Air conditioner

Details Air conditioner Air conditioner

2001-05-17

2003-11-18

Wayner, William (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C073S661000, C073S756000

Reexamination Certificate

active

06647737

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner.
A typical air conditioner of a vehicle includes a variable displacement type compressor and a displacement control mechanism for controlling the displacement of the compressor.
FIG. 7
shows the displacement control mechanism by way of example. More specifically, a pressure monitoring point P is located in a refrigerant passage
101
, which forms a refrigerant circuit. A pressure detecting device
102
detects the pressure of the refrigerant at the pressure monitoring point P. A pressure detecting passage
103
connects the pressure monitoring point P to the pressure detecting device
102
. The refrigerant pressure at the pressure monitoring point P is thus supplied to the pressure detecting device
102
. A compressor control device
104
controls the displacement of the variable displacement compressor in relation to the refrigerant pressure detected by the pressure detecting device
102
.
As indicated in the circle of
FIG. 7
, the pressure detecting passage
103
has a pressure detecting port
103
a
that opens to the refrigerant passage
101
. Accordingly, if the position of the pressure detecting port
103
a
relative to the refrigerant passage
101
need be altered, it is necessary to change the arrangement of the pressure detecting passage
103
, thus causing trouble.
Particularly, if the pressure monitoring point P is located in the refrigerant passage
101
that is formed in a housing member of the compressor, the arrangement of the pressure detecting passage
103
in the housing member is restricted by the structure of the compressor. This makes it difficult to locate the pressure detecting port
103
a
at a desired position.
BRIEF SUMMARY OF THE INVENTION
It is an objective of the present invention to provide an air conditioner that easily alters the position of a pressure detecting port relative to a refrigerant passage.
To achieve the above objective, the present invention provides an air conditioning apparatus, which is provided with a refrigerant circuit that includes a variable displacement compressor. The air conditioner includes a displacement control mechanism, which controls the displacement of the compressor in accordance with a pressure at a pressure monitoring point in the refrigerant circuit. A pressure introducing passage connects the refrigerant circuit to the displacement control mechanism for supplying the pressure of the refrigerant in the refrigerant circuit from the pressure monitoring point to the displacement control mechanism. The pressure introducing passage has an opening to the refrigerant circuit. An inlet member is located at a position corresponding to the opening. The inlet member has a pressure introducing port that functions as the pressure monitoring point. The pressure of the refrigerant in the refrigerant circuit is supplied from the pressure introducing port to the displacement control mechanism through the pressure introducing passage.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


REFERENCES:
patent: 2296822 (1942-09-01), Wolfert
patent: 3100972 (1963-08-01), Mobarry
patent: 6105380 (2000-08-01), Yokomachi et al.
patent: 0 748 937 (1986-12-01), None
patent: 0 748 937 (1997-01-01), None
patent: 0935107 (1999-08-01), None
patent: 0 997 640 (2000-05-01), None
patent: 0 997 640 (2000-10-01), None
patent: 0935107 (2002-01-01), None
patent: 11-324930 (1999-11-01), None

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