Method of Processing Contact Portions between Valve Plate and Suction Valve and/or Discharge Valve of Reciprocating Compressor, and Reciprocating Compressor

A method for processing contact portions between a valve plate and a suction valve and/or discharge valve of a reciprocating compressor to prevent the suction valve and/or the discharge valve from sticking on the valve plate at the portions contacting the valve plate, wherein the compressor comprises a cylinder bore, a piston fitted in the cylinder bore to be capable of reciprocal movement, a valve plate provided with a suction hole and a discharge hole communicating with the cylinder bore, a strap-shaped suction valve for opening and closing the suction hole, a strap-shaped discharge valve for opening and closing the discharge hole, a suction chamber communicating with the cylinder bore through the suction hole and the suction valve, and a discharge chamber communicating with the cylinder bore through the discharge valve and the discharge hole, and wherein the method comprises the steps of quenching the portion of the end face of the suction valve contacting the valve plate opposing the portion of the valve plate near the suction hole and/or the portion of the end face of the discharge valve contacting the valve plate opposing the portion of the valve plate near the discharge hole by laser beam machining without melting them, and grinding the end face of the suction valve and/or the end face of the discharge valve to project the quenched portions from the remaining unquenched portions.

A method for processing contact portions between a valve plate and a suction valve and/or discharge valve of a reciprocating compressor to prevent the suction valve and/or the discharge valve from sticking on the valve plate at the portions contacting the valve plate, wherein the compressor comprises cylinder bores, pistons fitted in the cylinder bores to be capable of reciprocal movement, a valve plate provided with suction holes and discharge holes communicating with the cylinder bores, strap-shaped suction valves for opening and closing the suction holes, strap-shaped discharge valves for opening and closing the discharge holes, a suction chamber communicating with the cylinder bores through the suction holes and the suction valves, and a discharge chamber communicating with the cylinder bores through the discharge valves and the discharge holes, and wherein the cylinder bores are circumferentially distanced from each other and located on the circumference of a first circle, the suction holes are circumferentially distanced from each other and located on the circumference of a second circle, and the discharge holes are circumferentially distanced from each other and located on the circumference of a third circle, and wherein the method comprises the steps of quenching the end face of the valve plate contacting the suction valves at an intermittent annular portion crossing all of the suction holes and/or the end face of the valve plate contacting the discharge valves at an intermittent annular portion crossing all of the discharge holes by laser beam machining without melting them, and grinding the end face of the valve plate contacting the suction valves and/or the end face of the valve plate contacting the discharge valves to project the quenched portions from the remaining unquenched portions.

A method for processing contact portions between a valve plate and a suction valve and/or discharge valve of a reciprocating compressor to prevent the suction valve and/or the discharge valve from sticking on the valve plate at the portions contacting the valve plate, wherein the compressor comprises cylinder bores, pistons fitted in the cylinder bores to be capable of reciprocal movement, a valve plate provided with suction holes and discharge holes communicating with the cylinder bores, strap-shaped suction valves for opening and closing the suction holes, strap-shaped discharge valves for opening and closing the discharge holes, a suction chamber communicating with the cylinder bores through the suction holes and the suction valves, and a discharge chamber communicating with the cylinder bores through the discharge valves and the discharge holes, and wherein the cylinder bores are circumferentially distanced from each other and located on the circumference of a first circle, the suction holes are circumferentially distanced from each other and located on the circumference of a second circle, and the discharge holes are circumferentially distanced from each other and located on the circumference of a third circle, and wherein the method comprises the step of making any one of a resin coat, plated metal coat, thermal sprayed material coat, sintered metal coat and ceramic coat on the end face of the valve plate contacting the suction valves at an intermittent annular portion crossing all of the suction holes and/or the end face of the valve plate contacting the discharge valves at an intermittent annular portion crossing all of the discharge holes to project the coated portions from the remaining uncoated portions.

A method for processing contact portions between a valve plate and a suction valve and/or discharge valve of a reciprocating compressor to prevent the suction valve and/or the discharge valve from sticking on the valve plate at the portions contacting the valve plate, wherein the compressor comprises cylinder bores, pistons fitted in the cylinder bores to be capable of reciprocal movement, a valve plate provided with suction holes and discharge holes communicating with the cylinder bores, strap-shaped suction valves for opening and closing the suction holes, strap-shaped discharge valves for opening and closing the discharge holes, a suction chamber communicating with the cylinder bores through the suction holes and the suction valves, and a discharge chamber communicating with the cylinder bores through the discharge valves and the discharge holes, and wherein the cylinder bores are circumferentially distanced from each other and located on the circumference of a first circle, the suction holes are circumferentially distanced from each other and located on the circumference of a second circle, and the discharge holes are circumferentially distanced from each other and located on the circumference of a third circle, and wherein the method comprises the steps of quenching the end face of the valve plate contacting the suction valves at a continuous annular portion close to an of the suction holes and/or the end face of the valve plate contacting the discharge valves at a continuous annular portion close to all of the discharge holes by laser beam machining without melting them, and grinding the end face of the valve plate contacting the suction valves and/or the end face of the valve plate contacting the discharge valves to project the quenched portions from the remaining unquenched portions.

A method for processing contact portions between a valve plate and a suction valve and/or discharge valve of a reciprocating compressor to prevent the suction valve and/or the discharge valve from sticking on the valve plate at the portions contacting the valve plate, wherein the compressor comprises cylinder bores, pistons fitted in the cylinder bores to be capable of reciprocal movement, a valve plate provided with suction holes and discharge holes communicating with the cylinder bores, strap-shaped suction valves for opening and closing the suction holes, strap-shaped discharge valves for opening and closing the discharge holes, a suction chamber communicating with the cylinder bores through the suction holes and the suction valves, and a discharge chamber communicating with the cylinder bores through the discharge valves and the discharge holes, and wherein the cylinder bores are circumferentially distanced from each other and located on the circumference of a first circle, the suction holes are circumferentially distanced from each other and located on the circumference of a second circle, and the discharge holes are circumferentially distanced from each other and located on the circumference of a third circle, and wherein the method comprises the step of making any one of a resin coat, plated metal coat, thermal sprayed material coat, sintered metal coat and ceramic coat on the end face of the valve plate contacting the suction valves at a continuous annular portion close to all of the suction holes and/or the end face of the valve plate contacting the discharge valves at a continuous annular portion close to all of the discharge holes to project the coated portions from the remaining uncoated portions.