JPH021501Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an air compressor.

The discharge valve part of the air compressor is
The temperature of the compressed air is very high.

In addition, atomized lubricating oil is mixed in the pressurized air discharged from the discharge valve.

Therefore, the lubricating oil may be carbonized when passing through the discharge valve, which is heated to a high temperature.

In this case, if such carbonization occurs, the carbide may adhere to the discharge valve part and deteriorate its valve action, or the carbide may fall into the cylinder and become wedged between the piston and cylinder. , there is a risk of damaging the cylinder.

For this reason, conventionally, an air compressor as shown in FIG. 1 has been used to solve this problem.

FIG. 1 shows the conventional air compressor in a side sectional view.

In FIG. 1, a piston 2 is fitted into a cylinder 1a bored in a cylinder body 1 so as to be able to slide in the axial direction. The portion supports a crankshaft (not shown).

A flange 1b is fixed to the cylinder body 1 in the radial direction at the open axial end of the cylinder 1a, and a gasket 1c and a valve seat 3 are provided between the flange 1b and the cylinder head 4. A reed valve 3b is sandwiched between the flange 1b and the valve seat 3.
is inserted.

4a is an inlet hole through which air flows; a port 3a formed in the valve seat 3, a reed valve 3b, and a step 1d form an intake valve; an outlet hole 4c is an outlet hole for compressed air; A fixed valve stopper 4e, a reed valve 3d, and a port 3c formed in the valve seat 3 form a discharge valve.

Note that 1e is a pin for fixing the reed valve 3b.

The operation of the conventional air compressor as described above will be explained below.

When a crankshaft (not shown) is driven by an engine or the like, the crank movement causes the piston 2 to move through the connecting rod 2a.
Sliding motion in the vertical direction.

During the sliding movement, when the piston 2 makes a downward expansion stroke, the inside of the displacement chamber 1g becomes a vacuum pressure, and as a result, the air in the inlet hole 4a and the port 3a, which are at atmospheric pressure, flows into the reed valve 3.
b is pushed open and flows into the displacement chamber 1g.

When the piston 2 enters the compression stroke for the air that has flowed into the displacement chamber 1g in this way, the air in the displacement chamber 1g is compressed by the rise of the piston 2, so the reed valve 3b is closed to the port 3a.
is closed, and the compressed air pushes open the reed valve 3d via the port 3c, and is forcedly sent to an air tank or the like (not shown) from the outlet hole 4c as indicated by an arrow 4f.

In the above-mentioned operation, the compressed air discharged from the port 3c has a very high temperature due to its compression action.

In addition, such high-temperature air is mixed with atomized lubricating oil as described above, and when the lubricating oil is carbonized by the high temperature, it may cause malfunction of the discharge valve as described above. A problem arises. Therefore, it is necessary to prevent such carbonization of lubricating oil.

Therefore, in FIG. 1, the fin 4d is exposed in the passage 4b, and the air discharged from the port 3c is brought into contact with the fin 4d, thereby transferring the heat in the compressed air from the fin 4d to the cylinder head 4. The transferred heat was then radiated to the atmosphere in an attempt to lower the temperature inside the passage 4b.

However, in these conventional configurations,
Since the fins 4d are configured to simply hang down from the wall surface of the ceiling portion of the cylinder head 4, that portion becomes a dead area area in the flow of discharged air, and the main flow of discharged air is directed by the arrow 4f. As a result, it exits to the exit hole 4c without contacting the fin 4d.

For this reason, the cooling of the discharged air in these conventional discharge valve portions has not been sufficient.

An object of the present invention is to provide an air compressor with improved cooling effect in the discharge valve portion as described above.

The present invention will be described below based on examples.

Figure 2 shows a cylinder head 1 according to the present invention, which is an improved version of the cylinder head 4 in Figure 1.
4 is shown in a side sectional view.

In FIG. 2, the cylinder body 10 and valve seat 3 are exactly the same as the conventional structure shown in FIG. 1, and the cylinder head 14 corresponds to the cylinder head 4 in FIG. The difference from FIG. 1 is that the structure of the chamber 14b between the port 3c and the outlet hole 14c is different as described below.

In FIG. 2, fin-shaped partitions 14d and 4f are exposed in the chamber 14b from the wall surface 14i of the ceiling portion of the cylinder head 14, and among these, the partition 14f extends until its tip contacts the valve seat 3. .

Further, as shown in FIG. 3, a good cross section of the chamber 14b is a valve stopper 14e, 1 where a discharge valve is present.
The flow path of the discharged air from the position 4e to the outlet hole 14c forms a maze-like flow path with the partitions 14d and 14f.

The operation of the configurations shown in FIGS. 2 and 3 above will be explained.

Air is sucked through the inlet hole 14a, the sucked air is compressed, and the compressed air is passed through the outlet hole 14c.
The operation of pushing it out and force-feeding it to an air tank or the like is the same as the conventional operation shown in FIG.
However, the flow of compressed air discharged from the port 3c to the outlet hole 14c via the chamber 14b meanders inside the chamber 14b formed in a maze shape, as shown by the arrow 14h in FIG. It is discharged to 14c.

As a result, the flow of compressed air discharged from the port 3c is sufficiently directed to the outer wall 14i, the partition 14d and the
4f, the compressed air flows out to the outlet hole 14c, so that the heat contained in the compressed air is effectively dissipated into the atmosphere from the outer wall 14i, partitions 14d, and 14f via the fins 14g.

As is clear from the above explanation, the effects of the present invention are as follows.

The compressed air from each divided discharge valve is not directed directly toward the outlet hole, but is first blown out in a direction perpendicular to the direction of the outlet hole by the U-shaped partition. The blown compressed air hits the wall of the chamber and flows along the wall toward the outlet hole. Therefore, unlike in the past, a dead area of air flow is not formed in the room, and the heat of the compressed air can be effectively transmitted to the U-shaped partition and the wall of the room.

In addition, since the U-shaped flow paths of both discharge valves are arranged symmetrically, the air flow from both U-shaped outlets to the outlet holes is also symmetrical. As a result, the airflow throughout the room effectively flows out to the outlet hole without forming a dead zone. Therefore, the heat transfer from the compressed air to the U-shaped partition and the wall of the chamber becomes even better.

In addition, the fins fixed in the U-shaped partition are installed at the outlet of each discharge valve, which has the highest temperature, so that the fins are effectively diverted from the compressed air near the outlet of the discharge valve toward the fins. Heat will flow.

In addition, since the fins are arranged facing the flow direction of the U-shaped flow path, they contribute to the rectification of the flow of compressed air and direct the flow from the U-shaped outlet to the wall of the chamber. It is designed to be effective.

[Brief explanation of drawings]

FIG. 1 shows a conventional air compressor in a side sectional view, FIG. 2 shows a side sectional view of the cylinder head 14 of the air compressor according to the present invention, and FIG. A cross-sectional view of FIG. 2 is shown. The symbols used in the examples are as follows. 10: cylinder body, 10a: cylinder, 1
0b: flange, 2: piston, 2a: connecting rod, 3: valve seat, 3a: port, 3b: reed valve, 3c: port, 3d: reed valve, 14: cylinder head, 14a: inlet hole,
14b: chamber, 14c: exit hole, 14d and 14
f: partition, 14e: valve stopper, 14g: fin, 14h: arrow, 14i: outer wall.

Claims (1)

[Claims for Utility Model Registration] A piston 2 is fitted into the cylinder 10a of the cylinder body 10 so as to allow sliding movement of the cylinder in the axial direction, and a piston 2 is fitted on the top dead center side of the piston. In the above structure, a displacement chamber 1g is formed by the piston, a suction valve and a discharge valve are provided in the displacement chamber, and a chamber 14b is provided between the discharge valve and the outlet hole 14c. The discharge valve is divided and provided, and the outlet hole is provided in a direction perpendicular to the direction in which the divided discharge valves are lined up from the middle of the two divided discharge valves, and the interior of the chamber is arranged between the two discharge valves. A U-shaped partition is provided symmetrically in the direction of the arrangement of the respective discharge valves with the middle thereof as the back and has an outlet part, and the outlet is opened from the U-shaped back part. An air pump characterized by having fins facing the direction and above both the discharge valves.
Compressa.