JPH06105110B2 - Fluid switching valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluid switching valve that switches a discharge destination of hot water between a shower side and a bath side, for example.

2. Description of the Related Art Conventionally, there is no switching valve having a means for preventing the risk of burns due to discharge of high-temperature water due to malfunction of a heat source device that supplies hot water when using a shower or a hot and cold water mixing tap, or erroneous operation. However, as shown in FIG. 1, there is a device in which a high temperature shutoff valve 2 is provided in the shower side flow passage 1 and the flow passage is automatically closed when the discharge hot water temperature exceeds a certain temperature. (For example, Japanese Unexamined Patent Publication No. 60-40874) Problems to be Solved by the Invention However, in the above-described configuration, once the high temperature shut-off valve 2 is closed due to an erroneous operation, the discharge of hot water is stopped. However, in order to use it again, there is a problem in that the shower side cannot be used with the shower side closed even if the bath side is opened and the hot water returns to a normal temperature because the shower side flow path 1 has to wait for heat radiation. Occurs. Further, when the hot water is completely closed, the water shutoff pressure is directly applied to the high temperature shut-off valve 2 and the durability becomes a problem.

The present invention solves such a conventional problem, and when the hot water reaches a temperature higher than the regulation for some reason during the shower discharge, the shower discharge is automatically switched to the bath discharge,
It is an object to provide a fluid switching valve that has excellent durability and is easy to use.

Means for Solving the Problems In order to solve the above problems, the fluid switching valve of the present invention includes a hot water inflow path, a first flow path that does not allow the supply of high temperature water, and a supply of high temperature water. The second flow path, the temperature sensing portion sensitive to the temperature of the hot water, and the discharge destination of the hot water to the first flow path and the second flow path.
, The first channel is closed when hot water is not being supplied, the second channel is opened, and switching to the first channel is maintained by fluid pressure due to the switching operation during hot water supply. However, when the discharge temperature exceeds a certain specified temperature during discharge of the first flow path, the fluid pressure is lowered by connecting the inflow path and the second flow path by interlocking with the temperature-sensing section. And a switching valve that automatically switches from discharge to discharge in the second flow path.

With the above-described configuration, the present invention starts hot water supply from the second flow path at the start of hot water supply, and prevents the user from unknowingly supplying hot water from the first flow path. When the hot water reaches or exceeds the specified temperature for some reason when using the flow path of, the switching valve automatically operates and the discharge destination is the second
The flow path is switched to the one that prevents burns from being exposed to high-temperature water.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, there are an inflow path 3, a bus-side flow path 4 that is a second flow path, and a shower-side flow path 5 that is a first flow path.
The openings facing the two flow paths 4 and 5 from the inflow path 3 are provided so as to face each other, and the bath side valve seat 6 and the shower side valve seat 7 are provided, respectively.
The switching valve body 10 connected to the switching knob 8 via the shaft 9 is provided between the two valve seats 6 and 7. The bath-side flow path 4 allows the supply of high-temperature water, but the shower-side flow path 5
Does not permit the supply of high-temperature water, the shower-side flow passage 5 is closed by the valve body 10 and the bath-side flow passage 4 is opened when hot water is not supplied. Therefore, at the start of hot water supply, hot water is always supplied from the bath-side flow path 4 to prevent sudden hot water supply from the shower. When the valve body 10 is lifted against the spring by the switching operation by the switching knob 8 while hot water is being supplied, the resistance of the flow path on the shower side is high.
It is possible to switch to the shower side channel by fluid pressure. When it is pulled up, the switching valve body 10 contacts the bath side valve seat 6, and hot water is discharged from the open shower side flow path 5. Further, when the switching knob 8 is pushed downward, the switching valve body 10 contacts the shower side valve seat 7, and hot water is discharged from the open bath side flow path 4. Further, a temperature sensing body case 12 forming a temperature sensing portion 11 in which wax is enclosed is fixed to the switching valve body 10 below the switching valve body 10 (on the side facing the shower side flow path 5), and It has a projecting shaft 13 that can project and retract in the axial direction by thermal expansion and contraction. A pilot valve 15 that comes into contact with an emergency opening 14 provided at an upper portion of the switching valve body 10 (a side facing the bus-side flow path 4) is provided at the tip of the protruding shaft 13, and the pilot valve 15 is an urging spring. It is urged by the direction 16 to close the emergency opening 14. Further, the switching valve body 10 is also biased by the switching valve biasing spring 17 in the direction of coming into contact with the shower side valve seat 7.

With the above configuration, when the switching knob 8 is pulled upward, that is, when hot water is being discharged to the shower side, the temperature of the hot water rises for some reason and exceeds a certain specified temperature. The wax in the case 12 expands, the protruding shaft 13 extends, and the pilot valve 15 is pushed by it and the pilot valve 15 biases the spring.
When the hot water flowing from the emergency opening 14 to face the shower head 16 and flowing from the shower side flow path 5 also starts to flow to the bath side flow path, and the pressure difference between the inflow path 3 and the bus side flow path 4 becomes small, switching is performed. The switching valve body 10 is pushed down by the valve biasing spring 17, the shower side flow path 5 is closed, and hot water is discharged from the bath side. That is, as soon as a high temperature is likely to be discharged due to some factor when using the shower, the fluid pressure is lowered by the temperature sensing unit 11 and the switching valve is automatically switched to the discharge on the bath side to prevent the risk of bathing high temperature water. It is a thing. In addition, the switching valve body 10
Is configured to be urged by the switching valve urging spring 17 in the direction of coming into contact with the shower-side valve seat 7, and therefore, when hot water is again supplied after the hot water is stopped, it is always discharged from the bath side, and the shower is abruptly changed. It is safe and will not be bathed.

Effects of the Invention As described above, according to the fluid switching valve of the present invention, the following effects are obtained.

(1) At the time of discharging the first flow path, if the discharge temperature exceeds a certain specified temperature, the temperature-sensing portion works to change the discharge from the first flow path to the second temperature.
The hot discharge is transient by automatically switching to the discharge of the second flow path to prevent high-temperature water from being supplied from the first flow path and switching to the second flow path to continue hot water supply. This makes it easier to recover after the temperature sensor has worked, such as when.

(2) At the start of hot water supply, supply of hot water from the second flow path is started, and to the first flow path that does not allow the supply of high-temperature water, the operation after the start of hot water supply starts from the second flow path. Since it is possible to switch between the two, even if the temperature sensing part fails, high water is prevented from being supplied from the first flow path at the start of hot water supply, and double safety can be achieved. By maintaining the switching to the flow path and applying a force greater than the fluid force, the switching to the second flow path can be performed manually even in the unlikely event.

[Brief description of drawings]

FIG. 1 is a sectional view of a fluid switching valve according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional shower-side high temperature cutoff valve. 3 ... inflow path, 4 ... bath side flow path, 5 ... shower side flow path, 10 ... switching valve body, 11 ... temperature sensing part.

Claims (1)

[Claims] 1. A hot water inflow path, a first flow path that does not allow the supply of high-temperature water, a second flow path that allows the supply of high-temperature water, and a temperature-sensing section that is sensitive to the temperature of the hot water. Hot water is supplied to the first flow path and the second flow path, and when the hot water is not supplied, the first flow path is closed and the second flow path is opened to supply hot water. The switching operation to the first flow path is maintained by the fluid pressure by the switching operation of, and when the discharge temperature exceeds a certain specified temperature at the time of discharging the first flow path, the temperature is sensed in conjunction with the temperature sensing unit. A fluid switching valve comprising: a switching valve that connects an inflow channel and the second channel to reduce a fluid pressure and automatically switches from discharge of the first channel to discharge of the second channel.