JP2569498Y2 - Reciprocating 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 reciprocating compressor for compressing a working gas such as air or refrigerant.

[0002]

2. Description of the Related Art Conventionally, a so-called horizontally opposed reciprocating pressure has been used as one type of air compressor for producing compressed air.
Compactors are known.

A compressor of this type is disclosed , for example, in
As disclosed in Japanese Patent No. 36243, the crankshaft
Cylinders are provided on both left and right sides of the shaft so as to face each other.
The rotation of the crankshaft causes
Pistons that operate simultaneously in opposite directions via a locking mechanism
Respectively. And such compression
According to the machine, the pistons move back and forth on the same axis.
The compression process is performed simultaneously, so compression is performed alternately on the left and right.
The vibration is significantly lower than that of a conventional compressor that performs a stroke.
It is said that it can be reduced.

[0004]

[Problem to be solved by the invention ]
In a horizontally opposed compressor having a conventional configuration as described above, compressed air
Are installed separately through pipes from the exhaust port of each cylinder.
To be stored in the air tank
The cylinder is substantially exposed to the outside,
The number and plumbing are so large that the noise,
There were problems such as inevitable generation of vibration.

Therefore, the present invention uses common parts as much as possible.
And making the entire system compact
To provide a low noise, low vibration reciprocating compressor
Things.

[0006]

In order to solve the above problems, a reciprocating compressor according to the present invention is provided with horizontally opposed cylinders on both left and right sides of a crankshaft. Pistons which are simultaneously operated in opposite directions by rotation through a crank mechanism are respectively housed, and the intake and exhaust volumes due to the operation of each piston are the same on both sides of the crankshaft.
A reciprocating compressor, wherein the cylinder is the cylinder.
Molded integrally with the tank that stores the gas discharged from the
It is configured to be covered by a tank.

[0007]

According to the compressor of the present invention, the left and right pistons simultaneously operate in opposite directions about the crankshaft as a central axis,
Since the intake and exhaust volumes by both pistons are the same,
The balance is established mechanically on both sides of the crankshaft, and the vibrations caused by the operation of the pistons cancel each other. In addition, since the cylinder is not exposed to the outside,
Less noise and vibration, and moreover, cylinder and tank
Are integrally formed, and the cylinder
Since piping from the tank to the tank is not required, the entire device
It can be made compact and the number of parts can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are a sectional view and a schematic perspective view of a compressor 1 of the present invention. In the drawings, a motor 3 and a starting capacitor 7 are accommodated therein, and a handle 9 is provided at an upper portion and a handle 9 is provided at a lower portion. It is a cover having legs 11.

In the lower portion of the cover 3, two hollow air tanks 13, 13 of the same capacity are fixedly opposed to each other and accommodated. Each of the air tanks 13, 13 is formed by closely joining two air tank pieces 13a, 13b via a seal ring 15, and one of the pieces 13a, 13b is provided.
b is formed integrally with the cylinder 17 extending in the horizontal direction,
A cylinder 17 also serving as a piece 13b of the air tank protrudes into 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 is not limited to this.

The two left and right air tanks 13 and 13 constructed as described above are back-to-back so that the cylinder cores of the respective cylinders 17 coincide with each other, and are joined and fixed by appropriate means such as bolts. Are communicated with each other. The bases of the cylinders 17 and 17 also serve as a crank chamber 19. The crank chamber 19 is formed on a mating surface of the left and right cylinders 17 and 17 and has an appropriate check valve (not shown). From the intake passage 86 interposed
Air cleaner 4 provided on the side of the air tank 13
The purified air is taken in.

The motor 5 is housed in the cover 3 above the air tank 13 with the motor shaft 6 vertical, and the motor shaft 6 drives a crankshaft 21 parallel to the motor shaft 6 via a gear 87. I do. The crankshaft 21 is rotatably sandwiched between mating surfaces of the joined cylinders 17 and 17. Therefore, the cylinders 17, 17 and the air tanks 13, 13 can be completely symmetrical with respect to the crankshaft 21 in terms of shape and volume.

On the crankshaft 21, two eccentric crank members 23, 23 are mounted so as to be positioned in the center of the crank chamber 19 while being vertically opposed and superposed and fixed (see FIG. 4). ). The crank members 23, 23 are formed by joining two disks 23a, 23b with their centers shifted from each other. The outer periphery of each disk has ends of piston rods 27a, 27b, 29a, 29b extending horizontally. And rings 28a, 28b, 30a, and 30b integral with each other via bearings. In the embodiment shown in the drawings, the piston rods 27a, 27b attached to the two outer disks 23a, 23a extend to the right in the figure, and the piston rods 29a, 29b attached to the two inner disks 23b, 23b. Extend to the left side of the figure.

The distal ends of the piston rods are connected to piston pins 31 and 31, respectively.
Pistons 33, 33 which reciprocate in the cylinders 17, 17 are attached to 31, respectively. A pair of left and right pistons 3 centered on the crankshaft 21
Since the motors 3 and 33 reciprocate simultaneously in the opposite directions due to the rotation of the crankshaft 21 accompanying the rotation of the motor 5, vibration during operation can be significantly reduced.

As shown in FIG. 5, each of the pistons 33, 3
The three piston heads 34, 34 are respectively provided with two intake ports 39, 39 at positions equidistant from the center on the diameter thereof, and an intake reed valve 37 is provided on the upper surface of these intake ports 39, 39. Is provided. The intake reed valve 37 is
The central portion is pressed by the intake valve holding member 41, and is screwed and fixed to the piston head 34 together with the intake valve holding member 41. Thus, since the intake reed valve 37 is provided inside the cylinder 17, there is an advantage that generation of intake noise is small.

The intake valve holding member 41 has a disk shape having substantially the same diameter as the piston head 34, and has a protruding edge 4 protruding in the direction of the piston head 34 on its outer periphery.
5 are formed.

The protruding edge 45 is connected to the piston head 3
The seal ring 47 is fitted in a groove formed between the step 32 and the step 32 provided on the outer periphery of the step 4.

On the back surface (the surface on the side of the piston head 34) of the intake valve holding member 41, an inclined surface 49 is formed which has a smooth radius from the center. This slope 4
9, the intake reed valve 37 is in close contact with the open state, and the opening degree is regulated.

On the diameter of the intake valve holding member 41, two intake ports 51, 51 are provided similarly to the piston head 34.
Is provided. These intake ports 51, 51 are provided so as to be shifted to positions outside the intake ports 39, 39 of the piston 33 so as not to be closed by the intake reed valve 37 when the intake reed valve 37 is in the open state. . 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 filled with the intake ports 39, 51 provided in the piston 33 and the intake valve holding member 41. It is sucked from.

The cylinder head 53 of the cylinder 17 is provided with two exhaust ports 55, 55. An exhaust reed valve 57 similar to the intake reed valve 37 provided in the piston head 34 is provided in these exhaust ports 55,
An exhaust valve holding member 58 similar to the intake valve holding member 41 is screwed to the cylinder head 53 (see FIG. 6). In the embodiment shown in the drawings, the exhaust valve holding member 58 is 9
Turned 0 degrees and attached.

A cover 59 is attached to each of the cylinder heads 53, 53, and the inner surface of the cover 59 and the exhaust valve pressing member 5 fixed to the cylinder head 53 are respectively provided.
An air pocket 61 is formed by the upper surface of the chamber 8. The top of the lid 59 is opened when the air pressure in the air chamber 61 becomes equal to or higher than a predetermined pressure, and discharges the air in the air chamber 61 to the air tank 13. A check valve 63 is provided for preventing the flow of air in the direction of the stagnation chamber 61. That is, the lid 5
9 is provided with a vent port 65 at the top thereof.
A cylindrical portion 66 is protruded from the periphery of the chamber toward the inside of the air reservoir 61, and an inward flange 67 is provided at a tip of the cylindrical portion 66,
The valve 63 is moved by the spring 69 to the inward flange 6.
7 and an O-ring 71 for sealing is interposed between the valve 63 and the inward flange 67.

The reason why the air reservoir 61 having the above-described structure is provided between the exhaust port 55 of the cylinder 17 and the air tank 13 is that the exhaust reed valve 57 provided in the cylinder head 53 has a very good sealing property. Therefore, when the operation of the piston 33 is stopped, the compressed air in the reservoir chamber 61 naturally leaks into the cylinder 17, so that the cylinder internal pressure becomes too high and the piston does not operate at restart. This is to prevent That is, the air pool 61
Is provided to operate the unloader by utilizing the incomplete sealing of the exhaust reed valve 57 provided in the cylinder head 53.

In the above configuration, the parts used on the left and right sides with respect to the crankshaft 21 are all common, so that the number of parts is small and the mass productivity is high.
The manufacturing cost can be reduced.

At an appropriate position of the air tank 13, a fixing member 81 made of a U-shaped iron plate and a pressure detecting rod 8 inserted into the opposing surface of the fixing member 81, respectively.
Pressure control switch 8 comprising 3 and button switch 85
0 is provided. The pressure control switch 80 stops the operation of the motor 5 when the air pressure in the air tank 13 exceeds a predetermined pressure.

The pressure detecting rod 83 has a protruding amount which continuously changes in accordance with a change in the balance between the urging force of the spring 88 and the air pressure in the air tank 13. Is directly attached to the air tank piece 13b. The button switch 85 is configured so that the position of the button switch 85 can be adjusted in the operating direction of the pressure detection rod 83.
The air pressure generated by adjusting the amount of protrusion in the direction of the detection rod 83 can be adjusted.

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 driving the motor 5. . That is, the pair of left and right pistons 33, 33 simultaneously moves from the top dead center to the bottom dead center, whereby the intake reed valve 37 provided on the piston head 34 is opened and the piston head 3
4 and intake ports 39, 5 penetrating through the intake valve holding member 41.
Air is sucked from 1. At this time, the cylinder head 53
Is in a closed state. When the pistons 33, 33 which have reached the bottom dead center operate to the top dead center, the intake reed valve 37 of the piston head 34 is closed, while the pressure in the cylinders 17, 17 rises and the exhaust of the cylinder head 53 is exhausted. Since the reed valve 57 is opened, the air sucked into the cylinders 17, 17
Exhaust ports 55, 60 provided through the cylinder head 53 and the exhaust valve holding member 58 feed the air into the air pocket 61.

As described above, when the air pressure in the air chamber 61 becomes equal to or higher than the predetermined pressure, the compressed air in the air chamber 61 is subjected to the check valve 63 provided on the lid 59 against the urging force of the spring 69. And flows into the air tanks 13, 13. The air in the air tanks 13, 13 does not flow backward in the direction of the stagnation chamber 61 due to the action of the check valve 63.

As the air pressure in the air tank 13 changes, the pressure detecting rod 83 directly attached to the air tank piece 13b
Continuously changes. Then, when the tip of the pressure detection rod 83 presses the button switch 85, the operation of the motor 5 stops. Button switch 85 and pressure detection rod 83
Is appropriately determined by adjusting the amount of protrusion of the button switch 85 attached to the fixing member 81, so that the magnitude of the extracted air pressure can be easily controlled.

In the above embodiment, since the left and right cylinders are formed integrally with one piece of the air tank and covered with the air tank, piping is unnecessary, the whole apparatus becomes compact, and chattering noise is generated. Few. Moreover, since the left and right air tanks have the same shape and capacity, the generated compressed air can be balanced.

The compressor having the configuration shown in the figure is particularly suitable for applications in which intermittent use or small capacity, such as for a bed lift device, is not so problematic in heat generation.

[0031]

According to the invention present invention, since a complete balance machine 構的 on both sides of the crankshaft are established, vibration generated by the operation of the piston is countered each other, the vibration is much generated overall compressor that a little. In particular,
Noise and vibration are lower because the solder is not exposed to the outside.
Is reduced.

The cylinder and the tank are integrally formed.
And that the cylinder-to-tank distribution
Since the tube is not required, the whole device can be made compact.
To provide an inexpensive compressor with a small number of parts.
There is fruit.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the 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 one 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 near a piston head.

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

[Description of Signs] 13 Tank 17 Cylinder 21 Crankshaft 27, 28, 29, 30, 31 Crank mechanism 33 Piston

Claims (1)

(57) [Scope of request for utility model registration] 1. A right and left sides of the crankshaft (21) of the cylinder (17, 17) provided on the horizontally opposed shape, the respective cylinder (17, 17) in the crankshaft (2
1 ), the crank mechanism ( 27, 28, 29, 3)
0,31 ) , the pistons ( 33,33 ) operating simultaneously in opposite directions to each other are accommodated, respectively.
A reciprocating compressor in which the amount of intake and the amount of exhaust by the operation of ( 33, 33 ) are the same on both sides of the crankshaft ( 21 ) , respectively , wherein the cylinder (17, 17) comprises:
The gas discharged from the cylinder (17, 17) is stored.
Tank (13, 13) and formed integrally with the tank (1).
A reciprocating compressor covered by (3, 13) .