JPH0521186U - Air conditioner presser - Google Patents

Abstract

(57) [Summary] [Purpose] The unloader is integrated into the air compressor while avoiding deterioration of sealing performance and disassembly and assembly workability. An unloader cylinder chamber 31 is formed in a cylinder head 15 as a part of an air compressor body, and an unloader piston 32 is fitted into the cylinder chamber 31 so as to face an intake valve body 24 of the air compressor. The seal ring 40 is fitted on the sliding surface of the piston 32 with the unloader cylinder chamber 31, and the suction valve body 2 of the unloader piston 32 is further attached.
The held convex portion 41 is formed on the end surface on the opposite side to 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to an air compressor, and more particularly to an improvement in an intake system thereof, and, for example, to an air compressor effective for use in an air brake device of a vehicle such as an automobile.

[0002]

[Prior Art]

 As an air compressor used in the air brake system of vehicles such as automobiles, it has a piston that is reciprocally slidably fitted in a cylinder chamber and a cylinder chamber and is reciprocated by a drive unit, and an intake passage that communicates with the cylinder chamber. It is equipped with an intake valve that opens and closes, and a discharge valve that opens and closes the discharge passage that communicates with the cylinder chamber. The intake valve is a disc-shaped valve body (disc valve) that is seated in a direction orthogonal to the valve seat. Therefore, there is one configured to open and close the valve opening.

Further, in this air compressor, an unloader is provided above the valve seat of the intake valve, and when the air tank pressure reaches a constant value, the air in the air tank passes through the unloader via a pressure regulator. The piston of the unloader is guided to push the valve body of the intake valve and open the valve opening. The unloader is assembled separately from the main body of the air compressor, and the assembly is assembled above the valve seat of the intake valve in the main body of the air conditioner press.

[0004]

[Problems to be solved by the device]

 However, in an air compressor in which the unloader is separately unitized or modularized, there is a problem that the number of parts and the number of assembly steps increase, which causes a cost increase.

Therefore, it is generally considered that the unloader is integrated into the main body of the air compressor. However, in the structure where the unloader is simply integrated, the following problems may occur. Was revealed.

[0006] The sealing performance between the unloader piston for pushing the valve body of the intake valve to open the valve port and the air compressor body is deteriorated.

It becomes difficult to attach / detach the unloader piston during disassembly and assembly work such as maintenance.

An object of the present invention is to provide an air compressor in which an unloader can be integrated into a compressor body while avoiding deterioration of sealing performance and disassembly and assembly workability.

[0009]

[Means for Solving the Problems]

 An air compressor according to the present invention includes a compressor main body, a cylinder chamber formed inside the compressor main body, which introduces air through an intake passage connected to an intake system of an engine, and a cylinder chamber slidably fitted in the cylinder chamber. And the piston reciprocated by the drive unit, the suction valve that opens and closes the suction passage, the discharge valve that opens and closes the discharge passage communicating with the cylinder chamber, and the pressure in the discharge passage output system exceeds the set value. In an air compressor having an unloading piston for forcibly opening the intake valve by signal pressure during unloading, an unloader cylinder chamber is formed in the compressor body adjacent to the intake valve. The unloader piston is slidably inserted into the cylinder chamber through a spring, and the unloader piston is inserted into the opening of the cylinder chamber. The lug is inserted so as to regulate the position of the unloading piston, and a seal ring is fitted on the sliding contact surface of the unloading piston with the unloading cylinder chamber. A holding portion is formed on the plug-side end surface of the working piston.

[0010]

According to the above-mentioned means, after the unloader piston is fitted in the unloader cylinder chamber opened in the compressor body, the cylinder chamber is closed by the plug, so that the unloader piston is integrated with the compressor body. Can be incorporated into. Further, when the piston is pulled out from the unloader cylinder chamber, the held portion of the unloader piston can be held with fingers or a tool, so the unloader piston can be pulled out easily from the unloader cylinder chamber. You can

[0011]

【Example】

 FIG. 1 is an enlarged partial vertical sectional view showing an air compressor according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an air brake device in which an air compressor is used.

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 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 an air cleaner for the brake operating device 5. 6, a check valve 7 provided between the reservoir 6 and the compressor 11, an unloader 8 built in the air compressor 11, and a pressure for controlling the unloader 8. A regulator 9 is provided.

In the present embodiment, the air compressor 11 is of a positive displacement type in which a piston reciprocates, and includes a cylinder body 12 as a part of the compressor body. A cylinder chamber 13 is formed in the cylinder 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 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. Openings are formed so as to communicate with the chambers 13, respectively. A discharge passage 17 is connected to the discharge port 16, and a discharge valve 18 is provided between the discharge port 16 and the discharge passage 17 inside the cylinder head 15 so as to open and close the flow. The discharge passage 17 is connected to the reservoir 6 via the check valve 7. On the other hand, an intake passage 20 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 disposed between the suction port 19 and the suction passage 20 inside the cylinder head 15 as a part of the compressor body, and is provided so as to open and close the flow passage. There is. The intake valve 21 includes a valve cylinder 22 that is screwed into the cylinder head 15, and a valve chamber 23 that is substantially formed by the hollow portion of the valve cylinder 22 communicates with the intake port 19. A disc valve 24 as a valve body of the intake valve 21 is inserted in the valve chamber 23 so as to be movable in the cylinder center direction, and the disc valve 24 is pressed by a valve spring 25 against a valve seat 26. It is always being biased.

Inside the cylinder head 15 which is a part of the compressor body, a cylinder device as an unloader 8 is arranged above the intake valve 21 and integrally incorporated therein. That is, a cylinder chamber 31 of the unloader 8 is formed above the valve cylinder 22 and concentrically inside the cylinder head 15 which is a part of the compressor body. Is fitted so that the unloading piston 32 can slide within a predetermined stroke range. The upper limit of the piston 32 is regulated by the plug 33 screwed to the unloader cylinder 31, and the lower limit thereof is regulated by the stopper portion 34 formed in the middle portion of the cylinder chamber 31. Further, the unloader piston 32 is constantly pressed to the upper limit position by a spring 35 having a reaction force against the bottom wall of the unloader cylinder chamber 31. The lower end surface of the unloader piston 32 is opposed to the disc valve 24 of the suction valve 21. A control port 36 is formed at the upper end of the plug 33 screwed into the unloader cylinder chamber 31 so as to communicate with the cylinder chamber 31 and face the piston 32, as shown in FIG. As described above, the pressure regulator 9 is connected to the control port 36.

Further, in this embodiment, the unloader piston 32 is formed in a substantially two-step cylindrical shape having a small diameter portion 37 and a large diameter portion 38, and the large diameter portion 37 slides on the unloader cylinder chamber 31. It is movably fitted and the tip of the small diameter portion 37 side faces the disc valve 24. An annular groove 39 is cut on the outer periphery of the large diameter portion 38 of the unloader piston 32 to have a constant width and a constant depth, and a seal ring 40 is fitted in the annular groove 39. Further, a convex portion 41 as a held portion is projected from the end surface of the large diameter portion 38 of the unloader piston 32, and the convex portion 41 allows the piston 32 to be attached to and detached from the unloader cylinder chamber 31. It is formed so that it can be easily held by fingers, tools, etc.

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 disk valve 24 of the intake valve 21 is separated from the valve seat 26, so that the air flows from the intake passage 20 to the intake port 19. After that, it is sucked into the cylinder chamber 13. Then, in the reverse compression stroke, when the intake valve 21 is closed and the internal pressure of the cylinder chamber 13 reaches a predetermined pressure, the discharge valve 18 is opened, so that high-pressure air is discharged from the discharge port 16 to the discharge passage 17. And is supplied to the reservoir 6 via.

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 cylinder chamber 31 of the unloader 8. The piston 32 of the unloader 8 is pushed down by this air and the intake valve 21 is opened, so that the cylinder chamber 13 remains in communication with the intake passage 20 and is in an 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.

Meanwhile, during operation of the air compressor, the air sucked into the suction passage 20 tends to leak to the outside from between the sliding contact surface between the piston 32 and the cylinder chamber 31 in the unloader 8. However, in this embodiment, since the seal ring 40 is fitted to the unloader piston 32, the sliding surface between the piston 32 and the cylinder chamber 31 is completely sealed, so that the suction passage 20 is provided. The sucked air does not leak outside. Therefore, the reduction of the compression efficiency of the air compressor due to the leakage is prevented in advance.

The assembling work of the unloader 8 to the cylinder head 15 as the compressor body is performed by inserting the unloader piston 32 together with the spring 35 into the unloader cylinder chamber 31 from above, and then inserting the plug 33 into the unloader cylinder chamber 32. Just screw it in. This work is very simple, and it is only an operation from top to bottom, so it is extremely easy work.

When the unloader piston 32 is detached from the unloader cylinder chamber 31 during disassembly work such as maintenance work, after the plug 33 is removed from the unloader cylinder chamber 31, a finger, a tool, etc. By the convex portion 41 being gripped and lifted by the unloader piston 32, the unloader piston 32 is extracted from the unloader cylinder chamber 31.

Here, when the convex portion 41 is not provided on the piston 32, the seal ring 40 is fitted to the unloader piston 32, so that the unloader piston 32 is moved from the unloader cylinder chamber 31. Extraction work becomes extremely difficult. For example, it is necessary to remove the cylinder head 15 from the cylinder body 12 and then push out the unloader piston 32 from the suction port 19 side. In other words, by forming the held portion 41 on the end surface of the unloader piston 32 on the port 36 side, the seal ring 40 can be fitted to the unloader piston 32 for the first time.

Further, during the assembling / disassembling work, since the operator can hold the convex portion 41 and handle the unloader piston 32, it is possible to prevent the seal ring 40 from being damaged, and at the same time, the fingers And tools can be protected from dirt.

As described above, according to this embodiment, the unloader 8 can be integrally incorporated in the cylinder head 15 which is a part of the main body of the air compressor, so that the unloader 8 can be made into a unit or a module. The number of parts and the number of processing and assembling steps can be reduced as compared with the case of assembling and assembling into the cylinder head 15. As a result, cost reduction can be realized.

It is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the held portion provided on the unloader piston is not limited to the convex portion, but may be formed in an appropriate shape such as a concave portion that can be held by a holding tool such as a finger or pliers.

[0027]

[Effect of the device]

 As described above, according to the present invention, it is possible to integrally incorporate the unloader into the compressor body while avoiding deterioration of sealing performance and disassembly and assembly workability.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing an air brake device in which an air compressor is used.

[Explanation of symbols]

2 ... Engine (driving device), 3 ... Air cleaner, 5 ... Brake actuating device, 6 ... Reservoir, 7 ... Check valve, 8 ...
Unloader, 9 ... Pressure regulator, 11 ... Air compressor, 12 ... Cylinder body (compressor body), 13 ... Cylinder chamber, 14 ... Piston, 15 ... Cylinder head (compressor body), 16 ... Discharge port, 17
... discharge path, 18 ... discharge valve, 19 ... suction port, 20 ... suction path, 21 ... suction valve, 22 ... valve cylinder, 23 ... valve chamber, 24 ... disk valve (valve element), 25 ... valve spring, 26
... Valve seat, 31 ... Unloader cylinder chamber, 32 ... Unloader piston, 33 ... Stopper ring, 34 ... Stopper part, 35 ... Spring, 36 ... Control port, 37 ... Small diameter part, 38 ... Large diameter part, 39 ... Annular Groove, 40 ... Seal ring, 41 ... Convex portion (held portion).

Claims (1)

[Scope of utility model registration request] 1. A compressor main body, a cylinder chamber formed inside the compressor main body, for introducing air through an intake passage connected to an intake system of an engine, and reciprocally slidably fitted in the cylinder chamber, A piston that is reciprocated by a drive device, an intake valve that opens and closes the intake passage, a discharge valve that opens and closes a discharge passage that communicates with a cylinder chamber, and an unload when the pressure of the discharge passage output system exceeds a set value. In an air compressor including an unloading piston for forcibly opening the intake valve by a signal pressure, an unloader cylinder chamber is formed in the compressor body adjacent to the intake valve, and the unloader cylinder chamber is formed in the cylinder chamber. The unloader piston is slidably inserted through a spring, and the plug for unloading is installed in the opening of this cylinder chamber. A sealing ring is fitted to a sliding contact surface of the unloading piston with the unloading cylinder chamber, and the plug of the unloading piston is inserted. An air compressor in which a held portion is formed on a side end surface.