JP2006258272A - Faucet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a faucet not making the operation of the faucet heavy by excessive operation force from a rotation operation part. <P>SOLUTION: In the faucet 10, a drive shaft 34 for driving valve elements 28, 16 is axially advanced/retreated by the rotation operation force applied from a handle 48 to perform adjustment of flow rate. When the valve elements 28, 16 are in the opened state and resistance of advancement/retreating movement of the drive shaft 34 is small, the drive shaft 34 are advanced/retreated by the rotation operation force from the handle 48 while maintaining the interlocking state of the handle 48 and the drive shaft 34. Whereas, when resistance to advancement of the drive shaft 34 becomes larger than the set value by opening of the valve elements 28, 16, a clutch spring 52 for shutting off the interlocking state and idling the handle 48 is interposed between the handle 48 and the drive shaft 34. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a faucet that adjusts the flow rate by rotating a drive shaft that drives a valve body by a rotational operation force applied from a rotary operation unit to advance and retreat in the axial direction, and in particular to lighten the operation by the rotary operation unit. It is related with what has the characteristics in the technical means.

  Conventionally, various types of faucets have been used. However, these faucets have to close the main valve against (or against) a large water supply pressure, and a large force is required for the operation. There was a problem that needed.

FIG. 10 shows a representative example (here, a single water faucet).
In the figure, reference numeral 200 denotes a faucet housing, in which a primary inflow water passage 202 is formed for allowing water to flow in based on the supply water pressure.
The inflow water channel 202 is formed to communicate with the inner peripheral side of the annular valve seat 204, and from the outer peripheral side of the valve seat 204 toward the water discharge port (water discharge portion) 206, A secondary-side outflow water channel 208 that constitutes the main water channel along with the inflow water channel 202 extends.
In the figure, 202A represents the end of the inflow water channel 202.

  Reference numeral 210 denotes a coma main valve element. The coma main valve element 210 is opposed to the flow of water from the inflow water channel 202, that is, is opposed to the flow of water from the inflow water channel 202. Advances downward in the figure. Then, the valve seat 204 is seated and closed at the forward end (the valve seat 211 made of an elastic material such as rubber hits the valve seat 204 at this time), and the inflow water passage 202 and the outflow water passage 208 are blocked.

Reference numeral 212 denotes a drive shaft (spindle shaft) that drives the main valve 210 downward in the figure. The drive shaft 212 is inserted into a female screw hole 214 formed in the faucet housing 200 from the outside of the faucet housing 200 and is large. The external thread portion 218 formed on the outer peripheral portion of the diameter portion 216 is screwed into the internal thread hole 214 and is held by the faucet housing 200 so as to be movable in the vertical direction, that is, in the axial direction in the figure by screw feed.
A handle (rotation operation unit) 219 is coupled to the upper end of the drive shaft 212 in an integrally rotated state.

  In the faucet of FIG. 10, the main valve 210 is directed downward in the opposite direction while receiving the flow of water from the end portion 202A of the inflow water channel 202 on almost the entire surface (lower surface) including the central portion of the main valve 210. Therefore, a strong operating force is required for the valve closing operation, and the operation is heavy.

In addition, since the handle 219 is operated with a strong force to stop the flow of water, the valve seat 211 tends to be compressed and deformed and the handle 219 is strongly tightened, and a strong force is required when performing the valve opening operation thereafter. End up.
For this reason, the operation structure is enlarged, which causes a problem that the faucet itself is enlarged.

  In view of this, the present applicant, in a previous patent application (Japanese Patent Application No. 2004-272495: unpublished), uses a valve mechanism in the single water faucet as a pilot-type valve mechanism. Specifically, the main valve is moved by moving the pilot valve body. It has been proposed to adjust the flow rate (including opening and closing of the flow path) by following the displacement and adjusting the opening.

FIG. 11 shows a specific example thereof.
In the figure, reference numeral 210 denotes a main valve element made of a piston type valve, and a back pressure chamber 220 is formed on the opposite side of the main valve element 210 from the end portion 202A of the inflow water channel 202. The back pressure chamber 220 causes the internal pressure to act on the main valve body 210 as a pressing force in the valve closing direction.

The main valve body 210 is provided with a water guide hole 222 and a pilot water channel 224 as a drainage water channel so as to penetrate the main valve body 210.
Here, the water introduction hole 222 causes the end portion 202 </ b> A of the inflow water passage 202 to communicate with the back pressure chamber 220 and guides the water in the inflow water passage 202 to the back pressure chamber 220 to increase the pressure in the back pressure chamber 220.

  On the other hand, the pilot water channel 224 allows the back pressure chamber 220 and the outflow water channel 208 to communicate with each other, draws water from the back pressure chamber 220 to the outflow water channel 208 side, and reduces the pressure in the back pressure chamber 220.

Reference numeral 226 denotes a cylindrical pilot valve body made of an elastic material such as rubber, and is fitted to a small-diameter and rod-shaped protrusion 228 at the end of the drive shaft 212.
This pilot valve body 226 moves forward and backward in the figure integrally with the drive shaft 212, thereby changing the opening degree of the pilot water channel 224.
In addition, in the partial enlarged view of FIG. 11, 230 is a pilot valve seat on which the pilot valve body 226 is seated.

  In the case of the single water faucet shown in FIG. 11 incorporating such a pilot type valve mechanism, the main water passage is closed as shown in FIG. 11, that is, the main valve body 210 is seated on the main valve seat 204, and the pilot valve When the handle 219 is rotated from the state where the body 226 is seated on the pilot valve seat 230 and the pilot valve body 226 is moved backward together with the drive shaft 212 in the figure, the space between the pilot valve seat 230 and the pilot valve body 226 is increased. In other words, the pilot water channel 224 is opened, and the water in the back pressure chamber 220 is extracted through the pilot water channel 224 to the outflow water channel 208 side.

When the water in the back pressure chamber 220 is extracted in this way, the pressure in the back pressure chamber 220 decreases, and the main valve body 210 is configured so that the pressure in the back pressure chamber 220 and the pressure in the inflow water passage 202 are balanced. Slightly moves upward in the figure, and the main valve body 210 stops when the pressures are balanced.
At this time, when the main valve body 210 is separated upward from the main valve seat 204 in the figure, a gap corresponding to the amount of separation (lift-up amount) is generated between the main valve body 210 and the main valve seat 204. Then, water flows from the inflow water channel 202 to the outflow water channel 208 side, and water is discharged from the water discharge port 206.

  When the pilot valve body 226 further moves backward in the figure together with the drive shaft 212 from this state, the main valve body 210 moves backward in the figure so as to follow this, and the opening of the main water channel is further increased. Thus, the flow rate of water from the inflow water channel 202 to the outflow water channel 208, that is, the water discharge amount from the water discharge port 206 is increased.

Further, when the pilot valve body 226 is moved forward together with the drive shaft 212 by rotating the one handle 219 in the reverse direction, the main valve body 210 moves forward downward in the figure because the pressure in the back pressure chamber 220 increases. Then, the gap between the main valve body 210 and the main valve seat 204 is reduced to reduce the flow rate, and the amount of water discharged from the water outlet 206 is reduced.
When the pilot valve body 226 is further moved downward by operating the handle 219, the flow rate of water further decreases, and the main valve body 210 and the pilot valve body 226 are closed, that is, In a state where the main valve body 210 is seated on the main valve seat 204 and the pilot valve body 226 is seated on the pilot valve seat 230, the main water passage is blocked and water discharge from the water discharge port 206 is stopped.

In the case of the single water faucet shown in FIG. 11, the main valve body 210 is moved in accordance with the increase / decrease control of the pressure in the back pressure chamber 220 by the forward / backward movement of the pilot valve body 226, thereby changing the opening of the main water channel. Therefore, the flow rate can be adjusted with a light operating force.
However, even in the faucet shown in FIG. 11, if the handle 219 is strongly tightened when the water stops, that is, when the valve is closed, the valve seat 211 in the main valve body 210 and the pilot valve body 226 made of an elastic material are elastic. When the handle 219 is operated in the valve opening direction in order to start the water discharge again after being compressed and deformed, there is a problem that the operation resistance is high at the initial stage of the operation, and a strong force is required and the operation becomes heavy.

  In the above, a single water faucet incorporating a pilot type valve mechanism with a piston type valve body as a main valve body has been described as an example, but such a problem is caused by a similar pilot type valve mechanism having a diaphragm type valve body as a main valve body. This is a problem that may occur in a single faucet incorporating a built-in single faucet or other various types of pilot-type valve mechanisms, or in various forms of faucets other than such a single faucet, and such a pilot-type valve mechanism. Rather, it is a problem that may occur also in various faucets other than the single faucet of the form shown in FIG. 10 in which the main valve body is directly displaced by the drive shaft to adjust the flow rate.

  In addition, although the following patent document 1 discloses an invention about a controller that prevents the diaphragm from being damaged due to overtightening of the handle, this controller is not a faucet but a high-purity gas. The present invention relates to a controller for eliminating leakage of gas in a pipe line, which is different from the present invention, and prevents a diaphragm from being damaged due to overtightening of a handle by a stopper mechanism. This is different from the present invention.

Japanese Patent Laid-Open No. 5-80858

  The present invention has been made for the purpose of providing a faucet that does not increase the operation of the faucet due to an excessive rotational operation force from the rotational operation unit.

  Thus, according to the first aspect of the present invention, in the water faucet that adjusts the flow rate by rotating the drive shaft that drives the valve body by the rotational operation force applied from the rotational operation unit to advance and retract in the axial direction, the valve A clutch mechanism that shuts off the interlocking state between the rotation operation unit and the drive shaft and idles the rotation operation unit when the resistance to advancing of the drive shaft becomes greater than a set value due to the valve closing of the body. It is characterized in that it is interposed between the rotary operation unit and the drive shaft.

  The present invention comprises (a) a main valve body that changes the opening of the main water channel, and (b) a back pressure chamber that acts on the main valve body as a pressing force in the valve closing direction. (C) a water introduction hole composed of a small hole for guiding the 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; and (d) the water in the back pressure chamber. In a pilot type valve mechanism having a pilot water channel that reduces the pressure in the back pressure chamber by pulling out a secondary outflow water channel in the main water channel, and (e) a pilot valve body that changes an opening degree of the pilot water channel The pilot valve body is configured to be displaced by a forward / backward movement of the drive shaft.

Effects and effects of the invention

  As described above, according to the present invention, when the valve body is in the valve open state and the resistance of the forward / backward movement of the drive shaft is small, the rotation operation unit and the drive shaft maintain the interlocked state and rotate from the rotation operation unit. A clutch mechanism that moves the drive shaft forward and backward by operating force, and shuts off the interlocking state and idles the rotary operation unit when the resistance to advance of the drive shaft becomes larger than the set value due to valve closing. According to the present invention, an increase in the operating resistance due to excessive pushing of the valve body with respect to the valve seat is avoided, and the driving shaft is always moved forward and backward with a light operation. The valve body can be displaced.

  The present invention particularly incorporates a light-operated faucet, more specifically, a main valve body that opens and closes a main water channel, a back pressure chamber, a water introduction hole, a pilot water channel and a pilot valve mechanism that includes a pilot valve body that opens and closes the pilot water channel. It is particularly suitable when applied to a faucet (claim 2).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a faucet of this embodiment, 12 and 14 are an inflow water channel and an outflow water channel constituting the main water channel, and 16 is a diaphragm type main valve body provided on the main water channel.
Here, the main valve body 16 opens and closes the main water passage by being seated on and separated from the main valve seat 18, that is, the communication between the inflow water passage 12 and the outflow water passage 14 is blocked, and the amount of separation from the main valve seat 18. Accordingly, the opening of the main water channel is changed, and the flow rate of water from the inflow water channel 12 to the outflow water channel 14 is changed.
Here, the main valve body 16 specifically seals the valve seat 20 made of rubber in the diaphragm on the valve seat 18 when the valve is closed.

A back pressure chamber 22 is formed above the main valve body 16, that is, on the opposite side of the main valve body 16 from the starting end portion of the outflow water passage 14.
The back pressure chamber 22 causes the internal pressure to act on the main valve body 16 as a pressing force in the valve closing direction.
The main valve body 16 is provided with a water guide hole 24 composed of a small hole penetrating the main valve body 16 and a pilot water channel 26 as a water drain channel.
Here, the water introduction hole 24 causes the inflow water passage 12 and the back pressure chamber 22 to communicate with each other to allow water to flow from the inflow water passage 12 into the back pressure chamber 22, thereby increasing the pressure in the back pressure chamber 22.
On the other hand, the pilot water channel 26 as a drainage water channel draws the water in the back pressure chamber 22 to the outflow water channel 14 and reduces the pressure in the back pressure chamber 22.

Reference numeral 28 denotes a pilot valve body in a pilot type valve mechanism, and the pilot water passage 26 is opened and closed and its opening degree is changed by the forward / backward movement of the pilot valve body 28 in the axial direction, that is, the forward / backward movement in the vertical direction in the figure.
Here, the pilot valve body 28 closes the pilot water passage 26 by seating the valve seat 30 made of an elastic material such as rubber on the pilot valve seat 32, and is spaced apart from the pilot valve seat 32 upward in the figure. The water channel 26 is opened. Furthermore, the opening degree of the pilot water channel 26 is changed in accordance with the distance (lift-up amount) from the pilot valve seat 32.

  In this pilot type valve mechanism, the main water passage is shut off in the state shown in FIG. 1, that is, the pilot valve body 28 is seated on the pilot valve seat 32, and the main valve body 16 is seated on the main valve seat 18. Distribution stops.

  In this state, when the pilot valve body 28 is spaced upward from the pilot valve seat 32 in the drawing as shown in FIG. The water in the chamber 22 is extracted to the outflow water channel 14 side through the pilot water channel 26, and the pressure in the back pressure chamber 22 decreases.

Then, the pressure of the inflow water channel 12 overcomes the pressure of the back pressure chamber 22, and the main valve body 16 is raised upward, that is, moved backward in the figure as shown in FIG. The main valve body 16 stops at a position where the pressure of the water and the pressure of the inflow water channel 12 are just balanced.
At this time, a gap is formed between the main valve body 16 and the main valve seat 18, and water flows from the inflow water channel 12 to the outflow water channel 14 through the gap.

  When the pilot valve body 28 further moves upward in the figure from this state, the main valve body 16 follows the backward movement of the pilot valve body 28 so as to balance the pressure of the back pressure chamber 22 and the pressure of the inflow water passage 12. Then, it moves backward in the figure, and further widens the opening in the main water channel to increase the flow rate of water (FIG. 4 (III)).

  On the other hand, when the pilot valve body 28 that has moved back upward moves forward downward in the figure and the gap between the pilot valve body 28 and the pilot valve seat 32 becomes smaller (FIG. 5 (I)), the back pressure chamber 22 is here. Pressure rises and overcomes the pressure of the inflow water channel 12, whereby the main valve body 16 moves forward downward in the drawing so as to balance those pressures, and the clearance with the main valve seat 18 is reduced. (FIG. 5 (II)). That is, the flow rate of water from the inflow water channel 12 to the outflow water channel 14 side is decreased.

When the pilot valve body 28 further moves downward in the figure from this state, the main valve body 16 moves forward downward in the figure following this, further reducing the flow rate of water (FIG. 5 (III)).
The pilot valve body 28 is seated on the pilot valve seat 32 formed on the main valve body 16, and the main valve body 16 is seated on the main valve seat 18, whereby the inflow water passage 12 and the outflow water passage 14 are blocked. In this state, the flow of water from the inflow water channel 12 to the outflow water channel 14 is stopped here.

1 and 2, reference numeral 34 denotes a drive shaft (spindle shaft) for driving the main valve body 16 via the pilot valve body 28, and the pilot valve body 28 is provided at the lower end thereof.
An annular groove is formed on the outer peripheral surface of the drive shaft 34, and an O-ring 36 for sealing is attached thereto.
An upper portion of the drive shaft 34 is a large diameter portion 38, and a male screw portion 40 is formed on the outer peripheral surface thereof.
The male screw portion 40 is screwed into a female screw portion 46 formed on the inner peripheral surface of the cylindrical portion 44 of the body 42 in the faucet 10.

The drive shaft 34 is rotated by a handle (rotation operation unit) 48 described later, so that the drive shaft 34 moves forward and backward in the vertical direction in the drawing, that is, in the axial direction by the screw feeding action of the male screw portion 40 and the female screw portion 46.
The handle 48 has a circular recess 50 facing downward in the figure at the center thereof, and a clutch spring that forms a clutch mechanism straddling the recess 50 and a recess inside the cylindrical portion 44 of the body 42. 52 is interposed. That is, the clutch spring 52 is interposed across the handle 48 and the drive shaft 34.

Here, the clutch spring 52 is formed of a coil spring, and the lower end in the figure is fixed to the drive shaft 34. Specifically, the drive shaft 34 is fixed to the drive shaft 34 at a position eccentric from the rotation center of the drive shaft 34.
On the other hand, the upper end is brought into frictional contact with the upper bottom surface 50 </ b> A in the recess 50. That is, the upper end of the clutch spring 52 is not fixed to the handle 48.
In the normal state, the clutch spring 52 is in a state where each of the windings is in contact with the peripheral wall surface 50B of the recess 50 in the handle 48 as shown in FIG.

In this water faucet 10, when the handle 48 is rotated in the forward direction (winding direction of the clutch spring 52) with the pilot valve body 28 spaced apart from the pilot valve seat 32 and opened, the rotational operation force is increased. This is transmitted to the drive shaft 34 based on the frictional contact force between the peripheral wall surface 50B of the recess 50 and each winding of the clutch spring 52, and the drive shaft 34 is rotated integrally with the handle 48 so that its axial direction, that is, in the drawing. It can be moved forward downward.
As a result, the pilot valve body 28 moves forward downward integrally in the figure, and the opening degree of the pilot water channel 26 is changed small. As a result, the main valve body 16 follows this and moves forward downward, narrowing the opening of the main water channel and reducing the flow rate of water.
Then, with the pilot valve body 28 seated on the pilot valve seat 32 and the main valve body 16 seated on the main valve seat 18, the main water channel is shut off and the flow of water stops.

When the handle 48 is further rotated in the forward direction in this state, the resistance against the forward movement of the drive shaft 34 is larger than the set value at this time, and therefore, as shown in FIG. Is elastically reduced in diameter with the rotation of the handle 48 and is in a radially contracted state.
Accordingly, even if the handle 48 is rotated in the forward direction in this state, the upper end of the clutch spring 52 only slips with respect to the upper bottom surface 50A of the recess 50 of the handle 48, and the rotational movement of the handle 48 is transmitted to the drive shaft 34. In other words, only the handle 48 is idled (idle operation).
That is, the drive shaft 34 does not rotate, that is, does not move forward downward in the figure, so that the pilot valve body and the main valve body 16 are pushed more strongly against the corresponding pilot valve seat 32 and main valve seat 18. There is no.

On the other hand, when the handle 48 is rotated in the opposite direction to that in the state, the clutch spring 52 expands and the respective windings are brought into frictional contact with the peripheral wall surface 50B of the recess 50 again.
Accordingly, the rotational movement of the handle 48 in the reverse direction is transmitted to the drive shaft 34 based on the frictional force between each winding of the clutch spring 52 and the peripheral wall surface 50B of the recess 50, and the drive shaft 34 rotates in the reverse direction. It can be moved backward in the figure by screw feed.

  Here, the pilot valve body 28 is separated from the pilot valve seat 32, and following this, the main valve body 16 is separated upward from the main valve seat 18 in the figure to open the main water channel. Furthermore, the flow rate of water is increased by greatly changing the opening of the main water channel by increasing the distance.

FIG. 6 shows the relationship between the amount of movement of the drive shaft 34 in the forward direction and the operation load of the handle 48. In FIG. 6, A is a relationship curve in this embodiment using the clutch spring 52, and B is such a curve. The relationship curve in the faucet which directly connected the handle 48 and the drive shaft 34 without using the clutch spring 52 is shown.
As shown in the figure, in the faucet 10 of this embodiment, the operation load of the handle 48 slightly increases when the main valve body 16 contacts the main valve seat 18, but the operation load is larger than that. Must not.

On the other hand, in a configuration in which the handle 48 and the drive shaft 34 are directly connected, the drive shaft 34 is moved forward with compression of the elastic material even after the main valve body 16 is seated on the main valve seat 18. The operation load becomes large. Therefore, when the main valve body 16 is subsequently opened, a large force is required, and the operation at that time becomes heavy.
As described above, according to the present embodiment, an increase in operating resistance due to excessive pushing of the main valve body 16 with respect to the main valve seat 18 is avoided, and the drive shaft 34 is moved back and forth and the valve body is displaced with a light operation at all times. Can be done.

FIG. 7 shows another embodiment of the present invention.
In this embodiment, a magnet (permanent magnet) 54A is provided over the entire periphery of the drive shaft 34, while a cylindrical magnet 54B corresponding to the handle 48 side is provided so as to surround the magnet 54A. In this example, the magnet 54B is rotated together with the handle 48, and the magnets 54A and 54B constitute a clutch mechanism.

Here, the externally threaded male threaded portion 40 of the drive shaft 34 is screwed into the female threaded portion 46 of the body 42, and is thereby moved forward and backward in the vertical direction in the figure by screw feed.
Reference numeral 56 denotes a water stop cap, and the drive shaft 34 is housed in a recess 58 formed inside the water stop cap 56.
Reference numeral 60 denotes a seal member for sealing the space between the body 42 and the water stop cap 56 in a watertight manner.
Here, a slight gap is formed between the magnet 54 </ b> A and the peripheral wall surface of the recess 58.
In this embodiment, the magnet 54A is alternately magnetized with N poles and S poles along the circumferential direction, and the magnet 54B is correspondingly alternating with N poles and S poles along the circumferential direction. Is magnetized.

In this embodiment, when the handle 48 is rotated in the forward direction, the drive shaft 34 is rotated in the same direction by the magnetic attractive force of the magnets 54A and 54B, whereby the drive shaft 34 is advanced downward in the figure by screw feed. Moved.
Then, after the main valve body 16 is seated on the main valve seat 18 and the pilot valve body 28 is seated on the pilot valve seat 32, the handle 48 is idling due to the resistance of the drive shaft 34 that suddenly increases. Become.

That is, the interlocking state between the handle 48 and the drive shaft 34 is maintained by the magnets 54A and 54B. The increase in resistance due to the seating of the main valve body 16 and the pilot valve body 28 on the main valve seat 18 and the pilot valve seat 32. The interlocking state is interrupted by this, and only the handle 48 is idled.
Therefore, the main valve body 16 and the pilot valve body 28 are not pushed into the corresponding main valve seat 18 and pilot valve seat 32 beyond that, as in the above embodiment.
Therefore, the resistance when the handle 48 is rotated in the reverse direction to open the valves is small, and they can be easily opened with a light operation.

In the case of the above-described embodiment shown in FIGS. 1 to 5, the pressure of the back pressure chamber 22 acts upward on the drive shaft 34. As a result, when the drive shaft 34 is advanced downward in the figure, the pressure is resisted. And you have to move this forward.
Accordingly, although the operation load is slightly increased accordingly, in the case of the embodiment shown in FIG. 7, the pressure from the back pressure chamber 22 works upward and downward with respect to the drive shaft 34, and these are offset. When the drive shaft 34 is advanced downward in the drawing, it is not necessary to push down the pressure against the pressure of the back pressure chamber 22, and the operation can be advantageously lightened accordingly.

Furthermore, in this embodiment, the water can be stopped by storing the drive shaft 34 in the water stop cap 56, and the advantage that water stop is easy is also obtained.
Further, in this embodiment, there are many common parts with the embodiment of FIG. 9 described later, and there is an advantage that the faucet of FIG. 9 can be configured only by exchanging the rotary handle 48 and the stepping motor 62 (FIG. 9).

Next, FIG. 8 shows still another embodiment of the present invention.
In this embodiment, instead of the handle 48 described above, the rotation operation unit is configured by a stepping motor 62, and instead of the magnet 54B in FIG. The magnet 54A and the solenoid coil 64 constitute a clutch mechanism.
The solenoid coil 64 also forms a main part for applying a rotational operation force.
In this embodiment, the drive shaft 34 itself forms a rotor in the stepping motor 62.

In this embodiment, the magnet 54A, that is, the drive shaft 34 is rotated by sequentially supplying pulses to a plurality of pole teeth formed at a predetermined pitch in the circumferential direction so as to surround the magnet 54A and exciting them.
When the rotational resistance of the drive shaft 34 becomes larger than the set value, specifically, when the resistance force against rotation is increased by closing the main valve body 16 and the pilot valve body 28, the stepping motor 62 is emptied. In operation, no further force for closing the main valve body 16 and the pilot valve body 28 is applied.

FIG. 9 shows still another embodiment of the present invention.
In this example, the rotor in the stepping motor 62 is configured by a magnet 54A having a bottomed cylindrical shape, and the male screw portion 40 of the drive shaft 34 is screwed into the female screw portion 46 on the inner peripheral surface thereof, and the magnet 54A is rotated. In this example, the drive shaft 34 is advanced and retracted by screw feed.
In this embodiment, a stepping motor 62 including a rotor including a magnet 54A and a stator including a solenoid coil 64 serves as a rotation operation unit.

That is, in the embodiments so far, the drive shaft 34 itself is rotated and moved forward and backward by the rotation operation unit. However, in this embodiment, the drive shaft 34 itself does not rotate and moves forward and backward by screw feed. There is.
Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is principal part sectional drawing of the water tap which is one Embodiment of this invention. It is sectional drawing which decomposed | disassembled and showed the principal part of the water tap shown in FIG. It is action | operation explanatory drawing of the clutch spring in the same embodiment. It is action | operation explanatory drawing of the valve part of the embodiment. FIG. 5 is an operation explanatory diagram following FIG. 4. It is a figure showing the relationship between the movement amount of the drive shaft and the operation load of a handle in the same embodiment. It is a figure of the principal part of other embodiment of this invention. It is a figure of the principal part of other embodiment of this invention. It is a figure of the principal part of other embodiment of this invention. It is a figure which shows an example of the conventional water tap. It is a figure which shows an example of the faucet concerning a prior application as a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water tap 12 Inflow water path 14 Outflow water path 16 Main valve body 18 Main valve seat 22 Back pressure chamber 24 Water guide hole 26 Pilot water path 28 Pilot valve body 34 Drive shaft 48 Handle 52 Clutch spring 54A, 54B Magnet 64 Solenoid coil

Claims (2)

In the faucet that adjusts the flow rate by rotating the drive shaft that drives the valve body by the rotational operation force applied from the rotational operation unit, moving it forward and backward in the axial direction,
A clutch mechanism that shuts off the interlocking state between the rotation operation portion and the drive shaft and idles the rotation operation portion when the resistance to advancing of the drive shaft becomes larger than a set value due to the valve closing. A water faucet characterized by interposing between the rotary operation unit and the drive shaft.   (a) a main valve element that changes the opening of the main water channel, (b) a back pressure chamber that acts on the main valve element as a pressing force in the valve closing direction, and (c) the main water channel A water introduction hole composed of a small hole for guiding the water in the primary inflow water channel to the back pressure chamber to increase the pressure in the back pressure chamber; and (d) the water in the back pressure chamber on the secondary side in the main water channel The pilot valve body in a pilot-type valve mechanism having a pilot water passage that reduces the pressure of the back pressure chamber by being drawn into the outflow water passage, and (e) a pilot valve body that changes an opening degree of the pilot water passage. The faucet according to claim 1, wherein the faucet is displaced by advancing and retreating of the shaft.

Images