JPH0552279U - Air compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the reed valve from violently vibrating due to the pressure caused by the vertical movement of the piston, by fixing both ends of the valve body during unloading. [Structure] Cylinder chamber 1 opened in the cylinder body 12
3, a piston 14 inserted in the cylinder chamber 13,
A reed valve of the suction valve 21 in a compressor including a suction valve 21 that opens and closes the suction port 19, a discharge valve 18 that opens and closes the discharge port 16, and a cylinder device 8 that drives the suction valve 21 to open during unloading. 23 has one end fixed to the valve plate 22 by a screw member 24, a convex portion 25 is formed on the free end portion which is the other end, and a concave portion 28 that can be fitted into the convex portion 25 is formed in the cylinder body 12. When the reed valve 23 is pressed at the time of unloading, the convex portion 25 becomes the concave portion 2
8 and the both ends of the reed valve 23 are fixed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an air compressor, and more particularly, to an improvement in an intake system thereof, and more particularly to an air compressor which is effectively used for an air brake device of a vehicle such as an automobile.

[0002]

[Prior Art]

 As an air compressor used in an air brake device for vehicles such as automobiles, a piston that is reciprocally slidably fitted in a cylinder chamber and a cylinder chamber and reciprocated by a drive unit, and an intake port that communicates with the cylinder chamber A suction valve that opens and closes the valve and a discharge valve that opens and closes the discharge port that communicates with the cylinder chamber are provided. There is a structure in which the valve port is opened and closed by being seated in the seating direction.

Further, in this air compressor, an unloading actuator is installed above the valve seat of the intake valve, and when the air tank pressure reaches a set value, the air in the air tank acts as a pressure regulator for the actuator. Guided via the actuator, the piston of the actuator pushes the valve body of the intake valve to open the valve opening.

In such an air compressor, the reed valve as a suction valve is composed of a thin plate of about 0.3 to 0.5 mm, and only one end is fixed and the other end is free. By being configured at the end, the valve opening / closing operation can be repeated at high speed according to the pressure in the cylinder chamber.

[0005]

[Problems to be solved by the device]

 However, in such an air compressor, only one end of the reed valve is fixed and the other end is open, so that when the reed valve is pressed by the drive of the actuator during unloading, the piston The pressure associated with vertical movement causes the reed valve to vibrate violently, resulting in reduced durability of the reed valve.

An object of the present invention is to provide an air compressor capable of fixing both ends of a valve body at the time of unloading and preventing the valve body from vibrating due to pressure caused by vertical movement of a piston.

[0007]

[Means for Solving the Problems]

 The air compressor according to the present invention includes a cylinder chamber formed in a cylinder body, a piston reciprocally slidably fitted in the cylinder chamber, and reciprocatingly moved by a drive unit, and an intake port opened in the cylinder chamber. Intake valve that opens and closes the discharge valve, a discharge valve that opens and closes the discharge port that is opened in the cylinder chamber, and an unloading actuator that drives the intake valve to open when the discharge side pressure exceeds the set value. The suction valve includes a reed-shaped valve body, and the valve body is configured to bend and deform in the axial direction of the suction port, and one end of the valve body is fixed to the cylinder body. In an air compressor whose end is configured as a free end, a projection is formed on the free end of the reed valve body of the suction valve so as to project toward the piston, and It is characterized in that a concave portion capable of fitting with the convex portion is recessed in the facing surface.

[0008]

[Action]

 According to the above-mentioned means, the valve body of the intake valve is normally fixed to the cylinder body at one end and is free at the other end in the normal state, but when unloading, the valve body is pushed toward the piston side by the actuator. Then, the convex portion of the valve body is fitted into the concave portion of the cylinder body, so that both ends of the valve body are fixed. In the state where both ends are fixed, even if the force due to the vertical movement of the piston acts on the valve body, the valve body is prevented from vibrating violently.

[0009]

【Example】

 FIG. 1 is a partial front sectional view showing an air compressor according to an embodiment of the present invention, FIG. 2 is a partial front sectional view showing its operation, and FIG. 3 is a plan sectional view thereof. FIG. 4 is a schematic diagram showing an air brake device in which the air compressor is used.

In this 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. Although detailed description is omitted, 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, a brake operating device 5, and a brake operating device 5. A reservoir 6 for feeding air, a check valve 7 provided between the reservoir 6 and the air compressor 11, an unloading cylinder device 8 incorporated in the compressor 11, and an unloading device. A pressure regulator 9 for controlling the cylinder device 8 is provided.

In this embodiment, the air compressor 11 is of a reciprocating type and has a cylinder body 12. A cylinder chamber 13 is formed in the main body 12, and a piston 14 is reciprocally slidably fitted in the cylinder chamber 13. The piston 14 is configured to be linearly driven by the engine 2 in a reciprocating manner. Therefore, the engine 2 substantially constitutes a drive device for driving the air compressor 11.

A cylinder head 15 is attached to one end (hereinafter, referred to as an upper end side) of the cylinder chamber 13 via a valve plate 22, and a valve plate 22 is provided with a discharge port 16 and a suction port 19. It is opened so as to communicate with each of the chambers 13. A discharge passage 17 opened in the cylinder head 15 is connected to the discharge port 16, and a discharge valve 18 configured by using a reed valve is provided on the valve plate 22 inside the cylinder head 15. It is provided to open and close. The discharge passage 17 is connected to the reservoir 6 via the check valve 7.

On the other hand, an intake passage 20 opened in the cylinder head 15 is connected to the intake port 19, and the intake passage 20 is connected to the air cleaner 3 via the engine intake pipe 10. A suction valve 21 is provided on the end surface of the valve plate 22 on the cylinder chamber 13 side so as to open and close the suction inlet 19. That is, the suction valve 21 is provided so as to share the valve plate 22 sandwiched between the cylinder body 12 and the cylinder head 15 with the discharge valve 18, and the valve plate 22 includes the suction port 19 and the discharge valve 19. Exit 16 is open.

The suction valve 21 is provided with a reed-type valve body (hereinafter, referred to as a reed valve) 23 made of a thin elastic plate material having a thickness of about 0.3 to 0.5 mm. One end of the reed valve 23 is screwed. It is fixed to the valve plate 22 by a member 24, and the other end is configured as a free end.

In this embodiment, the free end portion of the reed valve 23 is formed with a convex portion 25 bulging in a downward arc shape. The convex portion 25 is arranged so as to face a rod insertion opening 26 formed in the valve plate 22 and a V-shaped groove 28 as a concave portion formed in the step portion 27 of the cylinder body 12. It is formed so that it can be fitted.

When the rod 30 formed at the tip of the unloading piston 29 is inserted into the rod insertion opening 26 by the driving of the unloading piston 29 and presses the reed valve 23 during unloading. In addition, the reed valve 23 moves in the step portion 27 so that the convex portion 25 is fitted into the V-shaped groove 28.

The unloading piston 29 is reciprocally housed in the unloading cylinder device 8, and the cylinder device 8 is installed inside the cylinder head 15 as an unloading actuator (driving device).

That is, a cylinder chamber 31 is opened in the upper portion of the cylinder head 15, and the unloading piston 29 can slide in the cylinder chamber 31 in the axial direction within a predetermined stroke range. Is fitted to. The backward limit of the piston 29 is regulated by a plug 32 screwed into a cylinder chamber 31, and the forward limit thereof is regulated by a stopper portion 33 formed in an intermediate portion of the cylinder chamber 31.

The piston 29 is always urged in the backward limit direction by a spring 34 that exerts a reaction force on the cylinder chamber 31. A control port 35 is opened in the plug 32 so as to face the piston 29. The pressure regulator 9 is connected to the control port 35.

Next, the operation will be described. When the piston 14 is moved from the top dead center to the bottom dead center in the cylinder chamber 13, the reed valve 23 of the suction valve 21 bends in the axial direction of the suction port 19 and separates from the valve plate 22 to cause air to flow. Is sucked into the cylinder chamber 13 through the suction passage 20 and the suction port 19.

Then, in the reverse compression stroke, the reed valve 23 is returned to the original state, so that the intake valve 21 is closed. Subsequently, when the internal pressure of the cylinder chamber 13 reaches a predetermined pressure, the discharge valve 18 is opened, so that high-pressure air is supplied to the reservoir 6 via the discharge port 16 → the discharge passage 17.

The air in the reservoir 6 is appropriately supplied to the brake operating device 5 when the brake is operated by the control of a brake valve (not shown) to operate the brake operating device 5.

When the internal pressure of the reservoir 6 rises and reaches the set value, this is detected by the pressure regulator 9 and the air in the reservoir 6 is supplied to the unloading cylinder device 8. As a result, the piston 29 of the unloading cylinder device 8 is moved forward, and the intake valve 21 is opened, as will be described later, so that the cylinder chamber 13 remains in communication with the intake passage 20 and enters the unloading state.

As a result, the supply of air from the air compressor 11 to the reservoir 6 is stopped, and at the same time, the load on the engine 2 for driving the air compressor 11 is reduced.

At the time of this unloading, the reed valve 23 is pressed by the rod 30 by the forward movement of the piston 29, and the suction port 19 is opened. As a result, the suction passage 20 and the cylinder chamber 13 are in the unload state as described above.

When the reed valve 23 is pressed by the rod 30 with the intake valve 21 in the open state, the arc-shaped convex portion 25 is fitted into the V-shaped groove 28 as a concave portion, so that the wedge effect is achieved. The free end of the reed valve 23 is fixed to the step 27.

That is, since both ends of the reed valve 23 are fixed during unloading, even if the piston 14 moves up and down and the pressure in the cylinder chamber 13 changes in this state, the reed valve 23 responds to this pressure. It is possible to prevent the reed valve 23 from being severely deformed or vibrated. As a result, the durability of the reed valve 23 can be improved.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, the case where the convex portion 25 is integrally formed on the reed valve 23 is described. The convex portion is formed by a pin as shown in FIG. You may.

That is, in FIG. 5, a pin insertion hole 36 is formed in the reed valve 23 A so as to face the rod insertion port 26, and a pin that substantially forms a convex portion is formed in the pin insertion hole 36. 37 is fitted.

Also in the second embodiment, since the shaft portion 38 as the convex portion of the pin 37 is fitted in the V-shaped groove 28 as the concave portion, it is possible to obtain the same effect as that of the above-mentioned embodiment.

[0032]

[Effect of the device]

 As described above, according to the present invention, since both ends of the valve body are fixed during unloading, even if the pressure in the cylinder chamber changes due to the vertical movement of the piston during unloading, It is possible to prevent the valve element from vibrating violently in response to this pressure, and as a result, it is possible to improve the durability of the intake valve.

[Brief description of drawings]

FIG. 1 is a partial front sectional view showing an air compressor according to an embodiment of the present invention.

FIG. 2 is a partial front vertical sectional view showing an operation.

FIG. 3 is a plan sectional view thereof.

FIG. 4 is a schematic diagram showing an air brake device in which the air compressor is used.

FIG. 5 is a partial front sectional view showing an air compressor according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Air brake device, 2 ... Engine (drive device), 3
... Air cleaner, 5 ... Brake actuating device, 6 ... Reservoir, 7 ... Check valve, 8 ... Unloading cylinder device (actuator), 9 ... Pressure regulator, 1
1 ... Air compressor, 12 ... Cylinder body, 13 ... Cylinder chamber, 14 ... Piston, 15 ... Cylinder head, 1
6 ... Discharge port, 17 ... Discharge passage, 18 ... Discharge valve, 19 ... Suction port, 20 ... Suction passage, 21 ... Suction valve, 22 ... Valve plate, 23, 23A ... Reed valve, 24 ... Screw member, 2
5 ... Convex part, 26 ... Rod insertion port, 27 ... Step part, 28 ... V
V-shaped groove (recess), 29 ... Piston for unloading, 30
... rod, 31 ... cylinder chamber, 32 ... plug, 33 ... stopper part, 34 ... spring, 35 ... control port, 36
... Pin insertion port, 37 ... Pin, 38 ... Shaft part (convex part).

Claims (1)

[Scope of utility model registration request] 1. A cylinder chamber formed in a cylinder body, a piston reciprocally slidably fitted in the cylinder chamber, and reciprocally moved by a drive device, and a suction opening / closing a suction port opened in the cylinder chamber. A valve, a discharge valve that opens and closes a discharge port opened in the cylinder chamber, and an unloading actuator that drives the intake valve to open when the discharge side pressure exceeds a set value. The suction valve includes a reed-shaped valve body, which is configured to be flexibly deformed in the axial direction of the suction port, one end of which is fixed to the cylinder body and the other end of which is a free end. In the air compressor configured, a convex portion is formed at the free end of the reed-type valve body of the intake valve so as to project toward the piston, and a convex portion is formed on the surface facing the convex portion of the cylinder body. Matable Air compressor parts is characterized in that it is Botsu設.