US 2020/0400133 A1 · CONTROL VALVE AND VARIABLE CAPACITY COMPRESSOR

Abstract

A control valve and a variable capacity compressor which are capable of preventing an unnecessary loss of control gas to improve efficiency of the compressor reduces loss of control gas by eliminating a fixed orifice hole in an existing valve assembly and forming it in a control valve or a passage connecting the control valve and a crank chamber. The size of the fixed orifice hole is variable (which is possible by selectively opening and closing a plurality of holes) depending on the operation of the compressor. On the other hand, forming the fixed orifice hole in the passage connecting the control valve and the crank chamber causes the loss of control gas to be reduced because the fixed orifice hole can be machined to a smaller size compared to an existing orifice hole, the minimum size of which is limited due to difficulty of machining.

Claims15

Dependent claims

A control valve to adjust an angle of a swash plate of a variable capacity compressor, the control valve comprising:

a valve housing having a first hole in communication with a discharge chamber of the compressor, a second hole in communication with a crank chamber, and a third hole in communication with a suction chamber;
a first passage allowing the first hole to communicate with the second hole and a second passage allowing the second hole to communicate with the third hole in the valve housing;
a first switching means for opening and closing the first passage;
and
a second switching means for opening and closing the second passage,
wherein the first passage is fully opened and the second passage is partially opened in a first condition in which an angle of inclination of the swash plate is decreased to minimize a movement distance of a piston, and the first passage is fully closed and the second passage is fully opened in a second condition in which the angle of inclination of the swash plate is increased to maximize the movement distance of the piston.

3 more elements

A variable capacity compressor comprising:

a crank chamber having a swash plate disposed therein;
a piston connected to the swash plate;
a cylinder bore into which the piston is inserted, a refrigerant being sucked into the cylinder bore, compressed therein, and then discharged therefrom;
a suction chamber for providing the refrigerant transmitted from the outside to the cylinder bore;
a discharge chamber for transmitting the refrigerant discharged from the cylinder bore to the outside;
a control valve connected to the crank chamber, the suction chamber, and the discharge chamber to adjust an angle of the swash plate;
and
an orifice hole formed in a passage connecting the control valve and the crank chamber to connect the crank chamber and the suction chamber.

5 more elements

Dependencies are inferred from the claim text.

Control valve and variable capacity compressor

Life of this patent

Control valve and variable capacity compressor

Life of this patent

Abstract

Claims15