JPH0711341B2 - Water heater - Google Patents

Description

The present invention relates to a hot water supply device.

(Prior Art) Conventionally, in a hot water supply device, like a hot water storage type water heater, the hot water is heated only when the temperature of the hot water to be discharged falls below a set temperature, and the hot water is constantly discharged at the set temperature. There are things I tried to do.

(Problem to be Solved by the Invention) However, in such a configuration, since the set temperature is single as described above, hot water cannot be tapped at another set temperature different from the set temperature. This is
This means that it is not possible to selectively discharge hot water from a single hot water supply apparatus as described above at different set temperatures as necessary. Therefore, for example, when it is desired to lower or raise the temperature of the rinsing hot water in the middle of rinsing, such as in a dishwasher, it is not enough to supply hot water from the hot water supply device as described above. There is a defect.

On the other hand, it is conceivable to change the outlet heated water temperature under the control, but this causes a problem that the change of the outlet heated water temperature is slow and cannot be achieved quickly.

Therefore, in order to cope with such a situation, the present invention intends to quickly change the temperature of hot water to be supplied to any one of a plurality of desired temperatures different from each other in the hot water supply device to supply hot water. Is.

(Means for Solving the Problem) In solving the problem, the structure of the present invention has a hot water storage tank for storing hot water at a predetermined temperature, and an opposing end portion facing each other in the hot water in the hot water storage tank via a predetermined gap. A pair of pipes each of which extends outside the hot water storage tank, a water mixing valve connected to one of the pair of pipes outside the hot water storage tank, and the pair of pipes outside the hot water storage tank Of the electric pump connected to the other of the above.

(Effects) With the above configuration of the present invention, the hot water supply can be achieved by connecting the water mixing valve to the water supply source in advance and then operating the electric pump while the water mixing valve is closed. Hot water at a predetermined temperature in the tank flows out through the other pipe. When the water mixing valve is opened in this state, cold water from the water supply source flows through the one pipe into the predetermined gap in the hot water storage tank and mixes into the hot water in the predetermined gap. This lowers the temperature. Then, the electric pump causes the low temperature hot water in the predetermined gap as mixed water to flow out through the other pipe. In such a case, if the predetermined gap is properly determined,
The cold water flowing out from the one pipe always mixes only with the hot water in the predetermined gap, and the mixed hot water whose temperature is appropriately lowered instantaneously flows out through the other pipe. On the other hand, in this state,
When the water mixing valve is closed, the mixing of cold water into the predetermined gap is stopped, so that the hot water of the predetermined temperature in the hot water storage tank is kept at the same temperature under the operation of the electric pump. It flows out from the predetermined gap through the other pipe.

Therefore, when the hot water from the other pipe is supplied to, for example, the washing chamber of the dishwasher, by closing or opening the water mixing valve, the hot water at the predetermined temperature or a proper instant temperature reduction is achieved. The mixed hot water can be immediately supplied to the cleaning chamber at different times. Further, when the hot water from the other pipe can be selectively switched to be supplied to, for example, the washing chamber and the sink tank of the dishwasher, the predetermined temperature in the washing chamber is maintained while the water mixing valve is closed. It is possible to supply the hot water of No. 1 and to immediately supply the mixed hot water whose temperature is appropriately lowered as described above to the sink tank by opening the mixed water valve.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
The figure shows an example of a water heater according to the present invention, which is suitable for use in, for example, a dishwasher. This hot water supply device has a gas booster 50, and the gas booster 50 is connected to a hot water supply source or a water supply source by the pipe P ₃ . The gas booster 50 is supplied with hot water or water from the hot water supply source or the water supply source through the pipe P ₃ under pressure.
Keep heating at 65 ℃ or 85 ℃.

Further, the water heater has a pipe P ₇ , and this pipe P 7
At the downstream portion P _7b , ₇ is suspended in the gas booster 50 through its upper wall and penetrates into the hot water in the gas booster 50. Further, the pipe P ₇ extends in an L shape from the upper end of the downstream portion P _7b at the upstream portion P _7a , and is connected to the pipe P ₄ connected to the water supply source via the water mixing valve 80. There is. The mixed water valve 80 is composed of a normally closed solenoid valve, and the mixed water valve 80 opens the gas booster 50 through the pipes P ₄ and P ₇ to supply the cold water under pressure from the water supply source. Supply to.

The pipe P _8, at its upstream portion P _8a, which penetrates into shape vertically through the bottom wall of the gas booster 50 in the hot water in the gas booster 50, the upstream portion P _8a of the pipe P _8, the The upstream end P _8b coaxially _faces the downstream end P _7c of the pipe P _{7 with} a predetermined gap g. In such a case, the inner diameter of the upstream portion P _8a of the pipe P ₈ is larger than the inner diameter of the downstream portion P _7b of the pipe P ₇ . However,
No negative suction pressure is generated in the downstream end P _7c of the pipe P _{7 due to} the operation of the pump 40, and a gas booster 50 other than hot water in the predetermined gap g is provided.
The above-mentioned predetermined gap g is set so that the cold water from the downstream end P _7c of the pipe P ₇ is not mixed into the hot water inside and the low-temperature water mixture is quickly formed in the pipe P ₈ .

The pump 40 is interposed between the pipe P ₈ and the pipe P ₁ described above, and the pump 40 is driven by the motor of the pump 40 and the hot water or the mixed water in the predetermined gap g in the gas booster 50. Through the pipe P ₈ and the pipe P ₁ and pumped into the washing chamber of the dishwasher.

In the present embodiment configured as described above, if the pump 40 is driven by the motor with the water mixing valve 80 closed, the hot water (having 65 ° C. or 85 ° C.) in the gas booster 50 is piped by the pump 40. It is pumped out through P ₈ and pumped from the pipe P ₁ into the washing chamber of the dishwasher as washing water or rinsing water.

When the mixed water valve 80 is opened in such a state, the cold water from the water supply source passes through the pipe P ₄ , the mixed water valve 80 and the pipe P ₇ and flows out into the predetermined gap g from the downstream end P _7c thereof. Then, it is mixed with the hot water in the predetermined gap g to lower the temperature. Then the pump 40
But depending on the suction action, the drawn pipe P ₁ low temperature water (about 40 ° C. or 65 ° C.) as the mixing water hot water in a predetermined gap g from the upstream end P _8b in the pipe P ₈ of the pipe P ₈ It is pumped as wash water or rinse water into the washing room of the dishwasher.

In such a case, the predetermined gap g is properly determined based on the above-mentioned reason, so that the cold water flowing out from the pipe P ₇ is always mixed only in the hot water in the predetermined gap g and is instantly cooled as a mixed water. Inhaled into pipe P ₈ . Therefore, the pressure-fed mixed hot water into the washing room of the dishwasher immediately becomes appropriate low temperature hot water (65 ℃ → 40 ℃ or 85 ℃ → 65 ℃). It is possible to instantly switch and supply the appropriate hot water or rinse water at a high or low temperature. on the other hand,
When the mixed water valve 80 is closed while the mixed water is being pumped while the mixed water valve 80 is open, the inflow of cold water from the pipe P ₇ into the predetermined gap g is stopped. Therefore, the hot water in the gas booster 50 flows out from the predetermined gap g through the pipes P ₈ and P ₁ under the operation of the pump 40 at the same temperature. This means that the temperature of the hot water flowing out from the pipe P ₁ instantly rises. This means that, contrary to the above, it is possible to instantaneously switch the supply of low-high temperature wash water or rinse water. Incidentally, the opening / closing of the mixed water valve 80 and the stopping of the driving of the motor of the pump 40 may be performed by preparing an appropriate operation switch when stopping the supply of the electric power.

It should be noted that the embodiment of the present invention is not limited to the dishwasher alone, and can be used, for example, when hot water is selectively supplied to both the dishwasher and a think tank in the vicinity thereof. In such a case, according to the present invention, the temperatures of hot water supplied to both the dishwasher and the think tank can be instantly changed as needed.

Further, in carrying out the present invention, as compared with the pipe P ₇ described in the above embodiment, as shown in FIG.
You may add _7d and implement. In such a case, thin tube P
_7d, at its proximal end, which is fitted in the small holes projecting from the upper end wall portion of the downstream portion P _7b so as to face the tip portion of the horizontal portion P _7a of the pipe P _7, the thin tube P _7d Extends from the base end portion thereof in an inverted L shape and extends above the hot water in the gas booster 50 through the upper wall of the gas booster 50. However, thin tube P _7d
The inner diameter of the pipe is considerably smaller than the inner diameter of the pipe P ₇ .

As a result, when the mixed water valve 80 is closed and the pump 40 is stopped, cold water tends to remain in the pipe P ₇ in a filled state.
Since P _7d is open to the upper end portion of the downstream portion P _7b of the pipe P ₇ in the air in the gas booster 50, the majority of cold water in the pipe P ₇ is,
While injecting air from the _thin pipe P _7d into the pipe P ₇ , the air flows down the pipe P ₇ and flows out into the gas booster 50. Therefore, the residual cold water in the pipe P ₇ remains as a minimum amount only in the portion of the downstream portion P _7b located below the molten metal surface in the gas booster 50 and is heated by the hot water in the gas booster 50. Is maintained in a closed state.

Therefore, if the water mixing valve 80 is opened with the pump 40 stopped in such a state, the cold water from the water supply source pushes the air and the residual hot water in the pipe P ₇ into the gas booster 50, and the predetermined gap is maintained. flows out into g. Then, when the pump 40 is driven, only the appropriately mixed hot water in the predetermined gap g is supplied into the washing chamber of the dishwasher as described above. This means that it is possible to supply the mixed hot water whose temperature has been appropriately lowered at the same time as the driving of the pump 40 is started without the influence of the above-mentioned residual hot water in the pipe P ₇ .

In this case, since the base end of the _thin pipe P _7d is fitted to the upper end portion of the downstream portion P _7b of the pipe P ₇ as described above, the cold water flowing in the upstream portion P _7a of the pipe P ₇ is thin pipe P _7. After colliding with the base end portion of _7d , it will flow down into the downstream portion P _7b of the pipe P ₇ . Therefore, the inflow of air from the base end portion of the _thin pipe P _7d into the pipe P ₇ is reliably blocked by the collision of the cold water as described above, and the air is mixed in the mixed hot water flowing into the pipe P _8. Nothing.
Further, even if the cold water in the pipe P ₇ may partially flow into the _thin pipe P _7d , the cold water flowing into the _thin pipe P _7d may flow into the _thin pipe P _7d .
_{Since the} gas flows into the gas booster 50 from the downstream end of _7d , the cold water is not wasted and the periphery of the gas booster 50 is not wet with the cold water. The _thin tube P _7d is omitted, and the thin tube P
Even if only the small hole of the pipe P ₇ into which the base end portion of _7d is fitted is used, it is possible to achieve substantially the same effects as the above.

Further, in implementing the present invention, the facing direction of both pipes P ₇ and P _{8 in} the gas booster 50 may be changed to an arbitrary direction.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG.
The drawing is a schematic configuration diagram showing a partially modified example of the embodiment. Explanation of symbols P ₁ , P ₃ , P ₄ , P ₇ , P ₈ ... Piping, 40 ... Pump, 50 ... Gas booster, 80 ... Water mixing valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Suyama 3-16, Hoshizaki, Sakaemachi South Building, Toyoake City, Aichi Prefecture Hoshizaki Electric Co., Ltd. In-house (72) Inventor Osamu Nagata 16 16 Hoshizaki Electric Co., Ltd. 3rd South Building, Sakaemachi, Toyoake City, Aichi Prefecture

Claims (1)

[Claims] 1. A pair of pipes each having a hot water storage tank for storing hot water of a predetermined temperature and an opposite end portion facing each other in a predetermined gap in the hot water in the hot water storage tank and extending outside the hot water storage tank. And a water mixing valve connected to one of the pair of pipes outside the hot water storage tank, and an electric pump connected to the other of the pair of pipes outside the hot water storage tank.