JPS581275B2 - compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor with an improved compressed gas discharge structure.

The compressor includes a compression mechanism within its case, and the compression mechanism compresses the gas to be compressed.

The above compression mechanism is equipped with a piston inside a cylinder.
The operation of the piston causes the gas to be compressed to be sucked in from the suction hole of the cylinder, compressed, and then the discharge valve is opened to cause the gas to be discharged from the discharge hole.

However, in the conventional type, the inside of the discharge hole is simply a space, so if the diameter of the discharge hole is set to 100 mm, the clearance volume increases and the compression efficiency decreases.

For this reason, the diameter of the discharge hole cannot be made uniform, and the pressing force of the compressed gas against the discharge valve is weakened, and the opening of the discharge valve is delayed, resulting in overcompression of the compressed gas, reducing compression efficiency, and especially during startup. There was a problem in that the amount of overcompression was large at times, causing startup failures.

In some medium-sized or larger compressors, the clearance volume due to the discharge hole is eliminated by providing a protrusion on the piston, but in this case, the protrusion and the discharge hole are connected to the cylinder. The suction hole must be positioned on the center line, which requires high positioning accuracy, and the area in which the suction hole is formed is limited, making it impossible to secure a sufficient area for the suction hole.

The present invention has been made in view of the above circumstances, and its purpose is to increase the clearance volume even if the diameter of the discharge hole is reduced by providing a float that is moved by gas pressure in the discharge hole. The purpose of this invention is to provide a compressor that avoids this problem.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is a case of a compressor, and inside this case 1, a cylinder block 3 constituting a compression mechanism section 2 is provided.

A cylinder chamber 4 is provided in the center of the cylinder block 3, and muffling chambers 5, 8 on the suction side are provided on one side, and muffling chambers 7, 8 on the discharge side are provided on the other side.

9 is a suction valve 10 that opens and closes the suction port 10a and a discharge hole 1
This is a valve plate having a discharge valve 11 that opens and closes 1a.

Also, a piston 12 is slidably provided in the cylinder chamber 4.
is inserted, and this piston 12 is operated by an electric mechanism (not shown).

Further, a suction pipe 5a is connected to the muffling chamber 5 on the suction side, and a discharge pipe 8a is connected to the muffling chamber 8 on the discharge side.

On the other hand, as shown in FIG. 2, the discharge hole 11a is formed in a shape that becomes narrower toward the cylinder chamber 4 side, for example, in a tapered shape, and the inside of the discharge hole 11a has approximately the same shape as the discharge hole 11a. A float 13 separate from the discharge valve 11 formed in a tapered shape is provided so as to be movable up and down.

The float 13 can be moved by the pressure of compressed gas.

In the above configuration, when the piston 12 is operated, the compressed gas is sucked into the cylinder chamber 4 from the suction port 10a via the suction pipe 5a and the muffling chambers 5 and 6.
It is then compressed and pushes up the float 13.

When the compressed gas is compressed by a predetermined amount, the flow N3 pushes up the discharge valve 11, the discharge hole 11a is opened, and the compressed gas is discharged.

As described above, since the float 13 is provided in the discharge hole 11a, even if the diameter of the discharge hole 11a is increased, the clearance volume due to the discharge hole 11a does not increase.

Therefore, by increasing the diameter of the discharge hole 11a, the pressing force acting on the discharge valve 11 can be increased, and the discharge valve 11 can be operated quickly to open the discharge hole 11a quickly. Over-compression will be prevented.

The pressing force of the discharge valve 11 is determined by the internal pressure of the cylinder chamber 4 and the discharge chamber 15a of the valve cover 15, assuming that the area of the discharge hole 11a is A.
If the difference with the internal pressure is ΔP, it is given by A×ΔP.

Note that the present invention is not limited to the above embodiment,
As shown in FIG. 4, the lower end of the float 14 may be made to protrude into the cylinder chamber 4 by the dimension t.

According to this, the reduction in compression efficiency due to the space formed between the tip end surface of the piston 12 and the valve plate 9 at the top dead center of the piston 12 can be prevented by the float 1.
4 can be lowered by the lower end.

As explained above, the present invention has a discharge hole formed in a shape that becomes narrower toward the cylinder side, and a float that is separate from the discharge valve and has approximately the same shape as the discharge hole is movable inside the discharge hole. Since the diameter of the discharge hole is increased, the clearance volume does not increase even if the diameter of the discharge hole is increased, and the discharge valve can be opened quickly by increasing the diameter of the discharge hole.

Therefore, it is possible to prevent over-compression and improve compression efficiency, and it is also possible to prevent startup failures particularly at startup.

Moreover, the discharge hole may be located anywhere within the diameter of the cylinder, and high positioning accuracy is not required as in the case where a piston is provided with a protrusion.

Furthermore, by shifting the discharge hole from the center of the cylinder, the area of the suction hole can be increased, and the suction efficiency of the compressed gas can also be improved.

Furthermore, since the float is formed separately from the discharge valve, the clearance volume of the discharge hole can be reduced and the compression efficiency can be improved without adversely affecting the discharge valve, such as valve bending.

Furthermore, since the float is lifted in the direction of the central axis of the discharge hole at the beginning of discharge, there is no need for a gap between the discharge hole and the float, and the float can be brought into close contact with the discharge hole, increasing the clearance volume. It has the effect of being able to reduce the

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention; Figure 1 is a cross-sectional view of the compressor, Figure 2 is a vertical cross-sectional view of the main parts, and Figure 3 is a plan view thereof. , FIG. 4 is a longitudinal cross-sectional view showing another example of mounting the float. 3...Cylinder, 11...Discharge valve, 11a...Discharge hole,
14, 13...Float.

Claims (1)

[Claims] 1 In a cylinder that sucks compressed gas into a cylinder, compresses it, and then discharges it from a discharge hole that is opened and closed by a discharge valve, the discharge hole is formed in a shape that becomes narrower toward the cylinder side, and the inside of the discharge hole is 1. A compressor comprising a float that is moved by gas pressure, has substantially the same shape as the discharge hole, and is separate from the discharge valve.