Air Compressor Equipment

Abstract

To provide an air compressor device capable of suppressing vibration due to reciprocating motion of a piston.SOLUTION: A pair of upper and lower air compressors 20, 20 is vertically symmetrically arranged in an octagonal cylinder-shaped housing 10 with both front and rear end surfaces closed, and a pair of left and right air compressors 20, 20 are arranged symmetrically; a driving shaft 32 driven by a motor 31 is rotatably mounted in the housing 10; a crank mechanism is connected to the driving shaft; a pantograph mechanism 50 is connected to the crank mechanism via a connecting rod 43; and each piston 27 of the four air compressors 20 is pivotally attached to four pins 51 of the pantograph mechanism 50, respectively.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an air compressor device for generating compressed air. [Background technology]

[0002] One example of an air compressor device is a two-cylinder air compressor that includes a pair of housings provided at both ends of a motor to accommodate ball bearings for the motor shaft, a pair of cylinders provided in the pair of housings, and a pair of pistons connected to the shaft and reciprocating within the pair of cylinders (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-115283 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] However, this two-cylinder air compressor has the problem that vibration increases due to the reciprocating motion of the two pistons.

[0005] An object of the present invention is to provide an air compressor device that can suppress vibrations caused by the reciprocating motion of a piston. [Means for solving the problem]

[0006] Representative means for solving the above problems are as follows. a housing having a square cylindrical shape with closed end faces; A pair of air compressors arranged symmetrically above and below the housing, and the housing a pair of air compressors arranged symmetrically on the left and right sides of the a driving shaft rotatably mounted within the housing; a crank mechanism connected to the driving shaft; The pistons of the air compressor are connected to the crank mechanism and are connected to four pins. a pantograph mechanism pivotally mounted thereon; It is equipped with The housing is divided into a pair of divided bodies by a plane parallel to the center line of the driving shaft, One of the divided bodies upper side said air compressor and right side The air compressor Equipped , and the other of the divided bodies lower side said air compressor and left side The air compressor It is equipped, Characterized by Air compressor equipment. [Effects of the Invention]

[0007] According to the above-mentioned means, vibrations caused by the reciprocating motion of the piston can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a partially cutaway front view showing an air compressor device according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. [Figure 4] This is also a skeleton diagram of the main parts. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

[0010] 1 to 4 show an embodiment of an air compressor device according to the present invention.

[0011] The air compressor device of this embodiment includes a housing 10 having an octagonal cylindrical shape with both end faces (hereinafter referred to as the front and rear end faces) closed. The housing 10 is divided into a pair of segments 11, 11 (so-called vertical split) on a plane including the center line, and the pair of segments 11, 11 are joined together with their divided faces facing each other. A pair of flanges 12, 12 of a fixed width are respectively provided on the cut end edges of the dividing walls of the pair of segments 11, 11, protruding radially outward, and the pair of opposing flanges 12, 12 are fastened together with bolts 13.

[0012] The housing 10 is provided with air compressors 20 on a pair of opposing side walls at the top and bottom and a pair of opposing side walls at the left and right. The four air compressors 20 are identically configured and are mounted symmetrically in the center of the housing 10. A mounting hole 21A is formed in the side wall of the housing 10 on which the air compressor 20 is mounted, and the cylinder 21 of the air compressor 20 is fitted into the mounting hole 21A. The center line of the cylinder 21 passes through the center line of the housing 10, and the center lines of the cylinders 21, 21 of the pair of opposing air compressors 20, 20 are aligned.

[0013] The outer end surface of a cylinder chamber 21a formed in the cylinder 21 is closed by a cylinder head 23 fastened with bolts 22. The cylinder head 23 is provided with an intake port 24 for drawing in outside air and a discharge port 25 for discharging compressed air. A valve plate 26 is interposed between the cylinder 21 and the cylinder head 23, and an intake valve (not shown) and a discharge valve (not shown) are opened on the valve plate 26. The intake valve draws outside air into the cylinder chamber 21a through an intake port 24. The discharge valve discharges compressed air from the cylinder chamber 21a to a discharge port 25.

[0014] A piston head 27a of a piston 27 is slidably inserted into the cylinder chamber 21a, and a piston rod 27b protrudes along the centerline from the end face of the piston head 27a opposite the valve plate 26. A seal ring 28 is fitted onto the outer periphery of the piston head 27a, and the seal ring 28 airtightly seals the clearance between the piston head 27a and the cylinder chamber 21a.

[0015] A piston drive device 30 is installed in the housing 10 to simultaneously drive the pistons of the four air compressors. The piston drive device 30 is equipped with a drive shaft 32 that is rotationally driven by a motor 31 (see FIG. 4). The drive shaft 32 is rotatably mounted between the front and rear end walls of the housing 10. The front end of the drive shaft 32 is inserted into a front mounting hole 14 opened in the center of the front end wall of the housing 10 and rotatably supported by a front bearing 15, while the rear end of the drive shaft 32 is inserted into a rear mounting hole 16 opened in the center of the rear end wall of the housing 10 and rotatably supported by a rear bearing 17 and a seal ring 18.

[0016] A pair of crank mechanisms 40, 40 are attached to the driving shaft 32 in a symmetrical manner at the front and rear. The crank mechanism 40 includes a disk-shaped crank arm 41, which protrudes and is disposed perpendicular to the driving shaft (crankshaft) 32. The center of the crank arm 41 is eccentric with respect to the center of the driving shaft 32, and the eccentric center of the crank arm 41 essentially constitutes a crank pin 42. The inner end of a connecting rod 43 is pivotally attached to the outer periphery of the crank arm 41 via a bearing 44, and a pin 51 (described later) is pivotally attached to the outer end of the connecting rod 43 via a bearing 45.

[0017] A pair of pantograph mechanisms (four-bar linkage mechanisms) 50, 50 are provided symmetrically in the front and rear of the housing 10. The pantograph mechanism 50 is arranged in a parallelogram shape and is connected by four pins 51, 51, 51, 51. The four links 52, 52, 52, 52 are set to be equal in length. Therefore, a total of eight links 52 are arranged, four on the front pantograph mechanism 50 and four on the rear pantograph mechanism 50. The pin 51 is formed of a round pipe. Both ends of the link 52 are pivotally fitted to the pin 51 so as to be rotatable but not axially movable. The end of the piston rod 27b opposite to the piston head 27a is rotatably fitted and pivotally attached to the middle portion of the pin 51.

[0018] An oil supply device 60 for supplying oil into the housing 10 is installed on the outer end surface of the front wall of the housing 10. The oil supply device 60 is formed by a hydraulic pump driven by a motor (not shown). A nozzle 61 protrudes inward from the inner end face of the oil supply device 60, and the nozzle 61 sprays oil mist into the housing 10. A bearing oil supply pipe 62 is connected to the side of the oil supply device 60, and the bearing oil supply pipe 62 supplies oil to the front mounting hole 14. An indoor oil supply pipe 63 is connected to another position on the side of the oil supply device 60, and the indoor oil supply pipe 63 supplies oil into the housing 10.

[0019] Next, the operation will be described.

[0020] When the drive shaft 32 is rotated by the motor 31, the piston 27 of the air compressor 20 is reciprocated within the cylinder 21 via the crank mechanism 40 and the pantograph mechanism 50. During the intake stroke of the piston 27, air drawn into the intake port 24 is drawn into the cylinder chamber 21a via the intake valve of the valve plate 26. During the discharge stroke of the piston 27, the air in the cylinder chamber 21a is compressed, and the compressed air is discharged to the discharge port 25 via the discharge valve of the valve plate 26. At this time, the pistons 27, 27 of the upper and lower air compressors 20, 20 and the pistons 27, 27 of the left and right air compressors 20, 20 reciprocate alternately, thereby canceling out the inertial forces and suppressing vibration of the entire air compressor device. When one pair of air compressors 20, 20 is undergoing a compression stroke, the residual pressure in the other pair of air compressors 20, 20 during a suction stroke assists the rotation of the drive shaft 32.

[0021] According to this embodiment, the following effects can be obtained.

[0022] (1) By alternately reciprocating the pistons of the air compressors arranged symmetrically above and below and the pistons of the air compressors arranged symmetrically left and right by the driving shaft via a crank mechanism and a pantograph mechanism, the inertial force can be offset, thereby suppressing vibration of the entire air compressor device.

[0023] (2) By alternately reciprocating the pistons of the air compressors arranged symmetrically above and below and the pistons of the air compressors arranged symmetrically left and right by the driving shaft via a crank mechanism and a pantograph mechanism, the intake stroke and the compression stroke can be carried out with each rotation of the driving shaft. Therefore, compared to when an air compressor device is formed by a single air compressor (single cylinder), torque fluctuations can be suppressed, and the output of the motor (prime mover) can be reduced.

[0024] (3) When one pair of air compressors is in the compression stroke, the residual pressure in the other pair of air compressors in the suction stroke assists the rotation of the drive shaft, thereby reducing power consumption.

[0025] (4) By installing four air compressors (four cylinders) at 90-degree intervals, the length in the direction of the driving shaft can be shortened compared to when four air compressors are arranged in series (in-line four-cylinder) or in two rows in a V-shape (V-shape two-cylinder), making it possible to make the unit more compact.

[0026] (5) By pivotally connecting the links of the pair of pantograph mechanisms so that they cannot move in the axial direction but can rotate freely, it is possible to suppress lateral vibration of the pair of pantograph mechanisms.

[0027] (6) By forming the pin of the pantograph mechanism from a round pipe, it is possible to reduce the weight of the pin while ensuring its strength.

[0028] (7) The moving mechanism can be lubricated by installing an oil supply device equipped with a nozzle that sprays oil mist into the housing, a bearing oil supply pipe that supplies oil to the front mounting hole, and an indoor oil supply pipe that supplies oil into the housing.

[0029] (8) A four-cylinder air compressor device can be constructed without changing the length of the two-cylinder air compressor device in the driving shaft direction.

[0030] It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0031] For example, the housing is not limited to being formed in a two-piece structure, but may be formed by attaching end plates to both ends of a square tube.

[0032] The links of the pantograph mechanism are not limited to flat plates, but may be formed from square pipes or the like.

[0033] The pins of the pantograph mechanism are not limited to being formed from round pipes, but may be formed from round bars or the like.

[0034] The motor may be connected to the drive shaft via a shaft coupling.

[0035] The hydraulic pump of the oil supply device that supplies oil into the housing is not limited to being driven by a motor, but may be driven by air pressure. [Explanation of symbols]

[0036] 10...housing, 11...divided body, 12...flange, 13...bolt, 14, 16...mounting hole, 15, 17...bearing, 18...seal ring, 20...Air compressor, 21...Cylinder, 21A...Mounting hole, 21a...Cylinder chamber, 22...Bolt, 23...Cylinder head, 24...Suction port, 25...Discharge port, 26...Valve plate, 27...Piston, 27a...Piston head, 27b...Piston rod, 28...Seal ring, 30...piston drive device, 31...motor, 32...driving shaft, 40... crank mechanism, 41... crank arm, 42... crank pin, 43... connecting rod, 44... bearing, 45... bearing, 50... Pantograph mechanism, 51... Pin, 52... Link, 60...Oil supply device, 61...Nozzle, 62...Bearing oil supply pipe, 63...Indoor oil supply pipe.

Claims

1. a housing having a square cylindrical shape with closed end faces; a pair of air compressors arranged symmetrically in the vertical direction in the housing, and a pair of air compressors arranged symmetrically in the horizontal direction in the housing; a driving shaft rotatably mounted within the housing; a crank mechanism connected to the driving shaft; a pantograph mechanism connected to the crank mechanism, in which pistons of the air compressor are pivotally mounted on four pins; It is equipped with The housing is divided into a pair of divided bodies by a plane parallel to the center line of the driving shaft, The upper air compressor and the right air compressor are installed on one of the divided bodies, and the lower air compressor and the left air compressor are installed on the other of the divided bodies. An air compressor device characterized by:

2. The housing is provided with a nozzle for spraying oil into the housing.

2. The air compressor device according to claim 1.

3. The crank mechanism and the pantograph mechanism are connected by a connecting rod. are 3. The air compressor device according to claim 1 or 2.

4. The pantograph mechanism is pivotally connected to the link, and is a parallel quadrilateral with the pin as the apex. It is formed into a quadrilateral, 4. The air compressor device according to claim 1, 2 or 3.

5. the pin of the pantograph mechanism is formed of a round pipe, 5. An air compressor device according to claim 1, 2, 3 or 4.

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