US20130205811A1 - Service unit for vehicle air-conditioning systems and method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system - Google Patents
Service unit for vehicle air-conditioning systems and method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system Download PDFInfo
- Publication number
- US20130205811A1 US20130205811A1 US13/823,222 US201113823222A US2013205811A1 US 20130205811 A1 US20130205811 A1 US 20130205811A1 US 201113823222 A US201113823222 A US 201113823222A US 2013205811 A1 US2013205811 A1 US 2013205811A1
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- US
- United States
- Prior art keywords
- coolant
- service unit
- vehicle air
- chimney
- collection chamber
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H1/00585—Means for monitoring, testing or servicing the air-conditioning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/002—Collecting refrigerant from a cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/005—Service stations therefor
- F25B2345/0052—Service stations therefor having wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/12—Inflammable refrigerants
Definitions
- the invention relates to a service unit for vehicle air-conditioning systems having the features of the preamble of claim 1 and a method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system having the features of the preamble of claim 10 .
- a vehicle air-conditioning system to be maintained consists substantially of a generally oil-lubricated compressor, a condenser, an evaporator, and pipelines which form a closed coolant system between these components. Furthermore, a dryer is generally provided, which can also act as a collector or reservoir for coolant. Finally, two service connections are incorporated in the coolant circuit for fluid exchange. The cold available at the evaporator in the vehicle is conducted away by a cold air blower and fed to the vehicle interior. The condensation heat of the condenser is conducted away by a warm air blower. Service connection connectors on the vehicle air-conditioning system allow coolant/compressor oil mixture to be drawn off or added at at least one, in particular the low-pressure (NP) service connection during maintenance.
- NP low-pressure
- Service units for vehicle air-conditioning systems serve among other things to drain the coolant circuit of a wide variety of vehicle air-conditioning systems from time to time and introduce a new coolant filling during maintenance. In this case it is necessary to observe precise quantities and coolant specifications. Moreover, in many cases lubricating oil for the compressor of the coolant circuit of the vehicle air-conditioning system must be removed and replenished. This also takes place in quantities and specifications depending on the vehicle type and air-conditioning unit type. Some vehicle air-conditioning systems also require an additive for the coolant circuit, which is likewise partially replaced during maintenance. Usually, the compressor oil passes into the coolant circuit and is circulated as well during operation of the vehicle air-conditioning system.
- service units for vehicle air-conditioning systems usually also have a separator, with which coolant can be separated from the coolant/compressor oil mixture for reuse. Used compressor oil and where necessary used additive is generally collected by the service unit in order to be discarded later.
- WO 2007/085480 of the applicant discloses a service unit for vehicle air-conditioning systems according to the block diagram and FIG. 1 .
- This shows the essential constituents of the generic service unit for a vehicle air-conditioning system in solid lines and a vehicle air-conditioning system to be maintained in dashed lines.
- the latter consists of an oil-lubricated compressor 1 , a condenser 2 , an evaporator 3 , and pipelines 4 A- 4 C forming a closed coolant system between these components.
- a dryer 5 is provided, which can also act as a collector or reservoir for coolant.
- two service connections 6 a/ 6 b are incorporated in the coolant circuit for fluid exchange.
- the cold available at the evaporator 3 in the vehicle is conducted away by a cold air blower 7 and fed to the vehicle interior.
- the condensation heat of the condenser 2 is conducted away by a warm air fan 8 .
- Service connection connectors 9 A and 9 B allow coolant/compressor oil mixture to be drawn off and added at the service connections 6 A, 6 B during maintenance.
- the vehicle air-conditioning system labelled 10 overall differs from vehicle type to vehicle type and does not form the subject matter of the present invention.
- a service unit, labelled 20 overall, for a vehicle air-conditioning system has flexible pressure hoses 11 A, 11 B for connecting the service unit 20 to the vehicle air-conditioning system 10 by means of the service connection connectors 9 A, 9 B at the service connections 6 A, 6 B.
- An extraction pump 12 configured as a coolant compressor delivers used coolant/compressor oil mixture via the pressure hoses 11 A and 11 B and the separator 14 . The latter separates coolant from the extracted mixture by evaporation and feeds it to a coolant store 15 configured as a pressurised tank. Compressor oil/additive mixture separated off in the separator 14 is collected in a replaceable used oil tank 15 and its weight is detected by means of a weighing device 17 A.
- An air-cooled coolant condenser 15 A is connected fixedly to the coolant store 15 . Recycled coolant is thereby fed predominantly in liquid form to the coolant store 15 .
- the whole coolant store including the condenser rests on a further weighing device 17 B for detecting the coolant fed and discharged and in store.
- a vacuum pump 13 After the extraction of the used mixture, a vacuum pump 13 provides the underpressure, which is necessary for refilling, in the circuit of the vehicle air-conditioning system and emits the extracted gas volume to the atmosphere.
- a refilling system labelled 19 overall consists substantially of replaceable storage tanks 19 D for compressor oil and 19 C for additives, a control unit 19 A with a valve block and control lines 19 B, a remote display 19 E and metering and valve units 19 F′ to 19 F′′′.
- the storage tanks 19 C and 19 D can preferably be weighed. Further weighing devices 17 C, 17 D are used for this purpose.
- a service unit for vehicle air-conditioning systems having a drainage and filling device for extracting the coolant/compressor oil mixture from the coolant circuit system of a vehicle air-conditioning system and for refilling the vehicle air-conditioning system with coolant and compressor oil, having a separation stage comprising at least one separator, a coolant compressor and a coolant weighing device, and having a vacuum pump for draining the residues of the coolant circuit system of the vehicle air-conditioning system is proposed, in which at least one pressure- and/or time-controlled switching valve block is provided for the optional direct fluid connection of the coolant circuit system to the separation stage and for the diversion of the flow connection from the coolant circuit system of the vehicle air-conditioning system via the vacuum pump to the separation stage.
- the invention is based on the object of being able to use inflammable or otherwise critical coolants, such as the coolant R-1234 yf, safely in a generic service unit for vehicle air-conditioning systems. This object is achieved by a service unit for vehicle air-conditioning systems having the features of claim 1 and a method having the features of claim 10 .
- the invention provides for a chimney-like gas collection chamber to be provided inside the service unit in a generic service unit for vehicle air-conditioning systems.
- the chimney-like gas collection chamber has an upper and a lower opening to the ambient atmosphere and is also sealed off from the ambient atmosphere.
- An active fan is provided in such a manner that ambient air can flow through the chimney-like gas collection chamber from top to bottom. This means that all the regions of the service unit which can come into contact with the gas of the coolant systematically or owing to leakages can be fluid-connected to the chimney-like gas collection chamber and sealed off from the remaining ambient atmosphere. Escaping coolant gas can thereby be kept away from unit parts which potentially form sparks. Other unit parts which are unavoidably fluid-connected to the ambient atmosphere are therefore sealed off from the chimney-like gas collection chamber.
- the active fan ensures that flow passes through the chimney-like gas collection chamber from top to bottom, for which ambient air is used. This means firstly that gas exchange also takes place in less accessible regions of the chimney-like gas collection chamber. Secondly, it is thereby possible to accommodate certain electrical components in the chimney-like gas collection chamber without the risk of explosion, deflagration or inflammation in the atmosphere of the chimney-like gas collection chamber increasing. This is advantageous in particular if customary vacuum pumps are used in the air-conditioning service unit, with which the electrical unit part of the vacuum pump can come into contact with the gas to be evacuated.
- the active ventilation ensures that such gas constituents are conducted quickly outwards, so that more complex vacuum pump designs with complete separation of the electrical part from the gas atmosphere are unnecessary. This active ventilation can be supported further by additional second and/or third active ventilation systems.
- the active fan can remain switched off during stoppage phases or phases when the service unit is not in use, because electrical sparks are not produced in these phases and it is therefore sufficient if the heavier gases sink inside the chimney-like gas collection chamber and exit the latter to the environment through the lower opening.
- the active fan or at least its electrically supplied component groups or where appropriate a unit controller are arranged outside the air-conditioning service unit or at least on the outer side thereof, potential ignition risks in the chimney-like gas collection chamber arising from the active fan itself can also be avoided.
- FIG. 2 shows the service unit for vehicle air-conditioning systems in vertical section (section along line I-I according to FIG. 3 ), and
- FIG. 3 shows the same unit in vertical section shifted 90° (section along line according to FIG. 2 )
- the chimney-like gas collection chamber 110 is for the most part formed by the unit walls 112 , which are closed in on themselves, on the outer sides of the unit, the unit cover 114 and a funnel-shaped bottom 118 or e.g. a perforated plate (not shown) situated at the lower end of the unit.
- a first electrical fan is docked from the outside of the unit onto the upper opening 110 A of the chimney-like gas collection chamber 110 .
- the lower opening 110 B of the chimney-like gas collection chamber 110 to the atmosphere is situated at the lower end of the funnel-shaped bottom 116 , perforated plate or the like.
- One or a plurality of sealing walls 118 in the unit interior can seal off the chimney-like gas collection chamber 110 from holding chambers 122 for accommodating storage tanks 124 A, 124 B, 124 C for compressor oils, additives, used circuit liquid and/or the like, which remain accessible from the outside of the unit.
- a fluid connection can however also exist between at least one of the holding chambers 122 and the chimney-like gas collection chamber 110 , if the at least one of the holding chambers 122 is sealed off at its unit outer wall 112 .
- the chimney-like gas collection chamber 110 is surrounded by an additional dashed line in FIGS. 2 and 3 by way of example and only for illustration purposes.
- a second fan 134 can additionally be arranged in the region of a unit wall 112 in order to ventilate the electric motor 132 A of the vacuum pump 132 additionally.
- An opening 134 A of a unit side wall 112 through which the fan is connected to the atmospheric air is provided for this.
- the additional air stream 134 B produced by the second fan 134 flows down together with the air stream 1208 produced by the active fan 120 via the bottom opening 110 B of the chimney-like gas collection chamber 110 as an aggregate air stream 140 .
- the latter can be connected to the external atmosphere via a third fan 136 .
- the fan 136 is fluid-connected via a further opening 138 A in the unit outer wall 112 and a ventilation duct 136 C to the external atmosphere.
- the chimney-like gas collection chamber 110 is thereby sealed off from the external atmosphere.
- the air stream produced by the third fan 136 also exits the service unit 100 with the aggregate air stream 114 via the lower opening 110 B of the chimney-like gas collection chamber [through] the unit bottom 116 .
- the third fan 136 and the electric motor of the vacuum pump and the compressor 128 are preferably connected in such a manner that they can only start up if the first fan 120 is in operation and the downward air stream in the chimney-like gas collection chamber 110 is consequently active.
- the second and third fans support the active ventilation of the chimney-like gas collection chamber 110 and its protective function.
Abstract
The invention relates to a service unit for vehicle air-conditioning systems, which is provided with an emptying and filling device for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system and replenishing the vehicle air-conditioning system with coolant and optionally with compressor oil. The device can include at least one tank for coolant and a vacuum pump for generating a negative pressure in the vehicle air-conditioning system emptied of coolant or coolant/compressor oil mixture for a subsequent intake of coolant and optionally compressor oil into the vehicle air-conditioning system to be replenished. A chimney-like gas-collecting chamber having upper and lower openings can be arranged inside the service unit and is otherwise sealed off from the surrounding atmosphere.
Description
- The invention relates to a service unit for vehicle air-conditioning systems having the features of the preamble of
claim 1 and a method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system having the features of the preamble ofclaim 10. - A vehicle air-conditioning system to be maintained consists substantially of a generally oil-lubricated compressor, a condenser, an evaporator, and pipelines which form a closed coolant system between these components. Furthermore, a dryer is generally provided, which can also act as a collector or reservoir for coolant. Finally, two service connections are incorporated in the coolant circuit for fluid exchange. The cold available at the evaporator in the vehicle is conducted away by a cold air blower and fed to the vehicle interior. The condensation heat of the condenser is conducted away by a warm air blower. Service connection connectors on the vehicle air-conditioning system allow coolant/compressor oil mixture to be drawn off or added at at least one, in particular the low-pressure (NP) service connection during maintenance. The vehicle air-conditioning systems differ from vehicle type to vehicle type and do not form the subject matter of the present invention.
- Service units for vehicle air-conditioning systems serve among other things to drain the coolant circuit of a wide variety of vehicle air-conditioning systems from time to time and introduce a new coolant filling during maintenance. In this case it is necessary to observe precise quantities and coolant specifications. Moreover, in many cases lubricating oil for the compressor of the coolant circuit of the vehicle air-conditioning system must be removed and replenished. This also takes place in quantities and specifications depending on the vehicle type and air-conditioning unit type. Some vehicle air-conditioning systems also require an additive for the coolant circuit, which is likewise partially replaced during maintenance. Usually, the compressor oil passes into the coolant circuit and is circulated as well during operation of the vehicle air-conditioning system. Only very specific pairings of coolant and compressor oil are compatible with each other for this purpose. In order to be able to recover at least some of the coolant for reuse after extraction of the coolant/compressor oil mixture, service units for vehicle air-conditioning systems usually also have a separator, with which coolant can be separated from the coolant/compressor oil mixture for reuse. Used compressor oil and where necessary used additive is generally collected by the service unit in order to be discarded later.
- WO 2007/085480 of the applicant discloses a service unit for vehicle air-conditioning systems according to the block diagram and
FIG. 1 . This shows the essential constituents of the generic service unit for a vehicle air-conditioning system in solid lines and a vehicle air-conditioning system to be maintained in dashed lines. The latter consists of an oil-lubricatedcompressor 1, a condenser 2, an evaporator 3, andpipelines 4A-4C forming a closed coolant system between these components. Furthermore, adryer 5 is provided, which can also act as a collector or reservoir for coolant. Finally, two service connections 6 a/ 6 b are incorporated in the coolant circuit for fluid exchange. The cold available at the evaporator 3 in the vehicle is conducted away by acold air blower 7 and fed to the vehicle interior. The condensation heat of the condenser 2 is conducted away by awarm air fan 8.Service connection connectors service connections 6A, 6B during maintenance. The vehicle air-conditioning system labelled 10 overall differs from vehicle type to vehicle type and does not form the subject matter of the present invention. - A service unit, labelled 20 overall, for a vehicle air-conditioning system has
flexible pressure hoses service unit 20 to the vehicle air-conditioning system 10 by means of theservice connection connectors service connections 6A, 6B. Anextraction pump 12 configured as a coolant compressor delivers used coolant/compressor oil mixture via thepressure hoses separator 14. The latter separates coolant from the extracted mixture by evaporation and feeds it to acoolant store 15 configured as a pressurised tank. Compressor oil/additive mixture separated off in theseparator 14 is collected in a replaceable usedoil tank 15 and its weight is detected by means of a weighing device 17A. An air-cooledcoolant condenser 15A is connected fixedly to thecoolant store 15. Recycled coolant is thereby fed predominantly in liquid form to thecoolant store 15. The whole coolant store including the condenser rests on a further weighing device 17B for detecting the coolant fed and discharged and in store. After the extraction of the used mixture, avacuum pump 13 provides the underpressure, which is necessary for refilling, in the circuit of the vehicle air-conditioning system and emits the extracted gas volume to the atmosphere. - A refilling system labelled 19 overall consists substantially of
replaceable storage tanks 19D for compressor oil and 19C for additives, acontrol unit 19A with a valve block andcontrol lines 19B, aremote display 19E and metering andvalve units 19F′ to 19F′″. Thestorage tanks Further weighing devices -
DE 20 2008 003 123 U1 discloses a further service unit for vehicle air-conditioning systems of the applicant, in which the ability of the previously evacuated vehicle air-conditioning system to be refilled is improved by a heat source, which is provided in the coolant storage tank and serves to increase the pressure of the coolant. - The still unpublished German Patent Application No. 10 2009 054 436.4 of the applicant, filed on 25 Nov. 2009, the disclosure content of which is included in the present patent application, discloses detecting the quantities of coolant initially present in the coolant circuit system of the vehicle air-conditioning system as precisely as possible during maintenance of vehicle air-conditioning systems, in order to improve diagnosis of the condition of the vehicle air-conditioning system. To this end, a service unit for vehicle air-conditioning systems having a drainage and filling device for extracting the coolant/compressor oil mixture from the coolant circuit system of a vehicle air-conditioning system and for refilling the vehicle air-conditioning system with coolant and compressor oil, having a separation stage comprising at least one separator, a coolant compressor and a coolant weighing device, and having a vacuum pump for draining the residues of the coolant circuit system of the vehicle air-conditioning system is proposed, in which at least one pressure- and/or time-controlled switching valve block is provided for the optional direct fluid connection of the coolant circuit system to the separation stage and for the diversion of the flow connection from the coolant circuit system of the vehicle air-conditioning system via the vacuum pump to the separation stage.
- The invention is based on the object of being able to use inflammable or otherwise critical coolants, such as the coolant R-1234 yf, safely in a generic service unit for vehicle air-conditioning systems. This object is achieved by a service unit for vehicle air-conditioning systems having the features of
claim 1 and a method having the features ofclaim 10. - Accordingly, the invention provides for a chimney-like gas collection chamber to be provided inside the service unit in a generic service unit for vehicle air-conditioning systems. The chimney-like gas collection chamber has an upper and a lower opening to the ambient atmosphere and is also sealed off from the ambient atmosphere. An active fan is provided in such a manner that ambient air can flow through the chimney-like gas collection chamber from top to bottom. This means that all the regions of the service unit which can come into contact with the gas of the coolant systematically or owing to leakages can be fluid-connected to the chimney-like gas collection chamber and sealed off from the remaining ambient atmosphere. Escaping coolant gas can thereby be kept away from unit parts which potentially form sparks. Other unit parts which are unavoidably fluid-connected to the ambient atmosphere are therefore sealed off from the chimney-like gas collection chamber.
- The active fan ensures that flow passes through the chimney-like gas collection chamber from top to bottom, for which ambient air is used. This means firstly that gas exchange also takes place in less accessible regions of the chimney-like gas collection chamber. Secondly, it is thereby possible to accommodate certain electrical components in the chimney-like gas collection chamber without the risk of explosion, deflagration or inflammation in the atmosphere of the chimney-like gas collection chamber increasing. This is advantageous in particular if customary vacuum pumps are used in the air-conditioning service unit, with which the electrical unit part of the vacuum pump can come into contact with the gas to be evacuated. The active ventilation ensures that such gas constituents are conducted quickly outwards, so that more complex vacuum pump designs with complete separation of the electrical part from the gas atmosphere are unnecessary. This active ventilation can be supported further by additional second and/or third active ventilation systems.
- If the atmosphere in the chimney-like gas collection chamber is heavier overall than air, the active fan can remain switched off during stoppage phases or phases when the service unit is not in use, because electrical sparks are not produced in these phases and it is therefore sufficient if the heavier gases sink inside the chimney-like gas collection chamber and exit the latter to the environment through the lower opening.
- If the active fan or at least its electrically supplied component groups or where appropriate a unit controller are arranged outside the air-conditioning service unit or at least on the outer side thereof, potential ignition risks in the chimney-like gas collection chamber arising from the active fan itself can also be avoided.
- The components to be used according to the invention which are mentioned above, as well as those claimed and described in the exemplary embodiments, are not subject to any special exceptional conditions in terms of their size, shape, material and technical design, so the selection criteria known in the field of application can be used without restriction.
- Further details, features and advantages of the subject matter of the invention can be found in the subclaims, and in the description of the associated drawing and table below, in which an exemplary embodiment of an air-conditioning service unit is shown by way of example.
- In the drawing,
-
FIG. 2 shows the service unit for vehicle air-conditioning systems in vertical section (section along line I-I according toFIG. 3 ), and -
FIG. 3 shows the same unit in vertical section shifted 90° (section along line according toFIG. 2 ) - As can be seen in the sectional diagrams of
FIGS. 2 and 3 , the chimney-like gas collection chamber 110 is for the most part formed by the unit walls 112, which are closed in on themselves, on the outer sides of the unit, the unit cover 114 and a funnel-shaped bottom 118 or e.g. a perforated plate (not shown) situated at the lower end of the unit. As the active fan 120, a first electrical fan is docked from the outside of the unit onto the upper opening 110A of the chimney-like gas collection chamber 110. The lower opening 110B of the chimney-like gas collection chamber 110 to the atmosphere is situated at the lower end of the funnel-shaped bottom 116, perforated plate or the like. One or a plurality of sealing walls 118 in the unit interior can seal off the chimney-like gas collection chamber 110 from holding chambers 122 for accommodating storage tanks 124A, 124B, 124C for compressor oils, additives, used circuit liquid and/or the like, which remain accessible from the outside of the unit. A fluid connection can however also exist between at least one of the holding chambers 122 and the chimney-like gas collection chamber 110, if the at least one of the holding chambers 122 is sealed off at its unit outer wall 112. The chimney-like gas collection chamber 110 is surrounded by an additional dashed line inFIGS. 2 and 3 by way of example and only for illustration purposes. - Inside the chimney-like gas collection chamber there are, in addition to a collection tank 126 for coolant, a compressor 128 and a condenser 130 and a vacuum pump 132 with an electric motor 132A and compressor part 132B, among other things. These unit parts and the rest of the air-conditioning unit 100 can interact in the manner corresponding to the prior art shown in
FIG. 1 . - A second fan 134 can additionally be arranged in the region of a unit wall 112 in order to ventilate the electric motor 132A of the vacuum pump 132 additionally. An opening 134A of a unit side wall 112 through which the fan is connected to the atmospheric air is provided for this. The additional air stream 134B produced by the second fan 134 flows down together with the air stream 1208 produced by the active fan 120 via the bottom opening 110B of the chimney-like gas collection chamber 110 as an aggregate air stream 140.
- In order to ensure sufficient heat dissipation at the condenser 130, the latter can be connected to the external atmosphere via a third fan 136. To this end, the fan 136 is fluid-connected via a further opening 138A in the unit outer wall 112 and a ventilation duct 136C to the external atmosphere. The chimney-like gas collection chamber 110 is thereby sealed off from the external atmosphere. The air stream produced by the third fan 136 also exits the service unit 100 with the aggregate air stream 114 via the lower opening 110B of the chimney-like gas collection chamber [through] the unit bottom 116.
- The third fan 136 and the electric motor of the vacuum pump and the compressor 128 are preferably connected in such a manner that they can only start up if the first fan 120 is in operation and the downward air stream in the chimney-like gas collection chamber 110 is consequently active. The second and third fans support the active ventilation of the chimney-like gas collection chamber 110 and its protective function.
- 1 Compressor
- 2 Evaporator
- 3 Condenser
- 4A-C Pipelines
- 5 Separator
- 8A/B Service connections
- 7 Cold air blower
- 8 Warm air blower
- 9A/B Service connection connectors
- 10 Vehicle air-conditioning system
- 11A/B Pressure hoses
- 12 Extraction pump
- 13 Vacuum pump
- 14 Separator
- 15 Coolant store
- 15A Coolant condenser
- 16 Used oil tank
- 17A-J Weighing devices
- 18 Unloading device
- 19 Refilling system
- 19A Control unit with valve block
- 19B Control lines
- 19C Storage tank
- 19D Storage tank
- 19E Remote display
- 19F′ Metering and valve unit
- 19F″ Metering and valve unit
- 19F′″ Metering and valve unit
- 20 Service unit
- 26A Low pressure manometer
- 26B High pressure manometer
- 100 Service unit
- 110 Gas collection chamber
- 110A Upper opening
- 110B Lower opening
- 112 Side walls
- 114 Unit cover
- 116 Bottom
- 118 Sealing wall
- 120 Active fan
- 122 Holding chamber
- 124A-C Storage tank
- 126 Coolant tank
- 128 Compressor
- 130 Condenser
- 132 Vacuum pump
- 132A Electric motor
- 132B Compressor
- 134 Second fan
- 134A Opening
- 134B Additional air stream
- 136 Third fan
- 136A Opening
- 136C Ventilation duct
- 140 Aggregate air stream
Claims (12)
1. A service unit for vehicle air-conditioning systems,
having a drainage device and a filling device for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system and for refilling the vehicle air-conditioning system with coolant and where necessary with compressor oil,
having at least one tank (126) for coolant and
having a vacuum pump (132) for producing an underpressure in the vehicle air-conditioning system which has been drained of coolant or coolant/compressor oil mixture for a subsequent extraction of coolant and where necessary compressor oil in the vehicle air-conditioning system to be refilled,
characterised in that
a chimney-like gas collection chamber (110) having upper and lower openings (110A, 110B) is arranged inside the service unit (100) and is otherwise sealed off from the ambient atmosphere, and
an active fan (120) is provided for the flow of ambient air through the chimney-like gas collection chamber (110) from top to bottom.
2. The service unit according to claim 1 , characterised in that at least the unit parts of the active fan (120) and/or any additional active fans to which electrical voltage is applied and/or the control system thereof are arranged outside or on the outer side of the service unit.
3. The service unit according to claim 1 , characterised by an additional active fan (134) for loading a vacuum pump (132) arranged inside the chimney-like gas collection chamber (110) with ambient air.
4. The service unit according to claim 1 , characterised in that at least one, in particular a customary, vacuum pump (132) is used in the air-conditioning service unit, in which the electrical unit part of the vacuum pump (132) comes into contact with the gas to be evacuated.
5. The service unit according to claim 1 , characterised by an additional active fan (136) for loading a condenser (130) arranged inside the chimney-like gas collection chamber (110) with ambient air.
6. The service unit according to claim 1 , characterised in that the air streams of all the active fans can be conducted as an aggregate air stream (140) via a bottom exit opening (110B) of the chimney-like gas collection chamber (110).
7. The service unit according to claim 1 , characterised in that additional storage tanks (124A, 124B, 124C) of the service unit are sealed off fluidically from the chimney-like gas collection chamber (110) by at least one sealing wall (118).
8. The service unit according to claim 1 , characterised in that in particular all the regions of the service unit which come or can come into contact with the gas of the coolant systematically or owing to leakages are or can be fluid-connected to the chimney-like gas collection chamber and shut off from the remaining ambient atmosphere.
9. The service unit according to claim 1 , characterised in that any further fans, the electric motor of any vacuum pump and/or a compressor are preferably connected in such a manner that they can generally only start up if the downward air stream in the chimney-like gas collection chamber 110 is active.
10. A method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system and for refilling the vehicle air-conditioning system with coolant and where necessary with compressor oil by means of a service unit having at least one tank for coolant and having a vacuum pump for producing an underpressure in the vehicle air-conditioning system which has been drained of coolant or coolant/compressor oil mixture for subsequent extraction of coolant and where necessary of compressor oil into the vehicle air-conditioning system to be refilled,
characterised in that
a chimney-like gas collection chamber having upper and lower openings is provided inside the service unit and is shut off from the remaining ambient atmosphere, and
ambient air flows through the chimney-like gas collection chamber from top to bottom, in particular by means of at least one active fan.
11. The method according to claim 10 , characterised in that the at least one active fan for the chimney-like gas collection chamber remains switched off during stoppage phases or phases in which the service unit is not used, and the gases are left to sink downwards inside the chimney-like gas collection chamber, so that they exit the chimney-like gas collection chamber through the lower opening towards the ambient atmosphere.
12. The method according to claim 10 , comprising a separation step for coolant/compressor oil mixture, characterised in that residues are drained from the coolant circuit system of the vehicle air-conditioning system by means of a vacuum pump, and the coolant circuit system is fluid-connected to a separation stage for coolant/compressor oil mixture via the vacuum pump for the purpose of recovering coolant from the residue drainage of the coolant circuit system.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202010012578U DE202010012578U1 (en) | 2010-09-14 | 2010-09-14 | Service device for vehicle air conditioners |
DE202010012578.2 | 2010-09-14 | ||
PCT/EP2011/004621 WO2012034695A1 (en) | 2010-09-14 | 2011-09-14 | Service unit for vehicle air-conditioning systems and method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130205811A1 true US20130205811A1 (en) | 2013-08-15 |
Family
ID=44862914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/823,222 Abandoned US20130205811A1 (en) | 2010-09-14 | 2011-09-14 | Service unit for vehicle air-conditioning systems and method for removing the coolant or a coolant/compressor oil mixture from a vehicle air-conditioning system |
Country Status (5)
Country | Link |
---|---|
US (1) | US20130205811A1 (en) |
EP (1) | EP2616258B1 (en) |
CN (1) | CN103237671B (en) |
DE (1) | DE202010012578U1 (en) |
WO (1) | WO2012034695A1 (en) |
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US20140223928A1 (en) * | 2011-05-23 | 2014-08-14 | Dometico Waeco International Gmbc | Servicing device for vehicle air-conditioning systems and method for operating said device |
US20170030617A1 (en) * | 2015-07-28 | 2017-02-02 | Brain Bee Holding S.P.A. | Method for transferring coolant from a loading unit to an air conditioning system |
US9651284B2 (en) | 2011-02-21 | 2017-05-16 | Dometic Sweden Ab | Service device for vehicle air conditioning systems, and method for operating same, in particular for the self-cleaning type |
US9834062B2 (en) | 2009-11-25 | 2017-12-05 | Dometic Sweden Ab | Method for maintaining a vehicle air conditioning unit and service apparatus therefor |
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- 2011-09-14 EP EP11775728.6A patent/EP2616258B1/en not_active Not-in-force
- 2011-09-14 US US13/823,222 patent/US20130205811A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
EP2616258B1 (en) | 2016-02-24 |
CN103237671B (en) | 2016-09-07 |
WO2012034695A1 (en) | 2012-03-22 |
DE202010012578U1 (en) | 2011-12-21 |
EP2616258A1 (en) | 2013-07-24 |
CN103237671A (en) | 2013-08-07 |
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