JPH10115464A - Hot-water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supply apparatus by which hot water at the start of the supply in a manner of instantaneous hot-water heater can be supplied quickly. SOLUTION: A hot-water supply apparatus has a gas burner 36 for heating a heat exchanger 10 to which a feedwater pipe 11 and a hot-water supply pipe 12 are connected, a proportional gas valve 37, a timer 32, an air detector 15, a hot-water temperature detector 18, a hot-water temperature-setting device 34, and a water-flow detector 13 which detects the flow of water. And when the water-flow detector 13 finds the water to be flowing, the hot-water supply apparatus is controlled in an ordinary manner in accordance with the hot-water temperature-setting device 34. When the flow of water is not detected by the water-quantity detector 13, following fall of the temperature below the lower limit detected by the hot-water temperature detector 18 the hot water is heated by the gas burner 36, after heating for a prescribed time set in the timer 32 the combustion is stopped, and the temperature of the heat exchanger 10 is kept high all the time so as to supply hot water quickly at the start of hot-water supply. In case of the air detector 15 detecting trapping of air, safety is secured by not resorting to the heating by the gas burner 36.

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 which can supply hot water at the start of hot water supply.

[0002]

2. Description of the Related Art Conventionally, there is a hot water supply apparatus of this type as shown in FIG. 8 (for example, Japanese Patent Publication No. 4-9972).

In FIG. 1, reference numeral 1 denotes an instantaneous water heater, and a hot water supply port 2 and an instantaneous water heater 1 are connected by a hot water supply pipe 3. A hot water supply valve 4 is provided in front of the hot water supply port 2, and a drain pipe 5 branches off from an upstream side of the hot water supply valve 4 of the hot water supply pipe 3. The drain pipe 5 is provided with a drain valve 6. . Further, a temperature detecting section 7 is provided at a branch of the drain pipe 5 from the hot water supply pipe 3, and the hot water supply control section 9 compares the set temperature of the temperature setting device 8 with the temperature of the temperature detecting section 7 to supply hot water. The valve 4 and the drain valve 6 are controlled.

When the temperature of the hot water detected by the temperature detector 7 at the time of the hot water supply request is within the allowable range of the set temperature of the temperature setting device 8, the hot water supply valve 4 is opened and the hot water in the hot water supply pipe 3 is supplied to the hot water supply port 2. In addition to the supply, when the temperature is outside the allowable range, the drain valve 6 is opened, the hot water in the hot water supply pipe 3 is discarded from the drain through the drain pipe 5, and hot water having a temperature within the allowable range is always supplied from the hot water supply port 2. is there.

[0005]

However, in the above-described conventional hot water supply apparatus, when the temperature of hot water is out of an allowable range, for example, low when the hot water is requested, the drain valve 6 is opened and the hot water supply pipe 3 is opened.
In order to perform the operation of discarding the hot water inside from the drain,
There is a problem that the time until the hot water is supplied cannot be greatly improved. Further, it is necessary to install the hot water supply valve 4, the drain pipe 5, the drain valve 6, the temperature detecting section 7 and the like by performing piping work and wiring work on site, and the installation is troublesome, and the hot water supply valve which is not necessary in a normal hot water supply device. 4, there is also a problem that members such as a drain pipe 5, a drain valve 6, and a temperature detector 7 are required.

The present invention has been made to solve the above-mentioned problems, and the hot water supply device itself has been improved so that the water supply can be quickly started at the start of the hot water supply.
Another object of the present invention is to provide a hot water supply device that can safely supply hot water.

[0007]

SUMMARY OF THE INVENTION The present invention provides a heat exchanger, a heating means for heating the heat exchanger, a heating adjusting means for adjusting the heating, a temperature detecting means for detecting a temperature near the heat exchanger, Flow detection means for detecting flow, air detection means for detecting air entrapment in the heat exchanger, and when the flow detection means does not detect the flow of water, the temperature detected by the temperature detection means falls below a predetermined temperature. Control the heating control means to start heating the heat exchanger by the heating means, stop the heating when the preset time or temperature is reached, and when the air detector detects an air bite, the heat exchanger A controller having a stop-time control unit that does not perform heating of the heat exchanger. During the stop of hot water supply, when the temperature detected by the temperature detection unit falls below a predetermined temperature, the heating control unit is controlled to control the heat exchanger by the heating unit. Start heating, oh When the temperature reaches the preset time or temperature, the heating is stopped to prevent the heat exchanger from cooling when the hot water supply is stopped. When the detector detects an air bite, it does not heat the heat exchanger, preventing it from being heated and filling the steam with heat inside the heat exchanger, causing danger to the user at the start of hot water supply. This prevents danger caused by temperature rise.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A hot water supply apparatus according to a first aspect of the present invention includes a heat exchanger in which a water supply pipe and a hot water supply pipe are connected, heating means for heating the heat exchanger, and heating by the heating means. Heating adjusting means for adjusting, temperature detecting means for detecting a temperature in the vicinity of the heat exchanger, flow detecting means for detecting a flow of water, air detecting means for detecting an air bite in the heat exchanger, When the temperature detected by the temperature detecting means is lower than a predetermined temperature when the flow of water is not detected by the flow detecting means, the heating control means is controlled to start heating the heat exchanger by the heating means. A controller that stops heating when a preset time or temperature is reached, and has a stop-time control unit that does not heat the heat exchanger by the heating means when the air detector detects air entrapment. With It is intended to formed.

Then, when the flow of water to the heat exchanger is stopped when the hot water supply is stopped, the flow detecting means detects that the flow of water is stopped. By starting heating of the heat exchanger and stopping the heating when a predetermined time or temperature is reached,
Prevents the heat exchanger from cooling when hot water supply is stopped, and enables quick supply of hot water to the terminal at the time of hot water supply at the time of re-hot water supply, and when the air detector detects air entrapment, By not performing the operation of starting heating of the heat exchanger by the heating means, heating is performed when air is trapped in the heat exchanger at the beginning of installation or after draining to prevent freezing, Are prevented from being fired.

Further, a hot water supply apparatus according to a second aspect of the present invention is configured such that, in addition to the configuration of the first aspect, an air detecting means is attached to a portion near the heating means of the heat exchanger.
Then, the air biting state of the heat exchanger portion close to the heating means, where the temperature rises quickly during idle firing, is grasped, and an appropriate control action can be taken.

Further, the hot water supply apparatus according to a third aspect of the present invention is the same as that of the first aspect, wherein the air detecting means uses a thermistor inserted in a heat exchanger, and generates self-heat by temporary energization. The configuration is such that the air bite is detected by the temperature change.

By adopting a configuration having no movable portion, a compact and highly reliable air detecting means is realized.

Further, a hot water supply apparatus according to a fourth invention of the present invention has a structure in which an air detecting means is attached to an upper portion of a heat exchanger in addition to the structure of the first invention. By providing an air detecting means on the upper part of the heat exchanger which can reliably detect even a small amount of air in the heat exchanger, the reliability of detection of the air biting state is improved.

[0014] In the hot water supply apparatus according to a fifth aspect of the present invention, a heat exchanger to which a water supply pipe and a hot water supply pipe are connected, heating means for heating the heat exchanger, and heating by the heating means are adjusted. Heat adjustment means, flow detection means for detecting the flow of water, air detection means for detecting the air bite and temperature in the heat exchanger, and when the flow detection means does not detect the flow of water, When the temperature detected by the air detection means is equal to or lower than a predetermined temperature, the heating control means is controlled to start heating the heat exchanger by the heating means, and when the temperature reaches a preset time or temperature, the heating is stopped. ,
When an air bite is detected by the air detector, a controller having a stop-time control unit that does not heat the heat exchanger is provided.

[0015] Further, it is possible to prevent the heat exchanger from being cooled when the hot water supply is stopped, to quickly supply hot water to the terminal at the time of hot water re-supply, and when the air detector detects an air bite, By not heating the heat exchanger by the heating means, heating is performed when air is biting in the heat exchanger at the initial stage of installation or after draining to prevent freezing, etc.
The structure of the heat exchanger is simplified by preventing the heat exchanger from being idled and detecting the air bite and the temperature by the air detection means by one means.

Further, in the hot water supply apparatus according to a sixth aspect of the present invention, a heat exchanger to which a water supply pipe and a hot water supply pipe are connected, a heating means for heating the heat exchanger, and a heating means for adjusting the heating of the heating means. Heating adjustment means, air detection means using heat radiation characteristics after heating the electrical resistor for detecting the presence of air in the heat exchanger or the vicinity of the heat exchanger, and air presence in the air detection means. It is provided with a controller which does not heat the heat exchanger by the heating means when detecting.

The flow detecting means detects that the flow of water to the heat exchanger has stopped when the hot water supply is stopped, and when the temperature detected by the temperature detecting means falls below a predetermined temperature, the heating adjusting means. Start the heating of the heat exchanger by the heating means, and stop the heating when the temperature reaches a predetermined time or temperature, to prevent the heat exchanger from being cooled when the hot water supply is stopped, and to the terminal at the time of hot water supply again Hot water can be supplied quickly, and when the presence of air is detected by the air detector, the heat exchanger is not heated by the heating means. Heating is performed when air is interposed in the heat exchanger after draining, etc., to prevent the heat exchanger from being fired, and to radiate the air detection means after energizing the electrical resistor. By using the characteristics, moving parts Lost, realizes the water heater has a temperature detecting possible in the resistor.

A hot water supply apparatus according to a seventh aspect of the present invention is configured such that, in addition to the configuration of the sixth aspect, the temperature of the air detecting means is compensated by a temperature based on a resistance value before heating. By detecting the temperature by the air detecting means itself, the presence of air can be accurately detected without providing a temperature detecting means for temperature compensation.

Further, the hot water supply apparatus according to the eighth aspect of the present invention is provided with temperature detecting means for detecting the temperature heated by the heat exchanger in addition to the constitution of the sixth aspect of the present invention, and compensates for the temperature of the air detecting means. This is performed based on the temperature of the temperature detecting means. By separately providing the temperature detection means, the detection of the presence of air and the detection of the temperature can be performed at the same time, and the controllability can be improved.

In a ninth aspect of the present invention, in addition to the configuration of the sixth aspect, the air detecting means includes self-heating by temporary energization of electricity and a plurality of heating elements having a predetermined time interval thereafter. It is configured by detecting the presence of air based on a change in resistance value of a point. Then, the resistance value is measured at a point in time after the transient state after self-heating, and the resistance value is measured again after a lapse of a predetermined time, so that the heat radiation characteristics can be accurately grasped, and the presence of air can be accurately determined. Things.

The air detecting means according to the tenth aspect of the present invention, in addition to the constitution of the sixth aspect, detects the air within a predetermined time after energizing the electric resistor and detects the temperature after a lapse of the predetermined time. It is configured. Then, two functions of air detection and temperature detection can be performed by one air detection means with the passage of time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a schematic configuration diagram of a hot water supply apparatus in Embodiment 1 of the present invention.

In FIG. 1, a water supply pipe 11 and a hot water supply pipe 12 are connected to a heat exchanger 10. In the water supply pipe 11,
A water amount detector 13 as flow detection means for detecting inflow of water into the heat exchanger 10 and a water temperature detector 14 for detecting water temperature are provided. An air detector 15 that uses a thermistor that detects air entrapment and complementarily detects a temperature in the middle of the heat exchanger is provided in a pipe in the middle of the heat exchanger 10. A bypass pipe 16 is provided to bypass the heat exchanger 10 and connect the water supply pipe 11 and the hot water supply pipe 12. The bypass pipe 16 has a mixing ratio of hot water from the heat exchanger 10 and water from the bypass pipe 16. Is provided with a water proportional valve 17.

The water proportional valve 17 is a valve that balances the water pressure by adjusting the current to the solenoid, and adjusts the opening of the bypass pipe 16 to adjust the amount of water passing therethrough. It is a normally open type that is held in the fully open state. A hot water temperature detector 18 is provided in the hot water supply pipe 12 near the heat exchanger 10, and a water quantity control valve 19 and a mixed water temperature detector 2 are provided after the junction of the bypass pipe 16.
0 is provided. The hot water supply pipe 12 is further connected to the hot water supply device main body 2.
It is connected to an outside hot water supply pipe 22 and communicates with hot and cold water mixing taps 23 and 24 provided at the terminal.

On the terminal side, a remote controller 2 of the water heater main body 21 is provided.
5 are provided. The remote controller 25 is of a wireless type. When the hot water mixing taps 23 and 24 are not used, in addition to the power switch 26, the hot water supply temperature up switch 27, the down switch 28, and the display unit 29 for the hot water supplied from the water heater main body 21. A heating switch 30 for selecting control under conditions different from the state in which water is flowing through the heat exchanger 10 when used is provided as selection means.

The controller 31 on the main body side has a timer 32, which is supplied with electric power from a commercial power supply and receives signals from the remote controller 25 and signals from various sensors received by the receiver 33. Signal and operation output are output.

The controller 31 is provided with a hot water temperature setting device 34 and a stop time control section 35 each of which is constituted by a volume. The heat exchanger 10 includes a gas burner 36 serving as a heating unit.
A gas proportional valve 37 is provided as a part of a heating adjusting means for adjusting the amount of gas to the gas burner 36. The gas is turned on and off by a main solenoid valve 38 which forms another part of the heating control means, and air is blown from a blower fan 39 before, after, and during combustion.
An air detector 15 provided on a pipe in the middle of the heat exchanger 10
Is mounted on a pipe facing the outside of the fin portion immediately above the gas burner 36, where the temperature tends to rise more than other parts when the flow of water is stopped.

The mounting portion of the air detector 15 is configured as shown in FIG. The air detector 15 is inserted inside the lower part 40 of the heat exchanger 10. The air detector 15 is configured such that a thermistor 42 protected by a protective tube 41 is filled with a filler 43 and a lead wire 44 is exposed to the outside. It is attached to the lower part 40. And the thermistor 42
Is temporarily heated by applying a high voltage different from that at the time of temperature detection, and after the temperature is stabilized, the resistance of the thermistor 42 is measured at a time interval. Judgment is air. Further, the air detector 15 measures the resistance value before heating by applying a voltage, judges how much the ambient temperature is, and performs a temperature compensation for accurately judging whether it is water or air. Is going. After a sufficient time has passed after the heating with the voltage applied, the lower part of the heat exchanger 40
, The temperature for heating when hot water supply is stopped is detected.

Next, the operation of this embodiment will be described. The operation is shown in the flowchart of FIG.

When the power switch 26 of the remote controller 25 is turned on <S1> and the heating switch 30 is turned on <S2>, when the hot water supply is stopped, the heat exchanger 10 is turned off.
Into a mode where heating can be performed.

If the flow rate of water detected by the water amount detector 13 in this state exceeds a predetermined value (for example, 2 l / min), it is determined that the hot water mixing tap 23 or 24 of the terminal has been opened, and the normal hot water supply mode is set. Entering <S3>, in order to supply hot water of the set temperature by operating the up switch 27, the down switch 28, etc. of the remote controller 25, the mixed water temperature detected by the mixed water temperature detector 20 is compared with the set temperature. . Further, the hot water temperature detected by the hot water detector 18 and the temperature of the hot water setter 34 are compared, and the water temperature of the water temperature detector 14 and the water amount detector 13 are compared.
Is taken in, and the water proportional valve 17, the water amount control valve 19, and the gas proportional valve 37 are adjusted, and hot water of a desired temperature is supplied from the hot water supply pipe 22 <S4>. When the flow rate of the water detected by the water amount detector 13 is equal to or less than a predetermined value (for example, 1.5 l / min), or when the hot water supply is stopped <S3>, the heating mode for the heat exchanger 10 when the hot water supply is stopped is set. It becomes possible.

Here, when the air detector 15 detects the air bite, the mode is shifted to the mode in which the control is stopped, and the burner 3 is stopped.
The heating of the heat exchanger 10 by 6 is not performed <S5>. The operation of detecting the air bite is as shown in FIG. First, the air detector 15 is energized for 1 second by raising the voltage above normal, and the thermistor 42 performs self-heating. After 1 second and 3 seconds have elapsed after the power supply is cut off, the resistance of the thermistor 42 is measured, and the state of the temperature change is determined to determine whether the surroundings are air or water. The ambient temperature affecting the heat radiation characteristics at the time of determination is determined by the hot water detector 1
Estimation is performed using the temperature of 8 and temperature compensation is performed. After a sufficient time has passed after the heating, the ambient temperature can be detected. When the temperature of the heat exchanger 10 rises abnormally, the temperature is detected complementarily.

When the temperature detected by the hot water temperature detector 18 falls below a lower limit value set as a predetermined temperature when the air detector 15 does not detect the air bite (S6), the whole hot water supply device is cooled. And the stop-time control unit 35 proceeds to advance the heating mode when the flow is stopped.

The lower limit value to be compared with the hot water temperature detector 18 is set to a value obtained by subtracting 10 ° C. from the setting value of the hot water temperature setting device 34. If the temperature detected by the hot water temperature detector 18 is equal to or lower than the lower limit, the process proceeds to the next step of the heating mode when the flow is stopped (S6). The setting of the lower limit is an example, and there are various other methods such as a method not relating to the setting of the hot water temperature setting unit 34 and a method using a fixed value.

When the temperature detected by the hot water temperature detector 18 falls below the lower limit, first, the heating time set by the timer 32 is read <S7>. Next, the water temperature detected by the water temperature detector 14 stored at the time of the last hot water supply and the current water temperature are read <S8>. This is to judge how many times the supply water temperature is and to correct the heating time and the heating start temperature.If the water temperature is high, the time is short, the temperature is low, and if the water temperature is low, the time is The time for heating the heat exchanger 10 is corrected so that the temperature becomes higher in the long run <S9>. In addition, it is useful to supply hot water having a temperature close to the set temperature of the remote controller 25 as much as possible via the hot water supply pipe 12 at the time of re-water supply.

Next, the blower fan 39 is rotated to discharge the remaining gas (S10), the original electromagnetic valve 38 is opened <S11>, and at the same time, the timer 32 starts counting time (S1).
2> The ignition of the gas proportional valve 37 is performed by opening the opening of the gas proportional valve 37 to the state of the opening 1 that facilitates ignition (S13). Next, the ignition is confirmed, and the opening of the gas proportional valve 37 is reduced to the state of the opening 2 <S
14>. This opening corresponds to the minimum opening in a state where normal hot water supply is performed. Even when heating is performed at this minimum opening, the load is small, and the temperature of the heat exchanger 10 gradually increases. Go. In addition, when the minimum heating amount can be taken extremely low as a hot water supply device, a method of keeping the temperature detected by the hot water temperature detector 18 constant is also possible.

If the temperature detected by the hot water temperature detector 18 during the heating of the heat exchanger 10 shows an abnormal change gradient, the air is caught in the heat exchanger 10 or the heating is judged to be abnormal and the heating is stopped. Yes <S15>. Hot water temperature is 60 with hot water setter 34
C. (= TO). Therefore, the lower limit, which is a predetermined value for judging the start of heating, is T1 = 60 ° C.
−10 ° C. = 50 ° C. And the upper limit T2 = 60 ° C. +
10 ° C = 70 ° C. The heating time is 5 seconds under standard conditions (water temperature 15 ° C., mixed water temperature 40 ° C.), and correction is made according to the water temperature as described above. When the timer 32 exceeds a predetermined time (5 seconds or a correction value of 5 seconds), it is considered that the time is up, and a stop operation is started (S1).
6>. In the event that the timer 32 fails or the capacity control of the gas burner 36 fails and the temperature detected by the hot water temperature detector 18 exceeds the upper limit value (70 ° C.), the original solenoid valve 38 is immediately given priority in terms of temperature. To stop operation to close <S1
7>. Also, when the temperature detected by the air detector 15 complementarily exceeds the upper limit value (70 ° C.), a stop operation for closing the original solenoid valve 38 immediately with priority on temperature is started (S18).

When the heating is stopped, the original solenoid valve 38 is closed (S19), and the blower fan 39 is rotated for a predetermined time to completely exhaust the exhaust gas, and then stopped (S20). Further, the water proportional valve 17 is fully opened after narrowing the bypass path for a predetermined time (S21). After the hot water supply is stopped after heating for a predetermined time, the temperature around the hot water temperature detector 18 slightly increases due to the post boiling. Further, the temperature around the air detector 15 further rises, and the vertical relationship between the temperatures before and after the stop is reversed. Thereafter, after the heating is stopped, the combustion is stopped until the temperature detected by the hot water temperature detector 18 becomes equal to or lower than a predetermined lower limit value.

With the above operation, the temperature of hot water at the time of stopping hot water supply is maintained at a constant value. Therefore, assuming a general household hot water supply device, in a conventional hot water supply device, in a system having a pipe length of about 5 m, it is normal that hot water is supplied in about 15 seconds after twisting a faucet of a terminal. However, according to the embodiment of the present invention, it can be reduced to about 5 seconds.

In the conventional hot water supply apparatus, it takes about 10 seconds for the hot water supply apparatus itself to rise due to the amount of retained water and the like and about 5 seconds to push out the amount of water retained in the piping. Since the rise time of the apparatus itself can be shortened, only the time for pushing out the staying water in the pipe is required.

In this embodiment, as an example of the heating means, heating by the gas burner 36 is used, but a petroleum burner or other means for electrically heating may be used.

As a heating control means, a gas proportional valve 37 is used.
And the original electromagnetic valve 38 is taken as an example, but other gas amount adjusting means or various heating adjusting means corresponding to each heating means may be used.

As the temperature detecting means for detecting the temperature in the vicinity of the heat exchanger, the hot water temperature detector 18 is taken as an example, but it may be provided separately in the heat exchanger 10 or the hot water temperature may be directly measured. The temperature outside the pipe or the heat exchanger may be detected.

Further, the flow detecting means has been described by taking the water amount detector 13 as an example. However, the flow detecting means may be indirectly linked with an operation switch for starting and stopping hot water supply, or a combination of direct and indirect. There may be.

Also, an electric method using a thermistor as the air detecting means is taken as an example, but a water level detecting method using electrodes, a method having a mechanical float, and detecting the composition of air (eg, nitrogen) And various methods such as an optical method using a difference in refractive index between water and air.

(Embodiment 2) FIG. 5 shows a second embodiment.
In the first embodiment and the second embodiment, the inflow relation of water to the heat exchanger is reversed. A water supply pipe 48 and a hot water supply pipe 49 are connected to the heat exchanger 47. The water supply pipe 48 has a water amount detector 5
0, a water temperature detector 51 is provided.

At the upper outlet of the heat exchanger 47, an air detector 52 for detecting air entrapment and for detecting the temperature of hot water exiting the heat exchanger 47 is provided. And so on. The gas proportional burner 55 and the original solenoid valve 5
A gas pipe is connected via 6. Although the structure is not the bypass system, unlike the first embodiment, the other configuration is the same, and the detailed description is omitted. The structure of the air detector 52 is the same as that shown in FIG. 2 of the first embodiment. FIG.
The operation of the air detector 52 is shown in FIG. In the second embodiment, the air detector 52 plays both roles of detecting the air bite and detecting the temperature. First, prior to energization for heating the air detector 52, temperature measurement is performed based on a resistance value for detecting an ambient temperature (1). Next, as in the first embodiment, the voltage is raised above normal and heating is performed for one second (2). Further, after waiting for one second (3), the first temperature measurement is performed based on the resistance value (4), and after waiting for another three seconds, the second temperature measurement is performed (5). A temperature change is calculated from the results of the first temperature measurement and the second temperature measurement, and it is determined whether the air is caught or the water is filled and is normal. Temperature compensation is performed using the temperature (1) stored at the time of this determination. After a further 5 seconds, it switches to the normal temperature detection function
(6) The temperature of the hot water heated by the heat exchanger is detected, and when the temperature decreases, it is used for igniting the gas burner for a predetermined time.

In this embodiment, the air detecting means is mounted on the upper part of the heat exchanger 47. This is to improve the certainty of the detection of the air bite state by providing the air detecting means on the upper part of the heat exchanger which can reliably detect the presence of air in the heat exchanger 47. The configuration is simplified by detecting the air bite and the temperature by the air detecting means by one means.

In this embodiment, a method using a thermistor is taken as an example of the air detection means for detecting the air bite and the temperature. However, the air detection and the temperature detection can be performed without using an optical method or one element. What is performed by different elements may be combined and configured as one detector structurally.

(Embodiment 3) FIG. 7 shows a third embodiment of the present invention.

A heat exchanger 59 to which a water supply pipe 57 and a hot water supply pipe 58 are connected, a ceramic heater 60 provided as a heating means for heating the heat exchanger 59, and a heating controller for controlling the heating of the ceramic heater 60 61 and heat exchanger 5
Ninth Embodiment An air detector 62 similar to that of FIG. 2 of the first embodiment utilizing the resistance change characteristic after energizing the electrical resistor for detecting the presence of air, and the air detector 62 detects the presence of air. Controller 64 having a stop-time control unit 63 that does not heat the water in the heat exchanger 59 by the ceramic heater 60
, And controls the ceramic heater 60 to obtain the temperature set by the temperature setting device 65.

In this embodiment, a flow detector is not provided since the heat exchanger 59 can store water. Hot water stored in the heat exchanger 59 and heated by the ceramic heater 60 is supplied at the time of hot water supply, and hot water is supplied at the start of hot water supply. Further, a temperature detector 66 for detecting the boiling temperature inside the heat exchanger 59 and turning off the power supply when the abnormal temperature rises is provided. By using the heat radiation characteristics of the air detector 62 after energizing the electric resistor, it is possible to eliminate the moving parts different from the method of detecting the water level with a mechanical float and detect the temperature with the resistor. The hot water supply device has been realized. Further, the temperature compensation of the air detector 62 is performed based on the temperature based on the resistance value of the air detector itself before heating is detected by the same control as in (1) of the second embodiment. The detection of the presence of air is performed by detecting the presence of air based on self-heating due to temporary energization of electricity to the air detector 62 and the resistance values at a plurality of time points after a predetermined time interval. I have. The air detector 62 also has two functions of detecting air during a predetermined time after energizing the electric resistor and detecting temperature after a predetermined time has elapsed. In addition,
The temperature of the air detector 62 can be compensated by the detected temperature of the temperature detector 66.

In this embodiment, the temperature detector 66 for detecting the boiling temperature and for safety is used as the temperature detecting means. However, only one of the functions may be used, or the heat exchanger may be used. 59 may be exposed.

[0054]

As described above, according to the hot water supply apparatus of the present invention, the following effects can be obtained.

(1) It is detected by the flow detecting means that the flow of water to the heat exchanger is stopped when the hot water supply is stopped, and when the temperature detected by the temperature detecting means falls below a predetermined temperature, the heating is adjusted. Start heating the heat exchanger by the heating means by means,
By stopping the heating when a predetermined time or temperature is reached, the heat exchanger is prevented from being cooled when the hot water supply is stopped, and the time for heating the water in the heat exchanger when the hot water is resupplied is saved. In addition, hot water can be quickly supplied to the terminal at the time of hot water supply using only the hot water supply device main body. Also, when the air detector is detecting air entrapment, the heat exchanger is not heated by the heating means, so the air inside the heat exchanger is not used during initial installation or after draining to prevent freezing. Heating is performed when the bite is chewed, thereby preventing the heat exchanger from being fired and improving safety and maintaining durability.

(2) By attaching the air detecting means to the portion near the heating means of the heat exchanger, it is possible to grasp the air biting state of the heat exchanger part close to the heating means whose temperature rises quickly during idle heating, and quickly. An accurate response can be taken.

(3) The air detecting means is simple and movable by using a thermistor inserted in the heat exchanger and detecting the presence of air by self-heating due to temporary energization and subsequent temperature change. Can be configured without any parts,
Compactness and improved reliability can be achieved.

(4) By providing the air detecting means on the upper part of the heat exchanger, even if the amount of air is small, the air entrapment can be reliably detected at the upper part of the heat exchanger where the air tends to accumulate first. Detection can be made more reliable.

(5) It is possible to prevent the heat exchanger from being cooled when the hot water supply is stopped, to save time for heating the water held in the heat exchanger at the time of re-hot water supply, and to provide a terminal for hot water supply using only the hot water supply device itself. Hot water can be supplied quickly, and when the air detector is detecting air entrapment, the heat exchanger is not heated by the heating means. When air is trapped in the heat exchanger after removal, etc., heating is performed to prevent the heat exchanger from being fired, and the air detection means can perform two functions: air bite detection and temperature detection. Thus, the configuration can be simplified.

(6) It is detected by the flow detecting means that the flow of water to the heat exchanger is stopped when the hot water supply is stopped, and when the temperature detected by the temperature detecting means falls below a predetermined temperature, the heating is adjusted. Start heating the heat exchanger by the heating means by means,
By stopping the heating when a predetermined time or temperature is reached, the heat exchanger is prevented from being cooled when the hot water supply is stopped, and the time for heating the water in the heat exchanger when the hot water is resupplied is saved. In addition, hot water can be quickly supplied to the terminal at the time of hot water supply using only the hot water supply device main body. In addition, when the presence of air is detected by the air detector, the heat exchanger is not heated by the heating means. Heating is performed when air is interposed in the heat exchanger to prevent the heat exchanger from being fired, and the air detecting means uses the heat radiation characteristics after energizing the electric resistor to move the movable part. It is possible to realize a hot water supply device that can detect temperature with a resistor.

(7) By performing temperature detection by the air detecting means itself, accurate air detection can be performed without providing a temperature detecting means for temperature compensation.

(8) Since the temperature detecting means is provided separately, the detection of the presence of air and the temperature can be simultaneously performed, and the controllability can be improved.

(9) The resistance value is measured at a point in time after the transient state after self-heating, and the resistance value is measured again after a lapse of a predetermined time. Can be determined accurately.

(10) The air detecting means performs air detection within a predetermined time after energization of the electric resistor, and performs temperature detection after the predetermined time elapses, so that one air detecting means is provided with time. Can perform two functions of air detection and temperature detection.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply apparatus according to a first embodiment of the present invention.

FIG. 2 is a cutaway sectional view of an air detector used in the water heater.

FIG. 3 is a flowchart of an operation of a main part of the water heater.

FIG. 4 is an explanatory diagram of an operation of a main part of the water heater.

FIG. 5 is a schematic configuration diagram of a hot water supply apparatus according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation of a main part of the water heater.

FIG. 7 is a schematic configuration diagram of a hot water supply apparatus according to a third embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a conventional hot water supply device.

[Explanation of symbols]

 10, 47, 59 Heat exchanger 11, 48, 57 Water supply pipe 12, 49, 58 Hot water supply pipe 13, 50 Water quantity detector (flow detection means) 15, 62 Air detector (air detection means) 18, 66 Hot water temperature detection (Temperature detecting means) 31, 64 Controller 35, 63 Stop-time control unit 36, 54 Gas burner (Heating means) 37, 55 Gas proportional valve (Heating adjusting means) 38, 56 Former electromagnetic valve (Heating adjusting means) 52 Air Detector (air detecting means, temperature detecting means) 60 Ceramic heater (heating means) 61 Heating regulator (heating regulating means)

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hirofumi Kawashima 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takashi Shire 1006 Kadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A heat exchanger to which a water supply pipe and a hot water supply pipe are connected,
Heating means for heating the heat exchanger, heating adjustment means for adjusting the heating by the heating means, temperature detection means for detecting the temperature near the heat exchanger, flow detection means for detecting the flow of water, Air detection means for detecting air entrapment in the heat exchanger; and the heating adjustment means when the temperature detected by the temperature detection means falls below a predetermined temperature when the flow detection means does not detect the flow of water. To start heating the heat exchanger by the heating means, and stop heating when a preset time or temperature is reached,
A hot water supply apparatus comprising a controller having a stop-time control unit that does not heat the heat exchanger by the heating unit when the air detector detects an air bite. 2. The hot water supply apparatus according to claim 1, wherein the air detecting means is attached to a portion of the heat exchanger near the heating means. 3. The air detecting means uses a thermistor inserted into the heat exchanger, and detects air entrapment based on self-heating caused by temporary energization of the thermistor and a subsequent temperature change. Item 2. The hot water supply device according to item 1. 4. The hot water supply apparatus according to claim 1, wherein the air detecting means is mounted on an upper part of the heat exchanger. 5. A heat exchanger to which a water supply pipe and a hot water supply pipe are connected,
Heating means for heating the heat exchanger, heating adjustment means for adjusting the heating by the heating means, flow detection means for detecting the flow of water, and air detection for detecting the air bite and temperature in the heat exchanger Means for controlling the heat adjusting means when the temperature detected by the air detecting means falls below a predetermined temperature when the flow detecting means does not detect the flow of water, and controlling the heat exchanger by the heating means. Start heating, and when the preset time or temperature is reached, heating is stopped, and when an air bite is detected by the air detector, a control having a stop time control unit that does not heat the heat exchanger is performed. A hot water supply device with a water heater. 6. A heat exchanger to which a water supply pipe and a hot water supply pipe are connected,
Heating means for heating the heat exchanger, heating adjustment means for adjusting the heating of the heating means, and resistance after energization to the heat exchanger or an electric resistor for detecting the presence of air near the heat exchanger. A hot water supply apparatus comprising: an air detection unit using a change characteristic; and a controller that does not heat the heat exchanger by the heating unit when the air detection unit detects the presence of air. 7. The hot water supply apparatus according to claim 6, wherein the temperature of the air detecting means is compensated based on a temperature based on a resistance value of the air detecting means before heating. 8. The hot water supply apparatus according to claim 6, further comprising a temperature detecting means for detecting a temperature heated by the heat exchanger, wherein the temperature of the air detecting means is compensated based on the temperature of the temperature detecting means. 9. The air detecting means according to claim 6, wherein said air detecting means detects the presence of air based on self-heating due to temporary energization of electricity and resistance values at a plurality of time points at predetermined time intervals thereafter. Water heater. 10. The hot water supply apparatus according to claim 6, wherein said air detection means detects air during a predetermined time after energizing the electric resistor, and detects temperature after a predetermined time has elapsed.