Expansion valve of refrigerating cycle consisting of capacity variable compressor
AssigneeTgk Co., Ltd.
InventorHisatoshi Hirota
Life of this patent
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Abstract
An expansion valve of a refrigerating cycle contains a compressor with variable capacity that hunts the flow of the refrigerant as soon as the expansion valve starts to open in a condition where the capacity of the compressor is varied. The variation of the cross-section of the passage of the refrigerant in the expansion over a selected amount of the moving stroke of a valve body of the expansion valve is less than the variation of the cross-section with another moving stroke amount of the valve body 53. The stroke section or stroke range with the reduced gradient of the variation of the cross-section extends between a position E in a fully closed state and a position F in a middle part of the opening stroke of the expansion.
Claims12
An expansion valve in a refrigerating cycle comprising:
- a compressor with a variable capacity corresponding to variations of the compressor inhalation pressure;
- an expansion valve having a valve body disposed in a high pressure passage for high-pressure refrigerant supplied to an evaporator adjacent to a valve seat bore formed by a contraction in a middle portion of the high pressure passage;
- wherein the position of the valve body is controlled between a fully closed state and an opened state corresponding to variations of temperature and pressure of low-pressure refrigerant exiting the evaporator and passing through the expansion valve in a low-pressure passage;
- wherein a variation of a cross-section of the high pressure passage between the valve body and the valve seat bore for a first stroke increment of a lift stroke of the valve body from the fully closed state to an intermediate opening state position is smaller than a variation of the cross-section of the high pressure passage for a second stroke increment of the lift stroke from the intermediate opening state position to the opened state.
An expansion valve in a refrigerating cycle comprising:
- a compressor, the capacity of which is variable corresponding to variations of the compressor inhalation pressure;
- an expansion valve having a first refrigerant passage for high-pressure refrigerant to be supplied to an evaporator, and a second refrigerant passage for low-pressure refrigerant exiting the evaporator, a valve seat bore within the first passage and a valve body associated with the valve seat bore for a moving stroke in relation to the valve seat bore between a fully closed state position and a fully opened state position and into an intermediate opening state position, the valve body being driven through a total valve lift stroke by a temperature and/or pressure sensitive power element provided in temperature and pressure communication with the second passage;
- wherein the total valve lift stroke of the valve body in an opening direction is divided into a first stroke section and at least one further stroke section, the first stroke section beginning at the fully opened state position to the fully closed state position, the at least one further stroke section beginning at an end of the first stroke section;
- and
- wherein a variation of the cross-section within the first stroke section between the valve body and the valve seat bore for a first stroke increment is smaller than a variation of the cross-section for a second stroke increment of the same magnitude as the first stroke increment within the at least one further stroke section.
Dependencies are inferred from the claim text.