JPH03117849A - Hot water feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention branches a hot water supply path from a heat exchanger for water heating into a first hot water supply path and a second hot water supply path that can be opened and closed, respectively, and The bypass passage branched from the water supply passage to the heat exchanger is connected to the first
A check valve connected to the hot water supply path, downstream of the branch point between the first hot water supply path and the second hot water supply path, and upstream of the connection point of the bypass path, in the first hot water supply path. The present invention relates to a hot water supply device in which a flow rate detection means is provided in the water supply channel.

[Conventional technology]

Conventionally, in the above-mentioned water heater, a flow rate detection means provided in the water supply channel is placed downstream of a branch point between the water supply channel and the bypass passage, and various hot water supply controls are performed based on the flow rate detected by the flow rate detection means. I have configured it to do this, but
As a configuration for determining that the first hot water supply path is opened while hot water is being supplied to the second hot water supply path side, a water flow detection means that is activated when water flow starts in the bypass path is provided in the bypass path. By detecting the start of water flow in the bypass path, which occurs when the first hot water supply path is opened during hot water supply to the second hot water supply path side, by operating the water flow detection means, the first hot water supply path during hot water supply to the second hot water supply path side can be detected. It was designed to determine whether the hot water supply path was open.

[Problem to be solved by the invention]

However, in the conventional device as described above, the device configuration is such that a water flow detection means is attached to the bypass path as a dedicated means for determining whether or not the first hot water supply path is open during hot water supply to the second hot water path. This has led to a decrease in manufacturing efficiency, as well as an increase in the size and cost of the device.

An object of the present invention is to make it possible to obtain functions equivalent to conventional devices while simplifying the device configuration through rational improvements.

[Means to solve the problem]

The characteristic configuration of the hot water supply apparatus according to the present invention is that the hot water supply path from the water heating heat exchanger is branched into a first hot water supply path and a second hot water supply path, which can be opened and closed, respectively, and the water supply path to the water heating heat exchanger is A bypass path branched from the water supply path is connected to the first hot water supply path;
On the downstream side of the branch point between the hot water supply path and the second hot water supply path,
and a configuration in which a check valve is interposed in the first hot water supply channel and a flow rate detection means is provided in the water supply channel on the upstream side of a connection point of the bypass channel, wherein the branching of the bypass channel in the water supply channel is provided. The flow rate detection means is disposed upstream of the point, and when the flow rate detected by the flow rate detection means deviates from a set threshold change state and changes to an increasing side during hot water supply to the second hot water supply path side, the first The purpose is to provide a determining means for determining that the hot water supply path has been opened, and its functions and effects are as follows.

[For production]

In other words, in the above configuration, the detected flow rate of the flow rate detection means provided in the water supply channel upstream of the branch point between the water supply channel and the bypass channel is determined when the first hot water supply channel is opened while hot water is being supplied to the second hot water supply channel. , In order to start water flow in the bypass path, that is, to start water flow from the water supply path to the bypass path, a preset amount change state is changed from the steady state of hot water supply to the second hot water path side. deviate and specifically increase and change.

Then, by detecting an increase in the detected flow rate that deviates from the set threshold change state, the determination means determines whether the first water supply path is open during hot water supply to the second hot water supply path.

〔Effect of the invention〕

That is, according to the present invention, the flow rate detection means provided in the water supply channel is used to detect hot water being supplied to the second hot water supply channel side, without having to attach a water flow detection means dedicated to open circuit determination to the bypass channel as in conventional devices. It is possible to determine whether or not the first hot water supply path is open, and the flow rate detected by the flow rate detection means can be used for various hot water supply controls as before. As a result, while obtaining the same functions as the conventional device, By omitting the equipment attached to the water flow detection means, the configuration of the device can be greatly simplified, and as a result, manufacturing efficiency can be improved, and the device can be downsized and cost reduced.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the overall configuration of a water heater, in which (1) is a water heating heat exchanger, and (2) is a burner.

A hot water supply path (3) from the heat exchanger (1) is a first hot water supply path (3a) for general hot water supply connected to a hot water tap (4), and a bathtub (5).
) and a second hot water supply path (3b) for bath hot water supply, which is connected to bypass road (7)
Connect it.

(8) is a water supply temperature sensor, (9) is a water flow sensor that detects the water supply amount, (10) is a hot water supply sensor that detects the hot water supply from the heat exchanger (1), and (11) is a check valve. .

(12) is a three-way valve installed at the branch point between the water supply channel (6) and the bypass channel (7), which opens the valve to the heat exchanger (1) depending on the rotation angle of the drive motor (12a). It has a function of adjusting the opening degree (a) and the opening degree (b) of the valve toward the bypass path (7) in a pattern as shown in FIG. In addition, the water flow sensor (9) has a three-way valve (12) as its boundary.
It is provided on the upstream side of the water supply channel (6).

(13) is a spark plug for igniting burner (2), (14) is a gas valve that opens and closes a fuel supply pipe that supplies gas fuel to burner (2), and (15) is a spark plug for igniting burner (2). (16) is a bath valve that opens and closes the second hot water supply path (3b);
17) is a vacuum breaker that prevents backflow of bath water.

(19) is based on the manual operation directive as shown in (a) to (d) below.
This is a controller that executes operational control.

(b) When the general hot water tap (4) is opened, the water flow sensor (
9) in response to detecting the amount of water, the gas valve (14) is opened and the burner (2) is ignited by the ignition action of the spark plug (13).

Then, the three-way valve (12) is moved to the fourth operating range (Z
), and in order to make the hot water temperature from the heat exchanger (1) equal to the set general hot water temperature (Ta), the set general hot water temperature (Ta) and the water supply detected by the water supply temperature sensor (8) are adjusted. The fuel adjustment valve (15) is adjusted based on the water temperature ('r+) and the water supply amount (Ql) detected by the water flow sensor (9), and the hot water temperature (T2) detected by the hot water temperature sensor (10).
The adjustment of the fuel adjustment valve (15) is corrected according to the deviation between the temperature and the set general hot water temperature (Ta).

In addition, the necessary heating capacity to obtain the set general hot water temperature (Ta) should not exceed the upper limit heating capacity (i.e.,
In adjusting the fuel adjustment valve (15) described above, the three-way valve (12
) within the fifth operating range (Z゛).

Note that the bath valve (16) is in a flow path blocked state.

(0) Hot water filling When a hot water filling operation command is given, the bath valve (16) is opened, and the burner (2) is ignited in response to the accompanying water amount detection by the water amount sensor (9). Then, with the three-way valve (12) adjusted within the second operating range (X'), the heat exchanger (1)
In order to set the hot water supply temperature from the hot water supply unit to the set hot water supply temperature (Tb), the set hot water supply unit (Tb) and the water supply temperature sensor (8)
Based on the water supply temperature (T1) detected by the sensor and the water supply amount (Ql) detected by the water flow sensor (9)
At the same time, correction is made to the adjustment of the fuel adjustment valve (15) according to the deviation between the hot water temperature (T2) detected by the hot water temperature sensor (10) and the set hot water filling part (Tb).

In addition, the three-way valve (12) is adjusted within the first operating range (X) as necessary so that the heating capacity required to obtain the set hot water supply part (Tb) does not exceed the upper limit heating capacity. .

(c) Reheating Hot water supply When a reheating operation command is given, the bath valve (16) is opened in the same way as for hot water supply, and the burner (2) is ignited in response to the accompanying water flow detection by the water flow sensor (9). let Bathtub (5)
The three-way valve (12) is connected to the first
Adjusted within the operating range (X), the hot water temperature from the heat exchanger (1) was set to a high temperature compared to the set general hot water temperature (Ta) and the set hot water supply section (Tb). Reheating hot water temperature (Tc)
(for example, a high temperature of 93°C), the set reheating hot water temperature (Tc), the detected water supply temperature (T1) by the water supply temperature sensor (8), and the water supply amount (Ql) detected by the water flow sensor (9). The fuel adjustment valve (15) is adjusted based on the difference between the hot water temperature (T2) detected by the hot water temperature sensor (10) and the set reheating hot water temperature (Tc).
Add correction to the adjustment in 15).

(d) Interruption of general hot water supply during hot water filling or reheating vortex The three-way valve (12) is in the first or second operating range (X), (X”
) and the bypass passage (7) is open when the hot water tap (4) is opened during hot water supply or reheating hot water supply, the bypass passage (7) is opened and the heat exchanger (1) is bypassed. With the start of water flow in the channel (7), the water supply amount (Ql) detected by the water amount sensor (9) increases rapidly, but in contrast, the determination circuit (19a) installed in the controller (19) 9), when the detected water supply amount (Ql) increases from the steady state during hot water filling or reheating vortex supply by more than the set amount (ΔQ) at a gradient of more than the set gradient (α) as shown in Fig. 3, the bypass passage It is determined that the water flow has started in step (7), and based on this water flow start determination, it is determined whether the hot water tap (4) is opened.

In other words, while hot water is being supplied to the second hot water supply path (3b) side, the hot water tap (4
) is opened and the first hot water supply path (3a) is opened by detecting the start of water flow in the bypass path (7).
It consists of a).

When it is determined that the hot water tap (4) is open, the controller (19) sets the target hot water temperature from the heat exchanger (1) to the hot water filling temperature (
Tb) or set reheating hot water temperature (Tc) to set general hot water temperature (Ta), close the bath valve (16) and switch the three-way valve (12) to the first or second operating range (X). ,
(X') to the fourth or fifth operating area (Z), (Z'
), thereby switching the hot water supply state to the general hot water supply state which is performed with the bypass path cut off.

[Another example]

Next, another example will be listed.

(a) The hot water tap in the above embodiments may be of any type, such as a tap, a mixer tap, a shower tap, an automatic valve, etc.

(b) In the above embodiment, a three-way valve (12) is provided at the branch point of the water supply channel (6) and the bypass channel (7), and the operation of the three-way valve (12) causes the heat exchanger (1) to The amount of water supplied was adjusted and the bypass passage (7) was opened and closed. Flow rate adjustment valve (2
1) may provide the same function as the three-way valve (12).

(C) In the above-described embodiment, the flow rate detected by the flow rate detection means (the water supply amount detected by the water flow sensor (9) (Q,)
) increases by a set amount (ΔQ) at a set gradient (α) from the steady state during hot water supply to the second hot water supply path (3b) side, and the detected flow rate (Ql) is set. An increase of more than the set amount (ΔQ) with a gradient of (α) or higher is considered to be an increase change that deviates from the set threshold change state, but what kind of change state should be set as the threshold change state? can be changed in various ways depending on the device characteristics of the water heater. For example, by setting the threshold change state to be an increase in the detected flow rate (Ql) by a set amount (ΔQ) per unit time, Detected flow rate (Ql) per hour
) may be regarded as an increase change exceeding a set amount (ΔQ) as an increase change that deviates from the set threshold change state, and a continued increase change in the detected flow rate (Ql) over a set time may be regarded as a threshold change state. Detected flow rate (Q
The fact that l) continues to increase over a set time period may be regarded as an increase that deviates from the set threshold change state.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 3 show examples of the present invention, FIG. 1 is a diagram of the device configuration, FIG. 2 is a graph showing the adjustment pattern of the three-way valve, and FIG. 3 is a graph for explaining the open circuit determination mode. It is. FIG. 4 is an apparatus configuration diagram showing another embodiment of the present invention. (1)...Heat exchanger, (3)...Hot water supply path, (3a)...First hot water supply path, (3b)...
...Second hot water supply channel, (6)...... Water supply channel, (7)
... Bypass path, (9) ... Flow rate detection means, (11) ... Check valve, (19a) ...
...judgment means.

Claims (1)

[Claims] The hot water supply path (3) from the water heating heat exchanger (1) is branched into a first hot water supply path (3a) and a second hot water supply path (3b), which can be opened and closed, respectively, and the water heating heat exchanger ( 1) Water supply channel to (6)
The bypass path (7) branched from the first hot water supply path (3a
), on the downstream side of the branch point between the first hot water supply path (3a) and the second hot water supply path (3b), and on the upstream side of the connection point of the bypass path (7), A hot water supply device in which a check valve (11) is interposed in a first hot water supply path (3a) and a flow rate detection means (9) is provided in the water supply path (6), wherein the bypass is provided in the water supply path (6). The flow rate detection means (9) is arranged upstream of the branch point of the path (7), and the flow rate detected by the flow rate detection means (9) is set during hot water supply to the second hot water supply path (3b) side. When the state deviates from the threshold change state and changes to the increasing side, the first hot water supply path (3a
) is opened.