Method for controlling an expansion valve and expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant

a technology of expansion valve and expansion valve, which is applied in the direction of gas cycle refrigeration machines, compression machines, mechanical equipment, etc., can solve the problem of generally taking too long for the maximum cooling power to be obtained under high ambient temperatur

Inactive Publication Date: 2007-12-27
OTTO EGELHOF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] According to a further advantageous refinement of the pressure-dependent bypass valve, it is provided that the valve-closing member closing the passage is arranged on the high-pressure side and has a closing element, in particular spring element, acting towards the valve seat. As a result, a closed position can be ensured when the vehicle is inoperative.

Problems solved by technology

It generally takes too long for the maximum cooling power to be obtained under high ambient temperatures.

Method used

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  • Method for controlling an expansion valve and expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant
  • Method for controlling an expansion valve and expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant
  • Method for controlling an expansion valve and expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant

Examples

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Embodiment Construction

[0027]FIG. 1 illustrates a refrigerant circuit 11 which is preferably operated with CO2. This refrigerant circuit 11 is used, for example, as a vehicle air-conditioning system. A compressor 12 feeds the compressed refrigerant on the high-pressure side to an outside heat exchanger 14. The latter is connected to the surroundings and outputs heat outwards. Connected downstream of the latter is an inside heat exchanger 15 which feeds the refrigerant to an expansion valve 16 via a feed line 17. Upstream of the expansion valve 16 on the high-pressure side there is an input pressure which, for example in summer, can be 120 bar. The refrigerant flows through the expansion valve 16 and passes to the low-pressure side. On the output side, the expansion valve 16 has pressures of between 35 and 45 bar under stationary conditions. The refrigerant, which is cooled by the relaxation of the pressure, passes via a removal line 18 into the inside heat exchanger 21 and will remove heat from the surrou...

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Abstract

The invention relates to a method for controlling an expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant, with a valve housing which has a feed opening and a removal opening, with a valve-closing member which closes a valve seat of a passage opening arranged between the feed and removal openings, and with a resetting device which acts in the closing direction of the valve-closing member, an adjusting element, which is assigned to the valve-closing member, on the low-pressure side being activated via a predetermined threshold value as the low pressure rises or as the temperature on the low-pressure side rises and actuates at least one actuating element by means of which a closing force of the resetting device acting on the valve-closing member is reduced such that a passage opening is enlarged or a passage of a bypass valve arranged on the low-pressure side, which passage is arranged parallel to the passage opening, is opened.

Description

[0001] Applicant herein incorporates by reference the following foreign priority document: German Appln. No. 10 2006 021 327.0, filed May 5, 2006. BACKGROUND OF THE INVENTION [0002] The invention relates to a method for controlling an expansion valve and to an expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant, in accordance with the precharacterizing clause of Claim 1 and 2. [0003] DE 10 2004 010 997 B3 discloses an expansion valve and a method for controlling it, in which the opening and closing movement of a valve-closing member is set as a function of the pressure differential present in a feed opening on the high-pressure side and in a removal opening of the expansion valve on the low-pressure side. A resetting device keeps the valve-closing member in a closed position when the refrigerant circuit is not in operation. [0004] An expansion valve of this type which operates as a function of the pressure differential between the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B41/04
CPCF25B9/008F25B41/062F25B2500/07F25B2341/063F25B2400/0411F25B2309/061F25B41/325F25B41/33F25B41/36
Inventor ROBIN, JEAN-JACQUES
Owner OTTO EGELHOF
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