JP2619749B2 - Reciprocating air compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor body having a pair of cylinders arranged horizontally opposed to each other so as to pressurize air by a piston reciprocating in a cylinder chamber, and a drive source for reciprocating the piston. The present invention relates to a reciprocating air compressor (hereinafter, simply referred to as a compressor) comprising an air-tank for storing compressed air pressurized by the compressor main body. This focuses on the arrangement relationship.

[0002]

2. Description of the Related Art In the above-mentioned compressor, for example,
As disclosed in Japanese Patent Application Laid-Open No. 0-133190 and Japanese Patent Laid-Open Publication No. Sho 51-66510, a motor as a driving source and a compressor body are assembled on an air tank. It is known that the longitudinal direction of the air tank is arranged so as to be orthogonal to the longitudinal direction of the air tank and the longitudinal direction of the air tank is arranged parallel to the moving direction of the piston as described in Japanese Utility Model Publication No. 16-16759. I have.

[0003]

In the above-mentioned conventional compressor, the former type, in which the piston moving direction of the compressor body is orthogonal to the longitudinal direction of the air tank, is a motor generated by reciprocating motion of the piston. The main body of the compressor acts around the longitudinal axis of the air-tank, which occupies most of the volume of the compressor, so that the whole vibrates greatly, causing misalignment and noise during operation. In the case of a small portable device having a small capacity, there is a concern that the device may fall down in an unstable place where installation conditions are poor. On the other hand, the latter compressor is effective in reducing vibration because the moment generated by the reciprocating motion of the piston acts in the longitudinal direction, but the heavy compressor body and the drive source spread in the longitudinal direction. Because they are arranged, the upper part becomes huge and the balance is poor, and the stability is lacking.

[0004]

According to the present invention, the direction of movement of the piston of the compressor body is made coincident with the longitudinal direction of the air tank to reduce vibration, and the drive source is disposed at the center of the air tank. Thereby, the stability is improved, and the weight balance is further improved by arranging the pair of cylinders horizontally. Here, the longitudinal direction of the air tank is clear when the air tank is elongated and integrated, but for example, when the separated tanks are connected or arranged in a line, the arrangement direction is Recognize as the longitudinal direction.

[0005]

The momentum generated by the reciprocating motion of the piston acts in the longitudinal direction of the air tank, which has the highest stability in the apparatus, so that the vibration is small and the driving source is air-driven.
By arranging it in the center of the tank, the center of gravity is lowered and the balance is excellent, and the driving source is not exposed and is protected by the tank. Further, in combination with the adoption of the horizontally opposed cylinder, it is possible to achieve a compact finish with less vibration.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a compressor according to the present invention will be described with reference to the drawings. Reference numeral 1 denotes a bale-shaped air tank having an internal cavity, and a motor chamber 2 having an open top surface is defined in the center. The air chamber 1a in the air tank 1 is kept airtight with respect to the motor chamber 2 and the outside. In the motor chamber 2, a motor 3, which is a driving source, rotates while keeping a clearance around the periphery. The eccentric cam 4a is housed above the rotating shaft 3a.
And a connecting rod 4b, the crank mechanism 4 of which is provided with a crankcase 6 having a suction port 5 provided with a filter 5a.
Covered with. A cooling fan 7 is attached to the tip of the rotating shaft 3a protruding upward from the crankcase 6.

Reference numeral 8 denotes a compressor body composed of a pair of opposed cylinders 8a, 8a and pistons 8b, 8b (one side is not shown). The compressor body 8 includes a connecting rod 4b of the crank mechanism 4 inside the cylinder 8a. Connected, motor 3
The piston 8b reciprocally driven via the crank mechanism 4 by the rotation of the piston 8b is slidably incorporated. A discharge passage 9 communicating with the inside of the air tank 1 is integrally provided at a tip end of the cylinder 8a. The compressor body 8 and the motor 3 are connected to each other through four bolts 2a via a mount. 2a... Are detachably attached to the air tank 1.

A discharge lead valve 10a is provided at the tip of the cylinder 8a, and the discharge port 1 communicates with the discharge passage 9.
In addition, a suction hole 11 provided with a suction lead valve 11a is provided at the tip of the piston 8b, and a check valve 12 is mounted at the tip of the discharge pipe 9. As a result, when the piston 8b reciprocates, first, the piston 8b
(The distal end of the cylinder and the distal end of the piston move away from each other in the direction in which the cylinder chamber expands).
When a is pushed open, air sucked from the suction port 6 passes through the crankcase 6 and is introduced into the cylinder chamber from the suction hole 11, and the air in the cylinder chamber is pressurized by the subsequent advance of the piston 8b. The pressure leads to the discharge lead valve 10.
a is pushed open, the compressed air is sent out to the discharge passage 9 through the discharge hole 10, and the compressed air sent out to the discharge passage 9 is
The check valve 12 is opened to fill the air chamber 1a of the air tank 1. In the course of the discharge passage 9, the compressed air is forcibly fed into the tank chamber 1a where the pressure is high for a short time before the motor 3 rises at the time of startup. An unload mechanism is provided to prevent a load from being applied.

The unloading mechanism is provided with a pressure adjusting chamber 13 provided with a pressure adjusting poppet valve 13a in the discharge passage 9. One of the poppet valves 13a is opened to the atmosphere and the other is connected via a pilot pipe 14. The solenoid valve 15 is controlled by a connected solenoid valve 15. One of the solenoid valves 15 is open to the atmosphere, and the other is connected to the air chamber 1a in the air tank 1. Although not shown, an orifice is set in the middle of the pilot pipe 14. When the operation is stopped, the solenoid valve 15 is switched to the air chamber side in the air tank 1 and the poppet valve 13
The pilot pressure acts on a, and the pressure adjustment chamber 13 is equal to the atmospheric pressure. When the operation is started, the solenoid valve 15 is switched to the atmosphere side, and the orifice in the pilot pipe 14 delays the poppet valve 13a to shut off from the atmosphere. Until the pressure regulating chamber 13 is shut off from the atmosphere in such a manner, the compressed air pushed out from the discharge hole 10 is released to the atmosphere without any load. It is pressed into.

At the lower part of the cooling fan 7, a wind direction changing plate 7a is mounted to efficiently take air into the motor chamber 2 to cool the motor 3 and to pass around the cylinder 8a. When the air is discharged, the cylinder 8a is also cooled. When the pressure in the air tank 1 exceeds a specified value, a safety mechanism for stopping the motor 3 by operating the pressure switch 16 is also set. The compressor according to the present embodiment is designed to be quiet, and the discharge path 9 is provided with a sound absorbing material 17 made of sintered metal immediately before the check valve, thereby opening and closing the discharge lead valve 10a. The flap sound is prevented from resonating in the air tank 1 and the cooling fan 7 is made of a damping steel plate or a damping paint is applied to reduce the vibration sound. Eccentric cam 4a
A concave portion is formed in the shaft to improve the rotational balance, thereby reducing the vibration generated in the crank mechanism 4. Reference numeral 18 shown in the drawing is a handle.

In the compressor constructed as described above, the compressor body 8 can be easily removed from the air tank 1 together with the motor 3, the cooling fan 7 and the piping by simply removing the four bolts 2a, 2a,. Since the separation can be performed, it is advantageous for maintenance. In this case, the discharge passage 9 is provided with the check valve 12 and the sound absorbing material 17.
The sound absorbing member 17 can be easily replaced since the air absorbing member 17 is divided while leaving the air absorbing member 17 in the air tank 1. From a structural point of view, the moment generated by the reciprocating motion of the piston 8b acts in the longitudinal direction of the air tank 1 having the highest stability in the apparatus, so that the vibration is small and the quiet operation is performed. In addition, since the driving source is housed in the center of the air tank 1, the size is small and the stability is good, and the driving source is protected from the outside.

In the compressor of this embodiment, the motor is arranged in a bale-shaped air tank, but the motor may be arranged between a pair of left and right spherical air tanks.
The driving source for the piston of the compressor body may be an internal combustion engine other than the motor. In this case, the effect is more remarkable if the direction of movement of the piston of the internal combustion engine also coincides with the longitudinal direction of the air tank.

[0013]

The compressor of the present invention is compact, well-balanced and excellent in stability, and the driving source is not exposed and the vibration is small. Ideal as a portable type.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a main part of a compressor according to the present invention, partially cut away when viewed from the front.

FIG. 2 is an explanatory view showing a main part of the compressor according to the present invention, partially cut away when viewed from above.

[Explanation of symbols]

1. Air tank, 1a air chamber, 2 motor chamber, 2a bolt, 3 motor, 3a rotating shaft,
4, crank mechanism, 4a, eccentric cam, 4b, connecting rod, 5, filter, 5a, suction port,
6. Crank case, 7. Cooling fan, 8. Compressor body, 8a cylinder, 8b piston, 9
Discharge path, 10 discharge port, 10a discharge discharge valve, 1
1. Suction port, 11a Suction lead valve, 12 Check valve, 13 Pressure regulating chamber, 13a Poppet valve
14. Pilot pipe, 15 solenoid valve, 16 pressure switch, 17 sound absorbing material, 18
handle.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Osamu Sato 2-50-12, Nishirokugo, Ota-ku, Tokyo Inside Nunnera Air Pressure Industry Co., Ltd. (56) References JP 50-79806 (JP, A) Japanese Utility Model Showa 51-39812 (JP, U) Japanese Utility Model Showa 55-119386 (JP, U) Japanese Utility Model 16-16759 (JP, Y1) Japanese Utility Model Showa 49-9261 (JP, Y1)

Claims (1)

(57) [Claims] 1. A compressor body having a pair of cylinders arranged horizontally opposed to each other to pressurize air by a piston reciprocating in a cylinder chamber, a driving source for reciprocatingly driving the piston, and a compressor body. An air-tank for accumulating compressed compressed air, wherein a moving direction of a piston of the compressor main body is made coincident with a longitudinal direction of the air-tank, and the driving source is located in the air-tank. Reciprocating air compressor located in the center of the machine.