DE102004041387A1 - Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short - Google Patents

Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short

Info

Publication number
DE102004041387A1
DE102004041387A1 DE102004041387A DE102004041387A DE102004041387A1 DE 102004041387 A1 DE102004041387 A1 DE 102004041387A1 DE 102004041387 A DE102004041387 A DE 102004041387A DE 102004041387 A DE102004041387 A DE 102004041387A DE 102004041387 A1 DE102004041387 A1 DE 102004041387A1
Authority
DE
Germany
Prior art keywords
differential pressure
dd
filter
pressure value
housing
Prior art date
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
Application number
DE102004041387A
Other languages
German (de)
Inventor
Helmut Dr. Kling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE102004041387A priority Critical patent/DE102004041387A1/en
Priority claimed from DE200420020781 external-priority patent/DE202004020781U1/en
Publication of DE102004041387A1 publication Critical patent/DE102004041387A1/en
Application status is Ceased legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136Forced ventilation, e.g. by fans
    • H05K7/20181Filters; Louvers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32Responding to malfunctions or emergencies
    • F24F11/39Monitoring filter performance

Abstract

The arrangement is placed in a housing having a filter at its air inlet for filtering dirt from the air cooling an electrical assembly. A cooling device forms an air stream in the housing. Pressure sensors (S1, S2) determine differential pressure values using the pressures that are found from downstream and upstream of the filter, respectively. The values are compared and a signal is displayed, if the values exceed or fall short. An independent claim is also included for a filter arrangement for a housing with an electrical assembly.

Description

  • The The invention relates to an arrangement for cooling arranged in a housing electrical assemblies, in particular for implementation in base stations a radio communication system.
  • In an electrically operated technical device leads the power loss of current-carrying components and assemblies to a heating of the Device. Since standard electrical components for technical devices only one limited permissible operating temperature range for example, up to 70 ° C These are provided by cooling devices cooled. These cooling devices For example, fans that are in the housing one of the electrical components and assemblies circulating or flowing through airflow build up and thus a discharge cause the generated power loss or heat.
  • at an operation of technical equipment outside closed rooms or in adverse circumstances inside closed rooms is next to a heat dissipation additionally a sufficient protection against environmental influences such as dirt particles and liquids provided. Here you have to Protection regulations complied with the specified IP classes in order to ensure a permanent function of the technical devices.
  • From the DE 19755944 It is known to provide in an air inlet of a housing a membrane filter for separating dirt particles and liquids at the surface of the membrane filter from inflowing cooling air. Compared to one example from the DE 19626778 known housing with an air / air heat exchanger, which ensures a complete separation of an internal cooling circuit of an external cooling circuit, by the use of the membrane filter in a simple manner sufficient protection of the electrical components for the above uses of the technical device with the appropriate protective provisions be achieved. At the same time, a temperature difference between the temperature of the ambient atmosphere and the temperature inside the housing required for the cooling is reduced.
  • One Such membrane filter is based for example on a lower the name Goretex, Sympatex etc. known for use in clothing Membrane. This membrane consists of a fine mesh or knitted fabric of fibers, which allows a very small pore size. As a material for this example PTFE (Polytetrafluoroethylene), also known by the name Teflon. The membrane is usually on a substrate such as polyamide or polypropylene realized to a certain stability and resistance to reach the membrane filter.
  • By the very small pore size of the membrane filter this is compared to conventional Sun. mentioned depth filters pollution-resistant, as for example Dirt particles up to a very small particle size already on the surface of the Membrane are deposited and therefore not in the knitted fabric of the membrane, and impermeable across from liquids for example, water droplets or dissolved Salt crystals. Despite this property, they attach themselves to the surface of the However, membrane filters degrade and form over time dirt particles a so-called filter cake, which for the membrane filter flowing through a cooling air additionally to be overcome resistance represents. The disadvantage of this filter cake in terms of a reduction in the cooling air flow rate due to the increased back pressure and a consequent increase the temperature in the interior of the housing impact. Upon reaching the limit temperature would have This, for example, the consequence that individual components or assemblies Self-defense mechanisms activate, which ultimately leads to a shutdown of the assemblies or even of the technical device. But also one about one longer Period existing thermal load of the modules below the limit temperature leads for a reduction of the average operating time (MTBF - Mean Time Before Failure) of the electrical components or assemblies.
  • Around such damage to prevent the assemblies or a total failure of the technical device, the filter used must be cleaned or replaced in good time become. The period in which a certain degree of blocking of the filter occurs but to a great extent from the quality the cooling air from. Thus, a critical blocking of the filter in rural Areas only after a much longer Period as for example in urban areas with high Exhaust emissions or near the sea occur with a high salt concentration.
  • For operators of mobile radio systems that set up base stations with such filters in very different environments for supplying radio to subscribers, no or only difficult to predict maintenance intervals for the filter is a high cost factor. Firstly, the comparatively expensive filters should not be replaced or cleaned, if these one more time This can be aggravated by the fact that the base stations are partially installed in hard-to-reach locations, but on the other hand, a failure of a base station and thus the loss of radio coverage of subscribers in a geographical area should be avoided in any case ,
  • Of the Invention has for its object to provide an arrangement for cooling, a protection against a failure or an uncontrolled shutdown ensures electrical assemblies in a housing. This task is due to the features of the arrangement for cooling and the filter assembly after the independent claims solved. Advantageous developments of the invention are the dependent claims remove.
  • The inventive arrangement for cooling one in a housing arranged electrical assembly has at least one in each case an air inlet of the housing arranged filter for at least one filtering of at least dirt particles from inflowing cooling air to Cool the electrical assembly and at least one cooling device for building up an air flow in the case and to lead out the filtered, due to a flow and / or flow around the Heated assembly cooling air from at least one air outlet the housing on. Characteristic is at least one device for determining a differential pressure value from a respective upstream and downstream of the Filters certain pressure of the ambient atmosphere, to compare the detected Differential pressure value with a predetermined differential pressure value, as well as for outputting a signal when it exceeds or falls below the provided predetermined differential pressure value.
  • Of the use according to the invention a device for determining a differential pressure value uses advantageous the fact that at an increase in the flow resistance due to a total or partial blockage of the filter, the cooling device, for example, a fan, one with increasing flow resistance increasing negative pressure in the housing generated. A differential pressure between the pressure of the ambient atmosphere and the Pressure inside the case thus provides a measure of the degree of blocking of the filter. Should compare the determined differential pressure value with a predetermined differential pressure value, for example a ma maximum differential pressure value, exceeding is detected so will a signal, such as an alarm signal from the device output.
  • To Embodiments of the invention, the output signal of a Control device supplied which is a shutdown of the electrical assembly, a change the operation of the cooling device and / or an output of an alarm signal to an associated monitoring device controls. Physically, the control device can be used both as a separate as well as one in the facility for determining the Differential pressure value integrated device be realized.
  • By a shutdown of the electrical components due to the signal the means for determining the differential pressure value, the Assembly advantageous from damage or destruction due overheating protected become. In the same way, the control of the cooling device, for example in the form of an increase in the Speed of the fan or connecting a further fan overheating in the housing advantageous prevent. The output of an alarm signal is particularly for the application in centrally monitored Systems advantageous. Thus, in the case of an introductory described Radio communication system from the affected base station an alarm signal, optionally together with further status or alarm signals, transmitted to a central operating and maintenance center become. Starting from this operation and maintenance center Maintenance personnel with the replacement or cleaning of the filter entrusted and if necessary the base station switched off or in limited in scope.
  • The Device for determining the differential pressure value exists a further embodiment of the invention of at least two pressure sensors, the outside and inside the case are arranged, and an evaluation, which from the of the pressure sensors determined absolute pressures of the ambient atmospheres a Differential pressure calculated.
  • When Pressure sensors can commercial pressure sensors, for example, the company Honeywell, type Precision Pressure Transducer PPT, which uses the measured pressure in a corresponding implement analog or digital signal.
  • In an alternative embodiment, the device for determining the differential pressure value may be designed as a differential pressure sensor. This consists according to the prior art, for example, two hermetically separated by a membrane measuring chambers, the deflection of the membrane is a measure of the size of the differential pressure. In differential pressure sensors can advantageously additionally a comparison of the determined differential pressure with predetermined Grenzwer and corresponding signals are output when these limit values are exceeded.
  • One Differential pressure sensor can be particularly advantageous directly in a the filter enclosing frame be integrated, each one of the two measuring chamber before and behind the filter determines the current absolute pressure of the ambient atmosphere.
  • According to one Another embodiment is in each case an averaged differential pressure value compared with the predetermined differential pressure value, wherein the averaging over a Number of measurements. Advantageously, this short-term fluctuations the pressure that occurs, for example due to gusts of wind can, balanced and thus the safety in determining the degree of blocking of the filter increases. As an alternative to an averaging, for example, in the same way Extreme values or statistics about measured differential pressures evaluated according to fixed algorithms.
  • The The invention further comprises a filter arrangement consisting of a Filter and a frame enclosing the filter, in or in addition to the frame a device described above for determining a differential pressure value is arranged. This filter arrangement is particularly suitable for a Use in housings of technical devices with electrical components. Such technical devices are For example, base stations of radio communication systems, traffic guidance devices, Supply devices or control cabinets for industrial control Machinery. In the same way, the arrangement according to the invention also for a use in smaller electrical devices, such as portable or stationary Home computers or in electrical measuring devices, suitable.
  • embodiments The invention will be explained in more detail with reference to the accompanying drawings.
  • there demonstrate
  • 1 a base station of a mobile radio system with the arrangement according to the invention for cooling electrical components in a side view,
  • 2 a base station of a mobile radio system with the arrangement according to the invention for cooling electrical components in an alternative embodiment,
  • 3 Components of a radio communication system, and
  • 4 a flow diagram of a method according to the invention.
  • A technical device, for example a base station BTS of a radio communication system or mobile radio system, according to 1 has one or more electrical assemblies BG. These can be, for example, so-called TRX modules (transceivers) as well as other modules for baseband signal processing and communication with other components of the system. Here is an example of the configuration of base stations of the type BS-41, BS-241 or NB-441 Siemens AG pointed. According to a known type, the assemblies BG consist for example of plug-in housings with electronic components and high-power circuits located therein. Subassemblies BG are understood within the scope of the invention, all electrical devices of a technical device. For example, printed circuit boards realized in a personal computer and peripherals such as hard disks can be counted for this purpose.
  • During the Operation of the base station BTS leads the power loss of the individual electrical assemblies BG too a warming, whereby the need for cooling arises to a maximum allowed Operating temperature of the assemblies BG or individual electrical Components not to exceed.
  • The in a side view or review shown housing G a Base station BTS or generally an electrical device has on an end face an air inlet LE with a arranged therein Membrane filter MB on. The dimensions of the air inlet LE are dimensioned such that through the membrane filter MB one for cooling the electrical assemblies sufficient amount of cooling air from the ambient atmosphere of the base station BTS in the case G, even with a partial addition of the membrane filter MB through Dirt particles or liquid, pour in can. To protect the membrane filter MB from mechanical damage as well direct exposure to splashing water Lamellae LAM are provided.
  • The membrane filter MB is designed as a surface filter, which has the particularly advantageous property of already depositing dirt particles and liquids of the ambient atmosphere on the surface of the membrane, whereby, for example, sensitive electronic components or circuits in the assemblies BG are protected against environmental influences. Such a membrane filter MB is based for example on an under the name Goretex, Sympatex etc. for use in clothing known membrane, but which is adapted to the specific requirements of an application in technical equipment, for example, in terms of pore size or fire resistance. The membrane of the filter consists of a fine mesh or knitted fabric of fibers. A very small pore size prevents penetration of the dirt particles and thus irreversible clogging of the membrane. Nevertheless, dirt particles can deposit on the surface of the membrane to form a filter cake. Likewise, liquids up to a specific pressure per unit area can not pass through the membrane. The material used for the membrane, for example, PTFE, also known under the name Teflon. The membrane is usually applied to a coarsely woven carrier material such as polyamide or polypropylene in order to achieve high stability and resistance of the membrane filter MB.
  • By a special design of the membrane filter MB can protect against IP policies are met until, for example, IP55, which makes a deployment of the technical device outside closed rooms or under adverse environmental conditions, such as in industrial production occurs. By a special Selection of the membrane filter material can also be an individual Adaptation to real environmental conditions, such as a Resistance to acids, respectively.
  • The However, embodiments described below are not on the use of membrane filters in the technical device or the Base station limited. Other known filters, such as conventional depth filters for filtering of exclusively Dirt particles, or filters made of hydrophobic material with one Membrane filter comparable properties for filtering dirt particles and liquids, are used in the same way in the inventive arrangement in the same way.
  • The in the 1 shown electrical assemblies BG are arranged one above the other in the housing. Through the membrane filter MB inflowing cooling air - represented by arrows - is guided in an inflow KE and an air guide LLE under the electrical components BG. The louver LLE, for example, an air baffle, thereby has the task to distribute the cooling air evenly over the base of the lowest electrical assembly BG, so it comes to a homogeneous flow through the entire assembly BG. The cooling air flows through the plug-in housings or assemblies BG provided with ventilation slots and dissipates heat from the electrical components and circuits.
  • The cooling the electrical components BG by means of a direct flow through the housing G with cooling air has the advantage of being required to approach zero Temperature difference between the temperature of the ambient atmosphere or the temperature of the incoming cooling air and the temperature inside the housing G, reducing the operation the electrical assemblies BG even at a temperature of the ambient atmosphere of, for example + 70 ° C, the the limit temperature of the components corresponds, reduced by the Degree of internal warming, is secured.
  • A cooling arrangement VE, which in the 1 is arranged, for example, above the uppermost assembly BG sucks in the flow of the assemblies BG heated cooling air and leads them via an outflow KA and provided on the back of the housing G air outlet LA to the ambient atmosphere. The air outlet LA is again protected by lamellas and optionally a - not shown - membrane filter from mechanical damage and ingress of spray water. As cooling devices VE, for example, one or more fans are used, the temperature-controlled generate a varying air flow.
  • to Control of the temperature inside the housing G is the speed of the Fan controlled by a control device ST. To capture Parameters for this regulation can for example in the area of the air inlet LE, the air outlet LA and at various locations within the housing G temperature sensor provided which are permanently the temperatures of the incoming cooling air and the atmosphere inside the case G or determine the temperature of special components, and which are evaluated by the control device ST. At this Regulation is governed by the speed of the fan of the cooling device VE is the flow rate of the cooling air in the case G varies, for example, a constant temperature inside of the housing G independently from the temperature of the ambient atmosphere.
  • A constant operating temperature of the assemblies BG, for example, has a positive effect on the service life of electrical components and high-performance circuits. In addition, an always kept low speed of the cooling device VE, under the condition that the limit temperature of the components is not exceeded, allows a minimization of the noise emission of the technical device. Furthermore, by the control at a cold start of the device initially from Be operation of the cooling device VE be omitted to allow the assemblies BG to heat quickly to the desired operating temperature and only after reaching this operating temperature to perform a further control of the cooling device VE to maintain the constant operating temperature.
  • at a certain restriction the cooling air flow rate through the membrane filter MB, for example due to the foregoing described themselves on the surface forming filter cake or deposits of dirt particles, promotes the cooling device For example, a larger amount Cooling air over the Air outlet LA from the housing G out as can flow through the air inlet LE in the housing G, to compensate for the partial blocking of the membrane filter MB and a constant cooling air flow sure. This creates a negative pressure in the housing G.
  • In the example of 1 is measured by two commercially available pressure sensors S1, S2, for example of the type Honeywell PPT, in each case an absolute pressure inside and outside of the housing G. For this purpose, the first pressure sensor s1 can be attached, for example, anywhere on the outside of the housing, but here too protection of the sensor against mechanical damage and other environmental influences, which can restrict the functioning of the sensor, makes sense. The second pressure sensor S2 is disposed within the housing G, for example, as shown near the back of the membrane filter MB. However, the second pressure sensor S2 can be arranged in the same way anywhere in the housing G, since there is usually a constant absolute pressure in the housing G.
  • The absolute pressures of the ambient atmospheres outside and inside the housing measured by the pressure sensors S1, S2 or the digital or analog signals derived from these pressure measurements in the sensors are compared with one another in an evaluation device AE in order to determine a differential pressure value. From a comparison of the determined differential pressure value with a predetermined limit value, when the limit value is exceeded, a signal is generated which is forwarded by the evaluation device AE to a central control device ST of the base station BTS. The underlying method is referring to 4 explained in detail below.
  • The Control device ST, which also includes other functionalities Base station BTS such as the function of the power amplifier, the power supply or otherwise supervised, in turn, due to the signal of the evaluation device AE Alarm signal to an operating unit assigned to the base station BTS and maintenance center OMC. Starting from the operations and maintenance center maintenance or replacement of the membrane filter MB is initiated and optionally functions of the base station BTS, for example switching off TRX modules to reduce the generated ones Warmth, adapted to the conditions. The signaling of the requirement the maintenance of the membrane filter has the advantage that on the one hand extends the maintenance intervals can be and on the other hand, the operating cost of the base station due a mode of operation kept in an optimum temperature range or the risk of the occurrence of interference can be reduced.
  • In addition to the described implementation with separately arranged sensors S1, S2 and evaluation AE, the functionality can also be realized in a single device. This is exemplary in 2 shown. In this alternative embodiment, a commercial differential pressure sensor DD is used. A differential pressure sensor usually consists of two hermetically separated by a membrane measuring chambers, the deflection of the membrane is a measure of the size of the differential pressure.
  • In the differential pressure sensor DD is carried out according to the previous one Description a comparison of the determined differential pressure with at least one predetermined limit and outputting corresponding ones Signals when exceeded this limit value to the control device ST.
  • After 2 the differential pressure sensor DD is integrated into a frame R enclosing the membrane filter MB, wherein one of the two measuring chambers can perform measurements upstream or downstream of the membrane filter MB with respect to the respective actual absolute pressure of the ambient atmosphere via an opening in the frame R.
  • The active surface of the membrane filter MB is in the example of 2 increased by a wrinkling and thereby takes laterally a larger volume. At the same time, however, the stability of the filter and the cooling air flow rate is increased. The arrangement of the membrane filter MB in a frame R allows rapid removal of the membrane filter cassette consisting of the membrane filter and the frame for maintenance and cleaning purposes or for replacement.
  • In the 3 are exemplary components of a known GSM (Global System for Mobile Communication) or UMTS mobile radio system (Universal Mobile Telecommunication System) shown. A mobile radio system consists of a number of switching centers MSC (Mobile Switching Center), which ensure a transition to public telecommunications networks PSTN (Public Switched Telephone Network) and packet data networks, such as the Internet. The switching devices MSC each have a plurality of base station systems BSS (Base Station System), consisting of base station controllers BSC (Base Station Controller) and base stations BTS (Base Transceiver Station), respectively. The base stations BTS a geographical area, also called radio cell Z, with radio resources. On the radio interface between the base stations BTS and user equipment UE (User Equipment) signals in uplink UL (uplink) and downlink DL (downlink) are transmitted.
  • The inventive arrangement is particularly advantageous in outside closed rooms set up Base stations BTS of such a mobile radio system used. Such base stations are also referred to as outdoor base stations.
  • With connected to a switching device MSC is still such called Operations and Maintenance Center OMC (Operation and Maintenance Center). In this run information about the status of the individual components of the system so that from a central point of the system monitors the functionality can be. To this operation and maintenance center would after the invention sent an alarm signal from the base station BTS if it were found that an exchange or a cleaning of the membrane filter MB in the base station BTS is required. As a result of this alarm could, for example, for maintenance the maintenance staff responsible for the filter to the base station be sent. As described above, can in the same way in response to the alarm signal, the functionality of the base station on the part of the Operations and Maintenance Center OMC, for example by switching off one or more modules, overheating to avoid the assemblies. Alternatively or additionally, the monitoring or control device leads in the base station automatically switching off modules, and informs the operator and maintenance center using known signaling accordingly.
  • In 4 Finally, a flowchart is shown, the individual steps in the device according to the invention, for example in a differential pressure sensor described above, are performed.
  • In In a first step, absolute pressures d1, d2 of the ambient atmosphere outside and inside the case upstream and downstream of the filter. The measurements take place, for example, periodically at certain intervals. From these measurements d1, d2 or these representing digital or analog Values, a pressure difference value dd is calculated in a second step. Alternatively to these two steps, according to the preceding described way also directly differential pressure readings in one Be taken up step.
  • Around short-term pressure fluctuations and thus possibly triggered false alarms to avoid, an evaluation of the determined differential pressure values carried out. Thus, in a third step, for example, over a number n of calculated Pressure difference values dd an averaging are made, from which the amount a mean pressure difference value mdd is determined. The averaging may be running, e.g. considering a respective number of last calculated values, so that with each measurement a new average is determined.
  • In a fourth step is a comparison of the average pressure difference value mdd with a limit value or a maximum differential pressure value ddmax performed. For example, the limit ddmax may depend on the configuration of the Base station and / or site, taking into account environmental conditions, dimensioned and stored in the device. Is in This comparison found that the averaged pressure difference value mdd greater than is the maximum pressure difference value ddmax, so is the pressure difference sensor DD or the control device ST of the base station in a fifth step an alarm signal al issued. Unless the comparison shows that the maximum pressure difference value ddmax from the averaged pressure difference value not exceeded In the following, further measurements, calculations and comparisons will be made performed according to the steps described.
  • alternative can do this in the same way extreme values of the differential pressures or in general statistics over the measured differential pressures according to defined algorithms with a given alarm criterion be compared. This can be done for example in such a way that the measured differential pressure values over a period of approx. one hour are evaluated, and an alarm signal only then output if all the differential pressure values determined in this period are do not exceed a limit.

Claims (8)

  1. Arrangement for cooling at least one in one casing (G) arranged electrical assembly (BG), with at least one in each case an air inlet (LE) of the housing (G) arranged filter (MB) for a filtering of at least dirt particles from incoming air for cooling the electrical assembly (BG), and at least one cooling device (VE) to build up an air flow in the case (G) and to lead out the filtered, due to a flow and / or flow around the assembly (BG) heated cooling air at least one air outlet (LA) of the housing (G), characterized by at least one device (S1, S2, DD) for determining a differential pressure value (dd, mdd) from one upstream and downstream of the Filters (MB) specific pressure of the ambient atmosphere, to Comparing the determined differential pressure value (dd, mdd) with a predetermined differential pressure value (ddmax), and for outputting a Signal (al) when exceeding or falling below the predetermined differential pressure value (ddmax).
  2. Arrangement according to claim 1, characterized that the filter (MB) is designed as a membrane filter, which Dirt particles and liquids on the surface the membrane separates.
  3. Arrangement according to claim 1 or 2, characterized that the at least one device for determining the differential pressure of at least two pressure sensors (S1, S2) disposed outside and inside the housing and a processing facility (AE) consisting of the pressure sensors (S1, S2) determined pressures (d1, d2), the differential pressure (dd, mdd) calculated.
  4. Arrangement according to claim 1 or 2, characterized that the at least one device for determining the differential pressure is designed as a differential pressure sensor (DD).
  5. Arrangement according to one of the preceding claims, characterized characterized in that the means (S1, S2, DD) for determining of the differential pressure value (dd, mdd) that exceeds or falls below the predetermined differential pressure value (ddmax) output signal (al) a control device (ST) supplies, which a shutdown of the electrical assembly (BG), a change the operation of the cooling device (VE) and / or an output of an alarm signal to one of the arrangement (BTS) associated monitoring device (OMC) controls.
  6. Arrangement according to one of the preceding claims, characterized characterized in that in the device (S1, S2, DD) for determining of the differential pressure value over averaged a number of determined differential pressure values (dd), and the averaged differential pressure value (mdd) with the predetermined Differential pressure value (ddmax) is compared.
  7. Filter arrangement for a housing (G) with arranged therein electrical assemblies (BG), with at least a filter (MB) enclosed by a frame (R) for filtering of at least dirt particles from the air flowing into the housing (G) for cooling the electrical assembly (BG), the frame (R) with the filter (MB) for one Arrangement in an air inlet (LE) of the housing (G) is designed, marked by at least one arranged in or on the frame (R) Device (DD, AE) for determining a differential pressure value (dd, mdd) between each upstream and downstream of the filter (MB) certain Pressure (d1, d2) of the ambient atmosphere, for comparing the determined Differential pressure value (dd, mdd) with a predetermined differential pressure value (ddmax) and to output a signal (al) when exceeded the predetermined differential pressure value (ddmax).
  8. Filter arrangement according to claim 7, characterized in that that the at least one device for determining the differential pressure is designed as a differential pressure sensor (DD).
DE102004041387A 2004-08-26 2004-08-26 Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short Ceased DE102004041387A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102004041387A DE102004041387A1 (en) 2004-08-26 2004-08-26 Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004041387A DE102004041387A1 (en) 2004-08-26 2004-08-26 Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short
DE200420020781 DE202004020781U1 (en) 2004-08-26 2004-08-26 Electrical assembly cooling arrangement for use in base station of portable radio communication system, has pressure sensors to determine and compare differential pressure values, where one signal is displayed, if values exceed/fall short
CN 200520011897 CN2838216Y (en) 2004-08-26 2005-08-26 Device for cooling electric components in casing

Publications (1)

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DE102004041387A1 true DE102004041387A1 (en) 2006-03-30

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DE (1) DE102004041387A1 (en)

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WO2011033270A3 (en) * 2009-09-21 2011-06-23 4Energy Limited Equipment cabinet
WO2011141272A1 (en) 2010-04-15 2011-11-17 Szasz, Daniela Claudia Cooling apparatus for electrical devices
EP2440307A2 (en) * 2009-06-12 2012-04-18 Clarcor Air Filtration Products, Inc. Air cooling system incorporating membrane-free filter and/or integral framing for filter
EP2596482A1 (en) * 2010-07-22 2013-05-29 Clarcor Air Filtration Products, Inc. Self service kiosk incorporating moisture repellant filter
AU2011254022B2 (en) * 2009-06-12 2014-02-13 Clarcor Air Filtration Products, Inc. Membrane-free filter and/or integral framing for filter
DE102014211959A1 (en) * 2014-06-23 2015-12-24 Volkswagen Aktiengesellschaft Apparatus for establishing pressure equalization and preventing intrusion of humidity for a system housing

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