JPH0448412Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention mixes hot water supplied from a water heater that uses gas, oil, or solar heat as a heat source with water supplied from a tap, etc. The present invention relates to a water heater that can obtain hot water at an appropriate temperature.

[Conventional technology] When a constant-temperature water heater or the like that uses gas as a heat source is installed outdoors, and the hot water supplied from it is led indoors through hot water pipes, when hot water starts to be dispensed, the inside of the hot water pipes on the way is used. is water, and hot water will not come out of the faucet until all the water has drained out. Even if the water heater is installed indoors, a similar problem occurs if the faucet is located far away.

Conventionally, an auxiliary tank was installed in the vicinity of the faucet and inserted in series in the middle of the hot water supply pipe to constantly heat and store a small amount of hot water using electricity.

According to this conventional device, when the faucet is opened, the hot water in the auxiliary tank and the water in the hot water supply pipe are first mixed to obtain hot water at the appropriate temperature, and by the time the hot water in the auxiliary tank runs out, the water heater is turned off. Hot water comes out. Therefore, even if the water heater is installed in a remote location, there is an advantage that hot water can be obtained from the beginning of use.

[Problems to be Solved by the Invention] The conventional water heater described above has the above-mentioned advantages when hot water is stored in the auxiliary tank. However, if the heat source of the auxiliary tank is turned off because the manager is out or for other reasons, water will remain in the auxiliary tank. Therefore, when you open the faucet in this case, hot water will not come out until both the water in the hot water supply pipe and the water in the auxiliary tank have come out, and it will take a long time for hot water to come out from the faucet. The major drawback was that it was time consuming.

The object of this invention is to provide a water heater that does not cause such inconvenience when water is in the auxiliary tank.

[Means for Solving the Problems] The water heater of the present invention to solve the above-mentioned problems has a hot water supply pipe connected to a hot water outlet of a hot water supply source, and a water supply pipe branched from the hot water supply pipe to heat hot water. An auxiliary hot water supply pipe with an auxiliary tank for storage inserted in the middle, a water supply pipe connected to a water supply source, and the outlet of one of these three pipes, or the outlet of the hot water supply pipe and the above water supply pipe. a switching valve that selectively connects an outlet of an auxiliary hot water supply pipe, or an outlet of the auxiliary hot water supply pipe and an outlet of the water supply pipe simultaneously, to a common discharge pipe;
A temperature sensor detects the hot water temperature θ ₁ in the hot water supply pipe near the branch, the hot water temperature θ ₂ in the auxiliary tank, and the hot water temperature θ in the discharge pipe, and adjusts the water temperature in the discharge pipe to a desired set temperature θ _s. The hot water temperature setting device is characterized by comprising a hot water temperature setting device, and a valve control means for controlling the operation of the switching valve according to output signals from the temperature sensor and the hot water temperature setting device.

[Operation] The operation of the switching valve is controlled according to the temperature of the hot water in the hot water pipe θ ₁ , the hot water temperature in the auxiliary tank θ ₂ , the hot water temperature in the discharge pipe θ, and the set temperature θ _s. , the hot water or water in the auxiliary hot water pipe and the water supply pipe are mixed in an appropriate ratio by a switching valve, or only one of the hot water or water in these three pipes is selected according to the control and passed through the discharge pipe. Take a bath.

[Example] An example of the present invention will be described based on the drawings.

FIG. 1 is a schematic diagram showing the overall configuration of this water heater. For example, a hot water supply pipe 2 is connected to a hot water outlet 1a of a hot water source 1, which is a constant temperature water heater using a gas boiler as a heat source.
An auxiliary hot water supply pipe 3 branches from the hot water supply pipe 2 near the outlet 2a of the hot water supply pipe 2. 3b is its branch. An auxiliary tank 4 is inserted in series in the middle of the auxiliary hot water supply pipe 3 to heat and store hot water using an electric heater. The amount of hot water stored in this auxiliary tank 4 is, for example, 2 to 3
The output of the electric heater used therein is, for example, about 50 to 100 W, and the hot water in the auxiliary tank 4 is maintained at, for example, about 60 to 80°C.

5 is a water supply pipe connected to a water source such as a water supply or a well, and includes a hot water supply pipe 2, an auxiliary hot water supply pipe 3, and a water supply pipe 5.
Each outlet 2a, 3a, 5a of
It is connected to the book discharge pipe 7. 8 is a faucet provided at the end of the discharge pipe 7, and by twisting a knob 8a, a valve body provided in the faucet 8 is opened and closed.

9 is a motor with a speed reduction device (valve driving means) that drives the switching valve 6, and 10 is a control circuit that controls the operation of the motor 9.

11, 12, and 13 respectively detect and detect the hot water temperature θ ₁ in the hot water supply pipe 2 immediately before the branch portion 3b, the hot water temperature θ ₂ in the auxiliary tank 4, and the hot water temperature θ in the discharge pipe 7. It is a temperature sensor provided to output an electrical signal corresponding to the water temperature, and 14 is a water temperature setting device that sets the temperature θ _s of the hot water coming out of the faucet 8 and outputs an electrical signal corresponding to the set value. , this temperature sensor 1
1, 12, 13 and a hot water temperature setting device 14 are each connected to the control circuit 10, and each electric signal is input to the control circuit 10.

FIG. 2A is a sectional view of the vicinity of the switching valve 6. Second
Figure B is a sectional view taken along the line B-B.

The switching valve 6 is a cylindrical valve with a hole 6a formed in its peripheral wall, and is rotatably fitted into the discharge pipe 7. The inner hole 6i of the switching valve 6 is always in communication with the discharge pipe 7. And the outlet 2a of the hot water pipe
and the outlet 3a of the auxiliary hot water pipe and the outlet 5a of the water supply pipe.
and each with the outlet 3a of the auxiliary hot water pipe in the middle.
It is connected to a discharge pipe 7 from the outside facing the switching valve 6 at a 90 degree angle.

Therefore, when the switching valve 6 is rotated about its axis, the hole 6a sequentially communicates with the hot water supply pipe outlet 2a, the auxiliary hot water supply pipe outlet 3a, and the water supply pipe outlet 5a. The hole 6a has three outlets 2a, 3a, 5
When directly facing and communicating with one of the outlets a, it does not communicate with the other two outlets. Therefore, by rotating the switching valve 6 around its axis, the hot water supply pipe 2,
Three pipes, the auxiliary hot water pipe 3 and the water supply pipe 5, can be selectively connected to the drain pipe 7.

2B, 61 and 62 are O-rings for sealing, and 63 is a retaining lid for preventing the switching valve 6 from coming out of the drain pipe 7. Also,
Reference numeral 64 denotes a rotating shaft whose one end is fixed to the center axis of the switching valve 6, and is rotated by a predetermined angle by the motor 9 from the other end.

In the state shown in FIG. 2A, the hole 6a of the switching valve 6
is in communication only with the outlet 3a of the auxiliary hot water supply pipe, so that only the hot water in the auxiliary hot water supply pipe 3 flows from the hole 3a through the switching valve 6 to the discharge pipe 7. By rotating the switching valve 6, as shown in [1] and [3] in FIG. 7 or as shown in [1.5] of Figure 3, the outlet 2a of the hot water pipe
and the outlet 3a of the auxiliary hot water supply pipe are connected to the discharge pipe 7 at the same time, or as shown in [2.5] in Fig. 3,
The outlet 3a of the auxiliary hot water supply pipe and the outlet 5a of the water supply pipe are connected to the discharge pipe 7 at the same time.

FIG. 4 shows the configuration of the control circuit 10.

20 is a group of contact pieces made of a conductive material formed on a fixed part around the drive shaft that drives the switching valve 6; 31 and 32 rotate integrally with the switching valve 6, and each of the contacts This is a brush that comes into contact with the group of pieces 20 and brings electrical continuity between the contact pieces that are in contact with each other.
In contrast, the contact piece group 20 may be provided on the drive shaft side of the switching valve 6 and rotated, and the brushes 31 and 32 may be provided on the fixed portion side of the device.

In this way, the contact piece group 20 and the brushes 31, 3
2 is such that the mutual positional relationship changes as the switching valve 6 rotates, and the numbers [1] to [3] in FIG. It represents the position of . For example, when the brush is in position [1], hot water pipe 2
It is in the state shown in Fig. 3 [1] where only the pipe is connected to the discharge pipe 7, and [1] to [3] in Fig. 4 are
This corresponds to states [1] to [3] in FIGS. 2A and 3.

The contact piece group 20 includes a full width contact piece group 20a spanning the entire length between positions [1] and [3] (180 degrees in rotation angle of the switching valve 6) in FIG. Short (about 85 degrees at the rotation angle of the switching valve 6) half-width contact piece group 20
It consists of b. The half-width contact piece group 20b consists of a pair of parallel contact pieces 23 and 24 provided in parallel, and the parallel contact pieces 23 and 24 are electrically connected only when the brush 32 is between [1] and [2]. It's getting old. Note that there is no conduction at the position [2].

The full-width contact piece group 20a includes [1] to [3] a slender contact piece 25 formed over the entire length, a left end contact piece 26 and a right end contact piece at both ends, 27, [1] to [2].
Left half contact piece 28 formed between [2] to [3]
It consists of a right half contact piece 29 between. And each contact piece 2
The gaps between 6 to 29 are each formed in an L-shape, and since the brush 31 has three contact points as shown in the figure, the brush 31 is connected to the elongated contact piece 25 and any of the other contact pieces 26 to 29. is always conductive. At the L-shaped boundary between the contact pieces, the brush 31 is connected to the contact pieces on both sides of the boundary (for example, the right end contact piece 27 and the right half contact piece 2).
9) at the same time, so that there is no moment of conduction breakage at the boundary.

Further, diodes 33, 34, and 35 are connected between adjacent contact pieces 26 to 29 so that current can flow only from the right contact piece to the left contact piece.

36 is a temperature comparison circuit, which is connected to the hot water temperature setting device 1.
4 (hot water temperature _θs ) and the signal (hot water temperature θ) from the temperature sensor 13 provided in the discharge pipe 7, and output a signal corresponding to the result from output terminals p and q. It is something to do. That is, when θ>θ _s , p
A signal of ``0'' is output from q and a signal of ``1'' is output from q. Conversely, when θ<θ _s , a signal of ``1'' is output from p and a signal of ``0'' is output from q. When θ=θ _s , both p and q output “0” signals.

The output terminals p and q of the temperature comparison circuit 36 are forward and reverse.
It is connected to input terminals a and b of IC 37, and between them, NOT circuits 38 and 39 and resistors 40 and 4 are connected respectively.
1 are connected in series. In addition, the above forward/reverse
The output end d of the IC 37 is connected to the elongated contact piece 25, and the motor 9 is connected in series therebetween, and the output end c of the forward/reverse rotation IC 37 is connected to the right half contact piece 29. 42 is a DC power supply.

The above-mentioned forward/reverse IC 37 is a known one, and when a signal of "1" is input to the input terminal a and "0" to the input terminal b, the output terminal c becomes the H level potential, and the output terminal d becomes the L level potential.
A current flows through the motor 9 in the direction of arrow I, causing the motor 9 to rotate forward, and the switching valve 6 to rotate in the direction [1]→[3]. And along with that, brushes 31, 32
moves in the direction of arrow D with respect to the contact piece group 20. Conversely, when a signal of "0" is input to input terminal a and "1" is input to input terminal b, the motor 9 rotates in the opposite direction, and the switching valve 6 rotates in the direction [3] → [1], and the brush 3
1 and 32 move in the direction opposite to the arrow D with respect to the contact piece group 20. When input terminals a and b are both "1", output terminals c and d both have an L level potential, and the motor is braked and stopped. The structure of the forward/reverse IC 37 is described in, for example, Japanese Utility Model Application Publication No. 61-58860, so a description thereof will be omitted.

43 is a signal generator, into which a signal (hot water temperature θ ₁ ) from the temperature sensor 11 provided in the hot water supply pipe 2 and a signal (hot water temperature θ ₂ ) from the temperature sensor 12 provided in the auxiliary tank 4 are input. , outputs a signal x according to the input signal. In other words, when θ ₁ ≦ θ ₂ , the signal is “1”
is output (x=1), and when θ ₁ > θ _2, the signal is “0”
is output (x=0).

The output terminal of the signal generator 43 is connected to the base of a first transistor (hereinafter referred to as "Tr ₁ ") 44,
It is connected via a NOT circuit 45 and a resistor 46a, and is also connected to one of the parallel contact pieces 24. The collector of the Tr ₁ is connected to the left half contact piece 28, the emitter is connected to the output terminal c of the forward/reverse IC 37, and a resistor 46b is connected between the emitter and the base.

On the other hand, the other parallel contact piece 23 is the second contact piece,
It is connected to the respective bases of third transistors (hereinafter referred to as "Tr ₂ " and "Tr ₃ ") 47 and 48, and is grounded via a resistor 49. And Tr ₂ 47
The collector of Tr ₃ 48 is connected to the high potential part of the circuit, and the emitter is connected to the input terminal a of the forward/reverse IC 37.
The collector of is connected to the input end b of the forward/reverse IC 37, and the emitter is grounded. 50 is Tr ₃ 48
is a resistor connected to the base of . Each resistor in this circuit is provided to create a potential difference across the resistor when energized.

Since each transistor is connected as described above, when the signal generator 43 outputs a signal of x=1, both Tr ₂ 47 and Tr ₃ 48 are turned ON, and the output signal from the temperature comparison circuit 36 is Regardless of this, the input terminal a of the forward/reverse rotation IC 37 is always "1", the input terminal b is "0", and the motor 9 rotates in the normal direction. However, since the parallel contact pieces 23 and 24 are formed only between [1] and [2], the brush 32 is between [2] and [3].
When they are in between, the parallel contact pieces 23, 24 and the brush 32 are disconnected, and Tr ₂ 47 and Tr ₃ 48
becomes OFF. That is, this circuit operates so that the brushes 31 and 32 do not move to the left of [2] in FIG. 4 when x=1. On the other hand, the output signal of x=1 from the signal generator 43 is output from the NOT circuit 4.
5, it becomes "0" and is output, and Tr ₁ 44 is turned off.

Conversely, when the signal generator 43 outputs a signal of x=0, both Tr ₂ 47 and Tr ₃ 48
It becomes OFF and becomes the same as not existing, while
Tr ₁ is turned ON, and the output terminal c of the forward/reverse rotation IC 37 and the left half contact piece 28 are connected.

Next, the operation of the above embodiment will be explained.

When the hot water temperature θ in the discharge pipe 7 is higher than the set temperature θ _s , that is, when θ>θ _s , a signal of “0” is output from the output terminal p of the temperature comparison circuit 36, and a signal of “1” is output from the output terminal q. The signal is inverted by the NOT circuits 38 and 39, and the input terminal a of the forward/reverse IC 37 becomes "1" and the input terminal b becomes "0".
signal is input. Therefore, the motor 9 rotates in the normal direction, and the switching valve 6 rotates in the [1]→[3] direction.
That is, the brushes 31 and 32 move to the right in FIG. In this case, the brush 31 is connected to the left end contact piece 26,
Regardless of the position of the left half contact piece 28 and the right half contact piece 29, current flows in the forward direction through the diodes 33 and 34, so the motor 9 rotates normally and the brush 31 moves in the direction of arrow D. When the brush 31 reaches the right end contact piece 27, no current flows through the diode 35, so the motor 9 stops there (ie, at position [3]).

Conversely, when θ<θ _s , the motor 9 rotates in reverse, and the brushes 31 and 32 move to the left in FIG. In this case, since a current flows in the diode 35 in the forward direction, the brush 31 moves from the right end position [3] to the position [2]. and signal generator 43
When the output signal from x=0, Tr ₁ 44 is
ON, Tr ₂ 47 and Tr ₃ 48 are turned OFF, and the output terminal c of the forward/reverse IC 37 is connected to the left half contact piece 28, so the brush moves further to the left to the left end contact piece 26. When the output signal from the signal generator 43 is x=1, it stops at the position [2].

By the way, when this apparatus has not been used for a while, the temperature θ of the hot water in the discharge pipe 7 has decreased, and normally it always becomes lower than the set temperature θ _s . That is, θ<θ _s . Therefore, the motor 9 rotates in reverse, and the switching valve 6 rotates in the direction opposite to arrow D. If the signal generator 43 does not output an output signal of x=1, the switching valve 6 is stopped at the position [1]. This is a very important element when considering the operation of this device.

Figure 5 shows the operating range of the switching valve 6 in a table according to the conditions of high and low temperatures between the hot water temperature θ ₁ in the hot water supply pipe ₂ , the hot water temperature θ 2 in the auxiliary tank 4, and the set temperature θ _s . It is something. Since there are three temperatures to be compared, all conditions apply to any one of the six cases A to F in FIG. 5. In addition, Fig. 6 shows the temperature changes of θ ₁ and θ ₂ together with θ _s when the faucet 8 is opened and the device is started to be used while the auxiliary tank 4 is filled with water. FIG. 7 shows the temperature changes when the faucet 8 is opened and use is started when the water in the auxiliary tank 4 is sufficiently hot. The states A to F in FIGS. 6 and 7 correspond to the states A to F in FIG. 5.

Next, the operation of the switching valve 6 in each of the states A to F in FIGS. 5 to 7 will be described.

(b) When θ ₁ < θ ₂ < θ _s At this time, the inside of the auxiliary tank θ ₁ is lukewarm water or water at the beginning of use, and since θ < θ _s , the motor 9 reverses, but θ Since ₁ < θ ₂ , the signal generator 43 outputs a signal of x=1. Therefore, the switching valve 6 stops at position [2], and the auxiliary tank 4
Only the water inside comes out from faucet 8.

Therefore, compared to the state [1], that is, the state in which the water in the hot water supply pipe 2 comes out, slightly warmer water comes out. Note that water in the hot water supply pipe 2 flows into the auxiliary tank 4.

(b) When θ ₂ <θ ₁ <θ _s If the condition (a) continues, the hot water from the hot water supply source 1 reaches near the branch portion 3b of the hot water supply pipe 2, and θ ₂ <θ ₁ <θ _s . At this time, since θ<θ _s, the motor 9 rotates in reverse, and since θ ₂ <θ ₁ , the signal generator 43 outputs a signal of x=0. Therefore, the switching valve 6 stops at the position [1], and in this state, only the water in the hot water supply pipe 2 comes out from the faucet 8. Therefore, once the water stored in the hot water supply pipe 2 is discharged, hot water will begin to flow from the faucet 8.

(c) When θ ₂ < θ _s < θ ₁ When the hot water temperature θ ₁ in the hot water supply pipe rises and becomes θ _s < θ ₁ ,
The hot water in the hot water supply pipe 2 and the water in the auxiliary tank 4 are mixed, and hot water at the set temperature θ _s comes out from the faucet 8.

That is, since θ ₂ <θ ₁ , the signal generator 43 outputs x=
A signal of 0 is output and the switching valve 6 switches between [1] and [3].
When the hot water in the discharge pipe 7 exceeds the set temperature and θ _s < θ, the switching valve 6 switches [1] →
When the switching valve 6 rotates in the [3] direction and θ _s >θ, the switching valve 6 rotates in the [1]←[3] direction. However, since the water temperature θ ₂ in the auxiliary tank 4 is lower than the set temperature θ _s , the water in the auxiliary tank 4 and the water in the water supply pipe 5 will not mix in the conditions [2] to [3]. . Therefore, the switching valve 6 reciprocates between [1] and [2]. In this way, the hot water in the hot water supply pipe 2 and the water in the auxiliary tank 4 are mixed, and the hot water temperature in the discharge pipe 7 is θ.
is maintained the same as the set temperature θ _s . During this time, the hot water in the hot water supply pipe 2 flows into the auxiliary tank 4, and the temperature θ ₂ in the auxiliary tank 4 also rises rapidly.

(d) When θ _s < θ ₂ < θ ₁ The water temperature θ ₂ in the auxiliary tank 4 rises and the set temperature θ _s
When the temperature exceeds the temperature, the hot water in the auxiliary hot water supply pipe 3 and the water in the water supply pipe 5 are mixed, and hot water at the set temperature θ _s comes out from the faucet 8.

That is, since θ ₂ <θ ₁ , the signal x=0 and the switching valve 6
can be located between [1] and [3], and θ _s
The switching valve 6 rotates in accordance with the change in height between and θ. However, here, the hot water temperature θ ₁ in the hot water supply pipe 2 and the hot water temperature θ ₂ in the auxiliary tank 4 are both higher than the set temperature θ _s , so the two hot water are mixed [1]
The state [2] will never occur. Therefore, the switching valve 6 moves between [2] and [3].

In this way, the hot water in the auxiliary tank 4 flowing from the hot water supply pipe 2 and the water in the water supply pipe 5 are mixed, and the hot water temperature θ in the discharge pipe 7 is maintained at the same value as the set temperature θ _s .

It is more convenient if the signal generator 43 outputs a signal of x=1 under this condition, that is, when θ _s <θ ₂ . That is, when the signal x=1 is output, the switching valve 6 can only be positioned between [2] and [3], so the faucet 8
Even when the water temperature θ in the discharge pipe 7 decreases due to closing of the switch valve 6, the switching valve 6 does not move to the position [1] but stops at the position [2]. Therefore, when the faucet 8 is opened next time, the switching valve 6 immediately moves between [2] and [3], and hot water at the set temperature θ _s is dispensed.

(e) When θ _s < θ ₁ < θ ₂ This state is a stable state when the faucet 8 is kept open, and the hot water in the hot water supply pipe 2 flows into the auxiliary tank 4, but the hot water does not flow into the auxiliary tank 4. The temperature of the water rises due to the action of the provided electric heater, and θ ₁ <θ ₂ .

In this state, the switching valve 6 is
moves between [2] and [3], and the auxiliary hot water pipe 3
The hot water inside is mixed with the water in the water supply pipe 5, and hot water at the set temperature _θs comes out from the faucet 8.

Also, since θ ₁ <θ ₂ , the signal x=1, the switching valve 6 can only be positioned between [2] and [3], and the faucet 8 is closed and the water temperature in the discharge pipe 7 is θ. Even when the switching valve 6 is lowered, the switching valve 6 does not move to the position [1] but stops at the position [2]. Therefore, when the faucet 8 is opened next time, the switching valve 6 immediately switches to [2]~
[3] The hot water at the set temperature θ _s is dispensed.

(f) When θ ₁ < θ _s < θ ₂ This is the state when the faucet 8 is opened from the most normal stopped state in which the electric heater of the auxiliary tank 4 is turned on and the faucet 8 is closed. It is.

In this state, since θ ₁ <θ ₂ , the signal x=1,
The switching valve 6 can only be located between [2] and [3], and since this state is at the start of dispensing, θ<θ _s , and the switching valve 6 is in the full position [2] in the reverse direction. ] is stopped. Therefore, when the faucet 8 is opened, the water in the hot water supply pipe 2 first flows into the auxiliary tank 4, mixes with the water in the auxiliary tank 4, and is sent out from the auxiliary hot water supply pipe 3 to the discharge pipe 7. Then, the switching valve 6 moves between positions [2] and [3] according to the difference between the hot water temperature θ in the discharge pipe 7 and the set temperature θ _s , and hot water at the set temperature θ _s is dispensed. .

In this case, if the switching valve 6 moves to the [1] position while the faucet 8 is closed, only the water in the hot water supply pipe 2 will come out when hot water starts to flow out, and the auxiliary tank 4 will not be present. However, in this embodiment, the signal generator 43 outputs x
A signal of =1 is issued, and the switching valve 6 switches between [2] and [3].
Such inconvenience does not occur because it can only be located between the two.

[Effects of the invention] According to the water heater of the invention, the outlet of the auxiliary hot water pipe in which the auxiliary tank for heating and storing hot water is inserted is connected to the discharge pipe either alone or simultaneously with the hot water pipe and the water supply pipe. This means that when hot water is stored in the auxiliary tank, not only can hot water at an appropriate temperature be quickly dispensed, but also only the hot water supply pipe can be connected to the discharge pipe. When water is stored in the auxiliary tank, the hot water sent from the hot water supply source into the hot water supply pipe does not flow into the auxiliary tank but directly exits.
You can get hot water in a short time. Moreover,
Since all switching can be performed by providing only one switching valve in the device, the structure is simple and can be implemented at low cost.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of an embodiment of the present invention;
Figure A is a sectional view of the vicinity of the switching valve, Figure 2B is a sectional view taken along the line B-B, Figure 3 is a sectional view showing the changed state of the switching valve, Figure 4 is a circuit diagram of the control circuit, and Figure 4 is a circuit diagram of the control circuit. FIG. 5 is a table showing the operating range of the switching valve according to temperature conditions, and FIGS. 6 and 7 are graphs showing changes in the hot water temperature θ ₁ in the hot water supply pipe and the hot water temperature θ ₂ in the auxiliary tank. 1...Hot water supply source, 1a...Hot water outlet, 2...Hot water supply pipe, 2a...Hot water supply pipe outlet, 3...Auxiliary hot water supply pipe, 3
a... Auxiliary hot water pipe outlet, 3b... Branch, 4...
Auxiliary tank, 5... Water supply pipe, 5a... Water supply pipe outlet, 6... Switching valve, 6a... Hole, 7... Discharge pipe,
8...Faucet, 9...Valve driving means (motor), 10
... Control circuit, 11, 12, 13 ... Temperature sensor, 14 ... Hot water temperature setting device, 36 ... Temperature comparison circuit, 37 ... Forward/reverse IC, 43 ... Signal generator.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A hot water supply pipe connected to a hot water outlet of a hot water supply source, an auxiliary hot water pipe that is branched from the hot water supply pipe and has an auxiliary tank for heating and storing hot water inserted in the middle, and a water supply pipe connected to a water source and the outlet of one of these three pipes, or simultaneously the outlet of the hot water supply pipe and the outlet of the auxiliary hot water pipe,
Alternatively, a switching valve that selectively connects the outlet of the auxiliary hot water pipe and the outlet of the water supply pipe to a common discharge pipe at the same time, and the hot water temperature θ ₁ in the hot water pipe near the branch part and the hot water in the auxiliary tank. A temperature sensor that detects the hot water temperature θ ₂ and a hot water temperature θ in the discharge pipe, a hot water temperature setting device that sets the hot water temperature in the discharge pipe to a desired set temperature θ _s , and a A water heater comprising a valve control means for controlling the operation of the switching valve according to an output signal. 2. The hot water supply according to claim 1, wherein the valve control means compares the hot water temperature θ in the discharge pipe with the set temperature θ _s and controls the operation of the switching valve according to the comparison result. Device. 3. The utility model registration claim No. 3, wherein the valve control means compares the hot water temperature θ ₁ in the hot water supply pipe with the hot water temperature θ ₂ in the auxiliary tank and controls the operation of the switching valve according to the comparison result. The hot water supply device according to either item 1 or 2. 4 When the hot water temperature θ ₁ in the hot water supply pipe is lower than the hot water temperature θ ₂ in the auxiliary tank (θ ₁ <θ ₂ ), the valve control means controls the switching valve so that the hot water supply pipe does not communicate with the discharge pipe. A water heater according to claim 3, which controls the operation of the water heater. 5 When the set temperature θ _s is lower than the hot water temperature θ ₂ in the auxiliary tank (θ _s < θ ₂ ), the valve control means controls the operation of the switching valve so that the hot water supply pipe does not communicate with the discharge pipe. Scope of Claim for Utility Model Registration No. 4
Water heater as described in section.