JPS6078184A - Electromagnetic operating valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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. 1, a conventional electromagnetically operated valve 70 is connected to a pneumatic source 7 via a pipe 7/ and to a pneumatic device 7 via a pipe 73. When valve 0 is demagnetized, its internal passage is as shown by the solid line, and the pneumatic equipment 74' is connected to pipe 7.
When the valve 70 is energized, its internal passage becomes as shown by the dotted line, and the pressurized air from the air pressure source is supplied to the seven pneumatic devices through the pipes 7/73.

As the pneumatic device, a spring action/pneumatic release type brake actuator 7da used in a parking brake system for a railway vehicle is exemplified in this case. This brake actuator 74' has a built-in piston 76 and a spring 7, and when the action chamber 7S formed on the left side of the piston 76 is unpressurized, the force of the spring 7 is applied via the piston 76 and the piston rod 7g. When the parking brake is applied to the vehicle and the operating chamber 5 is pressurized, the piston 76 compresses the spring 77 and moves to the right, releasing the parking brake.

In this way, the pneumatic equipment 741, that is, the brake actuator in this case, is controlled by demagnetizing or energizing the electromagnetically operated valve 70, but this electromagnetically operated valve 70 has the problem of being prone to malfunction. be.

The cause of this problem is that the excitation time of the electromagnetically operated valve becomes extremely long depending on the type of pneumatic equipment. For example, when the parking brake is controlled by this electromagnetic valve as shown in Figure 9, the parking brake must be loosened during normal train operation, so the electromagnetic valve remains energized for a long time. It turns out.

Due to such long-term excitation, the electromagnetic coil tends to burn 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 problem 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 to solve this problem, the electromagnetically operated valve according to the present invention includes a pilot chamber, a first electromagnetic valve that connects the pilot chamber to the atmosphere when energized, and a first electromagnetic valve that connects the pilot chamber to the atmosphere when energized. The connected solenoid valve, the feeding chamber that communicates with the pneumatic equipment, and the large piston section that generates output in one direction in response to the pressure of the pilot chamber and the pressure in the feeding chamber that generates output in the opposite direction. a 7-inch 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 suppresses the pilot piston in the direction of the first position; A throttle hole road formed between the pilot piston and the flow chamber is actuated by the pilot piston to establish communication between the feeding chamber and the atmosphere at the first position of the pilot piston, and to establish communication between the feeding chamber and the atmosphere at the second position of the pilot piston. and a supply/discharge valve section that establishes communication with the air pressure source.

Therefore, when the first solenoid valve is energized, the pilot chamber becomes unpressurized, the pilot piston takes the first position by the retaining spring, the feeding chamber is connected to the atmosphere by the supply/discharge valve part, and then the first solenoid valve is demagnetized. The pilot piston is also self-held in the first position by a retaining spring. Also, when the No. 1 solenoid valve is energized, the pilot chamber is pressurized and the pilot piston takes the second position, and the feeding chamber is connected to the air pressure source by the supply/discharge valve section. Since the pilot chamber is supplied with pressurized air from the delivery chamber via a passage with a throttle hole, the pilot piston is moved to the second
Self-held in position.

As mentioned above, in this electromagnetically operated valve, the pilot pistons are self-held at both the 1st and 2nd positions, so there is no need to excite the first and second electromagnetic valves for a long time.
The aforementioned problems are completely eliminated.

Similarly, 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 directly connect the pilot chamber to the pneumatic equipment. In this case, it is not necessary to excite each solenoid valve for a long time, but there is a problem that the pressure air supplied to the pneumatic equipment leaks to the outside over a long period of time and the pressure naturally decreases. This invention In this technical measure, the pneumatic equipment is connected to the pneumatic source through the supply/discharge valve, so the pressure will not drop even if there is some leakage, and this is where the unique effect produced by this technical measure arises. 0 Next, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 2, the electromagnetic operated valve l is the 11th! , Solenoid valve!
, No. 1 Solenoid Valve, Pilot Room 11.7. Feeding chamber 36,
It is composed of a pilot piston 34', a retaining spring 37, a passageway 41+ with a throttle hole, and a supply/discharge valve section including supply/discharge valves 3 and 2.

The plunger of the first solenoid valve S is pushed by a spring 1 and seats on the valve seat SO as shown in the figure, and when excited, it moves upward and leaves the valve seat SO, and the pilot chamber DA 3 Is it connected to the atmosphere through passage 9, chamber 431 passage, 4-/, and strainer? - / is pushed by the spring 13 and normally sits on the valve seat 4 (A) as shown in the figure, and when it is energized, it moves upward and leaves the valve i 6, and the pilot chamber 4'J is located in the passage duct, The chamber is connected to the air pressure source through the passage shown in FIG. 1 and the 231st person 19.

As shown in FIGS. 7 and 3, operating tools of the same structure including push buttons 5Bzt are installed on the electromagnetic valves d and j, respectively. The inner end of the operating tool is formed with a conical portion which is normally connected to a plunger 7.2 by means of a spring 6 as shown.
When the push button 35 is pushed inward, the plunger saw is pushed upward by the conical portion and is separated from the valve seat 6. This operating tool is thus used to operate the solenoid valve without energizing it.

The pilot piston Jf is formed with a large piston part at the upper part and a small piston part at the lower part.The upper surface of the large piston part receives the pressure of the pilot chamber G3, and the lower surface of the small piston part receives the pressure of the feeding chamber J6. There is. As shown in FIG. 1, the feeding chamber 36 is always connected to pneumatic equipment via the passage 3t1 outlet 20.

The pilot chamber 3 and the delivery chamber 36 communicate with each other through a passage 4t4t including a throttle hole 4'j.

Also, a chamber 3 formed between the large piston part and the small piston part
As shown in Figure 1, q is the passageway, hole/za, and exhaust port J/
It is always in communication with the atmosphere through the

The retaining spring 3 always presses the pilot piston 311 upward and holds the pilot piston 31I in the first position shown when the pilot chamber lIj is unpressurized.

The supply and discharge valve section includes three supply and discharge valves, a supply valve seat formed on the main body, and an exhaust valve seat 33 formed at the lower end of the pilot piston 3da.
and a spring 30, a pilot piston, ?
When the valve is in the first position shown, the valve surface 29 of the three supply/discharge valves
The exhaust valve seat 33 is seated on the supply valve seat by the spring 3θ, and the exhaust valve seat 33 is separated from the valve surface 9. Therefore, the feeding chamber 36 is located in the center hole of the pilot piston 3D Oe'A/11A3? It communicates with the atmosphere through the

Next, the operation of this electromagnetically operated valve l will be explained.0 When the first electromagnetic valve S is energized when each part of the electromagnetically operated valve l is in the illustrated position, the plunger /λ is separated from the valve seat lI&, Pressurized air from the pneumatic source is supplied to the inlet 19, passage 3, chamber 2, and passage λj-, 2A.

27 and 4'7 into the pilot room II3,
The pilot piston Jll compresses the retaining spring and moves downward to assume the second position. Therefore, the exhaust valve seat 33 is seated on the valve surface 2q of the three supply/discharge valves, and communication between the delivery chamber 36 and the atmosphere is cut off, and at the same time, the valve surface 2q is seated on the valve surface 2q of the three supply/discharge valves. is removed from the supply valve seat, and the pressurized air from the pneumatic source is supplied to the inlet 19. It flows into the delivery chamber 36 through the passage 2J, chamber 2.2, and is further supplied to the pneumatic equipment through the passage 31r1 and the exit loco 0.

After that, the solenoid valve is demagnetized and the plunger saw is placed on the valve seat 4.
Even when seated in 'A', the pilot chamber lI3 is supplied with pressurized air from the delivery chamber 36 through the passageway 4III with the throttle hole, so the air pressure acting on the area difference between the large piston part and the small screw/ton part is The pilot piston 31I is the second
Self-held in position. In this case, since the pilot chamber 3 and the delivery chamber 36 are connected to a large capacity pneumatic source,
Even if there is some air leakage from each part, the pressure will be maintained for a long time.

When the first solenoid valve S is energized when each part of the solenoid-operated valve I is in the above-mentioned state, the plunger/da hits the valve seat! The pressurized air from the pilot chamber
1. The atmosphere is exhausted through the strainer 5, and the pilot piston 3q is moved upward by the pressure in the delivery chamber 36 acting on the retaining spring 3 and the small piston section, and
Return to position. Therefore, the valve faces 29 of the three supply valves are seated on the supply valve seats, and communication between the delivery chamber 36 and the air pressure source is cut off, and at the same time, the exhaust valve seats 33 are seated on the valve faces 2? The pressurized air in the delivery chamber 3 and the pressure air supplied to the pneumatic equipment are removed from the chamber 39, the passage λ, and the exhaust 0.2/.
In this case, the pressure in the delivery chamber acting on the lower surface of the small piston part disappears, but the pilot piston 31I is self-held in the first position by the retaining spring 3.

After that, even if the first solenoid valve 3 is demagnetized and the plunger/4' is seated on the valve seat SO, the pilot chamber 3 remains in the passage 1II.
Since the pilot piston 31.I is connected to the atmosphere through the delivery chamber 36, the pressure in the pilot chamber lIj will not increase due to air leakage, etc., and the pilot piston 31. ! is held in the first position for a long time.

As is clear from the above description, in this electromagnetically operated valve/, there is no need to energize the electromagnetic valves D and S for a long time, and the above-mentioned problem is completely solved.

[Brief Description of the Drawings] Fig. 1 is a side view of an electromagnetically operated valve showing one embodiment of the present invention;
FIG. 1 is a sectional view taken along line 1--1 in FIG. 1, FIG. 3 is a plan view of the electromagnetically operated valve, and FIG. l... Solenoid operated valve D... No. 1 solenoid valve 5... 1st solenoid valve-JII... Pilot piston 36...
・Feeding chamber IJri...Keeping spring 41J...Pilot chamber aq'4-Path with throttle hole 7.2...Pneumatic pressure source
7+...Pneumatic equipment (brake actuator). Engraving of the drawings (no change in content) ii j Te 3 Procedural amendment (voluntary) October 16, 1980 Manabu Shiga, Commissioner of the Patent Office 1, Indication of the case 1982 Patent Application No. 178542 2, Title of the invention Solenoid Operated Valve 3, Relationship with the Amended Person Case Name of Patent Applicant: American Standard Incorporated 4, Agent Address: 4th Floor (1), Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo 100 Application Form Column for the representative of the patent applicant (2) Document certifying power of representation (3) Drawing 6, contents of amendments (1) Submit an application stating the name of the patent applicant's representative as shown in the attached sheet. (2) Submit the attached power of attorney and its translation. (3) Submit the refined drawing (with no changes to the content).

Claims (2)

[Claims] (1) An electromagnetically operated valve used to supply pressurized air to or discharge pressurized air from the pneumatic equipment, and consisting of the following parts (ta) Pilot chamber (b) When energized The 111th solenoid valve (C) connects the pilot chamber to the atmosphere. The λ solenoid valve (d) connects the pilot chamber to the pneumatic source when excited. The feeding chamber (θ) communicates with the pneumatic equipment. The pilot It has a large piston part that generates an output in one direction in response to the pressure in the chamber, and a small piston part that generates an output in the opposite direction in response to the pressure in the delivery chamber, and when the pilot chamber is pressurized, the a pilot piston that moves from the first position to the fourth position; (f) a retaining spring that presses the pilot piston in the direction of the g1 position c; (g) with a throttle hole formed between the pilot chamber and the feeding chamber; passage, and -) actuated by said pilot piston;
A supply/discharge valve section that establishes communication between the delivery chamber and the atmosphere at the first position of the pilot piston, and 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.