JPH10176863A - Hot water supply device and temperature adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a hot water feeding to be carried out at a bathtub under an application of both heating sections in a high fuel efficiency at an accurate hot water feeding temperature and in a less amount of deposition of scale in a hot water feeding device having a single burner used commonly for heating a heating section for hot water supply and another heating section for bathtub water reheating. SOLUTION: Hot water is fed from a hot water supply heating section 11 to a predetermined location C within a going passage 6 and a returning passage 5 forming a circulating passage between a bathtub 23 and an additional boiling heating section 25, the flow is divided into two systems 50, 51 from the predetermined location C, only one system is passed through the bathtub water reheating heating section 25. There are provided a bathtub temperature calculating means for calculating a bathtub temperature Tc in response to a flow rate ratio R between both systems and hot water temperatures T1, T2 in a supply line 6 and a return line 5, and a control means for controlling the hot water supply temperature T1 at the hot water supply heating section 11 in such a way that the calculated bathtub temperature Tc calculated by the bathtub temperature calculating means and a predetermined set bathtub temperature Ts may be coincided with each other.

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 having a first heat exchange section and a second heat exchange section which are commonly heated by a combustion section comprising a single burner, and more particularly to a bathtub. The control of hot water supply temperature.

[0002]

2. Description of the Related Art Conventionally, as this type of hot water supply device,
A hot water supply heating unit that heats water from a water supply channel with a heat exchanger for hot water supply and supplies the hot water to the hot water channel, and heats hot water from the bathtub on the return path from the bathtub with a heat exchanger for additional heating and circulates on the outward route to the bathtub. Some include a heating unit for additional heating to be supplied and a combustion unit composed of a single burner for heating the heat exchanger for hot water supply and the heat exchanger for additional heating in common. When hot water is supplied to the bath tub using such a hot water supply device, in order to secure as much hot water supply per unit time as possible and to shorten the hot water supply time, in order to shorten the hot water supply time, a two-transport type in which hot water is supplied using both the forward path and the return path. Hot water supply method is mainstream. However, in the two-conveyance type hot water supply method, since a part of the hot water of the hot water supply heating unit which is controlled to discharge hot water of a predetermined temperature is reheated by the additional heating heating unit, There was a potential problem that the hot water supply temperature was higher than the predetermined temperature.

In order to solve this potential problem in the two-conveying type hot water supply method, the hot water supply path of the hot water supply heating section is branched into two circuits, each circuit is provided with a check valve, There was a structure in which each was connected in the middle of the return route and did not pass through the additional heating unit.

[0004]

However, in the above-described hot water supply apparatus which does not pass through the additional heating unit,
Branching the hot water supply path into two circuits, providing a check valve in each circuit,
Because of the complicated structure that separates and separates the heating unit for additional heating at the time of hot water supply in a bathtub, extra circuit parts such as a joint for branching and a check valve are required, causing a rise in manufacturing cost. Further, the hot water staying in the additional heat exchanger is heated and boiled at the same time as the hot water supply heating unit, so that there is a problem that scale is deposited and the performance quality of the product is deteriorated.
Further, the hot water staying in the additional heat exchanger is unnecessarily heated, so that the heat efficiency of the entire hot water supply apparatus is substantially reduced, and the fuel consumption efficiency is poor and uneconomical.

The present invention has been made in view of the above point, and an object of the present invention is to provide a temperature adjusting method capable of supplying hot water at an accurate hot water supply temperature by a two-conveyance type hot water supply method, and
To provide a hot water supply system with a simple structure, low scale deposition and high fuel consumption efficiency, and to achieve higher performance, higher quality, lower cost, and lower running cost compared to conventional hot water supply systems. is there.

[0006]

[Means for Solving the Problems]

[Configuration] A first characteristic configuration of the present invention for achieving this object is to heat water from a water supply channel with a heat exchanger for hot water supply, as described in claim 1 of the claims. A heating unit for supplying hot water to the hot water supply path, a heating unit for additional heating, which heats the hot water from the bathtub on the return path with the additional heat exchanger and circulates it on the outward path to the bathtub, and the heat exchanger for hot water supply And a combustion unit comprising a single burner for commonly heating the reheating heat exchanger and the reheating unit, when the hot water in the hot water supply path is supplied to the bathtub, the hot water is divided into two systems. Sinking, one of the hot water flows out of the outbound path to the bathtub, the other hot water flows out of the return path to the bathtub, and one of the hot water flows in the middle for the reheating heat exchange. A hot water supply channel configured to be reheated via a vessel and to supply hot water to the bathtub; A hot water supply temperature measuring means capable of separately measuring the hot water temperature of the hot water diverted to the two systems of the return path, wherein the hot water supplied from the forward path and the return path to the bathtub is mixed in the bathtub. The bathtub temperature is calculated based on the flow ratio of the hot water diverted into the two systems of the forward route and the return route and the hot water supply temperature of the hot water supplied from the forward route and the return route measured by the hot water temperature measuring means for each flow channel. A bathtub temperature calculating means for supplying hot water from the hot water supply path to the bathtub, so that the calculated bathtub temperature calculated by the bathtub temperature calculating means coincides with a preset setting bathtub temperature. The present invention is characterized in that control means for controlling the hot water supply temperature of the heating unit is provided.

According to a second feature of the present invention, as described in claim 2 of the claims, in addition to the first feature of the present invention, hot water in the bathtub is supplied to at least the outgoing path and the return path. A bathtub temperature measuring means is provided for inviting one side to measure the hot water temperature, and during hot water supply to the bathtub, the hot water divided into two systems of the forward path and the return path measured by the hot water temperature measuring means for each flow path is provided. A flow ratio learning unit that learns the flow ratio based on a hot water supply temperature and a hot water temperature in the bath tub measured by the bath tub temperature measurement unit after the hot water supply, and stores a flow ratio learned by the flow ratio learning unit; The present invention is characterized in that a flow rate ratio storage means is provided, and the bathtub temperature calculation means calculates the bathtub temperature using the flow rate ratio stored in the flow rate storage means.

[0008] According to a third feature of the present invention, as described in claim 3 of the claims, in addition to the above-mentioned first feature, a flow sensor is provided on the outward or return path of the bathtub. The bathtub temperature calculating means includes a flow rate ratio calculating means for calculating the flow rate ratio based on the flow rate from the flow rate sensor.

The fourth feature is that the first heat exchange section and the second heat exchange section which are commonly heated by the combustion section comprising a single burner as described in claim 4 of the claims. The hot water heated by the first heat exchanging unit is divided into two systems by using a hot water supply device provided with a hot water supply unit, and one of the split hot water is directly supplied to a predetermined hot water supply container via the first hot water supply passage. After the other hot water that has been discharged and diverted is reheated in the second heat exchange unit, the hot water is discharged to the hot water supply container through a second hot water supply path, and the hot water diverted to the two systems is supplied to the hot water supply destination. In the temperature adjusting method for mixing and supplying hot water to a container, a target temperature Tm of hot water heated in the first heat exchange unit and supplied to the first hot water supply path and the second heat exchange unit is supplied to the hot water supply container. Temporarily set to a predetermined initial value based on the set temperature Ts of the hot water to be mixed and supplied, and mixed with the hot water supply container. The hot water supply is started, and the temperature T1 of the hot water in the first hot water supply path or supplied to the first hot water supply path is measured, and the temperature of the hot water temperature T1 is set so that the hot water temperature T1 becomes equal to the target temperature Tm. The temperature control step S1 for performing the control is continuously performed during the mixed hot water supply operation. In parallel with the temperature control step S1, the hot water temperature T1 and the hot water temperature T2 of the second hot water supply path are measured. The hot water temperatures T1 and T2 are divided by the flow ratio R of the hot water divided into the two systems, and the hot water temperatures T1 and T2 are divided.
A mixed hot water temperature calculating step S2 for calculating the mixed hot water temperature Tc of No. 2;
The mixed hot water temperature Tc is compared with the set temperature Ts. If the mixed hot water temperature Tc is higher than the set temperature Ts, the target temperature Tm is corrected to be lower, and the mixed hot water temperature Tc is lower than the set temperature Ts. In this case, the point is that the target temperature correction step S3 for correcting the target temperature Tm to be higher is sequentially and repeatedly executed.

The fifth characteristic configuration is, as described in claim 5 in the claims section, in addition to the fourth characteristic configuration, the mixed hot water temperature calculating step S2 and the target temperature correcting step. If the mixed hot water temperature Tc and the set temperature Ts become equal within a predetermined error range during the repeated execution of S3, the target temperature Tm is fixed to the hot water temperature T1 at that time, and the mixed hot water is fixed. The point is that the execution of the temperature calculation step S2 and the target temperature correction step S3 is stopped.

The sixth characteristic configuration is, as described in claim 6 of the claims section, in addition to the fourth or fifth characteristic configuration, before the mixed hot water temperature calculation step S2 is performed. The point is that the flow rate R is calculated by measuring the flow rate of the first hot water supply path or the second hot water supply path.

The seventh aspect of the present invention is directed to a seventh aspect of the present invention, in addition to the fourth or fifth aspect, in which the mixed hot water supply to the hot water supply container is performed in addition to the fourth or fifth aspect. Before the start, the mixed hot water supply to the hot water supply container is started in a state where the flow ratio learning step S4 for learning the flow ratio R of the hot water divided into the two systems is performed at least once in advance. In the temperature calculation step S2, the flow rate ratio R learned in the flow rate ratio learning step S4 is used.

The eighth feature of the present invention is the same as the eighth feature of the present invention, except that, in the flow rate ratio learning step S4, the first heat exchange is performed. The hot water heated in the section is divided into two systems, one of the divided hot water is directly discharged to the hot water supply container via the first hot water supply path at a constant temperature, and the other of the divided hot water is discharged into the second hot water container in the second system. After reheating in the heat exchange section, the mixed hot water supply to the hot water supply container is performed by tapping the hot water supply container through the second hot water supply path, and the water level in the hot water supply container is set to the first hot water supply path and The hot water supply temperature of the first hot water supply path and the second hot water supply path is measured during the mixed hot water supply until the temperature becomes higher than the outlet of the second hot water supply path. Mixing the hot water in the hot water supply container with the first hot water supply path and the second hot water supply path;
The mixed hot water temperature T3 is measured by inviting the mixed hot water to the hot water supply path or both, and the measured hot water temperatures T1, T2 and the mixed hot water temperature T3 are measured.
, The flow ratio R of the hot water diverted into the two systems is calculated, and the learned value or the initial setting value of the flow ratio R is updated.

According to a ninth feature of the present invention, in addition to the eighth feature of the present invention, in the flow rate ratio learning step S4, the mixed hot water temperature T3 Before measuring the hot water in the hot-water supply container,
The point is to circulate through the hot water supply path and the second hot water supply path.

According to a tenth feature of the present invention, as described in claim 10 of the claims, in addition to the eighth or ninth feature of the present invention, in the flow ratio learning step S4,
Before starting the mixed hot water supply, starting a predetermined operation for circulating the hot water in the hot water supply container through the first hot water supply path and the second hot water supply path, and detecting a circulating water flow after the start of the operation; The point is that learning is stopped without updating the flow rate ratio R.

According to an eleventh feature of the present invention, in addition to the eighth, ninth, or tenth feature of the present invention, the flow rate ratio learning step S4 In the above, after the mixed hot water supply is performed for a predetermined total amount of hot water supply and stopped, it is determined whether or not the actual measured water level after the stop of the mixed hot water supply and the set water level corresponding to the predetermined total amount of hot water supply hot water stored in advance match. However, if they do not match, the learning is stopped without updating the flow rate ratio R.

According to a twelfth feature, the flow rate learning step S4 is performed in addition to the eighth, ninth or tenth features described above. In the above, after the mixed hot water supply is performed to a predetermined hot water supply stop water level and stopped, it is determined whether or not the actual hot water supply total amount of the mixed hot water supply matches the hot water supply amount corresponding to the previously stored hot water supply stop water level, and does not match. In this case, the learning is stopped without updating the flow rate ratio R.

According to a thirteenth characteristic configuration, as described in claim 13 of the claims, in addition to the above-described fourth or fifth characteristic configuration, mixed hot water supply to the hot water supply container is performed. After completion, the hot water in the hot water supply container was circulated through the first hot water supply channel and the second hot water supply channel, and the mixed hot water temperature T3 of the mixed hot water in the hot water supply container was measured and measured. The mixed hot water temperature T3 is compared with the mixed hot water temperature Tc or the set temperature Ts obtained in the mixed hot water temperature calculation step S2. As a result of the comparison, the mixed hot water temperature T3 and the mixed hot water temperature Tc or the set temperature Ts are compared. Are different, the mixed hot water temperature calculating step S
The flow rate ratio Rt at which the mixed hot water temperature T3 can be derived from the hot water temperatures T1 and T2 is calculated in the same manner as that for calculating the mixed hot water temperature Tc in Step 2, and used in the mixed hot water temperature calculating step S2. The point is that the flow ratio R is updated with the flow ratio Rt.

[Functions and Effects] The functions and effects of each of the above-described features will be described below. According to the first characteristic configuration, the hot water heated by the hot water supply heating unit and a part thereof is reheated by the additional heating heating unit, and the hot water heated only by the hot water supply heating unit is the 2nd hot water. Since the hot water supply temperature in the bath tub is different from the tapping temperature of the hot water supply heating unit capable of directly controlling the temperature, the hot water supply temperature in the bath tub is increased by the path. The temperature of hot water supplied from the two paths and mixed in the bathtub from the hot water supply temperature of the hot water supplied from the forward path and the return path measured by the temperature measuring means and the flow rate ratio of the hot water supplied from the forward path and the return path. Is calculated, and the control means controls the tapping temperature of the heating unit for hot water supply so that the calculated calculated bathtub temperature matches the preset bathtub temperature, thereby finally supplying the bathtub to the bathtub. The temperature of the hot water is set to the bathtub temperature Than it can be equal to. The tapping temperature control of the heating unit for hot water supply includes, for example, adjustment of a mixing ratio of hot water heated by the heating unit for hot water supply and water before heating, adjustment of a combustion amount of the combustion unit, and control of the hot water supply. It is possible by adjusting the amount of water supplied to the heating unit or by combining these.

In addition, since both the forward path and the return path provided for circulating hot water between the bathtub and the additional heating unit for reheating are used, hot water can be supplied to the bathtub in a short time. It is.

Further, since the hot water is supplied by using the additional heat exchanger which is heated simultaneously with the hot water exchanger by the common combustion section, the heat efficiency can be improved and the additional heat exchange can be performed. Hot water can be prevented from staying in the vessel, and scale precipitation can be suppressed.

As a result, higher performance, higher quality, lower cost, and lower running cost can be achieved as compared with the conventional hot water supply apparatus.

According to the second characteristic configuration, at the time of hot water supply to the bathtub with learning of the flow rate ratio or learning of the flow rate ratio, the hot water supply temperature measuring means for each flow path measures the forward path and the return path. The hot water temperature of the hot water diverted into the two systems is measured, the hot water supply is stopped after supplying a predetermined hot water supply amount, and the hot water in the bath tub is led to at least one of the outward route and the return route by the bath temperature measuring means. The hot water temperature is measured, and the flow rate ratio can be learned based on the hot water supply temperature of the hot water diverted to the two systems of the outward route and the homeward route and the hot water temperature in the bathtub. Specifically, if the hot water supply temperatures of the forward path and the return path are divided by the flow rate ratio, the bathtub temperature is determined, and if each temperature is determined, the flow rate ratio is obtained by back calculation, and the obtained flow rate is obtained. The flow ratio can be learned by updating the existing value with the ratio. In addition, it seems that the problem of the prior art is solved by providing a water thermometer as the bathtub temperature measuring means in the bathtub. However, providing the water thermometer in the bathtub itself as described above reduces the manufacturing cost of the bathtub itself. It will greatly increase. Also, it should be noted that the hot tub in the bath tub cannot be drawn to the outgoing path or the return path during the mixed hot water supply, so that the bath tub temperature measuring means and the hot water temperature measuring means for each flow path cannot measure the bath tub temperature.

Further, at the time of normal bath water supply without learning of the flow ratio, the flow ratio learned by the flow ratio learning means is read from the flow ratio storage means, and the bath tub temperature calculating means is based on the flow ratio. The bath temperature can be calculated. That is, since it is not necessary to calculate the flow rate every time the hot water is supplied to the bathtub, the procedure for calculating the bathtub temperature and the control procedure for controlling the hot water supply temperature of the hot water supply heating unit based thereon can be simplified.

Generally, the flow ratio of the hot water diverted to the two systems, the outgoing route and the return route, is determined by the variation in the size of each component of the hot water supply device, the length of the pipe from the hot water supply device to the bathtub, and the like. The value varies depending on the installation state and the variation of the original water pressure of the water supply pipe, and is not determined in advance when the water heater main body is manufactured. However, the device variation and the piping and installation state are constant after the piping and installation, and the fluctuation of the original water pressure is not a frequent fluctuation but a seasonal gradual fluctuation. Therefore, after the installation, the flow ratio learning needs to be performed at least once before the start, and the periodic learning is preferably performed several times a year. From this, according to the second characteristic configuration, long-term fluctuations in the original water pressure due to changes in the season and surrounding environment can be accurately reflected in fluctuations in the flow rate ratio, and accurate hot water supply temperature adjustment can be performed. is there.

Further, the flow rate ratio can be directly obtained by using a flow rate sensor as in a third feature configuration described later, but according to the second feature configuration, a separate flow rate sensor is required. Since there is no need to provide them, cost reduction can be achieved.

According to the third characteristic configuration, the flow rate ratio can be directly calculated based on the flow rate from the flow rate sensor, so that the accuracy of the flow rate ratio can be improved. This is particularly effective when the original water pressure frequently fluctuates.

According to the fourth characteristic configuration, in the mixed hot water supply to the hot water supply container, the temperature control step S1 targets only the first hot water supply path of the first hot water supply path and the second hot water supply path. By performing the temperature control as described above, the temperature of the mixed hot water can be accurately adjusted to the set temperature. Here, in the temperature control step S1, by limiting the control target to only the first hot water supply path, the control procedure can be simplified and stable control can be obtained.

When only one of the first hot water supply path and the second hot water supply path is used, the hot water supply temperature T1 or T2 can be measured directly, and the hot water supply temperature to the hot water supply container can be accurately set to the set temperature. However, according to this characteristic configuration, accurate hot water supply temperature adjustment can be performed, and at the same time, both the first hot water supply path and the second hot water supply path are used. Thus, the mixed hot water supply to the hot water supply container can be completed in a short time.

Further, when the first heat exchange section is heated and supplied by the common combustion section, the second heat exchange section is also heated and supplied at the same time, so that the thermal efficiency can be improved and the second heat exchange section can be provided. Hot water can be prevented from staying in the exchange section, and scale precipitation can be suppressed.

According to the fifth characteristic configuration, once the mixed hot water supply operation to the hot water supply container reaches a steady state, the target temperature Tm is fixed at a constant value.
1, even if the measured value of T2 is disturbed by disturbance or the like, the temperature control step S1 can perform stable temperature control. Further, since it is not necessary to continue the measurement of the hot water temperature T2, the mixed hot water temperature calculating step S2, and the target temperature correcting step S3, power saving can be achieved.

According to the sixth characteristic configuration, the flow rate of the first hot water supply passage or the second hot water supply passage, and the amount of water supply or discharge of the first heat exchange unit used for controlling the combustion of the first heat exchange unit. The flow rate ratio R can be obtained by calculation from the amount of hot water.
Since the flow rate ratio R obtained by the calculation can obtain an extremely accurate flow rate ratio R that accurately reflects the situation of the original water pressure at the time of actual hot water supply, even in a situation where the original water pressure frequently fluctuates. Therefore, the temperature of hot water supplied to the hot water supply container can be accurately adjusted to the set temperature.

[0033] According to the seventh characteristic configuration, the long-term original water pressure due to the variation of the apparatus, the piping and the installation state, and the season and the change of the surrounding environment as described in the section of the operation of the second characteristic configuration. By learning in advance the flow ratio that accurately reflects the fluctuations of the hot water supply device, when the hot water supply device is actually used for mixed hot water supply to the hot water supply container, an accurate flow rate ratio can be used, and the hot water supply The hot water supply temperature can be accurately adjusted to the set temperature. Further, once the accurate flow rate ratio is learned, it is not necessary to determine the flow rate every time the mixed hot water supply operation to the hot water supply container is performed, unless the flow rate ratio fluctuates due to a change in the season or the surrounding environment. Thus, the control procedure can be simplified.

According to the eighth characteristic configuration, the mixed hot water supply to the hot water supply container is performed by changing the water level in the hot water supply container higher than the outlets of the first hot water supply passage and the second hot water supply passage. After the mixed hot water supply is stopped, the mixed hot water in the hot water supply container is drawn into the first hot water supply path, the second hot water supply path, or both, and the mixed hot water temperature can be measured.
Furthermore, if the hot water supply temperatures of the first hot water supply passage and the second hot water supply passage are divided by the flow rate ratio, the mixed hot water temperature is obtained, so that the hot water supply temperatures of the first hot water supply passage and the second hot water supply passage, When the temperature of the mixed hot water in the hot water supply container is obtained, the flow rate ratio can be calculated backward by a simple calculation, and the flow rate ratio can be learned by updating the existing value with the obtained flow rate ratio.

According to the ninth characteristic configuration, the hot water in the hot water supply container is circulated through the first hot water supply passage and the second hot water supply passage, so that mixing of the hot water in the hot water supply container is promoted. In addition, the temperature of the mixed hot water can be accurately measured in a short time.

According to the tenth characteristic configuration, it is possible to prevent the learning of the flow rate ratio from becoming inaccurate due to the effect of hot water or water remaining in the hot water supply container at the start of the flow ratio learning step. .

According to the eleventh or twelfth feature,
At the start of the flow rate ratio learning step, it can be determined that hot water or water remains in the hot water supply container, and learning of the flow rate ratio can be prevented from becoming inaccurate.

According to the thirteenth characteristic configuration, even if the flow ratio fluctuates more frequently than seasonal fluctuations or the like, the flow ratio can be learned each time a fluctuation occurs, and After fluctuating, it is possible to prevent an incorrect flow ratio from being used for a long time.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hot water supply apparatus according to the present invention (hereinafter referred to as the apparatus of the present invention) will be described below with reference to the drawings.

First, the system configuration of the bath water supply system using the apparatus of the present invention, such as the connection relationship between various pipes and devices, will be described. As shown in FIG. 1, the apparatus of the present invention includes a hot water supply heating unit 11 in which water supplied from a water supply passage 1 is heated by a hot water supply heat exchanger 10 and discharged through the hot water supply passage 2. The unit 11 is configured such that the hot water supply heat exchanger 10 is heated by the combustion of a single burner 12, and the combustion of the burner 12 is performed by fuel supply from the gas supply passage 9 and a combustion fan (not shown). When the combustion control means 40 receives the supply of combustion air from the fuel supply device, it appropriately executes the fuel supply and the supply of combustion air. The gas supply path 9 is provided with a gas switching solenoid valve 13, a gas flow regulating valve 14, and a source gas solenoid valve 15. The gas supply path 9 branches into three systems, and the gas switching electromagnetic valve 13 is provided for each of the branched gas supply paths 9 and connected to the burner 12 to form a multi-stage burner.

The water supply passage 1 is provided with a check valve 16, a water amount sensor 17 for measuring a water supply amount, and a water supply thermistor 18 for measuring a water supply temperature. Further, the water supply channel 1 branches at a branch point A on the downstream side of the water amount sensor 17, and the water supply bypass passage 3 is connected to the branch point A. The hot water supply path 2 is connected to the water supply bypass path 3, mixes water from the water supply bypass path 3 with hot water from the hot water supply heat exchanger 10, and discharges water downstream of the hot water supply path 2. A mixing valve 19 is provided. Further, a hot water supply thermistor 20 is provided on the upstream side of the mixing valve 19 of the hot water supply path 2, and a water proportional valve 21 and a hot water supply thermistor 22 are provided on the downstream side thereof. The hot water supply path 2 is branched into two systems at a branch point B on the downstream side of the hot water supply thermistor 20, one of which forms a bathtub hot water supply path 4 for supplying hot water to the bathtub 23.

Further, a remote control operating unit 3 for giving an instruction such as a set hot water supply temperature to the combustion control means 40 and displaying information on a combustion state from the combustion control means 40.
8 is provided separately from the device of the present invention. The combustion control means 40 performs the hot water supply on the basis of a set hot water supply temperature set based on each measurement information from the water amount sensor 17, the water supply thermistor 18, and the hot water supply thermistor 20 and information from the remote control operation unit 38. The required combustion amount of the heating unit 11 is set by calculation, the fuel supply amount and the supply amount of combustion air are set based on the set combustion amount, and the rotation speed of the combustion fan is controlled.

The hot water in the bath tub 23 supplied from the return path 5 of the bath tub 23 is heated by the additional heat exchanger 24, and the hot water is supplied to the bath tub 23 from the outward path 6 of the bath tub 23. The additional heat exchanger 24 is located above the hot water supply heat exchanger 10 and is provided so as to be heated by the burner 12 at the same time as the hot water supply heat exchanger 10. One end of each of the return path 5 and the outward path 6 is connected to an opening 26 provided on the inner wall surface of the bathtub 23.

The bathtub hot water supply path 4 is connected to the outgoing path 6 at a branch point C via a bathtub hot water supply valve 27, a backflow hopper 28, and a check valve 29, and from the branch point C, the reheating heat exchanger. 2
The four-way outgoing path 6 is provided with a three-way valve 30 and an outgoing-path thermistor 31 (a part of the hot water supply temperature measuring means for each flow path) for detecting the temperature of the hot water in the outgoing path 6. The return path 5 includes a return path thermistor 32 (a part of a hot water supply temperature measuring means for each flow path) for detecting a hot water temperature in the return path 5, a water level sensor 33 for detecting a water level in the bathtub 23, a two-way valve 34, A circulating pump 35 whose main purpose is to circulate the hot water in the bathtub 23 between the bathtub 23 and the additional heating unit 25 for additional heating, a water flow switch 36 for detecting that a set amount or more of hot and cold water flows, and the like. Are provided in this order from the bathtub 23 side.

Further, one end of the three-way valve 30 is provided at an intermediate point D between the two-way valve 34 and the circulation pump 35 in the return path 5.
Through the circulation short-circuit path 7, and furthermore, the intermediate point D
And the backflow hopper 28 are connected via the drain bypass passage 8, and a drain valve 37 is provided in the middle thereof. When there is no hot water in the bathtub 23 and the hot water supply heating unit 11 is used for general hot water supply other than bathtub hot water supply, the three-way valve 3
0 forms a short-circuit path via the circulation short-circuit path 7 for forcibly circulating the hot water of the reheating heater 25 without passing through the bathtub 23, and the reheating heat exchanger. The quality deterioration such as the deposition of scale in the inside 24 is prevented.

Hereinafter, using the apparatus of the present invention shown in FIG.
The operation of each part when hot water is supplied to the bathtub 23 will be described.

First, the bathing switch 38a of the remote control operation unit 38 is pressed to set the bathtub 23 in the bathing mode. It should be noted that the hot water filling mode is confirmed by lighting of a pilot lamp or the like. The combustion control means 40
When a bathtub hot water supply start command is received from the remote control operation unit 38, the combustion fan is rotated, the gas switching solenoid valve 13 and the original gas solenoid valve 15 are opened, and the gas flow control valve 14 A predetermined amount of fuel gas at the time of ignition set is supplied to the burner 12, and the burner 12 is ignited. Further, simultaneously with the operation of igniting the burner 12, the water proportional valve 21, the bathtub hot water valve 2
7, the two-way valve 34 and the three-way valve 30 are opened on the outward path 6 side flow path, and the drain valve 37 and the three-way valve 30 are closed on the circulation short circuit path 7 side flow path; A hot water supply path from the hot water supply branch 6 to the bathtub 23 via the branch point C and the forward path 6 (indicated by thick and solid arrows in FIG. 1).
Are formed from the branch point C into two systems, a first hot water supply path 50 that does not pass through the additional heating unit 25 and a second hot water supply path 51 that passes through, and is heated by the hot water supply heating unit 11. Hot water is supplied to the bathtub 23.

Hereinafter, a control method of each part in the case where the hot water supply channel branches into two systems and performs mixed hot water supply as described above will be described.

First, during the mixed hot water supply operation, the control means provided in parallel with the combustion control means 40 continuously executes the temperature control step S1. Specifically, the hot water temperature T of the first hot water supply path 50
1 is measured by the tap water thermistor 22 or the outgoing path thermistor 31, the feed water temperature measured by the feed water thermistor 18 and the hot water temperature immediately after tapping from the hot water supply heat exchanger 10 measured by the hot water feed thermistor 20. Based on the mixing ratio of the mixing valve 19, that is, the water from the water supply bypass passage 3 and the hot water supply heat exchanger 1
The mixing ratio of the hot water to be discharged from 0 is adjusted so that the temperature of the hot water (substantially equal to the hot water temperature T1) to the bathtub hot water supply path 4 becomes the target temperature Tm.
Is controlled to match.

The hot water in the second hot water supply path 51 is reheated by the additional heating unit 25, and the hot water in the first hot water supply path 50 (hot water temperature T
1) Since the temperature becomes higher, the mixed hot water temperature Tc of the hot water supplied from the first hot water supply passage 50 and the second hot water supply passage 51 and mixed in the bathtub 23 is, as shown in Expression 1, the first hot water supply Road 5
The hot water temperature T1 of 0 and the hot water temperature T2 of the second hot water supply path 51 are intermediate values obtained by dividing the respective flow rates by the flow ratio R. Therefore, assuming that the set temperature Ts of hot water mixed and supplied to the bathtub 23 set by the remote control operation unit 38 is simply the target temperature Tm, the mixed hot water temperature Tc is always higher than the set temperature Ts. I will. The flow ratio R is a ratio of the flow rate of the first hot water supply path 50 to the total flow rate of the bathtub hot water supply path 4.

[0051]

Tc = T1 × R + T2 × (1-R)

The mixed hot water temperature Tc is determined by the first hot water supply path 50.
Since the second hot water supply path 51 supplies hot water at different temperatures, the outgoing thermistor 31 or the return thermistor 32 cannot directly measure the hot water, so the bath tub temperature calculating means provided in parallel with the combustion control means 40 Using,
In parallel with the temperature control step S1, the mixed hot water temperature calculation step S
2 is performed, and the mixed hot water temperature Tc is obtained by calculation.
Specifically, the hot water temperature T1 is measured by the tapping thermistor 22 or the outgoing thermistor 31, and the hot water temperature T2 is measured by the return thermistor 32, and together with the flow rate R preset by learning as described later, The mixed hot water temperature Tc is obtained by substituting into the equation (1).

Subsequently, the control means executes a target temperature correction step S3 for properly adjusting the target temperature Tm in the temperature control step S1. More specifically, as shown in the flowchart of FIG. 2, a comparison is made between the mixed hot water temperature Tc calculated in the mixed hot water temperature calculating step S2 and the set temperature Ts. When the mixed hot water temperature Tc is higher than the set temperature Ts, the target temperature Tm is corrected to be lower, and when the mixed hot water temperature Tc is lower than the set temperature Ts, the target temperature Tm is corrected to be higher. The temperature control step S1 is executed while the corrected target temperature Tm is always reflected in the temperature control step S1, and in parallel, the mixed hot water temperature calculation step S2 and the target temperature correction step S3 are performed in the mixing step. The process is repeatedly performed until the hot water temperature Tc and the set temperature Ts become equal within a predetermined error range, and when the mixed hot water temperature Tc and the set temperature Ts become equal within the predetermined error range, the target temperature Tm is changed. At this time, the hot water temperature T1 is fixed, and the execution of the mixed hot water temperature calculating step S2 and the target temperature correcting step S3 are stopped. The temperature control step S1 is continued until the water level sensor 33 detects that a predetermined amount of hot water has been supplied to the bathtub 23, and the mixed hot water supply operation is stopped.

The procedure for learning the flow ratio R will be described below.
The flow ratio learning means arranged in parallel with the combustion control means 40 starts the flow ratio learning step S4. The circulating pump 35 performs an initial check whether hot water remains in the bathtub 23.
Is started, and the water flow switch 36 is used. at this point,
When the water flow switch 36 detects a water flow, the bathtub 2
It is determined that hot and cold water has remained in 3 and even if learning is continued in this state, an accurate flow ratio R cannot be obtained, so the flow ratio learning step S4 is stopped.

If there is no problem in the initial check, the flow ratio learning means starts the mixed hot water supply operation for learning the flow ratio in the same manner as the normal mixed hot water supply in cooperation with the combustion control means 40 and the control means 41. . The first hot water supply path 50 is fixed with a target hot water supply temperature Tm to the bath water supply path 4 fixed at a constant value.
And the respective hot water supply temperatures T1 and T2 of the second hot water supply passage 51 are mixed and supplied. Also, during the mixed hot water supply, each hot water supply temperature T
1. The measurement of T2 is performed simultaneously.

By the flow rate ratio learning means, the water amount sensor 17 executes while integrating the hot water supply amount, and a preset bath water supply necessary for the hot water level L to be higher than the opening 26 of the bath tub 23. Control is performed so that the mixed hot water supply operation is stopped when the amount Q is reached. The water level sensor 3
3 hot water supply water level L during mixing hot water supply operation is stopped is measured, and the water level L _Q corresponding to the bathtub hot-water supply amount Q to compares wallpapers hot water level. If the measured water level L and the set water level _LQ are not equal, there is a high possibility that hot water has remained in the bathtub 23, and even if learning is continued in this state, an accurate flow rate ratio R cannot be obtained. The flow ratio learning means stops learning.

[0057] When measuring the water level L and the set water level L _Q are equal, the flow rate ratio learning means prohibits the general hot water supply of the hot water supply heat unit 11, the add焚用heating unit 25 is not inadvertently heated In this state, the circulation pump 35 is started, and the hot water in the bathtub 23 is circulated in the return path 5 and the forward path 6 (indicated by a broken arrow in FIG. 1), and the forward path thermistor 31 and the return path thermistor 32 In at least one of the cases, the mixed hot water temperature T3 of the bathtub 23 is measured until it reaches a steady value, and the circulation pump 35 is stopped.

Subsequently, the flow ratio learning means calculates the flow ratio R by substituting the measured hot water temperatures T1 and T2 and the mixed hot water temperature T3 into the following equation (2). Equation 2 is the Tc of Equation 1.
Is replaced by T3, and is transformed and derived.

[0059]

R = (T3-T1) Ｔ (T2-T1)

The flow ratio learning means calculates the learned value or the initial set value stored in the flow ratio storage means provided in the flow ratio learning means with the flow ratio R obtained by calculating equation (2). Overwriting is performed to update the flow ratio R, and the learning of the flow ratio R ends.

(Another Embodiment) Another embodiment will be described below.

(1) The hot water supply apparatus according to the present invention is not limited to the system configuration shown in FIG. The burner 12 is single in the sense that it always heats the hot water supply heat exchanger 10 and the additional heating heat exchanger 24 at the same time. 2
As long as it is not possible to individually and independently heat, a plurality of 4 may be provided. The water supply bypass 3 and the mixing valve 19 need not always be provided.
Adjustment of the hot water supply temperature of the hot water supply passage 2 when the water supply bypass passage 3 and the mixing valve 19 are not provided can be achieved by adjusting the combustion amount of the burner 12 or the water supply amount from the water supply passage 1. The bathtub hot water supply path 4 may be connected to the return path 5 instead of connecting to the outward path 6 at the branch point C on the downstream side where the check valve 29 is provided. In this case, the flow direction in the additional heating unit 25 during mixed hot water supply is reversed from that in the above embodiment.

(2) In the flow rate ratio learning step S4, it is not always necessary to execute the initial check of the residual water or the check of the hot water level. In that case, the operator may visually check the residual water. The hot water in the water level checking, after the hot water supply predetermined bathtub hot-water supply amount Q and the measured water level L of the set water level L _Q instead of magnitude compared to hot water up to the set water level L _Q, the actual cumulative hot water supply amount and the set water level at that time It is also a preferred embodiment to compare the hot water supply amount Q corresponding to L _Q in magnitude. In the flow rate ratio learning step S4,
Instead of updating the flow ratio R by overwriting the learned value or the initial set value stored in the flow ratio storage unit provided in the flow ratio learning unit with the flow ratio R newly obtained by calculation. It is also a preferred embodiment that the flow ratio R for each learning is separately stored in the flow ratio storage means so as to conduct a trend investigation on the seasonal variation of the flow ratio R. Preferably, the flow ratio storage means is a non-volatile storage device that does not lose stored data at the time of a power failure or the like.

(3) In the above embodiment, after the normal mixed hot water supply to the bathtub 23 is completed, the flow rate ratio learning means inhibits the general hot water supply of the hot water supply heating unit 11 and releases the additional hot water. In a state in which the heating unit 25 is not inadvertently heated, the circulation pump 35 is started to circulate the hot water in the bathtub 23 in the return path 5 and the forward path 6, and to control the forward path thermistor 31 and the return path thermistor 32. At least on one side, the mixed hot water temperature T3 of the bathtub 23 is measured until it reaches a steady value, and the set temperature Ts during the normal mixed hot water supply operation or the target temperature Tm obtained in the mixed hot water temperature calculating step S2.
(The two should be the same) and the measured mixed hot water temperature T3, and if they are different, it is determined that the flow rate ratio R used in the mixed hot water temperature calculation step S2 is incorrect, and the flow rate ratio R
Is also a preferred embodiment. In this case, similarly to the normal flow rate ratio learning step S4, the flow rate ratio learning means uses the final hot water temperatures T1, T2 used in the normal mixed hot water supply operation in the mixed hot water temperature calculation step S2 and the measured mixed hot water. The flow rate ratio R is calculated by substituting the temperature T3 into Equation 2.

(4) In the above embodiment, instead of providing the flow ratio learning means and learning the flow ratio R, a flow sensor is provided in the forward path 6 or the return path 5 of the bathtub 23, and the bathtub temperature is measured. It is also a preferred embodiment that the calculation means calculates the flow rate ratio R based on the flow rate from the flow rate sensor and the total hot water supply amount measured by the water flow rate sensor 17 provided in the water supply passage 1.

(5) The combustion control means 40, the control means, the bathtub temperature calculating means, the flow ratio learning means, and the flow ratio storage means are all constituted by a single microcomputer and a storage device. Software control, a dedicated processor or hardware, or a combination thereof.

[0067]

As described above, according to the present invention,
It has become possible to provide a hot water supply apparatus that can supply hot water at an accurate hot water supply temperature by a dual-conveyance type hot water supply method, has a simple structure, has little scale deposition, and has high fuel consumption efficiency, and a temperature adjustment method therefor.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a hot water supply apparatus according to the present invention.

FIG. 2 is a flowchart illustrating an embodiment of a temperature adjusting method according to the present invention.

FIG. 3 is a flowchart showing one embodiment of a flow ratio learning procedure of the temperature adjustment method according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water supply path 2 hot water supply path 4, 50, 51 hot water supply water supply path 5 return path 6 forward path 10 hot water supply heat exchanger 11 hot water supply heating unit 12 burner 23 bathtub 24 additional heating heat exchanger 25 additional heating heating unit 31, 32 Hot water supply temperature measuring means for each channel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Enomoto, 1-15-1 Oka, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Inside Herman Co., Ltd. (72) Mitsuru Tanaka 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka No. Harman Co., Ltd. (72) Inventor Hirosao Iida 1-152 Oka, Minami-ku, Minato-ku, Osaka-shi, Osaka No. 72 Inventor Noriyo Nakanishi 1-1-52 Oka, Minami-shi, Minato-ku, Osaka, Osaka No. Herman Co., Ltd. (72) Inventor Masayoshi Hokawa 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka

Claims (13)

[Claims] 1. A hot water supply heating unit for heating water from a water supply channel with a hot water supply heat exchanger and supplying the same to the hot water supply channel, and heating the hot water from the bathtub on the return path from the bathtub with a supplementary heat exchanger. A hot water supply device comprising: a reheating heater for circulating and supplying a recirculating heat to the outward path to the hot water supply; and a combustion unit including a single burner for heating the heat exchanger for hot water supply and the heat exchanger for reheating in common. When the hot water in the hot water supply path is supplied to the bathtub,
One of the hot water flows out of the outgoing path to the bathtub, the other hot water flows out of the return path to the bathtub, and the hot water of one of the systems is reheated halfway. A hot water supply channel configured to be reheated via the heat exchanger for hot water and discharged to the bathtub;
Flow path hot water temperature measuring means capable of separately measuring hot water temperature of hot water diverted to the system, wherein the hot tub supplied from the forward pass and the return pass to the bath tub is mixed in the bath tub as a hot tub temperature. Bathtub temperature calculation based on the flow ratio of the hot water diverted to the two systems of the forward path and the return path and the hot water supply temperature of the hot water supplied from the forward path and the return path measured by the hot water supply temperature measuring means for each flow path Means for supplying hot water from the hot water supply path to the bathtub, so that the calculated bathtub temperature calculated by the bathtub temperature calculating means matches a preset bathtub temperature, A hot water supply device having control means for controlling hot water temperature. 2. A bath tub temperature measuring means for inviting hot water in the bath tub to at least one of the outward route and the return route and measuring the hot water temperature, wherein the hot water supply temperature for each flow path is supplied during hot water supply to the bath tub. 2 of the forward path and the return path measured by the measuring means
A flow rate learning unit that learns the flow ratio based on a hot water supply temperature of the hot water diverted into the system and a hot water temperature in the bath tub measured by the bath tub temperature measurement unit after the hot water supply; The flow rate ratio storage means for storing the flow rate ratio obtained, wherein the bathtub temperature calculating means calculates the bathtub temperature using the flow rate ratio stored in the flow rate storage means. Water heater. 3. The bathtub is provided with a flow rate sensor on the outward path or the return path, and the bathtub temperature calculating means includes a flow rate ratio calculating means for calculating the flow rate ratio based on a flow rate from the flow rate sensor. The hot water supply device as described. 4. A hot water supply apparatus comprising a first heat exchange section and a second heat exchange section which are heated in common by a combustion section comprising a single burner, and heated by the first heat exchange section. After splitting the hot water into two systems, directing one of the split hot water to a predetermined hot-water supply container via the first hot water supply path, and reheating the other split hot water in the second heat exchange unit A temperature adjusting method in a method in which hot water is supplied to the hot-water supply container via a second hot-water supply path, and the hot water diverted to the two systems is mixed and supplied to the hot-water supply container; The target temperature Tm of the hot water that is heated and supplied to the first hot water supply passage and the second heat exchange unit is provisionally set to a predetermined initial value based on the set temperature Ts of the hot water mixed and supplied to the hot water supply container. Then, the mixed hot water supply to the hot water supply container is started, and the hot water is supplied to the first hot water supply path or the first hot water supply path. Measuring the temperature T1 of the hot water to be, the hot water temperature T1 is the target temperature Tm
The temperature control step S1 for controlling the temperature of the hot water temperature T1 is continuously performed during the mixed hot water supply operation so as to be equal to the temperature T1 and the second hot water supply in parallel with the temperature control step S1. The temperature T2 of the hot water in the road is measured, and the two hot water temperatures T1 and T2 are divided by the flow rate ratio R of the hot water divided into the two systems, and the mixed hot water temperature T1 of the hot water temperatures T1 and T2 is measured.
a mixed hot water temperature calculating step S2 for calculating c; comparing the mixed hot water temperature Tc with the set temperature Ts; if the mixed hot water temperature Tc is higher than the set temperature Ts, the target temperature Tm is corrected to be lower; When the mixed hot water temperature Tc is lower than the set temperature Ts, a target temperature correcting step S3 for correcting the target temperature Tm to be higher is sequentially and repeatedly executed. 5. When the mixed hot water temperature Tc and the set temperature Ts become equal within a predetermined error range during the repeated execution of the mixed hot water temperature calculating step S2 and the target temperature correcting step S3, The target temperature Tm is set to the hot water temperature T1 at that time.
5. The temperature adjusting method according to claim 4, wherein the mixed hot water temperature calculating step S2 and the target temperature correcting step S3 are stopped. 6. Before executing the mixed hot water temperature calculating step S2,
The flow rate R is calculated by measuring a flow rate of the first hot water supply path or the second hot water supply path.
Or the temperature adjustment method according to 5. 7. Before starting the mixed hot water supply to the hot water supply container, in a state where a flow ratio learning step S4 for learning a flow ratio R of the hot water divided into the two systems is performed at least once in advance, Start mixed hot water supply to the hot water supply container,
6. The temperature adjustment method according to claim 4, wherein the flow rate ratio R learned in the flow rate ratio learning step S4 is used in the mixed hot water temperature calculation step S2. 8. In the flow ratio learning step S4, the hot water heated by the first heat exchange unit is divided into two systems, and one of the divided hot water is supplied to the hot water supply container at a constant temperature. The hot water is directly discharged through a passage, and the other split hot water is reheated in the second heat exchange unit.
Continuing the mixed hot water supply to the hot water supply container by performing hot water supply through the hot water supply path until the water level in the hot water supply container becomes higher than the taps of the first hot water supply path and the second hot water supply path; During the mixed hot water supply, the hot water supply temperatures T1 and T2 of the first hot water supply passage and the second hot water supply passage are measured, and after the mixed hot water supply is stopped, the mixed hot water in the hot water supply container is discharged into the first hot water supply passage. The mixed hot water temperature T3 is measured by inviting the mixed hot water to the second hot water supply channel or both, and based on the measured hot water temperatures T1, T2 and the mixed hot water temperature T3, the flow rate of the hot water diverted to the two systems. The temperature adjustment method according to claim 7, wherein the ratio R is calculated, and a learned value or an initial setting value of the flow ratio R is updated. 9. In the flow ratio learning step S4, circulating hot water in the hot water supply container through the first hot water supply passage and the second hot water supply passage before measuring the mixed hot water temperature T3. The temperature adjustment method according to claim 8, wherein: 10. In the flow rate ratio learning step S4, before the mixed hot water supply is started, the hot water in the hot water supply container is discharged to the first hot water supply container.
A predetermined operation for circulating through the hot water supply path and the second hot water supply path is started, and when a circulating water flow is detected after the start of the operation, learning is stopped without updating the flow rate ratio R. The temperature adjustment method according to claim 8. 11. In the flow rate ratio learning step S4, after the mixed hot water supply is performed for a predetermined total hot water supply amount and stopped, the actual measured water level after the stop of the mixed hot water supply corresponds to the predetermined total hot water supply amount stored in advance. 11. The temperature adjustment method according to claim 8, wherein it is determined whether or not the set water levels to be set match, and if not, learning is stopped without updating the flow rate ratio R. 12. In the flow rate ratio learning step S4, after the mixed hot water supply is performed to a predetermined hot water supply stop water level and stopped, the actual hot water supply amount of the mixed hot water and the hot water supply amount corresponding to the hot water supply stop water level stored in advance. It is determined whether or not the values match, and if they do not match, the learning is stopped without updating the flow ratio R.
The temperature adjustment method described. 13. After the mixed hot water supply to the hot water supply container is completed, the hot water in the hot water supply container is circulated through the first hot water supply path and the second hot water supply path to mix the hot water in the hot water supply container. The mixed hot water temperature T3 of the measured hot water was measured, and the measured mixed hot water temperature T3 was compared with the mixed hot water temperature Tc or the set temperature Ts obtained in the mixed hot water temperature calculating step S2. If the hot water temperature T3 is different from the mixed hot water temperature Tc or the set temperature Ts, the mixed hot water temperature calculating step S2
In the same manner as calculating the mixed hot water temperature Tc, a flow ratio Rt capable of deriving the mixed hot water temperature T3 from the hot water temperatures T1 and T2 is calculated, and the flow rate ratio Rt used in the mixed hot water temperature calculating step S2 is calculated. The temperature adjustment method according to claim 4, wherein the flow ratio R is updated with the flow ratio Rt.