JP2009264485A - Water supply valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply valve device which uses a compact electric motor small in output, and excellently operates a pilot type valve member by an operation shaft. <P>SOLUTION: A water supply valve device 24 includes: the pilot type valve member; and an operation shaft 56 which extends to the valve member side through a secondary side outflow channel 34, and advances and retreats a pilot valve 45 on outflow channel 34 side, and the device 24 makes a flow capacity adjustment of main channel by an operation in which the pilot valve 45 is advanced and retreated by the operation shaft 56. The operation shaft 56 is axially driven by a stepping motor. A pressure removing hole 88 making a back pressure chamber 44 communicate with the outflow channel 34, and a pressure removing valve 92 opening/closing the pressure removing hole 88 on the back pressure chamber 44 side, are arranged. The pressure removing valve 92 is opened through a pressure removing pin 54 formed in fine diameter. A pressure staying inside the back pressure chamber 44 is processed in pressure removing, and the pilot valve 45 is then retreated to a valve opening side by the operation shaft 56. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water supply valve device, and more particularly to a water supply valve device configured to operate a pilot-type valve unit with an operation shaft from a secondary outflow water channel side.

  Conventionally, as a water supply valve device, the following water supply valve device, that is, (A) (a) a main valve that moves forward and backward toward the main valve seat and changes the opening of the main water channel; A back pressure chamber that acts on the main valve as a pressing force in the closing direction with respect to the main valve, and (c) the water in the primary inflow channel in the main water channel is guided to the back pressure chamber. An inlet small hole that increases the pressure in the chamber, and (d) is provided through the main valve. The back pressure chamber communicates with the secondary outflow water channel in the main water channel, so that the water in the back pressure chamber flows into the outflow water channel. A pilot-type valve section having a pilot hole that is pulled out to reduce the pressure in the back pressure chamber, and (e) a pilot valve that moves forward and backward toward the pilot valve seat provided in the main valve on the back pressure chamber side, and (B) The valve body extends from the valve body through the secondary effluent water channel to the valve unit side, and the pilot valve moves forward and backward on the effluent water channel side. It includes an operating shaft that is separate from the lot valve, and the main valve moves forward and backward in the same direction following the forward and backward movement of the pilot valve by the operation of the pilot valve moving forward and backward with the operating shaft, thereby adjusting the flow rate of the main water channel. A water supply valve device to perform is known.

For example, Patent Document 1 below discloses this type of water supply valve device.
FIG. 11 shows a specific example thereof.
In the figure, reference numeral 200 denotes a valve body, which is provided with a primary inflow water channel 202 and a secondary outflow water channel 204, and a pilot type on a main water channel formed by the inflow water channel 202 and the outflow water channel 204. The valve part is provided.
Reference numeral 208 denotes a main valve formed of a diaphragm valve in the pilot type valve portion, which moves forward and backward toward the main valve seat 206 to change the opening of the main water channel.

210 is a back pressure chamber formed behind the main valve 208, and 212 is an introduction small hole that passes through the main valve 208 and connects the back pressure chamber 210 and the primary inflow water passage 202.
The introduction small hole 212 increases the pressure of the back pressure chamber 210 by guiding the water in the primary inflow water channel 202 to the back pressure chamber 210.
Reference numeral 214 denotes a pilot hole that passes through the main valve 208 and allows the back pressure chamber 210 to communicate with the secondary side outflow water channel 204. Reference numeral 218 denotes a pilot valve seat 216 provided in the main valve 208 on the back pressure chamber 210 side. This is a pilot valve that moves forward and backward.

The water supply valve device also has an operation shaft 220 that extends from the valve body 200 and moves the pilot valve 218 forward and backward on the secondary outflow water channel 204 side.
In this water supply valve device, the main valve 208 is moved forward and backward in the same direction following the forward and backward movement of the pilot valve 218 by the operation of the forward and backward movement of the pilot valve 218 by the operation shaft 220 to adjust the flow rate of the main water channel.

  However, in this water supply valve device, the operation shaft 220 is inserted into the pilot hole 214 and brought into contact with the pilot valve 218, and the pilot valve 218 is moved forward and backward by movement of the operation shaft 220 in the axial direction. The hole diameter of the pilot hole 214 inevitably increases, and a large force is required to open the pilot valve 218 under the valve closing state.

  Under the closed state of the pilot valve 218 and the main valve 208, a back pressure is generated in the back pressure chamber 210. When the hole diameter of the pilot hole 214 is large, the back pressure chamber 210 is closed against the pilot valve 218 under the closed state. Since a large downward pressing force in the figure due to the squeezing pressure in the pressure chamber 210 is generated, a large operating force is required when the pilot valve 218 in the closed state is opened by the operating shaft 220. is there.

In this case, when the operation shaft 220 is moved in the axial direction by manual operation and the pilot valve 218 is opened, the above problem is not so large, but an electric motor is connected to the operation shaft 220 to operate the operation shaft. When 220 is driven electrically, if the electric motor is small and has a small output, the pilot valve 218 cannot be opened well from the closed state (the operation load is large). For).
On the other hand, if a large motor with a large output is used as the electric motor, the water supply valve device becomes large and the required cost also increases.
In addition, power consumption by the electric motor is increased.

In addition, the water supply valve device in which the pilot valve in the pilot type valve unit is operated from the secondary side outflow water channel side by the operation shaft is also disclosed in the following Patent Document 2, Patent Document 3, etc. Has been.
However, those disclosed in Patent Document 2 and Patent Document 3 are different from the present invention in that the operation shaft is emergency and manual during a power failure.

JP 2007-24059 A JP 2000-283322 A JP 2000-266196 A

  The present invention is based on the circumstances as described above, and a water supply valve device that can use a small-sized electric motor with a small output and that can operate a pilot-type valve unit satisfactorily by operating an operation shaft. It was made for the purpose of providing.

  Thus, according to the first aspect of the present invention, (A) (a) a main valve that moves forward and backward toward the main valve seat and changes the opening of the main water channel, and (b) formed behind the main valve, A back pressure chamber in which the internal pressure acts on the main valve as a pressing force in the valve closing direction; and (c) water in the primary inflow water channel in the main water channel is guided to the back pressure chamber. A small introduction hole for increasing the pressure of the chamber; and (d) a passage penetrating the main valve, wherein the back pressure chamber communicates with a secondary outlet water channel in the main water channel to A pilot hole for reducing the pressure in the back pressure chamber by extracting the flow into the outflow water channel, and (e) a pilot valve that moves forward and backward toward the pilot valve seat provided in the main valve on the back pressure chamber side. A pilot-type valve section, and (B) extending from the valve body to the valve section side through the secondary effluent water passage, and on the effluent water passage side, the pilot An operation shaft that is separate from the pilot valve, and the operation of the pilot valve by the operation shaft causes the main valve to follow the forward / backward movement of the pilot valve in the same direction. In the water supply valve device that moves forward and backward and adjusts the flow rate of the main water channel, an electric motor is connected to the operation shaft so that the operation shaft is driven in the axial direction by the electric motor, and the back pressure chamber A pressure relief hole that communicates with the outflow water channel, a pressure relief valve that opens and closes the pressure relief hole on the back pressure chamber side, and a pressure relief pin that opens the pressure relief valve and has a smaller diameter than the operation shaft. The pressure release pin is inserted through the pressure release hole and protrudes toward the outflow water channel so that the pressure release pin is driven by the electric motor, and the pressure release valve is opened via the pressure release pin. Relieve the back pressure of the back pressure chamber and continue to operate the operating shaft The pilot valve is moved backward to the valve opening side.

  According to a second aspect of the present invention, in the first aspect, the pilot valve serves as the pressure relief valve, the pilot hole also serves as the pressure relief hole, and the pressure release pin is provided between the pilot valve and the operation shaft. The pilot valve is opened from the closed state by the operation shaft through the pressure release pin to perform the pressure release, and then the pilot valve is operated by the operation shaft through the pressure release pin. It is characterized in that it is made to move backward.

  According to a third aspect of the present invention, in the first aspect, the pressure relief valve is provided separately from the pilot valve, and the pressure relief hole is provided separately from the pilot hole, and the pressure relief valve is driven by the electric motor. After opening the pressure relief valve through a pin, the pilot valve is moved backward by the operation shaft.

  According to a fourth aspect of the present invention, in the third aspect, the pressure release hole is provided through the pilot valve, and the pressure release hole communicates the back pressure chamber and the outflow water channel via the pilot hole. The pressure relief valve is provided in a state of opening and closing the pressure relief hole on the back pressure chamber side, and the pressure relief pin is interposed between the pressure relief valve and the operation shaft. The pilot valve is opened by the operating shaft via the pressure release pin, and then the pilot valve in the closed state is moved backward.

  According to a fifth aspect of the present invention, in the third aspect, the pressure relief valve and the pressure relief hole are provided at positions different from the pilot valve and the pilot hole, respectively, and the pressure relief pin is interposed via the operation shaft. Without being connected to the electric motor.

Effects and effects of the invention

  As described above, according to the present invention, the electric motor is connected to the operation shaft so that the operation shaft is driven in the axial direction by the electric motor, and the pressure release hole for communicating the back pressure chamber and the outflow water channel, and the back. A pressure relief valve that opens and closes the pressure relief hole is provided on the pressure chamber side, and a small diameter pressure relief pin that opens and closes the pressure relief valve is provided in a state of being inserted through the pressure relief hole and projecting to the outflow water channel side, and this is connected to the electric motor. And the pressure relief valve in the back pressure chamber is released through the pressure release pin, and the pilot valve is moved backward to the valve opening side by the operation shaft. Is.

  In the present invention, since the pressure release pin has a small diameter with respect to the operation shaft, the pressure release hole can be formed with a small diameter corresponding to this, and therefore the pressure release pin is opened by the electric motor. This can be opened with a small force.

Thus, by opening the pressure relief valve, the sag pressure generated in the back pressure chamber can be released, and the pressure in the back pressure chamber can be reduced at a stretch.
Therefore, when the pilot valve is moved backward with the operating shaft thereafter, it can be moved backward with a small force, and the amount of water in the main water channel is increased and the flow rate is adjusted (flow control) by the backward movement of the pilot valve. Can do.
Further, as the pilot valve moves forward, the flow can be adjusted in the flow rate decreasing direction.

  In addition, since the pressure relief valve and pilot valve can be operated with a small force, it is possible to use a small-sized electric motor with a small output, so that the water supply valve device can be made compact and the required cost is low. Can be Furthermore, the power consumption by the electric motor can be kept small.

  The present invention has been made by paying attention to the fact that the pressure in the back pressure chamber can be effectively drastically reduced by removing the water in the back pressure chamber only slightly and the back pressure in the back pressure chamber can be eliminated. .

In the present invention, the pressure release valve is used as a pilot valve according to claim 2 and the pressure release hole is also used as a pilot hole, and the pressure release pin is interposed between the pilot valve and the operation shaft. Thus, the pilot valve can be opened from the closed state through the pressure release pin to perform pressure release, and then the pilot valve can be moved backward by the operation shaft.
In this case, the pressure release pin can be provided integrally with the pilot valve so as to protrude from the pilot valve to the operation shaft side.

  According to the present invention, the pressure release valve is provided separately from the pilot valve and the pressure release hole separately from the pilot hole according to claim 3, and the pressure release valve is opened via the pressure release pin. Thus, the pilot valve can be moved backward.

  In this case, the diameter of the pressure release hole is made smaller than the diameter of the introduction small hole, that is, the introduction small hole for introducing the water in the primary inflow water channel to the back pressure chamber, and the diameter of the pilot hole is made smaller than that of the introduction small hole. Can have a large pore diameter.

  This prevents the pilot valve from opening greatly and the main valve from opening due to the pressure drop in the back pressure chamber when the pressure relief valve is opened to open the pressure relief hole. Can do. Then, after that, by opening the pilot valve, the main valve can be opened after following this.

  In this case, the pressure relief hole is provided in a state where the back pressure chamber and the outflow water channel are communicated with each other through the pilot hole through the pilot valve, and the pressure relief valve is opened and closed on the back pressure chamber side. The pressure release pin is interposed between the pressure release valve and the operation shaft, and the pressure release valve is opened via the pressure release pin by the operation shaft and then directly operated with or without the pressure release pin. The pilot valve can be moved backward on the shaft (claim 4).

  In this way, although the pressure relief valve is provided separately from the pilot valve, the pressure relief valve and the pilot valve can be moved and operated by the same operation shaft.

  On the other hand, according to the fifth aspect, the pressure relief valve and the pressure relief hole are provided at positions different from the pilot valve and the pilot hole, and the pressure relief pin can be connected to the electric motor without using the operation shaft. Claim 5).

In this way, there is an advantage that the structure around the pilot valve is not complicated as in the case where the pressure relief valve, the pressure relief hole, and the pressure relief pin are provided at the same position as the pilot valve and the pilot hole.
In this aspect, the pressure relief valve is once opened to release the back pressure chamber and then closed, and the pilot valve is operated on the operation shaft under the pressure release valve closed state. It can be made to move forward and backward.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a faucet, and 12 is a water discharge pipe in the faucet 10.
The water discharge pipe 12 is provided in a form that stands up from a mounting surface (not shown) such as a counter upper surface.
Here, the water discharge pipe 12 has an inverted U-shaped gooseneck shape as a whole, and a water discharge port 14 is provided at the tip thereof.
Further, the water discharge pipe 12 includes a rotary dial operating unit 16 for adjusting the flow rate of the water discharge and water discharge, and an infrared sensor on the downwardly-shaped part that is lowered downward from the top to the front end and on the upper surface of the front end. 18 is provided.

Here, the dial operation unit 16 is configured as an electrical operation unit, and when the dial operation unit 16 is rotated, the rotation position detection sensor detects this and generates a signal corresponding to the rotation position. Then, the signal is sent to the control unit 28 described later.
The sensor 18 emits infrared rays from the light emitting unit, and receives light reflected by the human body at the light receiving unit to detect the human body.

Reference numeral 22 denotes a water supply channel, and the water supply valve device 24 of this embodiment is provided on the water supply channel 22.
Reference numeral 26 denotes a stepping motor (electric motor) serving as a drive unit thereof, which is electrically connected to the control unit 28 in the water supply valve device 24.
The control unit 28 is also electrically connected to the dial operation unit 16 (specifically, a rotational position detection sensor that detects the rotational position). Further, the sensor 18 is electrically connected to the control unit 28.

2 and 3 show a specific configuration of the water supply valve device 24. FIG.
In the figure, reference numeral 30 denotes a valve body, which has an upper and lower divided structure of divided bodies 30-1, 30-2, 30-3 and 30-4.
The valve body 30 is provided with a primary inflow water channel 32 and a secondary outflow water channel 34, and a pilot type on the main water channel formed by the inflow water channel 32 and the outflow water channel 34. A valve portion is provided.

Reference numeral 36 denotes a main valve comprising a diaphragm valve in the pilot type valve portion. The main valve 36 includes a hard main valve body 38 and a rubber diaphragm held thereby, as shown in FIG. It consists of a membrane 40.
The main valve 36 moves forward and backward toward the main valve seat 42 to open and close the main water channel and change the opening.

Specifically, the main valve 36 shuts off the main water passage by being seated on the main valve seat 42, and opens the main water passage by being spaced upward from the main valve seat 42 in the figure.
Further, the opening degree of the main water channel is changed depending on the distance from the main valve seat 42 to adjust the flow rate of the water flowing through the main water channel.

A back pressure chamber 44 is provided on the upper side of the main valve 36 in the figure, that is, on the side opposite to the outflow water passage 34 with respect to the main valve 36.
The back pressure chamber 44 causes the internal pressure to act on the main valve 36 as a pressing force in the downward valve closing direction in the figure.
The main valve 36 is provided with an introduction small hole 46 that passes through the main valve 36 and allows the primary inflow water passage 32 and the back pressure chamber 44 to communicate with each other.
The introduction small hole 46 leads the water from the inflow water channel 32 to the back pressure chamber 44 and increases the pressure of the back pressure chamber 44.

The main valve 36 is also provided with a pilot hole 48 as a water drainage channel that passes through the main valve 36 and communicates the back pressure chamber 44 and the secondary outflow water channel 34.
The pilot hole 48 draws water in the back pressure chamber 44 into the outflow water channel 34 and reduces the pressure in the back pressure chamber 44.

45 is a pilot valve comprising a plunger valve in the pilot type valve portion, and a seal member 47 made of an elastic material such as rubber is provided below the pilot valve.
The pilot valve 45 moves back and forth in the vertical direction in the drawing, that is, in the vertical direction (axial direction) in the drawing with respect to the pilot valve seat 50 provided in the main valve 36, thereby changing the opening degree of the pilot hole 48.

Specifically, when the pilot valve 45 is seated on the pilot valve seat 50, the pilot hole 48 is closed, and when the pilot valve 45 is separated from the pilot valve seat 50 upward in the figure, the pilot hole 48 is opened.
Further, the opening degree of the pilot hole 48 is changed in accordance with the amount of separation of the pilot valve 45 from the pilot valve seat 50.

However, in this embodiment, when the pilot valve 45 actually moves back and forth in the vertical direction in the figure, the main valve 36 follows the pilot valve 45 and moves back and forth in the vertical direction in the figure.
At this time, the main valve 36 moves back and forth in the same direction following the forward / backward movement of the pilot valve 45 while maintaining a constant minute follow-up gap between the pilot valve seat 50 and the pilot valve 45.

Specifically, as shown in FIG. 5 (II), when the pilot valve 45 moves backward in the figure, the amount of water that flows from the back pressure chamber 44 through the pilot hole 48 to the outflow water channel 34 increases. The pressure in the back pressure chamber 44 decreases.
Then, the main valve 36 moves backward in accordance with the backward movement of the pilot valve 45 so that the pressure of the back pressure chamber 44 and the pressure of the inflow water passage 32 are balanced, and the main water passage is opened with a large opening. The amount of water flowing from the water channel 32 to the outflow water channel 34 is increased (FIG. 5 (II)).

  The main valve 36 moves in the same direction following the further backward movement of the pilot valve 45 while maintaining a constant gap between the pilot valve seat 50 and the pilot valve 45, and further increases the opening of the main water channel. Thus, the flow rate of water in the main water channel is increased and changed (FIG. 5 (III)).

Conversely, when the pilot valve 45 moves forward downward in the figure, the main valve 36 is adjusted so that the pressure in the back pressure chamber 44 and the pressure in the inflow water channel 32 are balanced as shown in FIG. 6 (I). Following the forward movement of 45, it moves downward in the figure, and the opening of the main water channel is decreased to change the flow rate of water in the main water channel (FIG. 6 (II)).
Finally, the main valve 36 and the pilot valve 45 are seated on the main valve seat 42 and the pilot valve seat 50, and the respective valves are closed (FIG. 6 (III)).

As shown in FIG. 3, the main valve main body 38 of the main valve 36 is integrally provided with a cylindrical guide portion 51 in an upright state, and the pilot portion 45 is provided by the guide portion 51. Guidance is provided when moving forward and backward.
A metal coil spring 52 is interposed between the pilot valve 45 and the divided body 30-4, and the pilot valve 45 is urged downward in the figure, that is, in the valve closing direction by the coil spring 52. Yes.

As shown in FIG. 3, in this embodiment, a pressure release pin 54 having a small diameter with respect to an operation shaft 56 to be described later protrudes downward from the pilot valve 45 in the figure. The hole 48 is inserted.
In this embodiment, the pilot valve 45 also serves as a pressure relief valve, and the pilot hole 48 also serves as a pressure relief hole.
The operation shaft 56 is not inserted into the pilot hole 48 also serving as the pressure release hole, and the pilot hole 48 is formed with a diameter corresponding to the pressure release pin 54 and smaller than the operation shaft 56.

  In FIG. 3, reference numeral 56 denotes an operation shaft that is coaxially arranged opposite to the pilot valve 45 in the vertical direction in the figure, and this operation shaft 56 passes from the valve body 30 through the outflow water channel 34 on the secondary side to the above-described operation shaft 56. The main valve 36 is operated via a pilot valve 45 on the outflow water channel 34 side.

A stepping motor 26 is connected to the operation shaft 56 as shown in FIG. 2, and the operation shaft 56 is driven by the stepping motor 26.
In FIG. 2, reference numeral 60 denotes an output shaft of the stepping motor 26, and a cam member 62 is assembled to the output shaft 60 in an integrally rotating state.
The cam member 62 has a cylindrical shape, and has an insertion hole 64 in the center as shown in FIG. 4, and the output shaft 60 is inserted upwardly there.

As shown in detail in FIG. 4, the output shaft 60 and the insertion hole 64 of the cam member 62 are formed with flat engagement surfaces 66 and 68 having a cut-off shape, respectively. The holes 64 are engaged with each other at the engaging surfaces 66 and 68.
The cam member 62 rotates integrally with the output shaft 60 by their engaging action.
Here, the upper surface of the cam member 62 is a cam surface 70 having a partial spiral shape that shifts upward as it moves counterclockwise in the drawing along the circumferential direction.

On the other hand, a driven cap 72 that moves following the rotation of the cam member 62 is attached to the lower end of the operation shaft 56.
An insertion hole 76 is formed at the center of the driven cap 72, and the operating shaft 56 is inserted into the insertion hole 76 by press-fitting.

The driven cap 72 is provided with a protrusion 74 protruding downward, and the protrusion 74 is brought into contact with the cam surface 70 on the upper surface of the cam member 62 downward in the drawing.
Accordingly, when the output shaft 60 of the stepping motor 26 rotates and the cam member 62 rotates integrally therewith, the operation shaft 56 is driven in the vertical direction by the cam action of the cam surface 70, and the main valve 36 is connected via the pilot valve 45. To work.

As shown in FIG. 2, the valve body 30, specifically, the divided body 30-2, has a recess 77 at its center, and the driven cap 72 slides up and down below the recess 77. It is movably inserted.
On the other hand, a grease cap 78 is fitted into the upper portion of the recess 77. A grease reservoir is formed inside the grease cap 78, and grease is held therein.

  A metal coil spring 80 is interposed between the grease cap 78 and the driven cap 72, and the driven cap 72 is urged downward in the figure by the coil spring 80. That is, the operating shaft 56 is urged downward in the figure by the coil spring 80.

The operation shaft 56 protrudes from the recess 77 of the divided body 30-2 through the through hole 82 of the divided body 30-3 to the outlet water channel 34 on the secondary side.
Further, as shown in FIG. 3, a part of the through hole 82 is formed into an annular housing recess 84 in the divided body 30-3, and a rubber O-ring 86 having elasticity as an annular seal member there. Is housed.
The O-ring 86 provides a watertight seal between the operating shaft 56 and the valve body 30, more specifically between the divided body 30-3.

In this embodiment, as shown in FIGS. 2 and 3, with the main valve 36 and the pilot valve 45 closed, the operating shaft 56 is moved upward in the figure by the stepping motor 26, and the operating shaft 56 is depressurized. By slightly abutting the pilot valve 45 in contact with the pin 54, the rolling pressure generated in the back pressure chamber 44 can be released.
At this time, by slightly removing the water in the back pressure chamber 44 toward the outflow water channel 34 side, the back pressure chamber 44 is released as shown in FIG. It can be drastically lowered greatly.

The operation shaft 56 is continuously pushed upward in the figure by the stepping motor 26, whereby the pilot valve 45 is moved backward in the figure via the pressure release pin 54, whereby the main valve 36 follows the pilot valve 45. Then, it moves backward in the same direction and increases the flow rate of the water flowing through the main water channel by increasing its opening.
That is, the flow rate of water in the main water channel is adjusted to the increase side.

Further, when the operating shaft 56 is moved downward in the figure, the pilot valve 45 moves forward in the figure downward, and the main valve 36 moves forward downward in the figure following this, and the opening degree thereof is decreased. .
And thereby, the flow volume of the water which flows through the main channel is decreased.

As described above, in the present embodiment, the punching pressure generated in the back pressure chamber 44 can be released by slightly pushing up the pressure release pin 54 with the operation shaft 56, and the pressure in the back pressure chamber 44 is reduced at a stretch. be able to.
Further, in this embodiment, since the hole diameter of the pilot hole 48 is made as small as possible, the pilot valve 45 can be moved backward with a small force when the pilot valve 45 is moved backward by the operation shaft 56 thereafter. The amount of water in the main water channel can be adjusted (flow adjusted) by the backward movement of the pilot valve 45.
Further, as the pilot valve 45 moves forward, the flow can be adjusted in the flow rate decreasing direction.

  In the present embodiment, since the pilot valve 45 can be operated with a small force, it is possible to use a small stepping motor 26 with a small output, so that the water supply valve device 24 can be configured compactly. The required cost can be reduced. Furthermore, the power consumption by the stepping motor 26 can be kept small.

Next, FIG. 7 shows another embodiment of the present invention.
In this example, a pressure relief hole 88 that penetrates the bottom of the pilot valve 45 and connects the back pressure chamber 44 and the outflow water channel 34 via the pilot hole 48 is provided, and the inside of the cylindrical portion 90 of the pilot valve 45 is provided. The pressure relief valve 92 for opening and closing the pressure relief hole 88 is provided, and this is urged downward in the figure by a metal coil spring 94, that is, in the valve closing direction, and the pressure relief valve 92 is provided for the pilot valve 45. This is an example in which the valve seat 100 is seated.
A cap 96 is screwed onto the pilot valve 45, and the coil spring 94 is interposed between the cap 96 and the pressure relief valve 92.

From the pressure relief valve 92, a pressure relief pin 54 having a small diameter with respect to the operation shaft 56 protrudes downward in the figure, and the pressure relief pin 54 passes through a pressure relief hole 88 formed in the pilot valve 45 to operate the pressure relief pin 54. The shaft 56 is opposed to the shaft 56 in the axial direction.
A projecting portion 98 rises downward from the cap 96, and the projecting portion 98 is opposed to the pressure relief valve 92.
In this embodiment, the hole diameter X of the press-out hole 88 is made smaller than the hole diameter Y of the introduction small hole 46, and the hole diameter Z of the pilot hole 48 is made larger than the hole diameter Y of the introduction small hole 46. Has been.

  In this embodiment, as shown in FIG. 8 (I), when the operation shaft 56 is pushed upward by the stepping motor 26 in the figure, the operation shaft 56 first comes into contact with the pressure release pin 54 and the pressure release valve 92 is slightly changed. To rise. At this time, the rolling pressure generated in the back pressure chamber 44 is eliminated (the inside of the cylindrical portion 90 communicates with the back pressure chamber 44 through the communication hole).

The operation shaft 56 subsequently pushes up the pressure release pin 54 upward to push the pilot valve 45 upward from the closed state by the contact action between the pressure release valve 92 and the protruding portion 98, and the pilot valve 45 is Open the valve.
Thereafter, the operating shaft 56 further moves the pilot valve 45 backward in the drawing, and the main valve 36 moves backward in accordance with this, thereby gradually increasing the opening degree (FIG. 8 (II)).

  In this embodiment, even if the pressure relief valve 92 is opened by the operation shaft 56, the pilot valve 45 does not immediately open from the closed state (FIG. 8 (I)). Is applied to the pilot valve 45 via the pressure release pin 54 and the protruding portion 98, so that the pilot valve 45 is opened from the closed state for the first time.

  Also in the present embodiment, by opening the pressure release valve 92 and opening the pressure release hole 88, it is possible to eliminate the pressure of the back pressure chamber 44, and then the pilot valve 45 is opened with a small force. Following this, the main valve 36 can be opened.

  In this embodiment, although the pressure relief valve 92 is provided separately from the pilot valve 45, the pressure relief valve 92 and the pilot valve 45 can be moved and operated by the same operation shaft 56.

FIG. 9 shows still another embodiment of the present invention.
In this example, a pressure release chamber 106 communicating with the back pressure chamber 44 through the communication passage 104 is provided in the valve body 30 at a position apart from the pilot valve 45, and the pressure release valve 92 is accommodated therein. This pressure relief valve 92 opens and closes the pressure relief hole 88.
Here, the pressure release hole 88 allows the back pressure chamber 44 and the outflow water channel 34 to communicate with each other via the communication passage 104 and the pressure release chamber 106.
In this embodiment, the communication passage 104 and the pressure release chamber 106 can also be considered to form part of the pressure release hole 88.

From the pressure release valve 92, a pressure release pin 54 protrudes long downward in the figure, and the pressure release pin 54 is connected to the stepping motor 26 via the cam member 62 described above.
Here, the cam member 62 is provided with a cam portion 107 for the pressure relief valve 92, and a cam surface 108 for moving the pressure relief pin 54 in the vertical direction in the figure is formed on the cam portion 107. .

Here, the cam surface 108 opens the pressure relief valve 92 immediately before the pilot valve 45 is opened by the operation shaft 56.
Further, the cam surface 108 is configured so that the pressure relief valve 92 is opened after the operation valve 56 opens the pilot valve 45 after the pressure relief valve 92 is opened as shown in FIGS. The shape is determined so as to close the valve again.

  Note that a pin 110 having a diameter smaller than that of the operation shaft 56 protrudes downward from the pilot valve 45 in the drawing and is opposed to the operation shaft 56. In this embodiment, however, the pin 110 serves as a pressure release pin. Does not work.

  However, the operation shaft 56 moves the pilot valve 45 through the pin 110. Therefore, the hole diameter of the pilot hole 48 is smaller than that of the operation shaft 56, so that the pressure in the back pressure chamber 44 is released. After the operation, the operation resistance when the pilot valve 45 is opened by the operation shaft 56 is also reduced.

  In the present embodiment, the structure around the pilot valve 45 is not complicated as in the case where the pressure relief valve 92 and the pressure relief hole 88 and the pressure relief pin 54 are provided at the same position as the pilot valve 45 and the pilot hole 48. Benefits are gained.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the above-described pressure release pin can be separated from the pressure release valve and can be interposed between the pressure release valve and the operating shaft or the cam member. It can be configured with various modifications.

1 is a schematic overall view of a faucet having a water supply valve device according to an embodiment of the present invention. It is front sectional drawing which shows the water supply valve apparatus of the embodiment. It is a principal part enlarged view of the water supply valve apparatus of FIG. It is a perspective view which decomposes | disassembles into each component and shows the transmission mechanism of the driving force in the embodiment. It is operation | movement explanatory drawing of the embodiment. FIG. 6 is an operation explanatory diagram following FIG. 5. It is a figure of other embodiment of this invention. It is operation | movement explanatory drawing of 2nd Embodiment. It is a figure of other embodiment of this invention. FIG. 10 is an operation explanatory diagram of the embodiment of FIG. 9. It is a figure which shows an example of the conventional water supply valve apparatus.

Explanation of symbols

24 Water supply valve device 26 Stepping motor (electric motor)
30 Valve body 32 Inflow water channel 34 Outflow water channel 36 Main valve 42 Main valve seat 44 Back pressure chamber 45 Pilot valve (pressure relief valve)
46 Introduction small hole 48 Pilot hole (pressure release hole)
50 Pilot valve seat 54 Pressure relief hole 56 Operating shaft 88 Pressure relief hole 92 Pressure relief valve

Claims (5)

(A) (a) a main valve that moves forward and backward toward the main valve seat and changes the opening of the main water channel; and (b) an internal pressure that is formed behind the main valve and A back pressure chamber that acts as a pressing force in the valve closing direction, and (c) an introduction small hole that guides water in the primary inflow water channel in the main water channel to the back pressure chamber to increase the pressure in the back pressure chamber. (D) provided through the main valve, communicating the back pressure chamber and a secondary outflow water channel in the main water channel to draw water from the back pressure chamber into the outflow water channel; A pilot-type valve portion having a pilot hole for reducing the pressure of the chamber, and (e) a pilot valve that moves forward and backward toward the pilot valve seat provided in the main valve on the back pressure chamber side, and (B ) The valve body extends from the valve body to the valve portion side through the secondary effluent channel, and the pilot valve is moved forward and backward on the effluent channel side. An operating shaft that is separate from the lot valve, and the main valve is moved forward and backward in the same direction following the forward and backward movement of the pilot valve by an operation of moving the pilot valve forward and backward by the operating shaft. In the water supply valve device that adjusts the flow rate of the water channel,
An electric motor is connected to the operation shaft so that the operation shaft is driven in the axial direction by the electric motor,
A pressure relief hole for communicating the back pressure chamber and the outflow water channel, a pressure relief valve for opening and closing the pressure relief hole on the back pressure chamber side, and a pressure relief having a smaller diameter than the operation shaft for opening the pressure relief valve. A pin is provided, the pressure release pin is inserted through the pressure release hole and protrudes toward the outflow water channel, and the pressure release pin is driven by the electric motor, and the pressure release valve is connected via the pressure release pin. A water supply valve device characterized by opening the valve to release the squeezing pressure in the back pressure chamber, and subsequently moving the pilot valve back to the valve opening side by the operation shaft.   The pilot valve according to claim 1, wherein the pilot valve serves as the pressure relief valve, the pilot hole also serves as the pressure relief hole, and the pressure relief pin is interposed between the pilot valve and the operation shaft. The pilot valve is opened from the closed state via the pressure release pin on the shaft to perform the pressure release, and then the pilot valve is moved backward on the operation shaft via the pressure release pin. A water supply valve device characterized by that.   2. The pressure release valve according to claim 1, wherein the pressure release valve is provided separately from the pilot valve, and the pressure release hole is provided separately from the pilot hole, and the pressure release valve is driven via the pressure release pin by the electric motor. A water supply valve device, wherein the pilot valve is moved backward by the operation shaft after being opened.   In Claim 3, the pressure relief hole is provided through the pilot valve, and the pressure relief hole communicates the back pressure chamber and the outflow water channel via the pilot hole. The pressure relief valve is provided in a state of opening and closing the pressure relief hole on the back pressure chamber side, and the pressure relief pin is interposed between the pressure relief valve and the operation shaft. A water supply valve device, wherein the pilot valve in a closed state is moved backward after the pressure release valve is opened through a pressure release pin.   4. The pressure release valve and the pressure release hole according to claim 3, wherein the pressure release pin and the pilot hole are provided at positions different from each other, and the pressure release pin is connected to the electric motor without the operation shaft. A water supply valve device characterized by that.

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