JPS61197774A - Valve plate for coolant compressor - Google Patents

Abstract

PURPOSE:To improve the compression efficiency of a compressor by preventing the generation of a dead clearance by accommodating a suction valve into a valve plate. CONSTITUTION:A valve plate 30 equipped with a suction port 35 and a discharge port 36 corresponding to each cylinder of a cylinder block 11 having a plurality of parallel cylinders on a same circumference is arranged. A groove 1 which has a nearly same shape to that of a suction valve 38 and a nearly equal thickness to that of the suction valve 38 is formed in correspondence with each suction port 35 on the edge surface on the piston side of the valve plate 30. When a pump is in compression cycle, said suction valve 38 can be accommodated into the groove 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a refrigerant compressor having a cylinder block provided with a plurality of cylinders and a piston that reciprocates within these cylinders, in particular a cylinder side end face of a valve plate. This relates to the mounting structure of the suction valve installed in the.

[Conventional technology]

As shown in FIG. 5, for example, a conventionally known refrigerant compressor has a crank chamber 13, which also serves as a storage chamber for lubricating oil, formed between a cylinder block 11 and a front housing 12 fixed to one end thereof.

The rotor 14 is arranged within this crank chamber I3.

A thrust needle bearing 1 is fixed to a main shaft 16 which is rotatably inserted into the center of the front housing 12 via a bearing 15.
They are facing each other via 7.

Also inside the crank chamber 13. Inclined surface 14a of rotor 14
A ring-shaped swing plate 19 is disposed opposite to each other via a thrust needle bearing 18.

The swing plate 19 is swingably received at the tip of the swing center shaft via a steel ball 21 that can rotate nine times. The swinging center shaft member is fitted into the center hole A of the cylinder block 11, and is movable in the axial direction but is prevented from rotating. is being energized towards. Further, the swinging center shaft body I has a gate gear 20b at its tip, and this bevel gear 20b is attached to the swinging plate 19.
By meshing separately with the bevel gears fixed to the rocking plate 19
It prevents the rotation of.

Furthermore, a plurality of cylinders 5 are formed in the cylinder block 11, and a piston 3 is slidably inserted into each of the cylinders 5. These pistons are connected to the vicinity of the periphery of the swing plate 19 by rods. The connection between the rod n and the rocking plate 19 and the connection between the rod 4 and the piston are achieved by connecting the cylinder head 31 to the bolt 32 through a valve plate (9) having a ball joint with a gasket 4 and 4'. Fixed by The cylinder head 31 has a suction chamber 33 near the outer periphery and a discharge chamber M in the center. The valve plate 30 has a suction port that connects the cylinder 26 to the suction chamber, and a discharge port that connects each of the cylinders to the discharge room temperature, and is integrally fixed to the cylinder block 11 with a fixing bolt 32. has been done.

The thin plate gasket 29/4' has an opening in the cylinder portion (intake port and discharge port).

Facing this opening, cylinder A, suction chamber O, and discharge port U
The suction port and discharge port are opened by swinging by the internal pressure.
Between the suction valve and the discharge valve 39 to be closed is the valve plate (9)
are mounted on top of each other.

A valve holder 40 prevents excessive deflection of the discharge valve 39, and is integrally fixed to the valve plate (9) by a fixing bolt 37.

[Problem that the invention seeks to solve]

In the conventional refrigerant compressor, as described above, the suction valve gap and the discharge valve 39 are fixed to overlap with the valve plate (9).

For this reason, especially during compression (when the suction port is closed), the area between the suction valves is completely affected by the volume change due to the reciprocating movement of the screws and screws between the valve plate I and the piston rear, as shown in Figure 10. This results in the formation of a dead clearance D that is not equal to 1, which causes a reduction in the compression efficiency of the compressor.

[Failure to solve the problem]

This invention has been made in order to solve the above-mentioned problem Q, and is provided with a suction valve having approximately the same shape and a depth approximately equal to the thickness of the suction valve, corresponding to each suction port on the end surface of the valve plate 30 on the piston side. A notch is provided, and the suction valve is accommodated in this notch during compression to prevent the occurrence of dead clearance D and improve compression efficiency.

〔Example〕

The following will explain the embodiments shown in the drawings.

9. In this embodiment, the refrigerant pressurizer itself is constructed.

The piston of the valve plate 30 has a notch hole 1 on the side end surface which is approximately the same shape as the star-shaped suction valve or slightly larger and has a depth approximately equal to the thickness of the suction valve. A colloquial and ejection port is provided.

Then, make sure that the suction valve on the side of the pulp rate piston matches the notch hole 1.

A discharge valve cover and a valve holder 40 are integrally fixed to the piston head 31 side of the valve plate I by a fixing port 37. Reference numeral 41 is a long and large suction valve provided at a position corresponding to the discharge port I, and is for allowing the refrigerant in the cylinder δ to be discharged into the discharge chamber when the suction valve 38 is closed during compression. 42 is a hole for positioning the valve plate, the cylinder block 11, and the cylinder head 31.

〔Effect of the invention〕

According to this invention, since the suction valve is housed in the notch hole provided in the valve plate when the piston is compressed, the dead clearance D between the piston and the valve plate can be minimized.

It is possible to improve the compression efficiency of the refrigerant compressor.

[Brief explanation of drawings]

Fig. 1 is a front view of the valve plate part on the cylinder side of the invention, Fig. 2 is a front view of the valve plate part on the cylinder head side, Fig. 3 is a side sectional view of the valve plate part, and Fig. 4 is a front view of the valve plate part on the cylinder head side of the invention. FIG. 5 is an enlarged cross-sectional view showing the relationship between the piston and the valve plate in the compressed state, and FIG. 5 is a cross-sectional view of a known refrigerant compressor. FIG. 6 is a front view of a conventional valve plate portion on the cylinder side, FIG. 7 is a front view of the valve plate portion on the cylinder head side, and FIG. 8 is a side sectional view of the same valve plate portion.
FIG. 9 is an enlarged sectional view showing the relationship between the piston and the valve plate in the same compressed state, and FIG. 10 is a partially enlarged front view of the same suction valve and gasket. 1: Notch hole 11 Niji cylinder block 25 Niji cylinder 26: Pist / 4/4': Gasket 30: Valve plate 31 Niji cylinder head 35 = Suction port 36: Discharge port 38 = Suction valve Figure 1 procedure supplement/overwriting (self-initiated) - Showa z0 year 2/day

Claims (1)

[Claims] 1. Multiple cylinders (25) parallel to each other on the same circumference
a cylinder block (11) provided with a cylinder block (11);
5) a piston (26) fitted into the piston so as to be able to reciprocate;
The cylinder block (11) and the cylinder head (31)
) through thin plate gaskets (29, 29') having openings in the cylinder part, and an inlet (35) and an outlet (36) corresponding to each cylinder (25).
), the valve plate (30) is provided with a piston (2).
6) Suction valves (
A valve plate for a refrigerant compressor, characterized in that it has a groove (1) that is approximately the same shape as 38) and has a depth that is approximately equal to the thickness of the suction valve (38), so that the suction valve (38) can be accommodated during compression. .