JPH05133335A - Closed type compressor - Google Patents

Abstract

PURPOSE:To provide a stopper of a delivery reed for displaying multiple functions with a simple part for the sake of a compressor of good energy efficiency by arranging the delivery reed of almost C-shaped section in a circular arc-shaped recessed part of a valve plate. CONSTITUTION:A delivery reed 35 is arranged in a circular arc-shaped long recessed part 32 of a valve plate and assembled by screwing a screw 41 of a stopper 40 to a screw part 53 of a reed holder 42. When the reed holder 42 is set to the valve plate 20, an opposite delivery hole side 34 of the delivery reed is mounted by one end of the stopper 40, and the other end serves as a stopper 41a of the delivery reed for restricting excessive movement of the delivery reed 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The hermetic compressor according to the present invention is
It is suitable for use as a refrigerant compressor for cooling systems such as refrigerators and freezers.

[0002]

2. Description of the Related Art In recent years, reciprocating hermetic compressors used in cooling systems such as refrigerators and freezers have been required to have improved compression efficiency.

In this conventional hermetic compressor, the volume of the discharge hole formed in the valve plate is reduced to improve the compression efficiency, and the reed valve is positioned above the discharge hole of the valve plate. US Pat. No. 4,723 has a structure in which a support spring, a valve stopper, and a holding spring are provided on the top to temporarily fix them, and when the cylinder head is attached to the cylinder block, the holding spring is pressed to fix them.
896.

[0004]

However, in the above-mentioned conventional configuration, the reed valve that closes the discharge hole and the spring reed that biases the reed valve in the closing direction are set so as to operate normally. There was a problem that it could not be tested by itself.

Further, in a model having a large cylinder volume, if there is only one discharge hole, overcompression loss increases, and compression efficiency is rarely reduced. This over-compression loss means that the discharge reed valve opens when the high pressure in the cylinder reaches the high pressure and exceeds the high pressure in a small range, but it indicates the loss caused by a slight pressure difference from this high pressure. is there.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a hermetic compressor capable of individually testing the mounting state of a reed valve.

[0007]

In order to solve the above problems, a recess is formed in a valve plate, two discharge holes are formed in this recess, and each discharge is formed in this recess. A discharge lead having a substantially C-shaped cross section for independently closing the holes is provided by urging in the direction of closing the two discharge holes.

[0008]

Operation: The retention of the refrigerant gas in the discharge hole of the valve plate is minimized to improve the compression efficiency, and the substantially C-shaped discharge lead is urged in the direction of closing the discharge hole without using a separate spring. Can respond at high speed. In addition, 2 discharge leads
Discharge leads are provided for each to prevent overcompression loss.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor according to an embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same parts as the conventional ones are denoted by the same reference numerals and the description thereof will be omitted.

In order to describe the present invention in more detail, it will be described below with reference to the accompanying drawings. Reference numeral 1 is a closed case in which the upper case 1a is fitted to the peripheral edge of the lower case 1b and the joint portion is welded. A motor unit 2 as a drive source and a compression unit 3 for compressing the refrigerant gas are elastically supported in the closed case 1.

The motor unit 2 includes a stator 4 and
Rotor 5 and crankshaft 6 fitted to rotor 5
It consists of

The compression unit 3 is located below the motor unit 2 and includes a cylinder block 9 having a cylinder 8 having an open end 7 and a support 10 for supporting a crankshaft 6 of the motor unit 2. It is fixed with screws N. Then, in order to reciprocate the piston 11 housed in the cylinder 8, the piston 11 and the crank portion 12 of the crankshaft 6 are connected by the connecting rod 13.

Reference numeral 19 denotes an oil supply pipe attached to the lower end of the crankshaft 6 for supplying the lubricating oil accumulated at the bottom of the lower case 1b to the mechanical portion by the rotation of the crankshaft 6.

Further, the cylinder block 9 of the compression unit 3 elastically supports the support pin 14 and the fixed pin 15 fixed to the lower case 1b of the closed case 1 via the compression spring 16.

Reference numeral 17 denotes a power supply terminal provided in the lower case 1b, which is a stator 4 of the motor unit 2.
And a lead wire 18 for connection.

Reference numeral 20 is a valve plate for closing the open end 7 of the cylinder 8 of the cylinder block 9. In this valve plate 20, a plate gasket 21 and a suction lead 22 are located on the open end 7 side, a head gasket 23 and a cylinder head 24 are located on the side opposite to the open end 7, and four corners are fixed with screws NA.

A suction plenum 25 and a discharge plenum 26 are formed on the cylinder head 24 on the valve plate 20 side. A suction muffler 27 made of synthetic resin is connected to the suction plenum 25. The suction muffler 27 is connected to the suction side of the cooling system outside the closed case 1.

The valve plate 20 facing the suction plenum 25 is formed with a suction hole 28 penetrating into the cylinder 8. Further, the valve plate 20 facing the discharge plenum 26 is formed with two discharge holes 29 penetrating to the cylinder 8.

The suction lead 22 is formed of a flat plate,
The periphery is removed so that the suction valve portion 30 remains, and holes 31 through which the screws NA pass are formed at the four corners.

The piston 11 of the valve plate 20
A long arc-shaped recess 32 is formed on the side opposite to. Two discharge holes 29 are located in the most recessed portion of the recess 32, and the surfaces of the discharge hole 29 and the recess 32 are subjected to polishing processing to be finished neatly.

Reference numeral 35 is a discharge lead made of a hardened steel having a thickness of about 0.2 mm and having a substantially C-shaped cross section.
One end of the C-shape is formed into a bifurcated shape, and each discharge hole 29 of the valve plate 20 is pressed by the elastic force of the C-shaped steel to close the C-shape.
The other end of the shape is located on the side opposite to the discharge hole. A through hole 52 is provided on the side opposite to the discharge hole, and the screw 41 of the stopper 40 is provided.
The screw 41 is screwed into the threaded portion 53 of the lead holder for assembly. Reference numeral 55 is a flat surface for a spanner. Further, the distance between the C-shaped ends of the discharge leads 35 is formed longer than the length of the stopper 40.

Reference numeral 42 denotes a lead holder which is formed integrally with the leg portion 45 of the lead holder and is formed along the C-shape of the discharge lead 35. A through hole 54 is provided in the leg portion 45 of the lead holder, and a through hole 50 of the valve plate 20 is fixed to the through hole 54 through a rivet 48.

When the rivet 48 is fixed, the discharge hole 29 of the valve plate 20 and the center of the C-shaped bend of the discharge lead 35 are aligned with each other, and the discharge lead 35 is deformed by being pressed and the discharge hole 29 is discharged. Blocked by 35.

Long recess 3 in which this rivet is mounted
A counterbore portion 49 is formed on the valve plate 20 on the side opposite to 2, so that the rivet 48 does not travel.

Reference numeral 51 is a hole through which the screws NA formed at the four corners of the valve plate 20 pass. In such a structure, the refrigerant gas returned from the cooling system is sucked into the suction plenum 2 of the cylinder head 24 via the suction muffler 27.
Guided to 5. Then, according to the movement of the piston 11, the intake valve unit 30 opens the intake valve unit 30 to intake the air into the cylinder 8. When the piston 11 approaches the valve plate 20 side, the compressed refrigerant gas passes through the discharge hole 29 of the valve plate 20, pushes the discharge lead 35 away, and discharges it to the discharge plenum 26 of the cylinder head 24. , Through a communication pipe (not shown) to the cooling system.

Therefore, since the discharge lead 35, the stopper 40, and the lead holder 42 can be attached to the valve plate 20 to check the operation of the discharge lead 35, a predetermined capacity as a compressor can be maintained.

Further, by forming the discharge hole 29 in the recess 32 of the valve plate 20 and making the height thereof thinner than the thickness of the valve plate 20, the refrigerant gas staying in this space can be wasted, so that the compression efficiency is improved. Can be increased.

As an example, in the case of a compressor having a cylinder volume of 7.7 cm ³ , the thin portion of the recess 32 of the valve plate 20 is flat because the thinnest portion of the conventional product is flat. It was 1.5 mm.

In the present invention, the long recess 32 is an arc-shaped, spherical surface, and since it is reinforced by making it a spherical surface, the thinnest portion can be configured to be about 1 mm. Therefore, the refrigerant gas staying in the space of the discharge hole is reduced by about 30%, so that the compression efficiency can be remarkably enhanced.

Further, since there are a plurality of discharge holes 29, an increase in over-compression loss can be prevented, and since discharge leads are provided in each discharge hole 29, the surface of the discharge holes is shown in FIG. Even if a large step H occurs, the ejection leads 35 are bifurcated and can be reliably sealed.

Further, as described above, by fixing the rivet, the centers of the C-shaped bends of the discharge hole and the discharge lead are aligned,
Further, the ejection hole is blocked by the rigidity and is blocked by the ejection lead. Therefore, the C-shape can be used as a substitute for the support spring that has been used in the past, and the support spring is not required, so that the structure can be simplified.

[0032]

As described above, according to the present invention, a closed case, a cylinder block having a cylinder elastically mounted in the case and having an open end, a piston in the cylinder, and a cylinder block mounted on the cylinder block. A motor that reciprocates the piston in the cylinder, a valve plate fixed to the cylinder block at the open end, a long recess formed on the valve plate on the side facing the piston, and into the recess. A pair of discharge holes formed in the valve plate to be opened, a discharge lead disposed in the recess and functioning to seal the discharge hole,
A lead holder that presses the opposite side of the discharge lead from the discharge lead, a columnar stopper that fixes the discharge lead to the lead holder, a leg portion that is integral with the lead holder that fixes the lead holder to the valve plate, and the discharge lead, It consists of a cylinder head with a discharge plenum that covers the lead holder, stopper, and recess. The discharge lead is made of thin hardened steel.
The cross-section is formed in a substantially C shape, one end of the C shape is fixed to the discharge lead holder, the other end presses and closes the discharge hole of the valve plate, and one end of the columnar stopper fixes the discharge lead to the holder with a screw. Since the other end serves as a stopper for the ejection lead, the stopper fixes the ejection lead to the lead holder and regulates the operation of the ejection lead, which serves multiple functions with one component and simplifies the configuration. Further, the sealability can be tested with the discharge lead attached to the valve plate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hermetic compressor according to the present invention.

FIG. 2 is a vertical cross-sectional view of the compression unit portion of FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view showing a valve closed state by the discharge lead of the present invention.

FIG. 5 is an exploded perspective view of the valve plate of the present invention.

[Explanation of symbols]

 1 Sealed Case 2 Motor 8 Cylinder 9 Cylinder Block 11 Piston 20 Valve Plate 24 Cylinder Head 26 Discharge Plenum 29 Discharge Hole 32 Long Recess 34 Discharge Lead Anti-Discharge Hole Side 35 Discharge Lead 40 Stopper 41 Stopper Screw 41a Discharge Lead Stopper 42 Lead Holder 45 Lead Holder Leg

Claims (1)

[Claims] 1. A closed case, a cylinder block having a cylinder elastically mounted in the case and having an open end, a piston in the cylinder, and the piston in the cylinder mounted on the cylinder block. A reciprocating motor, a valve plate fixed to the cylinder block at the open end, a long recess formed in the valve plate on the side facing the piston, and the valve plate opening into the recess. A pair of discharge holes, a discharge lead disposed in the recess for sealing the discharge hole, a lead holder for pressing the discharge lead on the side opposite to the discharge hole, and a columnar stopper for fixing the discharge lead to the lead holder, The legs that are integrated with the lead holder that secures the lead holder to the valve plate, the discharge lead, and the lead holder. A cylinder head having a rudder, a stopper, and a discharge plenum that covers the recess, and one end of the stopper is fixed to the lead holder with a screw and the other end serves as a stopper for the discharge lead. Closed type compressor.