JP2011001762A - Single lever combination faucet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single lever combination faucet preventing the damage of a mixing valve inside a valve cartridge due to freezing of residual water by draining well the residual water remaining in the valve cartridge at the stop of water.SOLUTION: The single lever combination faucet 10 includes the valve cartridge 30 formed by storing, in a valve case 32, the mixing valve 54 comprising a fixed disk valve element 56 and a movable valve element 60 having a movable disk 58. The single lever combination faucet 10 also includes an intake valve 97 having an intake passage 102 leading air into the valve cartridge 30 at the stop of water, and an intake valve element 104 opening/closing the intake passage 102, and closing the intake valve element 104 with flow pressure when discharging water while opening the intake valve element 104 at the stop of water to lead in air through the intake passage 102. The intake valve 97 is built in the valve cartridge 30.

Description

  The present invention relates to a single lever mixing faucet, and in particular, to a device equipped with a freeze prevention mechanism.

  2. Description of the Related Art Conventionally, it has a valve cartridge in which a mixing valve composed of a fixed disk valve body and a movable valve body having a movable disk sliding on the fixed disk valve body is housed in a valve case. A single lever mixed faucet that moves the movable valve body by operation to adjust the flow rate and temperature of the water discharge and water discharge is widely used.

FIG. 10 shows an example disclosed in Patent Document 1 below.
FIG. 10 shows a valve cartridge which is a main part of a single lever mixing faucet. In FIG. 10, reference numeral 200 denotes a valve case having a two-part structure of an upper case body 202 and a lower bottom cover 204. There is housed therein a mixing valve 210 composed of a fixed disk valve body 206 and a movable valve body 208 having a movable disk 207 sliding on the upper surface thereof.
Here, the movable valve body 208 has a disk cap 212 that is formed separately from the movable disk 207 and is assembled to the movable disk 207.

The fixed disc valve body 206 is provided with respective inlets 214 for water and hot water, and at another position, an outlet 216 for water, hot water or mixed water (hereinafter simply referred to as mixed water) is provided. .
On the other hand, the movable valve body 208 is provided with a mixing chamber 218 for mixing water and hot water flowing in from the inlet 214 across the movable disk 207 and the disk cap 212.

In the mixing valve 210, water and hot water flowing in from the inlet 214 of the fixed disk valve body 206 are mixed in the mixing chamber 218 of the movable valve body 208, and downstream through the outlet 216 of the fixed disk valve body 206. leak.
Here, the mixing chamber 218 of the movable valve body 208 and the outlet 216 of the fixed disk valve body 206 communicate with the secondary flow path downstream of the mixing valve 210 in the water stop state shown in FIG. An internal flow path is formed.

220 is a lever shaft that operatively connects the disc cap 212 and the lever handle, and is connected to the rotating body 224 via a support pin 222 that extends in a direction perpendicular to the paper surface. The left and right directions in the figure can be rotated.
On the other hand, the rotating body 224 is assembled to the valve case 200 so as to be rotatable around an axis in the vertical direction in the drawing.

A water hammer prevention mechanism 226 is incorporated in the disk cap 212.
The water hammer prevention mechanism 226 includes a cylinder 228 integrally formed with the disc cap 212, a piston 230 fixed to the rotating body 224 and slidably fitted in the cylinder 228, and a throttle valve 232. When the lever shaft 220 is operated to stop water from the water discharge state shown in FIG. 10A to the water stop state shown in FIG. 10B, the water in the cylinder chamber 234 is pushed out and mixed through the flow passage 236. Flow to the chamber 218 side.

That is, the water in the cylinder chamber 234 is caused to flow through the flow passage 236 to the internal flow path side of the mixing valve 210 that is in communication with the secondary flow path when the water is stopped.
And the operation of the lever handle is made heavy by the flow resistance at that time, thereby suppressing the sudden closing operation of the lever handle and preventing the occurrence of the water hammer.

  In such a single-lever mixing faucet, conventionally, the remaining water remaining in the valve cartridge at the time of water stoppage causes a problem of so-called pota leakage, and the remaining water freezes in winter. Therefore, there is a problem that the mixing valve 210 and the like may be damaged due to volume expansion.

Conventionally, it has been proposed or proposed to provide a water draining mechanism for preventing freezing at various locations in the faucet.
For example, in Patent Document 2 and Patent Document 3 below, when water is flowing through the flow path, the intake valve body is closed with a fluid pressure, and the intake valve body is opened based on a negative pressure that is instantaneously generated when water stops. A faucet is disclosed in which air is drawn into a flow path by providing an intake valve to be valved, and residual water is discharged to prevent freezing.

  However, what has been proposed in the past is that the water inside the cartridge of the single lever mixing faucet cannot be drained at the time of water stoppage, and the problem caused by freezing of the remaining water inside the valve cartridge cannot be solved. .

Japanese Patent Laid-Open No. 8-42724 Japanese Utility Model Publication No.59-17987 JP 2000-45344 A

  The present invention is based on the circumstances as described above, and it is possible to drain water remaining in the valve cartridge well at the time of water stoppage. The freezing caused by the residual water damages the mixing valve in the valve cartridge. The present invention has been made for the purpose of providing a single lever mixing faucet that can prevent this.

  Thus, according to the first aspect of the present invention, a mixing valve composed of a fixed disk valve body and a movable valve body provided with a movable disk sliding on the fixed disk valve body is housed in the valve case. In a single lever mixing faucet having a valve cartridge and moving the movable valve body by operating a lever handle to adjust the flow rate and temperature of discharged water and discharged water, 2 on the downstream side of the mixing valve when the water stops It has an intake passage that introduces air into the internal flow passage of the mixing valve that is in communication with the secondary flow passage, and an intake valve body that opens and closes the intake passage, and closes the intake valve body with fluid pressure during water discharge. An intake valve is incorporated in the valve cartridge. The intake valve is opened when the water is stopped and the intake valve body is opened to draw air into the internal flow path through the intake passage.

  According to a second aspect of the present invention, in the first aspect, the intake valve is provided above the internal flow path.

  According to a third aspect of the present invention, in the second aspect, the movable valve body has a disk cap on the upper side of the movable disk, and the intake valve is provided on the disk cap.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the disk cap includes a cylinder and a piston that is fitted into the cylinder and that slides inside the cylinder, and the water in the cylinder chamber is used during a water stop operation. Is provided with a water hammer preventing mechanism that makes the lever handle heavy by operating the flow resistance by flowing toward the internal flow path, and the intake valve includes a water flow passage in the cylinder chamber and the cylinder chamber. Is used as a part of the intake passage, and the intake valve body is arranged in the cylinder chamber.

  According to a fifth aspect of the present invention, in the fourth aspect, a through hole that forms a part of the flow passage is provided at the bottom of the cylinder, and the opening of the through hole on the intake valve body side is formed on the intake valve body. It is not closed by contact with the bottom.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the bottom portion of the cylinder is provided with a throttle portion that restricts a flow when the water in the cylinder chamber is pushed out to flow.

Effects and effects of the invention

  As described above, the present invention has the intake passage that introduces air into the internal flow path of the mixing valve when the water stops and the intake valve body that opens and closes the intake passage, and closes the intake valve body with the fluid pressure when discharging water. In addition, an intake valve that opens the intake valve body and draws air into the internal flow path through the intake passage when the water pressure is not applied is incorporated in the valve cartridge.

  According to the present invention, when water stops, air can be drawn into the valve cartridge and the remaining water inside the valve cartridge can be discharged. Therefore, when the water stops, the remaining water confined in the valve cartridge is filled with leaks. It is possible to satisfactorily prevent the mixing valve or the like from being damaged or causing freezing in winter or the like.

  Furthermore, according to the present invention, since the intake valve for draining water is incorporated in the valve cartridge, which is a unit of the central functional part in the faucet, the valve cartridge in which the intake valve is incorporated is simply attached in advance to the faucet. By attaching it to the faucet, it is possible to discharge the residual water inside the valve cartridge and also the water in the secondary flow path of the mixing valve when water stops, and to prevent them from freezing. Can do.

  In this case, the intake valve can be provided above the internal flow path formed in the mixing valve (claim 2).

  Further, in this case, the intake valve can be provided on a disk cap that is located above the movable disk and forms the movable valve body together with the movable disk.

According to a fourth aspect of the present invention, there is provided a cylinder and a piston that slides inside the cylinder, the water in the cylinder chamber is pushed out during the water stop operation, and the lever handle is caused to flow toward the internal flow path by the flow resistance. The disk cap is provided with a water hammer prevention mechanism that makes the operation of the cylinder heavy, and the flow passage and the cylinder chamber for flowing the water pushed out from the cylinder chamber are used as a part of the intake passage, and the intake valve body is arranged in the cylinder chamber. According to the fourth aspect of the present invention, the intake valve can be provided inside the valve cartridge by skillfully utilizing the water hammer prevention mechanism.
That is, by using the installation space and structure of the water hammer prevention mechanism, the intake valve can be added to the inside of the valve cartridge with less space and a simple structure.

  Next, according to a fifth aspect of the present invention, the opening on the intake valve body side of the through hole at the bottom of the cylinder that forms a part of the flow passage, that is, the intake passage is formed by bringing the intake valve body into contact with the bottom of the cylinder during intake. Is not closed.

A negative pressure is generated on the side of the internal flow path immediately after the water stops, and a force for pulling the intake valve body on the side of the through hole at the bottom of the cylinder acts on the intake valve body.
At this time, if the intake valve body closes the opening at the bottom of the cylinder, the intake passage is blocked, and air from outside cannot be drawn into the internal flow path.
However, according to the fifth aspect, such inconvenience can be satisfactorily avoided.

  In this case, it is possible to provide a stopper at the bottom of the cylinder so that the intake valve body does not close the opening of the through hole, or the intake valve body has a spherical shape, but the opening has a major axis dimension. By making the shape of the elongated hole larger than that of the spherical intake valve body or by making the opening two independent holes, the opening can be prevented from being closed by the intake valve body.

  According to the sixth aspect of the present invention, a throttle portion for restricting the flow when the water in the cylinder chamber is pushed out and made to flow is provided at the bottom of the cylinder, so that the water hammer preventing function of the water hammer preventing mechanism can be achieved. It can be further increased.

It is the figure which showed the single lever mixing faucet which is one Embodiment of this invention in the attachment state to the hand-washing machine. It is sectional drawing which showed the internal structure of the faucet of the embodiment in the water discharging state. It is the figure which showed the internal structure of the faucet of the embodiment in the water stop state. It is the perspective view which exploded and showed the valve cartridge in the embodiment. It is the figure which showed the intake valve in the same embodiment with the water hammer prevention mechanism. It is action explanatory drawing of the water tap of the embodiment. FIG. 7 is an operation explanatory diagram following FIG. 6. It is the figure which showed the structure of the principal part of the single lever mixing faucet of other embodiment of this invention with an effect | action. It is the figure which showed the aperture | diaphragm | squeeze part of FIG. It is the figure which showed the principal part of the conventionally well-known single lever mixing faucet.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a single lever mixing faucet provided upright on the counter unit 14 of the hand-washing machine 12, 16 is a faucet body, 18 is a lever handle provided on the upper part thereof, and 20 is a lever handle. A water outlet provided in the faucet body 16 toward the bowl of the hand-washing device 12.

2 and 3 show the internal structure of the faucet body 16 in detail. Here, FIG. 2 represents a water discharge state, and FIG. 3 represents a water stop state.
In the figure, reference numeral 22 denotes a housing constituted by the body of the faucet body 16 and has a cylindrical peripheral wall 24 and a bottom portion 26.
A pair of independent openings 28 through which water and hot water pass are formed in the bottom portion 26.

30 is a valve cartridge (valve unit) assembled in the housing 22, and 32 is a valve case in the valve cartridge 30.
The valve case 32 has a two-part structure of an upper case body 34 and a lower bottom lid 36, which are combined with each other vertically.
Here, the valve case 32, that is, the valve cartridge 30 is fixed by being pushed downward by screwing a fixing nut 38 into the upper portion of the housing 22.

As shown in FIG. 4, the bottom cover 36 has a pair of cylindrical portions 40 projecting downward from the lower surface, and legs 42, and their tips (lower ends) are the bottom portions 26 in the housing 22. It is made to contact | abut on the upper surface of.
An inflow passage 44 for water and hot water is formed inside the pair of cylindrical portions 40, and the inflow passage 44 is communicated with the opening 28 of the bottom portion 26.

The bottom lid 36 is also formed with a mixed water outflow passage 46 at a position different from the inflow passage 44.
A water chamber 48 defined by the bottom lid 36 and the housing 22 is formed below the outflow passage 46.
The water chamber 48 communicates with the water discharge port 20 through a flow path inside the faucet body 16.

  An elastic ring-shaped seal member 50 is held on the outer peripheral surface of the bottom lid 36, and the seal member 50 provides a watertight seal between the outer peripheral surface of the bottom lid 36 and the peripheral wall 24 of the housing 22. ing.

  A ring-shaped seal member 52 is held at the lower end surface of the tubular portion 40 at a position surrounding the inflow passage 44, and the seal member 52 provides a watertight seal between the lower surface of the tubular portion 40 and the bottom portion 26. Is sealed.

A mixing valve 54 is accommodated in the valve case 32.
The mixing valve 54 includes a fixed disk valve body 56 made of a ceramic disk and a movable valve body 60 having a movable disk 58 that slides on the upper surface thereof and is also made of a ceramic disk.

Here, the movable valve body 60 has a disk cap 62 serving as a drive unit on the upper side of the movable disk 58 that slides directly on the upper surface of the fixed disk valve body 56.
The disk cap 62 is a resin member configured separately from the movable disk 58, and the movable valve body 60 is configured by assembling the disk cap 62 and the movable disk 58.

  The fixed disk valve body 56 has a pair of water and hot water inflow ports 64 communicating with the inflow passage 44 and a mixed water penetrating outflow port communicating with the outflow passage 46 at another position. 66.

On the other hand, the movable valve body 60 is formed with a mixing chamber 68 that mixes the water and hot water flowing from the inlet 64 across the movable disk 58 and the disk cap 62.
The water and hot water flowing upward from the inflow port 64 are mixed in the mixing chamber 68, then flow out downward to the outflow passage 46 through the outflow port 66, and further to the spout 20 through the water chamber 48. The water is discharged from there.

  Here, as shown in FIG. 4, ring-shaped seal members 70 and 72 having elasticity are held on the upper surface of the bottom cover 36 so as to surround the pair of inflow passages 44 and outflow passages 46, respectively. The sealing members 70 and 72 seal the space between the bottom lid 36 and the fixed disk valve body 56 in a watertight manner.

  In the movable valve body 60, an elastic ring-shaped seal member 74 is held on the upper surface of the movable disk 58 so as to surround the mixing chamber 68, and the movable disk 58 and the disk cap 62 are held by the seal member 74. The space between and is sealed watertight.

Reference numeral 76 denotes a rotating body that is rotatably incorporated in the valve case 32.
As shown in FIG. 4, the rotating body 76 has a cylindrical shape, and has a flange portion 78 projecting radially outward in an annular shape at the lower end thereof.

Reference numeral 80 denotes a lever shaft, the upper end portion of which is connected to the lever handle 18 so as to move integrally with the lever handle 18.
The lever shaft 80 is coupled to the rotating body 76 via a support pin 82.
Here, the support pin 82 is oriented in a direction perpendicular to the paper surface, and the shaft end portion is fitted into a through-holding hole provided in the rotating body 76 and held there.

  As shown in FIG. 4, four engaging convex portions 84 are provided at the lower end portion of the lever shaft 80 in the drawing, and these engaging convex portions 84 are the movable valve body 60, specifically the disc cap 62. Are engaged with the corresponding four engaging recesses 86 provided on the upper surface of the.

  The lever shaft 80 rotates around the support pin 82 integrally with the lever handle 18 and also rotates together with the rotating body 76 around the rotation axis of the rotating body 76 to transmit the operation of the lever handle 18 to the movable valve body 60. The movable valve body 60 is slid in the corresponding direction.

Specifically, when the lever handle 18 is rotated in the vertical direction in FIGS. 2 and 3, the lever shaft 80 rotates around the support pin 82 to move the movable valve element 62 in the horizontal direction in the drawings. To stop the water and adjust the amount of water.
When the lever handle 18 is rotated in the direction perpendicular to the paper surface, the lever shaft 80 rotates together with the rotating body 76 around the rotation axis of the rotating body 76 in the vertical direction in the figure, and the movable valve body 60 is moved in the same direction. Rotate to adjust the temperature of the mixed water.

  A water hammer prevention mechanism 88 is incorporated in the disc cap 62. As shown in FIG. 5, the water hammer preventing mechanism 88 includes a cylinder 90 integrally formed with the disc cap 62 and a piston 92 fixed to the rotating body 76 slidably fitted therein. When the disc cap 62 moves to the right in the figure during the water stop operation, the piston 92 is pushed deeply into the cylinder 90 to push out the water inside the cylinder chamber 94, and is formed at the bottom 96 of the cylinder 90. The flow through the through hole 98 and the flow passage 100 including the through hole 98 is caused to flow toward the mixing chamber 68, and the lever handle 18 is heavily operated based on the flow resistance at that time, and the lever handle 18 is suddenly moved. Suppresses the closing operation and prevents water hammer.

In this embodiment, an intake valve 97 for preventing freezing due to residual water inside the valve cartridge 30 is provided on the disc cap 62 by utilizing the installation space and structure of the water hammer prevention mechanism 88.
Specifically, a through-hole 99 in the axial direction, that is, the left-right direction in the drawing, is formed in the piston 92.
As shown in FIG. 6 (III), the through-passage 99 is in a state in which the external air is communicated with the mixing chamber 68 side immediately after water stoppage, that is, the secondary side flow path downstream of the mixing valve 54 at the time of water stoppage. An intake passage 102 for introducing air into the internal flow path of the mixing valve 54 including the mixing chamber 68 and the outlet 66 is formed together with the cylinder chamber 94 and the flow passage 100 described above.
The intake valve 97 includes the intake passage 102 and a spherical intake valve body 104 disposed in the cylinder chamber 94.

6 and 7 show the action of the intake valve 97 together with the action of the water hammer preventing mechanism 88.
FIG. 6I shows a state during water discharge. At this time, the intake valve body 104 is pressed against the piston 92 by the fluid pressure acting on the intake valve body 104, and the through passage 99, that is, the intake passage 102 is closed. Therefore, the water in the valve cartridge 32 does not leak outside through the through passage 99 formed in the piston 92.

  When the lever handle 18 is turned downward in FIG. 2 to perform the water stop operation from such a water discharge state, the piston 92 relatively moves leftward in the drawing in the cylinder 90 at that time. The water in 94 is pushed out and flows to the mixing chamber 68 side through the flow passage 100. And the closing operation of the lever handle 18 becomes heavy based on the flow resistance at that time, and the generation of the water hammer due to the abrupt closing operation of the lever handle 18 is prevented.

  When the lever handle 18 is closed and the mixing valve 54 is closed as shown in FIG. 3, the internal flow path of the mixing valve 54 including the mixing chamber 68 and the outlet 66 is mixed. It is blocked from the inflow side into the chamber 68.

  In the case of the conventional single lever mixing faucet, the internal flow path of the mixing valve 54 including the mixing chamber 68 and the outlet 66 and the water inside the valve cartridge 30 connected thereto are confined and remained in the full state. End up.

However, in this embodiment, the intake valve 97 is provided, so that the internal flow path of the mixing valve 54 and the water in the valve cartridge 30 connected thereto, and further the water in the secondary flow path of the mixing valve 54 are smooth. To be discharged.
Specifically, the intake valve body 104 is directed leftward in FIG. 6 (III) based on the negative pressure generated in the mixing valve 54 due to the fact that the water in the secondary channel flows downward immediately after the water stoppage. The intake valve body 104 is separated from the piston 92 by the suction action.

That is, the intake valve element 104 that has closed the intake passage 102 opens the intake passage 102, and external air is sucked in with the flow of the cylinder chamber 94 and the flow passage 100 toward the water mixing chamber 68. It is introduced into the mixing chamber 68 side, that is, the internal flow path side of the mixing valve 54 through the passage 102.
As a result, water in the internal flow path of the mixing valve 54, water in the secondary flow path of the mixing valve body 54, and further water in the cylinder chamber 94 and the flow passage 100 in the valve cartridge 30 connected to the internal flow path are obtained. Discharged.

  As shown in FIG. 6 (III), even if the intake valve body 104 comes into contact with the bottom portion 96 of the cylinder 90 due to the suction force acting on the intake valve body 104 immediately after the water stops, the bottom portion 96 penetrates. The opening of the hole 98, specifically, the through-hole 98 on the intake valve body 104 side is not closed by the intake valve body 104.

  As shown in FIG. 5 (B), the cross-sectional shape of the through hole 98 is a long hole shape whose major axis dimension is larger than the diameter of the intake valve body 104, so that the intake valve body 104 is formed of the cylinder 90. The through-hole 98 is not closed even if it abuts against the bottom 96.

FIG. 7 (IV) shows a state in which a certain time has passed immediately after the water stoppage.
In this state, no negative pressure is acting on the intake valve body 104, and therefore the intake valve body 104 is supported by the lower wall portion of the cylinder 90 in the drawing by its own weight.
In this state, when the lever handle 18 is opened again to enter the water discharge state, the intake valve body 104 is again in the state shown in FIG. 6 (I) due to the fluid pressure acting thereon, and the intake passage 102 is closed.

  In the present embodiment as described above, air can be drawn into the valve cartridge 30 immediately after the water stops and the remaining water inside the valve cartridge 30 can be discharged. Therefore, the water is confined in the valve cartridge 30 when the water stops. It is possible to satisfactorily prevent the remaining water from leaking or causing the freezing in winter or the like to damage the mixing valve 54 and the like.

  Further, according to the present embodiment, since the intake valve 97 for draining water is incorporated in the valve cartridge 30 which is a unit of the central functional part in the faucet 10, the valve in which the intake valve 97 is simply incorporated in advance. By assembling the cartridge 30 in the faucet 10, it is possible to discharge the residual water inside the valve cartridge 30 and further the water in the secondary flow path of the mixing valve when water stops, and prevent them from freezing. Can be applied to the faucet 10.

  Furthermore, in this embodiment, the intake valve 97 can be added to the inside of the valve cartridge 30 with less space and a simple structure by utilizing the installation space and structure of the water hammer prevention mechanism 88.

8 and 9 show another embodiment of the present invention.
In this example, a throttle portion 105 is provided on the bottom portion 96 of the cylinder 90 to provide greater flow resistance when the water in the cylinder chamber 94 is pushed out and flows through the through hole 98.
Here, the narrowing portion 105 has a shallow dish shape, and a plurality of notches 106 are provided in the circumferential wall at predetermined intervals in the circumferential direction.

In addition, a circular throttle hole 110 having a diameter smaller than the diameter of the through hole 98 of the bottom portion 96 and the spherical intake valve body 104 is provided in the center portion.
An annular recess 112 is formed in the throttle hole 110 on the cylinder chamber 94 side, that is, on the intake valve body 104 side.
The throttle 105 is also provided with a plurality of radially extending grooves 114 on the inner surface on the cylinder chamber 94 side as shown in FIG. 9A, and these grooves 114 communicate with the annular recess 112. Yes.

  In the case of this example, when the water in the cylinder chamber 94 is pushed out of the cylinder chamber 94 by the closing operation of the lever handle 18, it flows through the small-diameter throttle hole 110 formed in the throttle portion 105. The flow resistance of the water hammer is increased compared to the above embodiment, and the water hammer prevention function by the water hammer prevention mechanism 88 is further enhanced.

  8 (II), even when the spherical intake valve body 104 is pressed against the throttle hole 110 of the throttle part 105 immediately after the water stoppage, the throttle hole 110 is connected to the cylinder chamber 94 and the flow by the annular recess 112 and the groove 114. The air is communicated with the passage 100, and air from outside is sucked into the mixing chamber 68 side of the mixing valve 54 through the throttle hole 110 without any trouble.

  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.

10 Single lever mixer tap 18 Lever handle 30 Valve cartridge (valve unit)
32 Valve case 54 Mixing valve 56 Fixed disc valve body 58 Movable disc 60 Movable valve body 62 Disc cap 90 Cylinder 92 Piston 94 Cylinder chamber 96 Bottom 97 Intake valve 98 Through hole 99 Through passage 100 Flow passage 102 Intake passage 104 Intake valve body 105 Aperture part

Claims (6)

A valve cartridge comprising a mixing valve composed of a fixed disc valve body and a movable valve body having a movable disk sliding on the fixed disc valve body, and having a valve cartridge inside the valve case, and operating the lever handle In the single lever mixing faucet that moves the movable valve body to adjust the flow rate and temperature of the discharge water and discharge water,
An intake passage that introduces air into the internal flow path of the mixing valve that is in communication with the secondary flow path on the downstream side of the mixing valve when the water stops, and an intake valve body that opens and closes the intake passage. An intake valve that closes the intake valve body with fluid pressure and opens the intake valve body when water stops and draws air into the internal flow path through the intake passage is incorporated in the valve cartridge. Single lever mixing faucet characterized by that.   2. The single lever mixing faucet according to claim 1, wherein the intake valve is provided above the internal flow path.   3. The single lever mixing faucet according to claim 2, wherein the movable valve body has a disk cap on the upper side of the movable disk, and the intake valve is provided on the disk cap. 4. The disk cap according to claim 3, wherein the disk cap includes a cylinder and a piston that is fitted to the cylinder and slides inside the cylinder, and pushes out water in the cylinder chamber during a water stop operation. A water hammer prevention mechanism is provided to make the lever handle heavy by the flow resistance by flowing to the side of
The intake valve uses the water flow passage of the cylinder chamber and the cylinder chamber as a part of the intake passage, and the intake valve body is arranged in the cylinder chamber. Single lever mixing faucet.   In Claim 4, The through-hole which makes a part of said flow path is provided in the bottom part of the said cylinder, The opening by the side of the said intake valve body of this through-hole is by contact | abutting to the said bottom part of this intake valve body A single lever mixing faucet characterized by being not closed.   6. The single lever mixing faucet according to claim 5, wherein a throttle portion is provided at a bottom portion of the cylinder for restricting a flow when the water in the cylinder chamber is pushed out and made to flow.

Images