KR20050063697A - Storage type hot water supply apparatus - Google Patents

Abstract

When the hot water supply to the faucet and the hot water supply to the bathtub are performed using separate mixing valves, hot water supply of stable temperature is possible even when the hot water is poured into the bathtub.

When it is determined that the pouring into the bathtub has started during the hot water supply to the faucet, and when the pouring into the bathtub is judged to be stopped (steps 140 and 156), the mixing valve for the hot water supply to the faucet based on the bath setting temperature and the hot water setting temperature. Set the correction amount of the valve opening degree (steps 148, 152, 164, and 168), and correct the valve opening degree of the hot water mixing valve in the direction of suppressing the change in the hot water temperature in accordance with the timing of pouring start or pouring stop (step 150, 154, 166, 170). Therefore, it is possible to hot water the tap at a stable temperature.

Description

Storage type hot water supply device {STORAGE TYPE HOT WATER SUPPLY APPARATUS}

The present invention relates to a low temperature hot water supply device such as a heat pump type hot water supply device for storing hot water generated by heating water through a refrigeration cycle in a low temperature tank.

The low temperature hot water supply device for supplying hot water stored in the hot water tank to a bathtub or a faucet includes a heat pump type hot water supply device (hereinafter, referred to as a 'water hot water supply device') that stores hot water generated by heating water using a refrigeration cycle in a hot water tank. There is).

Such a low temperature hot water supply device is provided with a heat pump unit in which a refrigeration cycle is formed by a compressor, a heat exchanger for condensation of refrigerant (condenser, hereinafter simply referred to as a heat exchanger), an evaporator, an expansion valve, and the like. By performing heat exchange between the refrigerant and water, the water is heated to produce hot water. The generated hot water is stored in a water storage tank, and hot water is supplied from the water storage tank to a bath or a faucet.

At this time, the low temperature hot water supply device stores, for example, hot water at a relatively high temperature of about 60 ° C. to 85 ° C. in the hot water tank, and mixes hot water and tap water in the hot water tank at a predetermined ratio by using a mixing valve. .

In addition, the hot water supply device directly or indirectly detects the temperature of the hot water and the temperature of the hot water in the water storage tank, sets the mixing ratio of the hot water and the tap water based on the temperature and the set temperature of the hot water to be supplied, and opens the mixing valve to achieve the set mixing ratio. To control the degree. In addition, a hot water supply apparatus detects the temperature of the mixed hot water, and adjusts the opening degree (mixing ratio) of a mixing valve so that this temperature may be set temperature.

However, a low temperature hot water supply device has a single mixing valve, and it is common to supply hot water mixed in the mixing valve to a bath or a faucet. The hot water supply other than that is stopped, and it waits until the hot water supply of the priority destination is complete | finished. In addition, since the set temperature is one even when hot water is simultaneously supplied to several places, hot water of the same temperature is used. That is, the hot water supply type hot water supply device is limited to hot water supply and temperature limit when hot water is hot water.

In recent years, it has been required to remove the hot water supply limit and the temperature limit. In this regard, a low-pressure hot water supply device is proposed in which a plurality of mixing valves are provided and the mixing ratio of hot water and water can be adjusted at each mixing valve (for example, See Patent Document 1 and Patent Document 2).

As a result, hot water of different set temperatures can be supplied to each of the bathtub and the faucet.

On the other hand, the control of the mixing valve is used to detect the temperature of the mixed hot water, and the feed back method is used to adjust the valve opening degree of the mixing valve so that the temperature is a set temperature, whereby the hot water supply of the set temperature for each mixing valve It is possible.

However, for example, when two mixing valves are installed and configured to be hot water-diluted through the respective mixing valves, one faucet is opened while the other faucet is open, or one faucet is opened with both faucets open. In the case of closing, there is a problem that hunting occurs at the temperature of the mixed hot water.

That is, when one faucet is closed while the faucet connected to each of the two mixing valves is opened as shown by the broken line in Fig. 6, the hot water supply temperature for the hot tap is rapidly increased (part B in Fig. 6). In addition, when the one faucet is opened and the other faucet is closed while the other faucet is closed, the hot water supply temperature for the hot tap is rapidly lowered (part A of FIG. 6).

[Patent Document 1] Publication No. 2002-5523

[Patent Document 2] Japanese Patent Application Laid-Open No. 2003-287284

The present invention has been made in view of the above fact, and when a plurality of mixing valves is installed, the temperature of the hot water mixed in another mixing valve is suppressed by changing the amount of hot water mixed by one mixing valve. An object of the present invention is to propose a low temperature hot water supply device capable of supplying a stable temperature of hot water.

The present invention for solving the above object is a storage tank for storing hot water, first and second mixing valves for mixing the hot water supplied from the water storage tank and the water supplied by the water supply means at a predetermined ratio, respectively, The valve opening degree of the first and second mixing valves is determined based on the mixing ratio of the hot water and the water and the temperature of the mixed hot water based on the set water supply temperature set by the temperature setting means for each of the first and second mixing valves. A low temperature hot water supply device having a mixing valve control means for controlling, wherein the first detecting means detects hot water using the first mixing valve and hot water using the first mixing valve. 2nd detection means which detects hot water supply start and hot water supply stop using the said 2nd mixing valve, and the said 2nd detection means starts hot water supply using the said 2nd mixing valve. And setting means for setting a correction amount for correcting the valve opening degree of the first mixing valve when the hot water supply stop is detected, and a correction amount set by the setting means at the start of hot water supply or stop of hot water supply using the second mixing valve. And correction means for correcting the first valve opening degree on the basis of.

According to the present invention, the hot water supply temperature is controlled by setting the valve opening degree based on the set temperature while performing hot water supply. At this time, when the hot water supply using the second mixing valve is started or the hot water supply using the second mixing valve is stopped during the hot water supply using the first mixing valve, the valve opening degree of the first mixing valve is corrected.

Therefore, the change of the hot water supply temperature at the time of hot water supply using a 1st mixing valve can be suppressed.

The invention according to claim 2, wherein the correction means changes the flow rate of the hot water from the water storage tank or the flow rate of water from the water supply means in accordance with the hot water supply start and the hot water stop using the second mixing valve. The opening degree of a 1st mixing valve is changed in the direction to suppress. It is characterized by the above-mentioned.

According to the present invention, the first valve opening degree is corrected so as to suppress a change in the amount of hot water and water mixed by the first mixing valve when starting the hot water supply or stopping the hot water supply using the second mixing valve.

Therefore, the change of the hot water supply temperature at the time of hot water supply using a 1st mixing valve can be suppressed.

In the present invention as described above, the setting means may set the correction amount based on at least the hot water set temperature for the first mixing valve and the hot water set temperature for the second mixing valve. Moreover, as for the correction amount, it is more preferable to add the temperature of the hot water in a boiling water tank, the temperature of water, or the temperature corresponding to these temperatures in addition to the said parameter.

On the other hand, the invention according to claim 4 includes estimation means for determining the hot water supply start and the hot water stop using the second mixing valve before the hot water supply start and the hot water stop using the second mixing valve, instead of the second detection means. And the correction means corrects the valve opening degree of the first mixing valve in accordance with the timing of the hot water supply start or the hot water stop using the second mixing valve.

According to the present invention, hot water supply start and hot water stop using the second mixing valve are predicted. Therefore, the valve opening degree of the first mixing valve can be corrected in accordance with the hot water supply start and the hot water stop using the second mixing valve, so that the change in the hot water temperature using the first mixing valve can be reliably suppressed and maintained at a stable hot water temperature. have.

In the present invention as described above, the first mixing valve may be used for hot water supply to the faucet, and the second mixing valve may be used for pouring water to the bathtub.

Therefore, it is possible to predict the hot water supply start and hot water stop using the second mixing valve, and at the same time, it is possible to hot water the tap at a stable temperature.

Hereinafter, an example of embodiment of this invention is described in detail with reference to drawings.

[First Embodiment]

Fig. 1 shows a schematic configuration of a heat pump type hot water supply device (hereinafter referred to as 'water supply device 10') applied as a low temperature hot water supply device according to the present embodiment.

The hot water supply device 10 includes a heat pump unit 12 and a hot water supply unit 14, and is configured to enable hot water supply from the hot water supply unit 14 to the bathtub 16 and the plurality of faucets 18.

In the heat pump unit 12, for example, CO ₂ is used as a refrigerant, a compressor 20 for compressing the refrigerant at high temperature and high pressure, and a refrigerant logarithmic heat exchanger for heat-exchanging water with the compressed refrigerant. A refrigeration cycle is formed in which the refrigerant is circulated through the phosphorus heating heat exchanger 22, the electric expansion valve 24, the evaporator 16 and the accumulator 28, which perform heat exchange between the outside air and the refrigerant.

The hot water supply unit 14 is provided with a water storage tank 30 that stores hot water. A water supply pipe 32 for supplying tap water to the water storage unit 14 is connected to the water storage tank 30. The water supply pipe 32 is provided with a pressure reducing valve 34 with a check valve. As a result, the tap water is depressurized to a predetermined pressure and supplied (water supply).

In addition, a tapping pipe 36 is connected to the storage tank 30. The tip end of the tapping pipe 36 opposite to the hot water tank 30 is branched, and mixing valves 38 and 40 are provided in the branched portions.

One end of the bypass pipe 42 is connected to each of the mixing valves 38 and 40, and the other end of the bypass pipe 42 is between the hot water supply tank 30 and the pressure reducing valve 34. 32).

In addition, a bath pouring line 44 is connected to one mixing valve 38, and a faucet hot water supply line 46 is connected to the other mixing valve 40. Therefore, hot water and tap water in the boiling water tank 30 can be mixed, and the hot water to the bathtub 16 and the hot water to the faucet 18 can be performed. In addition, the tapping pipe 36 is provided with a pressure relief valve 48 for adjusting the pressure of the hot water. When the water is excessively pressurized and the pressure in the boiling water tank 30 becomes high, the pressure relief valve 48 causes the pressure relief valve 48 to adjust. The pressure is configured to open.

On the other hand, a circulation path 50 is provided between the heat pump unit 12 and the water storage tank 30. The circulation path 50 is formed by a pipe line 50A connecting the heat exchanger 22 of the heat pump unit 12 and the bottom of the water storage tank 30 and the heat exchanger 22 and the water storage tank 30. It consists of a return pipe 50B which connects an upper end part.

In addition, the circulation pump 52 is provided in the flow path 50A of the circulation path 50, and the flow control valve 54 is provided in the return pipe 50B.

Therefore, when the circulation pump 52 of the hot water supply device 10 is operated, hot water is sucked from the bottom side of the water storage tank 30 and supplied to the heat exchanger 22 of the heat pump unit 12. In addition, heat exchange with the refrigerant is performed in the heat exchanger 22 so that the heated hot water is returned to the water storage tank 30. At this time, the amount of hot water circulated through the flow control valve 54 is controlled to return the hot water heated to the predetermined temperature by the heat exchanger 22 to the water storage tank 30.

On the other hand, as shown in FIG. 2, the control board 56 is provided in the heat pump unit 12. This control board 56 is equipped with the microcomputer which is not shown in figure, and the controller 58 which controls the operation | movement of the heat pump unit 12 is provided.

In addition, as shown in Figs. 1 and 2, the heat pump unit 12 includes, for example, an outside air temperature sensor 60 that detects the temperature of air sucked for cooling the evaporator 26 as the outside air temperature. It is installed.

As shown in FIG. 2, this outside air temperature sensor 60 is connected to the controller 58. As shown in FIG. The controller 58 controls the capability of the compressor 20 (for example, the kinetic frequency of the compressor) and transmission based on the ambient air temperature detected by the outside air temperature sensor 60 and the target heating temperature set on the hot water supply unit 14 side. The degree of opening of the expansion valve 24 is controlled. That is, the heating capability of the heat pump unit 12 is controlled.

The hot water supply unit 14 is provided with a control board 62. This control board 62 is provided with the microcomputer which is not shown in figure, and the controller 64 which controls the operation | movement of the hot water supply unit 14 is provided.

The controller 58 of the heat pump unit 12 and the controller 64 of the hot water supply unit 14 are connected to each other to enable bidirectional communication via the communication line 66, and the controller 58 is a signal from the controller 64. The operation / stop of the heat pump unit 12 is controlled based on this. In addition, the controller 58 is the outside air temperature detected by the outside air temperature sensor 60 via the communication line 66, the operating frequency of the compressor 20 (heating capacity of the heat exchanger 22 of the heat pump unit 12). Is output to the controller 64.

The controller 64 is connected with a pump motor 76 and a flow control valve 54 for driving the circulation pump 52, and controls the operation of the circulation pump 52 and the opening degree of the flow control valve 54. .

In addition, as shown in FIG. 1, a temperature sensor 68 is provided on the outlet side of the heat exchanger 22 of the heat pump unit 12. As shown in Fig. 2, this temperature sensor 68 is connected to the controller 64, which causes the controller 64 to be heated by the heat exchanger 22 to return to the water storage tank 30. The heating temperature can be detected.

On the other hand, the hot water supply device 10 is provided with a bath remote control 70 and the kitchen remote control 72, the bath remote control 70 and the kitchen remote control 72 is connected to the controller 64 of the hot water supply unit 14 have.

The hot water supply device 10 enables various operation operations such as operation / stop operation, setting of hot water temperature, bath temperature, setting of an operation mode based on hot water consumption, and the like using the bath remote controller 70 to the kitchen remote controller 72. Consists of.

In this hot water supply device 10, for example, three modes of operation modes are set in accordance with the amount of hot water used, such as 'enough', 'normal' and 'saving', and the bath remote control 70 or the kitchen remote control 72 Operation is set to an arbitrary operation mode. In addition, "normal" is a preset standard amount, "sufficient" is more used than "normal", and "saving" is used less than "normal".

The controller 64 sets the target heating temperature based on this operation mode and the outside air temperature. The target heating temperature is set in advance according to the operation mode and the outside temperature. The controller 64 stores a target heating temperature table (not shown) for the operation mode and the outside temperature, and the controller 64 is based on this table. To set the target heating temperature.

In addition, the controller 58 installed in the heat pump unit 12 includes, for example, a table in which the operating frequency of the compressor 20 and the degree of opening of the electric expansion valve 26 in accordance with the outside air temperature and the target heating temperature are set in advance. The controller 58 uses this table to set the operating frequency of the compressor 20 and the valve opening of the electric expansion valve 26 based on the ambient temperature and the target heating temperature, and control based on the setting. Perform

In addition, the controller 64 determines the heating capacity of the hot water by the heat pump unit 12 (heat exchanger 22) from the operating frequency of the compressor 20, and based on this heating capacity and the outside air temperature and the target heating temperature. By predicting the flow rate of the hot water of the circulation path 50, the opening degree of the flow control valve 54 is set so that the predicted flow rate is obtained from the output of the circulation pump 52 when the circulation pump 52 is operated.

Based on this setting, the controller 64 operates the circulation pump 52 and simultaneously opens the flow regulating valve 54 to store hot water heated to the target heating temperature in the water storage tank 30. At this time, the controller 64 adjusts the opening degree of the flow rate control valve 54 based on the temperature (heating temperature) of the hot water detected through the temperature sensor 68.

However, as shown in Fig. 1, the hot water supply apparatus 10 is provided with two mixing valves 38 and 40, the mixing valve 38 is connected with a bath pouring line 44, and the mixing valve ( The faucet hot water supply line 46 is connected to 40. Thus, the hot water supply device 10 performs pouring to the bath 16 through the mixing valve 38 and hot water to the faucet 18 through the mixing valve 40.

As shown in FIG. 2, mixing valves 38 and 40 are connected to the controller 64. The controller 64 sets the outside air temperature detected by the outside air temperature sensor 60 as the temperature of the tap water, and sets the temperature (hot water temperature and bath water temperature) based on the temperature of the tap water and the temperature of the hot water stored in the boiling water tank 30. The opening degrees of the mixing valves 38 and 40 are respectively set so that hot water of is obtained. In addition, in this embodiment, although the outside air temperature detected using the outside air temperature sensor 60 is set to the temperature of tap water, you may provide a temperature sensor separately in order to detect the temperature of tap water.

In addition, as shown in Fig. 1, on the secondary side (hot water supply side) of the mixing valves 38 and 40, the hot water supply temperature sensors 80A and 80B for detecting the temperature of the mixed hot water (hereinafter referred to as 'hot water temperature sensor' (80) 'is installed. In addition, the solenoid valve 84 is provided in the bathtub pouring line 44, and when this solenoid valve 84 is opened, the pouring (hot water supply) to the bathtub 16 is made.

As shown in Fig. 2, hot water temperature sensors 80A and 80B, flow counters 82A and 82B, and a solenoid valve 84 are connected to the controller 64.

The controller 64 adjusts the opening degree of the mixing valves 38 and 40 based on the hot water temperature detected by the hot water temperature sensors 80A and 80B. That is, the feedback control of the mixing valves 38 and 40 is performed using the detected temperatures of the hot water temperature sensors 80A and 80B.

As a flow counter, for example, a pinwheel that rotates according to the flow rate of the hot water when the hot water flows is used, and the controller 64 uses the flow counters 82A and 82B to perform counting of the amount of use and the like. It is detected whether the faucet 18 is open or whether pouring water to the bathtub 16 is made.

In addition, although the pouring to the bathtub 16 may detect the operation | movement of the solenoid valve 84 instead of 82 A of flow counters, this embodiment demonstrates using the flow counter 82A as an example.

As the mixing valves 38 and 40, for example, one driven by a stepping motor to change the valve opening degree can be used.

As seen from the bypass pipe 42 side (low temperature side), the controller 64 divides between the expansion and the expansion of the mixing valves 38 and 40, for example, by 1000, and 1 (total closure) to 1000 (expansion). By setting the number of steps of the valve opening degree, and driving the mixing valves 38 and 40 at the set number of steps, the mixing valves 38 and 40 are controlled to be the set opening degree.

On the other hand, the temperature (hot water temperature) of the hot water mixed by the mixing valves 38 and 40 is the hot water temperature (hereinafter referred to as 'hot water temperature') on the storage tank 30 side, the water temperature (water temperature) and the mixing ratio {mixing The degree of opening of the valves 38 and 40 is determined, and the hot water temperature changes when the mixing ratio is changed. Therefore, the mixing ratio is replaced with the opening degree of the mixing valves 38 and 40, and the hot water supply temperature is replaced with the target temperature.

Through this, a map of the opening degree (number of driving steps) of the mixing valves 38 and 40 with respect to the tapping temperature and the set temperature for each water temperature is obtained. The controller 64 drives the mixing valves 38 and 40 based on this number of steps. When such a map is used, the valve opening degree of the mixing valves 38 and 40 can be easily obtained from the tapping temperature, the outside air temperature (water temperature), and the set temperature.

In addition, although tapping temperature may use the heating temperature detected by the temperature sensor 68, tapping temperature sensor is provided in the upper part of the boiling water tank 30 to which tapping pipe 36 is connected, and this tapping temperature sensor is used. It is more preferable to detect through.

In addition, one year may be divided into summer, winter and intermediate systems (spring and autumn), and a map of the opening degree of the mixing valves 38 and 40 with respect to the set temperature for each period may be set for simplification.

On the other hand, if the setting of the hot water temperature (hereinafter referred to as the hot water set temperature) on the mixing valve 40 side and the setting of the bath temperature on the mixing valve 38 side (hereinafter referred to as bath temperature setting) are different from each other, the mixing valve 38, The opening degree and mixing ratio of 40) are also different. Thus, for example, when the faucet 18 is opened when the solenoid valve 84 is opened and poured into the bath 16, the flow rate balance between the hot water and the water may be broken at each of the mixing valves 38 and 40.

In particular, when hot water supply (for example, pouring water) of the high set temperature is started during hot water supply to the side where the set temperature is low, the amount of hot water from the storage tank 30 to the side where the set temperature is low decreases and the amount of water increases. Therefore, the temperature of the side where the set temperature is low drops rapidly.

Here, the controller 64 uses the flow counter 82 to detect whether the hot water is being heated at each of the mixing valves 38 and 40, whether the hot water is started, or whether the hot water is stopped. One side of 40 is used to correct the valve opening degree of the mixing valve 38 or the mixing valve 40 during the hot water supply when the other hot water supply is started or stopped during the hot water supply.

The correction amount at this time is preferably determined according to the bath set temperature on the mixing valve 38 side, the hot water set temperature, the hot water temperature and the water temperature on the mixing valve 40 side, using at least the bath set temperature and the hot water set temperature. Set the correction amount. Further, the correction of the valve opening degree is performed in the direction of suppressing the balance of the flow rate of the hot water or the flow rate of the water between the mixing valves 38 and 40.

3 shows an example of the correction amount of the valve opening degree of the mixing valves 38 and 40 based on the temperature difference (set temperature difference) of the set temperature. For example, the hot water supply device 10 divides one year from the tapping temperature and the water temperature into summer, winter, and relay (spring and autumn), and the mixing valve 38, according to the temperature difference (set temperature difference) between the bath set temperature and the hot water set temperature. The correction amount (the number of drive steps to correct) of the valve opening degree of 40) is set.

In addition, in FIG. 3, the correction amount of the intermediate system is shown by the solid line, the correction amount of the winter system is shown by the two-dot chain line on the upper side of the intermediate system, and the summer correction amount is shown by the one-dot chain line on the lower side.

The controller 64 stores a map based on the correction amount in advance, and is configured to obtain the correction amount (the number of driving steps) of the openings of the mixing valves 38 and 40 from the set temperature difference together with which season corresponds to which season. have.

When the bath set temperature is set, the hot water supply device 10 configured as described above sets the opening degree of the mixing valve 38 based on the bath set temperature, tapping temperature, and water temperature. Moreover, when the hot water supply set temperature is set, the hot water supply apparatus 10 sets the valve opening degree of the mixing valve 40 based on this hot water set temperature, tapping temperature, and water temperature. Thereafter, the hot water supply device 10 controls each of the mixing valves 38 and 40 to be a set valve opening degree.

Accordingly, when the solenoid valve 84 is opened, pouring of water to the bath 16 at the bath setting temperature is performed, and when the faucet 18 is opened, boiling water at the hot water setting temperature is performed. At this time, the controller 64 installed in the hot water supply device 10 adjusts the valve opening degree of the mixing valves 38 and 40 through feedback control based on the hot water temperature detected by the hot water temperature sensors 80A and 80B. The hot water to the bathtub 16 at the bath set temperature and the hot water to the faucet 18 at the hot water set temperature are maintained.

Here, with reference to FIG. 4, the control outline of the mixing valve 38 and 40 which concerns on 1st Embodiment is demonstrated. This floor chart performs control of the mixing valves 38 and 40 based on the setting of the valve opening degree of the mixing valves 38 and 40 described above, and in parallel with each of the mixing valves 38 and 40. The same is done for the above, but the mixing valve 38 is described here as an example.

This floor chart is executed when the flow counter 82 (flow counter 82A) checks whether hot water supply (pouring) using the mixing valve 38 has been started, and when the pouring is detected, and ends when the pouring is stopped. .

When the pouring is started and executed here, in the first step 100, whether the start of the hot water supply using the mixing valve 40 in parallel with the mixing valve 38 was detected by the flow rate counter 82 (flow rate counter 82B). Check.

Here, if the faucet 18 is opened during pouring into the bathtub 16 using the mixing valve 38, affirmative determination is made at step 100 and the process proceeds to step 102.

In this step 102, the bath set temperature on the mixing valve 38 side is compared with the hot water set temperature on the mixing valve 40 side. In the next step 104, it is checked whether the bath set temperature and the hot water set temperature are the same. do. In step 106, it is checked whether the bath set temperature is high.

Here, when the bath set temperature is higher than the hot water set temperature, it is negatively determined at step 104 and at the same time, affirmatively determined at step 106 and the process proceeds to step 108.

In this step 108, the correction amount of the valve opening degree of the mixing valve 38 is set based on the bath set temperature and the hot water set temperature. In the next step 110, the valve opening degree is changed so that the valve opening degree of the mixing valve 38 is narrowed down based on the set amount of correction of the valve opening degree to increase the amount of water to be mixed.

Therefore, when the mixing valve 40 is opened, since the valve opening degree between the mixing valves 38 and 40 differs, it is suppressed that the quantity of the water which flows into the mixing valve 38 side becomes small.

On the other hand, when the bath set temperature is lower than the hot water set temperature, it is negatively determined at step 106, and the flow proceeds to step 112, and the valve opening degree of the mixing valve 38 is determined based on the bath set temperature and the hot water set temperature. Set the correction amount. Thereafter, in step 114, the valve opening degree is changed so as to increase the valve opening degree of the mixing valve 38 and reduce the amount of water to be mixed based on the set amount of correction of the valve opening degree.

Therefore, when the mixing valve 40 is opened, since the valve opening degree between the mixing valves 38 and 40 differs, it is suppressed that the quantity of the hot water which flows into the mixing valve 38 side becomes small.

In this way, when the valve opening degree of the mixing valve 38 is changed, the mixing ratio of hot water and water is temporarily changed, and when the feedback control is performed based on the hot water temperature detected by the hot water temperature sensor 80 (80A), the bath set temperature. Return to the valve opening.

On the other hand, in step 116, it is confirmed whether hot water supply from the mixing valve 40 side was stopped during pouring. Here, if the faucet 18 is closed during pouring, affirmative determination is made in step 116, and it progresses to step 118. FIG.

In this step 118, similarly to step 102, the bath set temperature and the hot water set temperature are compared. In step 120, it is checked whether the bath set temperature and the hot water set temperature are the same, and in step 122, it is checked whether the bath set temperature is high.

Here, when the bath set temperature is higher than the hot water set temperature, it is negatively determined at step 120, affirmatively determined at step 122, and the flow proceeds to step 124. In this step 124, the correction amount of the valve opening degree of the mixing valve 38 is set based on bath setting temperature and hot water setting temperature. In the next step 126, the valve opening degree is changed so as to increase the valve opening degree of the mixing valve 38 and reduce the amount of water to be mixed based on the set amount of correction of the valve opening degree.

Therefore, when the faucet 18 is closed, since the valve opening degree between the mixing valves 38 and 40 differs, it is suppressed that the quantity of the water which flows into the mixing valve 38 side increases.

On the contrary, when the bath set temperature is lower than the hot water set temperature, it is negatively determined at step 122 and the process proceeds to step 128. In this step 128, the correction amount of the valve opening degree of the mixing valve 38 is set based on bath setting temperature and hot water setting temperature. Thereafter, in step 130, the valve opening degree is changed so as to reduce the valve opening degree of the mixing valve 38 and increase the amount of water to be mixed based on the set amount of correction of the valve opening degree.

Therefore, it is suppressed that the amount of hot water flowing to the mixing valve 38 side when the faucet 18 is closed is increased.

In this way, when the other side of the mixing valves 38 and 40 is opened during hot water using one side of the mixing valves 38 and 40, the valve opening degree between the mixing valves 38 and 40 is corrected by correcting the valve opening degree based on the set temperature difference. It can be suppressed that the temperature of the hot water in a hot water supply (in pouring) changes largely through FIG.

That is, the characteristic of the set temperature difference-mixing valve opening correction amount shown in FIG. 3 is determined from the set temperature difference between the hot water set temperature and the bath set temperature. In addition, since the water temperature and the heating temperature are different depending on the season, the set temperature difference-mixing valve opening correction amount is, for example, the spring and the autumn as the intermediate system (shown by the solid line in FIG. 3), and the summer (FIG. 3). Is set by adjusting the set temperature difference-mixing valve opening degree correction amount in the dashed-dotted line in FIG. 2 and the winter season (indicated by the 2-dot dashed line in FIG. 3).

From the characteristics of the set temperature difference-mixing valve opening degree correction amount and the set temperature difference, the mixing valve opening degree correction amount DELTA Y for setting the hot water supply temperature to the set temperature is obtained.

At this time, if the mixing valve opening degree is corrected by ΔY in the number of steps (+ ΔY), the amount of water to be mixed decreases and the amount of hot water increases, so that the hot water supply temperature increases.

Therefore, when the hot water is started or the hot water is stopped during pouring, the amount of hot water is reduced or the amount of water is reduced depending on the difference between the bath set temperature and the hot water set temperature (higher than the valve opening degree of the mixing valves 38 and 40). When the valve opening degree is corrected in the direction in which the valve is opened at this increase, it is possible to suppress a change in the mixing ratio of hot water and water.

In addition, when the mixing valve opening degree is corrected to be smaller than ΔY in the step water (−ΔY), the amount of hot water to be mixed is reduced or the amount of water is increased, thereby lowering the hot water supply temperature.

Therefore, when hot water is started or hot water is stopped during pouring, the amount of water to be poured is reduced or the amount of hot water is increased depending on the difference between the bath set temperature and the hot water set temperature (higher than the valve opening degree of the mixing valves 38 and 40). When the valve opening degree is corrected in the direction in which the valve is closed at this increase, it is possible to suppress a change in the mixing ratio of hot water and water.

That is, if the correction amount ΔY is appropriately set based on the bath set temperature and the hot water set temperature, the temperature of the hot water to be poured (or the temperature of the hot water being heated) is changed even when the hot water is heated (or the hot water is poured). By suppressing, pouring or hot water of a stable temperature is attained.

In addition, in the floor chart shown in FIG. 4, the other side of the mixing valves 38 and 40 is used during hot water supply using the one side of the mixing valves 38 and 40 in consideration of when the bath setting temperature or the hot water setting temperature is changed during hot water supply. Although the correction amount is set at the time of hot water supply start and hot water stop, the correction amount may be set in advance when the bath set temperature or the hot water set temperature is set or changed, and the setting may be used.

Since the correction amount of the valve opening degree of the mixing valves 38 and 40 can at least set the bath set temperature and the hot water set temperature, preferably the bath set temperature, the hot water set temperature, the hot water temperature and the water temperature as parameters, Each time the parameter changes, it may be set in advance, and the valve opening degree of the mixing valves 38 and 40 may be corrected based on the set correction amount.

In addition, when setting a correction amount more simply, you may set so that valve opening degree may be sufficient when bath setting temperature and hot water setting temperature are the same.

In addition, although 1st Embodiment demonstrated using two mixing valves 38 and 40, it is applicable also between three or more mixing valves. In this case, when the hot water supply using the arbitrary mixing valve is started, what is necessary is just to perform so that it may be performed based on the difference of the set temperature with the mixing valve at least, ie, the difference of valve opening degree.

Second Embodiment

Next, a second embodiment of the present invention will be described. In addition, the basic structure of 2nd Embodiment is the same as that of 1st Embodiment mentioned above, and attaches | subjects the same code | symbol to the component same as 1st Embodiment in 2nd Embodiment, and demonstrates.

In the first embodiment described above, the start and stop of the hot water supply using the mixing valves 38 and 40 are detected using the flow rate counter 82. In the second embodiment, the solenoid valve 84 is provided during the hot water supply to the faucet 18. By performing the start and stop of the pouring into the bathtub 16 by opening and closing the hot water supply, the hot water supply temperature is prevented from changing.

At this time, in the second embodiment, the stoppage of the pouring or pouring into the bathtub 16 is predicted, and the valve opening degree of the mixing valve 40 is corrected in accordance with the pouring or pouring stop timing.

That is, when the pouring into the bathtub 116 is set by the operation of the bath remote controller 70 or the kitchen remote controller 72, the controller 84 opens the solenoid valve 84 to perform the pouring into the bathtub 16. When the predetermined amount of hot water is poured into 16, the solenoid valve 84 is closed to stop the pouring.

Here, since the controller 64 can predict the start of the pouring and the stop of the pouring using the mixing valve 38, the hot water supply to the faucet 18 is corrected by correcting the valve opening degree of the mixing valve 40 based on the prediction result. It certainly prevents the temperature from changing.

5 shows a schematic of the valve opening degree correction of the mixing valve 40 which is performed while predicting the pouring of the pouring into the bathtub 16 using the mixing valve 38 and the stopping of the pouring. This floor chart is executed when the hot water supply start to the faucet 18 is detected through the flow counter 82B, and ends when the hot water stop is stopped by the tap 18 being closed.

When the hot water supply is started and executed, the first step 140 checks (predicts) whether or not the hot water to the bathtub 16 is performed.

Here, when the pouring operation using the bath remote control 70 or the kitchen remote control 72 is performed, or it is determined that pouring is necessary, for example, from the remaining amount of hot water in the bath 16, affirmative determination is made in step 140 and the step ( 142).

In this step 142, a bath set temperature is compared with a hot water set temperature. Thereafter, at step 144, it is checked whether the bath set temperature and the hot water set temperature (valve opening of the mixing valve 40 and valve opening of the mixing valve 38) are the same, and at step 146, hot water setting Check whether the temperature is lower than the bath set temperature.

Here, when the hot water set temperature is lower than the bath set temperature, it is negatively determined at step 144 and affirmatively determined at step 146 to proceed to step 148. In this step 148, the correction amount of the valve opening degree of the mixing valve 40 is set based on hot water set temperature and bath set temperature. Thereafter, at step 150, the amount of hot water mixed with the water in the mixing valve 40 is increased in accordance with the timing of opening the solenoid valve 84 to start pouring into the bathtub 16. The valve opening is widened based on the correction amount.

Therefore, the hot water set temperature and the bath set temperature (valve opening of the mixing valve 38 and the valve opening of the mixing valve 40) are different from each other when the pouring into the bathtub 16 starts, and thus flows to the mixing valve 40 side. The amount of hot water decreases, and it can suppress that the temperature of the hot water heated by the tap 18 falls.

On the other hand, when the bath set temperature is lower than the hot water set temperature, it is irregularly detected at step 146 and the process proceeds to step 152, and the valve opening of the mixing valve 40 is opened based on the temperature difference between the hot water set temperature and the bath set temperature. The correction amount of the figure is set. Thereafter, at step 154, the amount of the hot water mixed with the water in the mixing valve 40 is reduced in accordance with the timing of opening the solenoid valve 84 to start pouring into the bathtub 16. The valve opening is narrowed down based on the correction amount.

Therefore, when the pouring into the bathtub 16 is started, the amount of the hot water flowing to the mixing valve 40 side increases, and it is possible to suppress the increase in the temperature of the hot water that is heated by the faucet 18.

On the other hand, in step 156, it is confirmed whether the pouring to the bathtub 16 is stopped (prediction). That is, it is checked whether the hot water of the bathtub 16 has reached a predetermined amount, or whether the operation of stopping the pouring of water is performed through the bath remote controller 70 or the kitchen remote controller 72.

Here, if the stoppage of the pouring into the bathtub 16 is predicted, affirmative determination is made in step 156 and the process proceeds to step 158. In step 158, the hot water set temperature is compared with the bath set temperature. In step 160, it is checked whether the hot water set temperature and the bath set temperature are the same. In step 162, the bath set temperature is higher than the hot water set temperature. Check for high.

If the bath set temperature is higher than the hot water set temperature, a negative determination is made at step 160, affirmative determination is made at step 162, and the flow proceeds to step 164. In this step 164, the correction amount of the valve opening degree of the mixing valve 38 is set based on bath setting temperature and hot water supply setting temperature.

After that, since the pouring to the bathtub 16 is stopped at step 166, the amount of water mixed in the mixing valve 40 is reduced in accordance with the timing at which the solenoid valve 84 is closed. The valve opening of the mixing valve 40 is narrowed.

Therefore, when the pouring water to the bathtub 16 is stopped, the quantity of the hot water flowing to the mixing valve 40 side increases, and it can suppress that the hot water supply temperature of the faucet 18 rises.

On the other hand, when the bath set temperature is lower than the hot water set temperature, it is negatively determined at step 162 and the process proceeds to step 168, and the valve opening degree of the mixing valve 38 is determined based on the bath set temperature and the hot water set temperature. Set the correction amount. Thereafter, in step 170, the valve opening degree of the mixing valve 40 is expanded in accordance with the correction amount so that the amount of hot water mixed in the mixing valve 40 increases in accordance with the timing at which the pouring into the bathtub 16 is stopped.

Therefore, when the pouring of water to the bathtub 16 is stopped, it can suppress that the temperature of the hot water supplied to the tap 18 falls.

In this way, when the other side of the mixing valves 38 and 40 is opened during hot water using one side of the mixing valves 38 and 40, the valve opening degree of the mixing valves 38 and 40 is corrected by correcting the valve opening degree based on the set temperature. From the difference of, it is possible to suppress the large change in the temperature of the hot water during the hot water supply (during pouring).

6 shows a change in the hot water supply temperature detected by the hot water supply temperature sensor 80B when pouring is performed in the bath 16 when the bath setting temperature is higher than the hot water setting temperature. At this time, the broken line in FIG. 6 indicates when only the feedback control using the hot water temperature sensor 80B is performed for the valve opening degree of the mixing valve 40, and the solid line predicts hot water start and stop along with the feedback control to set the hot water supply. It shows when the valve opening degree was correct | amended based on the difference of temperature and bath setting temperature (this Example).

As shown by the broken line in FIG. 6, when the valve opening degree of the mixing valve 40 is performed only by the feedback control, the hot water temperature is stabilized low for a few seconds immediately after the start of pouring when the pouring is started (part A of FIG. 6). Further, when the pouring is stopped, the hot water supply temperature is stabilized for a few seconds immediately after the pouring is stopped (part B of Fig. 6). Also, each few seconds is the time until the next control timing by feedback.

On the contrary, as shown by the solid line in Fig. 6, when the pouring start and pouring stop are predicted and the valve opening degree of the mixing valve 40 is corrected in accordance with the pouring start and pouring stop timing, the change in the hot water supply temperature can be reliably suppressed. have.

In this way, when the pouring into the bathtub 16 is performed during the hot water supply, the pouring start and pouring stop are predicted, and the valve opening degree of the mixing valve 40 is corrected in accordance with the pouring start and pouring stop timings. Although different from each other, hot water of stable temperature can be supplied to the faucet 18.

In addition, in 2nd Embodiment, although the change of the hot water supply temperature of the mixing valve 40 side with respect to the mixing valve 38 which can predict start and stop of pouring is suppressed, hot water supply start and hot water supply stop timing using the mixing valve 40 is carried out. If it can be predicted can be applied to the control of the mixing valve 38 used for pouring of the tub (16).

Moreover, if hot water supply start and hot water stop on the mixing valve 40 side can be predicted, it can apply to the control of the valve opening degree of a some mixing valve at the time of hot water supplying to different faucets using a some mixing valve.

In addition, although the heat pump type hot water supply apparatus 10 was demonstrated to the example in this embodiment demonstrated above, this invention can be applied to the heat pump type hot water supply apparatus of arbitrary structures, provided that a some mixing valve is provided. Moreover, this invention is not limited to a heat pump type hot water supply apparatus, It is applicable to the low temperature type hot water supply apparatus of arbitrary structure which hot water stored in a hot water tank is heated from a some mixing valve.

As described above, according to the present invention, even if the hot water supply by the second mixing valve is started or the hot water supply is stopped during the hot water supply by the first mixing valve, it is possible to suppress the temperature change of the hot water that is heated by using the first mixing valve. .

In addition, by predicting the start of pouring into the bath and the stop of pouring, an excellent effect is obtained that hot water at a stable temperature is possible even if the pouring into the bath is performed during the hot water to the faucet.

1 is a schematic configuration diagram showing a circulation path of a hot water supply device applied to the present embodiment;

2 is a schematic configuration diagram of a controller of a hot water supply device;

3 is a diagram showing an example of a correction amount of a mixing valve opening degree with respect to a set temperature difference;

4 is a flowchart showing an example of a mixing valve control according to the first embodiment;

Fig. 5 is a flowchart showing an example of hot water mixing valve control according to the second embodiment;

6 is a diagram showing an example of test results of hot water temperature change.

<Description of the symbols for the main parts of the drawings>

10 hot water supply device (heat pump type hot water supply device, low temperature hot water supply device)

12 heat pump unit

14 hot water unit

16 bath

18 faucet

30 water storage tank

32 water supply pipe (water supply means)

36 taps

38 Mixing Valve (First and Second Mixing Valve, Second Mixing Valve)

40 Mixing Valve (First and Second Mixing Valve, First Mixing Valve)

42 bypass pipe (water supply means)

44 bathtub pouring line

46 Faucet Hot Water Line

60 ambient temperature sensor

64 controller (mixing valve control means, temperature setting means, setting means, correction means, prediction means, first and second detection means)

68 temperature sensor

70 Bath remote control (prediction means, temperature setting means)

72 Kitchen remote control (prediction means, temperature setting means)

80 (80A, 80B) Hot Water Temperature Sensor

82 (82A, 82B) flow counters (first and second detection means)

84 solenoid valve

Claims (5)

Water storage tank for storing hot water, First and second mixing valves for mixing hot water supplied from the water storage tank and water supplied by a water supply means at a predetermined ratio, respectively; Valve opening degree of the first and second mixing valves based on the mixing ratio of the hot water and the water and the temperature of the mixed hot water based on the set water supply temperature set by the temperature setting means for each of the first and second mixing valves. It is a low-temperature hot water supply device having a mixing valve control means for controlling the First detecting means for detecting a hot water supply using the first mixing valve; Second detection means for detecting hot water supply start and hot water supply stop using the second mixing valve while the first detection means detects hot water supply using the first mixing valve; Setting means for setting a correction amount for correcting the valve opening degree of the first mixing valve when the second detecting means detects the hot water supply start and the hot water stop using the second mixing valve; And a correction means for correcting the opening degree of the first valve based on a correction amount set by the setting means at the start of hot water supply or stop of the hot water supply using the second mixing valve. The hot water supply from the water storage tank at the first mixing valve or the flow rate of water from the water supply means is suppressed according to claim 1, wherein the correcting means is in accordance with the hot water supply start and the hot water stop using the second mixing valve. An opening type hot water supply device, characterized in that for changing the opening degree of the first mixing valve. The low temperature type according to claim 1 or 2, wherein the setting means sets the correction amount based on at least a hot water set temperature for the first mixing valve and a hot water set temperature for the second mixing valve. water heater. The method according to claim 1 or 2, further comprising estimation means for determining the hot water supply start and the hot water stop using the second mixing valve before the hot water supply start and the hot water stop using the second mixing valve instead of the second detection means. And the correction means corrects the valve opening degree of the first mixing valve in accordance with the timing of the hot water supply start or the hot water stop using the second mixing valve. The low temperature hot water supply device according to claim 1 or 2, wherein the first mixing valve is used for hot water supply to the faucet, and the second mixing valve is used for pouring water to the bath.