JP7075373B2 - Pilot solenoid valve - Google Patents

Description

The present invention relates to a pilot solenoid valve that opens and closes the main valve in response to energization of the solenoid poppet valve.

For example, in a dehydrator, a water-cooled cooling device, a cleaning device, etc., a pilot solenoid valve is arranged in a pipe through which water flows, and ON-OFF control of water is performed. As the pilot solenoid valve, for example, the one shown in FIG. 4 is manufactured and sold.

In the conventional pilot solenoid valve 100 shown in FIG. 4, an electromagnetic poppet valve 20 is attached to a valve body 10, and a main valve 11 built in the valve body 10 opens and closes in response to energization of the electromagnetic poppet valve 20. Will be done.

In the valve body 10, the input port 101 and the output port 104 communicate with each other via the input flow path 102 and the valve hole 103. The input port 101 and the output port 104 are formed coaxially with the valve body 10. The valve hole 103 is formed in the valve body 10 along a direction orthogonal to the axis of the output port 104, and communicates with the output port 104. The main valve 11 includes a main valve seat 12 and a diaphragm valve body 13.

The main valve seat 12 is provided in the valve body 10 along the outer periphery of the opening of the valve hole 103. The diaphragm valve body 13 is provided so as to be in contact with or separable from the main valve seat 12, and airtightly separates the action chamber 105 and the back chamber 106. The valve spring 18 is contracted to the back chamber 106 and constantly urges the diaphragm valve body 13 toward the main valve seat 12. The back chamber 106 communicates with the input port 101 via the first bypass flow path 111 and the input flow path 102.

The valve body 10 has a poppet chamber 113 formed coaxially with the back chamber 106. The poppet chamber 113 has a smaller volume than the back chamber 106 and communicates with the back chamber 106 via a communication passage 112. The valve body 10 is formed with a through hole so as to communicate the poppet chamber 113 and the back chamber 106, and the first bypass flow path 111 and the communication passage 112 are partially overlapped by the through hole. Further, the poppet chamber 113 communicates with the valve hole 103 via the second bypass flow path 114. Therefore, the back chamber 106 communicates with the valve hole 103 via the communication passage 112, the poppet chamber 113, and the second bypass flow path 114.

In the poppet chamber 113, the pilot hole 1141 of the second bypass flow path 114 opens in the center of the bottom, and the poppet valve seat 21 is provided along the outer periphery of the opening. The electromagnetic poppet valve 20 is attached to the valve body 10 so that the poppet valve body 22 abuts or separates from the poppet valve seat 21. In the electromagnetic poppet valve 20, a coil is wound around the coil assembly 23. The coil assembly 23 is provided with a hollow portion, a core 24 is fixed to one end opening of the hollow portion, and a plunger 25 is loaded so as to be able to reciprocate linearly from the other end opening. The plunger spring 26 constantly urges the plunger 25 toward the poppet valve seat 21 side.

In such a pilot solenoid valve 100, when the coil of the coil assembly 23 is not energized, the main valve 11 is in a valve closed state. That is, in the electromagnetic poppet valve 20, the core 24 is not excited, and the plunger 25 is urged by the plunger spring 26 to bring the poppet valve body 22 into contact with the poppet valve seat 21. When water is supplied to the input port 101, the water flows into the back chamber 106 through the first bypass flow path 111, but is blocked by the electromagnetic poppet valve 20 and does not flow to the valve hole 103 side. Therefore, the force acting on the back chamber 106 side of the diaphragm valve body 13 becomes larger than the force acting on the output port 104 side, and the diaphragm valve body 13 comes into contact with the main valve seat 12.

When the coil of the coil assembly 23 is energized, the pilot solenoid valve 100 opens the main valve 11 and outputs water from the output port 104. That is, in the electromagnetic poppet valve 20, the core 24 is excited in response to the energization of the coil assembly 23. The core 24 sucks the plunger 25 against the plunger spring 26 and separates the poppet valve body 22 from the poppet valve seat 21. As a result, the internal force of the back chamber 106 is discharged to the output port 104 via the communication passage 112, the pilot hole 1141, and the second bypass flow path 114, so that the receiving pressure on the back chamber 106 side of the diaphragm valve body 13 decreases. Then, the receiving pressure on the working chamber 105 side is increased, and the diaphragm valve body 13 is separated from the main valve seat 12. That is, the main valve 11 changes from the valve closed state to the valve open state, and water is output from the output port 104.

In the pilot solenoid valve 100, when the energization of the coil of the coil assembly 23 is stopped, the poppet valve body 22 comes into contact with the poppet valve seat 21. The water supplied to the input port 101 flows into the back chamber 106 and raises the internal pressure of the back chamber 106. The diaphragm valve body 13 is displaced toward the main valve seat 12 as the internal pressure of the back chamber 106 increases, and abuts on the main valve seat 12. That is, the main valve 11 changes from the valve open state to the valve closed state, and water is not output from the output port 104.

However, the prior art has the following problems. That is, in the conventional pilot solenoid valve 100, when the valve is opened and closed to supply water, the piping may be shaken. Shaking of the pipe is not preferable because it may generate abnormal noise or, if the pipe is a vinyl chloride pipe, it may cause fatigue and fracture of the pipe.

Therefore, the inventor conducted a pressure fluctuation confirmation test when the valve was opened and closed. In the test, three types of test circuits were prepared. As shown in FIG. 5A, the first test circuit includes a first pressure transducer 201 from the upstream side, a pilot solenoid valve 100 shown in FIG. 4, and a second test circuit in a vertical pipe 301 arranged in the vertical direction. A pressure transducer 202 was arranged. In the first test circuit, as shown in L1 in the figure, the pipe 301a on the output side was set up about 1 m from the pilot solenoid valve 100. As shown in FIG. 5B, the second test circuit has a first pressure converter 201, a pilot solenoid valve 100, and a second pressure converter 202 from the upstream side in a vertical pipe 302 arranged in the vertical direction. Was arranged. In the second test circuit, as shown in the figure, the pipe 302a on the output side is hardly raised from the pilot solenoid valve 100. As shown in FIG. 5C, the third test circuit has a first pressure converter 201, a pilot solenoid valve 100, and a second pressure converter 202 from the upstream side in a horizontal pipe 303 arranged in the horizontal direction. Was arranged. As shown in L3 in the figure, the third test circuit is provided so that the pipe 303a on the output side is raised by about 1 m.

In the test, water whose pressure was adjusted to 0.25 MPa was supplied to each of the first to third test circuits with the output side pipes 301a, 302a, and 303a open. Then, the pressure waveform of the primary side pressure P1 of the pilot solenoid valve 100 is measured by using the first pressure converter 201 for each of the first to third test circuits, and the secondary pressure P2 of the pilot solenoid valve 100 is measured. The pressure waveform of was measured using the second pressure converter 202. In addition, it was visually confirmed whether or not the piping was shaken for each of the first to third test circuits.

FIG. 6 shows the pressure fluctuation confirmation test result of the first test circuit. As shown in FIG. 6A, the first test circuit is shown in D2 and D3 in the figure when the pilot solenoid valve 100 is applied with a voltage (see D1 in the figure) and starts to open the main valve 11. As described above, a large pressure fluctuation occurred in the primary side pressure P1 and the secondary side pressure P2. The pressure fluctuation lasted for about 1 second (see T1 in the figure). During the pressure fluctuation, the shaking of the vertical pipe 301 was visually confirmed.

Further, in the first test circuit, as shown in FIG. 6 (b), when the pilot solenoid valve 100 is stopped from applying the voltage (D11 in the figure) and starts to close the main valve 11, D12 in the figure. As shown in D13, a large pressure fluctuation occurred in the primary side pressure P1 and the secondary side pressure P2. The pressure fluctuation lasted for about 1 second (see T11 in the figure). During the pressure fluctuation, the shaking of the vertical pipe 301 was visually confirmed.

On the other hand, in the second test circuit and the third test circuit, almost no pressure fluctuation was confirmed when the pilot solenoid valve 100 was opened and closed. Further, the shaking of the vertical pipe 302 and the horizontal pipe 303 was not visually confirmed.

From the above, it was confirmed that the pilot solenoid valve 100 causes pressure fluctuation and pipe sway when the valve is opened and closed due to the mounting posture and the length of the pipe on the output side.

Next, the inventor manufactured the transparent valve body 10 and confirmed the internal state of the pilot solenoid valve 100 when the vertical pipe 301 was shaken. As a result, as shown in FIG. 7, it was confirmed that the air pool E was formed in the back chamber 106 to about half of the back chamber 106. The inventor thought that this air reservoir E would serve as a cushion, causing pressure fluctuations and swaying of the piping when the valve was opened and closed.

That is, as shown in FIG. 7, when water flows into the back chamber 106 from the input port 101 via the first bypass flow path 111, the air mixed in the water collects in the high portion of the back chamber 106. The communication passage 112 is located lower than the poppet valve seat 21. Therefore, the air in the back chamber 106 cannot escape to the poppet chamber 113 through the communication passage 112, and remains in the back chamber 106. Therefore, in the back chamber 106, the air pool E has grown to about half.

In the pilot solenoid valve 100, when the poppet valve body 22 is separated from the poppet valve seat 21 by applying a voltage, the diaphragm valve body 13 is separated from the main valve seat 12. However, the diaphragm valve body 13 separated from the main valve seat 12 is pushed back toward the main valve seat 12 by the repulsive force of the air pool E, and narrows the flow path area between the diaphragm valve body 13 and the main valve seat 12. .. As the flow path area becomes narrower, the flow velocity of water when it flows into the valve hole 103 increases. Therefore, the vicinity of the valve hole 103 is in a negative pressure state. Due to this negative pressure state, the diaphragm valve body 13 is sucked into the main valve seat 12 and comes into contact with the main valve seat 12. After that, the water flowing out from the output port 104 to the output side pipe 301a is pulled back to the negative pressure region, the internal pressure of the valve hole 103 is increased, and the diaphragm valve body 13 is separated from the main valve seat 12 again.

By repeating this series of operations, the pilot solenoid valve 100 causes chattering in which the diaphragm valve body 13 repeatedly abuts or separates from the main valve seat 12 at high speed when the valve starts to open. It is considered that this chattering causes water to be intermittently output from the output port 104, causing pressure fluctuations and shaking of the vertical pipe 301.

On the other hand, in the pilot solenoid valve 100, when the poppet valve body 22 comes into contact with the poppet valve seat 21 due to the stop of voltage application, the diaphragm valve body 13 is displaced toward the main valve seat 12 and the input port 101. The flow of water flowing from the output port 104 to the output port 104 is sharply reduced. However, the water on the output port 104 side flows downstream due to the inertial force. Therefore, the vicinity of the valve hole 103 is in a negative pressure state. Then, the water output to the pipe 301a on the output side is pulled back to the negative pressure region, that is, the valve hole 103, pressurizes the diaphragm valve body 13 in the direction away from the main valve seat 12, and separates from the main valve seat 12. Let me. At this time, the diaphragm valve body 13 is pushed back toward the main valve seat 12 by the repulsive force of the air pool E and comes into contact with the main valve seat 12.

By repeating this series of operations, the pilot solenoid valve 100 causes chattering when the valve starts to close. It is considered that this chattering causes water to be intermittently output from the output port 104, causing pressure fluctuations and shaking of the vertical pipe 301.

The reason why pressure fluctuation and pipe sway were not confirmed in the pilot solenoid valve 100 installed in the horizontal pipe 303 is that air collects in the portion where the communication passage 112 of the back chamber 106 opens, and the poppet valve body 22 is formed. It is considered that the air accumulated in the back chamber 106 when separated from the poppet valve seat 21 easily escapes from the communication passage 112 to the valve hole 103 via the poppet chamber 113 and the second bypass flow path 114. That is, if the air pool E accumulates in about 10 to 20% of the back chamber 106, it has almost no effect on the displacement of the diaphragm valve body 13, and the horizontal pipe 303 has the air pool E growing only to that extent. it is conceivable that.

Further, the reason why the pressure fluctuation and the shaking of the pipe were not confirmed in the pilot solenoid valve 100 installed in the vertical pipe 302 is output from the output port 104 because the pipe 302a on the output side does not rise in the vertical direction. It is considered that the amount of the accumulated water returning to the valve hole 103 side is small.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pilot solenoid valve capable of suppressing chattering generated when the valve is opened and closed.

One aspect of the present invention has the following configuration. That is, (1) a main valve that controls the fluid flowing from the input port to the output port by abutting or separating the diaphragm valve body from the main valve seat provided between the input port and the output port. The pressure in the back chamber of the diaphragm valve body by abutting or separating the poppet valve body from the poppet valve seat and the valve body having the main valve built-in and the poppet valve body attached to the valve body according to the energization of the coil. A first bypass flow path in which the valve body communicates the input port and the back chamber, a poppet chamber provided with the poppet valve seat, the poppet chamber and the said. In a pilot-type electromagnetic valve formed with a communication passage that communicates with the back chamber and a second bypass flow path that communicates the poppet chamber and the output port, the valve body is the poppet chamber and the back. It has a through hole that communicates with the chamber, and the through hole is orthogonal to the axis passing through the center of the poppet valve seat and the center of the communication passage, and from the center line passing through the center of the poppet valve seat. It is characterized in that it is provided at a position opposite to the communication passage.

For example, even when the pilot solenoid valve having the above configuration is attached to the pipe in a posture in which the communication passage is arranged below the poppet valve seat, the electromagnetic poppet valve is energized to separate the poppet valve body from the poppet valve seat. When it is made to do so, the air accumulated in the back chamber escapes to the poppet chamber through the through hole. Therefore, the residual amount of air remaining in the back chamber is suppressed, and the diaphragm valve body is smoothly displaced according to the pressure difference between the back chamber side and the output port side. Therefore, according to the pilot solenoid valve having the above configuration, chattering that occurs when the valve is opened and closed can be suppressed.

(2) In the configuration according to (1), the first bypass flow path, the communication passage, the poppet valve seat, and the second bypass flow path are formed coaxially, and the communication passage is the poppet valve seat. It is preferable that the through hole is provided on the side of the first bypass flow path and the through hole is provided on the side of the second bypass flow path from the center line.

According to the pilot solenoid valve having the above configuration, chattering that occurs when the valve is opened and closed can be prevented by a simple flow path configuration.

(3) In the pilot solenoid valve according to (1) or (2), the opening area where the through hole opens in the poppet chamber is smaller than the opening area of the poppet valve seat, and the communication passage opens in the poppet chamber. The opening area to be formed is preferably larger than the opening area of the poppet valve seat.

The pilot solenoid valve having the above configuration utilizes the force of the fluid flowing from the communication passage to the second bypass flow path through the poppet chamber to remove the air accumulated in the back chamber to the poppet chamber through the through hole. Air bleeding can be promoted, and chattering that occurs when the valve is opened and closed can be efficiently suppressed.

Therefore, according to the present invention, it is possible to provide a pilot solenoid valve capable of suppressing chattering that occurs when the valve is opened and closed.

It is sectional drawing of the pilot type solenoid valve which concerns on embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a figure explaining the flow of air. It is sectional drawing of the conventional pilot type solenoid valve. It is a figure which shows the test circuit. It is a figure which shows the pressure fluctuation confirmation test result of the pilot type solenoid valve shown in FIG. It is a figure explaining the cause of chattering.

Hereinafter, embodiments of the pilot solenoid valve according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a pilot solenoid valve 1 according to an embodiment of the present invention. The pilot solenoid valve 1 of the present embodiment is provided with a through hole 2 for bleeding air from the conventional pilot solenoid valve 100 shown in FIG.

The valve body 10 of the pilot solenoid valve 1 is configured by screwing the main body 3, the valve body 4, the stuffing 5, and the holding plate 6. The through hole 2 is provided in the stuffing 5 forming the poppet chamber 113 and the back chamber 106. In this embodiment, the main body 3 is made of a highly rigid material such as metal, and the valve body 4, the stuffing 5, and the holding plate 6 are made of a non-magnetic material such as resin.

The main body 3 may be formed of a material other than metal such as resin. The main body 3 and the valve body 4 may be integrally formed. In this embodiment, the stuffing 5 is composed of three parts, a first member 51, a second member 52, and a third member 53, but may be composed of one part, or may be composed of two parts or four or more parts. You may.

In the valve body 10, the input port 101, the input flow path 102, the valve hole 103, and the output port 104 are formed on the same cross section. That is, the input port 101 and the output port 104 are coaxially provided on the opposite end faces of the main body 3. The valve hole 103 is formed in the main body 3 along a direction orthogonal to the axis of the output port 104, and communicates with the output port 104. The input flow path 102 is formed in the main body 3 at a position outside the radial direction of the valve hole 103 so as to communicate with the input port 101.

The main valve seat 12 is integrally molded with the valve body 4 so as to be provided along the outer periphery of the opening of the valve hole 103. The diaphragm valve body 13 is made of elastic rubber. The diaphragm valve body 13 has a space portion formed between the valve body 4 and the stuffing 5 by sandwiching the outer edge portion between the valve body 4 and the stuffing 5, and the working chamber 105 and the back chamber 106. It is airtightly partitioned.

The diaphragm valve body 13 is sandwiched between the first pressure receiving body 14 and the second pressure receiving body 15 via the guide rod 16, and constitutes the diaphragm assembly 17. In the stuffing 5, a spring receiving portion 531 that supports the valve spring 18 with the first pressure receiving body 14 is provided on the third member 53. The guide hole 532 is formed in the spring receiving portion 531 along the axial direction of the back chamber 106, and the guide rod 16 is slidably fitted.

The first pressure receiving body 14 is formed by molding metal into a cylindrical cup shape. The second pressure receiving body 15 is formed by molding metal into a disk shape. The outer diameter of the first pressure receiving body 14 is larger than the outer diameter of the main valve seat 12, and the outer diameter of the second pressure receiving body 15 is smaller than the outer diameter of the main valve seat 12. Therefore, in the diaphragm assembly 17, with the guide rod 16 guided by the guide hole 532, along the axial direction of the back chamber 106 according to the balance of the forces acting on the first pressure receiving body 14 and the second pressure receiving body 15. It is displaced and the diaphragm valve body 13 can be pressed against the main valve seat 12 with a uniform force in the circumferential direction.

The first bypass flow path 111, the communication passage 112, the poppet chamber 113, and the second bypass flow path 114 of the valve body 10 are formed so as to appear on the same cross section as the input port 101 and the output port 104. .. The poppet chamber 113 is provided coaxially with the back chamber 106, and the pilot hole 1141 of the second bypass flow path 114 is opened in the central portion of the bottom. The poppet valve seat 21 is provided along the outer periphery of the opening of the pilot hole 1141.

That is, as shown in FIG. 2, the first bypass flow path 111, the communication passage 112, the poppet chamber 113, the second bypass flow path 114, and the poppet valve seat 21 are formed coaxially. The communication passage 112 is provided on the first bypass flow path 111 side from the center line X2 passing through the center of the poppet valve seat 21 and orthogonal to the axis line X1 passing through the center of the poppet valve seat 21 and the center of the communication passage 112. Has been done. The through hole 2 is provided on the second bypass flow path 114 side from the center line X2. That is, the valve main body 10 is provided with a through hole 2 at a position opposite to the communication passage 112 with respect to the center line X2.

The flow path inner diameter Y2 of the communication passage 112 is larger than the opening inner diameter Y1 of the poppet valve seat 21, and the flow path inner diameter Y3 of the through hole 2 is smaller than the opening inner diameter Y1 of the poppet valve seat 21. That is, the opening area where the through hole 2 opens to the poppet chamber 113 is smaller than the opening area of the poppet valve seat 21. The opening area of the communication passage 112 opening to the poppet chamber 113 is larger than the opening area of the poppet valve seat 21.

When the pilot solenoid valve 1 is attached to a vertical pipe, as shown in FIG. 3, the pilot solenoid valve 1 is in a posture in which the input port 101 is on the lower side and the output port 104 is on the upper side. In this case, in the pilot solenoid valve 1, similarly to the conventional pilot solenoid valve 100, the air mixed in the water supplied to the input port 101 collects in the back chamber 106 to form the air pool E.

Then, the pilot solenoid valve 1 energizes the coil assembly 23, and when the poppet valve body 22 separates from the poppet valve seat 21, the poppet chamber 113 passes through the pilot hole 1141, the second bypass flow path 114, and the valve hole 103. Water begins to flow to the output port 104. The second member 52 is arranged on the first bypass flow path 111, and the flow path cross-sectional area of the first bypass flow path 111 is smaller than the flow path cross-sectional area of the pilot hole 1141. Therefore, when the electromagnetic poppet valve 20 opens, as shown in Z11, Z12, Z2 to Z6 in the figure, the water in the back chamber 106 flows into the communication passage 112, the poppet chamber 113, the pilot hole 1141, and the second bypass flow path 114. It flows out to the output port 104 via. That is, the internal force of the back chamber 106 is discharged to the output port 104 via the communication passage 112, the poppet chamber 113, the pilot hole 1141, and the second bypass flow path 114. As a result, the receiving pressure on the back chamber 106 side of the diaphragm valve body 13 decreases, the receiving pressure on the working chamber 105 side becomes higher, and the diaphragm valve body 13 separates from the main valve seat 12.

In this case, in the pilot solenoid valve 1 of the present embodiment, when the air reservoir E is pressurized according to the displacement of the diaphragm valve body 13, the air in the back chamber 106 is passed through the through hole 2 as shown in Z1 in the drawing. Exit to the poppet room 113 via. Therefore, the pilot solenoid valve 1 has a smaller air pool E formed in the back chamber 106 than the conventional pilot solenoid valve 100 shown in FIG. That is, in the pilot solenoid valve 1, the force with which the air pool E pushes back the diaphragm valve body 13 when the diaphragm valve body 13 is separated from the main valve seat 12 is smaller than that of the pilot solenoid valve 100.

The air that has escaped to the poppet chamber 113 flows into the pilot hole 1141 together with the water that has flowed into the poppet chamber 113 from the communication passage 112 as shown in Z2 in the figure, and is the second as shown in Z3 to Z6 in the figure. It is discharged to the outside of the pilot solenoid valve 1 through the bypass flow path 114, the valve hole 103, and the output port 104.

The flow path inner diameter Y2 of the communication passage 112 is larger than the opening inner diameter Y1 of the poppet valve seat 21. That is, the opening area of the communication passage 112 opening to the poppet chamber 113 is larger than the opening area of the poppet valve seat 21. Therefore, the water is accelerated when flowing into the pilot hole 1141 and vigorously flows to the valve hole 103 through the second bypass flow path 114. On the other hand, the through hole 2 is smaller than the opening inner diameter Y1 of the poppet valve seat 21. That is, the flow path inner diameter Y3 of the through hole 2 is smaller than the flow path inner diameter Y2 of the communication passage 112. That is, the opening area of the through hole 2 opening into the poppet chamber 113 is smaller than the opening area of the communication passage 112 and the opening area of the poppet valve seat 21. Therefore, the air that has escaped from the back chamber 106 to the poppet chamber 113 through the through hole 2 flows into the pilot hole 1141 by the force of the water flowing from the poppet chamber 113 into the pilot hole 1141. This promotes air bleeding from the back chamber 106 to the poppet chamber 113 through the through hole 2. That is, the growth of the air pool E is suppressed as compared with the conventional pilot solenoid valve 100 shown in FIG.

Therefore, even if the pilot solenoid valve 1 is attached to the pipe in a posture in which the communication passage 112 is below the poppet valve seat 21 and the diaphragm valve body 13 is displaced in the horizontal direction, the diaphragm is mounted when a voltage is applied. The valve body 13 is smoothly displaced in the direction opposite to the main valve seat 12 according to the decrease in the internal pressure of the back chamber 106, and water can be supplied from the input port 101 to the output port 104. That is, the pilot solenoid valve 1 does not cause chattering when the main valve 11 starts to open, and can output water from the output port 104 at a stable flow rate. Therefore, the pilot solenoid valve 1 can suppress pressure fluctuations when starting to supply water and prevent the piping from shaking.

In the pilot solenoid valve 1, when the energization of the coil assembly 23 is stopped, the poppet valve body 22 comes into contact with the poppet valve seat 21, and water flows from the input port 101 to the back chamber 106 via the first bypass flow path 111. Be supplied. The diaphragm valve body 13 comes into contact with the main valve seat 12 in response to an increase in the internal pressure of the back chamber 106.

After the main valve 11 is closed, water is output from the output port 104 by the force of inertia. Therefore, the valve hole 103 of the pilot solenoid valve 1 is in a negative pressure state. After that, the water output from the output port 104 is pulled back to the negative pressure region. Therefore, the diaphragm valve body 13 receives a force in a direction away from the main valve seat 12 after abutting on the main valve seat 12. However, the back chamber 106 has a smaller air pool E and is filled with a large amount of water as compared with the conventional pilot solenoid valve 100 shown in FIG. Therefore, the diaphragm valve body 13 does not separate from the main valve seat 12 even if it is pressurized in the direction opposite to the main valve seat 12 by the water pulled back to the negative pressure region.

Therefore, even if the pilot solenoid valve 1 is attached to the pipe in a posture in which the communication passage 112 is below the poppet valve seat 21 and the diaphragm valve body 13 is displaced in the horizontal direction, the application of voltage is stopped. , The diaphragm valve body 13 is smoothly displaced toward the main valve seat 12 in response to an increase in the internal pressure of the back chamber 106, and abuts on the main valve seat 12. That is, the pilot solenoid valve 1 shuts off water without causing chattering when the main valve 11 starts to close. Therefore, the pilot solenoid valve 1 can suppress pressure fluctuations when the water supply is stopped and prevent the piping from shaking.

The inventors replaced the pilot solenoid valve 100 of the first test circuit shown in FIG. 5 (a) with the pilot solenoid valve 1, and under the same conditions as the test performed on the conventional pilot solenoid valve 100, the valve A pressure fluctuation confirmation test was conducted during opening and closing. As a result, no pressure fluctuation was confirmed in the primary side pressure P1 and the secondary side pressure P2 when the valve was opened and closed. In addition, no visual shaking of the piping was confirmed. Further, the inventors replace the pilot solenoid valve 100 shown in FIGS. 5 (b) and 5 (c) with the pilot solenoid valve 1, and confirm the pressure fluctuation confirmation test and the visual vibration of the pipe when the valve is opened and closed. A test was conducted, but no pressure fluctuation or swaying of the piping was confirmed.

That is, the pilot solenoid valve 1 can suppress chattering regardless of the mounting posture. Further, the pilot solenoid valve 1 can suppress chattering even when a long pipe arranged along the vertical direction is connected to the output port 104 with the output port 104 facing upward.

As described above, the pilot solenoid valve 1 of the present embodiment energizes the electromagnetic poppet valve 20 even when it is attached to the pipe in a posture in which the communication passage 112 is arranged below the poppet valve seat 21, for example. When the poppet valve body 22 is separated from the poppet valve seat 21, the air accumulated in the back chamber 106 escapes to the poppet chamber 113 through the through hole 2. Therefore, the residual amount of air remaining in the back chamber 106 is suppressed, and the diaphragm valve body 13 is smoothly displaced according to the pressure difference between the back chamber 106 side and the output port 104 side. Therefore, according to the pilot solenoid valve having the above configuration, chattering that occurs when the valve is opened and closed can be suppressed without being restricted by the mounting posture and the length of the pipe connected to the output port 104.

By suppressing the occurrence of chattering, the pilot solenoid valve 1 is less likely to generate an abnormal noise when opening and closing the valve. Further, even when the PVC pipe is connected to the pilot solenoid valve 1, the PVC pipe is less likely to be fatigued and broken due to vibration, and the pipe life can be extended. Further, the pilot solenoid valve 1 can stabilize the output flow rate of water.

Since the above effect can be obtained only by additionally processing the through hole 2 in the conventional pilot solenoid valve 100, the chattering suppression function can be easily and inexpensively added to the current product.

The present invention is not limited to the above embodiment, and various applications are possible. For example, the pilot solenoid valve 1 may be used for controlling a fluid other than water.

The input port 101 and the output port 104 do not have to be formed coaxially. For example, the input port 101 and the output port 104 may be formed with a phase difference of 90 °, or the output port 104 may be formed coaxially with the valve hole 103.

The communication passage 112 and the first bypass passage 111 may be provided separately. That is, a part of the communication passage 112 and the first bypass flow path 111 may not be formed by one through hole.

The flow path inner diameter Y3 of the through hole 2 may be made larger than the opening inner diameter Y1 of the poppet valve seat 21, and the opening area of the through hole 2 opening into the poppet chamber 113 may be larger than the opening area of the poppet valve seat 21. .. However, as in the above embodiment, when the opening area of the through hole 2 is smaller than the opening area of the poppet valve seat 21 and the opening area of the communication passage 112 is larger than the opening area of the poppet valve seat 21, water flows from the communication passage 112 to the poppet. By utilizing the momentum flowing into the second bypass flow path 114 through the chamber 113, it is possible to promote the air bleeding of the air accumulated in the back chamber 106 to the poppet chamber 113 through the through hole 2, and when the valve is opened or closed. It is possible to efficiently suppress the chattering that occurs. There may be a plurality of through holes 2. In this case, it is preferable that the total area of the plurality of through holes 2 opening in the poppet chamber 113 is smaller than the opening area of the poppet valve seat 21.

1 Pilot solenoid valve 2 Through hole 10 Valve body 11 Main valve 12 Main valve seat 13 Diaphragm valve body 20 Electromagnetic poppet valve 21 Poppet valve seat 22 Poppet valve body 101 Input port 103 Valve hole 106 Back chamber 111 First bypass flow path 112 Consecutive passage 113 Poppet chamber 114 Second bypass flow path

Claims (3)

A main valve that controls the fluid flowing from the input port to the output port by abutting or separating the diaphragm valve body from the main valve seat provided between the input port and the output port, and the main valve. An electromagnetic type that controls the pressure in the back chamber of the diaphragm valve body by contacting or separating the poppet valve body from the poppet valve seat, which is attached to the valve body and is attached to the valve body, in response to the energization of the coil. A first bypass flow path comprising a poppet valve and having the valve body communicating the input port and the back chamber, a poppet chamber provided with the poppet valve seat, and the poppet chamber and the back chamber communicating with each other. In a pilot solenoid valve formed with a communication passage for communication and a second bypass flow path for communicating the poppet chamber and the output port.
The valve body has a through hole for communicating the poppet chamber and the back chamber.
The through hole is provided at a position orthogonal to the axis passing through the center of the poppet valve seat and the center of the communication passage and at a position opposite to the communication passage from the center line passing through the center of the poppet valve seat. A pilot solenoid valve characterized by being In the pilot solenoid valve according to claim 1,
The first bypass flow path, the communication passage, the poppet valve seat, and the second bypass flow path are arranged on the axis line passing through the center of the poppet valve seat and the center of the communication passage .
The communication passage is provided on the first bypass flow path side from the poppet valve seat.
The through hole shall be provided on the second bypass flow path side from the center line.
A pilot solenoid valve featuring. In the pilot solenoid valve according to claim 1 or 2.
The opening area of the through hole opening into the poppet chamber is smaller than the opening area of the poppet valve seat.
A pilot solenoid valve characterized in that the opening area of the communication passage opening into the poppet chamber is larger than the opening area of the poppet valve seat.

Images