JP2637831B2 - Hot water supply apparatus and hot water temperature control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a hot water supply apparatus that suppresses fluctuations in hot water temperature that occur when a hot water supply apparatus is used continuously, and a method for controlling the hot water temperature.

[Prior art]

Recently, some hot water supply apparatuses have a function of setting a tapping temperature. In such a hot water supply apparatus, a hot water having a desired hot water temperature is obtained by adjusting a mixing ratio of hot water and water in a hot water mixing means based on a setting signal of a hot water temperature. In the hot water mixing means used in this hot water supply device, a valve device for adjusting the amount of hot water and water introduced is provided with a thermal expansion material, so that the hot water temperature fluctuation from the heat exchanger and the water temperature fluctuation can be reduced. Even if there is, the mixing ratio of hot water and water is finely adjusted by adjusting the valve body opening with the thermal expansion material of the valve device so that hot water at the set hot water temperature can be discharged. There is.

[Problems to be solved by the invention]

By the way, this hot water mixing means has a drawback that the tapping temperature fluctuates when continuously used. For example, as shown in FIG. 4, at the start of hot water supply after the stop of hot water supply, the temperature of the hot water to be discharged fluctuates instantaneously. This is because the hot water remaining in the heat exchanger rises due to the post-boiling of the heat exchanger, which heats the thermal expansion material of the valve device of the hot water mixing means. This is because the valve body opening is adjusted so as to reduce the inflow of hot water, for example, after stopping hot water supply for 30 seconds, when the operation is resumed, the valve body opening of the hot water mixing means remains unchanged. The hot water is discharged, and a so-called undershoot occurs in which the temperature of the hot water that is discharged is lower than the set hot water temperature. After about 3 minutes from the stop of hot water supply, the temperature of the hot water staying in the heat exchanger decreases, and the thermal expansion material of the valve device of the hot water mixing means shrinks to discharge hot water at the set hot water temperature. The opening degree of the valve body is adjusted so as to increase the inflow temperature of the hot water, and as a result, a so-called overshoot occurs in which the temperature of the hot water discharged immediately after the start of the operation is temporarily increased. Furthermore, when the piping from the water heater to the hot water tap is short, the mixing of the hot water and the water is insufficient, and the outlet temperature fluctuates in a range of about 3 ° C. Therefore, an object of the present invention is to provide a hot water supply apparatus and a hot water temperature control method for stabilizing fluctuations in tapping temperature when using such hot water mixing means.

[Means for Solving the Problems]

In order to solve the above-mentioned problem, a hot water supply device of the present invention includes a heat exchanger in which a water supply pipe is connected to a water introduction side, the supply water is heated by heat from a heat source to make hot water, a water inlet, and hot water introduction. A housing having a mouth and a tap hole, a heat expansion / contraction member that expands / contracts depending on the temperature of the hot water, and a valve body whose position is adjusted by a shaft member that moves forward / backward by driving means; A pipe is connected to supply water and receives hot water from the heat exchanger at the hot water inlet, and the drive means moves the shaft member forward and backward to change the position of the valve body between the water side and the hot water side. The mixing ratio of water and hot water is changed by doing, and the position of the valve body is corrected by expanding and contracting the thermal expansion and contraction member with hot water obtained by mixing water and hot water, and from the tap hole. Lower the temperature of the hot water Hot water mixing means, a remote control means for setting a temperature of the hot water flowing out of the hot water outlet of the hot water mixing means, and a valve body of the hot water mixing means by controlling the drive means by the temperature set by the remote control means The position of the valve body is adjusted based on the set hot water temperature by adjusting the position of the hot water flowing out of the hot water outlet and setting the temperature of the hot water flowing out of the hot water outlet and measuring the elapsed time from the stop of hot water to the time of hot water re-starting. And control means for adjusting the amount by a predetermined amount. Further, the hot water temperature control method of the hot water supply device of the present invention, in the hot water supply device, after performing a hot water supply operation according to the set hot water temperature,
The timer is started by stopping the operation, and the valve body of the hot water mixing means is adjusted to a position higher by a predetermined temperature than the position of the set hot water temperature, and restarting is started before a predetermined time has elapsed from the stop of the operation. In such a case, the hot water supply is started at the adjusted position of the valve body adjusted at the time of the stop of the operation, and when a predetermined time has elapsed from the stop of the operation, the temperature is lowered by a predetermined temperature from the set temperature at the time of the stop of the operation. It is characterized in that the position of the valve element of the hot water mixing means is adjusted and, at the time of re-operation, tapping is started at the adjusted position.

[Action]

According to the hot water supply apparatus and the hot water temperature control method of the present invention, the operation of the hot water is started together with the stoppage of the hot water, while the hot water mixing means and the hot water are heated to a predetermined temperature higher than the set hot water temperature. If the mixing ratio of water and water is adjusted and the operation is restarted immediately after the operation is stopped, the hot water is supplied in the state of the mixing ratio, and if the operation stop time exceeds a predetermined time, the hot water mixing means is set. Since the hot water is adjusted so that the temperature becomes lower by a predetermined temperature than the hot water temperature, the undershoot that occurs when the operation is started again immediately after the operation is stopped and the overshoot that occurs when the operation is started after the predetermined time is stopped are suppressed. Thus, it becomes possible to supply hot water having a stable hot water temperature.

【Example】

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. 1 to 3 show one embodiment of the hot water supply apparatus and the hot water temperature control method of the present invention. In FIG.
The hot water supply device 1 includes a heat exchanger 2 and an electric thermo-mixing valve 3 as hot water mixing means for mixing hot water from the heat exchanger 2 with water. It is connected to a water inlet 6 of the heat exchanger 2 and a water inlet (described later) of the electric thermo-mixing valve 3, and has a hot water outlet 7 of the heat exchanger 2 and a hot water inlet (described later) of the electric thermo-mixing valve 3. And are linked. The electric thermo-mixing valve 3 includes remote control means 8
Is connected via a controller 9 built in the hot water supply apparatus 1, and by operating the remote control means 8, the temperature of the hot water to be discharged can be set in advance.
The signal relating to the set hot water temperature is introduced into the controller 9,
The controller 9 has a function of sending a signal for adjusting the mixing ratio of hot water and water to the electric thermo mixing valve 3 to obtain hot water having a desired hot water temperature. The controller 9
Is provided with a timer (not shown) for transmitting and receiving a detection signal and an operation control signal to and from the components of the hot water supply apparatus 1 and for measuring the operation stop time. Reference numeral 10 denotes a gas burner. Here, the electric thermo mixing valve 3 will be described. As shown in FIG. 2A, the electric thermo-mixing valve 3 includes a water inlet 12 formed by connecting a water supply pipe 5 to a housing 11 and a hot water connected to a hot water outlet side 7 of the heat exchanger 2. An inlet 13 and a tap 14 for tapping hot water and water mixed in the housing 11 are formed. In the housing 11, a pair of valve guides 15 are provided between the water inlet 12 and the hot water inlet 13, and a valve seat 16 is disposed between the pair of valve guides 15. The valve element 17 is supported via a spring member 18 provided on the valve seat 16, and is attached to one end of a shaft member 19 having a built-in thermal expansion member. In addition, a flow port 20 is formed in the valve element 17. A hollow adjusting member 21 for determining the initial position of the shaft member 19 is attached to the other end of the shaft member 19, and the other end of the shaft member 19 is elastically moved by a spring member 22 fitted to the adjusting member 21. Is held. The adjustment member 21 is provided with a drive source and a motor 23 for moving the adjustment member 21 in the long axis direction. For the electric thermo-mixing valve 3 having the above configuration, a setting signal of the hot water temperature input by the remote control means 8 is outputted to the motor 23 via the controller 9. Based on this, the motor 23 is
By moving 21 in the longitudinal direction against the elastic force of the spring member 22, the initial opening of the valve pair 17 is adjusted, and the amount of warm water and water flowing into the housing 11 is adjusted. Mix to obtain hot water at the set hot water temperature. In that case, the heat expansion member provided on the shaft member 19 expands and contracts by heat, displacing the shaft member 19 in the axial direction, and the hot water temperature of the flowing hot water,
The opening and closing adjustment of the valve pair 17 is automatically performed in order to correct the influence of the water temperature fluctuation. In such a configuration, a method of controlling the hot water temperature of the hot water supply device will be described. The temperature of the hot water to be discharged is set in the remote control means 8 in advance. This is the set hot water temperature. A signal relating to this setting is introduced into the controller 9, and the controller 9 outputs a control command to the electric thermo mixing valve 3 to adjust the mixing ratio so as to correspond to the set hot water temperature. That is,
A signal corresponding to the setting signal of the hot water temperature input to the remote control means 8 is output from the controller 9 to the motor 23 of the electric thermo-mixing valve 3, and based on this, the motor 23 is controlled by the adjusting member 21. Is moved in the longitudinal direction against the elastic force of the spring member 22 to adjust the initial opening of the valve element 17 in the housing 11 of the electric thermo-mixing valve 3 and to flow into the housing 11 The hot water to be heated and the amount of water are adjusted, and control is performed so that hot water having the set hot water temperature is obtained. When the operation is started in such a state, the water supplied to the water supply pipe 5 is supplied to the water inlet 6 of the heat exchanger 2 and the water inlet 12 of the electric thermo-mixing valve 3 via the inflow detecting means 4.
Then, in the electric thermo-mixing valve 3, the hot water heated by the heat exchange action of the heat exchanger 2 and the water are mixed so as to reach the set hot water temperature, so that hot water having the set hot water temperature can be obtained. Next, when the hot water is stopped, the flowing water detecting means 4 is turned off, and the time for the operation stop time is started when the combustion is stopped. At this time, as shown in FIG. 2 (b), the controller 9 sends a control command to the electric thermo mixing valve 3 so as to increase the temperature by 5 to 6 ° C. as compared with the set hot water temperature, and Increase inflow. That is, the adjusting member 21 of the electric thermo-mixing valve 3 is actuated to open the flow port 20 on the side of the hot water inlet 13 in the valve element 17 so as to increase the flow rate of hot water (FIG. 2 ( c)). Then, when the operation is started after the operation is stopped, for example, after about 30 seconds, the hot water is supplied to the electric thermo-mixing valve 3 in an adjustment state 5 to 6 ° C. higher than the set hot water temperature. For this reason, due to a delay in ignition of the gas burner 10, the supply ratio of the cold water increases, and the undershoot in which the temperature of the hot water discharged from the hot water temporarily decreases as compared with the set hot water temperature is reduced, and the stable hot water temperature is reduced. Hot water can be supplied (see FIG. 3). Next, when the operation stop time exceeds a predetermined time, for example, three minutes, the electric thermo-mixing valve 3 is adjusted to be lower by 5 to 6 ° C. than the set hot water temperature (second).
Figure (b). And the electric thermo mixing valve 3
The hot water supply operation is performed in this adjustment state (FIG. 3).
Therefore, it is possible to effectively suppress an overshoot in which the temperature of the hot water temporarily rises due to post-heating, such as abnormally heating the water remaining in the heat exchanger 2 due to the stoppage of the water supply.

【The invention's effect】

As described above, according to the present invention, even when the time interval between tapping is long and when tapping and tapping are repeatedly performed in a short time, regardless of the tapping mode, the operation is restarted immediately after the stoppage. Undershoot that occurs when
Overshoot that occurs when the operation is started after stopping for a predetermined time is suppressed, and the temperature of the tap water can be stabilized.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a hot water supply apparatus according to the present invention, and FIGS. 2 (a), 2 (b) and 2 (c) show an example of an electric thermo-mixing valve and its operation. Explanatory diagram, FIG. 3 is a diagram showing the characteristics of tapping temperature of the hot water supply device shown in FIG. 1, and FIG. 4 is a diagram showing tapping temperature characteristics of the conventional hot water supply device. DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus 2 ... Heat exchanger 3 ... Electric thermo mixing valve 4 ... Running water detection means 5 ... Water supply pipe 6 ... Water introduction side 7 ... Hot water outlet side 8 ... Remote control means 9 ... Controller 10 Gas burner 11 Casing 12 Water inlet 13 Hot water inlet 14 Hot water outlet 15 Valve guide 16 Valve seat 17 Valve 18 Spring member 19 ... Shaft member 20 ... Communication port 21 ... Adjusting member 22 ... Spring member 23 ... Motor

Claims (2)

(57) [Claims] A water supply pipe is connected to a water introduction side, and a heat exchanger that heats the supply water with heat from a heat source to generate hot water; and a housing having a water inlet, a hot water inlet, and a hot water outlet, A heat expansion / contraction member that expands and contracts by the temperature of the hot water is provided in part, and a valve body whose position is adjusted by a shaft member that moves forward and backward by a driving unit is provided, and the water supply pipe is connected to the water supply pipe to be supplied with water. Mixing ratio of water and hot water by receiving hot water from the heat exchanger at the hot water inlet and moving the shaft member forward and backward by the driving means to change the position of the valve body between the water side and the hot water side Has been changed, and
Correcting the position of the valve body by expanding and contracting the thermal expansion and contraction member with hot water obtained by mixing water and hot water,
Hot water mixing means for stabilizing the temperature of hot water flowing out of the hot water outlet; remote control means for setting the temperature of hot water flowing out of the hot water mixing means of the hot water mixing means; and While controlling and adjusting the position of the valve body of the hot water mixing means to set the temperature of the hot water flowing out of the hot water outlet, measure the elapsed time from the stop of hot water to the time of hot water re-starting, and according to the elapsed time, Control means for adjusting the position of the valve element by a predetermined amount based on the set hot water temperature. A water supply pipe is connected to the water introduction side, and a heat exchanger that heats the supply water with heat from a heat source to generate hot water; and a housing having a water inlet, a hot water inlet, and a hot water outlet, A heat expansion / contraction member that expands and contracts by the temperature of the hot water is provided in part, and a valve body whose position is adjusted by a shaft member that moves forward and backward by a driving unit is provided, and the water supply pipe is connected to the water supply pipe to be supplied with water. The hot water inlet receives hot water from the heat exchanger, and the drive means moves the shaft member back and forth to change the position of the valve body between the water side and the hot water side, thereby reducing the mixing ratio between water and hot water. Hot water mixing means that corrects the position of the valve body by expanding and contracting the thermal expansion / contraction member with hot water obtained by mixing and mixing water and hot water, and stabilizing the temperature of the hot water flowing out of the tap hole. And this hot water mixture Remote control means for setting the temperature of the hot water flowing out of the tap hole of the means, and controlling the drive means by means of the temperature set by the remote control means to adjust the position of the valve element of the hot water mixing means so as to adjust the temperature of the hot water from the tap port. Control means for setting the temperature of the hot water to be discharged, measuring the elapsed time from the stop of hot water supply to the time of re-water supply, and adjusting the position of the valve body by a predetermined amount based on the set hot water temperature according to the elapsed time, A hot water temperature control method for a hot water supply apparatus comprising: performing a hot water supply operation at a set hot water temperature, starting timekeeping by stopping operation, and moving the valve of the hot water mixing means to the position of the set hot water temperature. If the operation is adjusted to a position at which the temperature becomes higher by a predetermined temperature and restarting is performed before a predetermined time has elapsed from the stop of the operation, hot water supply is started at the adjustment position of the valve body adjusted at the time of the stop of the operation. From stop When the fixed time has elapsed, the position of the valve body of the hot water mixing means is adjusted so as to be lower by a predetermined temperature than the set temperature at the time of stopping the operation, and at the time of re-operation, the tapping is started at the adjusted position. A method for controlling a hot water temperature of a hot water supply device.