JP2541047B2 - Single lever type mixed faucet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-lever type mixing faucet, and more particularly to a single-lever type mixing faucet which is improved to prevent water leakage from the sliding surfaces of disc valves.

[0002]

2. Description of the Related Art A faucet provided with a ceramic disk valve is widely used as a faucet for controlling a flow rate or switching a flow path. As an example of this type of faucet, FIG. 5 and FIG.
A single lever type hot and cold water mixing faucet and a ceramic disc valve used therein will be described with reference to FIG.

5 and 6, the lever handle 10 is shown.
Has a boss 12 at its proximal end, which is
Is connected to the upper end of the spindle 16 mounted on the upper part of the spindle. Reference numeral 17 denotes a screw for fixing the lever handle 10 to the spindle 16. The spindle 16 is rotatable in a vertical plane by a horizontal pin
Attached to. The rotating frame 20 is mounted on the upper surface of the housing 14 so as to be horizontally rotatable. The spindle 16 is rotatable around the horizontal pin 18 within a range where the flange 16a of the spindle 16 hits the rotating frame 20.

A spherical connecting projection 22 is provided on the lower end of the spindle 16 so that the connecting projection 22 is fitted in a receiving hole 26 of a ceramic disk valve (movable disk valve) 24. The valve body 24 is linearly moved (slid) in the front-rear direction on the ceramic disk valve 30 by the swing of the spindle 16 accompanying the operation of the lever 10 in the vertical direction, and the water supply amount is adjusted.

Further, a rotary skeleton 20 to which a horizontal pin 18 serving as a spindle of the spindle 16 is attached is held on an upper surface portion of the housing 14 so as to be able to rotate in a horizontal plane, so that the lever handle 10 can be horizontally moved. The rotation of the spindle 16 is transmitted to the body 20, and the movable disc valve 24 is rotated left and right to adjust the hot water flow rate and the cold water flow rate to adjust the hot water temperature. Note that the axis of the connecting projection 22 is displaced from the axis of the spindle 16, and when the spindle 16 is rotated by the lever handle 10, the connecting projection 22 becomes equiradial around the axis of the spindle 16 as the rotation center. The valve body 24 is rotated right and left.

The movable disc valve 24 has a recess 2 on its lower surface side.
8 is formed, and the lower surface is a sliding surface that slides on the ceramic disk valve (fixed disk valve) 30.

The fixed disc valve 30 is fixed in the housing 14 and has a hole 3 for flowing out the mixed water in the thickness direction thereof.
2. A water inflow hole (water supply hole) 34 and a hot water inflow hole 36 are provided so as to penetrate therethrough, and by moving the movable disk valve 24 forward and backward and left and right, the opening areas in which these holes 32, 34, 36 and the concave portion 28 overlap with each other. By changing the flow rate and the hot water temperature.

The housing 14 has a cylindrical shape with a lid and a bottom, and is fixed to a case 39 by long bolts 37. A bottom cover 38 is fitted to the bottom of the housing 14. The bottom cover 38 is provided with an opening 40 and the like at a position corresponding to the hole 32 and the like. The opening 40 and the like communicate with the water discharge pipe 44 of the faucet, the water leg pipe (not shown), and the hot water leg pipe 46 through the opening 42 of the support portion provided in the case 39. The housing 14 and the bottom lid 38 constitute a faucet shell.

Reference numeral 47 is a sliding plate made of a highly slidable synthetic resin interposed between the upper surface of the movable disc valve 24 and the rotary frame 20.

[0010]

In the single lever type mixed faucet as described above, it is necessary that water does not leak from the sliding surfaces of the disc valves 24 and 30. for that reason,
Conventionally, the long bolt 37 is tightened tightly and the disc valve 2
The sliding surfaces of 4, 30 are strongly pressed against each other.

However, as described above, the disc valves 24 and 3 are
When 0 members are strongly pressed against each other, the slidability of the disk valves 24 and 30 deteriorates, resulting in a phenomenon that the handles are heavy.

Further, particularly when the water discharge pipe 44 is provided with a water shutoff valve (for example, a solenoid valve), a high water hammer pressure (water hammer) is generated when the water shutoff valve is closed. There was a risk that the sliding surfaces of 24 and 30 would be shocked and that water would leak from the sliding surfaces.

[0013]

A single-lever type mixed faucet according to a first aspect of the present invention is a fixed fixture in which a water flow hole, a hot water flow hole, and a mixed water flow hole are respectively provided in the thickness direction of the board. A disc valve and a plate surface are slidably overlapped on the fixed disc valve. The plate surface has a water flow hole of the fixed disc valve, a hot water flow hole, and a mixed water flow hole. Single-lever type including a movable disc valve provided with a recess for communicating with each other, a spindle for moving the movable disc valve in a sliding direction, and a housing surrounding the fixed disc valve and the movable disc valve. In the mixed faucet, a head cap is mounted on the side of the movable disc valve opposite to the sliding disc surface so as to be movable in the direction perpendicular to the sliding disc surface and in a watertight manner with respect to the movable disc valve. Valve and head The back pressure chamber is formed between the cap,
The movable disc valve is provided with a water conduit for constantly communicating the back pressure chamber with the water flow hole of the fixed disc valve, and the spindle is engaged with the head cap.

The single-lever type mixed faucet according to claim 2 is
The single-lever type mixed faucet according to claim 1, wherein a circular recess is provided on a disk surface of the movable disk valve opposite to a sliding disk surface, and the head cap is fitted into the recess, and an outer peripheral surface of the head cap. And an inner peripheral surface of the concave portion of the movable disk valve, an O-ring is interposed, and a spring for pressing the head cap and the movable disk valve in a separating direction is interposed between the bottom surface of the concave portion and the end surface of the head cap. A protrusion is provided on one of the movable disc valve and the head cap, and an engaging portion of the protrusion is provided on the other.

The single-lever type mixed faucet according to claim 3 is
The single-lever mixed faucet according to claim 1 or 2,
The water conduit is a small hole that penetrates the movable disc valve in the thickness direction of the panel, and a groove formed on the sliding surface of the movable disc valve,
And a groove formed on the sliding surface of the fixed disc valve.

[0016]

In the single-lever type mixed faucet of the present invention, when water pressure (supply water pressure or water hammer pressure) is applied to the water flow hole in the fixed disc valve, this water pressure is transferred to the back pressure via the water conduit. It is propagated to the chamber and pressure is applied in the direction in which the movable disc valve is in close contact with the fixed disc valve. Therefore, even if a large water pressure is applied, the seal pressure of the disc valves increases accordingly, and water leakage is reliably prevented.

Further, in the single-lever type mixing faucet of the present invention, since the urging force such as the bolt fastening force for constantly pressing the disc valves in the close contact direction is small, the movable disc valve can be operated lightly. Yes, the handle is lighter.

In the single-lever type mixed faucet according to the second aspect, even if the housing expands and contracts due to heat, the head cap can be advanced and retracted following the expansion and contraction of the movable disk valve to the fixed disk valve at all times. it can.

In this case, an O-ring is interposed between the outer peripheral surface of the head cap and the inner peripheral surface of the recess of the movable disk valve, and the watertightness between these peripheral surfaces is good.

In the single-lever type mixed faucet according to the third aspect, the back pressure chamber can be communicated only with the water supply hole of the fixed disc valve.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a main part of a single-lever type mixing faucet according to an embodiment of the present invention, and FIGS.

In this embodiment, a circular recess 24A is provided above the ceramic movable disc valve 24. The lower half portion (having a circular shape) of the head cap 50 made of highly slidable synthetic resin is inserted into the recess 24A,
A back pressure chamber 52 is formed between the upper surface of the movable disc valve 24 and the head cap 50.

In this embodiment, the ceramic disc valve 24
Has a step portion formed on the outer peripheral edge of the upper surface thereof, and the lower end of the headless cap 50 having a bottomless lid is engaged with the step portion so that the head cap 50 and the movable disc valve 24 rotate integrally. ing.

In order to make the inside of the back pressure chamber 52 always communicate with the water flow hole 34 of the fixed disk valve 30, a water guide path including a small hole 54 and a groove 55 of a sliding surface is formed in the movable disk valve 24. There is. The groove 55 is connected to the small hole 54. Also, on the sliding surface of the fixed disc valve 30, a very short groove 57 extends from the edge of the water flow hole 34 as shown in FIGS.

The outer peripheral surface of the head cap 50 and the recess 24A
An O-ring 56 for sealing is arranged between the inner peripheral surface and the inner peripheral surface. In addition, the lower end surface of the head cap 50 and the recess 24
The leaf spring 62 is interposed between the bottom surface of A and the bottom of
The movable disc valve 24 is pressed against the fixed disc valve 30.

A receiving hole 58 on the upper surface of the head cap 50.
A spherical connecting projection 22 at the lower end of the spindle 16 is fitted to the.

In this single lever type mixed faucet, hot water, mixed water and water are discharged as shown in FIGS. Note that FIG. 2 shows the discharge of hot water, and FIG. 3 shows the discharge of mixed water.
FIG. 4 relates to the water discharge mode, and in each figure, (a) figure is when water is stopped, (b) figure is an intermediate amount, and (c) figure is when fully opened.

As shown in the figure, in any state, the groove 55 communicates with the water supply hole 34, and the water supply pressure is the back pressure chamber 52.
Is always added to. The movable disk valve 24 is pressed against the fixed disk valve 30 by the total pressure of the pressing force from the housing 14 due to the tightening of the long bolt 37, the pressing force of the leaf spring 62, and the back pressure. The valve 24 is always pressed against the fixed disc valve 30 by a pressure slightly higher than the water supply pressure, so that water leakage from the sliding surfaces of the disc valves 24 and 30 is reliably prevented and the movable disc valve 24 is also lightened. Comes to slide on.

Even if the tightening force of the long bolt 37 is lightened, sufficient water sealing property can be obtained.
It is possible to reduce the stress applied to the housing 14 and prevent material fatigue.

In this embodiment, as shown in FIGS.
The back pressure chamber 52 is always communicated with the water flow hole 34 of the fixed disk valve 30 by the small hole 54 and the groove 55. Therefore,
Even if a water hammer occurs due to a sudden stop of water, this water hammer pressure is propagated to the back pressure chamber 52 and strongly presses the movable disc valve 24 against the fixed disc valve 30, so that water leakage is reliably prevented. it can.

In this embodiment, since the head cap 50 engages with the movable disc valve 24 so as to be able to advance and retreat in the direction perpendicular to the disc valve sliding surface, the housing 14 (not shown in FIG. 1) undergoes thermal expansion. In this case, the head cap 50 moves in the direction away from the disc valve sliding surface in accordance with this. Since the movable disc valve 24 is pressed against the fixed disc valve 30 by the back pressure due to water pressure and the pressing force of the leaf spring 62, the watertightness of the disc valve sliding surface is maintained to be good.

The head cap 50 has entered the recess 24A, and the water pressure introduced into the back pressure chamber 52 is applied to the head cap 50 in the diameter reducing direction. Therefore, the head cap 50 is not deformed by water pressure.
Water pressure is applied to the inner peripheral surface of the recess 24A in the direction of expanding the recess 24A, but since the disc valve 24 is made of ceramic, it is not deformed at all by the water pressure. Therefore, the distance between the inner peripheral surface of the recess 24A and the outer peripheral surface of the head cap 50 is always constant, and the watertightness of the O-ring 56 is always very good.

[0033]

As described above, according to the single-lever type mixed water faucet of the present invention, the water pressure for urging the movable disc valve and the fixed disc valve in the direction in which the movable disc valve and the fixed disc valve are in close contact can be constantly applied to the movable disc valve. The sliding surfaces of the valves are very watertight.

Further, the tightening force of long bolts or the like for pressing the disc valves in the close contact direction can be relieved, the sliding resistance of the disc valve is small, and the handle operation of the faucet becomes light. Further, it is possible to prevent the material fatigue of the faucet shell, to reduce the required strength, and to simplify the assembling, thereby improving the durability and reducing the production cost.

According to the second aspect, the watertightness of the sliding surface of the disk valve is maintained good even if the housing is thermally expanded.

According to the third aspect, the back pressure chamber can be surely communicated only with the upstream side (water supply side) of the water shut-off portion (sliding surface of the disc valves).

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a single lever type mixed faucet according to an embodiment.

FIG. 2 is a plan view showing an engaged state of disc valves.

FIG. 3 is a plan view showing an engaged state of disc valves.

FIG. 4 is a plan view showing an engaged state of the disc valves.

FIG. 5 is a cross-sectional view of a conventional single lever type hot and cold water mixing faucet.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 is a plan view of a conventional ceramic disc valve.

[Explanation of symbols]

 10 Lever Handle 14 Housing 16 Spindle 24 Movable Disc Valve 30 Fixed Disc Valve 50 Head Cap 52 Back Pressure Chamber 54 Small Hole 55 Groove

Claims (3)

(57) [Claims] 1. A fixed disc valve having a water flow hole, a hot water flow hole, and a mixed water flow hole penetrating in the thickness direction of the board, and a board surface slidable with respect to the fixed disk valve. A movable disc valve which is installed in an overlapping manner and has a concave portion for communicating with the water passage hole of the fixed disc valve and the passage hole of the hot water and the passage hole of the mixed water on the plate surface; A single-lever type mixed faucet comprising a spindle for moving a disc valve in a sliding direction, and a housing surrounding the fixed disc valve and the movable disc valve, wherein the sliding disc surface of the movable disc valve is opposite. A head cap movably in a direction perpendicular to the sliding plate surface and watertightly attached to the movable disc valve to form a back pressure chamber between the movable disc valve and the head cap. Back pressure chamber Provided headrace to constantly communicated to the fluid passing holes of the water of the disc valve to the movable disc valve, single lever mixing faucet said spindle, characterized in that engaged in the head cap. 2. The single-lever type mixed faucet according to claim 1, wherein a circular recess is provided on a disk surface of the movable disk valve opposite to the sliding disk surface, and the head cap is fitted into the recess. An O-ring is interposed between the outer peripheral surface of the head cap and the inner peripheral surface of the recess of the movable disk valve, and the head cap and the movable disk valve are pressed in the direction of separation between the bottom surface of the recess and the end surface of the head cap. A single-lever type mixing faucet characterized in that a protrusion is provided on one of the movable disc valve and the head cap, and an engaging portion of the protrusion is provided on the other, with a spring interposed therebetween. 3. The single-lever type mixed faucet according to claim 1 or 2, wherein the water conduit is formed in a small hole penetrating the movable disc valve in the thickness direction of the panel and a sliding surface of the movable disc valve. And a groove formed on the sliding surface of the fixed disc valve.