JPH0430474Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a diaphragm type pilot type two-port valve.

[Prior Art] Pilot-type two-port valves are broadly classified into piston type valves that open and close the main valve with a piston, and diaphragm type valves that open and close the main valve with a diaphragm.

The above-mentioned piston type has the advantage of high heat resistance and pressure resistance, but because it has a sliding part, it has low resistance to foreign substances in the fluid, and is large in shape.
Another disadvantage is that the moving parts are heavy.
On the other hand, the diaphragm type, contrary to the piston type, has the disadvantages of being highly resistant to foreign substances in the fluid, having a small weight of moving parts, and being able to be made smaller than the piston type with the same capacity. It has the disadvantage of low pressure resistance.

Therefore, if the diaphragm type valve has high heat resistance and pressure resistance, a more excellent pilot type two-port valve can be obtained, but the diaphragm made of rubber reinforced with base fabric lacks heat resistance.
A diaphragm made of a thin resin film has relatively heat resistance, but has a problem of being weak in tensile strength and repeated bending fatigue, and having a short lifespan.

A conventional diaphragm type pilot type two-port valve, as shown in Fig. 4, consists of a main valve 1 and a pilot solenoid valve 2 that opens and closes the flow path of the main valve.
The valve body 4 of the main valve 1 includes an inlet port 5, an outlet port 6, and a main valve seat 7 between the channels that communicate the ports 5 and 6, and a valve body 8 that opens and closes the main valve seat 7.
is configured as a diaphragm type having a diaphragm 10, and a pressure action chamber 11 is formed behind a valve body 8 partitioned by the diaphragm 10.

The diaphragm 10 has a diaphragm receiver 12 on the pressure action chamber 11 side and a valve member 1 on the main valve material 7 side.
4 is brought into contact with the valve member holding plate 15 holding the valve body 4, and these are integrated by the shaft 16 to constitute the above-mentioned valve body 8. The valve body 8 is placed between the valve body 8 and the bonnet 9. A spring 17 that presses against the main valve seat 7 is provided.

In the conventional diaphragm type pilot type two-port solenoid valve described above, the pilot valve body 22 opens and closes the outlet orifice 21 by energizing or de-energizing the solenoid part of the pilot solenoid valve 2, and pressure is applied from the inlet port 5 through the inlet orifice 23. The pilot fluid pressure supplied to the chamber 11 causes the valve body 8 to move toward the main valve seat 7.
It opens and closes.

In the conventional diaphragm pilot type two-port solenoid valve described above, the diaphragm receiver 12 that supports the diaphragm 10 is formed of a single member, so the periphery of the diaphragm 10 with respect to the stroke A of the valve body 8 (see FIG. 5) Displacement angle F (6th
(see figure) becomes larger, and the diaphragm 10 bends greatly at the part A between the bonnet 9 and the diaphragm receiver 12, and a large stress is generated in this bent part.

Therefore, there is a problem in that the diaphragm 10 cannot be made of a material that has relatively heat resistance but is weak in tensile strength and repeated bending fatigue.

[Problem to be solved by the invention] The problem to be solved by the invention is to disperse the bent portions of the diaphragm and reduce local stress at the bent portions. Materials that are resistant to repeated bending fatigue can be used. An object of the present invention is to provide a more excellent pilot type two-port valve.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a pressure acting chamber by a diaphragm behind a diaphragm valve element that opens and closes a main valve seat between an inlet port and an outlet port in a main valve. A diaphragm-type pilot type valve, in which the pilot fluid flowing into the pressure acting chamber from the inlet orifice is allowed to flow through the outlet orifice, which is opened and closed by a pilot valve, and the main valve seat is opened and closed by the fluid pressure in the pressure acting chamber. In the two-port valve, the diaphragm receiver provided on the pressure action chamber side of the diaphragm is composed of a plurality of diaphragm receivers arranged concentrically and movable relative to each other in the stroke direction of the valve body. The diaphragm is characterized in that the stroke is made smaller as the diaphragm is located further outward in the radial direction, thereby dispersing the bent portions of the diaphragm.

[Operation] When the pilot valve closes the outlet orifice, the diaphragm valve element closes the main valve seat due to the fluid pressure of the pilot fluid supplied from the inlet orifice to the pressure action chamber.

When the pilot valve opens the outlet orifice,
Since the pilot fluid in the pressure application chamber is discharged from the outlet orifice, the diaphragm valve element opens the main valve seat due to the fluid pressure on the inlet port side.

In this case, by making the strokes of the plurality of diaphragm receivers arranged concentrically smaller as the diaphragm receivers are located further outward in the radial direction, the bending portions of the diaphragm are dispersed, so even if the stroke of the diaphragm is large, the bending portions are smaller. can reduce local stress in the area.

Therefore, a material that has heat resistance but is weak in tensile strength and repeated bending fatigue can be used for the diaphragm.

[Example] Figures 1 to 3 show examples of the present invention,
This diaphragm type pilot type 2 port valve is
Main valve 31 and pilot valve 3 that opens and closes the flow path of the main valve
It consists of 2.

The valve body 34 of the main valve 31 includes an inlet port 35, an outlet port 36, and a main valve seat 37 between the flow paths that communicate the ports 35 and 36, and a valve body 38 that opens and closes the main valve material 37 It has a diaphragm shape in which the periphery is sandwiched between the main body 34 and a bonnet 39 that covers it, and a pressure acting chamber 41 is formed in the bonnet 39 behind the valve body 38 that is partitioned by the diaphragm 40. There is.

The diaphragm 40 has diaphragm receivers 42 and 43 divided concentrically on the pressure action chamber 41 side.
A valve member holding plate 45 holding a valve member 44 is provided on the main valve seat 37 side, and these are integrated by a shaft 46 to constitute the above-mentioned valve body 38.
The main valve seat 37 is always biased in the direction of closing by a spring 47 compressed in the bonnet 39, and the shaft 46 has a breathing passage communicating between the pressure chamber 41 and the space on the tip end side of the shaft. 48 have been established. The diaphragm 40 is made of a resin thin film, such as tetrafluoroethylene resin (PTFE), which has relatively heat resistance but is weak in tensile strength and repeated bending fatigue, and has low pressure resistance and durability. There is.

The diaphragm receiver 43 has a thickness substantially equal to the thickness of the outer peripheral portion of the diaphragm receiver 42,
It is loosely fitted onto the outer periphery of the diaphragm receiver 42 so as to be slidable in the stroke direction of the valve body 38, and the bonnet is closed by engagement of engaging portions 42a and 43a formed in the sliding portions of the diaphragm receivers 42 and 43. When the sliding toward the side is restricted and the engaging portions 42a and 43a are in the engaged state, the diaphragm receiver 43 and the pressure chamber 4
The stroke C between the diaphragm receiver 42 and the back wall 41a is smaller than the stroke B between the diaphragm receiver 42 and the back wall 41a (see FIG. 2).

Although not shown, the diaphragm receiver can be divided into three or more parts. In this case, the stroke of the diaphragm receiver located radially outward is shorter than the stroke of the inner diaphragm receiver. Make it gradually smaller.

An outlet orifice 51 is provided in the passage 50 communicating the pressure action chamber 41 and the outlet port 36, and the outlet orifice 51 can be opened and closed by the pilot valve body 52 of the pilot valve 32 described above. The inlet port 35 and the pressure chamber side of the outlet orifice in the passage 50 communicate with each other through an inlet orifice 53 having an opening area smaller than that of the outlet orifice 51 .

In the pilot valve 32, the movable core is attracted to the fixed core by excitation of the electromagnetic section, the pilot valve body 52 at the tip of the movable core opens the outlet orifice 51, and the movable core returns by de-energizing the electromagnetic section. The pilot valve body 52 is a well-known solenoid valve that closes the outlet orifice 51. However, the pilot valve 32 is not limited to electromagnetic operation, but can also be operated by other operating forces such as fluid pressure.

Next, the operation of the above embodiment will be described with reference to FIGS. 2 and 3.

FIG. 1 shows a state in which the electromagnetic part of the pilot valve 32 is de-energized, the outlet orifice 51 is closed by the pilot valve body 52, and the pressure acting chamber 41 is closed.
Since pilot fluid is supplied from the inlet port 35 through the inlet orifice 53 and the passage 50, the valve element 38 closes the main valve seat 37 due to this fluid pressure and the biasing force of the spring 47. . In this case, the engaging portions 42a and 43a engage with each other due to the difference in fluid pressure acting on both the front and back surfaces of the diaphragm receiver 43, so that the diaphragm receiver 43 and the back wall 41
The distance C between a is the distance between the diaphragm receiver 42 and the back wall 4.
1a (see FIG. 2).

When the electromagnetic part of the pilot valve 32 is energized, the pilot valve body 52 opens the outlet orifice 51,
Since the pilot fluid in the pressure application chamber 41 flows out through the outlet orifice 51 to the outlet port 36,
The fluid pressure in the pressure action chamber 41 decreases, and the valve body 38 slides to a position where the diaphragm receivers 42 and 43 abut against the back wall 41a of the pressure action chamber 41 due to the fluid pressure from the inlet port 35. Main valve seat 37
is opened, and the diaphragm receiver 43 slides toward the main valve seat by B-C with respect to the diaphragm receiver 42 due to the stroke difference between the diaphragm receivers 42 and 43.

Therefore, the displacement angle E of the diaphragm 40 becomes smaller and its bent portions are dispersed at multiple locations, so that the local stress at the bent portions of the diaphragm 40 is reduced and the tensile force and bending acting on the diaphragm 40 are reduced. The force decreases (see Figure 3).

When the electromagnetic part of the pilot valve 32 is de-energized, the pilot valve 52 closes the outlet orifice 51, so the fluid pressure in the pressure action chamber 41 increases due to the pilot fluid flowing in from the inlet orifice 53, and the valve body 38 The state returns to the state shown in FIGS. 1 and 2.

[Effect of the invention] The present invention provides a diaphragm type pilot type two-port port valve in which a plurality of diaphragm receivers provided on the pressure action chamber side of the diaphragm are arranged concentrically and move relative to each other in the stroke direction of the valve body. By making the stroke of each diaphragm receiver smaller as the diaphragm receiver is located further outward in the radial direction, the bending portion of the diaphragm is dispersed and local stress at the bending portion is reduced. It is possible to use a material that has heat resistance but has low tensile strength and repeated bending fatigue and has a short life, and it is possible to obtain a superior pilot type two-port valve that also has the advantages of a piston type.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an embodiment of the present invention, Figs. 2 and 3 are enlarged sectional views of the same essential parts, and Fig. 4 is a longitudinal sectional front view of a conventional diaphragm type pilot type two-port solenoid valve. 5 and 6 are enlarged sectional views of the main parts of the same. 31...Main valve, 32...Pilot valve, 35...
...Inlet port, 36...Outlet port, 37...Main valve seat, 38...Valve body, 40...Diaphragm, 4
1...Pressure action chamber, 42, 43...Diaphragm receiver, 51...Outlet orifice, 53...Inlet orifice.

Claims (1)

[Claims for Utility Model Registration] Behind the diaphragm valve element that opens and closes the main valve seat between the inlet port and outlet port of the main valve, a pressure acting chamber is defined by a diaphragm, and the pressure acting chamber has an inlet orifice. A diaphragm type pilot type two-port valve that allows pilot fluid flowing in from the valve to flow out through an outlet orifice opened and closed by a pilot valve, and opens and closes a main valve seat using fluid pressure in the pressure action chamber, the pressure action chamber side of the diaphragm The diaphragm receiver provided in the diaphragm receiver is composed of a plurality of diaphragm receivers arranged concentrically and movable relative to each other in the stroke direction of the valve body. A diaphragm type pilot type 2 characterized in that the bent portions of the diaphragm are dispersed.
Port valve.