JPH0131071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a hot water mixing faucet configured to mix hot water and water and discharge the mixture in two directions: a shower side and a spout side.

[Prior art]

A conventional hot water mixer faucet has a spout for supplying water to a bathtub, a washing area, etc., and is also configured to be able to supply water to a shower side. This is equipped with a shower on-off valve and a spout on-off valve that are operated by separate handles on the downstream side of a control valve that adjusts the temperature by changing the mixing ratio of hot water and water. Water can be supplied from both sides at the same time.

However, for example, if you open the spout valve while the shower valve is open and in use,
Since the mixed water can flow out in two directions from the inflow side, the flow path resistance is substantially reduced, causing a phenomenon in which the temperature of the mixed water changes.

To explain this phenomenon specifically, the water pressure of the water supply source and the hot water supply source that supplies hot water to the hot and cold water mixing faucet is generally higher on the water supply side, for example, the water pressure Pc on the water source side is 2 kg /
cm ² , and the water pressure P _H on the hot water source side is assumed to be approximately 0.5 Kg/cm ² . Here, pressure loss based on flow path resistance in the hot water mixer faucet when only the shower on-off valve is open.
If P ₁ is 0.3Kg/cm ² , then the water supply pressures P _K and P _L in the hot and cold mixer faucet are respectively P _K = Pc - P ₁ = 1.7 Kg/cm ² ...(1) P _L = P _H -P ₁ =0.2Kg/cm ² ......(2).

Under these water supply and hot water supply pressure conditions, the mixture ratio of hot water and hot water is set, and mixed water at an appropriate temperature is discharged from the shower, but when the shower on-off valve is opened and the spout on-off valve is further opened, The flow path resistance is further reduced, and the pressure loss P ₂ based on this flow path resistance is reduced.
Assuming 0.1Kg/cm ² , water supply and hot water supply pressures P _M and P _N are respectively P _M = P _C − P ₂ = 1.9 Kg/cm ² ………(3) P _N = P _H − P ₂ = 0.4 Kg/cm ² ......(4)

Here, if the change ratio of water supply and hot water supply pressure before and after opening the spout on-off valve is Rc and _RH , then Rc=P _M /P _K ≒1.1 ......(5) R _H =P _N /P _L =2.0 ………(6) becomes.

Therefore, compared to the rate of change in the flow path resistance of the water supply side pressure, the rate of change on the hot water supply side is approximately twice that, making it easier for hot water to flow, increasing the amount of hot water discharged, and increasing the mixed water temperature. .

Due to the above-mentioned phenomenon, especially when the spout on-off valve is opened while the shower is in use, there is a danger that high temperature mixed water will be discharged from the shower equipment and cause burns.

On the other hand, a check valve is usually provided in the flow path from the hot water mixing faucet to the shower. This is to prevent hot water from flowing back into the bathtub when the mixer faucet becomes negative pressure, for example when a shower tool is dropped into the bathtub. It is mandatory to have a check valve to prevent This type of check valve has a gasket as a valve body in the secondary flow path, and is opened by the force of water flowing toward the shower device, and when the water force weakens, it opens due to the urging force using its own weight or a spring. The structure is such that the valve closes. However, the check valve itself is only activated by the flow of water, and is not a valve that prevents high-temperature water from flowing into the shower equipment. The problem persists.

[Purpose of the invention]

An object of the present invention is to automatically close a flow path when the mixed hot water flowing down in the shower direction reaches a certain temperature or higher, thereby preventing high-temperature mixed water from being discharged from the shower.

The technical problem to be solved by the present invention is that the spout and shower valves, which are operated by separate handles, are installed downstream of the control valve that manually adjusts the flow rates of hot water and water to produce mixed hot water at a predetermined temperature. To automatically shut off the supply of mixed water by closing the flow path to the shower side when the temperature of the mixed water supplied to the shower exceeds a certain temperature in a hot water mixing faucet equipped with an on-off valve for This shutoff is performed by a check valve built into the flow path to the shower side and a temperature sensing part that operates the check valve.

[Structure of the invention]

The configuration for achieving the above technical problem is that, in a hot water mixing faucet that is equipped with a spout on-off valve and a shower on-off valve in the middle of the mixed water flow path, the shower on-off valve part or the mixing valve on the downstream side of the valve part is The water flow path is provided with a high temperature shutoff valve that has a temperature sensing part and automatically opens and closes the flow path according to the temperature of the mixed water flowing down. It has a check valve structure that closes due to its own weight or biasing force.

With the above configuration, when the temperature of the mixed water flowing down to the shower reaches a high temperature while the shower is in use, the high-temperature shutoff valve automatically closes the flow path, preventing high-temperature water from being discharged from the shower, making it safe to use. can do.

Additionally, when the spout on-off valve is opened while the shower is in use, even if the temperature rises due to the flow path resistance as shown in the conventional example above, this prevents the spout from being discharged to the shower side, making it equally safe to use. can do.

Furthermore, the check valve structure of the high-temperature cutoff valve allows the packing incorporated as the valve body of the check valve to move in the valve opening and closing directions within the secondary flow path on the shower side, so that the operation of the temperature sensing part is prevented. Therefore, when the temperature is high, the gasket can be pressed against the valve seat to function as a high temperature cutoff valve. Therefore, in addition to high-temperature shutoff, the high-temperature shutoff valve can simultaneously prevent backflow through the check valve function without providing a new valve structure, and can be suitably used for shower equipment.

〔effect〕

The present invention achieves the following effects with the above configuration.

(i) It is safe to use because high temperature mixed water is not discharged from the shower.

(ii) Since no high-temperature shutoff valve is provided on the spout side, hot water at a desired temperature can be supplied when pouring hot water or the like.

(iii) Since the high temperature cutoff valve can use the conventional check valve structure as is, high temperature cutoff and backflow prevention can be performed without adding a new valve structure, providing optimal usability as a shower device.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 and FIG. 2 are a front sectional view and a side sectional view of a hot water mixing faucet according to the present invention.

A hot water mixing faucet main body 1 (hereinafter referred to as "main body 1") is fixed by protruding from the wall surface W by connecting pipes 2 and 3, which communicate with a water supply source, respectively, and the connecting pipes 2 and 3 are spaced apart from each other to the left and right inside the main body 1. A water channel 4 and a hot water channel 5 are formed which communicate with each other. A mixing chamber 8 is defined in the center of the main body 1 between the flow paths 4 and 5 by partition walls 6 and 7, and a shower head (not shown) is formed on the upper side by partition walls 9 and 10 that define the upper and lower sides of the mixing chamber 8. ) side is formed with an outflow chamber 11 and a water discharging device chamber 12 on the lower side, the inside of the main body 1 is divided into five chambers, and the downstream side from the mixing chamber 8 is configured as a mixed water flow path F.

Hot water and water are mixed in the mixing chamber 8, and a control valve A is provided to adjust the flow rate of hot water into the mixing chamber 8 and set the temperature of the hot water. An on-off valve B for the bus and an on-off valve C for the spout of an automatic closing type that opens and closes the flow path on the spout side through which water is discharged from the bath to the washing area are provided.

First, to explain the control valve A, the control valve cylinder body 20 is screwed onto the end wall of the water flow path 4, and one end of the control valve cylinder body 20 penetrates the circular seat 6a of the partition wall 6 and enters the mixing chamber 8. It has grown to. Reference numeral 21 denotes a control valve spindle, which is screwed into the control valve cylinder body 20 and includes a sub spindle 2 to which a control valve handle 22 is fixed.
1a, the control valve spindle 21 can move forward and backward in its axial direction by rotating the control valve handle 22. Note that the sub spindle 21a only rotates and does not move forward or backward in the axial direction. The portion of the control valve cylinder body 20 where the annular seat 6a is seated has a large diameter, and the water inlet 23 extends in the radial direction in the water flow path 4, and the water outlet 24 extends in the axial direction in the mixing chamber 8. It has been established. The control valve spindle 21 has valve body support parts 25 and 26 that bulge out in the radial direction in the mixing chamber 8 at a required interval, and each of the valve body support parts 25 and 26 has a conical valve body 27. , 28 are provided. As the control valve spindle 21 moves in the axial direction, the valve body 27 on the proximal end opens and closes the water outlet 24.
A water valve D is provided with a valve body 28 on the tip side that can open and close a hot water inlet 29 that is provided in the partition wall 7 and communicates the hot water inlet chamber 5 and the mixing chamber 8, and that opens and closes the hot water flow path on one axis. and hot water valve E. To mix hot water and hot water, the temperature of the mixed water is adjusted by changing the opening degree of each of water valve D and hot water valve E by rotating the control valve handle 22 and adjusting the flow rate of hot water. Can be done. In this embodiment, the control valve A is a mixing type, but it may be a two-valve type in which the hot water valve and the water valve each have a dedicated handle, or a single valve type in which the mixing ratio of hot water and water can be adjusted and opened/closed with one handle. It may be a lever method.

The shower on-off valve B includes an operating handle 30 projecting from the upper surface of the main body 1, and a valve shaft 31 that rotates integrally with the handle 30 is rotatably screwed into the main body 1. The partition wall 9 has an opening 32 that communicates the mixing chamber 8 with the outflow chamber 11 on the shower head side, and also forms a valve seat 33. It can move toward and away from the valve seat 33 to open and close the flow path on the shower head side of the mixed water. A connecting pipe 36 is attached to the back side of the main body 1 through a bushing 35 to the outflow chamber 11 on the shower head side.
6 is connected to a hose h which is connected to a shower head (not shown).

The connecting pipe 36 is formed in an L-shape, and an annular stepped portion 36a is formed in the rising flow path of the bent portion.
Reference numeral 37 denotes a temperature sensing body case which is a temperature sensing part with wax sealed therein, and has a protruding shaft 38 which can be moved in and out in the axial direction by thermal expansion and contraction of the wax. This thermosensitive body case 37 has a screw rod 39 extending downward, and a small guide piece 40 that comes into contact with the inner circumferential surface of the annular step 36a.
a, and a large guide piece 40b that abuts on the inner circumferential surface of the connecting pipe 36, and a gasket 41 is interposed between the two. This packing 41 uses the upper end surface 36b of the annular stepped portion 36a as a valve seat. That is, the gasket 41 is placed in the secondary flow path on the side of the shower device, and has the same function as a valve body of a check valve structure, which opens due to water force and closes due to its own weight when the water force decreases. It is built to have.

42 is a pressure receiving element that receives the protruding shaft 38;
2 is a joint 4 that connects the hose h and the connecting pipe 36;
The main part is a cylindrical body 44 which is coaxially attached to the connecting pipe 36 by 3. The cylindrical body 44 includes a flange 44b having a through hole 44a, and a cylindrical body portion 4 extending downward from the flange 44b and opening at the lower end.
4c, and a pressure receiving body 45 is slidably disposed within the cylindrical body portion 44c. This pressure receiving body 45 is urged toward the lower end opening side by a spring 46, and is prevented from falling off by a retaining ring 47.

The components arranged in the connecting pipe 36 constitute a high temperature shutoff valve H that automatically closes the flow path when the mixed hot water flowing down from the outflow chamber 11 to the shower head reaches a predetermined temperature.

Next, the spout opening/closing valve C is of an automatic closing type, which is opened by pressing a lever handle provided on the front surface of the main body 1, and automatically returns to the closed state by releasing this pressing.

As is clear from FIG. 2, the partition wall 10 has an annular opening 10a that is included in the vertical plane, and a cylindrical bushing 10b is screwed onto the back side of the main body 1 coaxially with the annular opening 10a. I'm wearing it. On the front side of the main body 1, the annular opening 10 is provided in the water spout side chamber 12.
A cylindrical case 50 in which an opening (not shown) having a threaded portion is formed coaxially with the opening and closing valve C, and which houses the components of the on-off valve C, is supported at its tip in the bush 10b and in the middle by the annular opening 10a. It is installed.

A spindle 51 is built into the case 50 and is moved back and forth in the axial direction by a lever handle 70.

Further, a mixed water outlet 52 is opened in the case 50 in the water spout chamber 12, and a valve seat 53 and a valve seat hole 54 are formed inside the case 50 in the mixing chamber 8.

Further, a valve body 56 is attached to the spindle 51 and has a gasket 55 attached to the front side for moving into and out of contact with the valve seat 53. The valve body 56 is built into the spindle 51 so as to be slidable in the axial direction on the inner peripheral surface of the case 50 in a watertight manner via a spring 57. There is.
The spring 57 urges the valve body 56 toward the valve seat 53, and when not in operation, the valve body 56 can remain seated on the valve seat 53 as shown in the figure. Further, a mixed water inlet 58 is opened at a position close to the valve seat 53, and when the valve body 56 is separated from the valve seat 53,
The mixed water in the mixing chamber 8 passes through the mixed water inlet 58 and the valve hole 54, and then from the mixed water outlet 52 to the water spout side chamber 1.
2 and can be discharged from the spout 12a. Incidentally, the spout 12a is attached to the main body 1 so as to be swingable.

Further, the storage space behind the valve body 56 is communicated with the mixing chamber 8 through a pressure reduction plate 60 having a small hole 59, and the pressure reduction plate 60 and the storage space serve as a pressure chamber P that substantially performs the valve closing operation. can be defined.

To open the spout on-off valve C, when the lever handle 70 is rotated downward, the spindle 51 moves in the axial direction, and the valve body 56 discharges the water in the pressure chamber P from the small hole 59 while the valve seat is opened. 53, the spout opening/closing valve C opens. If you release your hand from the lever handle 70 in this state, the valve body 56 is biased in the valve closing direction by the spring 57 and moves, but a pressure reducing plate 60 is placed in the pressure chamber P behind the valve body 56.
As the volume of mixed water flowing in through the small hole 59 increases, the valve body 56 gradually moves and closes, and the lever handle 70 also returns to its original position.

Therefore, the spout opening/closing valve C closes shortly after the lever handle 70 is released, and a predetermined amount of mixed water is discharged from the spout 12a during that time.

In addition to the self-closing type, the spout opening/closing valve C may have a structure in which it can be opened and closed manually by rotating a handle or the like.

In the above configuration, when the shower on-off valve B is opened, the mixed water from the mixing chamber 8 flows down from the outflow chamber 11 on the shower side toward the connecting pipe 36. At this time, the temperature sensitive body case 37 and various members integrally connected to the case in the high temperature shutoff valve H are floated by the force of the mixed water, and the gasket 41 separates from the upper surface 36b of the annular step 36a to open the valve. do.

As the temperature sensitive body case 37 floats, the protruding shaft 38 at the upper end comes into contact with the pressure receiving body 45, and in this state, mixed water is supplied to the shower side. Note that even if the temperature sensing element 37 rises rapidly due to the inflow of mixed water when the shower side on-off valve B is opened, the pressure receiving element 45 is supported by the spring 46, so the protruding shaft 38 will elastically move against the pressure receiving element 45. Damage to the temperature sensitive body case 37 due to collision can be prevented.

Here, pressure fluctuations in the water supply pressure or overheating of the hot water supply source may occur, or if you accidentally open the spout on-off valve C while taking a shower with the shower on-off valve B open, or the control valve handle The behavior of the high temperature cutoff valve H in the process of increasing the temperature higher than the set temperature by the control valve A will be described in the event of an erroneous operation such as rotating the valve 22 to the high temperature side.

As the temperature of the mixture passing through the high temperature cutoff valve H rises, the wax inside the temperature sensitive body case 37 expands.
The protruding shaft 38 gradually begins to extend. Therefore, the protruding shaft 3
As the protrusion amount of temperature sensor case 3 increases,
7 moves downward and the gasket 41 touches the annular stepped portion 36.
I try to sit on a. When the temperature of the mixed water exceeds the upper limit of the safe range for shower use, the wax further expands due to the influence of heat, and as the protruding shaft 38 extends, the packing 41 seats and opens the valve.

In order to configure the high temperature cutoff valve H to close when the mixed water temperature reaches a certain temperature, the coefficient of thermal expansion of the wax, the length of the protruding shaft, and the gap between the temperature sensitive body case 37 and the pressure receiving body 45 must be adjusted. Distance etc. should be taken into account.

As described above, high-temperature mixed hot water is not supplied to the shower side, and even if an abnormality occurs in the water supply source or an erroneous operation occurs during operation, the shower can be used safely.

In addition, the gasket 41 is incorporated as a check valve structure, so when the internal flow path of the main body 1 becomes negative pressure and water is about to be sucked in from the shower tool, it closes the flow path and directs the dirty water to the water supply side. backflow is prevented. In this way, by utilizing a structure that allows movement in the valve opening and closing directions within the secondary flow path toward the shower side, it is possible to provide the two functions of high temperature cutoff and backflow prevention.

FIG. 3 is a sectional view showing a second embodiment of the high temperature cutoff valve H.

The connecting pipe 36 is connected to the bushing 3 as in the first embodiment.
5 to the outflow chamber 11 on the shower side, and a plug 80 is screwed to the lower end. Further, a valve seat tube 81 is screwed onto the upper portion of the bent portion, and a gasket 82 that approaches and separates from the upper end surface 81a of the valve seat tube 81 is attached with a guide body 83 attached to its lower portion. 8
A spring 4 is interposed between the valve seat tube 81 and the guide body 83 and biases the gasket 82 in a direction to seat it.This spring 84 keeps the valve closed while the mixed water does not flow out.

85 is a pressure receiving body fixed to the connecting pipe 36 by a joint 43, and a required number of through holes 86 are opened to connect the hose h.
and the connecting pipe 36 are communicated with each other.

Reference numeral 87 is a shape-memory alloy spring having a shape-memory effect.
2 has a seating length and a biasing force, and is heat-treated so that it returns to its original state due to a shape memory effect when the temperature rises to a certain temperature T, and is configured as a temperature-sensing section that utilizes the deformation caused by this heat. be able to.
That is, it can be freely expanded and contracted and deformed up to a temperature T, but once this temperature T is exceeded, it stretches back to its original state after being heat-treated under the above conditions, and the packing 82
The valve can be closed by being seated on the valve seat tube 81.

The above-mentioned components form a high-temperature shutoff valve H, and its behavior when the mixed water flows out will be described below.

When the shower on-off valve B is opened, the outflow chamber 11
Mixed hot water at a set temperature is supplied into the connecting pipe 37, and the force of this mixed water is applied to both springs 84, 87.
The gasket 82 rises to open the valve by overcoming the urging force of , and the hose h can feed the mixed water.

Here, when the temperature of the mixed water flowing into the connecting pipe 36 exceeds the temperature difference due to water pressure and temperature fluctuations of the water supply source, the shape memory alloy spring 87 expands due to its shape memory effect and returns to its original state. It transforms back to its state. Therefore, Patsukin 8
2 is seated on the valve seat cylinder 81 and the valve is closed, and the shower can be used safely without high-temperature mixed hot water being discharged from the shower. In addition, since the packing 82 functions as a check valve as in the previous embodiment, the main body 1
Backflow to the side is prevented.

Incidentally, in both of the above two embodiments, since a high temperature cutoff valve is not provided in the spout side flow path, mixed water can be supplied to the bath or washing area regardless of the temperature.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view of a hot water mixing faucet according to the present invention, FIG. 2 is a side cross-sectional view of the same, and FIG. 3 is a cross-sectional view of essential parts showing a second embodiment of a high temperature cutoff valve. 1...Main body, 4...Water channel, 5...Hot water channel, 12a...Spout, 30...Operation handle (shower opening/closing handle), 37...Temperature sensor case (temperature sensing part) , 70... Lever handle (opening/closing handle for spout), 87... Shape memory alloy spring (temperature sensing part), A... Control valve, B... Opening/closing valve for shower, C... Opening/closing valve for spout, F ……
Mixed water flow path, H...High temperature cutoff valve.

Claims (1)

[Claims] 1. It has a hot water flow path, a water flow path, and a mixed water flow path where both of the above flow paths join together via a control valve that manually adjusts the mixing ratio of hot water and water, and is further opened and closed by a spout opening/closing handle. A spout on-off valve that is operated to supply mixed water to the spout and a shower on-off valve that is opened and closed by a shower on-off handle to supply mixed water to the shower are provided in the middle of the mixed water flow path, respectively. hand,
In the mixed water flow path downstream of the above-mentioned shower on-off valve or valve part and before the hose to the shower, there is a temperature sensing part that is sensitive to the temperature of the mixed water flowing down, and a temperature sensing part that is activated by the temperature sensing part to control the temperature of the mixed water. Equipped with a high-temperature shutoff valve that automatically opens and closes the flow path according to the
The high temperature shutoff valve has a check valve structure that closes by its own weight or urging force when water is not flowing, and further opens by the force of the mixed water flowing toward the shower side when the temperature is not high due to the operation of the temperature sensing part. A hot water mixing faucet characterized by having a valve that can be closed at high temperatures.