JPH071066B2 - Hot water prevention device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot water prevention device capable of effectively blocking inflow or outflow of hot water at a predetermined temperature or higher, and more specifically, a hot and cold water common faucet. The present invention relates to a hot water prevention device that is effective when applied to prevent the inflow of hot water into a water purifier or the like attached to a room or prevent the outflow of hot water from a shower or the like.

[Conventional technology]

As a hot water prevention device for preventing abnormal inflow and outflow of hot water, the one that consists of a valve mechanism that uses a shape memory alloy as a drive source of the valve body is an air conditioner, a temperature control valve, a drain trap valve of a steam trap, etc. In these cases, a shape memory alloy with two-way memory is used, or a spring made of a shape memory alloy with one-way memory is combined with a bias spring for releasing the cutoff state. Things are used.

[Problems to be Solved by the Invention]

However, when a spring made of a shape memory alloy of two-way memory is used as described above, it is difficult to process the spring, there is a problem in output characteristics during driving, and the cost is high. When a bias spring is combined with a spring made of a shape memory alloy of one-way memory, the strength of the spring made of a shape memory alloy when driving the valve body and the strength of the bias spring when returning the valve body are There is a problem that it is difficult to adjust the balance to an appropriate relationship, and therefore the hot water prevention device cannot be operated accurately. It should be noted that it is conceivable to provide an adjusting mechanism for appropriately adjusting the relationship between the strengths of both springs, but in this case,
Another problem arises in that the structure of the entire hot water prevention device becomes complicated and becomes large in size.

Therefore, an object of the present invention is to provide a hot water preventive device which uses a one-way memory shape memory alloy as a drive source of a valve element and has a simple structure and which can accurately perform the operations of shutting off and releasing the hot water flow. To provide.

[Means for Solving the Problems]

The present invention uses the shape restoring force of the shape memory alloy 311 to make the valve body 309
There is a hot water prevention device that presses against the valve seat 306 to shut off the hot water flow, and presses the valve element 309 after the shutoff operation in the direction opposite to the shutoff operation direction and moves the valve element 309 to the position before the shutoff operation. A blocking release mechanism having a protrusion 312 for pushing back is provided,
Further, the hot water prevention device is provided with a water flow switching valve mechanism provided with the cutoff release mechanism, and the protrusion 312 is
It is provided in the valve body 305 of the water flow switching valve mechanism, and is pushed back to the position before the shut-off operation by moving the valve body 305 in the direction of the valve body 309 when switching the water flow. The above object is achieved by providing a hot water prevention device.

[Action]

According to the present invention, since hot water at a predetermined temperature or higher flows into the hot water prevention mechanism and at the same time the shape memory alloy restores to the high temperature shape, the restoring force at that time presses the valve body against the valve seat. As a result, it is possible to block the inflow and outflow of hot water to and from other devices / appliances to which it is applied, and the valve body can be pushed back by the protrusions after blocking, so that the heat can be quickly released. The water protection device can be returned to a usable state. Therefore, the hot water prevention device of the present invention is attached to another device / appliance to prevent (block) hot water inflow to or out of the device / appliance and release it. You can

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a case where a hot water prevention device according to an embodiment of the present invention is applied to a water purification device which is an example of an application target.

Prior to specifically describing the hot water prevention device of the present embodiment,
The water purification device to which the application is applied will be described.

The water purifying device is a faucet-mounting type water purifying device whose main body is composed of a water purification cartridge 1 and a block base 2 to which the water purification cartridge 1 is attached.
An arm-shaped introduction member 3 is connected to the block base 2 and is connected to a faucet (water pipe) 4 at a water tap connection portion 301 provided near the end of the introduction member 3. .

The introduction member 3 located below the water tap connection portion 301
A raw water outlet 303 is provided in the lower part of the, and a switching valve provided between the two directs the water flow from the tap water in either the direction of the flow path 302 or the direction of the raw water outlet 303. It is configured to be switched (304 in the drawing is a discharge pipe).

The switching valve is composed of a valve element 305 and a valve seat 306,
By turning the knob 307 attached to the end,
The gap between the valve body 305 and the valve seat 306 can be adjusted.

The hot water prevention device of the present embodiment is incorporated in the above-mentioned introduction member 3 and forms a part of the introduction member, and the switching valve (mechanism) is continuously provided in the hot water prevention device. ing.

That is, the hot water prevention device is provided on the apparatus main body side adjacent to the switching valve, the hot water prevention valve body 309 oriented in the opposite direction to the valve body 305, and the valve body. A valve seat 306 on which 309 is pressed, a support member 310 having a central hole through which the valve shaft of the valve body 309 is inserted, and having four claw portions in the periphery, the support member 310 and the hot water prevention device. A hot water prevention mechanism is provided between the valve body 309 and a coil-shaped shape memory alloy 311 around which the valve shaft is wound. And the valve body
At the tip of 305, there is a protrusion for pushing back the valve element 309.
312 is provided and is also shown in the cross-sectional view of FIG. This shape memory alloy 311 is configured to restore its original shape (in a high temperature state) when it comes into contact with hot water at a predetermined temperature or higher, and press the valve body 309 against the valve seat 306 by the restoring force at that time. ing. A rubber member 308 is attached to the hot water prevention valve body 309.

Incidentally, in order to make the structures of the switching valve and the hot water prevention mechanism described above easier to understand, respective members positioned inside the introducing member 3 constituting them are shown in the exploded perspective view of FIG.

Next, the operation of this embodiment will be described. In the figure, the flow of water is indicated by an arrow.

First, the tap water is opened, and the knob 307 is further rotated to switch the flow of raw water (tap water) to the flow path 302 side, that is, the apparatus main body side, whereby the raw water can be sent to the raw water supply section 21. At that time, if hot water accidentally flows into the introducing member 3, when the hot water comes into contact with the shape memory alloy 311, the hot water prevention valve body 309 is immediately moved to the right in the figure by the restoring force of the alloy 311. Is driven to close the gap between the hot water prevention valve body 309 and the valve seat 306, so that further inflow of hot water is blocked. Therefore, hot water is effectively prevented from flowing into the main body of the apparatus. It should be noted that FIG. 1 shows a state after the hot water prevention mechanism is activated for convenience.

After the hot water prevention mechanism operates as described above, in order to return to the original usable state, wait for the inflowing hot water to cool, turn the knob 307, and move the valve body 305 of the switching valve to the left in the figure. The valve body 305, the hot water prevention valve body 309 is forcibly retracted by the protrusion 312 provided on the valve body 305, and a gap is formed between the hot water prevention valve body 309 and the valve seat 306. By forming the, the cutoff state can be released and the hot water prevention device can be quickly returned to the usable state. The cutoff state can be released by the water pressure of the tap water without pressing the valve body 309 with the protrusion 312 as described above. When the water pressure is used to release the cutoff state as described above, the protrusion 312 is not necessary.

The hot water prevention mechanism that constitutes the hot water prevention device of this embodiment starts operating when the temperature of the raw water flowing into this mechanism starts at about 40 ° C., and when the temperature of the raw water flowing into this mechanism reaches 60 ° C. It is designed to be fully operational. However, this temperature setting is only an example, and an arbitrary temperature can be set.

The hot water prevention mechanism in this embodiment also operates as a check valve when low temperature water is used. That is, when low-temperature water is flowing in, since the shape memory alloy has no proof stress, the shape-memory alloy is pushed back by the water pressure of the incoming low-temperature water in use.
When the water pipe side is depressurized, the hot water prevention valve body 309 is biased toward the valve seat 306 side, and the gap between the two is closed, so that it also functions as a check valve.

Although the present invention has been specifically described based on the embodiments, it goes without saying that the water purifying apparatus of the present invention is not limited to the ones shown in the embodiments.

For example, if the hot water prevention mechanism is equipped with a valve mechanism that uses a shape memory alloy as a drive source, the type of valve
Needless to say, the shape and the like can be arbitrarily changed, and therefore, the specific shape of the shape memory alloy is not limited to the coil shape, and can be arbitrarily changed as long as it can press the valve body when restoring the shape. It is a thing.

Further, in the embodiment, the cutoff release mechanism is constituted by the switching valve, and the projection is provided at the tip of the valve body, but the invention is not limited to this, and the projection is mechanically moved back and forth. Any mechanism may be used as long as it is capable of reliably pressing the hot water prevention valve body with the protrusion, and specifically, a simple screw member, and the tip of the member is It may be a protrusion.

Further, the installation position of the hot water prevention device is not particularly limited to that of the embodiment, and if it is a position that can substantially prevent hot water from flowing into the device body, particularly the water purification cartridge, the inside of the block base. May be

Further, although the faucet mounting type is shown as the water purifying device to which the hot water prevention device is applied, the present invention may be applied to a stationary water purifying device connected to the faucet via a hose. There is no end.

Further, in the embodiment, an example in which the hot water prevention device is formed continuously and integrally with the introduction member is shown, but the hot water prevention device is configured as an independent device member that is detachably attached to the introduction member. May be

The case where the hot water prevention device of the present invention is applied to the water purification device has been described in detail above, but the device / appliance to which the hot water prevention device of the present invention is applicable is not limited to the water purification device. , Shower, hand wash, toilet cleaning equipment, etc.
Inflow of hot water of a certain temperature or higher into equipment may cause damage or deterioration, or inflow of hot water from equipment or equipment may cause burns to the human body or damage other products or parts. Etc. can be applied to various devices and instruments. Therefore, the temperature of the hot water operated by the hot water prevention device of the present invention is also arbitrarily changed according to the object to which the hot water prevention device is applied.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The hot water prevention device of the present invention uses a shape memory alloy of one-way memory as a drive source of the valve element, has a simple structure, and can accurately perform the operation of shutting off and releasing the hot water flow. Therefore, by applying the hot water prevention device to a device / apparatus such as a water purifying device, even when hot water is introduced into the device / appliance, the hot water flows into the device / appliance, or Since hot water can be prevented from flowing out from the device / appliance, damage or deterioration of the device / appliance due to hot water can be prevented in advance, and the device / appliance is used. It is possible to ensure safety in the case.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a hot water prevention device according to an embodiment of the present invention together with a water purification device to which the hot water prevention device is applied.
FIG. 3 is an exploded perspective view for explaining the hot water prevention device of the above embodiment, and FIG. 3 is a sectional view showing an example of the hot water prevention valve body in the above embodiment. 1 ... Water purification cartridge 2 ... Block base, 3 ... Introducing member 21 ... Raw water supply part, 104 ... Inlet port 301 ... Water tap connection part, 302 ... Flow path 303 ... Raw water outlet part, 305 …… Valve 306 …… Valve seat, 307 …… Knob 309 …… Hot water prevention valve, 310 …… Supporting member 311 …… Shape memory alloy, 312 …… Protrusion

Continuation of the front page (56) References JP-A-60-40874 (JP, A) JP-A-62-228776 (JP, A) Actual development Sho-59-62370 (JP, U)

Claims (1)

[Claims] 1. The valve body 3 is formed by the shape restoring force of the shape memory alloy 311.
A hot water prevention device that presses 09 against the valve seat 306 to shut off the flow of hot water, and presses the valve element 309 after the shutoff operation in the direction opposite to the shutoff operation direction and moves the valve element 309 to the position before the shutoff operation. Is provided with a cutoff release mechanism having a protrusion 312 to be pushed back to, and the hot water prevention device is continuously provided with a water flow switching valve mechanism having the cutoff release mechanism, and the protrusion 312 is The heat is provided in the valve body 305 of the water flow switching valve mechanism, and pushes the valve body 309 back to the position before the shutoff operation by moving the valve body 305 in the direction of the valve body 309 when switching the water flow. Water prevention device.