JP2501986B2 - Hot water supply control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing valve for mixing hot water from a hot water supply passage and hot water from the water supply passage and discharging the hot water to the hot water discharge passage.
A target temperature setting means for setting a target hot water temperature in the hot water discharge passage is provided, and the temperature-sensitive expansion / contraction body for the mixing valve and an adjusting means for adjusting the position of the expansion / contraction body change the mixing ratio of hot and cold water. Accordingly, the present invention relates to a hot water supply control device provided with control means for providing a control command to the adjusting means according to the target hot water temperature.

[0002]

2. Description of the Related Art In the hot water supply control device as described above, the expandable body expands and contracts according to the hot water temperature in the hot water passage to change the mixing ratio of hot and cold water so that the hot water discharge temperature matches the target hot water discharge temperature. By the way, when the mixing valve is out of order, the hot water outlet temperature in the hot water outlet and the target hot water outlet temperature may be significantly deviated from each other. Therefore, in such a case, it is desirable to notify the user by displaying that a failure has occurred. Conventionally, for example, there has been one that lights an alarm lamp when a failure occurs.

[0003]

In the above-mentioned prior art, it is not possible to determine which part of the mixing valve has a failure. As a result, it may take time to recover from the failure. An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a user with a material for discriminating a failure location of a mixing valve to obtain a hot water supply control apparatus capable of promoting recovery from the failure.

[0004]

To achieve this object, the hot water supply control apparatus according to the present invention is characterized in that the control means has a difference between a hot water discharge temperature in the hot water discharge passage and the target hot water discharge temperature having a predetermined value. When it exceeds, it is configured to give a control command to the adjusting means to close either one of the hot water supply passage and the water supply passage, and a determination means for determining whether or not the water temperature at the other time and the hot water outlet temperature match. And a display means for displaying the determination result.

[0005]

When the difference between the outlet heated water temperature and the target outlet heated water temperature exceeds a predetermined value, it is determined that the mixing valve has failed. For example, when a control command for closing the water supply passage is given, it is determined whether or not the hot water temperature and the hot water discharge temperature of the hot water supply passage match, and the determination result is displayed. Here, if they do not match, it is considered that the water supply channel is not closed even though the instruction to close the water supply channel is given, so it can be determined that the adjusting means is not operating normally. On the other hand, if they coincide with each other, it is considered that the water supply passage could be closed without fail, and it can be determined that the adjusting means is operating normally. Nevertheless, if the hot water temperature is not adjusted properly, it can be judged that an abnormality has occurred in the function of the stretchable body.

[0006]

According to the present invention, when a failure occurs in the mixing valve, the user can be provided with a material for discriminating the failure location of the mixing valve. Therefore, recovery from the failure of the hot water supply control device can be promoted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, with respect to the hot water supply unit A that heats the water supplied from the water inlet 12 and supplies it to the hot water supply pipe connection port 13, the control unit C that controls the hot water supply unit A, and the control unit C A remote controller R for giving a command is provided. The hot water supply unit A and the control unit C are provided in the main body case K. The hot water supply pipe 4 is provided in the hot water supply pipe connection port 13 of the main body case K, and the hot water supply tap 5 is connected to the tip thereof.

In the hot water supply section A, a heat exchanger 1 for heating water,
A burner 2 that heats the heat exchanger 1 and an ignition plug 15 are provided. Further, a water inlet W1 communicating with the water inlet 12 is provided as a heated passage W2 as a hot water supply passage provided with the heat exchanger 1 for water heating and a bypass passage W3 as a water supply passage bypassing the heat exchanger 1. It is branched. Further, the downstream side of each of the heated path W2 and the bypass path W3 is connected to a hot water outlet path W4 communicating with the hot water supply pipe connection port 13. The water inlet W1 includes a water temperature thermistor S1 that detects the water inlet temperature Ti supplied to the water inlet W1 and a flow rate switch S4 that detects water flowing through the water inlet W1. And a hot water temperature thermistor S2 for detecting the hot water temperature To on the downstream side of the heat exchanger 1, the heated road W2 and the bypass road W4 at the connection points of the heated road W2, the bypass road W3 and the hot water discharge road W4.
The mixing valve 3 that adjusts the distribution ratio k of the amount of water from the hot water outlet 3 to the hot water outlet W4 is provided in the hot water outlet W4.
An outlet hot water temperature thermistor S3 for detecting the outlet hot water temperature Tm of each is installed. In the fuel supply path G1 to the burner 2, electromagnetic shutoff valves 9 and 10 and a control valve 11 for adjusting the fuel supply amount are interposed.

The structure of the mixing valve 3 will be described. As shown in FIGS. 4 and 5, a mixing valve 31, a wax pellet 32 as a temperature-sensitive expandable / contractible body, an elevating part 33, and a drive motor 34 are provided. Lifting unit 33
Are screwed to the base portion 35 of the mixing valve 3 and interlockingly coupled to the drive motor 34 via a gear mechanism 36. Then, it is driven up and down to a position corresponding to the target hot water discharge temperature Ts (upward as the target hot water discharge temperature Ts is higher). That is, the drive motor 34 corresponds to an adjusting unit that adjusts the position of the wax pellet 32. The wax pellets 32 are sandwiched between the pushing portion 33 a of the elevating portion 33 and the mixing valve 31. Here, the pushing portion 33a is urged downward and the mixing valve 31 is urged upward. The expansion amount of the expansion / contraction part 32a of the wax pellet 32 increases as the hot water outlet temperature Tm increases, and the pressing amount of the mixing valve 31 increases. Therefore, the distribution ratio k of the water amount between the heated path W2 and the bypass path W3 can be adjusted.

The remote controller R includes an operation switch 6, a target temperature setting device 7 as a target temperature setting means for setting a target hot water temperature Ts in the hot water discharge passage W4, a target hot water temperature display device 8, and a liquid crystal display device 19. Is provided.

A water temperature thermistor S1, a hot water temperature thermistor S2, a hot water temperature thermistor S3, a flow rate switch S4, and a remote controller R are connected to the control unit C. Then, the control unit C sets the shutoff valve 9 so that the outlet heated water temperature Tm in the outlet heated water passage W4 becomes the target outlet heated water temperature Ts based on the preset information stored and various input information.
10, the control valve 11, the spark plug 15, and the drive motor 34 are controlled to operate.

Further, the control section C is adapted to determine a failure of the mixing valve 3. In addition, when the difference between the outlet heated water temperature Tm in the outlet heated water passage W4 and the target outlet heated water temperature Ts exceeds a predetermined value ΔT, it is determined that the mixing valve 3 is out of order (see FIG. 3). When it is determined that there is a failure, first, a command is given to the drive motor 34 to close the bypass W3. Next, it is determined whether or not the hot water temperature To of the heated path W2 and the hot water discharge temperature Tm at that time match. If they match, the liquid crystal display 19 displays "wax pellet abnormality". On the other hand, when they do not match, the liquid crystal display 19 displays "motor abnormality". In the case of "wax pellet error",
By connecting a mixing plug to the tip of the hot water supply pipe 4, it is possible to continue hot water supply. That is, the liquid crystal display 19 corresponds to a display unit for displaying the discrimination result, and the control unit C is used to configure the control unit 100 and the discrimination unit 101.

The control of the burner 2 and the mixing valve 3 (hot water temperature control) will be described. First, the heating amount Ip of the burner 2 is set so that the hot water temperature To on the downstream side of the heated path W2 becomes a predetermined temperature (here, 70 degrees). That is, it is obtained based on the equation 1.

[0014]

## EQU1 ## Ip = Ka × (70−Ti) × Q2 + Kp × ΔT + Ki × ∫ΔTdt

Here, ΔT is a difference between 70 degrees and the hot water temperature To on the downstream side of the heat exchanger 1, Ka, Kp and Ki are constants, and Q2 is a flow rate (constant number) of the heated path W2.

Next, the distribution rate k of the amount of water is determined by the target outlet temperature T
It is determined based on s, the incoming water temperature Ti, and the outgoing hot water temperature Tm.
That is, it is obtained based on the equation 2.

[0017]

## EQU00002 ## k = Q3 / Q2 = (70-Ts) / (Ts-Ti) + Kf * (Tm-Ts)

Here, Q3 is the amount of water in the bypass W3, K
f is a constant. The correspondence relationship between the distribution ratio k and the rotation angle of the drive motor 34 is set and stored in advance, and the drive motor 34 is controlled so that the obtained rotation angle is obtained.

Next, the operation of the controller C will be described with reference to the flow charts shown in FIGS. First, the necessity of hot water supply is determined based on the information of the operation switch 6, and when hot water supply is not required, it is determined whether or not hot water supply is currently being performed. If the hot water is not being supplied up to now, it returns as it is. If the hot water is being supplied up to the present, the process returns after executing the fire extinguishing process. When it is determined that hot water supply is required, it is determined whether the flow rate switch S4 is ON. If it is OFF, it is determined whether or not hot water is being supplied up to the present time. If it is not being hot water so far, the process returns as it is. , Then return. When it is determined that the flow rate switch S4 is ON in the above determination, it is determined whether or not the ignition is being performed, and the ignition process for igniting the burner 2 is executed only when the ignition is not being performed. . Next, the burner 2 is controlled based on the equation 1 so that the hot water temperature on the downstream side of the heated path W2 becomes a predetermined temperature (70 degrees), and the mixing valve 3 is controlled based on the equation 2 Control is executed. And the hot water temperature T
It is determined whether or not the difference between m and the target hot water temperature Ts exceeds a predetermined value ΔT. If it does not exceed the limit, return as it is. On the other hand, when it exceeds, a command is given to the drive motor 34 to close the bypass W3. Next, it is determined whether or not the hot water temperature To of the heated path W2 and the hot water discharge temperature Tm at that time match. If they match, the liquid crystal display 19 displays "wax pellet abnormality". on the other hand,
If they do not match, the LCD display 19 shows "Motor error".
Is displayed.

[Other Embodiments] In the above embodiment, when it is determined that the mixing valve 3 is out of order, the bypass W3 is used.
However, the heated path W2 may be closed. In this case, it is determined whether or not the water temperature Ti of the bypass W3 and the hot water outlet temperature Tm match.

[0021] In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram of a control configuration.

FIG. 2 is a flowchart of control operation.

FIG. 3 is a flowchart of control operation.

FIG. 4 is a vertical sectional side view of the mixing valve.

FIG. 5 is a front view of the mixing valve.

[Explanation of symbols]

 3 Mixing valve 7 Target temperature setting means 19 Display means 32 Telescopic body 34 Adjusting means 100 Control means 101 Discriminating means Ts Target hot water temperature Tm Hot water temperature To, Ti Water temperature W2 Hot water supply path W3 Water supply path W4 Hot water path

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Yoshi ▼ Kozo Yama 1-52-1 Oka Minami-shi Minato-ku, Osaka-shi Osaka Prefecture Harman Co., Ltd. 1-52 Harman Co., Ltd. (72) Inventor Kenji Aoki 1-1-52 Oka, Minami-shi, Minato-ku, Osaka, Osaka

Claims (1)

(57) [Claims] 1. A mixing valve (3) for mixing hot water from a hot water supply passage (W2) and hot water from a hot water supply passage (W3) to discharge hot water to a hot water discharge passage (W4), and a target hot water discharge temperature (Ts) at the hot water discharge passage (W4). A target temperature setting means (7) for setting the temperature of the mixing valve (3), a temperature-sensitive expandable body (32) and an adjusting means (34) for adjusting the position of the expandable body (32). And are equipped to change the mixing ratio of hot and cold water,
The adjusting means (3) according to the target hot water temperature (Ts).
4) is a hot water supply control device provided with a control means (100) for giving a control command to the hot water supply temperature (Tm) in the hot water discharge passage (W4) and the target hot water temperature (Tm). Ts) exceeds a predetermined value, it is configured to give a control command to the adjusting means (34) in order to close one of the hot water supply passage and the water supply passage (W2), (W3). Water temperature (To) at the other (W2), (W3) of
A hot water supply controller provided with a determination means (101) for determining whether or not (Ti) and the hot water outlet temperature (Tm) match, and a display means (19) for displaying the determination result.