JP2008196669A - Pilot type on-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilot type on-off valve which prevents a water shutoff failure by preventing air from remaining in a back-pressure chamber even when the back-pressure chamber is brought into an attitude positioned on the upper side of a diaphragm valve. <P>SOLUTION: This pilot type on-off valve is provided with: an inflow chamber 6; an outflow passage 7; the diaphragm valve 8 opening/closing a valve seat 5 communicating with the outflow passage 7; the back-pressure chamber 10 formed on the back side of the diaphragm valve 8; an orifice 13 making the inflow chamber 6 communicate with the back-pressure chamber 10; a communication hole 11 making the back-pressure chamber 10 communicate with the outflow passage 7; and a pilot solenoid valve 12 opening/closing a pilot hole 24 interlaid in the communication hole. One end of the communication hole 11 is opened at a side position of the diaphragm valve 8 in the back-pressure chamber 10. When the back-pressure chamber 10 is brought into an attitude located at the upper-side position of the diaphragm valve 8, an inside wall surface of the back-pressure chamber 10 facing the diaphragm valve 8 is formed into an inclined surface 9a inclined in a direction gradually ascending toward an opening 11a of the communication hole 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pilot-type on-off valve provided with a diaphragm valve that is built in a hot water supply device or the like and opens and closes a water supply path.

  Conventionally, a valve seat that communicates with the outflow passage, an inflow chamber that surrounds the valve seat, and a diaphragm valve that is attached to cover the inflow chamber in a state of being opposed to the axial direction of the valve seat and opens and closes the valve seat A back pressure chamber provided on the back side of the diaphragm valve, an orifice hole for communicating the inflow chamber with the back pressure chamber, a communication hole for communicating the back pressure chamber with the outflow passage, and the communication hole There is known a pilot type on-off valve including a pilot solenoid valve that opens and closes an interposed pilot hole (for example, see Patent Document 1).

  This type of pilot type on-off valve is provided, for example, in a water supply channel of a hot water supply device, and when tap water flows into the inflow chamber with the pilot hole closed and the communication hole closed by the pilot solenoid valve, Tap water flows into the back pressure chamber through the orifice hole, and the pressure in the back pressure chamber and the pressure in the inflow chamber become equal to each other. Thereby, the valve closing state (water stop state) of the diaphragm valve is maintained.

  From this state, when the pilot hole is opened by the pilot solenoid valve and the communication hole is made conductive, the water in the back pressure chamber escapes into the outflow passage and the pressure in the back pressure chamber is released. As a result, the diaphragm valve is opened, and the water in the inflow chamber immediately flows out to the outflow passage (water flow state).

  And when the pilot hole is closed by the pilot solenoid valve and the communication to the outflow passage of the back pressure chamber is closed, the pressure of the inflow chamber propagates again through the orifice hole to the back pressure chamber, and the diaphragm valve moves to the valve seat. It is pressed to enter a closed valve state (water stop state).

By the way, in the pilot type on-off valve having such a configuration, for example, the mounting posture to the hot water supply device differs depending on the installation form of the hot water supply device (wall-mounted type or floor-mounted type). In some cases, the back pressure chamber is mounted in a posture positioned above the diaphragm valve. In this case, residual air at the time of the first water flow or air mixed in the water tends to accumulate in the back pressure chamber, especially if air accumulation occurs in the back pressure chamber at a position away from the communication hole, Even if a water flow is formed in the room, air does not escape from the communication hole, and air remains in the back pressure room. Then, the air remaining in the back pressure chamber acts as a cushion and compresses and expands, so that vibration that continues in the diaphragm valve is generated, resulting in inconvenience that water stop failure occurs.
JP 2004-138211 (FIG. 3)

  In view of such a background, the present invention provides a pilot-type on-off valve that can prevent water from remaining in the back pressure chamber and prevent water shutoff even when the back pressure chamber is positioned above the diaphragm valve. The purpose is to provide.

  In order to achieve such an object, the present invention is attached to a valve seat communicating with an outflow passage, an inflow chamber surrounding the valve seat, and an inflow chamber covering the valve seat in an axial direction. A diaphragm valve that opens and closes the valve seat, a back pressure chamber provided on the back side of the diaphragm valve, an orifice hole that connects the inflow chamber to the back pressure chamber, and the back pressure chamber to the outflow passage. A pilot-type on-off valve comprising a communication hole for communication and a pilot solenoid valve for opening and closing the pilot hole provided in the communication hole, and one end of the communication hole is opened at a side position of the diaphragm valve in the back pressure chamber The inner wall surface of the back pressure chamber facing the diaphragm valve is inclined so as to gradually rise toward the opening side of the communication hole when the back pressure chamber is in a position above the diaphragm valve. The surface It is characterized in.

  According to the pilot type on-off valve of the present invention, the inner wall surface of the back pressure chamber facing the diaphragm valve is the inclined surface, so that the back pressure chamber is positioned above the diaphragm valve in a hot water supply device or the like. When the pilot type on-off valve of the present invention is attached to the posture, the air remaining in the back pressure chamber is guided by the inclined surface and moves toward the opening side of the communication hole. As a result, when the pilot hole is opened by the pilot solenoid valve, the communication hole becomes conductive, and when a water flow is formed in the back pressure chamber through the communication hole, the air in the back pressure chamber accumulated on the opening side of the communication hole is Go out to the outflow passage.

  As described above, according to the present invention, even if the back pressure chamber is positioned above the diaphragm valve, air can be prevented from remaining in the back pressure chamber, and the diaphragm valve is closed to stop the water supply during water supply. Sometimes the diaphragm valve does not continue to vibrate, and water can be reliably stopped.

  In the present invention, it is preferable that the opening of the communication hole is provided at a position directly below the rising end of the inclined surface. According to this, since the opening of the communication hole is close to the air that has moved and accumulated at the rising end of the inclined surface, the air that has moved to the rising end of the inclined surface can be quickly It can be made to escape from the communication hole to the outflow passage, and water stop failure can be prevented more reliably.

  An embodiment of the present invention will be described with reference to the drawings. The pilot type on-off valve 1 of the present embodiment is used as a water supply valve of a floor-mounted hot water supply device (not shown). In FIG. 1, reference numeral 2 denotes a valve block constituting a part of the pilot type on-off valve 1. The valve block 2 is formed with an inflow port 3 and an outflow port 4, and further has a cylindrical main valve seat 5 (valve seat), an inflow chamber 6 surrounding the main valve seat 5, and an outflow port 4. And an outflow passage 7 that is communicated with each other. The inflow chamber 6 is formed continuously with the inflow port 3, and the outflow passage 7 is formed continuously with the inner peripheral space of the main valve seat 5.

  A diaphragm valve 8 that covers the inflow chamber 6 in a state of being opposed to the main valve seat 5 is mounted on a side surface of the valve block 2 in which the inflow chamber 6 is open, and a peripheral portion of the diaphragm valve 8 is a diaphragm cover from the back side. 9 is pressed down.

  A back pressure chamber 10 is defined between the diaphragm valve 8 and the diaphragm cover 9. The valve block 2 is formed with a communication hole 11 for leaking the fluid in the back pressure chamber 10 to the outflow passage 7, and a pilot electromagnetic valve 12 is interposed in the communication hole 11. An opening 11 a on the back pressure chamber 10 side of the communication hole 11 is located on the side of the diaphragm valve 8. The valve block 2 is formed with an orifice hole 13 that communicates with a part of the communication hole 11 and introduces the fluid in the inflow chamber 6 into the back pressure chamber 10.

  Further, the inner wall surface of the diaphragm cover 9 facing the diaphragm valve 8 is an inclined surface 9a. This inclined surface 9a is a communication hole in the back pressure chamber 10 when the pilot type on-off valve 1 of the present embodiment is in a posture in which the back pressure chamber 10 is positioned above the diaphragm valve 8 (the posture shown in FIG. 1). 11 is inclined at a predetermined angle (in the present embodiment, an angle of about 5 degrees) in a direction gradually rising toward the opening 11a side. That is, the opening 11a of the communication hole 11 is provided immediately below the inclined surface 9a.

  As shown in FIGS. 1 and 2, the diaphragm valve 8 is attached with a hard disk 14 on the back side, and the hard disk 14 protrudes to the front side of the diaphragm valve 8 and protrudes from the main valve seat 5. A guide projection 15 that can be inserted into the diaphragm cover 9 and a guide hole 17 that receives a pin portion 16 that projects from the inside of the diaphragm cover 9 are formed. The guide protrusion 15 and the guide hole 17 prevent the diaphragm valve 8 from being inclined and the like, so that the diaphragm valve 8 is displaced in the axial direction of the main valve seat 5.

  As shown in FIG. 1, the pilot solenoid valve 12 includes a solenoid 18 and a resin guide sleeve 19 that protrudes forward from the inner periphery of the solenoid 18. A valve body 20 is slidably held on the guide sleeve 19, and the valve body 20 is urged forward by a spring 22 interposed between the fixed iron core 21 at the rear end of the guide sleeve 19. Yes. When the solenoid 18 is energized, the valve body 20 is magnetically attracted backward (fixed iron core 21 side) by the fixed iron core 21. Further, a valve seat 23 on which the valve body 20 is seated by the urging force of the spring 22 is provided on the distal end side of the guide sleeve 19. The valve seat 23 includes a pilot hole 24 that constitutes a part of the communication hole 11, and when the pilot hole 24 is closed by the valve body 20 of the pilot solenoid valve 12, the communication hole 11 is in a closed state. .

  In this embodiment, although not shown in figure, the inflow port 3 is connected to a water pipe, and the outflow port 4 is connected to piping at the heat exchanger side of a hot water supply apparatus. According to the above configuration, when the pilot solenoid valve 12 is closed (when no power is supplied), tap water flowing into the inflow chamber 6 from the inlet 3 (hereinafter simply referred to as water) communicates from the orifice hole 13. It enters the back pressure chamber 10 through a part of the hole 11 (portion on the back pressure chamber 10 side from the pilot hole 24 closed by the pilot solenoid valve 12). Thereby, the diaphragm valve 8 is pushed by the water pressure in the back pressure chamber 10, and is seated on the main valve seat 5 to be in a water stop state. When the pilot solenoid valve 12 is energized and opened, the water in the back pressure chamber 10 is discharged to the outflow passage 7 through the communication hole 11, the water pressure in the back pressure chamber 10 is lowered, and the diaphragm valve 8 is moved to the main valve seat 5. The valve is separated from the valve. As a result, water flows from the inflow chamber 6 to the outflow passage 7 through the opened main valve seat 5 and enters a water flow state.

  Here, in this embodiment, the pilot on-off valve 1 is assumed to be attached to a floor-standing type hot water supply device, and as shown in FIG. 1, the inlet 3 is directed horizontally and the outlet 4 is directed downward. The back pressure chamber 10 is attached in such a posture as to be positioned above the diaphragm valve 8. For this reason, when air enters the back pressure chamber 10 by mixing with water, the air accumulates on the upper inner wall surface of the back pressure chamber 10 (the inner wall surface facing the diaphragm valve 8 of the back pressure chamber 10). At this time, as described above, since the inner wall surface of the back pressure chamber 10 facing the diaphragm valve 8 is the inclined surface 9a, the air (bubble x) in the back pressure chamber 10 as shown in FIG. Is guided by the inclined surface 9a and moves toward the rising end of the inclined surface 9a. The bubbles x moved to the opening 11a side of the communication hole 11 gather at a position immediately above the opening 11a close to the opening 11a of the communication hole 11 (air reservoir x '). The air reservoir x' The water flow y generated by opening the valve quickly and smoothly sucks into the opening 11 a of the communication hole 11, smoothly exits the back pressure chamber 10, and is discharged into the outflow passage 7. As a result, it is possible to prevent the air from remaining in the back pressure chamber 10 and to prevent the diaphragm valve 8 from vibrating continuously when the valve is closed. .

  Further, in the present embodiment, the inner wall surface facing the diaphragm valve 8 is the inclined surface 9a inclined at an angle of about 5 degrees as described above, so that the pilot on-off valve 1 can be mounted inside the hot water supply device. Even if the diaphragm valve 8 is inclined and attached to the opposite side of the inclined direction of the inclined surface 9a, the air in the back pressure chamber 10 communicates along the inclined surface 9a if the attached inclination angle is less than 5 degrees. Since it can be moved to the opening 11a side of the hole 11, there is a margin in the mounting accuracy. In addition, for example, when the pilot-type on-off valve 1 is installed in the hot water supply apparatus with the inlet 3 being accurately oriented in the horizontal direction, when the hot water supply apparatus is installed inclined, the diaphragm valve 8 May be inclined to the opposite side of the inclination direction of the inclined surface 9a. In this case, too, if the inclination angle of the installation state is less than 5 degrees, the air in the back pressure chamber 10 is moved along the inclined surface 9a Since it can be moved to the opening 11a side of the communication hole 11, a margin can be provided for the inclination of the installed state of the hot water supply apparatus.

  In the present embodiment, the case where the pilot-type on-off valve 1 is employed as a water supply valve of a floor-mounted water heater has been described. However, the pilot-type on-off valve 1 can be used as a floor-mounted water heater. It is not limited to a device.

Sectional drawing which shows the pilot type on-off valve of one Embodiment of this invention. Explanatory drawing which shows the principal part of the pilot type on-off valve of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pilot type on-off valve, 5 ... Main valve seat (valve seat), 6 ... Inflow chamber, 7 ... Outflow passage, 8 ... Diaphragm valve, 9a ... Inclined surface, 10 ... Back pressure chamber, 11 ... Communication hole, 11a ... Opening, 12 ... pilot solenoid valve, 13 ... orifice hole, 24 ... pilot hole.

Claims (2)

A valve seat communicating with the outflow passage, an inflow chamber surrounding the valve seat, a diaphragm valve attached to cover the inflow chamber in a state of facing the axial direction of the valve seat, and opening and closing the valve seat; A back pressure chamber provided on the back side of the diaphragm valve; an orifice hole for communicating the inflow chamber with the back pressure chamber; a communication hole for communicating the back pressure chamber with the outflow passage; A pilot solenoid valve that opens and closes the pilot hole, wherein the one end of the communication hole opens at a side position of the diaphragm valve in the back pressure chamber.
When the back pressure chamber is in a position above the diaphragm valve, the inner wall surface of the back pressure chamber facing the diaphragm valve is inclined so as to gradually rise toward the opening side of the communication hole. A pilot-type on-off valve characterized by   2. The pilot type on-off valve according to claim 1, wherein the opening of the communication hole is provided at a position directly below the rising side end of the inclined surface.

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