JPS6316631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic operated valve used for supplying pressurized air to pneumatic equipment such as brake actuators for railway vehicles, and for discharging pressurized air from the pneumatic equipment. .

As shown in FIG. 4, a conventional electromagnetically operated valve 70 is connected to a pneumatic source 72 via a pipe 71 and to a pneumatic device 74 via a pipe 73. When the valve 70 is demagnetized, its internal passage is as shown by the solid line, and the pneumatic equipment 74 is connected to the atmosphere via the pipe 73, and when the valve 70 is energized, its internal passage is as shown by the dotted line, and the pneumatic equipment 74 is connected to the atmosphere through the pipe 73. Pressurized air from the source 72 is supplied to the pipe 71,
It is supplied to pneumatic equipment 74 via 73.

In this case, a spring action/pneumatic release type brake actuator 74 used in a parking brake system for a railway vehicle is illustrated as the pneumatic device. This brake actuator 74 has a built-in piston 76 and a spring 77, and an action chamber 75 formed on the left side of the piston 76.
When the spring 77 is unpressurized, the force of the spring 77 is transmitted to the basic brake mechanism (not shown) through the piston 76 and the piston rod 78, and when the parking brake is applied to the vehicle and the working chamber 75 is pressurized, piston 76
The spring 77 is compressed and moved to the right, and the parking brake is released.

In this way, the pneumatic equipment 74, that is, the brake actuator 74 in this case, is controlled by demagnetizing or energizing the electromagnetically operated valve 70, but this electromagnetically operated valve 70 is said to be prone to malfunction. There's a problem.

The cause of this problem is that the excitation time of the electromagnetically operated valve becomes very long depending on the model of the pneumatic equipment.
For example, when the parking brake is controlled by this electromagnetic valve as shown in Figure 4, the parking brake needs to be released during normal train operation, so the electromagnetic valve is energized for a long time. This will continue to be the case.

Due to such long-term excitation, the electromagnetic coil may be burnt out due to temperature rise, and may not operate during demagnetization after long-term excitation due to residual magnetism or sticking phenomenon.

Therefore, the technical object of the present invention is to provide an electromagnetically operated valve having a structure that does not require long-term excitation.

As a technical means for solving this problem, the solenoid operated valve according to the present invention connects a pilot chamber, a first solenoid valve that connects the pilot chamber to the atmosphere when energized, and a first solenoid valve that connects the pilot chamber to the atmosphere when energized. The second solenoid valve connected, the feeding chamber connected to the pneumatic equipment, the large piston part that generates output in one direction in response to the pressure of the pilot chamber, and the output in the opposite direction in response to the pressure in the feeding chamber. a pilot piston having a small piston portion that moves from a first position to a second position when the pilot chamber is pressurized; a retaining spring that presses the pilot piston in the direction of the first position; and a pilot chamber and a feeding chamber. The pilot piston is actuated by the pilot piston to establish communication between the delivery chamber and the atmosphere at the first position of the pilot piston, and to establish communication between the delivery chamber and the atmosphere at the second position of the pilot piston. It is composed of a supply/discharge valve section that establishes communication with a pressure source.

Therefore, when the first solenoid valve is energized, the pilot chamber becomes pressureless, the pilot piston assumes the first position by the retaining spring, the feeding chamber is connected to the atmosphere by the supply/discharge valve section, and then the first solenoid valve is energized. Even when the valve is demagnetized, the pilot piston is self-held in the first position by the retaining spring. Furthermore, when the second solenoid valve is energized, the pilot chamber is pressurized and the pilot piston takes the second position, the feeding chamber is connected to the air pressure source by the supply/discharge valve section, and then the second solenoid valve is demagnetized. Since the pilot chamber is supplied with pressurized air from the delivery chamber through a passage with a throttle hole, the pilot piston is self-held in the second position by the air pressure acting on the area difference between the large piston section and the small piston section. Ru.

As mentioned above, in this electromagnetic operated valve, the pilot piston is self-held in both the first and second positions, so there is no need to excite the first and second electromagnetic valves for a long time, and the above-mentioned problem is completely solved. It will be resolved in

As another technical means for solving the above-mentioned problem, it is also possible to omit the pilot piston and the supply/discharge valve section and connect the pilot chamber directly to the pneumatic equipment. In this case as well, it is not necessary to energize each electromagnetic valve for a long time, but there is a problem in that the pressure air supplied to the pneumatic equipment leaks to the outside over a long period of time and its pressure naturally decreases. In the technical means according to the present invention, since the pneumatic equipment is connected to the pneumatic pressure source by the supply/discharge valve part, the pressure will not drop even if there is some leakage. There are specific effects that result from this.

Next, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 2, the electromagnetic operated valve 1 includes a first electromagnetic valve 5, a second electromagnetic valve 4, a pilot chamber 43, and a feeding chamber 3.
6, a pilot piston 34, a retaining spring 37, a passage 44 with a throttle hole, and a supply/discharge valve section including a supply/discharge valve 32.

The plunger 14 of the first solenoid valve 5 is normally seated on the valve seat 50 as shown in the figure by a spring 15, and when excited, moves upward and leaves the valve seat 50. 48, a passage 51, and a strainer 52 to connect to the atmosphere.

The plunger 12 of the second solenoid valve 4 is normally seated on the valve seat 41 as shown in the figure by a spring 13, and when excited, moves upward and leaves the valve seat 46. 24, aisle 27,2
6, 25, the chamber 22 and the passage 23 shown in FIG.
It is connected via an inlet 19 to a pneumatic source.

As shown in FIGS. 1 and 3, the electromagnetic valves 4 and 5 are provided with operating tools having the same structure and including push buttons 55 and 56, respectively. The inner end of the operating tool is formed with a conical portion, which is generally spaced apart from the plunger 12 as shown by a spring 62, and which is activated by the conical portion when the pushbutton 55 is pushed inwardly. The plunger 12 is pushed upward,
The valve seat 46 is removed. This operating tool is thus used to operate the solenoid valve without energizing it.

The pilot piston 34 has a large piston section at the top and a small piston section at the bottom, and the upper surface of the large piston section receives the pressure of the pilot chamber 43.
The lower surface of the small piston part receives pressure from the delivery chamber 36. The feeding chamber 36 is connected to the passage 3 as shown in FIG.
8. Always connected to pneumatic equipment via outlet 20.

The pilot chamber 43 and the feeding chamber 36 are connected to the throttle hole 45.
It is communicated by a passageway 44 including a passage.

Further, the chamber 39 formed between the large piston part and the small piston part has a passage 42 and a hole 1 as shown in FIG.
8. It is always in communication with the atmosphere through the exhaust port 21.

The retaining spring 37 constantly presses the pilot piston 34 upwardly and holds the pilot piston 34 in the first position shown when the pilot chamber 43 is unpressurized.

The supply/discharge valve section is composed of a supply/discharge valve 32, a supply valve seat formed on the main body, an exhaust valve seat 33 formed at the lower end of a pilot piston 34, and a spring 30, and the pilot piston 34 is in the first position shown. At this time, the valve face 29 of the supply/discharge valve 32 is seated on the supply valve seat by the spring 30, and the exhaust valve seat 33 is separated from the valve face 29. Therefore, the delivery chamber 36 communicates with the atmosphere through the center holes 40, 41 of the pilot piston 34 and the chamber 39.

Next, the operation of this electromagnetically operated valve 1 will be explained.

When the second solenoid valve 4 is energized when each part of the solenoid-operated valve 1 is in the illustrated position, the plunger 12 is separated from the valve seat 46, and the pressurized air from the pneumatic source is supplied to the inlet 1.
9, passage 23, chamber 22, passages 25, 26, 27 and 47 into the pilot chamber 43, where the pilot piston 34 compresses the retaining spring and moves downward to assume the second position. Therefore, the exhaust valve seat 33 is seated on the valve surface 29 of the supply/discharge valve 32, and the communication between the delivery chamber 36 and the atmosphere is cut off, and at the same time, the valve surface 29 is separated from the supply valve seat, and the pressurized air of the pneumatic source is removed. is entrance 19, passage 2
3. It flows into the delivery chamber 36 through the chamber 22, and is further supplied to the pneumatic equipment through the passage 38 and the outlet 20.

After that, the second solenoid valve 4 is demagnetized, and the plunger 1
2 is seated on the valve seat 46, the pilot chamber 43 is supplied with pressurized air from the delivery chamber 36 through the passageway 44 with a throttle hole, so the air pressure acting on the difference in area between the large piston portion and the small piston portion The pilot piston 34 is self-retained in the second position.
In this case, since the pilot chamber 43 and the delivery chamber 36 are connected to a large-capacity air pressure source, the pressure is maintained for a long time even if there is some air leakage from each part.

When each part of the electromagnetically operated valve 1 is in the above-mentioned state,
When the first electromagnetic valve 5 is energized, the plunger 14 is removed from the valve seat 50, the pressurized air in the pilot chamber 43 is discharged to the atmosphere through the passages 49, 51 and the strainer 52, and the pilot piston 34 is A feeding chamber 36 that acts on the piston part
is moved upward by the pressure of , and returns to the first position shown.
Therefore, the valve surface 29 of the supply/discharge valve 32 is seated on the supply valve seat, and communication between the delivery chamber 36 and the air pressure source is cut off, and at the same time, the exhaust valve seat 33 is separated from the valve surface 29, and the delivery chamber 34
The pressurized air and the pressurized air supplied to the pneumatic equipment are discharged to the atmosphere through the passages 40, 41, the chamber 39, the passage 42, and the exhaust port 21. In this case, the pressure in the delivery chamber acting on the lower surface of the small piston part disappears, but the pilot piston 34 is self-held in the first position by the retaining spring 37.

Thereafter, even if the first solenoid valve 5 is demagnetized and the plunger 14 is seated on the valve seat 50, the pilot chamber 43
is connected to the atmosphere through the passage 44 and the delivery chamber 36, so air leakage may cause damage to the pilot chamber 4.
3 does not increase in pressure, and the pilot piston 34 is held in the first position for a long period of time.

As is clear from the above explanation, in this electromagnetically operated valve 1, there is no need to excite the electromagnetic valves 4 and 5 for a long time, and the above-mentioned problem is completely solved.

[Brief explanation of the drawing]

Fig. 1 is a side view of an electromagnetically operated valve showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, Fig. 3 is a plan view of the electromagnetically actuated valve, and Fig. 4 is a conventional electromagnetically operated valve. FIG. 2 is an explanatory diagram of an electromagnetically operated valve according to the technology; 1...Solenoid operated valve, 4...Second solenoid valve, 5...
First solenoid valve, 34...Pilot piston, 36
... Feeding chamber, 37 ... Maintaining spring, 43 ... Pilot chamber, 44 ... Passage with throttle hole, 72 ... Pneumatic pressure source, 74 ... Pneumatic equipment (brake actuator).

Claims (1)

[Scope of Claims] 1. An electromagnetic operated valve that is used for supplying pressurized air to or discharging pressurized air from pneumatic equipment, and is composed of the following parts. (a) a pilot chamber; (b) a first solenoid valve which, when energized, connects the pilot chamber to the atmosphere; (c) a second solenoid valve, which, when energized, connects the pilot chamber to a source of air pressure; (d) a second solenoid valve, which connects the pilot chamber to the air when energized; A feeding chamber (e) communicating with the pressure equipment, having a large piston section that generates an output in one direction in response to the pressure in the pilot chamber, and a small piston section that generates an output in the opposite direction in response to the pressure in the feeding chamber. , a pilot piston that moves from a first position to a second position when said pilot chamber is pressurized; (f) a retaining spring that presses said pilot piston toward said first position; (g) said pilot chamber and said piston; (h) actuated by the pilot piston to establish communication between the delivery chamber and the atmosphere at the first position of the pilot piston; A supply/discharge valve portion establishes communication between the delivery chamber and the air pressure source at the second position of the pilot piston. 2. The electromagnetically operated valve according to claim 1, wherein the pneumatic device is a spring action/pneumatic release type brake actuator used in railway vehicles.