US 6,443,708 B1Granted

Compression volume control apparatus for refrigeration cycle

AssigneeTgk Co., Ltd.

InventorHisatoshi Hirota

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Abstract

An electromagnetic control valve of a fast response compression volume control apparatus for a refrigeration cycle is provided which connects and blocks a pressure adjusting chamber of the compressor to and from a discharge chamber or a suction chamber such that the a differential pressure between at least one of a pressure in the pressure adjusting chamber and a pressure in the suction chamber and a pressure in the discharge chamber is maintained at a predetermined differential pressure value. The differential pressure is changed by changing the electromagnetic force of the electromagnetic control valve such that the discharge volume of the refrigerant is controlled and the compression volume becomes a predetermined one in a prompt action without a time delay when the electromagnetic force is varied.

Claims14

Dependent claims

A compression volume control apparatus for a refrigeration cycle, comprising:

a variable displacement refrigerant compressor having a suction chamber;
a low-pressure refrigerant pipe connected to the variable displacement refrigerant compressor;
a high-pressure refrigerant pipe;
a refrigerant discharge chamber connected to the high-pressure refrigerant pipe;
a pressure adjusting chamber;
and
an electromagnetic control valve operating by electromagnetic force coupled in flow connection between the pressure adjusting chamber and at least one of the refrigerant discharge chamber and the suction chamber,
wherein the refrigerant discharge volume is variable by varying a pressure in the pressure adjusting chamber,
wherein the electromagnetic control valve controls a differential pressure between at least one of a pressure in the pressure adjusting chamber and a pressure in the suction chamber at one side of the electromagnetic control valve and the electromagnetic control valve controls a pressure in the discharge chamber at another side of the electromagnetic control valve to a predetermined differential pressure value to control a refrigerant discharge volume, and
wherein the differential pressure value is variable by varying the electromagnetic force of the electromagnetic control valve.

7 more elements

A compression volume control apparatus for a refrigeration cycle, comprising:

a variable displacement refrigerant compressor having a suction chamber;
a low-pressure refrigerant pipe connected to the variable displacement refrigerant compressor;
a high-pressure refrigerant pipe;
a refrigerant discharge chamber connected to the high-pressure refrigerant pipe;
a pressure adjusting chamber;
and
an electromagnetic control valve including a valve body loaded by electromagnetic force towards a valve seat provided in flow connection between separated passages connected to regions having differing pressure states,
wherein the refrigerant discharge volume is variable by varying a pressure in the pressure adjusting chamber,
wherein the valve body co-acts with the valve seat to maintain a predetermined differential pressure at a substantially predetermined differential pressure value in proportion to the electromagnetic force,
wherein the predetermined differential pressure value is variable by varying the electromagnetic force of the electromagnetic control valve,
wherein the valve seat is provided between a passage connected to the pressure adjusting chamber and a passage connected to the discharge chamber, and
wherein the valve body is facing the valve seat from the side of the passage connected to the pressure adjusting chamber and the electromagnetic force loads the valve body in a closing direction towards the valve seat and counter to a pressure in the passage connected to the discharge chamber.

9 more elements

A compression volume control apparatus for a refrigeration cycle, comprising:

a variable displacement refrigerant compressor having a suction chamber;
a low-pressure refrigerant pipe connected to the variable displacement refrigerant compressor;
a high-pressure refrigerant pipe;
a refrigerant discharge chamber connected to the high-pressure refrigerant pipe;
a pressure adjusting chamber;
and
an electromagnetic control valve including a valve body loaded by electromagnetic force towards a valve seat provided in flow connection between separated passages connected to regions having differing pressure states,
wherein the refrigerant discharge volume is variable by varying a pressure in the pressure adjusting chamber,
wherein the valve body co-acts with the valve seat to maintain a predetermined differential pressure at a substantially predetermined differential pressure value in proportion to the electromagnetic force,
wherein the predetermined differential pressure value is variable by varying the electromagnetic force of the electromagnetic control valve,
wherein the valve seat is provided between a passage connected to the pressure adjusting chamber and a passage connected to the suction chamber,
wherein the valve body is facing the valve seat at a side of the passage connected to the suction chamber,
wherein the valve body has an axial piston rod extending from the passage connected to the suction chamber into a further separate passage connected to the discharge chamber,
wherein a suction chamber pressure is balanced at the valve body and piston rod,
wherein a pressure at the passage connected to the pressure adjusting chamber and the electromagnetic force load the valve body in a closing direction towards the valve seat, and
wherein a pressure at the passage connected to the discharge chamber loads the valve body in an opening direction.

13 more elements

A compression volume control apparatus for a refrigeration cycle, comprising:

a variable displacement refrigerant compressor having a suction chamber;
a low-pressure refrigerant pipe connected to the variable displacement refrigerant compressor;
a high-pressure refrigerant pipe;
a refrigerant discharge chamber connected to the high-pressure refrigerant pipe;
a pressure adjusting chamber;
a valve seat provided between a passage connected to the pressure adjusting chamber and a separated passage connected to the suction chamber;
and
an electromagnetic control valve including a valve body loaded by electromagnetic force towards the valve seat provided in flow connection between the separated passages connected to regions having differing pressure states,
wherein a refrigerant discharge volume is variable by varying pressure in the pressure adjusting chamber,
wherein the valve body co-acts with the valve seat to maintain a predetermined differential pressure at a substantially predetermined differential pressure value in proportion to the electromagnetic force,
wherein the predetermined differential pressure value is variable by varying the electromagnetic force of the electromagnetic control valve,
wherein the valve body faces the valve seat at the side of the separated passages,
wherein the valve body has an axial piston rod extending from the passage connected to the pressure adjusting chamber into a further separated passage connected to the discharge chamber,
wherein pressure at the passage connected to the crank chamber is pressure balanced at the valve body and the piston rod,
wherein the pressure at the passage connected to the suction chamber and electromagnetic force both load the valve body in a closing direction towards the valve seat, and
wherein the pressure at the passage connected to the discharge chamber loads the valve body in an opening direction.

13 more elements

Dependencies are inferred from the claim text.