JPH086190Y2 - Water heater with high-temperature hot water function - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a water heater having a high-temperature hot-water supply function, and more particularly to a quick and quick operation for shifting from a high-temperature hot-water supply state to a normal hot-water supply state. The present invention relates to a hot water heater with a high-temperature hot water function, which is stably performed and is supplied with hot water of an appropriate temperature to a hot water supply pipe during a transition process.

[Conventional technology]

FIG. 5 is a system diagram showing a conventional example of a water heater with a high-temperature hot water function.

Reference numeral 1 is a water supply pipe for supplying water, and 2 is a hot water supply pipe connected to a hot water tap, a shower or the like (not shown).

For convenience of description, a point a that hits the downstream end of the water supply pipe 1 is called a branch point, and a point b that hits the upstream end of the hot water supply pipe 2 is called a junction.

A heating circuit c in which the heat exchanger 3 and the three-way valve 4 are connected in series is provided between the branch point a and the merge point b, and the branch point a and the merge point are provided in parallel with the heating circuit c. b
Bypass circuit d having a first solenoid valve (I) 5 between
Is provided. For convenience of explanation, this is referred to as a first bypass circuit d.

T ₁ is a sensor for detecting the water supply temperature, T ₂ is a sensor for detecting the hot water temperature, F ₁ is a flow sensor for detecting the flow rate of the heating circuit c, and F ₂ is a flow for detecting the flow rate in the hot water supply pipe 2. It is a sensor.

Reference numeral 8 is a bathtub pipe for supplying hot hot water to a bathtub (not shown), which is branched from the three-way valve 4 and provided with a second solenoid valve (II) 6 and a check valve 7. There is.

 M is a gear motor that drives the three-way valve 4.

The output signal of each of the above-mentioned sensors is input to an automatic control device composed of a microcomputer (not shown), and the automatic control device has a first solenoid valve (I) 5 and a second solenoid valve (II).
6 and the three-way valve 4 are opened and closed as follows.

FIG. 6 shows the state of high temperature boiling water. The three-way valve 4 connects the bathtub pipe 8 and the heat exchanger 3, and the second solenoid valve (II) 6 is opened.

The water supply is heated by the heat exchanger 3 to form hot water, which is sent to the bathtub pipe 8 through the three-way valve 4 and the second solenoid valve (II) 6, and the hot water (for example, 80 ° C) is put into the bathtub. Supplied. Pipes drawn in thin lines represent water-passing pipes.

FIG. 7 shows a hot water supply state, in which the hot water supply state (FIG. 6) is changed to a hot water supply state and stabilized.

The water supply is sent to the hot water supply pipe 2 through the heat exchanger 3 and the three-way valve 4. The flow rate in the hot water supply pipe 2 is detected by the flow sensors F ₁ and F ₂ and input to an automatic control device (not shown). The automatic control device controls the combustion state of a burner (not shown) so that the hot water temperature sensor T ₂ detects The signal is controlled to reach the set temperature (for example, 40 ° C).

When the shower plug (not shown) connected to the end of the hot water supply pipe 2 is opened in the high-temperature hot water condition of FIG. 6, the flow sensor F ₂ provided in the hot water supply pipe 2 detects this. Detect.

The automatic control device (not shown) which receives the output signal of the flow sensor F ₂ operates each valve so as to be in the transient state as shown in FIG. That is, it is heated in the heat exchanger 3,
The high-temperature hot water that has passed through the three-way valve 4 and the low-temperature water that bypassed the first electromagnetic valve (I) 5 are mixed at the confluence point b and sent to the hot water supply pipe 2.

[Problems to be solved by the device]

In the water heater having the high-temperature hot water function of the conventional example described above, in a transitional state during the transition from the high-temperature hot water state to the hot water supply state, the hot water and the cold water are mixed and sent to the hot water supply pipe, Quick switching from hot water supply to hot water supply
It was difficult to make a smooth transition.

 The reason is as follows.

Since the heat exchanger 3 has a considerable heat capacity, even if the combustion state of the burner is suppressed, the hot water outlet temperature does not immediately drop.

Therefore, the cold water that has flowed through the first solenoid valve (I) 5 of the first bypass circuit d between the time when the flow sensor F ₂ detects water flow and the time when the three-way valve 4 is switched to the hot water supply pipe 2 side. Is delivered to the hot water supply pipe 2.

For this reason, there is an unstable period, for example, about 60 seconds, between the high-temperature hot water state shown in FIG. 6 and the hot water state shown in FIG. 7 becoming stable. Too much cold water may come out to the user and cause discomfort.

The present invention has been made in view of the above circumstances, and it is possible to quickly transition from a high-temperature hot water state to a hot water supply state, and yet to supply hot water of an appropriate temperature to a hot water supply pipe even during a transitional period of the transition. In particular, it is an object of the present invention to provide a water heater with a high-temperature hot water function, in which there is no fear that cold water will be discharged from the hot water supply pipe during the transitional period and the user will feel uncomfortable.

[Means for solving the problem]

A configuration for achieving the above object will be described below with reference to FIG. 1 corresponding to one embodiment of the present invention.

Bypass the three-way valve 4 and the second solenoid valve (II) 6,
A second bypass circuit e (shown by a thick line) that connects the outlet side of the heat exchanger 3 and the bathtub pipe 8 is provided, and a third solenoid valve (III) 9 is provided in the middle of the second bypass circuit e. And a third bypass circuit f (indicated by a thick line) that bypasses the three-way valve 4 and connects the outlet side of the heat exchanger 3 and the hot water supply pipe 2 with each other. The fourth solenoid valve (IV) 10 and the check valve 11 are connected in the middle of f.

Then, the third solenoid valve (III) is closed by an automatic control device (not shown) in the hot water state, opened in the transient state, and closed in the hot water state.

The fourth solenoid valve (IV) is closed in the hot water state and opened in the transient state.

[Action]

According to the above configuration, when the transition from the high-temperature boiling water state to the transient state, the third solenoid valve (III) is opened, so that the second solenoid valve (III) is opened.
A large amount of water that passes through the bypass circuit e of 1 flows into the heat exchanger 3. Therefore, the temperature of the heat exchanger 3 is rapidly lowered, and the transition to the hot water supply state is promoted.

Moreover, since the fourth solenoid valve (IV) is opened, the three-way valve 4
Is switched to the hot water supply side, so do not wait for the heat exchanger 3
The hot water heated in 1 flows through the third bypass circuit f to the confluence b. At this junction b, the first solenoid valve (I)
The low-temperature water bypassing is mixed with the hot water described above, becomes hot water of an appropriate temperature, and is supplied to the hot water supply pipe 2.

In this way, it is possible to quickly and smoothly transition from the high-temperature hot water state to the hot water supply state, and moreover, hot water of an appropriate temperature is supplied to the hot water supply pipe during the transitional period of this transition.

〔Example〕

FIG. 1 is a system diagram showing one embodiment of a water heater having a high-temperature hot water function according to the present invention.

This embodiment is an example improved by applying the present invention to the water heater of the conventional example shown in FIG. 5, and members having the same reference numerals as those in FIG. Through are similar components.

Next, differences from the conventional example will be described.

A second bypass circuit e having a third solenoid valve (III) 9 which is controlled by an automatic control device (not shown), is closed in a hot water state, is opened in a transient state, and is closed in a hot water state is A fourth solenoid valve which is connected between the outlet side of the exchanger 3 and the bathtub pipe 8 and is controlled by the above-mentioned automatic control device (not shown) to be closed in the hot water state and opened in the transient state ( A third bypass circuit f having IV) 10 is connected between the outlet side of the heat exchanger 3 and the hot water supply pipe 2.

Reference numeral 11 is a check valve provided in the third bypass circuit f.

When an operator gives a high-temperature hot water command to an automatic control device (not shown), the third solenoid valve (III) 9
Closed, the second solenoid valve (II) 6 opened, and the three-way valve 4
Is switched to the bathtub pipe 8 side, and the fourth solenoid valve (IV) 10
Is closed and the state shown in FIG. 2 is reached. In this high temperature boiling water state, the first solenoid valve (I) 5 is open.

The water supply supplied from the water supply pipe 1 flows as shown by the thick line in FIG. 2, is heated by the heat exchanger 3, and is fed by the three-way valve 4,
After passing through the second solenoid valve (II) 6 and the check valve 7 in sequence, the hot water is delivered to the bathtub pipe 8.

At this time, the flowing water temperature is monitored by the temperature sensors T ₁ and T ₂ , and the flowing water flow rate is monitored by the flow sensor F ₁ , and the detection value of the temperature sensor T ₂ on the tap water side is set to a high temperature hot water setting temperature (for example, 80 C), the combustion state of the burner (both not shown) is controlled by the automatic control device.

In the hot water state shown in FIG. 2, the hot water supply pipe 2
When a hot water supply tap (not shown) is opened at the end of the hot water supply pipe and water is passed through the hot water supply pipe 2, the transition to the hot water supply condition shown in FIG. 4 is made through the transitional condition shown in FIG.

FIG. 3 shows a state immediately after water is passed through the hot water supply pipe 2.

The flow rate of water flowing through the hot water supply pipe 2 is detected by the flow sensor F ₂ and input to an automatic control device (not shown), which automatically controls the third solenoid valve (III) 9 and the fourth solenoid valve ( IV) Open 10 and.

When the third solenoid valve (III) 9 is opened, a large amount of water is supplied to the heat exchanger 3 to remove heat, and the heat is delivered to the bathtub pipe 8. As a result, the outlet temperature of the heat exchanger 3 rapidly drops, so that the hot water supply state can be quickly and safely achieved.

On the other hand, during this transient state, the fourth solenoid valve (IV) 1
The relatively high temperature hot water that has flowed through the check valve 11 is mixed with the cold water that has flowed through the first electromagnetic valve (I) 5, and is supplied to the hot water supply pipe 2 as hot water having an appropriate temperature. Since this operation is performed without waiting for the three-way valve 4 to be switched to the hot water supply side, the problem that cold water is discharged from the end of the hot water supply pipe 2 for a long time (for example, several tens of seconds) does not occur.

As described above, the outlet temperature of the heat exchanger 3 sharply drops due to a large amount of water flow, and the temperature is detected by the temperature sensor T ₂ . When the detected temperature approaches the hot water supply set temperature (for example, 40 ° C.), the three-way valve 4 is switched to the hot water supply side as shown in FIG. 4, the third solenoid valve (III) 9 is closed, and after a few seconds, the first hot water The solenoid valve (I) 5 is closed. As a result, the entire amount of water supply becomes hot water through the heat exchanger 3 and is sent to the hot water supply pipe 2 via the three-way valve 4 to shift to the hot water supply state. In this state, the temperature of water flow is detected by the temperature sensors T ₁ and T ₂ ,
The flow rate of the flowing water is detected by the flow sensors F ₁ and F ₂ , and the automatic control device controls the combustion state of the burner (neither is shown) based on the detection signals, and the output signal of the hot water temperature sensor T ₂ is output. The hot water supply state is maintained while automatically adjusting to the hot water supply set temperature.

[Effect of device]

As described above, according to the water heater having the hot-water supply function according to the present invention, the transition from the hot-water supply state to the hot-water supply state can be performed quickly and smoothly, and during the transitional period of the transition. Even in the case, the hot water of appropriate temperature is stably supplied. In particular, there is no possibility that cold water will be discharged from the hot water supply pipe during the transitional period and the user will feel uncomfortable.

[Brief description of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is a water system diagram for explaining the difference from the conventional example, and FIG. 2 is a water system depicting the hot water state. Fig. 3 is a water system diagram depicting a transient state, and Fig. 4 is a water system diagram depicting a hot water supply state. 5 to 8 show a conventional water heater, FIG. 5 is a water system diagram showing basic piping, FIG. 6 is a water system diagram showing a high-temperature hot water state, and FIG. 7 is hot water supply. FIG. 8 is a water system diagram depicting a state, and FIG. 8 is a water system diagram depicting a transient state. 1 ... Water supply pipe, 2 ... Hot water supply pipe, 3 ... Heat exchanger, 4 ... Three-way valve,
5 ... 1st solenoid valve (I), 6 ... 2nd solenoid valve (II), 7
... Check valve, 8 ... Bathtub piping, 9 ... Third solenoid valve (III), 1
0 ... Fourth solenoid valve (IV), 11 ... Check valve.

Claims (1)

[Scope of utility model registration request] 1. A heating circuit (c) having a three-way valve (4) connected in series to a heat exchanger (3) is provided between a water supply pipe (1) and a hot water supply pipe (2), A first bypass circuit (d) having a first solenoid valve (5) is provided in parallel with the heating circuit, and a bathtub pipe (8) for guiding hot water passing through the heat exchanger to a bathtub, Second solenoid valve (6)
Is connected to the three-way valve via a solenoid valve, the first and second solenoid valves and the three-way valve are operated by an automatic control device, and the hot water heated by the heat exchanger is delivered to the bathtub pipe. In the process of transitioning from the hot water supply state to the hot water supply state in which the hot water heated in the heat exchanger is sent to the hot water supply pipe,
In the water heater which can be switched to three states of a transient state in which the hot water heated by the heat exchanger and the water flowing through the first bypass circuit are mixed and sent to the hot water supply pipe, the three-way valve ( 4) and the second solenoid valve (6) in parallel, connected between the heat exchanger (3) and the bathtub pipe (8), closed in the hot water state and opened in the transient state. And a second bypass circuit (e) having a third solenoid valve (9) closed in the hot water supply state, and in parallel with the three-way valve, the heat exchanger and the hot water supply pipe (2). And a third bypass circuit (f) having a fourth solenoid valve (10) and a check valve (11) which are connected to each other and are closed in a hot water state and opened in a transient state. A water heater having a high-temperature hot water function, which is characterized in that