JPS6217664Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a non-sliding solenoid valve using a poppet valve.

[Conventional technology]

In general, this type of solenoid valve does not have a sliding seal, so it is more suitable as an oil-free solenoid valve than other types of solenoid valves that use spool valves, etc.
Even if the solenoid is energized and switched, if the solenoid is deenergized, the switching position cannot be maintained, and the solenoid must be continuously energized to maintain the switching position.

Therefore, conventional solenoid valves are
As shown in the publication, by supplying a portion of the pressure gas from the pressure gas source to the pilot section through the switching operation of the poppet valve, the switching position of the poppet valve after demagnetization of the solenoid is self-maintained, and the switching operation from the pilot section After the pressure gas was exhausted, the poppet valve was self-retained by a spring force.

[Problem that the invention attempts to solve]

However, with such conventional solenoid valves, one switching position of the poppet valve is self-maintained by mechanical spring force, so it is difficult to maintain the switching position of the poppet valve reliably against vibrations and various usage conditions. There was a problem that the spring could not be maintained and the spring could be damaged due to repeated loading over a long period of time, making it impossible to maintain the initial performance over a long period of time.

The cause of this problem lies in the fact that the poppet valve can be self-retained using spring force and air pressure.

[Means for solving problems]

Therefore, the present invention was devised in view of the above-mentioned problems, and the technical problem is to perform self-retention of the poppet valve using only air pressure.

The technical means for achieving this goal consists of first and second main valve sections each having a poppet valve that is connected to a pressure gas source and switches the supply/discharge path by the pressure of the pilot section, and these main valve sections. first and second valves correspondingly connected to a source of pressurized gas to open the pilot passage and close the exhaust passage by energizing the solenoid;
an electromagnetic actuating part, a first electromagnetic actuating part, and first and second electromagnetic actuating parts.
A first valve is provided between one pilot part of the main valve part of the main valve part with the pilot part direction being the forward direction, and allows flow in the opposite direction by the pressure of the other pilot part of the first and second main valve parts. A pilot check valve is provided between the second electromagnetic actuating part and the other pilot part of the first and second main valve parts, with the pilot part direction being the forward direction, and the first and second main valve parts A second pilot check valve is provided which allows flow in the opposite direction depending on the pressure of one of the pilot parts.

[Effect]

According to this means, when the solenoid of the first electromagnetic actuating part is excited, the first pilot part of the first and second main valve parts corresponding to this electromagnetic actuating part is
Pressure gas is supplied through the pilot check valve to generate pilot pressure, and this pilot pressure causes the other pilot section of the first and second main valve sections to exhaust air through the second pilot check valve. Therefore, both main valve sections are switched respectively. When the solenoid is demagnetized in this switched state, the first pilot check valve closes and pilot pressure is sealed in one of the first and second main valve parts.
This pilot pressure enables self-holding. Furthermore, when the solenoid of the second electromagnetic actuation section is energized, pilot pressure is supplied to the other pilot section of the first and second main valve sections, and one pilot section operates the first pilot check valve. Therefore, both main valve sections are switched, and in this switched state, when the solenoid is demagnetized, the second pilot check valve closes and the other pilot of the first and second main valve sections is closed. Pilot pressure is sealed in the part, and this pilot pressure enables self-retention.

[Effect of idea]

Therefore, according to the present invention, it is possible to self-maintain the switching position of the poppet valve only by air pressure by the action of the first and second pilot check valves, and it is possible to self-maintain the switching position of the poppet valve by using only air pressure. The switching position of the poppet valve can be reliably held without requiring any holding force. Furthermore, since it does not have mechanical elements such as springs, the switching operation of the poppet valve is reliable, and it has the effect of being able to withstand long-term use.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments.

Fig. 1 is a cross-sectional view of one embodiment, Fig. 2 is a cross-sectional view taken along line A--A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line E-A in Fig. 1. This is an inlet port bored in the main body P and connected to a pressure gas source (not shown), and a first main valve part 1 and a second main valve part 2 are arranged on both sides of the inlet port P. A first electromagnetic actuating part 3 and a second electromagnetic actuating part 4 are provided at both ends of O.
A first pilot check valve 5 is arranged between the first electromagnetic actuation part 3 and the second main valve part 2, and a first pilot check valve 5 is arranged between the second electromagnetic actuation part 4 and the first main valve part 1. A second pilot check valve 6 is disposed between the
Furthermore, a shuttle valve 7 is provided near the inlet port P.

In FIG. 1, the first main valve part 1 includes an outlet port A connected to an actuator (not shown);
It has an exhaust port R1, a poppet valve 11, and a pilot section 12. An air supply valve seat 13 is formed between the outlet port A and the inlet port P on which the poppet valve 11 is seated, and an exhaust valve on which the poppet valve 11 is seated is formed between the outlet port A and the exhaust port R1. A seat 14 is formed. The poppet valve 11 includes a shaft 11a having screws screwed on both ends, and a shaft 11a having screws screwed on both ends.
A holding member 11b and a nut 11c are attached to both ends of a.
The diaphragm 8 is fixed by a diaphragm 8. The pilot portion 12 is a main pilot portion 1 formed in a lower passage 9a of the poppet valve 11 in the figure.
2a, and an auxiliary pilot portion 12b formed in the upper passage 9b of the poppet valve 11 in the figure.

In the first main valve section 1 configured in this way, pressure gas is supplied to the main pilot section 12a (passage 9a), and the auxiliary pilot section 12b (passage 9b)
When the main pilot section 12a is exhausted, the outlet port A is connected to the inlet port P. Conversely, when the auxiliary pilot section 12b is supplied with pressurized gas, and the main pilot section 12a is exhausted, the outlet port A is connected to the exhaust port R1. Connecting.

Similar to this first main valve part 1, a second main valve part 2
are an outlet port B connected to an actuator (not shown), an exhaust port R2, a poppet valve 21,
It has a pilot section 22. An air supply valve seat 23 on which a poppet valve 21 is seated is formed between the outlet port B and the inlet port P, and an exhaust valve on which the poppet valve 21 is seated and separated is formed between the outlet port B and the exhaust port R2. A seat 24 is formed. Poppet valve 21
a shaft 21a with screws screwed on both ends;
It is comprised of a diaphragm 8 fixed to both ends of the shaft 21a by a pressing member 21b and a nut 21c. The pilot portion 22 includes a main pilot portion 22a formed in the upper passage 9b of the poppet valve 21 in the figure, and an auxiliary pilot portion 22 formed in the lower passage 9a of the poppet valve 21 in the figure.
b, and the main pilot part 22a has a passage 9.
By b, the auxiliary pilot part 12 of the first main valve part 1
b, and the auxiliary pilot part 22b communicates with the passage 9a.
It communicates with the main pilot part 12a of the first main valve part 1 by.

The second main valve section 2 configured in this way has its main pilot section 22a (passage 9b) supplied with pressurized gas, and the auxiliary pilot section 22b (passage 9a)
When the main pilot section 22a is exhausted, the outlet port B is connected to the inlet port P, and conversely, when the auxiliary pilot section 22b is supplied with pressurized gas, and the main pilot section 22a is exhausted, the outlet port B is connected to the exhaust port R2. Connecting.

In FIG. 1, the first electromagnetic actuating part 3 provided at the right end of the main body O is fitted into a solenoid 32 provided in a support body 31 and to the right side of the inner hole of the support body 31, and is fitted into an exhaust hole 33a. The stopper member 3 is drilled with
3, a movable iron core 35 that is slidably fitted into the inner hole of the support body 31 via a return spring 34, and has an exhaust passage 35a cut in the axial direction (left-right direction in the figure); and the movable iron core. A pilot valve 36 is provided at the left end of the movable iron core 35 in the figure and is seated on a pilot valve seat 36a in the main body O, and a stopper member 33 is provided at the right end of the movable iron core 35 in the figure via a valve spring 37a. The exhaust valve 37 seats on and leaves an exhaust valve seat 33b formed around the left end in the figure of the exhaust hole 33a. The pilot passage 36b of the pilot valve seat 36a communicates with the inlet port P via a supply passage 38 within the main body O.

The first electromagnetic actuating section 3 configured in this way is
When the solenoid 32 is demagnetized, the return spring 34 closes the pilot passage 36b (pilot valve seat 36a) and closes the exhaust passage 35.
a (exhaust valve seat 35b) and when the solenoid 32 is energized, the suction force against the return spring 34 opens the pilot passage 36b (exhaust valve seat 36).
a) and opens the exhaust passage 35a (exhaust valve seat 35).
Close b).

Similar to the first electromagnetic actuating part 3, the second electromagnetic actuating part 4 provided at the left end of the main body O includes a solenoid 42 provided on the support 41 and a solenoid 42 provided on the support 41.
A stopper member 43 is fitted into the left side of the inner hole of the support body 41 and has an exhaust hole 43a, and the stopper member 43 is slidably fitted into the inner hole of the support body 41 via a return spring 44. ), a movable iron core 45 having an exhaust passage 45a cut therein, a pilot valve 46 provided at the right end of the movable iron core 45 and seated on and removed from a pilot valve seat 46a in the main body O, and the movable iron core 45. The exhaust valve 47 is provided at the left end of the stopper member 43 via a valve spring 47a, and seats on and leaves an exhaust valve seat 43b formed around the right end of the exhaust hole 43a of the stopper member 43. The pilot passage 46b of the pilot valve seat 46a communicates with the inlet port P via a supply passage 48 within the main body O.

The second electromagnetic actuator 4 configured in this way is
When the solenoid 42 is demagnetized, the return spring 44 closes the pilot passage 46b (pilot valve seat 46a) and closes the exhaust passage 45.
a (exhaust valve seat 45b) is opened, and when the solenoid 42 is excited, the suction force against the return spring 44 opens the pilot passage 46b (exhaust valve seat 46).
a) and opens the exhaust passage 45a (exhaust valve seat 45).
Close b).

In FIG. 2, the first pilot check valve 5 has an intermediate body 51, a piston 52, and a check valve 53. The intermediate body 51 is fitted into an inner hole 50 that communicates with the passage 9a, and a valve seat 51a is formed in the intermediate body 51, and a communication passage 54 ( 1st
A hole 51b is drilled through the hole 51b, which is in continuous communication through the hole 51b (see figure). The piston 52 is loosely fitted into the hole 51b of the intermediate body 51, and the diaphragm 8
is fixed to the passage 9b, that is, the second main valve portion 2.
The main pilot section 22 of the main pilot section 22 is operated by pressure. The check valve 53 is inserted into the inner hole 50 via a valve spring 53a so that the forward direction is from the hole 51b of the intermediate body 51 to the passage 9a.
A large diameter portion 53c (upper end in the figure) having a cut-out portion is adapted to be seated on and removed from the valve seat 51a of the intermediate body 51. Further, one opening end of the supply hole 55 is closed off from the supply passage 38 of the main body O by a blind plug 59, and the other opening end of the supply hole 55 opens into the inner hole 50, and a valve seat 55a is attached to the opening end of the supply hole 55. The valve seat 55a
The small diameter portion 53d (lower end in the figure) of the check valve 53 is configured to be seated and removed from the seat.

This first pilot check valve 5 is activated when the solenoid 32 of the first electromagnetic actuating section 3 is excited and the pilot passage 36b is opened, that is, the supply passage 38, the pilot passage 36b, and the communication passage 5 are activated.
Pressure gas from the inlet port P via the hole 51
b, the large diameter portion 53c of the check valve 53 is removed from the valve seat 51a against the valve spring 53a, and the small diameter portion 53d of the check valve 53 is seated on the valve seat 55a, thereby opening the hole 51b. passes through the groove 53b to the passage 9a (the main pilot part 1 of the first main valve part 1).
2). At this time, the solenoid 42 of the second electromagnetic actuating section 4 is demagnetized, and the passage 9b (second
The main pilot section 22) of the main valve section 2 is evacuated. Conversely, the solenoid 3 of the first electromagnetic actuator 3
2 is demagnetized, and the solenoid 4 of the second electromagnetic actuating part 4
2 is energized, the piston 52 is pressed by the pilot pressure in the passage 9b, and the large diameter portion 53c of the check valve 53 is separated from the valve seat 51a.
The passage 9a has a groove 53b, a hole 51b, a communication passage 54,
The air is exhausted through the exhaust passage 35a and the exhaust hole 33a.

The second pilot check valve 6 has the same structure as the first pilot check valve 5 described above, so a description thereof will be omitted.

In FIG. 3, 70 is an inner hole bored in the main body O and communicating with the inlet port P. The inner hole 70 has a communication hole 71 communicating with the passage 9a and a communication hole 72 communicating with the passage 9b. Each is open, and valve seats 71a and 72a are formed around these open ends, respectively. The shuttle valve 7 is loosely fitted into the inner hole 70, and its inner end is configured to be seated on and removed from valve seats 71a and 72a, respectively. Note that the gap between the outer periphery of the shuttle valve 7 and the inner hole 70 narrows and communicates the inlet port P with the passages 9a and 9b.

When pressurized gas is supplied to the passage 9a through the first pilot check valve 5, i.e., when pilot pressure is generated in the first main valve section 1, the shuttle valve 7 moves upward in the figure, lifting off the valve seat 71a and seating on the valve seat 72a, thereby communicating the inlet port P and the passage 9a through the communication hole 71. Conversely, when pressurized gas is supplied to the passage 9b (the main pilot section 22 of the second main valve section 2), the communication hole 72 closes the communication hole 72.
The inlet port P and the passage 9b communicate with each other via the inlet port P and the passage 9b.

I have explained each component individually above, but
Next, the operation will be explained based on FIGS. 4 and 5.

FIG. 4 shows the solenoid 3 of the first electromagnetic actuator 3.
2 is energized and the solenoid 42 of the second electromagnetic actuator 4 is demagnetized. When the solenoid 32 is energized, the suction force of the movable iron core 35 resisting the return spring 34 causes the pilot valve 36 to be unseated from the pilot valve seat 36a, and the pilot passage 36b and the communication passage 54 communicate with each other, and the exhaust gas is The valve 37 is seated on the exhaust valve seat 33b and the exhaust passage 35
The communication between a and the exhaust hole 33a is cut off. At this time,
Since the solenoid 42 of the second electromagnetic actuator 4 is demagnetized, the pilot valve 46 is closed to the pilot valve seat 4.
6a, the pilot passage 46b is closed, and the exhaust valve 47 is removed from the exhaust valve seat 43b, so that the exhaust passage 45a communicates with the exhaust hole 43a.

By opening the pilot passage 36b of the first electromagnetic actuator 3, pressure gas from the inlet port P is supplied to the hole 51b of the first pilot check valve 5 via the communication passage 54, and the check valve 53 is opened. The diameter portion 53c is pressed to separate from the valve seat 51a. This pressure gas then passes through the first pilot check valve 5 to the main pilot section 12a of the first main valve section 1 and the auxiliary pilot section 2 of the second main valve section 2.
2b, that is, the passage 9a.

The pressurized gas supplied to this passage 9a presses the check valve 63 via the piston 62 of the second pilot check valve 6, and causes its large diameter portion 63c to separate from the valve seat 61a. Therefore, the auxiliary pilot section 12b of the first main valve section 1 and the main pilot section 22a of the second main valve section 2, that is, the passage 9b,
It communicates with the exhaust hole 43a through the pilot check valve 6, the communication passage 64, and the exhaust passage 45a. The second pilot check valve 6 thus allows flow in the opposite direction.

In this way, when pilot pressure is generated in the passage 9a and the passage 9b is exhausted, the poppet valve 11 of the first main valve section 1 is seated on the exhaust valve seat 14 and is unseated from the air supply valve seat 13. do. Therefore, in the first main valve part 1, the outlet port A and the exhaust port R1 are completely disconnected, and the outlet port A is communicated with the inlet port P. At the same time, the poppet valve 21 of the second main valve section 2 is seated on the air supply valve seat 23 and removed from the exhaust valve seat 24. Therefore, in the second main valve portion 2, the outlet port B and the inlet port P are completely disconnected, and the outlet port B communicates with the exhaust port R2. At this time, the shuttle valve 7 moves upward in the figure due to the pressure difference between the passages 9a and 9b, leaves the valve seat 71a, seats on the valve seat 72a, and passes through the communication hole 71a to the inlet port P. and the passage 9a are communicated with each other.

In this way, when the solenoid 32 of the first electromagnetic actuator 3 is energized and both main valve parts 1 and 2 are in the switching position shown in FIG. 4, even if the solenoid 32 is deenergized, both main valve parts 1 and 2 maintain this switching position.

That is, when the solenoid 32 is demagnetized, the movable iron core 35 is moved to the left in the figure by the return spring 34, the exhaust valve 37 is unseated from the exhaust valve seat 33b, and the exhaust passage 35a communicates with the exhaust hole 33a.
Pilot valve 36 seats on pilot valve seat 36a and closes pilot passage 36b. Therefore, the hole 51b of the first pilot check valve 5 communicates with the exhaust hole 33a via the communication passage 54 and the exhaust passage 35a, but the check valve 53 is pressed by the valve spring 53a, and the passage 9a Since the large diameter portion 53c is receiving the gas pressure of the valve seat 51a, the large diameter portion 53c
The flow from the passage 9a to the communication passage 54, that is, the flow in the opposite direction is blocked. At this time, the shuttle valve 7 remains in the above-described state, and the inlet port P remains in communication with the passage 9a. Thus, this solenoid valve maintains the above-mentioned switching position for a long time even when the solenoid 32 is deenergized.

Further, FIG. 5 shows a state in which the solenoid 32 of the first electromagnetic actuator 3 is demagnetized and the solenoid 42 of the second electromagnetic actuator 4 is energized, and the actions of each component at this time are as follows. Since it only works in the opposite manner to the case of FIG. 4 described above, its explanation will be omitted.

In the above embodiment, when the solenoid of either the first or second electromagnetic actuator is energized and switched, and then the solenoid is deenergized, the pilot check valve closes and the pressure is reduced through the check valve. Even if the gas supply is cut off, the action of the shuttle valve 7 allows the passage 9a to flow from the inlet port P through the shuttle valve 7.
Alternatively, pressure gas is supplied to 9b, but this is to replenish gas leakage from the pilot check valve and maintain self-retention for a long time. As another embodiment for achieving this purpose, the communication holes 71 and 72 in FIG. 3 are closed with blind plugs or the like to stop the function of the shuttle valve 7, and
The blind plugs 59 and 69 shown in FIGS. Alternatively, when the valve 63c closes the valve seat 51a or 61a, the small diameter portion 53d or 63d is removed from the valve seat 55a or 65a, and pressurized gas is replenished from the supply hole 55 or 65 to maintain the switching position for a long time. It is also possible to hold it. Alternatively, the shuttle valve 7 can be left as is, and when the solenoid 32 or 42 is demagnetized, the supply holes 55, 65 can be connected to the supply passages 38, 48.
It may also be communicated with.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view taken along A-A in Fig. 1, Fig. 3 is a sectional view taken along E-A in Fig. 1, and Figs. It is an explanatory diagram of the operation of the same embodiment. 1...First main valve part, 2...Second main valve part, 3
...first electromagnetic actuating part, 4... second electromagnetic actuating part, 5... first pilot check valve, 6...
Second pilot check valve, 11, 21... poppet valve, 12, 22... pilot section, 32,
42...Solenoid, 35a, 45a...Exhaust passage, 36a, 46a...Pilot passage.

Claims (1)

[Scope of utility model registration request] First and second main valve sections each have a poppet valve that is connected to a pressure gas source and switches the supply/discharge path depending on the pressure of the pilot section; The first and second electromagnetic actuators which open the pilot passage and close the exhaust passage by excitation, and the pilot part direction between the first electromagnetic actuator and one of the pilot parts of the first and second main valve parts. a first pilot check valve which is provided with the flow in the forward direction and allows flow in the reverse direction by the pressure of the other pilot part of the first and second main valve parts; the second electromagnetic actuating part; Second
A second main valve section is provided between the main valve section and the other pilot section with the pilot section direction being the forward direction, and allows flow in the opposite direction by the pressure of one of the pilot sections of the first and second main valve sections. A solenoid valve equipped with a pilot check valve.