JP4821077B2 - Compressor discharge valve mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compressor that generates a compressed gas by reciprocally driving a piston with an electric motor, and more particularly to a discharge valve mechanism that compresses gas sucked into a cylinder and discharges the gas from the cylinder through a discharge valve. .
[0002]
[Prior art]
In general, a compression mechanism of a gas compressor compresses gas sucked into a cylinder containing a piston driven by a motor and discharges the gas from the cylinder and stores it in an air tank or supplies it to a subsequent compression mechanism. I am doing so. An air supply chamber and a discharge chamber are formed between a valve seat plate disposed at the upper end of the cylinder and a cylinder head disposed on the upper surface of the valve seat plate. The valve seat plate has an intake air communicating between the cylinder and the air supply chamber. A discharge port that allows communication between the port, the inside of the cylinder, and the discharge chamber is perforated. A thin plate-like intake valve and a discharge valve are respectively arranged at the intake port and the discharge port. On the upper surface side of the discharge valve, that is, in the discharge chamber, a valve presser for restricting the opening amount when the discharge valve is deformed by the discharge gas pressure is arranged so that the base side is overlapped with the discharge valve. As shown, the distal end side of the valve presser 100 is shaped to be separated from the upper surface of the valve seat plate 102 in a curved shape with a constant curvature in accordance with the opening displacement amount of the discharge valve 101.
[0003]
By the way, in a compressor in which the capacity of the compressor is increased to increase the discharge amount, the discharge amount discharged into the discharge chamber of the compressed gas compressed in the cylinder increases, so the displacement amount of the discharge valve is increased. It is necessary to set a large opening amount through which the compressed gas flows. Therefore, the shape of the valve presser 100 is curved with a large radius of curvature r1 as shown by the solid line in FIG. 6, and the height position of the tip is a height h at which a predetermined opening amount is obtained from the upper surface of the valve seat plate 102. In this way, the discharge valve 101 is greatly deformed to increase the opening amount.
[0004]
[Problems to be solved by the invention]
However, as shown in FIG. 7, the discharge valve 101 that is displaced by the high discharge gas pressure is greatly displaced at the distal end side of the discharge valve 101 and hits the valve presser 100, and then the entire discharge valve 101 follows the valve presser 100. The phenomenon of displacement occurs. For this reason, the tip of the discharge valve 101 repeatedly collides with the valve presser 100, and the tip part is worn or damaged by sliding contact with the valve presser surface, which causes a problem in durability of the discharge valve. It was.
[0005]
The present invention solves the above-mentioned problems of the prior art, and even when the discharge capacity is increased, the conventional discharge valve can be used as it is, the discharge valve does not break due to impact or wear, and high durability It is an object of the present invention to provide a discharge valve mechanism for a gas compressor from which the above can be obtained.
[0006]
[Means for Solving the Problems]
To solve the above problems, the discharge valve mechanism of the gas compressor according to the present invention compresses the air sucked through the suction valve by the respective pistons are reciprocated within the cylinder, the compressed air through a discharge valve in the compressor having a compression mechanism of the two front and rear stages to exhaust out, and thin plate-like discharge valves for opening and closing the discharge port formed in the valve seat plate disposed between the cylinder and the cylinder head which constitute the succeeding stage of the compression mechanism, The valve presser is arranged above the discharge valve and regulates the amount of displacement of the discharge valve, and the shape of the contact surface with the discharge valve of the valve presser is formed by increasing the curvature of the tip part and deflecting upward. The tip of the discharge valve does not contact the valve retainer.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an air compressor 1 in which a discharge valve mechanism according to the present invention is implemented. This compressor 1 includes two compression mechanisms 3, 4 constituted by a piston / cylinder mechanism operated by a common electric motor 2. It is comprised as a two-stage compressor provided with. The first-stage compression mechanism 3 compresses and discharges atmospheric pressure air, supplies the first-stage discharge air to the second-stage compression mechanism 4 via the connecting pipe 5, and the second-stage compression mechanism 4 further supplies the compressed air. The high pressure air is compressed and discharged and stored in the air tank 6. The electric motor 2 and the compression mechanisms 3 and 4 are installed on two air tanks 6 connected to each other.
[0008]
As shown in FIG. 2, the rotation output shaft 8 of the electric motor 2 supported by the motor housing 7 protrudes from both ends of the motor housing 7, and the eccentric disks 9, 10 is fixed. The eccentric discs 9 and 10 at both ends of the rotation output shaft 8 are attached so that the phases are different from each other by 180 degrees. Eccentric disks 9, 10 in which pistons 13 and 14 accommodated in cylinders 11 and 12 constituting the compression mechanisms 3 and 4 are fixed to end portions of the output shaft 8 via piston rods 15 and 16, respectively. The compression mechanisms 3 and 4 are arranged separately on both sides of the electric motor 2.
[0009]
Valve seat plates 17 and 18 are disposed at the upper ends of the cylinders 11 and 12 forming the compression mechanisms 3 and 4, respectively, and cylinder heads 19 and 20 are disposed on the upper surfaces of the valve seat plates 17 and 18. The intake chambers 21 and 22 and the discharge chambers 23 and 24 are formed between the valve seat plates 17 and 18 and the cylinder heads 19 and 20. The intake ports 25 and 26 and the discharge ports 27 and 28 are formed, and the intake chambers 21 and 22 and the discharge chambers 23 and 24 are respectively connected to the cylinders 11 and 24 via the intake ports 25 and 26 and the discharge ports 27 and 28. 12 communicates with the inside. The intake valves 29 and 30 for opening and closing the intake ports 25 and 26 are provided on the cylinder 11 and 12 side of the valve seat plates 17 and 18, and the discharge ports are provided on the discharge chambers 23 and 24 side of the valve seat plates 17 and 18. Discharge valves 31 and 32 for opening and closing the valves 27 and 28 are attached to be freely opened and closed. Furthermore, valve pressers 33 and 34 for restricting the opening amounts of the respective discharge valves are arranged above the discharge valves 31 and 32. The front discharge chamber 23 is connected to the rear intake chamber 22 via the connecting pipe 5, and the rear discharge chamber 24 is connected to the air tank 6.
[0010]
FIG. 3 shows the configuration of the discharge unit of the compression mechanism 4 in detail. The discharge valve 32 disposed on the upper surface of the discharge port 28 of the valve seat plate 18 prevents the compressed air from flowing into the cylinder 12 from the discharge chamber 24 by closely contacting the discharge port 28 of the valve seat plate 18. Yes. When the air in the cylinder 12 is compressed and becomes higher than the pressure in the discharge chamber 24, the pressure side of the compressed air in the cylinder 12 causes the tip side to move away from the valve seat plate 18 to open the discharge port 28 and open the high-pressure compressed air. Is discharged from the cylinder 12 to the discharge chamber 24 side. The base end side 32 a of the discharge valve 32 is overlapped with the base side 34 a of the valve presser 34 for restricting the opening amount of the discharge valve 32 disposed on the upper surface side of the discharge valve 32, and the valve seat plate 18 by the screw 35. Is attached.
[0011]
As shown in FIG. 4, the tip 34b of the valve retainer 34 is formed in a curved shape so as to gradually move away from the surface of the valve seat plate 18 with a curvature having a radius r1, and the discharge valve 32 is curved in the curved shape of the valve retainer 34. And the opening amount of the tip 32b is set so as to ensure an opening amount h commensurate with the discharge amount of the compression mechanism 4. Further, the tip 34b of the valve retainer 34 is formed to be deflected away from the surface of the valve seat plate 18 with a radius r2 smaller than the radius r1.
[0012]
Next, the operating state of the discharge valve mechanism of the above embodiment will be described. By rotating the rotary output shaft 8 by operating the electric motor 2, the piston rods 15, 16 are reciprocated according to the rotation of the eccentric disks 9, 10 on both sides, and the pistons 13, 14 are connected to the cylinders 11, 12. Reciprocates inside. When the piston 13 moves downward in the compression mechanism 3 in the preceding stage, the volume in the cylinder 11 expands, so that the intake valve 29 is opened by the differential pressure between the intake chamber 25 and the inside of the cylinder 11, and gas is supplied into the cylinder 11. The At this time, the discharge valve 31 remains closed. At the same time, the piston 14 is moved upward in the compression mechanism 4 at the rear stage, and the volume in the cylinder 12 is reduced. Therefore, the discharge valve 32 is opened by the pressure difference between the inside of the cylinder 12 and the discharge chamber 24 and the inside of the cylinder 12 is compressed. The gas is discharged from the discharge port 28. At this time, the intake valve 30 remains closed. The compressed gas discharged from the discharge chamber 23 of the front-stage compression mechanism 3 is sent to the intake chamber 22 of the rear-stage compression mechanism 4 through the connecting pipe 5 and further compressed by the subsequent-stage compression mechanism 4 to be discharged from the discharge chamber. It is discharged from 24 and stored in the compressed gas storage tank 6 through the connecting pipe 5b.
[0013]
Hereinafter, a detailed operation description of the ejection mechanism, since its operation with the preceding stage of the compression mechanism and the rear stage of the compression mechanism is exactly the same convenience actuation will be described with reference to the subsequent stage of the compression mechanism. In a state where the piston 14 is operating in the direction of the bottom dead center, the discharge valve 32 is in close contact with the upper surface of the valve seat plate 18 to close the discharge port 28 as shown in FIG. During this time, air is taken into the cylinder 12 from the intake port. When the piston 14 is operated toward the top dead center, the air in the cylinder 12 is compressed to increase the pressure. When this pressure exceeds the pressure in the discharge chamber 24, the discharge valve 32 is compressed in the cylinder 12. The air is opened by the pressure of the compressed air, and the compressed air is discharged into the discharge chamber 24. At this time, the tip of the discharge valve 32 is greatly displaced upward by the compressed air that is discharged, but the tip 34b of the valve retainer 34 is formed in a shape that is deflected upward, so the tip 32b of the discharge valve 32 Therefore, the tip end portion 32b of the discharge valve 32 is not worn, and damage to the discharge valve due to this wear can be prevented.
[0014]
【The invention's effect】
According to the present invention, since the tip portions of the valve pressers 33 and 34 disposed above the discharge valves 31 and 32 are formed to be deflected upward, even a compressor with a large discharge amount is discharged. Collision and sliding contact between the tips of the valves 31 and 32 and the valve pressers 33 and 34 can be prevented, and a failure such as breakage of the discharge valve due to this can be prevented, and a highly durable compressor can be provided. Further, the design of the valve body is not changed due to the large discharge amount, and a compressor with a high discharge amount can be produced with the same valve body as the conventional one, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall external view of a two-stage compressor implementing a discharge valve mechanism of the present invention. FIG. 2 is a longitudinal sectional view showing an internal mechanism of a two-stage compressor of the same embodiment. FIG. 4 is a side view showing the shape of the valve presser of the discharge valve mechanism of the present invention. FIG. 5 is a cross-sectional view showing the operating state of the discharge valve of the discharge valve mechanism of the present invention. ] Side view showing the shape of the valve retainer used in the conventional discharge valve mechanism. [FIG. 7] Cross-sectional view showing the operating state of the discharge valve of the conventional discharge valve mechanism.
11, 12 Cylinder 13, 14 Piston 17, 18 Valve seat plate 21, 22 Intake chamber 23, 24 Discharge chamber 25, 26 Intake port 27, 28 Discharge port 29, 30 Intake valve 31, 32 Discharge valve 33, 34 Valve presser

Claims (1)

In each compresses air sucked through the suction valve by a piston which is reciprocated in a cylinder, a compressor having a compression mechanism of the two front and rear stages which issued discharged through the discharge valve of compressed air, downstream of the compression mechanism from a thin plate-like discharge valves for opening and closing the cylinder and a discharge port formed in the arranged valve seat plate between the cylinder head constituting a valve guard for restricting the displacement of the upwardly disposed discharge valve of the discharge valve The shape of the contact surface of the valve presser with the discharge valve is formed by increasing the curvature of the tip portion and deflecting upward so that the tip of the discharge valve does not contact the valve presser. Compressor discharge valve mechanism.

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