JP2006112752A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent discharge of bathing water of a temperature making a bathing person feel uncomfortable from an additional heating secondary circuit to a bathtub in a water heater comprising a main circulating circuit including a water heating part and a circulating pump; an additional heating primary circuit connected in parallel to a part of the main circulating circuit and including a heating part of an additional heating heat exchanger and an additional heating valve; and the additional heating secondary circuit circulating water between a heat absorption part of the additional heating heat exchanger and the bathtub and including an additional heating pump, in which a heating radiator releasing the heat of hot water circulated in the main circulating circuit is connected to the main circulating circuit, and the water heating part, the circulating pump and the additional heating pump are operated in additional heating of the bathtub. <P>SOLUTION: The additional heating valve 16 is a flow control valve which is kept substantially in a closed state during stoppage of additional heating and set to a predetermined opening during additional heating. The bathing water in the additional heating secondary circuit carried in the heat absorption part of the additional heating heat exchanger is additionally heated by controlling the opening of the additional heating valve 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water supply apparatus having a function of exchanging heat by circulating heat of hot water circulating in a circulation circuit for hot water heating and bath water flowing in the circulation circuit of a bathtub (51).

As this type of hot water supply apparatus, there is one having a schematic configuration shown in FIG.
The main circulation circuit (10) formed in the appliance main body (1) is composed of a main heat exchanger (12) constituting the water heating unit (19) → a throttle area (23) → a systern (14) → a circulation pump (15 ) And circulate.
In the main circulation circuit (10), the downstream side of the main heat exchanger (12) and the cistern (14) are used for the purpose of exchanging heat with the bath water in the bathtub (51) to track it. Connected by primary circuit (C). The primary circuit for remedy (C) is provided with an open / close valve type remedy valve (16) and a heat exchanger for remedy (13), and the heat absorption part of the remedy heat exchanger (13). A remedy pump (53) is inserted into the remedy secondary circuit (5) circulating between the tub and the bathtub (51).
In addition, a heat dissipating mat (31) used for floor heating is inserted in the first heating circuit (3) branched from the discharge side of the circulation pump (15). The downstream circuit is connected to the cistern (14). Further, both ends of the throttle region (23) in the main circulation circuit (10) are connected by the second heating circulation circuit (2). A fan convector (21) is connected to a hot water outlet (29) provided in the second heating circulation circuit (2) and disposed on the wall surface of the room as required.

In this case, when a reheating switch (not shown) is turned on, the gas burner (11) burns, the retreat valve (16) is opened, and the circulation pump (15) is operated, whereby the water heating section (19 ) Is heated by the water heating unit (19) → reheating valve (16) → heating unit for reheating heat exchanger (13) → systern (14) → circulation pump (15) → water heating unit ( 19) It circulates along the route connected to. In addition, the remedy pump (53) is activated and the bath water in the tub (51) circulates in the secondary circuit for remedy (5), and this circulated bath water is added in the remedy heat exchanger (13). Heating with the hot water in the primary circuit (C) for dredging starts the chasing operation. Then, when the temperature detected by the incoming water temperature sensor (S1) provided in the vicinity of the inflow portion of the heat exchanger for reheating (13), that is, the temperature of the bathing water in the bathtub (51) reaches the reheating set temperature, the reheating is performed. The operation is stopped.
JP-A-9-292131

However, in the above-described conventional one, when the bathtub (51) is chased, the on-off valve type chasing valve (16) disposed in the chasing primary circuit (C) is maintained in a fully opened state. Accordingly, a large amount of heat is supplied from the water heating section (19) to the remedy primary circuit (C), and as a result, the temperature of the bath water absorbed by the remedy heat exchanger (13) increases. For this reason, in the above-mentioned conventional one, there is a problem that the hot bath water discharged to the bathtub (51) acts on the bather and gives unpleasant feeling.
In order to solve the above problem, it is conceivable to reduce the combustion amount of the gas burner (11) of the water heating section (19) and lower the temperature of the hot water flowing into the primary circuit for remedy (C). In such a case, since the heat radiation amount of the radiator such as the fan convector (21) becomes low, it becomes impossible to secure a sufficient heating capacity.

  In addition, if a reheating operation is performed during non-heating when the fan convector (21) or the heat dissipating mat (31) is not used, at the initial rise of the hot water temperature until the hot water begins to flow out from the water heating section (19). The water temperature in the primary circuit for dredging (C) becomes lower than the temperature of the bath water flowing through the secondary circuit for dredging (5). Under such conditions, the remedy heat exchanger (13) functions as a radiator, and bathing water to be crushed is cooled by the remedy heat exchanger (13). As a result, low-temperature bathing water is discharged into the bathtub (51) and the low-temperature water acts on the bather. This also gives the bather an unpleasant feeling.

The present invention has been made in view of such points,
`` A main circulation circuit (10) equipped with a water heating part (19) and a circulation pump (15),
A primary circuit for remedy (C) connected in parallel to a part of the main circulation circuit (10) and provided with a heating part of a heat exchanger for remedy (13) and a remedy valve (16),
A secondary circuit for remedy (5) that circulates between the heat absorption part of the heat exchanger for remedy (13) and the bathtub (51) and includes a remedy pump (53),
A heating radiator that dissipates the heat of hot water circulating through the main circuit (10) is connected to the main circuit (10),
In the hot water supply device in which the water heating unit (19), the circulation pump (15), and the additional pump (53) operate when the bathtub (51) is replenished, bathing water at a temperature that causes discomfort to the bather is obtained. The problem is to prevent the secondary circuit for remedy (5) from being discharged into the bathtub (51).

[Invention of Claim 1]
The technical means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
`` The remedy valve (16) is a flow control valve that is maintained in a substantially closed state while the remedy is stopped, while being set to a predetermined opening during the remedy,
Heating the bathing water of the secondary circuit for remedy (5) flowing through the heat absorbing part of the heat exchanger for remedy (13) by controlling the opening degree of the remedy valve (16).
Here, the “substantially closed state” means a degree of valve closing to the extent that the following effects can be obtained, and is a concept including fully closed and substantially fully closed.
The technical means operates as follows.
When the chasing operation is started, hot water is heated and generated in the water heating section (19), and the chasing valve (16) is set to a predetermined opening. In addition, the circulation pump (15) and the memory pump (53) are operated. Then, of the hot water flowing through the main circulation circuit (10) including the water heating unit (19) and the circulation pump (15), the additional valve (16) (set to a predetermined opening) is provided. The hot water diverted to the primary heat exchanger (C) exchanges heat with the bath water flowing through the secondary heat exchanger circuit (5) in the heat exchanger for heat exchanger (13). It is memorialized.

  And, according to the above technical means, for example, at the time of hot water rising when low temperature water flows out from the water heating unit (19) or at the time of high temperature hot water flowing out of high temperature water from the water heating unit (19), Set the temperature of bathing water discharged from the secondary circuit for remedy (5) to the bathtub (51) to an appropriate temperature by maintaining 16) in a substantially closed state or in a throttled state. It is possible to prevent discharge of low temperature water or high temperature water that gives the bather an uncomfortable feeling into the bathtub (51).

[Invention of Claim 2]
In the invention according to claim 1,
`` A tapping temperature sensor (18) is provided between the branch point of the primary circuit for tracking (C) in the main circulation circuit (10) and the discharge part of the water heating part (19),
When the temperature detected by the tapping temperature sensor (18) during reheating exceeds a preset upper limit temperature, the opening of the regenerative valve (16) is reduced as compared to the case where the temperature is lower than the upper limit temperature. Can be.
In this case, during the above-mentioned chasing, if the temperature detected by the tapping temperature sensor (18) exceeds a preset upper limit temperature, the opening degree of the chasing valve (16) is throttled, thereby The amount of heat supplied to the primary circuit (C) is reduced. Therefore, it is possible to prevent the bath water flowing through the secondary circuit for remedy (5) from becoming too high temperature, and high temperature water is not discharged from the secondary circuit for remedy (5) into the bathtub (51). Therefore, it is possible to prevent discomfort caused by the hot bathing water acting on the bather.

[Invention of Claim 3]
In the invention according to claim 1 or 2,
`` A secondary circuit water temperature sensor (S2) is provided between the discharge section of the tracking heat exchanger (13) in the tracking secondary circuit (5) and the bathtub (51),
When the temperature detected by the secondary circuit water temperature sensor (S2) at the time of tracking exceeds a predetermined secondary circuit upper limit temperature, the additional valve (16) is compared to a case where the temperature is lower than the secondary circuit upper limit temperature. The degree of opening is reduced.
According to the above technical means, the temperature of the bath water discharged from the secondary circuit for remedy (5) into the bathtub (51) (the temperature detected by the secondary circuit water temperature sensor (S2)) is preset to the secondary. When the circuit upper limit temperature is exceeded, the opening degree of the remedy valve (16) is reduced, thereby reducing the amount of heat supplied to the remedy primary circuit (C). Therefore, it is possible to prevent discomfort caused by the hot water acting on the bather. Moreover, in the invention which limited the structure of Claim 3 with respect to the invention which concerns on Claim 2, in addition to the effect of the invention of Claim 2, the effect of the invention of Claim 3 is superimposed, and, thereby, the said discomfort is reduced. This can be prevented more reliably.

[Invention of Claim 4]
In the invention according to claim 1 or 2,
`` A secondary circuit water temperature sensor (S2) is provided between the discharge section of the tracking heat exchanger (13) in the tracking secondary circuit (5) and the bathtub (51),
Incoming water temperature sensor (S1) is provided between the inflow part of the heat exchanger for tracking (13) and the bathtub (51) in the secondary circuit for tracking (5),
When the temperature difference between the detected temperature of the secondary circuit water temperature sensor (S2) and the detected temperature of the incoming water temperature sensor (S1) exceeds the predetermined reference temperature difference at the time of tracking The opening of the remedy valve (16) is throttled compared to “.
The technical means operates as follows.
The temperature experienced by the bather from the bath water discharged from the secondary circuit for remedy (5) to the bathtub (51) (hot water heated by the heat exchanger for remembrance (13)) The difference becomes significant as the temperature difference between the water and the bath water already stored in the bathtub (51) increases. However, according to the above technical means, the bath water (hot water heated by the heat exchanger for remedy (13)) discharged from the tub (51) and the heat exchanger for remedy (13 If the temperature difference between the bathing water flowing into the water), that is, the detected temperature of the secondary circuit water temperature sensor (S2) and the detected temperature of the incoming water temperature sensor (S1) exceeds the reference temperature difference, the regenerative valve (16 ) Is reduced. Accordingly, high temperature water is prevented from being discharged from the secondary circuit for remedy (5) to the bathtub (51), thereby preventing discomfort given to the bather. Therefore, it is possible to prevent discomfort caused by the hot water acting on the bather. Moreover, in the invention which limited the structure of Claim 4 with respect to the invention which concerns on Claim 2, in addition to the effect of Invention of Claim 2, the effect of Invention of Claim 4 is superimposed, thereby, the said discomfort is reduced. This can be prevented more reliably.

[Invention of Claim 5]
In the invention which concerns on Claims 1-4 for solving the said subject,
`` At the time of reheating, a tapping temperature sensor (between the branch point of the reheating primary circuit (C) in the main circulation circuit (10) and the discharge section of the main heat exchanger (12) ( When the detected temperature of 18) is lower than a preset lower limit temperature, the remedy valve (16) is maintained substantially closed ”.
In this case, the temperature detected by the tapping temperature sensor (18) is lower than the lower limit temperature when the hot water temperature rises when the low temperature water flows out from the water heating section (19). 16) is maintained substantially closed. Therefore, it is prevented that the bath water circulating in the secondary circuit for remedy (5) is cooled by the heat exchanger for remedy (13), thereby discharging low temperature water into the bathtub (51). There will be no discomfort for bathers.

The present invention has the following specific effects.
When low-temperature water or high-temperature water other than the appropriate temperature flows out from the water heating section (19), the remedy valve (16) is maintained in a closed state or maintained in a throttled state to The temperature of bathing water discharged from the secondary circuit (5) for the bath to the bathtub (51) can be set to an appropriate temperature, and low-temperature water or hot water that gives the bather discomfort is discharged into the bathtub (51). Can be prevented.
In the invention in which the configurations of claims 3 and 4 are limited to the invention of claim 2, as described above, the unpleasant feeling given to the bather can be more reliably prevented.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a water circuit diagram showing the embodiment of the invention.
The main circulation circuit (10) formed in the appliance body (1) is composed of a main heat exchanger (12) constituting the water heating unit (19) → a tapping temperature sensor (18) → a throttle area (23) → a systern ( 14) → circulation pump (15) → main heat exchanger (12). Further, the circuit between the discharge part (120) and the systern (14) of the main heat exchanger (12) in the main circulation circuit (10) is in parallel with a part of the main circulation circuit (10). And a second heating circulation circuit (2) connected to be connected to each other, and a discharge side of the circulation pump (15) in the main circulation circuit (10). The downstream end (232) of the throttle area (23) is connected by the first heating circulation circuit (3). The downstream ends of the first and second heating circulation circuits (3) and (2) may be directly connected to the cistern (14).

Hereinafter, the details of each circuit will be further described.
[Main circuit (10)]
The throttle zone (23) that constitutes a part of the main circulation circuit (10) is a high-temperature water (flow rate necessary for raising the temperature in the first heating circulation circuit (3) to a temperature suitable for floor heating ( 80 ° C. warm water flowing out from the water heating section (19)) can be supplied to the first circulation circuit (3).
The main heat exchanger (12) of the water heating unit (19) disposed in the main circulation circuit (10) is heated by the gas burner (11) supplied with gas through the gas valve (17), and the A hot water temperature sensor (18) is attached near the discharge section (120) of the main heat exchanger (12).
In the systern (14), there are a lower limit water level sensor (141) for detecting the lower limit water level necessary for appliance operation such as heating and bathing (51), and an upper limit water level sensor (142) for detecting the upper limit water level. The overflow pipe (143) is connected to the upper side wall of the cistern (14). Further, water is supplied from the water supply circuit (4) above the systern (14), and a water supply valve (41) is inserted into the water supply circuit (4).

[About the 1st heating circulation circuit (3)]
The first heating circulation circuit (3) branched from the discharge side of the circulation pump (15) in the main circulation circuit (10) is provided with a branch connection pipe (33), and a connection provided at the tip thereof. The terminals (331), (331), and (331) are connected to heat dissipating mats (31), (31), and (31), which are heat radiators, via floor heating valves (332), (332), and (332). And the circuit on the downstream side of the heat dissipating mats (31), (31), (31) is joined with the second heating circuit (2) to the downstream end (232) of the throttle region (23) of the main circuit (10). It is connected.

[About the second heating circuit (2)]
The upper and lower flow passages of the throttle zone (23) in the main circulation circuit (10) are connected by the second heating circulation circuit (2), and the second heating circulation circuit (2) has heat radiation for heating. Fancon vector (21) as a container is connected by hot water outlets (29) and (29).
[About memorial primary circuit (C)]
In the main circuit (10), the primary circuit (C) for branching branched from between the discharge section (120) of the main heat exchanger (12) and the throttle area (23) is connected to the bottom of the systern (14). ing. Therefore, the memorial primary circuit (C) is connected in parallel to the circuit connected to the branch point → the aperture region (23) → the systole (14).
The primary circuit for remedy (C) includes a remedy valve (16) composed of a flow control valve and a heating unit for the remedy heat exchanger (13), and a remedy heat exchanger (13 ) Secondary circuit of the heat exchanger (13) for the heat exchanger (13) for the heat exchanger (13) circulates from the bathtub (51) → the heat pump (53) → the heat exchanger for heat exchanger (13). It consists of the next circuit (5). The remedy heat exchanger (13) surrounds the inner cylinder (130) constituting the downstream circuit of the remedy valve (16) of the remedy primary circuit (C) and the remedy secondary circuit (C). It is formed in a double cylinder shape composed of an outer cylinder (54) constituting a part of the next circuit (5).

Further, between the discharge part (131) and the bathtub (51) of the additional heat exchanger (13) in the auxiliary secondary circuit (5), the bath water discharged to the bathtub (51) is provided. A secondary circuit water temperature sensor (S2) for detecting temperature is provided. On the other hand, the temperature of the bath water flowing from the bathtub (51) into the heat exchanger for remedy (13) is detected between the inflow part (133) of the remedy heat exchanger (13) and the tub (51). An incoming water temperature sensor (S1) is provided.
A hot water tube (78) drawn from a heat exchanger (not shown) is connected to the secondary circuit (5) for remedy, and when a hot water switch (not shown) is operated, the hot water tube (78) is connected to the bathtub. A set amount of hot water is supplied into (51) and is filled with water.

[About control devices]
FIG. 2 is an explanatory diagram of a control device for each electrical component such as the remnant pump (53).
On the input section of the control device (6) incorporating a microcomputer, etc., there are a tracking switch (72) and a tracking temperature setting button provided on the remote control device (76) installed in the kitchen, bathroom, etc. (77) and the outputs of the first to third floor heating switches (73), (74) and (75) are applied. Also, the input of the control device (6) detects the output of the operation switch (71) disposed in the instrument body (1) and the temperature of the discharge part (120) of the main heat exchanger (12). The output of the hot water temperature sensor (18) is applied, and a signal indicating whether or not the terminal operation switch (221) of the fan convector (21) is operated is applied.
In addition, the output unit of the control device (6) includes a circulation pump (15), an additional valve (16), floor heating valves (332) (332) (332), a lower limit water level sensor (141), and an upper limit water level sensor. (142), a gas valve (17), a water supply valve (41), and a remedy pump (53) are connected.

[Control action]
A control program having the contents shown in the flowchart of FIG. 3 is stored in the microcomputer incorporated in the control device (6), and the actual operation of the hot water supply apparatus according to the present embodiment will be described below with reference to FIG. To do.
First, when the operation switch (71) is turned on, in step (ST1), the valve opening K of the remedy valve (16) is set to be fully closed. Next, steps (ST2) to (ST4) are repeated, whereby the reheating switch (72), the first to third floor heating switches (73) (74) (75), and the fan convector (21) are heated. Monitor the operation of the heating switch (211).

《Remembrance control》
When the operation of the tracking switch (72) is confirmed in step (ST2), the flag F1 is set to “0” in step (ST5) and the tracking pump (53) and the circulation pump (15) are operated. Then, the bathing water is moved into the bathtub (51) by the operation of the remedy pump (53) → the place where the water temperature sensor (S1) is placed → the remedy pump (53) → the heat exchanger for remedy (13) → the secondary circuit It circulates in the secondary circuit for remedy (5) connected to the arrangement part of the water temperature sensor (S2) → the bathtub (51). Discharged water from the water heating section (19) is disposed along the main circulation circuit (10), where the hot water temperature sensor (18) is arranged → throttle area (23) → systern (14) → circulation pump (15) → It circulates along the route connected to the water heating section (19).

  Next, in step (ST6), the combustion amount of the gas burner (11) is started to be controlled so that the detected temperature of the tapping temperature sensor (18) becomes 80 ° C. which is the tapping temperature setting. That is, an igniter (not shown) is operated to ignite the gas burner (11), and the gas burner (11) is adjusted while adjusting the opening of the gas valve (17) so that the temperature detected by the tapping temperature sensor (18) approaches 80 ° C. Control the amount of combustion. In this case, for a while after the start of combustion of the gas burner (11) (when the hot water temperature rises), hot water having a temperature lower than the set temperature of the hot water (80 ° C) flows out from the main heat exchanger (12) of the water heating section (19). To do. Therefore, at this time, if the opening degree of the remedy valve (16) is increased, the remedy heat exchanger (13) functions as a radiator and bathing water (for example, about 36 ° C.) to be remedied. However, the cooled low-temperature water may act on the bather in the bathtub (51) to cause discomfort. Therefore, in the present embodiment, in step (ST7), the detected temperature T0 of the tapping temperature sensor (18) is the additional temperature set as the lower limit temperature that is the specific matter of the invention described above (the additional temperature provided in the remote control device (76)).温度 Temperature setting button (77) is set to determine whether the temperature is lower than the setting temperature. If the temperature is lower than the additional setting temperature, the valve opening K of the additional valve (16) is fully closed in step (ST8). maintain. As a result, when the temperature detected by the tapping temperature sensor (18) is lower than the reheating set temperature, heat is not exchanged in the reheating heat exchanger (13), and there is no inconvenience that gives the bather the above discomfort. . In the present embodiment, the valve opening K of the remedy valve (16) is fully closed in step (ST8), but it may be slightly opened as long as it does not give the bather the above discomfort. In this embodiment, the ON command for the circulation pump (15) is executed in step (ST5). However, when the step (ST7) is executed, the ON command for the circulation pump (15) may be executed.

  On the other hand, when it is confirmed in step (ST7) that the detected temperature T0 of the tapping temperature sensor (18) exceeds the memorial set temperature, step (ST9) is executed, and the detected temperature of the tapping temperature sensor (18) is detected. It is determined whether or not T0 exceeds 60 ° C. as the upper limit temperature, which is a specific matter of the invention described above. And when not exceeding, step (ST10) is performed and it is judged whether the valve-opening degree K of the memory valve (16) has already reached the maximum opening degree. That is, it is determined whether or not the flag F1 is “2” (indicating that the relief valve (16) is at the maximum opening). If the flag F1 is not "2", the flag F1 is set to "2" in step (ST11), and the valve opening K of the remedy valve (16) is maximized. The maximum amount of heat is transmitted from (C) to the memorial secondary circuit (5). The maximum amount of heat is transmitted from the primary circuit for remedy (C) to the secondary circuit for remedy (5) because the detected temperature T0 of the tapping temperature sensor (18) is equal to or higher than the remedy set temperature (determined by step (ST7)). Because it is 60 ° C. or less (determined in step (ST9)), there is no fear that hot bathing water will be discharged into the bathtub (51), so that the chasing is quick. The purpose.

  On the other hand, if it is determined that the detected temperature T0 of the tapping temperature sensor (18) exceeds 60 ° C. when the step (ST9) is executed, the step (ST12) is executed and the valve of the regenerative valve (16) is It is determined whether or not the opening degree K is already in the throttle state (in this embodiment, the opening degree is 70% of the maximum opening degree). That is, it is determined whether or not the flag F1 is “1” (indicating that the remedy valve (16) is 70% of the maximum opening). If the flag F1 is not "1", the flag F1 is set to "1" in step (ST13), and the valve opening K of the remedy valve (16) is reduced to 70% of the maximum opening, and the remedy is performed. Limit the amount of heat transfer from the primary circuit (C) to the secondary circuit for remedy (5). This prevents the bath water discharged from the heat exchanger for remedy (13) provided in the secondary circuit for remedy (5) from becoming too hot, and the secondary circuit for remedy (5) Hot bath water is not discharged from the tub (51). Therefore, the discomfort due to the hot bathing water acting on the bather can be prevented. In the present embodiment, depending on whether or not the temperature detected by the tapping temperature sensor (18) exceeds 60 ° C., the valve opening K of the remedy valve (16) is set to the maximum opening and 70% thereof. It was set to the stage (see steps (ST9) to (ST13)), but the temperature detected by the tapping temperature sensor (18) was compared with multiple reference temperatures, and depending on whether or not each reference temperature was exceeded. The valve opening K of the memory valve (16) may be set in a plurality of stages. The valve opening K may be changed linearly.

Next, in step (ST14), it is determined whether or not the detected temperature T2 of the secondary circuit water temperature sensor (S2) (the temperature of the bath water discharged to the bathtub (51)) is higher than 50 ° C. In this case, the valve opening K of the remedy valve (16) is reduced by 5% in step (ST15). That is, K = (K−5)% is set, so that hot bath water discharged from the secondary circuit for remedy (5) to the bathtub (51) acts on the bather and gives unpleasant feeling. Prevent inconveniences more reliably. On the other hand, if it is determined that the detected temperature T2 of the secondary circuit water temperature sensor (S2) is 50 ° C. or less when the step (ST14) is executed, the valve opening of the relief valve (16) is determined in the step (ST16). Increase K by 5%. That is, K = (K + 5)% is set, thereby speeding up the chasing.
In this way, the temperature of the bath water discharged to the bathtub (51) by steps (ST14) to (ST16) is such that the bather does not feel uncomfortable and can be quickly chased (in this embodiment). Set to 50 ° C.).

  Next, in step (ST17), it is determined whether or not the detected temperature T1 of the incoming water temperature sensor (S1) has risen to the memory setting temperature set by the memory temperature setting button (77) of the remote control device (76). If the temperature has not risen, control is returned to step (ST6). If the temperature has risen, the chasing pump (53) is stopped at step (ST18) to end chasing. Thereafter, if it is determined in step (ST19) that the heating operation (floor heating by the heat dissipating mat (31) and hot air heating by the fan convector (21)) is not performed, the gas burner (11 ) Is extinguished and the circulation pump (15) is stopped to return the control to step (ST1). On the other hand, when it is determined in step (ST19) that the heating operation is being performed, the control is directly returned to step (ST1).

As described above, in the present embodiment, when the hot water flowing out from the water heating unit (19) is hot, the valve opening K of the flow control valve (16) is throttled from the maximum opening. It is possible to prevent the bathing water flowing through the next circuit (5) from becoming too hot, and the hot water is not discharged into the bathtub (51). Therefore, the discomfort due to the hot bathing water acting on the bather can be prevented.
Further, by the control of steps (ST14) to (ST16), quick pursuit can be realized and uncomfortable feeling given to the bather can be prevented more reliably.
Furthermore, when the temperature of the hot water flowing out from the water heating unit (19) is low by the control of steps (ST7) and (ST8), the opening degree of the flow control valve (16) is throttled, so that the low-temperature bathing water is used by the bather. Discomfort caused by acting on can be prevented.

《Floor heating control》
When it is confirmed that the first to third floor heating switches (73), (74), and (75) are operated when step (ST3) is executed, the floor heating operation is executed.
When the first to third floor heating switches (73), (74), and (75) are operated, the control operation is transferred from step (ST3) to a floor heating process (not shown). In this floor heating process, the floor heating valves (332), (332) and (332) corresponding to the operated first to third floor heating switches (73), (74) and (75) are opened, and the gas burner (11 ) Is combusted, and the circulation pump (15) is maintained in the operating state.
In this floor heating operation, the control operation differs depending on conditions such as whether the bathtub (51) is being chased or whether the fan convector (21) is in use. That is, when the reheating in the bathtub (51) is not carried out and the fan convector (21) is not used, that is, the retreating valve (16) is substantially closed and the fan convector (21) When the boiler is in a stopped state, the combustion amount of the gas burner (11) is controlled so that the hot water temperature detected by the hot water temperature sensor (18) disposed in the discharge part of the main heat exchanger (12) is 60 ° C. To do. As a result, the hot water at the temperature is circulated in the main circulation circuit (10), and a part of the circulation water is branched from the discharge part of the circulation pump (15) to the first heating circulation circuit (3) side. Thus, warm water is supplied to the heat dissipating mats (31), (31), and (31) to perform floor heating. On the other hand, if the bathtub (51) is reheated or the fan convector (21) is used, the temperature of the hot water generated by heating in the main heat exchanger (12) is the heat exchange for recuperation. The temperature is lowered by the heater (13) and the fan convector (21), and the hot water whose temperature has been lowered is sucked by the circulation pump (15) through the cistern (14) and is discharged from the discharge section to the first heating circulation circuit (3) side. To be supplied. Accordingly, in such a case, the combustion amount of the gas burner (11) is controlled so that the hot water temperature detected by the hot water temperature sensor (18) is about 80 ° C. Then, the hot water temperature after the temperature drops due to the reheating of the bathtub (51) or the use of the fan convector (21) becomes about 50 ° C to 60 ° C suitable for floor heating, and the hot water is supplied to the first heating circulation circuit (3 ) Can be used for floor heating.

《Hot air heating control》
When the hot air heating switch (211) of the fan convector (21) is operated, the control operation is transferred from the step (ST4) to a hot air heating process (not shown).
When the fan convector (21) starts to operate by operating the hot air heating switch (211), the microcomputer in the control device (6) that monitors the ON-OFF state of the fan convector (21) Detects that (21) is turned on and activates the circulation pump (15), and controls the combustion amount of the gas burner (11) so that the hot water temperature detected by the tapping temperature sensor (18) is about 80 ° C. To do.
Then, the warm water generated by heating in the main heat exchanger (12) is supplied from the upstream portion of the throttle zone (23) in the main circulation circuit (10) to the second heating circulation circuit (2) on the fan convector (21) side. Thus, the hot air heating operation proceeds by returning to the systern (14) via the fan convector (21).
In the flowchart of FIG. 3, both the control of steps (ST9) to (ST13) and the control of steps (ST14) to (ST16) are provided, but the control of steps (ST9) to (ST13) Alternatively, only one of the controls of steps (ST14) to (ST16) may be provided.

[Second Embodiment]
FIG. 4 is a control flowchart according to the second embodiment of the present invention.
This flowchart is configured in the same manner as that of FIG. 3 except that the control corresponding to steps (ST14) to (ST16) of the flowchart of FIG. 3 is changed to steps (ST14A) to (ST16A). ing. Therefore, only the control of steps (ST14A) to (ST16A) different from FIG. 3 will be described.
In step (ST14A), the difference between the bathing water temperature before and after being heated and heated in the heat exchanger for remedy (13), that is, the detected temperature T2 of the secondary circuit water temperature sensor (S2) and the incoming water temperature sensor (S1) It is determined whether or not the difference between the detected temperatures T1 is greater than 20 deg as the reference temperature difference, which is the above-mentioned invention specific matter. And if it is larger than 20 deg, since the bathing water discharged from the memorial secondary circuit (5) to the bathtub (51) acts on the bather, the temperature is high, and there is a risk of discomfort. In such a case, the valve opening K of the remedy valve (16) is reduced by 5% in step (ST15A). That is, K = (K−5)% is set, so that hot bath water discharged from the secondary circuit for remedy (5) to the bathtub (51) acts on the bather and gives unpleasant feeling. Prevent inconvenience. On the other hand, if it is determined that the difference (T2−T1) in the detected temperature is 20 degrees or less when the step (ST14A) is executed, the valve opening K of the relief valve (16) is set to 5 in the step (ST16A) %increase. That is, K = (K + 5)% is set, thereby speeding up the chasing.
In this way, the temperature of the bath water discharged to the bathtub (51) is controlled by steps (ST14A) to (ST16A) so as to approach the temperature at which the bather is not uncomfortable and can be quickly chased. The
In the flowchart of FIG. 4, both the control of steps (ST9) to (ST13) and the control of steps (ST14A) to (ST16A) are provided, but the control of steps (ST9) to (ST13) Alternatively, only one of the controls of steps (ST14A) to (ST16A) may be provided.

[Others]
1. In the above embodiment, in step (ST7), the detection temperature T0 of the tapping temperature sensor (18) and the tracking set temperature (set by the tracking temperature setting button (77) provided on the remote control device (76)) are set. However, the detection temperature T0 may be compared with a predetermined fixed temperature.
2. As the detected temperature T1 of the incoming water temperature sensor (S1) provided in the secondary circuit for remedy (5) approaches the remedy set temperature (the temperature set by the remedy temperature setting button (77)), the remedy valve The opening degree of (16) may be reduced. When the heat exchanger for remedy (13) has the ability to raise the bath water passing through the heat exchanger by a set temperature, the detected temperature T1 (temperature in the bathtub) of the water temperature sensor (S1) If the remedy valve (16) is not throttled when the remedy end temperature comes close to the remedy set temperature, the bath water discharged from the remedy secondary circuit (5) to the bathtub (51) The temperature of becomes high. Therefore, as the detected temperature T1 of the incoming water temperature sensor (S1) approaches the remedy setting temperature (the temperature set by the remedy temperature setting button (77)), the opening of the remedy valve (16) is narrowed. The hot bath water is prevented from being discharged into the bathtub (51).

Water circuit diagram of a hot water supply apparatus according to an embodiment of the present invention Control circuit diagram of the hot water supply apparatus of FIG. Control flow chart for explaining the first embodiment of the present invention Control flowchart for explaining a second embodiment of the present invention Schematic of the water circuit of the hot water supply apparatus that is the subject of the invention

Explanation of symbols

(5) ... Secondary circuit for remembrance
(10) ... Main circuit
(13) ・ ・ ・ Heat exchanger for remembrance
(14) ・ ・ ・ Sistern
(15) ・ ・ ・ Circulating pump
(16) ... memorial valve
(18) ... Hot water temperature sensor
(19) ・ ・ ・ Water heating unit
(51) ... bathtub
(53) ・ ・ ・ Memorial pump
(C) ・ ・ ・ Primary circuit for remembrance
(S1) ・ ・ ・ Incoming water temperature sensor
(S2) ... Secondary circuit water temperature sensor

Claims (5)

A main circulation circuit (10) equipped with a water heating section (19) and a circulation pump (15);
A primary circuit for remedy (C) connected in parallel to a part of the main circulation circuit (10) and provided with a heating part of a heat exchanger for remedy (13) and a remedy valve (16),
A secondary circuit for remedy (5) that circulates between the heat absorption part of the heat exchanger for remedy (13) and the bathtub (51) and includes a remedy pump (53),
A heating radiator that dissipates the heat of hot water circulating through the main circuit (10) is connected to the main circuit (10),
In the hot water supply device in which the water heating unit (19), the circulation pump (15) and the additional pump (53) are operated when the bathtub (51) is added,
The remedy valve (16) is a flow rate control valve that is maintained in a substantially closed state while the remedy is stopped, while being set at a predetermined opening during the remedy,
A hot water supply apparatus for heating the bathing water of the secondary circuit for remedy (5) flowing through the heat absorption part of the heat exchanger for remedy (13) by controlling the opening degree of the remedy valve (16). In the hot water supply apparatus according to claim 1,
A tapping temperature sensor (18) is provided between a branch point of the primary circuit for tracking (C) in the main circulation circuit (10) and a discharge part of the water heating unit (19),
When the detected temperature of the tapping temperature sensor (18) at the time of chasing exceeds a preset upper limit temperature, the opening degree of the chasing valve (16) is reduced compared to the case where the temperature is equal to or lower than the upper limit temperature. Hot water supply device. In the hot water supply apparatus according to claim 1 or 2,
A secondary circuit water temperature sensor (S2) is provided between the discharge section of the tracking heat exchanger (13) and the bathtub (51) in the tracking secondary circuit (5),
When the temperature detected by the secondary circuit water temperature sensor (S2) at the time of tracking exceeds a predetermined secondary circuit upper limit temperature, the additional valve (16) is compared to a case where the temperature is lower than the secondary circuit upper limit temperature. A hot water supply device that reduces the degree of opening. In the hot water supply apparatus according to claim 1 or 2,
A secondary circuit water temperature sensor (S2) is provided between the discharge section of the tracking heat exchanger (13) and the bathtub (51) in the tracking secondary circuit (5),
Incoming water temperature sensor (S1) is provided between the inflow part of the heat exchanger for tracking (13) and the bathtub (51) in the secondary circuit for tracking (5),
When the temperature difference between the detected temperature of the secondary circuit water temperature sensor (S2) and the detected temperature of the incoming water temperature sensor (S1) exceeds the predetermined reference temperature difference at the time of tracking The hot water supply device in which the opening degree of the remedy valve (16) is reduced as compared with the above. In the hot water supply apparatus according to any one of claims 1 to 4,
During reheating, a tapping temperature sensor (18) provided between a branch point of the reheating primary circuit (C) in the main circulation circuit (10) and a discharge portion of the main heat exchanger (12). The hot water supply device that keeps the remedy valve (16) substantially closed when the detected temperature is lower than a preset lower limit temperature.

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