JPH0451668B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a reciprocating compressor, which compresses the cylinder by reciprocating the cylinder in the left-right direction while keeping the piston in a fixed state without reciprocating. This invention relates to a drive type oilless compressor.

[Prior Art] Conventionally, as a reciprocating type oilless compressor (hereinafter simply referred to as a compressor), one shown in FIG. 5 is known. In the figure, reference numeral 1 denotes a motor that drives a compressor, and the main shaft of the motor 1 protrudes into a crankcase 2, to which a crankshaft 3 that also serves as a balance weight is attached. A large end 4a of a connecting rod 4 is attached to the crankshaft 3, and a piston pin 5 is attached to the small end 4b of the connecting rod 4 via grease-sealed bearings 6 and 7, respectively. Furthermore, the piston pin 5 has a piston 8
However, a piston ring 9 and a rider ring 10 are attached to the outer periphery of the piston 8 so that the piston 8 reciprocates in the vertical direction within the cylinder 11.

On the other hand, the crankcase 2 has a breather port 2a in order to release the back pressure inside the crankcase 2 to the atmosphere.
is open, and the air pushed out from this opening 2a is guided by a cooling fan cover 13 attached over the cylinder head 12, and the compression heat generated from inside the cylinder head 12, etc. It cools by blowing it away.

In the above compressor, when the motor 1 rotates, the crankshaft 3 rotates, and the piston 8 reciprocates within the cylinder 11 via the connecting rod 4, so that the compressor starts operating. Heat of compression is generated. The issue is how to effectively release this compression heat to the outside. That is, in order to enhance the cooling effect, improve the amount of air, and extend the life of the compressor, it is necessary to cool the cylinder head, cylinder, etc. For this reason, it is necessary to install a cooling fan separately or install not only a cooling fan but also a cooling fan cover to effectively blow air to the cylinder head and cylinder section.
As shown in the figure, a cooling fan is not used at all, but a method is taken that utilizes air flow due to back pressure within the crankcase and provides a cooling fan guide.

[Problems to be Solved by the Invention] However, in all of these compressor cooling means, the cooling air to the cylinder or cylinder head only hits the cylinder side facing the cooling fan, which reduces the cooling effect. There was a limit. Furthermore, when the piston is reciprocated within the cylinder by the crank mechanism, the sound of the piston hitting the cylinder due to the oscillation of the piston increases the operating noise of the compressor.

[Means for Solving the Problems] As described above, the present invention aims to solve the problems of the conventional piston by fixing the piston and moving the cylinder back and forth by driving an eccentric rotor. It is.

That is, a piston part is formed on the outer periphery of the discharge pipe, a cylinder in which the piston part can be housed is attached to pass through the discharge pipe, and a rotor receiving part is formed on the outside of the cylinder, and a rotor receiving part is formed in the rotor receiving part. The cylinder is configured to include an eccentric rotor, and when the eccentric rotor is rotationally driven, the cylinder reciprocates in the left and right direction.

[Function] The present invention has a structure in which, by driving the eccentric rotor with a motor, the displacement due to the rotation of the eccentric rotor is transmitted to the rotor receiver of the cylinder, and the cylinder reciprocates in the left and right direction. By reciprocating the cylinder, the cylinder is brought into contact with the air around the cylinder, without the need for blowing air from a cooling fan, and the cylinder can be effectively cooled over the entire surface. Since the piston is fixed and does not move, there is no oscillating movement of the piston, and there is no noise caused by the piston hitting the cylinder due to the oscillation of the piston.

[Example] As shown in FIGS. 1 to 3, a piston part 15 is formed on the outer periphery of a discharge pipe 14 made of a hollow shaft, and a cylinder 16 in which the piston part 15 can be housed is provided.
is attached through the discharge pipe 14, and furthermore, a rotor receiving part 17,
17, and the rotor receiving portion 17,
17 is provided with an eccentric rotor 19 directly connected to the motor main shaft 18, and the eccentric rotor 19 is rotated between the rotor receiving portions, whereby the cylinder 1
6 is configured to reciprocate in the left and right direction. Next, in the main body of the compressor, as shown in FIG.
A piston ring 19 made of a self-lubricating material is mounted in the piston ring groove 17, and a discharge hole 19, 1 is formed in the discharge valve chamber 18, communicating with the interior of the cylinder 16.
9 and a discharge hole 21 communicating with the discharge pipe 14, and the discharge holes 19, 19 are provided with discharge valves 22, 2.
2 is installed. Furthermore, the cylinder 16
A valve spacer 26, 26 having a suction port 24 and a suction valve 25 is attached to the valve spacer 26, 26 through the cylinder gasket 23, 23 in the left and right direction of the valve spacer 26, 26.
Heads 30 and 30 having an air intake port 28 and a filter layer 29 are attached to the outside of the cylinder head through packings 27 and 27 to integrate them, and the valve spacer 26 and the inner periphery of the head 30 and the discharge pipe 20 are connected to each other. A sealing 31 and a rider ring 32 are attached to the sliding contact portions with the outer periphery, respectively. Further, the piston portion 15 is divided into two parts, and is fixed together with a bolt in the discharge pipe 20. Further, a balance weight is attached to the motor main shaft 18 to which the eccentric rotor 19 is attached. Describing the operation based on the above configuration, when the motor main shaft 18 rotates,
The eccentric rotor 19 is rotationally driven, and the eccentric rotor 19
The outer ring is the rotor receiving part 17, 17 of the cylinder 16.
The cylinder 16 moves back and forth in the left-right direction with respect to the fixed discharge pipe 14.

Now, focusing on the cylinder 16 chamber on the right side, when the cylinder 16 moves to the right, the pressure inside the cylinder 16 chamber becomes negative, and the air in the atmosphere passes through the filter layer 29 from the air intake port 28 of the head 30, and then through the valve. Suction port 24 of spacer 26, suction valve 2
5 into the cylinder 16 chamber. Next, when the cylinder 16 moves to the left, the suction valve 2
5 seals the suction port 24 and seals the cylinder 16
The volume of the air inside the room is reduced, the discharge valve 22 of the discharge hole 19 opens due to the pressure, and the air inside the cylinder 16 reaches the discharge pipe 20 through the discharge hole 21 . The suction and compression strokes in the left cylinder 16 chambers are also opposite to those in the right cylinder 16 chambers, and are alternately performed. During compression operation, the cylinder 16 and valve spacer 26 are damaged by the heat of compression.
The head 30 becomes hot, but since the cylinder 16 is constantly moving back and forth in the left and right direction, the cylinder 1
6. The valve spacer 26, the entire outer wall of the head 30, and the entire outer wall of the discharge pipe are in sufficient contact with the surrounding air, and in order to dissipate the heat generated from inside, near the outer wall surface. This eliminates heat build-up and greatly increases the cooling effect. Furthermore, since the piston portion 15 is fixed even during operation of the compressor, the piston portion 15
There is no shaking of the head, and no noise is generated by the shaking of the head.

[Effects of the Invention] As described above, according to the present invention, the cylinder is reciprocated in the left and right direction by the rotational drive of the eccentric rotor, so that the entire surface of the cylinder is free from the air in the atmosphere. Direct contact flow is generated, which improves the cooling effect compared to cooling with a cooling fan, and since the piston is fixed, noise caused by the piston's oscillation can be eliminated. Further, in the compressor of the present invention, the stroke of the cylinder can be easily adjusted by changing the eccentric rotor. Furthermore, since a piston reciprocating mechanism and a crankcase are not required, the height in the vertical direction can be reduced, and miniaturization can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the mechanism of the present invention. FIG. 2 is a partial side view of one embodiment of the present invention. Figure 3 is a front view of the same part. FIG. 4 is a side sectional view of the main body of the compressor. Fifth
The figure is a side view of a conventional compressor. 14...Discharge piping, 15...Piston part, 16
... Cylinder, 17 ... Rotor receiving part, 19 ...
eccentric rotor.

Claims (1)

[Scope of Claims] 1. A piston part is formed on the outer periphery of a discharge pipe, a cylinder in which the piston part can be accommodated is attached to pass through the discharge pipe, and a rotor receiving part is formed on the outside of the cylinder. A cylinder-driven oil-less compressor, wherein an eccentric rotor is disposed in an outer rotor receiving portion, and the cylinder reciprocates in the left-right direction when the eccentric rotor is rotationally driven. 2. The piston part has a piston ring groove formed on its outer periphery and a discharge valve chamber formed inside thereof, and a piston ring made of a self-lubricating material is installed in the piston ring groove, and a piston ring made of a self-lubricating material is installed in the piston ring groove, and a piston ring made of a self-lubricating material is installed in the piston ring groove. The cylinder-driven type according to claim 1, wherein the cylinder-driven type forms a discharge hole communicating with the cylinder chamber and a discharge hole communicating with the discharge pipe, and further has a discharge valve attached to the discharge hole. Oil-less compressor. 3. A valve spacer having a suction port and a suction valve is attached in the left and right direction of the cylinder via a cylinder packing, and a head having an air intake port and a filter layer is attached to the outside of the valve spacer via a cylinder head packing, and integrated. 2. The cylinder-driven oil-less compressor according to claim 1, further comprising a sealing ring and a rider ring attached to the inner periphery of the valve spacer and the head, and the sliding contact portion with the outer periphery of the discharge pipe, respectively.