JPS6015723Y2 - Brake air system pressure alarm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting and warning an abnormal increase in pressure upstream of a near reservoir due to trouble such as air filter clogging in a brake air system of a vehicle.

In a vehicle's brake air system, pressurized air supplied from a compressor is stored in a reservoir tank and then
Controlled pressure is supplied to each part of the vehicle's brakes.

In this case, moisture in the atmosphere becomes droplets due to pressurization by the compressor, adiabatic expansion in the near reservoir, or the like, or the lubricating oil in the compressor exists in the compressed air as it is or in a carbonized state.

If such impurities block the air line between the compressor and the near reservoir or clog the filter of the separator, the near reservoir internal pressure will drop and the brake pressure in each part of the brake will be insufficient, resulting in an extremely dangerous situation.

In addition, on the upstream side of the clogging, the unload signal does not reach the compressor due to the pressure drop in the near reservoir, and the compressor continues to rotate, resulting in abnormally high pressure and damage to piping and equipment.

Therefore, in order to prevent such a situation from occurring, the present invention provides a device that senses pressure abnormality in the brake air system upstream of the near reservoir and issues an alarm.

An embodiment of the present invention will be described below based on the drawings.

Compressed air is sent under pressure from a near compressor 1 driven by an engine (not shown) in FIG. 1, and is stored in a near reservoir 4 via a separator 2 that separates gas and liquid, and a check valve 3, and is stored in a near reservoir 4 as needed. is supplied as braking force.

The pressure in the near reservoir 4 is supplied to the unloader valve 6 of the near compressor 1 via the pressure regulator valve 5.
to maintain the pressure in the near reservoir 4 at an optimal state.

In such a brake air system, in the present invention, the valve device of the pressure alarm device is installed by bypassing the constricted portions such as the separator 2 and the check valve 3, which are likely to cause clogging of the air piping connecting the near compressor 1 and the near reservoir 4.

An example of the pressure alarm device is shown in FIGS. 2 and 3.

In the figure, a valve device 11 has an inlet 12 connected to an airline A on the upstream side of the separator 2, and an outlet 1 connected to an airline A connecting the separator 2 and the check valve 3.
3, and is provided so as to bypass the separator 2.

The valve body 10 is seated and is elastically biased by a spring 14 so as to cut off communication between the inlet 12 and the outlet 13.

The valve body 10 includes a rod portion 15 that can freely slide within the main body 11, and a sensing end 18 of a stroke switch 17 as a valve open sensing switch is elastically biased into a groove 16 formed on the outer circumference of the rod portion 15. It has become ingrown.

The stroke switch 17 is turned OFF when the sensing end 18 is recessed into the groove 16, and the rod portion 15 is
This is a switch that is turned on when the sensing end 18 is lifted out of the groove 16 by stroke when the valve 0 is opened.This switch is connected to the series circuit of the battery 21 and main switch 22 shown in Fig. 3, and is further placed near the driver's seat. It is connected in series to a parallel circuit of an alarm lamp 23 and an alarm buzzer 24 as alarm means.

Therefore, when the separator 2 becomes clogged, a pressure difference is generated between the inlet 12 and the outlet 13, and when this pressure difference exceeds a predetermined value, the valve body 10 overcomes the force of the spring 14 and strokes. Detecting this movement, the stroke switch 17 turns ON, and the circuit of the battery 21, main switch 22, double warning pump 23, or alarm buzzer 24 closes, lighting up the lamp 23 and sounding the buzzer 24, alerting the driver to a dangerous situation. Alert.

At the same time, by opening the valve, the abnormal pressure in the airline A is led through the discharge port 13 to just before the check valve 3 of the airline A, and the pressure drops.

In this way, even if air line A becomes clogged, the air bypasses the clogging point and is led back to airline A and into the near reservoir 4, so the pressure inside the near reservoir 4 decreases. Since normal pressure can be maintained without any clogging, braking performance does not deteriorate even in the event of such clogging, resulting in high safety.

However, since the cause of the abnormal pressure increase has not been eliminated, the driver must stop driving and repair and inspect each part of the brake system.

Note that the valve other than the stroke switch 17 is a known safety valve.

Note that the sensing end 18 of the stroke switch 17 can have the same effect even if it is located at the tip of the rod portion 15 as shown in FIG.
It goes without saying that it may be installed at a location on the upstream side of the airline where clogging is likely to occur.

In this case, the cause of the pressure abnormality is on the downstream side of the valve device main body 11, so it is only necessary to inspect the downstream side.

In this embodiment, the separator 2 is bypassed, but the connection is not limited to this.

In short, it is sufficient to configure the air line so that a portion of the air line that is likely to be clogged is bypassed.

As described above, according to the present invention, abnormal pressure in the brake air system is sensed and an alarm is issued, so that it is possible to know the clogging of the air line or other occurrence that may be the cause.

Moreover, since air can be supplied to the near reservoir by bypassing the clogged part, it is possible to prevent pressure drop in the near reservoir when it is clogged, prevent emergency situations due to insufficient braking force, and prevent abnormal pressure from occurring in various parts of the brake system. Damage can be prevented.

In addition, since the pressure in the near reservoir can be directly adjusted without being affected by the pressure in the brake air system upstream of the near reservoir, the pressure in the near reservoir is stable and the control section downstream of the near reservoir can operate extremely well. This can further increase safety.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the present invention, Fig. 2 is a sectional view of a valve device of a pressure alarm device showing an embodiment of the invention, and Fig. 3 is an electric circuit of the alarm device used in the above. FIG. 4 shows a modification of FIG. 2. 1... Near compressor, 2... Separator, 4... Near reservoir, A...
Air line, 10... Valve body, 11...
Valve device body, 12... Inlet, 13...
Discharge port, 16...Groove, 17...Stroke switch.

Claims (1)

[Scope of utility model registration request] The brake air system is provided to bypass a constriction part that is prone to clogging in the brake air system upstream of the near reservoir, where internal pressure is returned to the near compressor via a pressure regulator, and the pressure on the upstream and downstream sides of the constriction part is adjusted. a valve device that opens to communicate the upstream side and the downstream side when the differential pressure is in an abnormal state equal to or higher than a predetermined value; a valve open detection switch that detects that the valve device is opened; 1. A pressure alarm device for a brake air system, comprising: alarm means for issuing an alarm when a switch detects an opening of a valve device.