JPH0137184Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-pressure air compressor, and particularly to a guide device that accurately guides its air compression piston. A multistage air compressor that generates high pressure is equipped with multiple cylinders of different sizes and diameters, and the air compressed in the large diameter cylinder for low pressure is sent into the cylinder for high pressure, which has a smaller diameter, to increase the pressure. .

The high-pressure cylinder and piston will therefore have a significantly smaller diameter than the low-pressure piston, but will have the same stroke and will therefore be much more elongated.

If this elongated piston is directly connected to a connecting rod that is driven by the crankshaft and moves forward and backward while swinging, it will not only cause strain between the elongated piston and the cylinder, making it impossible to operate smoothly, but also damage the contact surface between the cylinder and piston. If the piston is damaged, leakage may occur, making it impossible to obtain high pressure, or, in extreme cases, causing problems such as the piston breaking.

In order to solve the above problems, this invention has a large diameter guide cylinder concentrically installed on the crankcase side of a small diameter elongated air compression cylinder, and the air compression cylinder is attached to the end face of the guide piston fitted to this guide cylinder. A rear end of a small-diameter air compression piston that fits into a cylinder is connected, and the guide piston and crankshaft are connected by a connecting rod, in which a flange is provided at the rear end of the air compression piston, The end of the air compression piston is fitted into the hole in the center of the presser plate fixed to the end surface with some play, and the end of the air compression piston is fitted into the recess provided in the center of the guide piston side surface in the center of the presser plate. The flanges at the ends of the air compression piston are fitted so that they can move freely within a certain range with some play in the front, back, left, right, top and bottom directions.

An embodiment of this device will be described in detail below with reference to the accompanying drawings.

In the figure, 1 is a crankcase, and 2 is a large diameter guide cylinder fixed to this case 1.
A small diameter air compression cylinder 3 is integrally fixed to the outer end of this guide cylinder 2, a top member 4 is fixed to the upper end of this cylinder 3, and a flange 6 is attached to the lower part of a shaft 5 fixed at the center of this top member. A push spring 8 is provided between the intake valve 7 and the collar 6, which are attached to the shaft 5 so as to be able to rise and fall on the lower side of the top member 4.

In addition, an exhaust port 9 is provided that extends from the lower end of the shaft 5 to the upper end of the top member 4, and a spring receiver 11 is fixed to the upper end of the shaft 5 protruding above the top member 4 with a nut 10, and the shaft is connected to the upper end of the top member 4. A press spring 15 is provided between the upper surface of the exhaust valve 12 which is fitted into the exhaust valve 5 so as to be able to rise and fall freely.

16 is a head with a communication hole 17 provided on its side.
communicates with the exhaust port 9, and a communication hole 18 provided on one side of the upper part of the cylinder 3 communicates with an intake port 19 provided in the top member 4, and this intake port 19 is opened and closed by the intake valve 7. Configure.

Furthermore, since the cylinder 3 is under considerably high pressure, a liner 20 is fixed inside. 21 is cylinder 3
An air compression piston 23 is slidably fitted within the guide cylinder 2 . A flange 22 is provided at the lower end of the air compression piston 21, and the lower end of the piston 21 is fitted into the hole 25 at the center of a retaining plate 24, which is fixed to the upper part of the guide piston 23 by bolting or the like, with a slight play. The collar 2 is inserted into the recess 26 formed at the lower center of the presser plate 24.
2 are fitted with some play left in the front, back, left and right, and up and down. A connecting rod 27 is rotatably connected to the guide piston 23 by a piston pin 28.

Although not shown, a crankshaft rotated by an appropriate drive mechanism is attached to the crankcase 1, and a crank pin provided on the crankshaft or a main connecting rod rotatably attached to the crank pin is attached to the crankcase 1. The connecting rod 27 is rotatably connected to the connecting rod 27.

In the case of the above embodiment, the large diameter guide cylinder 2 is placed on the crankcase side of the small diameter air compression cylinder 3.
A small-diameter air compression piston 21 that fits into the air compression cylinder 3 is connected to the guide piston 23 that fits into the guide cylinder 2, and a connecting rod 27 connects the guide piston 23 and the crankshaft.
Since the connecting rod 27 swings and reciprocates with the rotation of the crankshaft, and when the large-diameter guide piston 23 is reciprocated, the guide piston 23 is moved in the lateral direction. Even if a component force of 1 is applied, the piston 23 moves back and forth along the large-diameter guide cylinder 2, so the contact area is large.
Therefore, by sufficiently lubricating this contact portion, smooth reciprocating motion should be possible. However, if the air compression piston 21 and the guide piston 23 are fixedly connected, the air compression cylinder 3 and
Even if there is a slight error in the axis of the guide cylinder 2, breakage will occur between the air compression cylinder 3 and the air compression piston 21.

However, in this invention, a flange is provided at the rear end of the air compression piston as described above, and the end of the air compression piston is inserted into the center hole of the holding plate fixed to the end surface of the guide piston, leaving some play. Fit the flanges at the end of the air compression piston into the recess provided in the center of the guide piston-side surface of the holding plate in the front, back, left, right, top, and bottom directions within a certain range. Since they are fitted so that they can move freely, only the forward and backward movement of the guide piston is transmitted to the air compression piston. Therefore, there is a unique effect that there is no risk of breakage occurring between the air compression cylinder and the air compression piston, and there is no risk of the air compression piston being scratched or cut.

[Brief explanation of the drawing]

The drawing is an enlarged longitudinal sectional front view showing the main parts of the air compressor of this invention. 1... Crank case, 2... Guide cylinder, 3... Air compression cylinder, 21... Air compression piston, 23... Guide piston.

Claims (1)

[Scope of utility model registration request] A large-diameter guide cylinder is installed concentrically on the crankcase side of a small-diameter elongated air-compression cylinder, and the end face of the guide piston is fitted into the guide cylinder. In an air compressor in which the ends are connected and the guide piston and crankshaft are connected by a connecting rod, a collar is provided at the rear end of the air compression piston, and a flange is provided at the rear end of the air compression piston, and a collar is provided in the center hole of a presser plate fixed to the end surface of the guide piston. The ends of the air compression piston are fitted with some play, and the collar of the end of the air compression piston is fitted into the recess provided in the center of the guide piston side surface in the center of the holding plate. A guide device for an air compressor that is fitted so that it can move freely within a certain range with some play in the front, back, left, right, top and bottom.