JPH051871U - Reciprocating compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a low noise reciprocating compressor with less vibration caused by the operation of a piston. [Structure] Cylinders 17, 17 are provided horizontally opposite to each other on both left and right sides of a crankshaft 21, and the cylinders 17, 1 are provided.
7 accommodates pistons 33, 33 which are simultaneously actuated in opposite directions via crank mechanisms 27, 28, 29, 30, 31 by rotation of the crankshaft 21, respectively, and actuated by the respective pistons 33, 33. The intake amount and the exhaust amount were the same on both sides of the crankshaft 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reciprocating compressor that compresses a working gas such as air or a refrigerant.

[0002]

[Prior Art]

 Conventionally, a reciprocating compressor that performs compression by reciprocating motion has been used as one of the air compressors that generate compressed air, for example.

The basic structure of this type of compressor is that the piston reciprocates in a cylinder having an intake port and an exhaust port to compress air, and the compressed air is discharged from the exhaust port of the cylinder. It is sent through a pipe to an air tank provided separately.

[0004]

[Problems to be solved by the device]

 However, the reciprocating compressor having the above-mentioned conventional structure has a problem that the vibration of the piston is intense and the noise is unavoidable.

Therefore, an object of the present invention is to provide a reciprocating compressor with low vibration and low noise.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides horizontally opposed cylinders on the left and right sides of a crankshaft, and the cylinders are simultaneously operated in opposite directions by a crank mechanism by rotation of the crankshaft. Each of the pistons is housed, and the intake amount and the exhaust amount due to the operation of each piston are the same on both sides of the crankshaft.

[0007]

[Action]

 According to the compressor of the present invention, the left and right pistons act in opposite directions at the same time with the crankshaft as the central axis, and the intake and exhaust amounts by both pistons are the same. This holds true, and the vibrations generated by the operation of the pistons cancel each other out.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 are a cross-sectional view and a schematic perspective view of a compressor 1 of the present invention, in which reference numeral 3 houses a motor 5, a starting capacitor 7 and the like inside, and a handle 9 on the upper part and a lower part. It is a cover having a leg portion 11 at the bottom.

In the lower part of the cover 3, two hollow air tanks 13 having the same capacity are fixed and housed so as to face each other. Each of the air tanks 13 and 13 is formed by closely joining two air tank pieces 13a and 13b through a seal ring 15, and one piece 13b of the air tank pieces 13a and 13b is integrally formed with a cylinder 17 extending in the horizontal direction. Then, the cylinder 17 which also functions as one piece 13b of the air tank is inserted into the inside of the air tank 13. In the embodiment shown in the drawings, the cylinder 17 is provided concentrically with the air tank 13 for the convenience of machining, but the embodiment is not limited to this.

The two left and right air tanks 13, 13 configured as described above are back-to-back so that the cylinder centers of the respective cylinders 17 are aligned, and are joined and fixed by appropriate means such as bolts, and the communication passage 14 Are in communication with each other. The bases of the cylinders 17, 17 also serve as the crank chamber 19, and the crank chamber 19 is formed on the mating surfaces of the left and right cylinders 17, 17 and has an appropriate check valve (not shown). The air purified by the air cleaner 4 provided on the side of the air tank 13 is taken in from the intake passage 86 in which the air is inserted.

The motor 5 is housed in a cover 3 above the air tank 13 with the motor shaft 6 being vertical, and the motor shaft 6 has a crank shaft 21 parallel to the motor shaft 6 via a gear 87. To drive. The crankshaft 21 is rotatably held by the mating surfaces of the joined cylinders 17, 17. Therefore, the cylinders 17 and 17 and the air tanks 13 and 13 can be completely symmetrical with respect to the crankshaft 21 in terms of shape and volume.

Two eccentric crank members 23, 23 are mounted on the crankshaft 21 so as to be positioned at the center of the crank chamber 19 by vertically facing and superposing and fixing them (see FIG. 4). ). The crank members 23, 23 have a shape in which two discs 23a, 23b are joined with their centers displaced from each other, and the outer periphery of each disc has the ends of horizontally extending piston rods 27a, 27b, 29a, 29b. Rings 28a, 28b, 30a, 30b which are integral with the unit are mounted via bearings, respectively. In the embodiment shown in the drawings, the piston rods 27a, 27b attached to the outer two discs 23a, 23a extend to the right in the figure, and the piston rods 29a, 29b attached to the inner two discs 23b, 23b. Are supposed to extend to the left side of the figure.

The tip of each piston rod is connected to piston pins 31 and 31, and pistons 33 and 33 that reciprocate in the cylinders 17 and 17 are attached to these piston pins 31 and 31, respectively. The pair of left and right pistons 33, 33 centering on the crankshaft 21 simultaneously reciprocate in opposite directions due to the rotation of the crankshaft 21 accompanying the rotation of the motor 5, so that vibrations during operation Can be significantly reduced.

As shown in FIG. 5, the piston heads 34, 34 of the respective pistons 33, 33 are respectively provided with two intake ports 39, 39 at positions equidistant from the center on their diameters. An intake reed valve 37 is provided on the upper surface of the intake ports 39, 39. The intake reed valve 37 is pressed at its central portion by an intake valve pressing member 41, and is fixed to the piston head 34 together with the screw by screws. As described above, since the intake reed valve 37 is provided inside the cylinder 17, there is an advantage that the intake noise is less generated.

The intake valve pressing member 41 is a disk-shaped member having substantially the same diameter as the piston head 34, and a protrusion edge 45 protruding in the direction of the piston head 34 is formed on the outer periphery thereof.

The projecting edge 45 is adapted to the step portion 32 provided on the outer peripheral portion of the piston head 34, and the seal ring 47 is inserted in the groove formed between the projecting edge 45 and the step portion 32. There is.

Further, on the back surface (the surface on the piston head 34 side) of the intake valve pressing member 41, an inclined surface 49 having a smooth radius from the center is formed. The intake reed valve 37 is in close contact with the inclined surface 49 in the open state to regulate the opening.

As with the piston head 34, two intake ports 51, 51 are provided on the diameter of the intake valve pressing member 41. These intake ports 51, 51 are provided so as to be offset from the intake ports 39, 39 of the piston 33 so as not to be blocked by the intake reed valve 37 when the intake reed valve 37 is open. .. As a result, when the piston 33 moves from the top dead center to the bottom dead center, the intake reed valve 37 is opened and the air in the crank chamber 19 is sucked into the intake port 39 provided in the piston 33 and the intake valve pressing member 41. Inhaled from 51.

Two exhaust ports 55, 55 are formed through the cylinder head 53 of the cylinder 17. An exhaust reed valve 57 similar to the intake lead valve 37 provided in the piston head 34 is provided at these exhaust ports 55, and together with the exhaust valve holding member 58 similar to the intake valve holding member 41, the cylinder It is screwed to the head 53 (see FIG. 6). In the embodiment shown in the drawings, the exhaust valve holding member 58 is attached to the intake valve holding member 41 by rotating 90 degrees from the intake valve holding member 41.

A lid 59 is attached to each of the cylinder heads 53, 53, and an air trap chamber 61 is formed by an inner surface of the lid 59 and an upper surface of the exhaust valve pressing member 58 fixed to the cylinder head 53. Has been done. At the top of the lid 59, when the air pressure in the air trap chamber 61 becomes a predetermined pressure or more, the lid 59 is opened to discharge the air in the air trap chamber 61 to the air tank 13 and A check valve 63 is provided to block the flow of air from 13 toward the air trap chamber 61. That is, the vent port 65 is provided at the top of the lid 59, and the tubular part 66 is provided so as to project from the periphery of the vent port 65 toward the inside of the air trap chamber 61, and the tip of the tubular part 66 faces inward. A flange 67 is provided, the valve 63 is biased toward the inward flange 67 side by a spring 69, and a sealing O-ring 71 is interposed between the valve 63 and the inward flange 67.

The air trap chamber 61 having the above-described structure is provided between the exhaust port 55 of the cylinder 17 and the air tank 13. The exhaust reed valve 57 provided in the cylinder head 53 has a very good sealing property. Since it is not a thing, when the operation of the piston 33 is stopped, the compressed air in the air trap chamber 61 naturally leaks into the cylinder 17, so the cylinder internal pressure rises too much and the piston does not operate at restart. This is to prevent this. That is, the air trap chamber 61 is provided so as to act as an unloader by utilizing the fact that the exhaust reed valve 57 provided in the cylinder head 53 has an incomplete seal.

In the above-mentioned configuration, since all parts used on the left and right sides centering on the crankshaft 21 are common, the number of parts can be small, the mass productivity is high, and the manufacturing cost can be reduced.

A fixing member 81 made of a U-shaped iron plate is provided at an appropriate position of the air tank 13, a pressure detecting rod 83 and a button switch 85 are inserted so as to face opposite surfaces of the fixing member 81, respectively. Is provided with a pressure control switch 80. The pressure control switch 80 stops the operation of the motor 5 when the air pressure in the air tank 13 becomes a predetermined pressure or more.

The pressure detecting rod 83 has a protruding amount that continuously changes according to a change in the balance between the biasing force of the spring 88 and the atmospheric pressure in the air tank 13. Is directly attached to the air tank piece 13b constituting the. The button switch 85 is attached to the fixing member 81 so that the position thereof can be adjusted in the operating direction of the pressure detection rod 83, and the air pressure produced by adjusting the amount of protrusion in the detection rod 83 direction is adjusted. Is possible.

In the compressor 1 configured as described above, first, the air purified by the air cleaner 4 and supplied into the crank chamber 19 is sucked into the cylinder by the piston 33 operated by the drive of the motor 5. To be done. That is, the pair of left and right pistons 33, 33 move from top dead center to bottom dead center at the same time, so that the intake reed valve 37 provided in the piston head 34 opens and the piston head 34 and the intake valve pressing member 41 are opened. Air is taken in through the intake ports 39, 51 penetrating therethrough. At this time, the exhaust reed valve 57 provided on the cylinder head 53 is in a closed state. When the pistons 33, 33 that have reached the bottom dead center operate to the top dead center, the intake lead valve 37 of the piston head 34 is closed while the pressure in the cylinders 17, 17 rises and the cylinder head 53 is closed. Since the exhaust reed valve 57 is opened, the air sucked into the cylinders 17, 17 is discharged from the exhaust ports 55, 60 penetrating the cylinder head 53 and the exhaust valve holding member 58 into the air trap chamber 61. Pumped to.

When the air pressure in the air trap chamber 61 becomes equal to or higher than the predetermined pressure as described above, the compressed air in the air trap chamber 61 resists the urging force of the spring 69 and the check valve 63 provided on the lid 59. Open and flow into the air tanks 13, 13. The air in the air tanks 13, 13 does not flow back toward the air trap chamber 61 due to the action of the check valve 63.

As the atmospheric pressure in the air tank 13 changes, the protrusion amount of the pressure detection rod 83 directly attached to the air tank piece 13b continuously changes. The operation of the motor 5 is stopped when the tip of the pressure detection rod 83 presses the button switch 85. The distance between the button switch 85 and the pressure detection rod 83 is appropriately determined by adjusting the protrusion amount of the button switch 85 attached to the fixing member 81. Therefore, the magnitude of the air pressure to be taken out can be easily controlled. You can

In the above embodiment, since the left and right cylinders are integrally molded with one piece of the air tank and covered with the air tank, no piping is required, the entire apparatus becomes compact, and chatter noise is generated. Less is. Moreover, since the left and right air tanks have the same shape and capacity, the compressed air produced can be balanced.

Further, the compressor having the configuration of the illustrated example is particularly suitable for a bed lift device or the like, which is used intermittently or has a small capacity and in which heat generation is not a serious problem.

[0031]

[Effect of the device]

 According to the present invention, a mechanically perfect balance is established on both sides of the crankshaft, so that the vibrations generated by the piston operation cancel each other out, and the vibrations generated by the compressor as a whole are significantly reduced. is there.

Further, since the parts used on both sides of the crankshaft are all common, the number of kinds of parts is small, mass production is excellent, and manufacturing costs are reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a compressor of the present invention.

FIG. 2 is a cross-sectional plan view showing an embodiment of the compressor of the present invention.

FIG. 3 is an overall schematic perspective view showing an embodiment of the compressor of the present invention.

FIG. 4 is a perspective view showing a configuration inside a crank chamber.

FIG. 5 is a sectional view of the vicinity of a piston head.

FIG. 6 is an exploded perspective view of the vicinity of a cylinder head.

[Explanation of symbols]

 17 Cylinder 21 Crank Shaft 27, 28, 29, 30, 31 Crank Mechanism 33 Piston

Claims (1)

[Claims for utility model registration] 1. Cylinders 17, 17 are provided horizontally opposite each other on the left and right sides of a crankshaft 21, and each cylinder 1
Pistons 33 and 33, which are simultaneously operated in opposite directions via crank mechanisms 27, 28, 29, 30 and 31 by the rotation of the crankshaft 21, are housed in 7 and 17, respectively. A reciprocating compressor characterized in that the intake air amount and the exhaust air amount due to operation are the same on both sides of the crankshaft 21, respectively.