DE102010031391A1 - Evaporator module for refrigerant circuit of air conditioner in car, has ejector including two inputs, cladding link, and common output, where refrigerant supply is integrated in cladding link of ejector - Google Patents

Abstract

The module has an evaporator (5) provided with a collecting box (5a), and another evaporator (8) provided with another collecting box (8a). An ejector (4) includes two inputs, a cladding link (4c), and a common output, where refrigerant output from the former evaporator is fed to one of the inputs of the ejector, and a refrigerant mixture output from the ejector is supplied to the latter evaporator. A lid (21) is formed on the cladding link and connected to the collecting boxes of the evaporators. A refrigerant supply (9a, 9b) is integrated in the cladding link of the ejector. An independent claim is also included for a refrigerant circuit for an air conditioning apparatus of a motor vehicle, comprising a compressor.

Description

The invention relates to an evaporator module, in particular for a refrigerant circuit of an air conditioning system of a motor vehicle, according to the preamble of claim 1.

The DE 10 2008 051 892 A1 (please refer 1 ) describes a refrigerant circuit 1 with a first 5 and a second evaporator 8th and an ejector 4 , Such a device also has a compressor 2 which converts a refrigerant from an expanded to a compressed state. Downstream of the compressor is a condenser 3 which dissipates the heat generated in the compression of the refrigerant to the environment. The heat exchanger follows downstream as an ejector 4 trained expansion element. The ejector has a first input formed as a nozzle member 4a for a refrigerant in which the refrigerant is first expanded and accelerated in a highly directed jet. Subsequently, this jet mixes with refrigerant from one to a second input 4b branch of a first evaporator opening into the ejector 5 , The second entrance 4b is here in a sheath member 4c arranged.

In the suction of the refrigerant from the second input 4b becomes mechanical work of the directed fast jet of the nozzle member or the first input 4a used. The mixing of the two beams in the mixing tube 12 and the subsequent expansion of the directional mixed jet in a diffuser 6 of the ejector 4 lead to a pressure increase of the mixture. This mixture contains liquid and gaseous phase of the refrigerant. After leaving the ejector, the refrigerant enters a separator 7 one. This is the first evaporator 5 with a part of in the separator 7 fed incoming refrigerant. The remaining portion becomes a second evaporator 8th fed. There, a cooling capacity of the entire system is produced by evaporation of the liquid portions and corresponding heat exchange with air to be air-conditioned. Depending on the design of the separating element, the proportion of liquid refrigerant in the two partial streams may be the same or different, wherein an enrichment of the liquid phase of the partial flow to the first evaporator 5 is advantageous. The second evaporator 8th is a low pressure collector 10 downstream, in turn, the suction side of the compressor 2 follows. Upstream of the first evaporator 5 is an organ of expansion 9 arranged in which the refrigerant is depressurized to a low evaporation pressure.

Also from the DE 10 2008 051 892 A1 the applicant are various flow variants of the first and second evaporator known, wherein 2 an example of one of these Verschaltungsvarianten shows.

It is an object of the invention to provide an evaporator module which, with respect to this prior art, consists of fewer individual parts and thus can be produced more cost-effectively.

This object is achieved by an evaporator module with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

In one aspect of the invention, an evaporator module, in particular for a refrigerant circuit of an air conditioning system of a motor vehicle, a first evaporator with a first header and at least a second evaporator with a second header and an ejector with a nozzle member and a shell member, wherein the ejector is a first Entrance and at least one second input for supplying refrigerant, wherein the ejector has a common outlet to the outlet of a refrigerant mixture of the two inputs, wherein at least a portion of the discharged from the outlet refrigerant to the first evaporator can be fed and wherein the leaving the first evaporator refrigerant at least partially the second input of the ejector is fed and wherein at least a portion of the discharged from the outlet refrigerant to the second evaporator can be fed, wherein the jacket member of a cover element and at least one T. Eil of the first and / or second collection box is formed.

The formation of the jacket member from a cover element and at least a portion of the first and / or second header of the first and / or second evaporator material can be saved, since the jacket member at least partially formed from the existing outer contour of the first and / or second header The first and second evaporators are preferably soldered and the cover element is subsequently connected by means of a welded connection to the collecting box of the first and / or second evaporator. Thus, it is possible that after the soldering process and before closing the shell member by means of the lid member closely tolerated parts are readjusted or used (for example, the nozzle member).

Alternatively, however, the cover element can also be soldered to the collecting box of the first and / or second evaporator.

Preferably, the lid member is formed semi-cylindrical and has at its two end projections, which are formed to a To provide contact surface for a connection, in particular a material connection, with the first and second collection box. In this case, the length of the jacket member preferably corresponds substantially to the length of the two header boxes, so that overall a particularly good contact surface for a cohesive connection between the cover element on the one hand and the first and / or second header box on the other hand results.

In a further preferred embodiment, a feed of the refrigerant mixture is formed in the first and second evaporator in the shell member. By integrating the feed into the jacket member, the evaporator module can be made more compact overall and thus space-optimized.

Preferably, such an evaporator module in a refrigerant circuit, in particular for an air conditioner of a motor vehicle, comprising at least one compressor and a condenser, are used. Alternatively, the capacitor may be formed as a gas cooler. Preferably, such a refrigerant circuit may also have a low pressure header or a high pressure header with appropriate overheating control.

Embodiments of the invention will now be described below with reference to the drawings. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, in the drawing and in the claims features of the invention may be essential both individually and me in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article which would be limited in comparison to the subject matter claimed in the claims. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and from the drawing; this shows in:
Show it:

1 an evaporator module in a refrigerant circuit according to the prior art;

2 a schematic evaporator module according to the prior art

3 an inventive evaporator module in a front view;

4 an inventive evaporator module in a side view;

5 an inventive evaporator module in a sectional view along the line AA 4 ;

6 an inventive evaporator module in a sectional view taken along the line BB 5 ;

The 3 to 6 show an inventive evaporator module 11 in different views or sections. Such an evaporator module has a first evaporator 5 , a second evaporator 8th and an ejector configured as an expansion element 4 on (see 4 ) and is installed, for example, in a refrigerant circuit of a Klimaanalge a motor vehicle, as in the applications DE 10 2005 021 396 A1 respectively DE 10 2008 051 892 A1 is described, whose disclosure content is to be included without exception in this application.

The two evaporators 5 and 8th For example, have a plurality of flat tubes with corrugated ribs arranged therebetween and are preferably soldered together firmly. At the upper end of the two evaporators are each collection boxes 5a and 8a arranged so that a refrigerant can be distributed to the individual flat tubes, or collected from these again. Between the two collection boxes is an ejector 4 arranged.

The ejector 4 has a nozzle member 4a comprising a constant diameter lead portion, a first nozzle portion of conically tapered diameter in the flow direction of the refrigerant, a throat of minimum diameter, and a subsequent second nozzle portion of conically expanding flow diameter.

The nozzle member 4a protrudes in the shell member 4c into and is held against the shell member by means of a cover part.

The sheath member 4c has substantially the same length as the two headers 5a and 8a on. The sheath member shows how out 5 visible, three openings 4b . 9a and 9b on, which are formed at different ends of the sheath member, preferably at the locations where the sheath member 4c through the collection boxes 5a and or 8a is formed.

The refrigerant in the first input 4a flows, is first relaxed and accelerated in a highly directed jet. Subsequently, this jet mixes with refrigerant from one to a second input 4b branch of a first evaporator opening into the ejector 5 , The second entrance 4b is here in the shell member 4c arranged like this 5 can be seen.

In the suction of the refrigerant from the second input 4b becomes mechanical work of the directed fast jet of the nozzle member or the first input 4a used. The mixing of the two beams in the mixing tube 12 and the subsequent expansion of the directional mixed beam in the diffuser 6 or in a common exit 19 of the ejector 4 lead to an overall increase in pressure of the mixture. This mixture contains liquid and gaseous phase of the refrigerant (see 3 ).

The refrigerant is now over the opening 9a the collection box 5a or the first evaporator 5 fed. The remaining share will be through an opening 9b a collection box 8a or a second evaporator 8th fed. There, a cooling capacity of the entire system is produced by evaporation of the liquid portions and corresponding heat exchange with air to be air-conditioned.

The first evaporator 5 is designed so that the refrigerant that flows through the evaporator opening 9a is supplied, after a complete flow through the second input of the ejector 4b can be supplied. For example, the first evaporator 5 this two or more floods, which through one or more partitions in the collection box 5a be formed. The refrigerant therefore flows from the collecting tank 5a through a portion of the flat tubes ("1st tide") into a lower area of the evaporator, is there in a collector 5b deflected and flows through the remaining part of the flat tubes ("2nd tide") back into the collection box 5a from where there is the second input of the ejector 4b can be supplied, as for example in 2 is shown in a highly schematic form. Of course, a different number of floods is conceivable, for example three, four or a plurality of floods.

Analogously, the refrigerant mass flow in the evaporator 8th in the collection boxes 8a and 8b distributed and diverted and flows over an exit 20 in the other refrigerant circuit from.

How the particular 5 can be taken next to the opening 4b also the openings 9a and 9b in the shell member 4c formed, with the opening 9a has a smaller diameter than the openings 9b , Due to the small diameter 9a a throttling of the refrigerant is provided, so that it is possible to dispense with a further throttle element, for example to the throttle element 9a according to 2 ,

According to the invention, it is now provided that the jacket member 4c of the ejector 4 not by a separate tube, but by a cover element 21 and at least partially by the outer contour of the two headers 5a and 8a is formed (see 6 ). According to 6 the shell member is preferably by the cover element 21 and both outer contours of the headers formed. However, it is also conceivable that in an alternative embodiment, the jacket member 4c through the lid element 21 and is formed only by an outer contour of the two headers.

The cover element 21 has a semi-cylindrical shape and has at its two end projections 22 , which are designed to provide a contact surface for a material connection.

Overall, the evaporator module according to the invention results in a compact construction in which material and thus costs can be reduced.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008051892 A1 [0002, 0004, 0021]
• DE 102005021396 A1 [0021]

Claims (6)

Evaporator module ( 11 ), in particular for a refrigerant circuit ( 1 ) an air conditioning system of a motor vehicle, comprising a first evaporator ( 5 ) with a first collection box ( 5a ) and at least one second evaporator ( 8th ) with a second collection box ( 8a ) and an ejector ( 4 ) with a nozzle member ( 4a ) and a jacket member ( 4c ), wherein the ejector has a first input ( 4a ) and at least one second input ( 4b ) for supplying refrigerant, wherein the ejector has a common output ( 19 ) to the outlet of a refrigerant mixture of the two inputs ( 4a . 4b ), wherein at least a part of the from the output ( 19 ) discharged refrigerant to the first evaporator ( 5 ) can be fed and wherein the refrigerant leaving the first evaporator at least partially the second input ( 4b ) of the ejector ( 4 ) is fed and wherein at least a portion of the discharged from the outlet refrigerant to the second evaporator ( 8th ), characterized in that the jacket member ( 4c ) from a cover element ( 21 ) and at least part of the first and / or second collection box ( 5a . 8a ) is formed. Evaporator module according to claim 1, characterized in that the cover element ( 21 ) with the first and / or second collection box ( 5a . 8a ) Is connected by a material connection, in particular by soldering or welding. Evaporator module according to claim 1 or 2, characterized in that the cover element ( 21 ) is preferably formed semi-cylindrical and at its two end projections ( 22 ), which are designed to provide a contact surface for a connection, in particular a cohesive connection. Evaporator module according to one of the preceding claims, characterized in that a feed ( 9a . 9b ) of the refrigerant mixture in the first ( 5 ) and second evaporator ( 8th ) in the shell member ( 4c ) is trained. Evaporator module according to one of the preceding claims, characterized in that the length of the jacket member ( 4c ) substantially the length of the two header boxes ( 5a . 8a ) corresponds. Refrigerant circulation ( 1 ), in particular for an air conditioning system of a motor vehicle, comprising at least one compressor ( 2 ), a capacitor ( 3 ) and an evaporator module ( 11 ) according to any one of the preceding claims.

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