plattenwärmetauscher mit integrierten Filtern bekannt. Derartige gat- tungsgemäße Plattenwärmetauscher sind beispielsweise in GB-A 1 207 919 und WO 02/052 215 A1 offenbart.In addition to plate heat exchangers with separate filters but also plate heat exchangers with integrated filters are known. Such plate heat exchangers according to the invention are disclosed, for example, in GB-A 1 207 919 and WO 02/052 215 A1.
Bei dem in der GB-A 1 207 919 beschriebenen Plattenwärmetauscher ist ein zylindrischer Hohlfilter in einen Einlasskanal des Wärmetauschers ein- geschoben, der mittels Abstandshaltern zentriert, d.h. konzentrisch im Einlasskanal angeordnet ist. Der dadurch zwischen der Außenseite des Filters und der lichten Weite des Einlasskanals gebildete Ringspalt ist dabei in seiner radialen Weite so gewählt, dass diese nicht größer als die Maschen- oder Lochweite des Filters ist. Damit sollen bei einwandfreier Ausfilterung der Feststoffe Strömungstoträume im Einlasskanal vermieden werden. In einer Ausführungsform der in GB-A 1 207 919 offenbarten Erfindung ist der Einlasskanal, in dem der Filter angeordnet ist, durch einen Rohrstutzen über das Ende des Plattenstapels hinaus verlängert. Der Filter ragt in diesen Rohrstutzen, der durch einen Blindflansch verschlossen ist, hinein. Nach dem Lösen des Blindflansches kann der Filter aus dem Einlasskanal zur Reinigung herausgezogen werden. In den Rohrstutzen ist eine Spülleitung eingebunden, die in eine der Abflussleitungen des Plattenwärmetauschers mündet. Über die Spülleitung strömt ständig ein kleiner Bypassstrom des Wärme- tauschfluids, dessen Größe durch ein in die Spülleitung eingebundenes Ven- til einstellbar sein kann. Der Bypassstrom soll bewirken, dass sich im Filter abgesetzte Feststoffe lösen und in dem Bereich des Filters sammeln, der in den Rohrstutzen hineinragt. Abgesehen davon, dass die sich im Rohrstutzen sammelnden Ablagerungen den Beipassstrom langsam zum Versiegen bringen, reicht dieser ohnehin nur aus, um sehr grobe Partikel vom Filter abzulösen. Insbesondere bei größerer Filterfeinheit setzt sich der Filter bei dieser Lösung schnell zu, so dass der Filter in Abhängigkeit von dem Verschmutzungsgrad des einströmenden Wärmetauschmediums von Zeit zu Zeit gereinigt werden muss. Dazu ist der Filter aus dem Plattenwärmetauscher auszubauen. Abgesehen von den Aufwendungen für das Öffnen des Plattenwärmetauschers und das Reinigen des Filters wird dadurch der Prozess unter- brachen.In the plate heat exchanger described in GB-A 1 207 919, a cylindrical hollow filter is inserted into an inlet channel of the heat exchanger, which is centered by means of spacers, ie arranged concentrically in the inlet channel. The annular gap formed thereby between the outside of the filter and the clear width of the inlet channel is chosen in its radial width so that it is not greater than the mesh or hole width of the filter. This should be avoided with perfect filtering of solids flow debris in the inlet channel. In one embodiment of the invention disclosed in GB-A-1 207 919, the inlet channel in which the filter is disposed is extended beyond the end of the plate stack by a pipe stub. The filter protrudes into this pipe socket, which is closed by a blind flange. After loosening the blind flange, the filter can be pulled out of the inlet channel for cleaning. In the pipe socket a flushing line is integrated, which opens into one of the drain pipes of the plate heat exchanger. A small bypass flow of the heat exchange fluid constantly flows through the purge line, the size of which can be adjustable by means of a valve incorporated into the purge line. The bypass flow is intended to cause solids settled in the filter to dissolve and collect in the area of the filter which is in protrudes the pipe socket. Apart from the fact that the accumulating in the pipe socket deposits bring the bypass flow slowly to dry, this is enough anyway only to remove very coarse particles from the filter. Especially with larger filter fineness, the filter sets fast in this solution, so that the filter must be cleaned from time to time depending on the degree of contamination of the incoming heat exchange medium. To do this, remove the filter from the plate heat exchanger. Apart from the expenses for opening the plate heat exchanger and cleaning the filter, the process is interrupted.
Der in der WO 02/052 215 A1 offenbarte Plattenwärmetauscher mit integriertem Filter weist die gleichen Nachteile auf.The plate heat exchanger with integrated filter disclosed in WO 02/052 215 A1 has the same disadvantages.
Aufgabe der vorliegenden Erfindung ist es daher, einen Plattenwärmetauscher gattungsgemäßer Art zur Verfügung zu stellen, der auch bei großer Filterfeinheit eine Reinigung des Filters ohne Unterbrechung des Wärmetauschprozesses ermöglicht.Object of the present invention is therefore to provide a plate heat exchanger of the generic type available that allows cleaning of the filter without interrupting the heat exchange process, even at high filtration fineness.
Diese Aufgabe wird erfindungsgemäß mit einem Plattenwärmetauscher gelöst, der die Merkmale des Anspruchs 1 aufweist.This object is achieved with a plate heat exchanger having the features of claim 1.
Der Filtereinsatz eines erfindungsgemäßen Plattenwärmetauschers ist also selbstreinigend, in dem eine Reinigungsvorrichtung in bestimmten Zei- tintervallen den Innenraum des Hohlfilters zumindest teilweise abfährt und die Ablagerungen am und aus dem Hohlfilter entfernt. Zur Auslösung des Selbstreinigungsmodus des Hohlfilters sind in vorteilhafter Ausgestaltung Mittel zur Differenzdrucküberwachung bzw. zur Zeitintervallsteuerung vorgesehen. Zur Differenzdrucküberwachung sind am Eingang des Hohlfilters und zwar auf dessen Innenseite und Außenseite Drucksensoren angeordnet, die bei einem entsprechenden Differenzdruck den Selbstreinigungsmodus ein- leiten. Anstelle oder zusätzlich zur Differenzdrucküberwachung kann auch eine Zeitintervallsteuerung vorgesehen sein. Werden beide Steuerungsarten verwendet, so ist es zweckmäßig, wenn die Differenzdrucküberwachung Vorrang vor der Zeitintervallschaltung hat.The filter insert of a plate heat exchanger according to the invention is thus self-cleaning, in which a cleaning device at certain time intervals, the interior of the hollow filter at least partially leaves and removes the deposits on and out of the hollow filter. To trigger the self-cleaning mode of the hollow filter means for differential pressure monitoring or for time interval control are provided in an advantageous embodiment. For differential pressure monitoring, pressure sensors are arranged at the inlet of the hollow filter, specifically on its inside and outside, which, with a corresponding differential pressure, activate the self-cleaning mode. conduct. Instead of or in addition to the differential pressure monitoring, a time interval control can also be provided. If both types of control are used, then it is expedient if the differential pressure monitoring has priority over the time interval circuit.
In vorteilhafter Ausgestaltung der Erfindung besteht die Reinigungsvorrichtung aus einem Spülkopf, der auf einer axial im Hohlfilter verschiebbaren Kolbenstange sitzt, sowie aus einer Spülarmatur, deren Öffnen eine Spülströmung im Hohlfilter erzeugt.In an advantageous embodiment of the invention, the cleaning device consists of a flushing head, which sits on an axially displaceable in the hollow filter piston rod, as well as from a flushing valve, the opening of which generates a flushing flow in the hollow filter.
In einer Ausführungsform der Erfindung ist der Spülkopf als Scheibe ausgebildet, die nach dem Bernoulli-Prinzip eine Geschwindigkeitserhöhung des den Hohlfilter durchströmenden Wärmetauschmediums zwischen ihrer Peripherie und der Innenseite des Hohlfilters und damit einen örtlichen Druckabfall im Hohlfilter hervorruft. Diese Arbeitsweise entspricht der des eingangs kurz beschriebenen selbstreinigenden Automatikfilters F 450 der Firma Georg Schünemann GmbH.In one embodiment of the invention, the flushing head is designed as a disc which, according to the Bernoulli principle, causes an increase in the speed of the heat exchange medium flowing through the hollow filter between its periphery and the inside of the hollow filter and thus a local pressure drop in the hollow filter. This mode of operation corresponds to that of the initially described self-cleaning automatic filter F 450 from Georg Schünemann GmbH.
In einer weiteren Ausführungsform der Erfindung kann der Spülkopf als Sprühkopf ausgeführt sein, über den Sprühstrahlen auf die Innenseite des Hohlfilters gerichtet werden können. Dabei ist es zweckmäßig, wenn der Spülkopf neben seiner axialen Beweglichkeit auch eine Drehbeweglichkeit um die Kolbenstange aufweist. Der Sprühkopf kann auch so ausgelegt sein, dass mit ihm zusätzlich auch das oben beschriebene Bernoulli-Prinzip ver- wirklicht werden kann.In a further embodiment of the invention, the flushing head can be designed as a spray head, can be directed by the spray jets on the inside of the hollow filter. It is expedient if the flushing head in addition to its axial mobility also has a rotational movement about the piston rod. The spray head can also be designed so that it can also be used to implement the Bernoulli principle described above.
Der Selbstreinigungsmodus des Hohlfilters gestattet es, diesen mit einer großen Filterfeinheit von z.B. 0,1 mm auszustatten, so dass auch relativ feine Partikel aus dem Wärmetauschmedium ausgefiltert werden können, was die Standzeit des Plattenwärmetauschers erhöht. Die Erfindung wird nachstehend anhand von Ausführungsbeispielen näher erläutert. In der dazugehörigen Zeichnung zeigt in rein schematischer Weise:The self-cleaning mode of the hollow filter allows it to be equipped with a large filter fineness of, for example, 0.1 mm, so that even relatively fine particles can be filtered out of the heat exchange medium, which increases the service life of the plate heat exchanger. The invention will be explained in more detail below with reference to embodiments. In the accompanying drawing shows in a purely schematic way:
Fig. 1 einen Querschnitt durch den unteren Bereich eines Plattenwärmetauschers mit einem selbstreinigenden Filtereinsatz nach einem ersten Ausführungsbeispiel der Erfindung, und1 shows a cross section through the lower portion of a plate heat exchanger with a self-cleaning filter cartridge according to a first embodiment of the invention, and
Fig. 2 einen Querschnitt durch den unteren Bereich eines Platten- Wärmetauschers mit einem selbstreinigenden Filtereinsatz nach einer zweiten Ausführungsform der Erfindung.Fig. 2 shows a cross section through the lower portion of a plate heat exchanger with a self-cleaning filter cartridge according to a second embodiment of the invention.
Der in der Zeichnung gezeigte Plattenwärmetauscher 1 besitzt Wärmetauscherplatten 2, die in ein nicht dargestelltes Gestell eingehängt sind und mittels ebenfalls nicht dargestellter Spannschrauben zwischen zwei Spannplatten 3 und 4 verspannt werden, so dass die Wärmetauscherplatten 2 in einem Paket dicht aneinander liegen.The plate heat exchanger 1 shown in the drawing has heat exchanger plates 2, which are mounted in a frame, not shown, and are clamped by means also not shown clamping screws between two clamping plates 3 and 4, so that the heat exchanger plates 2 are in a package close together.
Jede Wärmetauscherplatte 2 weist vier aus der Darstellung nicht er- sichtliche Ein- bzw. Austrittsöffnung auf und ist in dem Bereich zwischen diesen Öffnungen profiliert. Mit dieser Profilierung stützen sich die Wärmetauscherplatten 2 aneinander ab. Des Weiteren sorgt diese Profilierung für eine Vergrößerung der Wärmeaustauschfläche und für die Erzeugung von dem Wärmeübergang förderlichen Turbulenzen der Strömung zwischen den Wärmetauscherplatten 2 sowie für eine bessere Verteilung der wärmetauschenden Medien über die Fläche der Wärmetauscherplatten 2. Zwischen den Wärmetauscherplatten 2 eingelegte Umfangsdichtungen sorgen zum einen dafür, dass die wärmetauschenden Medien nicht nach außen dringen können, insbesondere aber auch dafür, dass die Medien separiert voneinan- der jeweils jedes zweite Wärmetauscherplattenpaar durchströmen. Der Zu- bzw. Abfluss der wärmetauschenden Medien erfolgt über Rohrstutzen 5, von denen aus der Zeichnung aufgrund der Darstellung nur ein Rohrstutzen 5 ersichtlich ist. Die Rohrstutzen 5 fluchten mit den Aus- und Eintrittsöffnungen der Wärmetauscherplatten 2, die bei zu einem Paket zusammengepressten Wärmetauscherplatten 2 Ein- und Auslasskanäle 6 für die Wärmetauschme- dien bilden.Each heat exchanger plate 2 has four inlet and outlet openings, which are not shown in the illustration, and is profiled in the area between these openings. With this profiling, the heat exchanger plates 2 are supported against each other. Furthermore, this profiling ensures an enlargement of the heat exchange surface and for the generation of the heat transfer conducive turbulence of the flow between the heat exchanger plates 2 and for a better distribution of heat exchanging media over the surface of the heat exchanger plates 2. Between the heat exchanger plates 2 inserted circumferential seals provide for a in that the heat-exchanging media can not escape to the outside, but in particular also ensure that the media flows through each other every two pairs of heat exchanger plates separated from one another. The inflow and outflow of heat exchanging media via pipe socket 5, from which from the drawing due to the illustration only a pipe socket 5 can be seen. The pipe sockets 5 are aligned with the outlets and inlets of the heat exchanger plates 2, which form inlet and outlet channels 6 for the heat exchanger media in heat exchanger plates 2 pressed together into a package.
Die oben stehend, kurz erläuterte Konstruktion eines Plattenwärmetauschers 1 ist allgemein bekannt und bedarf daher keiner weiteren Erläuterungen.The above, briefly explained construction of a plate heat exchanger 1 is well known and therefore needs no further explanation.
Neu an dem in Fig. 1 dargestellten Plattenwärmetauscher 1 ist ein in den Einlasskanal 6 eines der Wärmetauschmedien eingelassener Hohlfilter 7, der in Abpassung an die kreisrunden Ein- bzw. Austrittsöffnungen der Wärmetauscherplatten 2 einen kreisförmigen Querschnitt besitzt und sich über die gesamte Länge des Pakets aus Wärmetauscherplatten 2 erstreckt. Das einlaufseitige Ende des Hohlfilters 7 ist in den Einlaufstutzen 5 und das auslaufseitige Ende in einen Spülkasten 8 eingebunden, und zwar derart, dass ein in Richtung des Pfeils 9 in den Plattenwärmetauscher 1 einströmende Wärmetauschmedium nicht unter Umgehung des Hohlfilters 7 in die zwischen den Wärmetauscherplatten 2 gebildeten Fließspalte 10 eintreten kann. Die Wärmetauscherplatten 2 sind durch die eingelegten Dichtungen so „geschaltet", dass das durch den Hohlfilter 7 gefilterte Wärmetauschmedium nur in jeden zweiten, zwischen den Wärmetauscherplatten 2 gebildeten Fließspalt 10 eintreten kann, wie durch die Pfeile 11 angedeutet ist. In die dazwischen liegenden Fließspalte 10 der Wärmetauscherplatten 2 tritt von oben im Gegenstrom ein anderes Wärmetauschmedium ein, welches nach dem Durchströmen der Fließspalte 10 in einen aus der Darstellung nicht ersichtlichen Auslasskanal einströmt und durch diesen den Plattenwärmetauscher 1 verlässt. Am Eingang des Hohlfüters 7 sind in dessem Innenraum und im Außenraum zwei Drucksensoren 12 angeordnet, über die der Differenzdruck zwischen diesen beiden Messpunkten ermittelt wird. Nach Erreichen eines vorgegebenen Differenzdruckes wird über eine Steuerung ein Selbstreini- gungsmodus des Hohlfilters 7 eingeleitet. Dazu ist eine Reinigungsvorrichtung vorgesehen. Diese besteht aus einer Spülscheibe 13, die am Ende einer Kolbenstange 14 angeordnet ist, welche über einen Pneumatik- oder Hydraulikzylinder 15 axial in den Hohlfilter 7 ein- und ausfahrbar ist, wie durch einen Pfeil 16 angedeutet. Weiterhin gehört zur Reinigungsvorrichtung eine Spülleitung 17, die an den Spülkasten 8 angeflanscht ist, und ein Spülventil 18 aufweist.New to the plate heat exchanger 1 shown in Fig. 1 is a recessed into the inlet channel 6 of the heat exchange media hollow filter 7, which has a circular cross-section in adaptation to the circular inlet and outlet openings of the heat exchanger plates 2 and over the entire length of the package Heat exchanger plates 2 extends. The inlet end of the hollow filter 7 is incorporated into the inlet nozzle 5 and the outlet end in a cistern 8, in such a way that a flowing in the direction of arrow 9 in the plate heat exchanger 1 heat exchange medium not bypassing the hollow filter 7 in between the heat exchanger plates. 2 formed flow column 10 can occur. The heat exchanger plates 2 are "switched" by the inserted seals so that the heat exchange medium filtered through the hollow filter 7 can enter only every second flow gap 10 formed between the heat exchanger plates 2, as indicated by the arrows 11. In the intermediate flow gaps 10 the heat exchanger plates 2 enters from the top in countercurrent another heat exchange medium, which flows after flowing through the flow column 10 in a not apparent from the illustration outlet channel and leaves through this the plate heat exchanger 1. At the entrance of the hollow fan 7, two pressure sensors 12 are arranged in its interior and in the outer space, via which the differential pressure between these two measuring points is determined. After reaching a predetermined differential pressure, a self-cleaning mode of the hollow filter 7 is initiated via a controller. For this purpose, a cleaning device is provided. This consists of a rinsing disc 13, which is arranged at the end of a piston rod 14, which is axially via a pneumatic or hydraulic cylinder 15 in the hollow filter 7 and extendable, as indicated by an arrow 16. Furthermore, the cleaning device includes a purge line 17, which is flanged to the cistern 8, and has a purge valve 18.
Bei Auslösung des Selbstreinigungsmodus wird zunächst das Spülventil 18 geöffnet, wodurch eine geringe Spülströmung durch den Hohlfilter 7 ein- setzt. In dieser Phase des Selbstreinigungsmodus ist die Kolbenstange 14 vollständig eingefahren, so dass sich die Spülscheibe 13 im Spülkasten 8 befindet. Aufgrund der Spülströmung werden grobe Partikel, die sich auf der Filteroberfläche abgesetzt haben, von dieser abgehoben und in den Spülkasten 8 überführt, den sie über die Spülleitung 17 verlassen. Feine Partikel, die sich in der Perforation des Hohlfilters 7 festgesetzt haben, können durch diesen Spülvorgang nicht entfernt werden. Daher wird eine zweite Phase des Selbstreinigungsmodus eingeleitet. Dazu wird die Kolbenstange 14 und damit auch die Spülscheibe 13 in den Hohlfilter 7 eingefahren, wie in Fig. 1 dargestellt ist. Zwischen der Peripherie der Spülscheibe 13 und der Innen- seite des Hohlfilters 7 besteht ein kleiner Ringspalt, in dem durch die Verringerung des Strömungsquerschnittes eine erhöhte Strömungsgeschwindigkeit herrscht. Diese bewirkt einen starken Abfall des statischen Drucks im Innenraum des Hohlfilters 7 der geringer ist als der statische Druck in den Fließspalten 10 zwischen den Wärmeübertragungsplatten 2. Das führt im Bereich der Spülscheibe 13 zu einer Strömungsumkehr, so dass die in der Perforation des Hohlfilters 7 festsitzenden Partikel gelöst und in den Innenraum des Hohlfilters 7 gesaugt werden, den sie dann über die Spülleitung 17 verlassen. Der Kolben 14 und damit die Spülscheibe 13 kann gegebenenfalls mehrfach im Hohlfilter 7 hin und her bewegt werden, bis der gewünschte Reinigungseffekt erreicht ist. Während des Selbstreinigungsmodus des Hohl- filters 7 wird der Wärmeaustauschprozess im Plattenwärmetauscher 1 nicht unterbrochen.When the self-cleaning mode is triggered, first the flushing valve 18 is opened, whereby a small flushing flow through the hollow filter 7 sets in. In this phase of the self-cleaning mode, the piston rod 14 is fully retracted, so that the flushing disk 13 is in the cistern 8. Due to the scavenging flow coarse particles that have settled on the filter surface, lifted from this and transferred into the cistern 8, which they leave via the purge line 17. Fine particles that have settled in the perforation of the hollow filter 7 can not be removed by this flushing process. Therefore, a second phase of the self-cleaning mode is initiated. For this purpose, the piston rod 14 and thus also the rinsing disk 13 are retracted into the hollow filter 7, as shown in Fig. 1. Between the periphery of the rinsing disk 13 and the inner side of the hollow filter 7 there is a small annular gap, in which an increased flow velocity prevails due to the reduction of the flow cross section. This causes a strong drop in the static pressure in the interior of the hollow filter 7 which is less than the static pressure in the flow gaps 10 between the heat transfer plates 2. This leads in the region of the washer 13 to a flow reversal, so that stuck in the perforation of the hollow filter 7 Particles dissolved and in the interior of the Hollow filter 7 are sucked, which they then leave the purge line 17. The piston 14 and thus the rinsing disc 13 can optionally be repeatedly moved in the hollow filter 7 back and forth until the desired cleaning effect is achieved. During the self-cleaning mode of the hollow filter 7, the heat exchange process in the plate heat exchanger 1 is not interrupted.
Bei Beendigung des Selbstreinigungsmodus des Hohlfilters 7 fährt die Kolbenstange 14 die Spülscheibe 13 in den Spülkasten 8 zurück und das Spülventil 18 wird geschlossen.Upon completion of the self-cleaning mode of the hollow filter 7, the piston rod 14 moves the flushing disk 13 back into the cistern 8 and the flushing valve 18 is closed.
Das Ausführungsbeispiel gemäß Fig. 2 unterscheidet sich von dem gemäß Fig. 1 dadurch, dass bei der Reinigungsvorrichtung anstelle der Spülscheibe 13 ein Sprühkopf 19 Anwendung findet. Dieser besitzt Sprühdüsen, über die Reinigungsstrahlen 20 auf die Filteroberfläche gerichtet werden können, die Verunreinigungen von und aus der Filteroberfläche entfernen. Neben der axialen Beweglichkeit des Sprühkopfes 19 kann dieser auch drehbar an der Kolbenstange 14 befestigt sein, wie durch einen Pfeil 21 angedeutet ist. Der Sprühkopf 19 kann ebenfalls mit einem geringen Abstand seiner Peripherie zur Innenseite des Hohlfilters 7 ausgeführt werden, so dass zusätzlich zu der Wirkung der Spülstrahlen 20 der zum ersten Ausführungsbeispiel gemäß Fig. 1 erläuterte Bernoulli-Effekt ausgenutzt werden kann. Ansonsten verläuft der Selbstreinigungsmodus des Hohlfilters 7 gemäß dem Ausführungsbeispiel 2 in den zwei Phasen gemäß dem Ausführungsbeispiel zu Fig. 1. The embodiment according to FIG. 2 differs from that according to FIG. 1 in that, instead of the rinsing disk 13, a spray head 19 is used in the cleaning device. This has spray nozzles, over which cleaning jets 20 can be directed onto the filter surface, which remove impurities from and out of the filter surface. In addition to the axial mobility of the spray head 19, this can also be rotatably attached to the piston rod 14, as indicated by an arrow 21. The spray head 19 can also be designed with a small distance of its periphery to the inside of the hollow filter 7, so that in addition to the effect of the rinsing jets 20 of the first embodiment of FIG. 1 explained Bernoulli effect can be exploited. Otherwise, the self-cleaning mode of the hollow filter 7 according to Embodiment 2 proceeds in the two phases according to the embodiment of FIG. 1.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200610038720 DE102006038720A1 (en) | 2006-08-18 | 2006-08-18 | Plate heat exchanger |
| DE102006038720.1 | 2006-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008019659A1 true WO2008019659A1 (en) | 2008-02-21 |
Family
ID=38799411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2007/001423 Ceased WO2008019659A1 (en) | 2006-08-18 | 2007-08-07 | Plate heat exchanger |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102006038720A1 (en) |
| WO (1) | WO2008019659A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021019494A1 (en) * | 2019-08-01 | 2021-02-04 | Zvi Livni | Self cleaning filtering apparatus for plate heat exchangers |
| CN113943385A (en) * | 2021-11-19 | 2022-01-18 | 大冶海通热工技术有限公司 | PVB production process based on plate heat exchanger cooling |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009018901A1 (en) * | 2009-04-28 | 2010-11-04 | Deutz Ag | Restraint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3690373A (en) * | 1968-10-29 | 1972-09-12 | Apv Co Ltd | Plate heat exchangers |
| DE2613835A1 (en) * | 1975-04-01 | 1976-10-14 | Tokyo Shibaura Electric Co | Heat exchanger employing cooling water esp sea water - eg for use in coastal power stations etc |
| US20030234097A1 (en) * | 2002-06-21 | 2003-12-25 | Ford Global Technologies, Inc. | Transmission oil cooler and filter |
| WO2005098341A1 (en) * | 2004-04-05 | 2005-10-20 | Heco Filtration A/S | A method and filter unit for filtering in heat exchangers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2676803A1 (en) * | 1991-05-24 | 1992-11-27 | Electricite De France | DEVICE FOR PROTECTION AGAINST BLOCKING OF PLATE HEAT EXCHANGERS. |
| DE29724418U1 (en) * | 1997-04-25 | 2001-04-19 | Prophyta Biologischer Pflanzenschutz GmbH, 23999 Malchow | Device for separating substances from suspensions |
| SE518058C2 (en) * | 2000-12-22 | 2002-08-20 | Alfa Laval Ab | Component for supporting a filter member in a port channel to a plate heat exchanger, device comprising a tubular filter member and said component, and plate heat exchanger comprising a tubular filter member and said component |
-
2006
- 2006-08-18 DE DE200610038720 patent/DE102006038720A1/en not_active Ceased
-
2007
- 2007-08-07 WO PCT/DE2007/001423 patent/WO2008019659A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3690373A (en) * | 1968-10-29 | 1972-09-12 | Apv Co Ltd | Plate heat exchangers |
| DE2613835A1 (en) * | 1975-04-01 | 1976-10-14 | Tokyo Shibaura Electric Co | Heat exchanger employing cooling water esp sea water - eg for use in coastal power stations etc |
| US20030234097A1 (en) * | 2002-06-21 | 2003-12-25 | Ford Global Technologies, Inc. | Transmission oil cooler and filter |
| WO2005098341A1 (en) * | 2004-04-05 | 2005-10-20 | Heco Filtration A/S | A method and filter unit for filtering in heat exchangers |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021019494A1 (en) * | 2019-08-01 | 2021-02-04 | Zvi Livni | Self cleaning filtering apparatus for plate heat exchangers |
| CN114127504A (en) * | 2019-08-01 | 2022-03-01 | 兹维埃·利文 | Self-cleaning filter device for plate heat exchanger |
| US20220268537A1 (en) * | 2019-08-01 | 2022-08-25 | Zvi Livni | Self cleaning filtering apparatus for plate heat exchangers |
| CN113943385A (en) * | 2021-11-19 | 2022-01-18 | 大冶海通热工技术有限公司 | PVB production process based on plate heat exchanger cooling |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006038720A1 (en) | 2008-02-21 |
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