JPS58210381A - Air compressor - Google Patents

Abstract

PURPOSE:To reduce knocking sound of a driven gear to a drive gear by discharging compressed air between the upper surface of a piston in the neighborhood of the upper dead point of a piston and a cylinder head through a suction slit formed in a rotary valve. CONSTITUTION:Compressed air in a space 2c of a cylinder 2 at the neighborhood of the upper dead point of a piston 4 is exhausted at every rotation of a crankshaft 3 through a suction hole 5d of a cylinder head 5 and suction slit 6d of a rotary valve 6 from a suction port 5b of the cylinder head 5. Thus, the remaining pressure in the space 2c of the cylinder 2 is fairly reduced and knocking sound of a driven gear 12 to a drive gear to reduce running sound of a compressor 1. Also, since positions of suction slit 6d and discharge slit 6e of the rotary valve 6 can be changed freely, timing of suction and discharge can be freely selected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a reciprocating type near compressor [%! D,% relates to a near compressor that discharges compressed air between the upper surface of the screw top near the top dead center of the piston and the cylinder and Rad from the worker boat with a simple structure.

Conventionally, in near compressors, when the piston enters the downward stroke from top dead center, the residual pressure generated by compressed air remaining in the space formed between the top surface of the piston and the cylinder head, the so-called dead volume area,
The piston is pushed down, the rotational speed of the near compressor is accelerated, and the rigidity of the driven gear hits the opposite side of the normal engagement screen of the driving gear, causing a knocking noise between the driven gear and the driving gear. In order to prevent this phenomenon, it was rarely necessary to exhaust the compressed air remaining in the dead volume to the outside, but this was technically difficult for monks to do.

In addition, in the suction valve device and discharge valve device of a conventional near compressor, the ridge valve and the discharge valve are designed to reciprocate against the compression spring of the top and bottom, so each time the suction valve device and the discharge valve device operate, noise is generated and the valve is activated. It has the disadvantage that it is easily worn out and has relatively low durability. Furthermore, there is an inconvenience that the timing of inhalation and exhalation is mechanically limited and cannot be changed freely.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to provide a suction slit and a discharge slit in the cylinder head that function as a suction valve and a discharge valve, respectively. By installing a rotary pulp with a suction slit, the compressed air between the top surface of the piston and the cylinder head near the top dead center of the piston is discharged to the outside through the suction slit, reducing the sound of the driven gear hitting the driving gear. The objective is to reduce the operating noise of the near compressor. Another purpose is to eliminate the operating noise of the pulp during suction and exhalation and to improve the durability of the pulp. Still another object is to enable the timing of inhalation and exhalation to be freely selected.

In short, the present invention includes a cylinder in which a cylindrical hollow part is formed, a crankshaft rotatably supported by the skeleton cylinder, a piston connected to the crankshaft and fitted into the hollow part of the cylinder, A near compressor equipped with a cylinder head in which a suction hole and a discharge hole communicating with the hollow part of the La cylinder are formed on the upper surface of the cylinder, and a cylinder head is formed with a suction port and a discharge port, respectively, which are open to the outside. The cylinder head may have a cylindrical hollow portion that communicates with the suction hole and the discharge hole and the suction port and the discharge port, respectively, and the suction hole and the suction port may communicate with the hollow portion. A rotary pulp having a suction slit and a discharge slit that allows communication between the discharge hole and the discharge port is inserted, and the rotary pulp rotates in conjunction with the crankshaft, and when the piston is raised, the rotary pulp is inserted. The compressed air between the top surface of the piston and the cylinder head is discharged toward the air tank through the discharge hole of the cylinder head, the discharge slit of the rotary pulp, and the discharge port, and the compressed air is discharged near the top dead center of the piston. It is characterized in that it is configured to be discharged to the outside through the suction hole of the cylinder head, the suction slit for the rotary pulp, and the suction port.

The present invention will be explained below based on embodiments shown in the drawings. The near compressor 1 according to the present invention includes a cylinder 2, a crankshaft 3, a piston 4, a cylinder head 5,
The rotary pulp 6 and the pressure regulating device 7 are provided, and the cylinder 2 is formed in a cylindrical shape, and has a cylindrical hollow portion 2a penetrating in the vertical direction in the figure.

The crankshaft 3 includes a crank pin 3a and crank journals 3 formed on both left and right sides of the crank pin in the figure.
b, 3c and the crankshaft crankbin 3a
and a crank journal 3b.

3C is a pair of bearings 11 attached to the crankcase 1o
, 11 for rotation.

A driven gear 12 that meshes with a drive gear (not shown) is fixed to the end of the left crank jar 43b.
In conjunction with the rotation of the driving gear, the crankshaft 3 rotates clockwise from the right side in FIG. 1 via the driven gear 12. Also, the right crank journal 3c protrudes outward from the crankcase 1o.
A subblock 3f is formed at the end of the small diameter portion 3e.

The piston 4 is formed into a cylindrical shape, and a piston ring 13 is fitted into the outer periphery of the piston to form a hollow part 2a of the cylinder 2.
It is fitted into the inner circumferential surface 2b of the piston.
The connecting rod 17 is connected to the crankshaft 3 by a piston pin 16 which is supported by a piston pin 5 with limited axial movement, and by a connecting rod 17 whose both ends are fitted into the crank pin 3a of the crankshaft 3, respectively. Therefore, as the crankshaft 3 rotates, the piston 4 moves into the hollow part 2 of the cylinder 2.
The inner circumferential surface 2b of a can be slid downward by one step.

The cylinder head 5 is attached to the upper surface of the cylinder 2, and a cylindrical hollow part 5a with one end open is formed in the cylinder head. The cylinder head 5 also includes an intake port (5b) having one end communicating with the hollow part 5a of the cylinder head and the other end opening outward, and an air tank (not shown) having one end communicating with the hollow part 5a and the other end. Discharge ports 5c are formed in opposite directions and communicate with the hollow portion 2a of the main cylinder 2 and the hollow portion 5a of the cylinder head 5, respectively, and communicate with the suction port 5b via the hollow portion 5a. A suction hole 5d is formed which communicates with the cylinder 2, and a discharge hole 5e is formed which communicates with the hollow part 2a of the cylinder 2 and the hollow part 5a of the cylinder head 5, respectively, and communicates with the discharge port 5c via the hollow part 5a. ing.

The rotary pulp 6 is composed of a main body 6a and a shaft portion 6b. Pushy 21 press-fitted into the inner peripheral surface of the hollow part 5a
is inserted into.

Holes 21a and 21b are formed in the pusher and communicate with the suction hole 5d and discharge hole 5e of the cylinder head 5, respectively. Further, on the outer circumferential surface of the main body 6a, a suction slit 6d and a discharge slit e are chamfered at positions that can face the suction hole 5d and the discharge hole 5e of the cylinder head 5 and are on opposite sides of each other. are formed respectively. Main body 6af
) A recess 6f is formed on the left end surface in the figure, a thrust bearing 22 is embedded in the recess, and a compression spring 23 is installed between the bearing and the hollow part 5a of the cylinder head 5. 22 is housed so as to press and bias it. The shaft portion 6b is formed to protrude rightward from the right end surface of the main body 6a in the figure, and is fitted into a lid member 25 that is press-fitted to close the right end of the hollow portion 5a. Nuclear lid member and main body 6a
An I receiver 26 and a washer 27 are fitted onto the shaft portion 6b between them, and the main body 6a is always pressed rightward in the figure by the compression spring 23. A sprocket 6g, which is the same as the sprocket 3f of the crankshaft 3, is formed at the end of the shaft portion 6b projecting outward from the cylinder head 5. Between these sprockets, there are teeth and a belt 3.
0 is installed.

When the crankshaft 3 rotates, the rotary pulp 6 becomes the sprocket) 3f, 6g and the toothed bell) 30.
The piston 4 rotates through the piston 4 when the piston 4 rises.
The compressed air between the upper surface and the cylinder head 5 is discharged from the discharge port 5Cd to an air tank (not shown) via the discharge hole 5e of the cylinder head and the discharge sling 6e of the rotary pulp 6, and the The compressed air between the upper surface of the piston 4 and the cylinder head 5 is discharged to the outside from the suction port 5b via the suction hole 5d of the wrinkled cylinder head and the suction suction 6d of the rotary pulp 6.

The pressure regulator 7 includes a valve 32, and the valve regulator is rotatably disposed between a hole 33 communicating with the suction hole 5d and a hole 34 communicating with the suction port 5b. It has a communication hole 32a bent at a right angle, and is configured to connect or close the holes 33 and 34 by rotating the communication hole, so that the pressure of the compressed air in the air tank is constant. When the value exceeds the value, an actuator (not shown) such as an air cylinder or an electromagnetic solenoid is activated, and the control valve 32 is rotated to a position where the holes 33 and 34 are communicated with each other. Of course, the regulating valve 32 may also be of the relief pulp type with a pulp spring or the like.

The present invention is constructed as described above, and its operation will be explained below. The driven gear 12 is driven by the driving gear 9 times (then the crankshaft 3 rotates and the connecting rod 1
7, the piston 4 slides vertically on the inner circumferential surface 2b of the hollow portion 2a of the cylinder 2, and the rotary valve 6 rotates via the sprockets 3f, 6g and the toothed belt 30. At the beginning of the upward stroke of the piston 4, as shown in FIGS. 4 and 5, the suction hole 5d and the suction port 5b, and the discharge hole 5e and the discharge port 5C are in a state where they are not communicated with each other by the rotary valve 6. Oh dear,
Therefore, the air accommodated in the space 2C of the cylinder 2 between the upper surface of the piston 4 and the cylinder head 5 is compressed completely as the piston 4 rises as shown by arrow A, and the pressure gradually increases.

When the piston 4 further rises, the discharge slit 6e rotates to a position where the discharge hole 5e and the discharge boat 5C communicate with each other, as shown in FIG. The compressed air is sequentially discharged from the discharge port 5c to the air tank.

In this state, the furrowing slit 6d is located at a position where the suction hole 5d and the suction port 5b do not communicate with each other, as shown in FIG. 6, so compressed air does not escape from the suction port 5b.

When the piston 4 further rises and the rotary valve 6 rotates accordingly, and the piston 4 reaches about 20 degrees before the top dead center, the suction slit 6d is connected to the suction hole 5d and suction port 5d, as shown in FIG. 1f to the position where it communicates! ! L, compressed air in the space 2C of the cylinder 2 is discharged from the suction port 5b. In this state, the discharge sulin) 6e is
As shown in the figure, the discharge hole 5e and the discharge port 5c are in a position where they communicate, but when a force is applied to the top dead center of the piston 4, it rotates to a position where the discharge hole 5e and the discharge port 5c do not communicate with each other.

Therefore, for each rotation of the crankshaft 3, the compressed air in the space 2c of the cylinder 2 near the top dead center of the piston 4 is discharged through the suction hole 5d and the suction suction ring) 6d. Therefore, the residual pressure in the space 2C of the cylinder 2 is small, the knocking noise of the driven gear 12 against the drive gear is reduced, and the operating noise of the near compressor 1 can be reduced.

Also, when the air tank is filled with compressed air and the pressure of the compressed air exceeds a certain value, the actuator is activated and the V-joint 32 is rotated to the position where the holes 33 and 34 are communicated, and the compressed air is is discharged through the hole 33, the communication hole 32a and the hole 34 to the suction hole 5b, and is also discharged through the hole 33, the communication hole 32a
Since empty air is sucked in through the suction hole 34 and the air tank 5b, the pressure inside the air tank does not exceed a certain value.

When the pressure inside the air tank drops below a certain value, the control valve 32 is rotated to a position where the holes 33 and 34 are not communicated with each other, so that the air compression action when the piston 4 is raised is not hindered. . The fourth joint 32 may be electrically operated as a magnetic valve.

After the top dead center of the piston 4, as the piston descends as shown by arrow B, the space 2C of the cylinder 2 is no longer in a vacuum state, and air flows into the space 2C of the cylinder 2 as shown in FIG. It flows into the air through the suction port 5b, the suction slit 6d, and the bleaching hole 5d.

As shown in FIG. 11, this joint discharge slit 6e is rotated to the extent that the discharge hole 5e and the discharge port 5C do not communicate with each other. .

The present invention is directed to a rotary valve having a cylinder head formed with a suction slit and a discharge slit which function as a suction valve and a discharge valve, respectively. Since it is equipped with a cane, the compressed air between the top surface of the piston and the cylinder head near the top dead center of the piston is discharged from the suction boat through the suction slit, reducing the knocking noise of the covered part 1 gear against the drive gear. It has the effect of reducing the operating noise of the compressor.It also has the effect of eliminating valve operation noise during suction and discharge, improving durability.Also, the rotary valve's suction slit and discharge Since the position of the slit can be changed freely, there is an effect that the timing of suction and discharge can be freely selected.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical cross-sectional view of the near compressor according to the present invention, Fig. 2 is an oblique view of the rotary valve, and Fig. 3 is the
-■ The vertical cross-sectional views in the direction of the arrows, Figures 4 to 11 show the outline of the operation of the rotary valve, and Figures f4r, W6, and 8
Figures 1 and 10 are feeding cross-sectional views showing the mutual relationship of the rotary pulp, suction hole, and suction port at the beginning of the piston upstroke, during the piston upstroke, about 20° before the piston top dead center, and at the piston downstroke, respectively, and Figure W5 , Figures 7V1v9 and 111 are at the beginning of the piston's upward movement, piston 1.
FIG. 2 is a vertical cross-sectional view showing the relationship between the rotary pulp, the discharge hole, and the discharge port during the second stroke, at about 20° on the piston, and during the downward stroke of the piston. 1 is the near compressor, 2 is the cylinder, 3 is the crankshaft, 4 is the piston, 5 is to the cylinder), 5a, 5
b, 5c, 5d, and 5e are the hollow part of the skeleton cylinder head, f-man boat, discharge port, idle hole, and discharge hole, 6 is the rotary valve, and 6d and 6e are the suction slit and discharge slit of the rotary valve, respectively. be. Sato Snoring Hino Motors Co., Ltd. Agent P Appearance: 1) Kazuo Figure 1 Figure 8 Figure 10 Figure 9 Figure 11 - Dark blue

Claims (1)

[Claims] A cylinder in which a cylindrical hollow part is formed, a crankshaft rotatably supported by the cylinder, a piston connected to the crankshaft and fitted into the hollow part of the cylinder, and a piston of the cylinder. In the near compressor, the cylinder head is provided with a cylinder head mounted on an upper surface and having a suction hole and a discharge hole, respectively, which communicate with the hollow part of the cylinder, and a suction boat and a discharge boat, which are open to the outside, respectively. r) A cylindrical hollow part is formed in the y-da head that communicates with the suction hole and the discharge hole, as well as the suction boat and the discharge boat, respectively, and the hollow part is used for suction so that the suction hole and the suction boat can communicate with each other. inserting a rotary valve having a slit and a discharge slit that allows communication between the discharge hole and the discharge boat;
The rotary valve 1 rotates in conjunction with the crankshaft, and when the piston rises, the compressed air between the upper surface of the piston and the cylinder head is transferred to the discharge hole of the cylinder head and the discharge slit of the front 1i' rotary valve. The compressed air near the top dead center of the piston is discharged to the air tank via the discharge boat, and the compressed air near the top dead center of the piston is discharged to the outside via the suction hole of the cylinder head, the suction slit of the rotary pulp, and the suction boat. A near compressor configured to discharge to.