JPH09178014A - Pressure regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the construction while insuring sufficient waterproof and dustproof performance. SOLUTION: A cover 34 integrated with cap is crowned on the top part of a body 11 of a pressure regulator so as to cover an exhaust port 33. The cover 34 integrated with cap is integratedly formed out of rubber or resin, and a cap part 35 and a cover part 39 are connected together with the side wall part 37 of the cap part 35. A drain hose 42 is integratedly formed on the cover part 39. Hereby, because the cover integrated with cap doubly seals the exhaust port with the cover part and the cap part, the waterproof and dustproof effect is high. The number of parts, the working manhour, and the assembling manhour of the cover integrated with cap can be decreased because of the monolithic construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator, and more particularly to improvement of its waterproof and dustproof structure,
For example, the present invention relates to a device effectively used as a pressure regulator for a compressed air supply system in an air brake device or the like mounted on a large automobile.

[0002]

2. Description of the Related Art In vehicles such as large automobiles, air is compressed by a compressor driven by an engine, compressed air (hereinafter referred to as air) is stored in a reservoir tank, and the air in the reservoir tank is braked. An air-brake device is used that operates the brake by sending pressure to the device. In such an air brake device, when the air pressure in the reservoir tank exceeds the set pressure,
From the danger that the air brake device will be damaged,
An unloading device for automatically stopping the supply of air to the reservoir tank when the air pressure in the reservoir tank exceeds a certain pressure is incorporated in the air compressor. And to automatically operate this unloading device,
A pressure regulator is provided in an air passage connecting the reservoir tank and the unloading device. That is,
The unloading device is automatically operated by the pressure regulator when the air pressure in the reservoir tank exceeds the set pressure.

Generally, the pressure regulator used in such an air brake device is constructed so as to open and close the air valve passage by the pressure of air, so that water, dust or the like is internally generated from the exhaust port of the pressure regulator. If it enters, smooth pressure adjustment operation cannot be performed. Therefore, in the conventional pressure regulator, the exhaust port is arranged on the top side of the body and
By installing a cover with a drain hose around the exhaust port, air from the exhaust port is discharged to the side surface side of the body through the drain hose of the cover,
It is configured to prevent water and dust from entering the exhaust port.

However, in a pressure regulator mounted on a vehicle, since the installation location of the pressure regulator is the lower part of the vehicle body, it is likely to be exposed to muddy water and the like. Can invade.

Therefore, in a pressure regulator mounted on a vehicle, a cap is attached to the body so as to close the exhaust port, and a cover is attached to the top of the body so as to cover the cap. It has been proposed (see Japanese Utility Model Publication No. 4-23565).
According to this pressure regulator, since the cap is mounted inside the cover of the body, even if muddy water or the like enters the cover, the cap prevents muddy water or the like from entering the exhaust port. That is, since the cap and the cover are doubly sealed, invasion of water and dust is surely prevented.

[0006]

However, in the pressure regulator which is doubly sealed by the cap and the cover, since the cap and the cover are formed separately, the structure becomes complicated and the number of parts is increased. There is a problem that the man-hours for processing, the man-hours for assembly and the man-hours for assembly increase.

An object of the present invention is to provide a pressure regulator capable of simplifying the structure while ensuring a sufficient waterproof and dustproof property.

[0008]

A pressure regulator according to the present invention is characterized in that a cap is integrally formed with a cover by using rubber or resin, and the cap-integrated cover is attached to a body. To do.

According to the above-mentioned means, since the exhaust port of the body is covered by the cap-integrated cover, the waterproof and dustproof effect is high. On the other hand, since the cover part and the cap part are integrally formed, the number of parts, the number of processing steps, and the number of assembly steps are reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a pressure regulator which is an embodiment of the present invention.
(B) is sectional drawing which follows the bb line | wire of (a). FIG. 2 is a plan sectional view taken along the line II-II of FIG. FIG. 3 is a characteristic diagram showing the relationship between the tank side air pressure and the unloader side air pressure.

In the present embodiment, the pressure regulator 10 according to the present invention is constructed so as to be provided in an air passage connecting an unload device of an air supply system (not shown) in an air brake device and a reservoir tank. There is. A primary side port 12 connected to the reservoir tank is opened at the bottom of the body 11 forming the air passage, and a secondary side port 13 connected to the unloading device is opened on the side surface of the body 11. There is. A cylinder chamber 14 is opened inside the body 11, and the cylinder chamber 1
A piston 15 is slidably mounted in the unit 4. The space above the piston 15 in the cylinder chamber 14 substantially forms the atmosphere chamber 18 by opening the top portion thereof at a large size, and the upper end opening thereof substantially forms the exhaust port 33. A communication passage 16 that connects the primary side port 12 and the secondary side port 13 is formed in the piston 15, and a valve chamber 17 is formed in a cylindrical hole shape. Further, the piston 15 is provided with an exhaust passage 19 which branches from the communication passage 16 and communicates with the atmosphere chamber 18.

A valve seat 20 is formed on the ceiling surface of the valve chamber 17 around the lower end opening of the exhaust passage 19, and a valve body 21 is installed inside the valve chamber 17. The valve body 21 is integrally formed in a cylindrical shape by using an elastic body of rubber or resin, and is installed almost throughout the valve chamber 17. Valve 2
Convex portions 21a having a semicircular cross-section are provided on both end faces of 1 in a concentric ring shape. Four relief grooves 22 are formed in the side wall surface of the valve chamber 17 at the lower end of the piston 15 and are arranged at equal intervals in the circumferential direction so as to communicate with the primary side port 12.

In the atmosphere chamber 18, an adjusting rod 23, an adjusting nut 24, a return spring 25, a spring receiver 2 are provided.
9 and valve stem 27 are installed. The adjusting rod 23 is arranged on the axis of the body 11, and
An adjustment nut 24 is fastened to a spring receiver 29 fixed to the upper end of the shaft by a stopper 28 so as to be adjustable in the axial direction. The tip of the adjusting rod 23 is butted against the top of the valve rod 27 that is coaxially arranged. The return spring 25 is interposed between the piston top portion 26 and the spring receiver 29 in a stored state, and the piston top portion 26 exerts a reaction force on the body 11 to repulsive force of the return spring 25. Always biased in the direction. A small hole 29a is formed in the spring receiver 29.

The valve rod 27 is fitted in the exhaust passage 19 slidably in the axial direction, and the spring 3 is interposed between the head portion 30 of the valve rod 27 and the spring receiving engaging portion 15a.
The valve rod 27 is abutted against the adjusting rod 23 by being urged to the spring receiving 29 side (upward) by 1. The upper end of the spring 31 is engaged with the head portion 30 of the valve rod 27, and the lower end of the spring 31 is engaged with the spring receiving engagement portion 15 a around the valve rod 27 of the piston 15. An exhaust passage 32 is opened in the center of the valve rod 27 so as to cooperate with the exhaust passage 19. This exhaust passage 3
2 communicates with the atmosphere chamber 18 near the head 30 of the valve rod 27, and the lower end opening faces the valve body 21.

A cap-integrated cover 34 is attached to the upper end of the body 11 so as to close the exhaust port 33, which is the upper end opening of the body.
Is integrally formed using rubber or a resin having flexibility. The cap portion 35 of the cap-integrated cover 34 is formed in a substantially hat shape.
The lower surface of the collar portion 36 is in close contact with the upper surface of the body 11.

The cover portion 39 of the cap-integrated cover 34
Is integrally formed in a hat shape larger than the cap portion 35, and the central portion of the cover portion 39 is formed so as to share the top portion of the cap portion 35. That is, the cap portion 35 and the cover portion 39 are integrally connected by the side wall portion 37 of the cap portion 35 which is concentrically bulged in a short cylindrical shape between the opposing surfaces thereof. That is, since the cap portion 35 and the cover portion 39 are subjected to the flow-flow molding by the side wall portion 37, the cap-integrated cover 34 can be integrally molded. A convex portion 40 is formed so as to bulge upward in the central portion of the cover portion 39, and a void 41 is formed. A drain hose 42 is formed in an elbow shape on a part of the outer periphery of the cover portion 39 and is provided so as to project outward in the radial direction. The discharge port 43 of the drain hose 42 faces the outer peripheral surface of the lower end portion of the body 11. It is open.

Next, the operation will be described. When the pressure of the air in the reservoir tank is atmospheric pressure, the valve body 21 and the valve rod 27 of the pressure regulator 10 are in the state shown in FIG. In this state, the primary port 1
2 and the secondary side port 13 are closed by a valve body 21 in a communication passage 16 of a valve chamber 17. At this time, the secondary port 13 has the atmosphere chamber 18, the communication passage 16, and the exhaust passage 1
It is in communication with the exhaust port 33 through 9, 32 and is open to the atmosphere.

Next, when the pressure in the reservoir tank increases and the air pressure in the reservoir tank reaches the low-pressure side operating pressure P ₁ as shown in FIG. 3, the pressure in the primary side port 12 increases, so that The air pressure in the reservoir tank moves the piston 15 slightly upward. However, valve chamber 1
The communication passage 16 side of 7 remains closed by the valve body 21.

Next, when the pressure in the reservoir tank rises as shown in FIG. 3, the pressure in the primary side port 12 also rises, so that the valve rod 27 is slightly moved upward so that the valve rod 27 moves to the exhaust passage. The valve rod 27 and the valve body 21 come close to each other while descending relatively in the inside 19. At this time, the communication passage 16 of the valve chamber 17 remains closed by the valve body 21. That is, in the valve body 21, when the piston 15 moves further upward due to the pressure increase in the primary side port 12 due to the pressure increase in the reservoir tank, the valve rod 2 in the valve chamber 17
The valve seat 20 of the piston 15 and the valve body 21 are separated from each other while being seated on the valve 7.

Further, when the pressure in the reservoir tank rises, the piston 15 is moved further upward by the pressure in the cylinder chamber 14, and the valve body 21 is restrained from moving by the valve rod 27. Air passes away from the seat 20. Therefore, the air pressure on the side of the unloading device rapidly increases as shown in FIG. That is, the pressure of the primary side port 12 is the relief groove 22, the valve chamber 1
7, the communication passage 16 and the secondary port 13 are applied to the unloading device.

When the pressure in the air reservoir decreases due to the use of the brake actuator or the like, the air pressure on the unloading device side also decreases to the value shown in FIG. When the pressure of the secondary side port 13 decreases with this pressure decrease,
Since the piston 15 moves downward and reaches a position slightly moved upward from the state of FIG. 1, the valve body 21 and the valve rod 2
7, the communication passage 16 and the exhaust passage 32 are opened.

As described above, according to this embodiment,
When the air pressure in the reservoir tank exceeds the set pressure,
The unloading device is activated to prevent the air pressure in the reservoir tank from exceeding the set pressure.

In the present embodiment, since the exhaust port 33 is covered with the cap portion 35 in the cover portion 39, water, dust or the like will enter from the discharge port 43 and reach the inside of the cover portion 39. However, these movements are blocked by the seal between the flange portion 36 of the cap portion 35 and the upper end surface of the body 11, and water and dust are prevented from entering the inside of the cap portion 35. .
Therefore, the operating portion of the pressure regulator 10 is completely protected from water, dust, etc., and reliable operation can be maintained.

Further, according to this embodiment, since the cap portion 35 is formed integrally with the cover portion 39, not only the number of parts can be reduced but also the man-hours for assembling and the man-hours for assembling are reduced. be able to.

[0025]

As described above, according to the present invention,
Since the cap portion and the cover portion are integrally formed, it is possible to reduce the number of parts, the number of processing steps, and the number of assembly steps while ensuring sufficient waterproof and dustproof performance.

[Brief description of the drawings]

FIG. 1 shows a pressure regulator according to an embodiment of the present invention, in which (a) is a front sectional view and (b) is (b) in (a).
It is sectional drawing which follows the -b line.

FIG. 2 is a plan sectional view taken along the line II-II of FIG.

FIG. 3 is a characteristic diagram showing a relationship between a tank side air pressure and an unloading device side air pressure.

[Explanation of symbols]

10 ... pressure regulator, 11 ... body, 12 ...
Primary side port, 13 ... Secondary side port, 14 ... Cylinder chamber, 15 ... Piston, 15a ... Spring receiving engagement part,
16 ... Communication passage, 17 ... Valve chamber, 18 ... Atmosphere chamber, 19 ... Exhaust passage, 20 ... Valve seat, 21 ... Valve body, 21a ... Convex part, 22
… Escape groove, 23… Adjustment rod, 24… Adjustment nut, 25
... Return spring, 26 ... Piston top part, 27 ... Valve rod, 28 ... Stopper, 29 ... Spring receiver, 30 ... Head part, 31 ... Spring, 32 ... Exhaust passage, 33 ... Exhaust port, 34 ... Cap integrated cover, 35 ... Cap portion, 36 ... Collar portion, 37 ... Side wall portion, 39 ... Cover portion, 40
... convex part, 41 ... void, 42 ... drain hose, 43 ... discharge port.

Claims (1)

[Claims] A primary port, a secondary port,
An exhaust port and a cylinder chamber that communicates with each port are respectively opened, and a piston is slidably inserted into the cylinder chamber, and the piston has a valve chamber that communicates with the primary port and a valve chamber that communicates with the primary port. A communication passage connecting the secondary side port and an exhaust passage connecting the valve chamber and the exhaust port are respectively provided, and the communication passage and the exhaust passage are formed in the valve chamber according to the pressure of the primary side port. A pressure regulator in which a valve body for opening and closing is installed, a cap is attached to the body so as to close the exhaust port, and a cover for covering the cap is attached outside the cap of the body, wherein the cap is The cover is integrally molded using rubber or resin. It is fitted on the outer circumference of
A pressure regulator in which one end surface of the cap portion is in close contact with one end surface of the body.