JPH0510259A - Reciprocating compressor - Google Patents

Abstract

PURPOSE:To obtain a reciprocation type compressor which generates low noise and low vibration by constituting a cylinder so as to be integral with a piece of a tank and making the whole compact by the covering by the tank. CONSTITUTION:A piece 13b of a tank is shaped integrally with a cylinder 17 extending in the horizontal direction. The top edge of each piston rod is connected with piston pins 31 and 31, and the pistons 33 and 33 which move in reciprocation in the cylinders 17 and 17 are installed on these piston pins 31 and 31. The left and right pistons 33 and 33 in pair having a crankshaft 21 as center perform reciprocating movement towards the reverse directions each other by the revolution of the crankshaft 21 due to the revolution of a motor 5, and the vibration in operation can be reduced drastically.

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 working gas such as air or refrigerant.

[0002]

2. Description of the Related Art Conventionally, a reciprocating compressor which performs compression by reciprocating motion has been used as one of air compressors for producing compressed air, for example.

The basic construction of a compressor of this type compresses air by reciprocating a piston in a cylinder having an intake port and an exhaust port, and compresses this compressed air from an exhaust port of the cylinder through a pipe. It is sent to an air tank provided separately.

[0004]

However, in the reciprocating compressor having the above-mentioned conventional structure, the cylinder is substantially exposed to the outside and the number of parts and piping are large. Therefore, generation of peculiar noise and vibration is avoided. There was a problem that I could not.

Therefore, an object of the present invention is to provide a reciprocating compressor having low noise and low vibration by making the parts as common as possible and making the entire device compact.

[0006]

In order to solve the above problems, the invention according to claim 1 is such that a cylinder is integrally formed with one piece of a tank and is covered with the tank. The invention according to 2, further includes a configuration in which an air trap chamber that is airtight to the tank and communicates with the inside of the cylinder via an exhaust leaf valve is provided between the exhaust port of the cylinder and the tank. It was done.

[0007]

According to the present invention, the cylinder is composed of one piece of the tank and protrudes into the tank, and the compressed air discharged from the cylinder is directly stored in the tank without the need for piping. Therefore, piping from the cylinder to the tank is not required, and therefore, not only is the overall structure compact, but chattering noise is small.

Further, while the air trap chamber has airtightness with respect to the tank, and the inside of the cylinder is partitioned by the exhaust leaf valve, the airtightness with respect to the cylinder is incomplete. is there. Therefore, the air trap chamber functions as an automatic unloader and prevents the cylinder internal pressure from becoming too high and being unable to start when the apparatus is restarted from a stopped state.

[0009]

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

1 to 3 are a sectional view and a schematic perspective view of an air compressor 1 as one embodiment of the present invention, in which 3 is
The cover accommodates the motor 5, the starting capacitor 7, etc. inside, and has the handle 9 on the upper part and the leg 11 on the lower part.

In the lower part of the cover 3, two hollow air tanks 13, 13 having the same capacity are fixed and housed so as to face each other. Each of the air tanks 13 and 13 is configured by closely joining two air tank pieces 13a and 13b through a seal ring 15, and one of the pieces 13 is one of the air tank pieces 13a and 13b.
b is formed integrally with a cylinder 17 extending in the horizontal direction,
The cylinder 17 which also functions as a piece 13b of the air tank is projected 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 the invention 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 coincide with each other, 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). From the intake passage 86 that has been inserted,
Air cleaner 4 provided on the side of the air tank 13
The air purified by is taken in.

The motor 5 is housed in the cover 3 above the air tank 13 with the motor shaft 6 being vertical, and the motor shaft 6 drives a crankshaft 21 parallel to the motor shaft 6 via a gear 87. To do. The crankshaft 21 is rotatably sandwiched 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 are formed by joining two discs 23a, 23b with their centers displaced from each other, and the outer periphery of each disc is connected to the end portions of piston rods 27a, 27b, 29a, 29b extending in the horizontal direction. The integral rings 28a, 28b, 30a, 30b 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 the piston pins 31, 31, and these piston pins 31,
Pistons 33, 33 that reciprocate in the cylinders 17, 17 are attached to the cylinder 31, respectively. A pair of left and right pistons 3 centered on the crankshaft 21
The rotation of the crankshaft 21 associated with the rotation of the motor 5 causes the motors 3 and 33 to simultaneously reciprocate in opposite directions, so that vibrations during operation can be greatly reduced.

As shown in FIG. 5, each piston 33, 3 is
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 surfaces of these intake ports 39, 39. It is provided. The intake reed valve 37 is
The central portion is pressed by the intake valve pressing member 41 and is fixed to the piston head 34 with screws with the intake valve pressing member 41. As described above, since the intake reed valve 37 is provided inside the cylinder 17, there is an advantage that the generation of intake noise is small.

The intake valve pressing member 41 is a disk-shaped member having substantially the same diameter as that of the piston head 34, and the outer periphery thereof has a projecting edge 4 projecting toward the piston head 34.
5 is formed.

The protruding edge 45 is formed by the piston head 3
The seal ring 47 is fitted in the step portion 32 provided on the outer peripheral portion of 4, and the seal ring 47 is put in the groove formed between the step portion 32 and the step portion 32.

On the back surface (the surface on the piston head 34 side) of the intake valve pressing member 41, there is formed an inclined surface 49 which is smoothly rounded from the center. This inclined surface 4
The intake reed valve 37 is in close contact with the intake reed valve 37 in the open state to regulate the opening degree.

Like the piston head 34, two intake ports 51, 51 are provided on the diameter of the intake valve pressing member 41.
Is provided. These intake ports 51, 51 are connected to the intake reed valve 37 when the intake reed valve 37 is open.
In order to prevent the piston 33 from being blocked, the piston 33 is displaced and provided at a position outside the intake ports 39, 39. 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 ports 39, 51 provided in the piston 33 and the intake valve pressing member 41. Is inhaled from.

The cylinder head 53 of the cylinder 17 has two exhaust ports 55, 55 penetrating therethrough. An exhaust reed valve 57 similar to the intake reed valve 37 provided in the piston head 34 is provided at these exhaust ports 55,
Along with the exhaust valve pressing member 58 similar to the intake valve pressing member 41, it is screwed to the cylinder head 53 (see FIG. 6). In the embodiment shown in the drawings, the exhaust valve pressing member 58 is different from the intake valve pressing member 41.
It is attached by rotating it by 0 degrees.

A lid 59 is attached to each of the cylinder heads 53, 53, and the exhaust valve holding member 5 fixed to the inner surface of the lid 59 and the cylinder head 53.
An air trap chamber 61 is formed by the upper surface of 8. At the top of the lid 59, when the air pressure in the air trap chamber 61 exceeds a predetermined pressure, 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 for blocking the flow of air toward the air trap chamber 61. That is, the lid 5
The vent port 65 is provided at the top of the
A cylindrical portion 66 projecting from the periphery of the cylindrical portion 66 toward the inside of the air chamber 61, and an inward flange 67 provided at the tip of the cylindrical portion 66,
The valve 63 is connected to the inward flange 6 by the spring 69.
The seal O-ring 71 is interposed between the valve 63 and the inward flange 67.

The air trap chamber 61 of the above construction is provided between the exhaust port 55 of the cylinder 17 and the air tank 13 because 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 trap chamber 61 naturally leaks into the cylinder 17, so that the internal pressure rises too much and the piston does not operate at restart. This is to prevent it. 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 on the cylinder head 53 has an incomplete seal.

A fixing member 81 made of a U-shaped iron plate is provided at an appropriate position in the air tank 13, and a pressure detecting rod 8 is inserted so as to face the facing surface of the fixing member 81.
Pressure control switch 8 consisting of 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 becomes equal to or higher than a predetermined pressure.

The pressure detecting rod 83 has a protruding amount that continuously changes in accordance with a change in the balance between the biasing force of the spring 88 and the atmospheric pressure in the air tank 13, and constitutes the one air tank 13. It is directly attached to the air tank piece 13b. The button switch 85 is positionally adjustable in the operating direction of the pressure detecting rod 83.
It is attached to the air conditioner and is capable of adjusting the produced air pressure by adjusting the amount of protrusion in the direction of the detection rod 83.

In the compressor 1 constructed 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. . That is, when the pair of left and right pistons 33, 33 simultaneously move from the top dead center to the bottom dead center, the intake reed valve 37 provided on the piston head 34 is opened and the piston head 3 is opened.
4 and intake ports 39, 5 formed in the intake valve pressing member 41
Air is inhaled from 1. At this time, the cylinder head 53
The exhaust reed valve 57 provided at is closed.

When the pistons 33, 33 which have reached the bottom dead center are operated to the top dead center, the intake reed valve 37 of the piston head 34 is closed while the air pressure in the cylinders 17, 17 rises and the cylinder head is closed. Since the exhaust reed valve 57 of 53 is in the open state, 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 exceeds a 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 pressure detecting rod 83 directly attached to the air tank piece 13b.
The amount of protrusion of is continuously changed. Then, when the tip of the pressure detection rod 83 presses the button switch 85, the operation of the motor 5 is stopped. Button switch 85 and pressure detection rod 83
Since the interval between and is appropriately determined by adjusting the protrusion amount of the button switch 85 attached to the fixing member 81, the magnitude of the air pressure taken out can be easily controlled.

In the structure of the above-mentioned embodiment, since the parts used on the left and right with the crankshaft 21 as the central axis are all common, there is an advantage that the mass productivity is high and the manufacturing cost can be suppressed.

In the above description, the present invention has been described using the compressor having two cylinders and two pistons and symmetrical with respect to the crankshaft. It goes without saying that it can be applied to a compressor having one piston each.

The compressor having the structure of the present invention is particularly suitable for applications such as bed lift devices, which are used intermittently or have a small capacity, and in which heat generation does not pose a problem.

[0033]

According to the present invention, since the cylinder and the tank are integrated, the number of parts is small and the cost is low. In addition, since there is no piping and all the accessories of the compressor can be assembled inside, there is little chattering noise, operation with low vibration and noise is possible, and maintenance is easy. Further, since the tank is incorporated in the compressor, the entire device is compact and has a good appearance.

[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 a compressor of the present invention.

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

FIG. 5 is a cross-sectional view near a piston head.

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

[Explanation of symbols]

13 tanks 13a, 13b Tank pieces 17 cylinders 55 Exhaust port 57 Exhaust leaf valve 61 Air trap chamber

Claims (2)

[Claims] 1. The cylinder 17 is a piece 13b of the tank 13.
A reciprocating compressor which is integrally formed with the tank 13 and is covered with the tank 13. 2. The exhaust port 55 of the cylinder 17 and the tank 13
The reciprocating system according to claim 1, characterized in that an air trap chamber (61) having airtightness with respect to the tank (13) and communicating with the inside of the cylinder (17) via an exhaust leaf valve (57) is provided between the reciprocating type and the tank. Compressor.