Hermetic compressor

1. A hermetic compressor comprising:

a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber;

a piston reciprocating in the compression chamber;

a valve plate arranged at an open end of the compression chamber, the valve plate including a suction hole formed therein;

a suction valve opening and closing the suction hole;

a suction muffler forming a sound absorbing space and provided with a communication pipe;

a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber;

the communication pipe has a suction muffler outlet portion communicating with the suction hole, the suction muffler outlet portion is arranged to extend in a vertical direction to a center line passing through the suction hole, the suction muffler outlet portion including an edge that defines an outlet and that faces the compression chamber, and a part of the edge of the suction muffler outlet portion positioned at a downstream side of refrigerant gas that is flowing through the communication pipe overlaps a part of the suction hole in a state in which the suction muffler outlet portion is projected in a direction of the center line passing through the suction hole;

a gasket is sandwiched between the valve plate and the suction muffler with the edge of the suction muffler portion abutting against the gasket, the gasket is provided with a communication hole which is opposed to both of the suction hole and the outlet of the suction muffler outlet portion and communicates with the suction hole and the suction muffler outlet portion, a center of the communication hole is located at an upstream side of the refrigerant gas flow path, a cross sectional area of the communication hole is larger than a cross sectional area of the suction hole, and an entire region of the communication hole is communicated with the suction muffler outlet portion; and

wherein a maximum dimension in a radial direction of the suction hole overlapped by the part of the edge of the suction muffler outlet portion is in a range of being equal to or more than 5% and equal to or less than 20% of an inner diameter of the cylindrical portion of the suction hole, in a projection in the direction of the center line passing through the suction hole.

2. The hermetic compressor according to claim 1 , wherein the refrigerant gas flow path through the valve plate comprises a suction flow path guiding the refrigerant gas toward the suction hole, and the suction flow path includes a guide portion that guides flow into the suction hole at an end of the valve plate that faces the suction muffler outlet portion.

3. The hermetic compressor according to claim 2 , wherein the guide portion is communicated with the suction muffler outlet portion, and the guide portion is provided in the suction hole at the upstream side of the refrigerant gas flow path, in a projection in the direction of the center line passing through the suction hole.

4. A hermetic compressor comprising:

a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber;

a piston reciprocating in the compression chamber;

a valve plate arranged at an open end of the compression chamber, the valve plate including a suction hole formed therein;

a suction valve opening and closing the suction hole;

a suction muffler forming a sound absorbing space and provided with a communication pipe;

a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber;

the communication pipe has a suction muffler outlet portion communicating with the suction hole, the suction muffler outlet portion is arranged to extend in a vertical direction to a center line passing through the suction hole, the suction muffler outlet portion including an edge that defines an outlet and that faces the compression chamber, and a part of the edge of the suction muffler outlet portion positioned at a downstream side of refrigerant gas that is flowing through the communication pipe overlaps a part of the suction hole in a state in which the suction muffler outlet portion is projected in a direction of the center line passing through the suction hole;

a gasket is sandwiched between the valve plate and the suction muffler with the edge of the suction muffler portion abutting against the gasket, the gasket is provided with a communication hole which is opposed to both of the suction hole and the outlet of the suction muffler outlet portion and communicates with the suction hole and the suction muffler outlet portion, a center of the communication hole is located at an upstream side of the refrigerant gas flow path, a cross sectional area of the communication hole is larger than a cross sectional area of the suction hole, and an entire region of the communication hole is communicated with the suction muffler outlet portion; and

a cross sectional area of the suction hole overlapped by the part of the edge of the suction muffler outlet portion is in a range of being equal to or more than 10% and equal to or less than 20% of a cross sectional area of a cylindrical portion of the suction hole, in a projection in the direction of the center line passing through the suction hole.

5. A hermetic compressor comprising:

a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber;

a piston reciprocating in the compression chamber;

a valve plate arranged in an opening end of the compression chamber, the valve plate including a suction hole formed therein;

a suction valve opening and closing the suction hole;

a suction muffler forming a sound absorbing space and provided with a communication pipe; and

a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber, wherein

the communication pipe has a suction muffler outlet portion communicating with the suction hole, and is arranged to extend in a vertical direction to a center line passing through the suction hole, and a part of the suction muffler outlet portion positioned in a downstream side of refrigerant gas that is flowing through the communication pipe covers a part of the suction hole in a state in which the suction muffler outlet portion is projected in a direction of the center line passing through the suction hole,

wherein a gasket is arranged between the valve plate and the suction muffler, the gasket is provided with a communication hole which is opposed to both of the suction hole and the suction muffler outlet portion and communicates with the suction hole and the suction muffler outlet portion, a center of the communication hole is located at an upstream side of the refrigerant gas flow path, a cross sectional area of the communication hole is larger than a cross sectional area of the suction hole, and an entire region of the communication hole is communicated with the suction muffler outlet portion; and

a maximum dimension in a radial direction of the suction hole covered by the part of the suction muffler outlet portion is in a range of being equal to or more than 5% and equal to or less than 20% of an inner diameter of the cylindrical portion of the suction hole, in a projection in the direction of the center line.

6. A hermetic compressor comprising:

a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber;

a piston reciprocating in the compression chamber;

a valve plate arranged in an opening end of the compression chamber, the valve plate including a suction hole formed therein;

a suction valve opening and closing the suction hole;

a suction muffler forming a sound absorbing space and provided with a communication pipe; and

a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber, wherein

the communication pipe has a suction muffler outlet portion communicating with the suction hole, and is arranged to extend in a vertical direction to a center line passing through the suction hole, and a part of the suction muffler outlet portion positioned in a downstream side of refrigerant gas that is flowing through the communication pipe covers a part of the suction hole in a state in which the suction muffler outlet portion is projected in a direction of the center line passing through the suction hole,

wherein a gasket is arranged between the valve plate and the suction muffler, the gasket is provided with a communication hole which is opposed to both of the suction hole and the suction muffler outlet portion and communicates with the suction hole and the suction muffler outlet portion, a center of the communication hole is located at an upstream side of the refrigerant gas flow path, a cross sectional area of the communication hole is larger than a cross sectional area of the suction hole, and an entire region of the communication hole is communicated with the suction muffler outlet portion; and

a cross sectional area of the suction hole covered by the part of the suction muffler outlet portion is in a range of being equal to or more than 10% and equal to or less than 20% of a cross sectional area of a cylindrical portion of the suction hole, in a projection in the direction of the center line passing through the suction hole.

7. The hermetic compressor according to claim 1 , wherein the communication hole is formed so that the cross sectional area communicating with the suction muffler outlet portion is maximized.

8. The hermetic compressor according to claim 1 , wherein the refrigerant gas flow path through the valve plate comprises a suction flow path guiding the refrigerant gas toward the suction hole, and the suction flow path includes a guide portion heading for the suction hole from an end surface close to the suction muffler outlet portion.

9. The hermetic compressor according to claim 8 , wherein the guide portion is communicated with the suction muffler outlet portion, and is provided in the suction hole at the upstream side of the refrigerant gas flow path, in a projection in the direction of the center line passing through the suction hole.