JP2013163981A - Air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air compressor capable of reducing vibration associated with operation, as compared with conventional ones, while avoiding an increase in a body weight.SOLUTION: A driving shaft 23 is elastically coupled to a crankshaft 32 of a compression mechanism unit 3 so that rotation can be transferred thereto, via a flexible coupling 26 having elasticity or flexibility and serving as a rotation transfer member. A motor 2 is separated from the compression mechanism unit 3 and is fixed to a frame 42a, which connects two air tanks 41 of a tank unit 4, by a fastener 45 (fitting) such as a bolt. The compression mechanism unit 3 is elastically coupled to a frame 42b, which connects the two air tanks 41 of the tank unit 4, via an elastic member 43 by a fastener 44 (fitting) such as a bolt.

Description

  The present invention relates to an air compressor that generates compressed air necessary for driving an air tool such as a nail driver.

  In construction sites and the like, pneumatic tools for driving nails and screws into wood with the pressure of compressed air are widely used. In general, in an air compressor that drives a pneumatic tool or the like, the rotational motion of a rotational output shaft of a drive unit such as a motor is converted as a reciprocating motion of a piston in a cylinder via a crank shaft of a compressed air generation unit, It is comprised so that the air inhaled from the intake valve of the cylinder may be compressed by reciprocating motion. The compressed air compressed in the cylinder is discharged from the exhaust valve of the cylinder through the pipe to the air tank and stored in the air tank. Moreover, when compressing gas to a high pressure, a multistage reciprocating compressor that increases the pressure stepwise is generally used. Such an air compressor is disclosed in Patent Document 1, for example.

  Patent Document 1 states that “the compression portion 3 is coupled to one end side of the motor housing of the motor portion 2 via the stator holder 23, and the compression portion 3 is on the frame 9 connecting the air tanks 4 a and 4 b. Is fixed with bolts ”(paragraph [0044] of FIG. 2 and FIG. 2). In this case, since the motor part 2 and the compression part 3 are integrated and fixed to the frame 9, the mass of the vibrating part (excitation source) increases.

JP 2009-185648 A

  In the above conventional air compressor, the air compressor main body vibrates greatly due to vibration caused by the reciprocating motion of the piston. In addition, depending on the installation state with the floor surface, there may be a “position shift phenomenon” in which the installation position moves little by little due to vibration of the air compressor body. Here, if the weight of the air compressor main body is increased, it can be expected that the vibration is reduced. However, since the air compressor is carried by hand and used in various fields, the main body is configured to be as small and light as possible, and it is desirable to avoid an increase in weight.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide an air compressor capable of reducing vibration associated with operation compared to the conventional one while avoiding an increase in the weight of the main body. is there.

One embodiment of the present invention is an air compressor. This air compressor
A motor,
A compression mechanism driven by the motor;
A tank unit including an air tank for storing compressed air generated by the compression mechanism,
The motor is fixed to the tank part, and the compression mechanism is coupled to the tank part via an elastic member,
A rotation transmission member is provided that transmits the rotational force of the motor to the compression mechanism even when the rotation shaft of the motor and the rotation shaft of the compression mechanism are misaligned.

  The rotation transmission member may be a flexible coupling or a universal joint.

  A piping part for delivering the compressed air generated by the compression mechanism to the air tank may be provided, and the piping part may have elasticity.

  The piping part may be a flexible tube.

  The motor may not be directly coupled to the compression mechanism except for transmission of driving force.

  The motor may be fixed to the tank portion without an elastic member.

  The tank portion may include a frame that supports the air tank, and the compression mechanism may be coupled to the frame.

  The compression mechanism may be a reciprocating compression mechanism.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, since the motor is fixed to the tank portion without using the compression mechanism, it is possible to avoid an increase in the weight of the main body as compared with the case where the compression mechanism is fixed to the tank portion by integrating the motor and the compression mechanism. It is possible to reduce vibrations associated with driving.

The perspective view of the air compressor 1 which concerns on embodiment of this invention. The top view which showed the motor 2 and the compression mechanism part 3 of the air compressor 1 shown in FIG. 1 as a cross section (the cover 15 is abbreviate | omitting illustration). FIG. 2 is a front cross-sectional view showing a part of the air compressor 1 shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a perspective view of an air compressor 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the motor 2 and the compression mechanism unit 3 of the air compressor 1 as a cross section. FIG. 3 is a front sectional view showing a part of the air compressor 1 in a broken state. 2 and 3, the cover 15 is not shown.

  As shown in FIG. 1, the air compressor 1 has a structure in which a cover 15 is put on a tank portion 4 including a pair of air tanks 41 for storing compressed air. An anti-vibration supporting rubber foot 7 that comes into contact with the floor surface is provided integrally with the tank portion 4, and a carrying handle 6 is erected on the tank portion 4. As shown in FIGS. 2 and 3, the air compressor 1 controls the operation of the motor 2 that is a drive source, the compression mechanism unit 3 that is driven by the motor 2, and generates compressed air, inside the cover 15. The control circuit unit 5 is provided. The operator turns on / off the commercial AC power supplied to the air compressor 1 from the power cord 9 (FIG. 3) by operating the power switch 8 exposed from the cover 15. Drive power for the control circuit unit 5 and the motor 2 is supplied via the power switch 8.

  The motor 2 includes a rotor 21, a stator 22, and a drive shaft 23, and the rotation operation is controlled by the control circuit unit 5. One end of the drive shaft 23 is provided with a cooling fan 24, and the fan 24 is surrounded by a fan guide 25. On the other hand, the other end of the drive shaft 23 is elastically connected to the crankshaft 32 of the compression mechanism section 3 via a flexible coupling 26 (for example, made of resin or steel) as an elastic or flexible rotation transmission member. It is coupled so that rotation can be transmitted. Conventionally, the motor 2 is fixedly integrated with the compression mechanism unit. However, in the present embodiment, the motor 2 is separated from the compression mechanism unit 3 and is attached to the frame 42a that couples the two air tanks 41 of the tank unit 4. The motor 2 is fixed with a fastener 45 (metal fitting) such as a bolt. An elastic member is not used for the fixing.

  The compression mechanism unit 3 is a two-stage reciprocating compression mechanism, and includes a crankcase 31, a crankshaft 32, a high pressure side connecting rod 34a having a high pressure side piston 33a, a low pressure side connecting rod 34b having a low pressure side piston 33b, and a high pressure side cylinder. 35a and a low pressure side cylinder 35b. The high pressure side piston 33a and the high pressure side cylinder 35a form a high pressure side compression chamber 36a, and the low pressure side piston 33b and the low pressure side cylinder 35b form a low pressure side compression chamber 36b. Inside the high-pressure side connecting rod 34a and the low-pressure side connecting rod 34b, a high-pressure side crank arm 37a and a low-pressure side crank arm 37b are arranged via bearings 38, respectively. The high-pressure side crank arm 37a and the low-pressure side crank arm 37b are eccentrically attached to the crankshaft 32, and convert the rotational motion of the crankshaft 32 into the reciprocating motion of the high-pressure side piston 33a and the low-pressure side piston 33b. The crankshaft 32 is provided with a balancer 39 (flywheel) for canceling the unbalanced load of the crank arm and piston. The compression mechanism unit 3 is elastically coupled to a frame 42 b that couples the two air tanks 41 of the tank unit 4 with a fastener 44 (metal fitting) such as a bolt via an elastic member 43.

  The tank section 4 for storing compressed air is configured by connecting air tanks 41, which are a pair of cylindrical tanks arranged in parallel, for example, by frames 42a and 42b (fixed to the air tank 41 by welding, for example). Is connected to the compression mechanism 3. The pipe 10 is a flexible tube (for example, made of resin or metal) having elasticity. In addition, a safety valve (not shown) is attached to a part of the tank part 4, and when the pressure in the tank part 4 becomes abnormally high, a part of the compressed air is discharged to the outside. The abnormal pressure rise is prevented.

  The tank part 4 is provided with a pair of compressed air outlets 11, and an air tool (not shown) such as a nail driver is connected to each of the outlets 11 via a hose. A pressure reducing valve 12 is provided between the take-out port 11 side and the tank part 4, and has a function of reducing the pressure inside the tank part 4 to a pressure suitable for driving the air tool. Therefore, compressed air having a pressure equal to or lower than the allowable maximum pressure of the air tank 41 is obtained at the outlet 11 regardless of the pressure in the tank portion 4. A pressure gauge 13 is attached in the vicinity of the outlet 11 so that the pressure taken out from the outlet 11 can be monitored.

  Next, the production | generation process of the compressed air by the air compressor 1 is demonstrated roughly.

  The rotational motion of the motor 2 is transmitted to the crankshaft 32 via the drive shaft 23 and the flexible coupling 26, and rotates the high pressure side crank arm 37a and the low pressure side crank arm 37b. A high-pressure side connecting rod 34a is rotatably disposed on the outer periphery of the high-pressure side crank arm 37a via a bearing 38. It is converted into a reciprocating motion of the high pressure side piston 33a in contact therewith. Similarly, a low pressure side connecting rod 34b is rotatably disposed on the outer periphery of the low pressure side crank arm 37b via a bearing 38, and the low pressure side crank arm 37b rotates eccentrically to rotate the low pressure side cylinder 35b. Is converted into a reciprocating motion of the low-pressure side piston 33b that is inscribed therein.

  An external air suction valve (not shown) and a compressed air discharge valve (not shown) are provided on the upper walls of the high-pressure side compression chamber 36a and the low-pressure side compression chamber 36b, and air flows in only one direction. It has a function as a check valve. First, in the suction process in which the high pressure side piston 33a and the low pressure side piston 33b move downward from the top dead center to the bottom dead center in the high pressure side cylinder 35a and the low pressure side cylinder 35b, the external air is compressed into the high pressure side compression chamber 36a and the low pressure side compression. It is sucked into the chamber 36b. On the other hand, in the compression process in which the high pressure side piston 33a and the low pressure side piston 33b move upward from the bottom dead center to the top dead center in the high pressure side cylinder 35a and the low pressure side cylinder 35b, the high pressure side piston 33a and the low pressure side piston 33b are high pressure. The air in the side compression chamber 36a and the low-pressure side compression chamber 36b is compressed to generate compressed air. Further, the compressed air generated in the discharge process in which the high-pressure side piston 33a and the low-pressure side piston 33b reach the top dead center of the high-pressure side compression chamber 36a and the low-pressure side compression chamber 36b is discharged to the pipe 10 flowing through the tank portion 4. The The reciprocating motions of the high-pressure side piston 33a and the low-pressure side piston 33b are out of phase, and the compressed air discharged from the low-pressure side compression chamber 36b is sucked into the high-pressure side compression chamber 36a, and the compression discharged from the high-pressure side compression chamber 36a. Air is supplied to the air tank 7 through the pipe 10. The air compressed by the compression mechanism unit 3 is supplied into the tank unit 4 through the pipe 10 from the discharge port. The supplied compressed air has a pressure of, for example, about 3.0 to 4.5 MPa in the tank portion 4.

  By repeating the above suction process, compression process, and discharge process by the reciprocating motion of the high pressure side piston 33a and the low pressure side piston 33b, compressed air having an allowable maximum pressure can be supplied from the compression mechanism section 3 to the tank section 4.

  The compression mechanism section 3 vibrates due to the reciprocating motion of the high-pressure side piston 33a and the low-pressure side piston 33b described above, and this vibration is transmitted to the tank section 4, so that the entire air compressor 1 vibrates. In the present embodiment, the motor 2 is separated from the compression mechanism portion 3 that is a large excitation source compared to itself, and is directly fixed to the tank portion 4. Therefore, compared with the case where the motor 2 is integrated with the compression mechanism unit 3, the mass of the excitation source (the portion that vibrates integrally with the compression mechanism unit 3) is reduced, while it is not the excitation source or is relatively free of vibration. Since the mass and the moment of inertia of the small portion are increased by the motor 2, the tank portion 4 is less likely to vibrate, and the vibration of the entire air compressor 1 can be reduced. Further, since the drive shaft 23 and the crankshaft 32 are elastically coupled using the flexible coupling 26, the drive shaft 23 and the crankshaft 32 are caused by misalignment caused by assembly or vibration of the compression mechanism section 3. Damage can be prevented, and the life of these parts can be extended. Moreover, since the piping 10 which connects the compression mechanism part 3 and the air tank 41 is made into the flexible tube which has elasticity, for example, it becomes possible to prevent damage to the piping 10 by the vibration of the compression mechanism part 3. FIG.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described. For example, the same effect can be obtained even if a universal joint such as a propeller shaft of an automobile is used instead of the flexible coupling. Further, for example, an elastic member may be provided between the motor 2 and the tank portion.

1.101. 1. Air compressor Motor 21. Rotor 22. Stator 23. Drive shaft 24. Fan 25. Fan guide 26. 2. Flexible coupling Compression mechanism 31. Crankcase 32. Crankshaft 33a. High pressure side piston 33b. Low pressure side piston 34a. High pressure side connecting rod 34b. Low pressure side connecting rod 35a. High pressure side cylinder 35b. Low pressure side cylinder 36a. High pressure side compression chamber 36b. Low pressure side compression chamber 37a. High pressure side crank arm 37b. Low pressure side crank arm 38. Bearing 39. Balancer 4. Tank part 41. Tanks 42a, 42b. Frame 43. 4. Elastic member Control circuit section 6. Handle 7. Rubber feet 8. Power switch 9. Power cord 10. Piping 11. Compressed air outlet 12. Pressure reducing valve 13. Pressure gauge

Claims (8)

A motor,
A compression mechanism driven by the motor;
A tank unit including an air tank for storing compressed air generated by the compression mechanism,
The motor is fixed to the tank part, and the compression mechanism is coupled to the tank part via an elastic member,
An air compressor comprising a rotation transmission member that transmits the rotational force of the motor to the compression mechanism even if the rotation shaft of the motor and the rotation shaft of the compression mechanism are misaligned.   The air compressor according to claim 1, wherein the rotation transmission member is a flexible coupling or a universal joint.   3. The air compressor according to claim 1, further comprising a piping part for delivering the compressed air generated by the compression mechanism to the air tank, wherein the piping part has elasticity.   The air compressor according to claim 3, wherein the pipe portion is a flexible tube.   The air compressor according to any one of claims 1 to 4, wherein the motor is not directly coupled to the compression mechanism except for transmission of a driving force.   The air compressor according to any one of claims 1 to 5, wherein the motor is fixed to the tank portion without an elastic member.   The air compressor according to claim 1, wherein the tank unit includes a frame that supports the air tank, and the compression mechanism is coupled to the frame.   The air compressor according to any one of claims 1 to 7, wherein the compression mechanism is a reciprocating compression mechanism.

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