JP4822180B2 - Pressure amplification three-way valve - Google Patents

Description

The present invention relates to a pressure amplifying three-way valve that operates on and off.

In general, when a micro-pressure fluid output from a detector or the like that operates on / off is pressure-amplified by a pressure amplification valve to become a high-pressure fluid output, a small device that does not consume much fluid can be operated in the subsequent control. When a large amount of flow is consumed, a flow rate amplification valve (so-called master valve) corresponding to the flow rate is operated by the output of the pressure amplification valve.

That is, the pressure amplifying valve has a pressure amplifying part and a flow amplifying part for ensuring a constant output flow rate. This can be regarded as a pilot valve having a pressure amplifier. As the amplification principle of this pressure amplification valve, a diaphragm or the like as an operating body receives a small pressure signal input and directly switches the valve of the flow rate amplification unit by the force generated at that time (for example, see Non-Patent Document 1) ) And the indirect operation type (for example, refer to Patent Document 1) in which the nozzle flapper is operated and the valve of the flow rate amplifying unit is switched by the nozzle back pressure.

Hereinafter, the conventional direct operation type will be described with reference to FIG. 5, and the conventional indirect operation type will be described with reference to FIG.

FIG. 5 of the former is a state diagram in which a high pressure fluid is supplied to the supply port 49 in a poppet type normally open type, and a fine pressure signal input is turned off. The operating body 41 and the valve 44 of the flow rate amplifying unit are integrated with each other through a valve shaft 42. The urging force of the return spring 46 and the force of the high pressure fluid acting on the valve 44 and the valve shaft 42 act on the valve 44, the discharge valve seat 47 is closed, the supply port valve seat 50 is opened, and the high pressure fluid is applied to the output port 45. Is output.

When the fine pressure signal input to the input port 40 is turned on, the valve 44 is lowered by the force generated by the operating body 41, so that the open supply valve seat 50 is closed and the closed discharge valve seat 47 is opened. Thus, the fluid on the output side is discharged from the discharge port 48 and the output is turned off. Therefore, there is an advantage that high-pressure fluid is not consumed except when the valve 44 is switched. However, in order to switch the valve 44 when the fine pressure signal input is on, the force acting upward in the figure in the above-mentioned off state (the urging force of the return spring, the force due to the fluid pressure on the valve and the valve shaft) and the seal 43 It is necessary to overcome the generated sliding resistance, and the operating body that is the pressure amplifying unit becomes large.

FIG. 6 of the latter is a state diagram in which the fine pressure signal input is OFF in the poppet type normally closed type. A plunger 62 as a flapper integrated with the operating body 61 opens the nozzle 63. On the other hand, the high-pressure fluid supplied from the supply port 71 is partly branched to the valve 72 of the flow rate amplifying unit and reaches the nozzle 63 through the oblong hole of the valve shaft 70, the throttle 64, and the nozzle back pressure chamber 65. As a result, when the nozzle 63 is open, the fluid pressure in the nozzle back pressure chamber 65 is lowered, and the fluid is discharged to the low pressure side outside. Accordingly, no downward operating force is generated in the diaphragm 66 in the figure. On the other hand, the valve 72 integrated with the perforated support membrane 73 is configured so that the biasing force of the return spring 74 and the force of the high-pressure fluid acting on the valve 72 and the valve shaft 70 act upward in the figure. The valve 67 opens the valve seat of the valve 67. As a result, the output port 68 and the discharge port 69 communicate with each other and the output is off.

When the fine pressure signal input to the input port 60 is turned on, the force generated by the operating body 61 displaces the plunger 62 as a flapper and closes the nozzle 63. As a result, the pressure in the nozzle back pressure chamber 65 rises, the diaphragm 66 of the flow rate amplifying unit is actuated downward, the valves 67 and 72 are switched, and high pressure fluid is output to the output port 68. Therefore, the operating body 61 that is a pressure amplifying unit requires an operating force to close the nozzle 63. That is, the diameter of the nozzle 63 is an element that determines the size of the working body.

In general, since the nozzle diameter of the nozzle flapper can be less than 1 mm, the operating body of the pressure amplifying unit can be easily downsized compared to the direct operating type. However, since the indirect operation type is a nozzle flapper with the amplification principle, when the fine pressure signal input is off level, that is, while waiting for the fine pressure signal input to be on level, a small amount of high pressure fluid is always supplied. In the state of running down, it is a waste of energy.
Nikkan Kogyo Shimbun: Hydraulic / pneumatic design September 1976, pages 46-47 3 ・ 3 ・ 1 Interface valve (pressure amplification) Japanese Patent Application Publication No. 46-33062

As described above, the conventional direct-acting type pressure amplifying valve is limited in size reduction, and the conventional indirect-acting type pressure amplifying valve is wasteful of energy when the fine pressure signal input is at the off level. The present invention has been made in view of the above points, and provides a pressure amplification three-way valve that has a simple structure and does not consume a supply fluid except when the pressure amplification valve is switched, and can be easily downsized.

The pressure amplification three-way valve provided by the present invention is as described in the following (1) and (2).

(1) by a change in positional relationship by a pair of magnets, magnetic forces repelling direction by utilizing the fact that is 180 degrees opposite, the fine pressure signal input receiving the actuable operating member to the other side to one side, the non-magnetic A normally closed type pressure amplifying three-way valve which operates an inner poppet type valve through a partition wall.
(Hereinafter referred to as the first invention)

(2) When a small pressure signal input is received on one side, the actuating body that can be actuated to the other side and the actuating body and an inner poppet shaped valve via a nonmagnetic partition wall are coupled by a suction force by a pair of magnets. A normally closed pressure amplifying three-way valve characterized by (Hereinafter referred to as the second invention)

By transmitting the force of the operating body by magnetic force, it is possible to switch the valve via the partition wall. Therefore, the valve shaft and shaft seal as a transmission shaft in the direct-acting type pressure amplifying valve are not required, and the factors that determine the size of the operating body are the biasing force of the return spring that returns the operating body and the valve receives the fluid pressure. It becomes two points of valve seat caliber. In order to secure the flow rate equivalent to that of the pilot valve, the valve seat diameter does not need to be increased so that the supply fluid is not consumed except when the pressure amplifying valve is switched. Amplification three-way valve is possible.

When the repulsive force inherent to the magnet is used for transmission by magnetic force, the valve operation is normally closed, and when the attractive force is used, the valve operation is normally open.

An embodiment of the first invention will be described with reference to Example 1.

The first embodiment relates to a normally closed type pressure amplifying three-way valve, which will be described with reference to FIG. 1. A diaphragm 2 for receiving a fine pressure signal is provided in a lower portion of a cylindrical base 1 made of a non-magnetic material. . The diaphragm 2 is integrated with a retainer 4a in which a ring-shaped magnet 3 is fixed to the upper portion and a ventilation hole 22 is provided. This ring-shaped magnet 3 has magnetic poles S and N in the vertical direction.

The room 20 and the room 21 are partitioned by the diaphragm 2, and the base 1 is provided with an input port 11 leading to the room 20 and a discharge port 15 leading to the room 21. A return spring 19 is provided near the outer periphery of the retainer 4a. The return spring 19 urges and seats the retainer 4a on the base 1 when the fine pressure signal input is off.

A cylindrical valve holder 5 made of a non-magnetic material is provided on the upper portion of the base 1. At the center position in the vertical direction of the valve holder 5, a valve seat 9 and a supply port 12 are provided on the upper side, and a valve seat 10 and a discharge port 14 are provided on the lower side. Further, an output port 13 reaching the space of the valve holder 5 is provided in the upper part of the base body 1. Except for the supply port 12, the output port 13, and the discharge port 14, the inner space of the valve holder 5 is structured to be airtight.

Inside the valve holder 5, there is provided a valve 6 in which a packing 8 and a bar magnet 7 are fixed to a non-magnetic bar member. The bar magnet 7 has magnetic poles S and N in the vertical direction. It should be noted that the vertical positional relationship between the ring-shaped magnet 3 and the bar magnet 7 is such that the repulsive force urges the valve 6 toward the valve seat 9 at the initial stroke position of the diaphragm 2, and the magnetic poles are in contact with each other when the stroke exceeds a certain value. The repulsion direction becomes opposite to the position change of the valve 6 so that the valve 6 is urged toward the valve seat 10. This “operation stroke is a constant value” means that the vertical positions of the upper surfaces of the pair of magnets coincide with each other, and the repulsive force is “0”.

The dimension of the valve 6 is a value that can smoothly move up and down in the inner cylindrical space of the valve holder 5. In addition, a passage 18 that connects the upper space 16 and the lower space 17 is provided in a part of the outer periphery of the valve 6 in order to equalize the fluid pressure in the upper space 16 and the lower space 17 during the transition period when the valve 6 is switched.

Next, the operation of the first embodiment will be described.

FIG. 1 shows a state in which high pressure fluid is supplied to the supply port 12 and the fine pressure signal input is not in the input port 11, and the valve 6 rises due to the repulsive force of the bar magnet 7 and the ring magnet 3 and moves the valve seat 9 It is closed. Accordingly, the high-pressure fluid is blocked from the inside of the valve holder 5, and the fluid pressure at the output port 13 is externally passed through the upper space 16, the passage 18, the lower space 17, the discharge port 14, the vent hole 22, the chamber 21, and the discharge port 15. Since the communication is established, the output is off.

When the minute pressure signal input is turned on, when the ring magnet 3 is raised by the operating force generated by the diaphragm 2 and exceeds a certain value, the magnetic repulsion direction of the corresponding bar magnet 7 is opposite, and the valve 6 is moved downward. The valve seat 9 opens and the valve seat 10 closes. As a result, the high-pressure fluid flows through the output port 13 and the output is turned on. FIG. 2 shows the state at this time.

When the micro-pressure signal input is turned off below a certain value, when the diaphragm 2 is lowered by a biasing force of the return spring 19 and exceeds a certain value, the bar magnet 7 is built into the lowered ring magnet 3 instantaneously. The valve seat 10 that has been lifted and repelled in the opposite direction is opened, and the valve seat 9 is closed. Then, the retainer 4a sits on the base 1 and returns to FIG.

An embodiment of the second invention will be described with reference to Example 2.

The second embodiment relates to a normally open type pressure amplifying three-way valve using the attractive force of a magnet, and will be described with reference to FIG. The magnetic pole surface of the ring-shaped magnet 3 is set in the vertical directions N and S opposite to those in the first embodiment, and the components are the same except for the retainer 4a of the normally closed type pressure amplifying three-way valve shown in the first embodiment. Therefore, the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

Although the shape of the retainer 4b is different from the retainer 4a, this is because the positional relationship is such that an attractive force always acts on the ring-shaped magnet 3 and the bar magnet 7. As a result, at the initial stroke position of the diaphragm 2, the suction force urges the valve 6 to the valve seat 10, and at the start of the stroke, the valve 6 follows the ring-shaped magnet 3.After the stroke end of the valve 6, the diaphragm 2 The valve 6 is biased to the valve seat 9 until the end of the working stroke.

Next, the operation of the second embodiment will be described.

FIG. 3 shows a case where the input of the fine pressure signal is off and the input port 11 is off. In the valve 6, the valve seat 10 is closed and the valve seat 9 is opened by the attractive force of the bar magnet 7 and the ring magnet 3. The high-pressure fluid supplied to the supply port 12 passes through the inside of the communicating valve holder 5 and the output of the output port 13 is turned on.

When the minute pressure signal input is turned on, the ring-shaped magnet 3 is raised by the operating force generated by the diaphragm 2, and the valve 6 incorporating the bar magnet 7 follows the upper side by the attractive force. As a result, the valve seat 10 is opened and the valve seat 9 is closed. Accordingly, the high-pressure fluid at the supply port 12 is blocked from the inside of the valve holder 5, and the fluid pressure at the output port 13 is the upper space 16, the passage 18, the lower space 17, the discharge port 14, the vent hole 22, the chamber 21, and the discharge port 15. Since it communicates with the outside via, the output is turned off. FIG. 4 shows the state at this time.

When the input signal pressure is turned off below a certain value, the diaphragm 2 is lowered by the biasing force of the return spring 19, and the retainer 4b is seated on the base 1. The valve 6 incorporating the bar magnet 7 in the lowered ring-shaped magnet 3 follows by the attractive force, opens the closed valve seat 9 and descends, closes the valve seat 10 and returns to FIG.

FIG. 5 is a cross-sectional view when the fine pressure signal input is off in the first invention. (Example 1) FIG. 5 is a cross-sectional view when the fine pressure signal input is on in the first invention. (Example 1) FIG. 6 is a cross-sectional view when the fine pressure signal input is off in the second invention. (Example 2) FIG. 6 is a cross-sectional view when a fine pressure signal input is on in the second invention. (Example 2) It is a schematic sectional drawing of a normally open type with the conventional direct acting type pressure amplification three-way valve. The fine pressure signal input is in the off state. It is a general sectional view of a normally closed type in the conventional indirect operation type pressure amplification three-way valve. The fine pressure signal input is in the off state.

2 Diaphragm
3-ring magnet
4a retainer
4b retainer
6 valves
7 bar magnet
9 valve seat
10 valve seat

Claims (2)

A low pressure input port at the bottom of the non-magnetic substrate, a high pressure fluid supply port and output port at the top, and a discharge port at the middle,
A diaphragm integrated with a ring magnet via a retainer via a retainer and a return spring that urges the diaphragm to the lower part of the base with a constant force at the lower part in the base,
A supply port valve seat that is an inner poppet type three-way valve structure, a valve with a built-in bar magnet, and an exhaust port valve seat are arranged in a non-magnetic holder in the upper part of the base, and the ring magnet and bar magnet are By making the magnetic pole arrangement with repulsion, when the fine pressure input is off, the valve opens the exhaust valve seat and closes the high pressure fluid supply valve seat,
If the ring magnet exceeds a certain position due to the operating force of the diaphragm when the micro-pressure input is on, the repulsive direction of the magnetic force will be opposite due to the change in the positional relationship between the pair of magnets, and the valve will open the valve seat of the high-pressure fluid supply port. Open and close the exhaust valve seat,
When the micro pressure input is turned off, the diaphragm is lowered by the return spring, and when the ring-shaped magnet exceeds a certain position, the repulsion direction of the magnetic force becomes opposite due to the change in the positional relationship between the pair of magnets, and the valve moves the exhaust valve seat. A normally closed pressure amplifying three-way valve characterized in that the valve seat of the open high-pressure fluid supply port is closed and the retainer is seated on the base . A low pressure input port at the bottom of the non-magnetic substrate, a high pressure fluid supply port and output port at the top, and a discharge port at the middle,
A diaphragm integrated with a ring magnet via a retainer via a retainer and a return spring that urges the diaphragm to the lower part of the base with a constant force at the lower part in the base,
A supply port valve seat that is an inner poppet type three-way valve structure, a valve with a built-in bar magnet, and an exhaust port valve seat are arranged in a non-magnetic holder in the upper part of the base, and the ring magnet and bar magnet are By adopting a magnetic pole arrangement with suction, when the fine pressure input is off, the valve closes the exhaust valve seat and opens the high pressure fluid supply valve seat,
When the micro pressure input is turned on, the ring-shaped magnet is raised by the operating force of the diaphragm, and the sucked valve opens the exhaust valve seat and closes the high pressure fluid supply valve seat,
When the micro pressure input is turned off, the diaphragm is lowered by the return spring, the valve sucked by the ring magnet opens the valve seat of the high pressure fluid supply port, closes the exhaust port valve seat, and the retainer sits on the base A normally open pressure amplifying three-way valve.

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