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Expansion valve control method, and expansion valve

An expansion valve, refrigerant technology, applied in the direction of lift valve, valve details, valve device, etc., can solve the problem of taking too long to cool down, and achieve the effect of improving response characteristics

Inactive Publication Date: 2008-03-05
OTTO EGELHOF GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high ambient temperatures, it often takes too long to achieve maximum cooling capacity

Method used

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  • Expansion valve control method, and expansion valve
  • Expansion valve control method, and expansion valve
  • Expansion valve control method, and expansion valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] Figure 1 shows a refrigeration circuit 11 preferably operated with carbon dioxide. The refrigeration circuit 11 is used, for example, in a vehicle air conditioning system. The compressor 12 supplies the compressed refrigerant on the high-pressure side to the external heat exchanger 14 . The latter is connected to the environment and outputs heat to the outside. Connected downstream of the latter is an internal heat exchanger 15 which supplies refrigerant to an expansion valve 16 via a feed line 17 . Upstream of the high-pressure side expansion valve 16 there is an inlet pressure which can be 120 bar, for example, in summer. Refrigerant flows through expansion valve 16 and to the low pressure side. On the output side, under steady state conditions, the expansion valve 16 has a pressure between 35-45 bar. The refrigerant cooled by the pressure release enters the interior heat exchanger 21 via the discharge line 18 and will remove heat from the environment, with the re...

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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

technical field [0001] According to the preamble features of claims 1 and 2, the invention relates to an expansion valve control method and an expansion valve, which are particularly suitable for use with CO 2 A vehicle air conditioning system that operates as a refrigerant. Background technique [0002] DE 10 2004 010 997 B3 discloses an expansion valve and a method for controlling it, in which the opening and closing movement of the valve closing member is set as a function of the pressure difference existing between the inlet on the high pressure side and the outlet of the expansion valve on the low pressure side . When the refrigeration circuit is not in operation, the reset device keeps the valve closing member in the closed state. [0003] Expansion valves of this type which operate as a function of the pressure difference between the high-pressure side and the low-pressure side have to satisfy a wide variety of operating conditions in an optimal manner. Rapid respo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/00F16K31/68F25B41/06
CPCF25B2400/0411F25B2500/07F25B2341/063F25B41/062F25B9/008F25B2309/061F25B41/325F25B41/33F25B41/36
Inventor J·-J·罗宾
Owner OTTO EGELHOF GMBH & CO KG
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