JP2006300112A - Pilot valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilot valve with its valve function not impaired by freezing of water in small holes by draining water in a back pressure chamber in a short time and preventing water from remaining in the small holes such as an introduction small hole and pilot small holes communicating with the back pressure chamber. <P>SOLUTION: This pilot valve 28 comprises a main valve 32 opening and closing a main water channel 26, the back pressure chamber 34 acting a pressure therein on the main valve 32 as a pressing force in the valve closing direction, the introduction small hole 36 introducing water in a primary side water channel 26A in the main water channel 26 to the back pressure chamber 34, the pilot small hole 38 running out water in the back pressure chamber 34, and the pilot valve 42 opening and closing the pilot small hole 38. The pilot valve 28 further comprises an air feed device for blowing off residual water by supplying pressurized air to the back pressure chamber 34 and the small holes such as the introduction small hole 36 and the pilot small hole 38. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pilot type valve, and more particularly to a pilot type valve having a function of draining water.

  Conventionally, a main valve that opens and closes the main water channel, a back pressure chamber that causes the internal pressure to act as a pressing force in the valve closing direction on the main valve, and a primary water channel and a back pressure chamber in the main water channel communicate with each other, A pilot-type valve having an introduction small hole for introducing water in the primary side water channel into the back pressure chamber, a pilot small hole for discharging the water in the back pressure chamber, and a pilot valve for opening and closing the pilot small hole for various applications It is used.

  By the way, in cold regions, if water remains in the back pressure chamber of such a pilot valve, there is a problem that freezing occurs at night and the valve is damaged due to volume expansion due to freezing. It is necessary to drain water at night or the like in a pilot type valve.

Patent Document 1 listed below discloses a pilot valve having a water draining function.
In the one disclosed in Patent Document 1, the discharge function portion in the back pressure chamber is pushed up in the valve opening direction by the manual operation portion 13 to connect the back pressure chamber and the secondary side water channel, thereby water in the back pressure chamber is communicated. Is discharged to the secondary side water channel to open the diaphragm valve as the main valve, and in addition to this, the secondary side water channel and the discharge hole are communicated to drain water.

Patent Document 2 below also discloses a pilot valve having a water draining function.
In the one disclosed in Patent Document 2, the push-up rod is pushed up by the operation of the operation rod, the diaphragm valve as the main valve is forcibly opened, and water freezes at the contact portion between the diaphragm valve and the valve seat. The diaphragm valve and the valve seat are prevented from sticking to each other.

However, since those disclosed in Patent Document 1 and Patent Document 2 drain water by the action of gravity, it takes time to drain water, and even after draining operation, water is applied to the inner surface of the back pressure chamber by surface tension. There is a problem that water remains, and in particular, there is a problem that water remains due to surface tension inside the introduction small hole or pilot small hole communicating with the back pressure chamber.
Thus, when the water remaining in these small holes is frozen due to surface tension, the pilot valve itself does not function.

JP 2000-266196 A Japanese Patent No. 3567532

  In the present invention, against the background described above, water in the back pressure chamber can be extracted in a short time, and water is introduced into the small holes of the introduction small hole and the pilot small hole communicating with the back pressure chamber. The purpose of the present invention is to provide a pilot valve that prevents the valve function from being impaired by the remaining and freezing of water in the small holes.

  Thus, according to the first aspect of the present invention, (a) a main valve that opens and closes the main water channel, (b) a back pressure chamber that acts on the main valve as a pressing force in the valve closing direction, c) a primary side channel in the main channel and the back pressure chamber communicating with each other, an introduction small hole for introducing the water in the primary side channel into the back pressure chamber, and (d) water in the back pressure chamber. A pilot-type valve having a pilot small hole that flows out and (e) a pilot valve that opens and closes the pilot small hole. Pressurized air is supplied to each small hole of the back pressure chamber, the introduction small hole, and the pilot small hole. An air supply device for supplying and blowing away residual water is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, a check valve for preventing the water in the valve from flowing back is provided in the pressurized air supply path.

  According to a third aspect of the present invention, in the second aspect, the check valve is incorporated in a valve body.

  According to a fourth aspect of the present invention, in the second aspect, the terminal of the pressurized air supply path is connected to the pilot small hole, and the check valve is provided in the pilot valve. .

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the main valve is a diaphragm valve.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the pilot valve is a ball tap water supply valve for supplying water into the cleaning tank.

Effects and effects of the invention

As described above, the present invention is provided with an air supply device for supplying pressurized air to the small holes of the back pressure chamber, the introduction small hole, and the pilot small hole in the pilot type valve to blow off the residual water. Therefore, water in the back pressure chamber can be drained quickly in a short time, and the water in each small hole of the introduction small hole and pilot small hole communicating with the back pressure chamber can be surely blown off by pressurized air. Can be removed.
Therefore, according to the present invention, it is possible to solve the problem that water remains in each small hole due to surface tension even after the draining operation. Therefore, the water remaining in each small hole is frozen and the valve function is impaired. Can be solved satisfactorily.
Here, the pressurized air supply path may be directly connected to the back pressure chamber, or may be connected to each small hole communicating with the back pressure chamber.

  In the present invention, it is desirable to provide a check valve for preventing the water in the valve from flowing backward in the pressurized air supply path (Claim 2).

In this case, the check valve can be incorporated in the valve body (claim 3).
In this way, the configuration of the apparatus can be simplified and the number of necessary parts can be reduced as compared with the case where a check valve is provided on the pressurized air supply path outside the valve body.

On the other hand, while connecting the terminal of the supply path of pressurized air to a pilot small hole, the above-mentioned check valve can also be provided in the pilot valve which opens and closes a pilot small hole.
Even in this case, the apparatus configuration can be simplified and the number of necessary parts can be reduced.
In this case, the pilot valve is provided with a fitting portion that fits into the pilot small hole up to the end position of the supply passage when the valve is closed, and the fitting portion can be used as a check valve.

  The present invention is particularly suitable when applied to the case where the main valve is a diaphragm valve.

  Further, the present invention can be suitably applied to a water supply valve of a ball tap that supplies water into the cleaning tank.

Next, an embodiment when the present invention is applied to a ball tap for supplying toilet cleaning water to the inside of a cleaning tank will be described in detail with reference to the drawings.
In FIG. 1, 10 is a cleaning tank, 12 is a ball tap disposed inside the cleaning tank 10, and 14 is a floating ball.
The floating ball 14 moves up and down in conjunction with the water level inside the cleaning tank 10.
The floating ball 14 is provided with a cylindrical fitting portion 16, and the fitting portion 16 is fitted to an outer peripheral surface of a guide pipe 20 (described later) suspended from a main body 18 of the ball tap 12.
The floating ball 14 moves up and down under the guidance of the guide pipe 20 and the fitting portion 16.

  The floating ball 14 is also provided with a connecting portion 22, and a lifting rod 24 is connected to the connecting portion 22. The lifting rod 24 moves up and down integrally with the floating ball 14.

As shown in FIG. 2, the ball tap 12 has a pilot valve 28 that opens and closes the main water channel 26.
The pilot type valve 28 is a diaphragm type valve, and shuts off the primary side water passage 26A and the secondary side water passage 26B in the main water passage 26 by being seated on or separated from the valve body 29 and the main valve seat 30. A main valve 32 comprising a diaphragm valve that communicates, that is, opens and closes the main water passage 26; a back pressure chamber 34 that is formed behind the main valve 32 and that acts on the main valve 32 as a pressing force in the valve closing direction; An introduction small hole 36 that penetrates the central portion of the valve 32, communicates the primary side water passage 26A and the back pressure chamber 34, and introduces the water of the primary side water passage 26A into the back pressure chamber 34, and the back pressure chamber. A pilot small hole 38 that communicates with the pilot valve 34 and allows the water in the back pressure chamber 34 to flow into the cleaning tank 10; and a pilot valve 42 that opens and closes the pilot small hole 38 by being seated on and separated from the pilot valve seat 40; It has.

In the normal state shown in FIG. 3, the pilot valve 28 maintains the main valve 32 in a closed state because the pressure inside the back pressure chamber 34 overcomes the water supply pressure.
When the pilot valve 42 is opened as shown in FIG. 5 in this state, the water in the back pressure chamber 34 flows out into the cleaning tank 10 through the pilot small hole 38.
Then, the pressure in the back pressure chamber 34 decreases and the main valve 32 opens due to the supply water pressure. Here, the main water channel 26 is opened and water flows from the primary side water channel 26A to the secondary side water channel 26B. And the water which flowed into the secondary side waterway 26B is discharged from the water discharge port 44.

Water discharged from the water discharge port 44 is guided by the guide pipe 20 and supplied into the cleaning tank 10.
A part of the water that has flowed into the secondary side water channel 26B is led to the hand-washing water discharge pipe at the upper part of the washing tank 10 through the connection pipe 45, and dropped from there into the hand-washing bowl.

On the other hand, when the pilot valve 42 is seated on the pilot valve seat 40 and the pilot small hole 38 is closed, the water in the primary water channel 26A flows into the back pressure chamber 34 through the introduction small hole 36, thereby causing a back pressure. The pressure inside the pressure chamber 34 increases, and the pressing force in the valve closing direction against the main valve 32 is increased.
When the pressing force overcomes the water supply pressure, the main valve 32 is closed and the main water channel 26 is closed.

As shown in FIG. 4, the ball tap 12 has an opening / closing mechanism 46 for opening and closing the pilot valve 28.
The opening / closing mechanism 46 includes the lifting rod 24 that moves up and down integrally with the floating ball 14, and an action arm 48 having one end connected to the upper end of the lifting rod 24 so as to be relatively rotatable.
An opening / closing lever 50 is connected to the other end portion of the working arm 48 so as to be integrally rotated around the shaft 52, and the pilot valve 42 is integrally provided at the lower end portion of the opening / closing lever 50.

  In this ball tap 12, when the drain valve at the bottom of the washing tank 10 is opened and the water in the washing tank 10 is discharged to the toilet side through the discharge port, the inside of the washing tank 10 as shown in FIG. As the water level of the water drops, the floating ball 14 descends, and when the floating ball 14 descends, the opening / closing lever 50 is opened, and the pilot valve 42 opens as shown in FIG.

Here, the water in the back pressure chamber 34 flows out into the cleaning tank 10 through the pilot small hole 38, and the main valve 32 including a diaphragm valve is opened at the same time, and the water in the main water channel 26 passes through the water outlet 44. 10 is supplied with water.
Thereafter, as the water level in the cleaning tank 10 rises (at this time, the discharge valve at the bottom of the cleaning tank 10 is closed), the opening / closing lever 50 is gradually rotated in the closing direction by the opening / closing mechanism 46, When the water in the washing tank 10 becomes full, the pilot valve 42 is closed here, and subsequently, the main valve 32 is closed and the water supply into the washing tank 10 is stopped.

The pilot valve 28 of the present embodiment is provided with an air supply device 54 for supplying pressurized air as shown in FIG.
The air supply device 54 includes a supply source 56 of pressurized air such as a manual pump, a mechanical pump, an electric pump, or a compressor, and an air pipe 58 extending therefrom, and the air pipe 58 is a valve body 29. It is connected to a cylindrical connecting pipe 60 provided in.

2 and 3, reference numeral 62 denotes a pressurized air supply passage formed by an internal passage of the air pipe 58, an internal passage of the connection pipe 60, an internal passage formed in the valve body 29, etc. It opens toward the chamber 34.
That is, in this embodiment, pressurized air from the supply source 56 is blown (supplied) into the back pressure chamber 34 through the supply path 62.

As shown in FIG. 3, the valve body 29 is fitted with a check valve 64 that prevents water in the back pressure chamber 34 from flowing back through the supply passage 62 in a recess 66 formed in the valve body 29. Built in.
The check valve 64 is entirely composed of an elastic body such as rubber.
The check valve 64 has a main body portion 68 and an elastic piece 70 that can be opened and closed. When pressurized air is supplied to the supply passage 62, the elastic piece 70 is moved by the pressure as shown in FIG. Opening operation is performed, and pressurized air is ejected into the back pressure chamber 34 through the internal passage 72 formed in the main body 68.
Here, the internal passage 72 of the main body 68 also forms part of the supply passage 62.

  On the other hand, when the pressurized air is not supplied, the elastic piece 70 is in a closed state, the internal passage 72 of the main body 68 is shut off, that is, the supply passage 62 is shut off, and the water in the back pressure chamber 34 is supplied to the supply passage. 62 is prevented from flowing backward.

6 and 7 show the action at the time of draining in this embodiment.
FIG. 6 shows a state in which the pilot valve 42 is opened and water in the pipe is drained.
At this time, a part of water remains in the back pressure chamber 34, and water remains in the introduction small hole 36 and the pilot small hole 38 due to surface tension.

Therefore, in the present embodiment, as shown in FIG. 7, the pressurized air is jetted into the back pressure chamber 34 through the supply path 62 using the air supply device 54.
As a result, water partially remaining in the back pressure chamber 34 and further water remaining in the introduction small hole 36 and the pilot small hole 38 are blown off by the air jet power, and the back pressure chamber 34 and the introduction are introduced. Water inside each of the small holes 36 and the pilot small holes 38 is completely removed.

According to the present embodiment as described above, the water in the back pressure chamber 34 can be drained quickly in a short time, and each of the introduction small hole 36 and the pilot small hole 38 communicating with the back pressure chamber 34 is small. Water in the holes can also be reliably removed by the action of blowing pressurized air.
Therefore, according to the present embodiment, it is possible to solve the problem that water remains in the small holes even after draining operation due to surface tension. The problem of losing can be solved.

As described above, in this embodiment, the check valve 64 that prevents the water in the back pressure chamber 34 from flowing back through the supply path 62 is incorporated in the valve body 29.
For example, when a check valve is provided on the supply passage 62 outside the valve body 29, it should be connected to the air pipe 58 as a check valve device 74 including a check valve and a valve casing as shown in FIG. This complicates the apparatus configuration and increases the number of necessary parts.
In addition, man-hours for assembling the check valve device 74 are required.

  However, if the check valve 64 is incorporated in the valve body 29 in advance, the device configuration can be simplified, the number of necessary parts can be reduced, and the number of assembly steps can be reduced, thereby reducing the device cost. Can do.

FIG. 9 shows another embodiment of the present invention.
In this example, the end of the pressurized air supply passage 62 is connected to the pilot small hole 38, and the pilot valve 42 is integrally provided with a fitting portion that fits into the pilot small hole 38 when the valve is closed. This is an example in which the end of the supply passage 62 is closed and a check valve 76 is provided to prevent the water in the back pressure chamber 34 from flowing back through the supply passage 62.
In this embodiment, the pilot valve 42 is provided at an intermediate portion of the opening / closing lever 78 that rotates about the shaft 52.
Further, the upper end portion of the elevating rod 24 is connected to the upper end portion of the open / close lever 78 so as to be relatively rotatable.

  Also in this embodiment, the configuration of the apparatus can be simplified as compared with the case where the check valve is connected to the outside of the valve body 29 in the middle of the supply passage 62, specifically in the middle of the air pipe 58, and the necessary parts. The score can be reduced.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the present invention can be applied to a pilot type valve provided with a piston type main valve, and in addition to application to a ball tap pilot type valve, the pilot type valve in the faucet or the flush water of the toilet bowl is supplied to the rim. The present invention can be applied to a switching valve that switches between a water supply side and a jet water supply side, and can also be applied to an electromagnetic valve using a diaphragm valve as a main valve. It can be configured in a modified form.

It is a figure which shows the ball tap containing the pilot type valve of one Embodiment of this invention, and its peripheral part. It is sectional drawing which expands and shows the principal part of FIG. It is sectional drawing which expands and shows the principal part of FIG. It is explanatory drawing which shows the opening / closing mechanism of the pilot valve of the ball tap of FIG. 1 with the effect | action. It is explanatory drawing which shows one action state of the pilot type valve of the embodiment. It is explanatory drawing which shows another action state of the pilot type valve of the embodiment. It is explanatory drawing which shows another action state of the embodiment. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Washing tank 12 Ball tap 26 Main water channel 26A Primary side water channel 26B Secondary side water channel 28 Pilot type valve 29 Valve body 32 Main valve 34 Back pressure chamber 36 Introduction small hole 38 Pilot small hole 42 Pilot valve 54 Air supply device 62 Supply channel 64 Check valve 76 Check valve

Claims (6)

(a) a main valve that opens and closes the main water channel; (b) a back pressure chamber that acts on the main valve as a pressing force in the valve closing direction; and (c) a primary water channel in the main water channel. An inlet small hole for communicating the water in the primary water channel into the back pressure chamber; (d) a pilot small hole for allowing the water in the back pressure chamber to flow out; and (e) An air supply device for supplying pressurized air to each of the back pressure chamber, the introduction small hole, and the pilot small hole so as to blow away residual water. A pilot type valve characterized by being provided.   2. The pilot valve according to claim 1, wherein a check valve for preventing the water in the valve from flowing backward is provided in the pressurized air supply path.   3. The pilot valve according to claim 2, wherein the check valve is incorporated in a valve body.   3. The pilot valve according to claim 2, wherein a terminal end of the pressurized air supply path is connected to the pilot small hole, and the check valve is provided in the pilot valve.   5. The pilot valve according to claim 1, wherein the main valve is a diaphragm valve.   6. The pilot valve according to claim 1, wherein the pilot valve is a water supply valve of a ball tap that supplies water into the cleaning tank.

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