JP2554732Y2 - Air compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air compressor and, more particularly, to an air compressor which is effective for use in an air brake device of a vehicle such as an automobile.

[0002]

2. Description of the Related Art As an air compressor used in an air brake device for a vehicle such as an automobile, a cylinder chamber, a piston reciprocally slidably fitted in the cylinder chamber, and a piston reciprocated by a driving device communicate with the cylinder chamber. And a discharge valve that opens and closes a discharge path communicating with the cylinder chamber, wherein the suction valve has a disk-shaped valve element (disk valve) orthogonal to a valve seat. Some are configured to open and close a valve port by taking off and sitting in a direction.

In this air compressor,
An unloader is installed above the valve seat of the suction valve.When the air tank pressure reaches a certain value, air in the air tank is guided to the unloader via the pressure regulator, and the piston of the unloader moves the valve body of the suction valve. The push valve port is configured to be opened.

In such an air compressor, a cylinder chamber is connected to an intake system of the engine via the suction passage, and air cleaned by an air cleaner is supplied to the air compressor. I have.

[0005]

However, in such an air compressor, the unloading is performed by opening the suction valve, so that the cylinder chamber of the air compressor and the intake system of the engine are always in communication. When lubricating oil accumulates on the upper surface of the piston of the air compressor, there is a possibility that the lubricating oil is sucked into the engine side by the negative intake air pressure of the engine. When the lubricating oil of the air compressor is sucked into the engine, the intake system is contaminated and adversely affects engine combustion due to an increase in particulates of the engine exhaust.

An object of the present invention is to provide an air compressor that can prevent lubricating oil in a cylinder chamber from being discharged from an intake passage thereof to an intake system of an engine or the like.

[0007]

An air compressor according to the present invention has a cylinder chamber formed in a compressor body.
(13) and the cylinder chamber (13)
Suction paths (20a, 20b) connected to the air system and cylinder
The chamber (13) is connected to the reservoir via the air dryer (33).
The discharge passages (17a, 17b) connected to (6) and the cylinder chamber (13) are reciprocally slidably fitted to the engine and
A piston (14) reciprocated by (2), a suction valve (21) for opening and closing suction paths (20a, 20b), and a discharge valve (18) for opening and closing discharge paths (17a, 17b) ;
An unloader (8) for forcibly opening a suction valve (21) by a signal pressure when unloading when the pressure of the discharge passages (17a, 17b) exceeds a set value. Internal suction passage
(20a) is provided with a check valve (35) for closing the valve passage only when the cylinder chamber side pressure is higher than the engine intake system pressure at the time of operation of the unloader (8 ). Is Discbal
The valve seat (4) by the valve spring (41).
It is urged to the opposite side of 2) and is always open, and the engine intake
When the cylinder chamber pressure becomes higher than the system pressure,
Push against valve seat (42) against bushing (41)
The air passage is configured to close a valve passage.
An opening / closing valve (47) for opening the discharge passage (17b) to the atmosphere when the unloader (8) operates is provided in the gear (33).
Vignetting wherein the are.

[0008]

According to the above-mentioned means, since the check valve is mounted on the suction passage of the compressor body in the suction passage connecting the engine intake system and the cylinder chamber, even if the lubricating oil is discharged from the cylinder chamber, Lubricating oil is prevented from being discharged from the intake passage to the engine intake system, and the intake system of the engine is prevented from being contaminated by the lubricating oil from the air compressor.

In addition, when the unloader is operated and the suction valve is opened, the discharge path is opened to the atmosphere by the on-off valve, so that the load in a driving device such as an engine for driving the air compressor is interposed in the suction path. It is possible to avoid a situation in which the number is increased by the check valve.

[0010]

FIG. 1 is a schematic view showing an air brake device using an air compressor according to an embodiment of the present invention.
FIG. 2 is an enlarged partial longitudinal sectional view showing the air compressor.

In the present embodiment, the air compressor according to the present invention is configured to supply compressed air (hereinafter, referred to as air) to the air brake device 1. Although not described in detail, the air brake device 1 includes an engine 2 for driving a vehicle, an air cleaner 3 for supplying clean air to the engine 2, and a brake operating device 5
A reservoir 6 for supplying air to the brake actuating device 5, a check valve 7 interposed between the reservoir 6 and the air compressor 11, and a check valve 7 between the check valve 7 and the air compressor 11. An air dryer 33 provided, an unloader 8 built in the compressor 11, and a pressure regulator 9 for controlling the unloader 8 and the air dryer 33 are provided.

In this embodiment, the air compressor 11
Is constructed in a positive displacement type in which a piston reciprocates, and includes a cylinder body 12 as a part of a compressor body. A cylinder chamber 13 is formed in the cylinder body 12, and a piston 14 is fitted in the cylinder chamber 13 so as to be slidable in a reciprocating manner. The piston 14 is configured to be linearly driven in a reciprocating manner by the engine 2, and thus the engine 2 substantially constitutes a driving device for driving the air compressor 11. A cylinder head 15 as a part of the compressor body is abutted and fixed to one end (hereinafter referred to as an upper end side) of the cylinder chamber 13, and the cylinder head 15 has a discharge port and a suction port. Are opened so as to communicate with each other. An internal discharge path 17a is connected to the discharge port 16, and a discharge valve 18 is interposed between the discharge port 16 and the internal discharge path 17a inside the cylinder head 15 so as to open and close the flow. . An external discharge path 17 b connected to the internal discharge path 17 a of the cylinder head 15 and provided outside the compressor 11 main body is connected to the reservoir 6 via the air dryer 33 and the check valve 7.

On the other hand, an internal suction passage 20a is connected to the suction port 19, and a suction valve 21 is provided between the suction port 19 inside the cylinder head 15 which is a part of the compressor body and the internal suction passage 20a. Are provided to open and close the flow passage. The suction valve 21 is connected to the cylinder head 15
And a valve chamber 23 substantially formed by a hollow portion of the valve cylinder 22 is communicated with the suction port 19. In the valve chamber 23, a disk valve 24 as a valve body of the suction valve 21 is inserted so as to be movable in the cylinder center direction. The disk valve 24 is always pressed by a valve spring 25 against a valve seat 26. It is to be energized.

An end of the internal suction passage 20a of the cylinder head 15, which is a part of the compressor body, is connected to an external suction passage 20b with a check valve 35 interposed therebetween. It is connected to the air cleaner 3 via the intake pipe 10. A supercharger (turbocharger) 34 is located at a position closer to the engine 2 than the connection point of the external intake passage 20 b in the engine intake pipe 10.
Is interposed.

The check valve 35 is located closer to the cylinder chamber 13 than the engine intake pipe 10 when the unloader operates.
The valve passage is configured to close only when the side pressure is high. That is, a valve cylinder 36 of the check valve 35 is screwed into an end connection port of the internal suction passage 20a in the cylinder head 15 which is a part of the compressor main body. Inhalation path 20a
Is communicated to. A shaft portion 38 protrudes from an end surface of the internal suction passage 20a of the valve cylinder 36 on the side of the suction valve 21.
A disk valve 39 as a valve body is slidably inserted in the shaft direction into the shaft portion 38, and a nut 40 as a stopper is screwed on the outside thereof. Disc valve 39
Is constantly urged by a valve spring 41 to the opposite side to the valve seat (end face) 42 and is pressed against the nut 40. When the unloader is operated, the pressure of the engine intake pipe 10 is closer to the cylinder chamber 13 side. When the pressure increases, the disc valve 39 is pressed against the valve seat 42 to close the valve. In other words, the disc valve 39 is always open during normal operation in which the unloader does not operate, and only when the unloader is operating and the pressure in the cylinder chamber 13 becomes higher than the pressure in the engine intake pipe 10. It is designed to close. And valve room 3
The end of a pipe serving as an external suction path 20b connected to the intake system of the engine is screwed into and connected to the side of the internal suction path 20a of the pipe 7 opposite to the suction port 19.

Inside the cylinder head 15, a cylinder device as the unloader 8 is provided above the suction valve 21 and installed. That is, the cylinder 27 of the unloader 8 is screwed inside the cylinder head 15 in a manner concentric with the valve cylinder 22 and is screwed into the cylinder 27. Are slidably fitted within. Piston 28
The upper limit is regulated by a stopper ring 29 fitted to the cylinder 27, and the lower limit is regulated by a stopper portion 30 formed at an intermediate portion of the cylinder 27. Further, the piston 28 is always pressed to the upper limit position by a spring 31 which takes a reaction force to the cylinder 27. The lower end surface of the piston 28 faces the disk valve 24 of the suction valve 21. At the upper end of the cylinder 27, a control port 32 is opened so as to face the piston 28, and the pressure regulator 9 is connected to the control port 32 as shown in FIG.

The air dryer 33 has a structure in which moisture in the air passing through the air dryer 33 is removed by an adsorbent. An air inlet 43 is provided on the air compressor 11 side, and an air outlet 44 is provided on the check valve 7 side. And is connected to the external discharge path 17b. The air dryer 33 further includes a control port 45 connected to the pressure regulator 9 and an exhaust port 46 communicating with the atmosphere. When a predetermined pressure is applied from the pressure regulator 9 to the control port 45, the air dryer 33 The on-off valve 47 provided in the air dryer 33 is opened, and the inside of the air dryer 33 is configured to communicate with the atmosphere through an exhaust port 46.

Next, the operation will be described. Air compressor 1
When the first piston 14 is moved from the top dead center to the bottom dead center in the cylinder chamber 13, the disc valve 24 of the suction valve 21 moves away from the valve seat 26, so that air flows into the inner and outer suction passages 20 a and 20 b → It is sucked into the cylinder chamber 13 through the suction port 19. At this time, the disc valve 39 is open because the check valve 35 allows air to flow from the engine intake pipe 10 side to the intake port 19 side. Then, in the reverse compression stroke, when the suction valve 21 is closed and the internal pressure of the cylinder chamber 13 reaches a predetermined pressure, the discharge valve 18 is opened.
It is supplied to the reservoir 6 via the inside and outside discharge paths 17a and 17b. At this time, by closing the suction valve 21,
Since the pressure is equal before and after the check valve 35 interposed in the internal suction passage 20a, the check valve 35 remains open.

The air in the reservoir 6 is controlled by a brake valve (not shown) to control the operation of the brake operating device 5 when the brake is operated.
To be activated as needed.

When the internal pressure of the reservoir 6 rises and reaches a set value, this is detected by the pressure regulator 9, and the air in the reservoir 6 is supplied to the unloader 8 and the air dryer 33. As a result, the piston 28 of the unloader 8 is pushed down and the suction valve 21 is opened, so that the cylinder chamber 13 remains in the unloaded state communicating with the inner and outer suction passages 20a and 20b. Further, since the on-off valve 47 is also opened by the signal pressure from the pressure regulator 9 in the air dryer 33, the inner and outer discharge paths 17a, 1
7b is also in an unloaded state communicating with the atmosphere via the air dryer 33. As a result, the load on the engine 2 for driving the air compressor 11 is reduced.

In this unloaded state, even if lubricating oil adheres to the upper surface of the piston 14 due to the rise of oil in the air compressor and this lubricating oil is discharged into the internal suction passage 20a, the lubricating oil remains in the intake negative pressure of the engine. As a result, the check valve 35 prevents the gas from flowing into the engine 2. Therefore, it is possible to prevent the inside of the engine intake pipe 10 from being contaminated by the lubricating oil from the air compressor 11 and from adversely affecting the combustion state of the engine.

By the way, at the time of unloading, the internal suction passage 20
When the check valve 35 is closed by the check valve 35, the pressure in the cylinder chamber 13 increases. Therefore, even if the suction valve 21 is continuously opened by the unloader 8, the check valve 35 closes the internal suction passage 20a. The load effect is diminished.

However, in the present embodiment, not only the suction valve 21 is opened by the unloader 8 at the time of unloading, but also the opening and closing valve 47 of the air dryer 33 is opened to the atmosphere by the signal pressure of the pressure regulator 9. Since the external discharge passage 17b is in communication with the atmosphere, the unloading effect is not impaired by the air communication in the external discharge passage 17b even if the internal suction passage 20a is closed by the check valve 35. That is, even if the pressure in the cylinder chamber 13 increases due to the blockage of the check valve 35, the air in the cylinder chamber 13 causing the pressure increase increases as the discharge valve 18 opens so that the internal discharge passage 17 a and the discharge passage 17 b are opened. Since the air is released from the air dryer 33 to the atmosphere, an increase in pressure in the cylinder chamber 13 is suppressed, and as a result, the load on the engine is reduced.

During a normal compression operation, an operation sound is generated in accordance with the opening and closing of the suction valve 21, and even if air vibration due to the operation sound propagates in the internal suction passage 20 a, the propagation of this vibration is performed by the check valve 35. Since the sound pressure is blocked, the sound pressure level of the valve operation sound can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

For example, in the above embodiment, the end connection port of the internal suction passage 20a in the cylinder head 15, which is the compressor body, is opened in a direction perpendicular to the axis of the cylinder chamber 13, and a check valve 35 is provided at the connection port. The cylinder core is mounted so as to be arranged at right angles to the axis of the cylinder chamber 13, but as shown in FIG.
The end connection port of Oa may be opened in the axial direction of the cylinder chamber 13, and the check valve 35 may be attached to the connection port so that the cylinder core is parallel to the axis of the cylinder chamber 13.

[0027]

[0028]

[Effects of the Invention] As described above, according to the present invention,
Check valve (35) installed in internal suction passage (20a)
Because it is, it is possible to lubricating oil from the air compressor is prevented from flowing into the engine (2), it is possible to suppress the sound pressure level of the valve operating sound of the air compressor. Further, since the open / close valve (47) for opening the discharge path to the atmosphere when the unloader (8) is operated is provided, the check valve (3 ) is provided at the time of unloading.
5) it is possible to release the air suction passage (20a) is a cylinder chamber be closed (13) by ene
The effect of reducing the load of the gin (2) can be prevented from being diminished. Furthermore, the on-off valve (47) is air
Because it is provided in the dryer (33), when unloading
All the lubricating oil discharged to the external discharge passage (17b)
Can be released to the atmosphere.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an air brake device using an air compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged partial longitudinal sectional view showing an air compressor.

FIG. 3 is an enlarged partial longitudinal sectional view of an air compressor showing another embodiment of the present invention.

[Explanation of symbols]

2 ... Engine (drive unit), 3 ... Air cleaner, 5 ... Brake actuator, 6 ... Reservoir, 7 ... Check valve,
8 ... Unloader, 9 ... Pressure regulator, 11 ...
Air compressor, 12: cylinder body, 13: cylinder chamber, 14: piston, 15: cylinder head, 16 ...
Discharge ports, 17a, 17b: discharge path, 18: discharge valve, 19
... Suction ports, 20a, 20b ... Suction paths, 21 ... Suction valves, 2
2 ... valve cylinder, 23 ... valve chamber, 24 ... disk valve (valve element), 25 ... valve spring, 26 ... valve seat, 27 ... cylinder, 28 ... piston, 29 ... stopper ring, 30
... Stopper part, 31 ... Spring, 32 ... Control port,
33 ... air dryer, 34 ... supercharger, 35 ... check valve, 36 ... valve cylinder, 37 ... valve chamber, 38 ... shaft part, 39 ... disk valve, 40 ... nut, 41 ... valve spring, 42 ... valve seat, 43 ... inlet, 44 ... outlet, 45 ... control port, 46 ... exhaust port, 47 ... open / close valve.

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylinder formed on a compressor body.
The chamber (13) and the cylinder chamber (13) are connected to the engine (2).
A suction passage (20a, 20b) connected to the suction system;
Air chamber (13) through an air dryer (33)
The discharge passages (17a, 17b) connected to (6) and the cylinder chamber (13) are reciprocally slidably fitted to the engine and
A piston (14) reciprocated by (2), a suction valve (21) for opening and closing suction paths (20a, 20b), and a discharge valve (18) for opening and closing discharge paths (17a, 17b) ;
An unloader (8) for forcibly opening a suction valve (21) by a signal pressure at the time of unloading when the pressure of the discharge paths (17a, 17b) exceeds a set value; In the internal suction passage (20a)
Is check valve to close the valve passage (35) is mounted only when the cylinder chamber side pressure is higher than the intake system pressure during operation of the unloader (8), this
Check valve (35) has disc valve (39)
Opposite side of valve seat (42) by valve spring (41)
, Which is always open and lower than the engine intake system pressure.
When the cylinder chamber pressure increases, the valve spring
Closes the valve passage by pressing against the valve seat (42) against (41)
The air dryer (33 ) is provided with an on-off valve (47) for opening the discharge passage (17b) to the atmosphere when the unloader (8) is operated. compressor.