JP3207981B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for preventing hot water from being supplied when a hot water supply heat exchanger has an abnormally high temperature.

[0002]

2. Description of the Related Art In a conventional hot water supply apparatus, when the temperature of a heat exchanger becomes abnormally high, an electromagnetic valve or a gas proportional valve constituting a heating unit is controlled to stop a gas burner, thereby heating the heat exchanger. A hot water supply device having an overheating prevention function to prohibit is known.

[0003]

In the conventional hot water supply apparatus, even if the abnormal high temperature of the heat exchanger is detected and the combustion of the heating section is stopped, the hot water accumulated in the heat exchanger is heated to a high temperature. ,
When hot water supply is started in this state, there is a problem that hot water is discharged.

[0004] Further, a bypass pipe connecting the water supply pipe and the hot water supply pipe by bypassing the heat exchanger is provided, and a mixing valve is provided at a connection portion between the bypass pipe and the hot water supply pipe so that the hot water passing through the heat exchanger can be supplied. Even in a bypass / mixing hot water supply device configured to supply hot water at a desired temperature by mixing with water passing through a bypass pipe, if the mixing valve is fully opened at the start of hot water supply, There is a problem that high-temperature hot water is discharged due to a time delay in adjusting the mixing valve in the hot water side closing direction.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a highly safe hot water supply apparatus for preventing hot water from being discharged at the time of hot water supply even if the hot water supply heat exchanger becomes abnormally high. To provide.

[0006]

According to the present invention, there is provided a hot water supply apparatus comprising: a hot water supply stop valve for stopping hot water supply in a hot water supply path; and a hot water supply stop control means for controlling the hot water supply stop valve based on an overheat signal. Are provided.

Further, the hot water supply apparatus according to the present invention is characterized in that mixing valve control means for controlling a mixing valve so as to forcibly stop high-temperature hot water supply based on an overheat signal is provided.

[0008]

According to a first aspect of the present invention, there is provided a hot water supply apparatus including a hot water supply stop valve and a hot water supply stop control means. Since the hot water supply stop control means closes the hot water supply stop valve, it is possible to prevent hot water from being discharged at the time of hot water supply.

A hot water supply apparatus according to a second aspect of the present invention is provided with mixing valve control means for controlling a mixing ratio between the mixing valve and the mixing valve, and when the overheat sensor detects an abnormally high temperature of the hot water supply heat exchanger, Since the mixing ratio of the mixing valve is appropriately controlled based on the overheating signal of the overheating sensor, it is possible to prevent hot water from being discharged at the time of hot water supply.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram in the case where the hot water supply device according to claim 1 is configured by a one-can two-channel water heater. In FIG. 1, a one-can two-channel hot-water supply device 1 includes a water supply pipe 2, a hot water supply pipe 4, and a hot water tap 2 connected to a hot water supply heat exchanger 3.
0, a hot water supply system connected to the additional heating heat exchanger 8, a bath circulation system including the return pipe 9, and the bathtub 21, a control means 11, a hot water temperature setting unit 12A, an additional heating switch 12B, The remote control device 12 includes a bath temperature setting unit 12C and the like, and a heating unit including a solenoid valve 13, a gas proportional valve 14, and a gas burner 15.

The hot water supply pipe 4 of the hot water supply system includes a hot water supply stop valve 5 for controlling supply / stop of hot water supplied to the hot water tap 20. A flow sensor 16 for detecting a flow rate Q and a feed water temperature sensor 1 for detecting a feed water temperature Tc are provided in the feed pipe 2 of the hot water supply system.
7. An overheating sensor 6 for detecting an abnormally high temperature (overheating signal) Ta of the hot water supply heat exchanger 3, and a hot water supply temperature sensor 18 for detecting the hot water supply temperature Tm in the hot water supply pipe 4, respectively.

The bath circulation system is provided with a bath temperature sensor 19 for detecting the temperature Tfc of hot water at the outlet of the bathtub 21 and a circulation pump 10 in the outflow pipe 7 of the bath circulation system.
When the reheating switch (SW) 12B is pressed to set the bath set temperature Tfs from the bath temperature setting unit 12C, the circulation pump 10 is driven to start reheating.

The control means 11 includes a flow rate Q, a hot water supply set temperature T
s, the water supply temperature Tc, the hot water supply temperature Tm, the bath temperature Tfc, the heat amount required for hot water supply, the heat amount required for additional heating of the bath, the heating control, the driving of the bath circulation pump, etc. It is configured to perform various calculations, processes, and controls.

The control means 11 is a hot water supply stop control means 4
When the superheat sensor 6 detects an abnormally high temperature (superheat signal) Ta of the hot water supply heat exchanger 3, the heating is stopped by controlling the solenoid valve 13 and the hot water supply stop valve 5 is closed to stop the hot water supply. The configuration is as follows.

FIG. 2 is a block diagram of a main part of the control means according to the first aspect. In FIG. 2, the control means 11 comprises a microprocessor, various interface circuits, a memory and the like, and has a calorie computing unit 30, a hot water supply / reheating unit 3
1, a heating control unit 32, a circulating pump control unit 35, and a hot water supply stop control unit 40.

The calorific value calculating section 30 has a flow rate Q, a set temperature T
s, the supply water temperature Tc, and the hot water supply temperature Tm, to calculate the required heat amount and the feedback heat amount at the time of hot water supply, or to calculate the required heat amount at the time of additional heating based on the bath temperature Tfc and the bath set temperature Tfs, and calculate the heat amount calculation information Fo. Heating control unit 3
2 provided. The calorific value calculation at the time of hot water supply or additional heating and the output control of the calorific value calculation information Fo are performed by the determination information Ho1 and Ho2 output from the hot water supply / reheating unit 31.

The hot water supply / reheating unit 31 determines a standby state, a hot water supply state, and a reheating state based on the flow rate information Q and the reheating switch information SW, and determines judgment information Ho1, Ho.
2 is output. In the case of only the flow rate information Q, for example, the determination information is determined as the hot water supply state and the determination information Ho1 is output, and in the case of only the additional heating switch information SW, the determination is made as the additional heating state and the determination information Ho2 is output. No judgment information in standby state, judgment information Ho when using hot water / additional heating at the same time
1. It is configured to output Ho2 simultaneously. Further, the determination information is digitally encoded, and for example, a standby state (0, 0),
The hot water supply state (0, 1), the additional heating state (1, 0), and the hot water supply / additional heating simultaneous use state (1, 1) may be adopted.

The heating control unit 32 includes a proportional valve control unit 33,
An electromagnetic valve control unit 34 is provided. The proportional valve control means 33 includes:
Based on the calorie calculation information Fo output from the calorie calculator 30, a calorie-valve opening table stored in advance in a memory such as a ROM is referred to, and the valve opening corresponding to the calorie calculation information Fo is called from the memory. Proportional valve drive signal X according to valve opening
h is sent to the gas proportional valve 14, and the gas proportional valve 14 is adjusted to the valve opening corresponding to the calorie calculation information Fo.

The solenoid valve control means 34 opens the solenoid valve 13 based on the hot water supply determination information Ho1 or the hot water determination information Ho2 provided from the hot water / reheating unit 31.
When the determination information Ho1 and Ho2 are not provided, the control is performed so that the electromagnetic valve 13 is closed. The solenoid valve control means 34
The solenoid valve drive signal Xd is sent to the solenoid valve 13 to open / close the solenoid valve 13 in response to the state determined by the hot water / reheating unit 31.
Close.

The circulating pump control means 35 outputs the circulating pump driving signal Jo and controls the driving of the circulating pump 10 only when the hot water / reheating determining unit 31 provides the additional heating determination information Ho2.

The hot water supply stop control means 40 includes an abnormal temperature detecting section 41, a timer section 42, a signal holding section 43, and a valve driving section 44, and detects an abnormally high temperature (overheat signal) of the hot water supply heat exchanger 3 detected by the overheat sensor 6. The hot water supply stop valve 5 is configured to be controlled to close based on Ta.

The overheat sensor 6 employs a bimetal-type overheat prevention device composed of, for example, a heat sensitive portion, a bimetal, an electric circuit contact, and the like, and the abnormal temperature Ta of the hot water supply heat exchanger 3 exceeding a predetermined temperature at the heat sensitive portion. When the heat is detected, the bimetal is driven to open the electric circuit contact, thereby detecting the abnormally high temperature Ta.

The abnormal temperature detecting section 41 is constituted by, for example, a Schmitt trigger gate having a hysteresis characteristic, and an overheat prevention device constituting the overheat sensor 6 detects an electric output (H level or L level) when the abnormal temperature Ta is detected. The detection information Ha corresponding to the arbitrarily configurable heating signal is supplied to the signal holding unit 43.

The timer section 42 starts time counting by using an electrical output (overheat signal Ta) from the overheat sensor 6 as a trigger.
The detection information Ha supplied to the signal holding unit 43 is set to a predetermined time T
o Monitor. The signal holding unit 43 holds (latches) the detection information Ha when the detection information Ha continues for a predetermined time To.
And the holding signal So is sent to the valve drive unit 44 and the heating control unit 32
To the solenoid valve control means 34. When the overheat sensor 6 detects the abnormal temperature Ta for a predetermined time To even once, the holding signal So maintains the latched state even if the heating is stopped and the output of the overheat sensor 6 is lost, and this state is maintained for maintenance or repair. It is configured to continue until a reset switch (not shown) provided on the remote control device 12 or the like is operated.

When receiving the holding signal So, the valve drive section 44 sends a valve closing signal Ko to close the hot water supply stop valve 5 and forcibly stop the hot water supplied from the hot water supply pipe 4. Further, the holding signal So is provided to the solenoid valve control means 34, and the solenoid valve control means 34 sends the solenoid valve drive signal Xd to the solenoid valve 13 to control the solenoid valve 13 to forcibly close.

FIG. 3 is a block diagram showing another embodiment of the hot water supply stop control means. In FIG. 3, hot water supply stop control means 45
2 is different from the hot water supply stop control means 40 of FIG. 2 in that a comparison unit 46 and a temperature storage unit 47 are provided. Further, in place of the overheat sensor 6 using the overheat prevention device of FIG.
A is adopted.

The comparing section 46 is constituted by a comparing circuit such as a comparator, and compares the abnormally high temperature Ta of the hot water supply heat exchanger 3 detected by the temperature sensor 6A with a reference temperature Tk preset in a memory such as a ROM. (Overheating signal) When Ta exceeds the reference temperature Tk (Ta> Tk), the comparison information Hk is output to the signal holding unit 43 and the timer unit 42.

The signal holding section 43, the timer section 42, and the valve driving section 44 operate in the same manner as the hot water supply stop control means 40 shown in FIG. 2, monitor the comparison information Hk for a predetermined time To, and output the valve closing signal Ko to stop the hot water supply. The hot water supply is sent to the valve 5 and the hot water supply stop valve 5 is forcibly closed to stop the hot water supply.

FIG. 4 is an overall configuration diagram in the case where the hot water supply device according to claim 2 is constituted by a one-can, two-channel water supply device. In FIG. 4, the one-can-two-channel hot-water supply device 50 includes a bypass pipe 22 that connects the water supply pipe 2 and the hot water supply pipe 4 by bypassing the hot water supply heat exchanger 3, and a mixing valve at a connection portion between the bypass pipe 22 and the hot water supply pipe 4. 23 is different from the one-can-two-channel water heater 1 of FIG. 1 in that a heat exchange temperature sensor 24 for detecting a heat exchange outlet temperature Th at the outlet of the hot water supply heat exchanger 3 is provided and a hot water supply stop valve 5 is removed. Also, 1
The can 2 canal hot water supply apparatus 50 is different from the control means 51 in that the mixing valve control means 52 is provided in the control means 51 and the hot water supply stop control means 40 is omitted.
Is different from the control means 11.

FIG. 5 is a block diagram of a main part of the control means according to the second aspect. In FIG. 5, a control means 51 is composed of a microprocessor, various interface circuits, a memory, and the like, and has a calorific value calculating unit 30, a hot water supply / reheating unit 3
1. It comprises a heating control section 32, a circulation pump control means 35, and a mixing valve control means 52. The calorific value calculation unit 30, the hot water supply / reheating unit 31, the heating control unit 32, and the circulation pump control unit 35 have the same configuration and operation as the control unit 11 of FIG.

The mixing valve control means 52 includes an abnormal temperature detecting section 4
1, a timer unit 42, a signal holding unit 43, a mixing ratio calculation unit 53 for additional heating, a mixing ratio calculation 54 for hot water supply, a switching unit 55, a fully closed output unit 56, and a mixing valve control unit 57. The abnormal temperature detecting section 41, the timer section 42 and the signal holding section 43 are shown in FIG.
And the operation is the same as that of the control means 11, and the detailed description is omitted.

The additional-heating-time mixing-ratio calculator 53 calculates the mixing ratio α1 of the mixing valve 23 on the hot side of the mixing valve 23 in advance during additional heating, assuming that hot water supply is started during additional heating. From the heat exchange outlet temperature Th, hot water supply set temperature Ts, and water supply temperature Ts in FIG. 4, α1 ｛= (Ts−Tc) / (Th−
Tc)｝ is calculated, and the mixing ratio information α1 at the time of additional heating is connected to one end of the contact point of the switching unit 55.

[0033] The hot water at the mixing ratio calculating unit 54, PID based on the deviation of the hot water supply <br/> set temperature Ts and the hot water supply temperature Tm of FIG. 4
(Proportional, integral, differential) calculation result fPID (Ts-Tm) plus mixing ratio α1 to calculate mixing ratio α2 ｛= α1 + fPID (Ts-Tm)｝ of mixing valve 23 during hot water supply, and hot water mixing ratio information α2 is connected to the other end of the terminal of the switching unit 55.

The switching unit 55 is composed of, for example, an electronic switch having two terminals and a control terminal, and the hot water mixing ratio information corresponding to the judgment information Ho1 and Ho2 output from the hot water / reheating unit 31. α2 and the mixing ratio information α1 at the time of additional heating are selected, and output to the mixing valve control unit 57 as mixing ratio information αk.

The fully closed output means 56 stores the fully closed mixing ratio information αo of the hot water side fully closed (mixing ratio = 0) of the mixing valve 23 in advance, and receives the holding signal So from the signal holding unit 43, The closed mixing ratio information αo is output to the mixing valve control unit 57.

When the mixing ratio information αk is supplied from the switching unit 55, the mixing valve control unit 57 outputs a mixing valve driving signal Xm corresponding to the value of αk (α1 or α2), The opening is adjusted according to the mixing ratio α1 at the time of additional heating or the mixing ratio α2 at the time of hot water supply. Further, upon receiving the fully closed mixing ratio information αo from the fully closed output means 56, the mixing valve control unit 57 outputs a mixing valve stop signal Xms based on the fully closed mixing ratio information αo in preference to the mixing ratio information αk. Then, control is performed such that the hot water side valve of the mixing valve 23 is closed to forcibly stop hot water supply.

When the holding signal So is output, the solenoid valve control unit 34 sets the solenoid valve 1 in the same manner as the control unit 11 of FIG.
Close 3 to forcibly stop heating.

[0038] Thus, the control means 51, the abnormal high temperature (overheating signal) overheating sensor 6 during the hot water supply is hot water supply heat exchanger 3 T
a, a holding signal So is output, and the mixing valve control unit 5
7, the hot-water-side valve of the mixing valve 23 is closed to forcibly stop high-temperature hot water supply, and the electromagnetic valve 13 is closed via the electromagnetic valve control means 34 to control to forcibly stop heating.

The mixing valve control means 52 uses a temperature sensor 6A instead of the overheat sensor 6 as shown in FIG. 3, and replaces the abnormal temperature detection section 41 with the comparison section 46 and the temperature storage section 47.
And the hot water supply stop control means 4
5 can be configured in the same manner.

FIG. 6 is a diagram showing an embodiment having a branch valve. The mixing valve control means (5) according to claim 2, wherein a branch valve (23A) is used in place of the mixing valve (23) of the one-can two-channel hot-water supply device (50) of FIG.
2 can be similarly applied.

[0041]

As described above, the hot water supply apparatus according to the first aspect includes the hot water supply stop valve and the hot water supply stop valve control means,
When the overheat sensor detects an abnormally high temperature of the hot water supply heat exchanger, the hot water supply stop valve control means forcibly closes the hot water supply stop valve based on the overheat signal output by the overheat sensor. Hot water can be prevented from flowing out.

Further, the hot water supply apparatus according to claim 2 is provided with a mixing valve and mixing valve control means, and when the superheat temperature sensor detects an abnormally high temperature of the hot water supply heat exchanger, the mixing is performed based on the superheat signal output by the superheat sensor. Since the valve control means forcibly closes the hot water side of the mixing valve, it is possible to prevent hot water heated by the hot water supply heat exchanger from being discharged.

Accordingly, a highly safe hot water supply device capable of preventing hot water from being discharged can be provided.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a one-can two-channel water heater according to claim 1.

FIG. 2 is a block diagram of a main part of the control means according to claim 1;

FIG. 3 is a block diagram showing another embodiment of the hot water supply stop control means.

FIG. 4 is an overall configuration diagram of a one-can two-channel water heater according to claim 2;

FIG. 5 is a block diagram of a main part of the control means according to claim 2;

FIG. 6 is a configuration diagram of an embodiment including a branch valve.

[Explanation of symbols]

 1, 50 1 can 2 canal hot water supply device 2 water supply pipe 3 hot water supply heat exchanger 4 hot water supply pipe 5 hot water supply stop valve 6 overheat sensor (Ta) 6A temperature sensor (Ta) 7 outgoing pipe 8 additional heating heat exchanger 9 return pipe 10 circulation Pump 11, 51 Control means 12 Remote control device 13 Solenoid valve 14 Gas proportional valve 15 Gas burner 16 Flow rate sensor 17 Water supply temperature sensor (Tc) 18 Hot water supply temperature sensor (Tm) 19 Bath temperature sensor (Tfc) 20 Hot water tap 21 Bathtub 22 Bypass pipe Reference Signs List 23 mixing valve 23A branch valve 24 heat exchange temperature sensor (Th) 30 calorific value calculating unit 31 hot water supply / reheating unit 32 heating control unit 33 proportional valve control means 34 solenoid valve control means 35 circulating pump control means 40, 45 hot water supply stop control Means 41 Abnormal temperature detection unit 42 Timer unit 43 Signal holding unit 44 Valve driving unit 46 Comparison unit 47 Temperature storage (Tk) 52 Mixing valve control means 53 Mixing ratio calculation unit during additional heating 54 Mixing ratio calculation unit during hot water supply 55 Switching unit 56 Fully closed output means 57 Mixing valve control unit Ta Abnormal high temperature (overheat signal) Ha detection information So holding signal Ko Valve closing signal αk mixture ratio information αo fully closed mixture ratio information

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Maruyama 431-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Prefecture Inside Nippon Yupro Corporation (72) Inventor Hiroshi Miura 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo (56) References JP-A-6-147640 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/10 303

Claims (2)

(57) [Claims] 1. A hot water supply heat exchanger provided in a hot water supply path for heating water supplied from a water supply pipe and supplying the water to the hot water supply pipe, a heating unit for heating the hot water supply heat exchanger, and the hot water supply heat exchanger An overheat sensor that detects an abnormally high temperature of the hot water and outputs an overheat signal; and a hot water supply device that stops heating of the heating unit based on the overheat signal; a hot water supply stop valve that stops hot water supply in the hot water supply path; A hot water supply apparatus comprising hot water supply stop control means for controlling the hot water supply stop valve based on an overheat signal. 2. A hot water supply heat exchanger provided in a hot water supply path for heating water supplied from a water supply pipe and supplying the hot water to the hot water supply pipe, a heating unit for heating the hot water supply heat exchanger, and the hot water supply heat exchanger A bypass pipe connected to the water supply pipe and the hot water supply pipe by bypassing the hot water passing through the hot water supply heat exchanger and the water passing through the bypass pipe to mix hot water at a set temperature into the hot water supply pipe. A mixing valve to be supplied, and a superheat sensor that outputs an overheat signal by detecting an abnormally high temperature of the hot water supply heat exchanger, wherein the hot water supply device stops heating the heating unit based on the overheat signal. I will forcibly stop hot water supply based on
Water heater, characterized in that a mixing valve control means for controlling the urchin the mixing valve.