KR101052334B1 - Water heater - Google Patents

Abstract

This invention makes it a subject to provide the hot water supply machine which can perform bathtub hot water supply in a short time.

The hot water heater according to the present invention includes a storage tank 1 of a refrigerant liquid (having a function of a heat medium, for example, water), a general hot water circuit C1, a bath hot water circuit C2, and a bath water circulation circuit ( C3), a general hot water supply for heat-exchanging the heat flowing through the general hot water heating circuit (C4), the bath heating circuit (C5), the water flowing through the general hot water heating circuit (C1) and the refrigerant liquid flowing through the general hot water heating circuit (C4). A heat exchanger (2) for the bath and a heat exchanger (3) for the heat exchange between the water supplied to the bath (65) and the refrigerant liquid flowing through the bath heating circuit (C5). It is connected to the water supply source 70, and it is provided so that it may join with the bathtub water circulation circuit C3 at the front end of the heat exchanger 3 for a bathtub, and the water used for bathtub hot water supply is supplied from the said water supply source 70. At the same time, characterized in that configured to be heated by the heat exchanger (3) for the bath.

Description

Hot water heater {HOT WATER SUPPLIER}

The present invention relates to a hot water heater, and more particularly, to a storage tank type hot water heater.

Conventionally, in a storage tank type hot water supply machine, it is known to heat a hot water directly to a general tapping terminal after heat-exchanging with hot water in a storage tank without introducing water from a water supply source into a storage tank (for example, For example, patent document 1 etc.).

[Patent Document 1]

Japanese Patent No. 4073745

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2007-40566

However, in the above conventional hot water heater, it is common to use hot water in the storage tank at the time of bathtub hot water supply (for example, receiving hot water in the bathtub). In such a hot water heater, there is a problem that it takes time for the hot tub water supply due to the hydraulic pressure.

Then, this invention makes it a subject to provide the hot water supply machine which can perform bathtub hot water supply in a short time.

The hot water heater according to the present invention draws out and heats a storage tank for storing refrigerant liquid, a general hot water circuit for supplying hot water to a general tapping terminal, a hot water bath circuit for supplying hot water to a bath, and a bath water stored in the bath. The tub water circulation circuit to return to the bathtub, the heating circuit for general hot water supply to heat the water supplied to the terminal by heat exchange with the refrigerant liquid, the heating circuit for the bathtub to heat the bath water with the refrigerant liquid, and the general hot water circuit The hot water supply heat exchanger for heat-exchanging the flowing water and the refrigerant liquid flowing through the heating circuit for hot water supply, and the bath heat exchanger for heat-exchanging the coolant liquid flowing through the water and the heating circuit for the bathtub, the bathtub hot water supply circuit, Connected to the water supply source, and provided so as to join the bath water circulation circuit at the front end of the heat exchanger for the bath, the water used for the bath hot water supply is the water supply source. At the same time as being supplied from, characterized in that configured to be heated by the heat exchanger for the bath.

According to the present invention, the hot water supply of the bath can be directly performed using water from the water supply source 70 even without tapping from the storage tank. Therefore, a hot water supply can be completed in a short time by high water pressure.

≪ First Embodiment >

The hot water heater according to the first embodiment of the present invention will be described.

As shown in FIG. 1, the hot water supply machine which concerns on 1st Embodiment is provided with the heat source 55 and the storage tank 1 which stores the refrigerant liquid heated by the said heat source 55. As shown in FIG. In addition, this hot water heater can be largely classified into a heat source 55 and a tank unit 50. Moreover, this hot water heater is a general hot water supply circuit C1 for supplying hot water to the general tapping terminal 60, a bath hot water supply circuit C2 for supplying hot water to the bath 65, and a bath stored in the bath 65. Bath water circulation circuit C3 which draws out water and returns it to the bath 65 is provided.

In addition, the hot water heater is a heating circuit which draws out the coolant liquid from the storage tank 1 and heat-exchanges it with the heating object (that is, water and tub water supplied to the general tapping terminal 60) and returns it to the storage tank 1. Equipped. The heating circuit is provided in plural in correspondence with the general hot water supply and the bathtub, and specifically, a general hot water heating circuit C4 for heat-exchanging the water supplied to the general hot water supply terminal 60 with the refrigerant liquid, Bath tub heating circuit (C5) for heat-exchanging the bath water with the refrigerant liquid is provided.

The hot water heater includes a general hot water heat exchanger (2) for exchanging heat flowing through the general hot water circuit (C1) and the refrigerant liquid flowing through the general hot water heating circuit (C4), and the water supplied to the bathtub and the bath heating. The bathtub heat exchanger 3 which heat-exchanges the refrigerant liquid flowing through the circuit C5 is provided. That is, the general hot water supply heat exchanger 2 is provided in the heating circuit C4 for general hot water supply, and the heat exchanger 3 for bath is provided in the heating circuit C5 for bathtub.

The heat exchanger 2 for hot water supply and the heat exchanger 3 for a bath are provided in parallel. In addition, the heat exchanger 2 for a hot water supply and the heat exchanger 3 for a bathtub are arrange | positioned outside the storage tank 1. That is, the general hot water heat exchanger 2 and the bath heat exchanger 3 are formed outside the general hot water circuit C1, the bath hot water circuit C2, the bath water circulation circuit C3, and the storage tank 1. Heat exchange. In this way, by arranging each of the heat exchangers 2 and 3 outside the storage tank 1, only the exchangers 2 and 3 need to be replaced during an accident such as clogging.

As the heat source 55, a heat pump unit is used. That is, this hot water heater takes out the refrigerant liquid in the storage tank 1 from the lower part of the storage tank 1, heats it with the heat pump unit, and returns to the upper part of the storage tank 1, The refrigerant liquid heating circuit C6. Equipped with. More specifically, as the heat source 55, a CO ₂ refrigerant is used. However, the heat source 55 and the kind of refrigerant used may be other than this, for example, the heater arrange | positioned below the storage tank 1 may be sufficient.

Moreover, this hot water heater is a characteristic structure, The bathtub hot water supply circuit C2 is connected to the water supply source 70, and is joined with the bathtub water circulation circuit C3 at the front end of the bathtub heat exchanger 3. As shown in FIG. The water used for the bathtub hot water is configured to be heated by the heat exchanger for the bath while being supplied from the water supply source 70. Specifically, the general hot water supply circuit C1 and the bathtub hot water supply circuit C2 are connected to the same water supply source 70, and the bathtub hot water supply circuit C2 is a front end of the heat exchanger 2 for general hot water supply. In the normal hot water supply circuit (C1) is installed.

The refrigerant liquid is configured to return to the storage tank 1 after being drawn out from the storage tank 1 and heat exchanged, and is used as a circulating liquid that is not supplied to the outside. That is, the refrigerant liquid is circulated in the storage tank 1, the heating circuit C4 for general hot water supply, the heating circuit C5 for the bathtub, and the refrigerant liquid heating circuit C6, and is not drawn out to the outside. It is called a closed circuit.

As the coolant liquid (which must be interpreted to mean a substance which functions as a heat medium used for heat exchange in a broad sense), water is used. In addition, since this water functions as a heat medium normally used only for heat exchange, it is represented with refrigerant liquid. However, since the refrigerant liquid is not supplied to the outside, other than water may be used, for example, an antifreeze liquid or the like may be used.

The general hot water supply circuit C1 and the bathtub hot water supply circuit C2 are connected to the water supply source 70. As a water supply source, it is preferable that water can be supplied by high water pressure, for example, pumping water from a tap or a well with a pump etc. can be used. That is, in addition to tap water, various things, such as well water, can be used as water supplied to the general tapping terminal 60 and the bathtub 65 by this water heater.

In addition, the general tapping terminal 60, which is supplied with hot water by the general hot water supply circuit C1, is intended to use a facility of a usage mode for completing the supplied hot water once. Specifically, as the general tapping terminal 60, a faucet, a shower, or the like installed in a kitchen, a washroom, a bath, or the like can be considered. On the other hand, the bath 65 is not intended to be completed by using the supplied hot water once, but is intended to be a facility of a usage mode in which it is stored and heated again later.

Next, each of the circuits C1 to C6 will be described.

The general hot water supply circuit (C1) includes a water supply pipe (T1) connected to the water supply source (70), a transfer pipe (T2) to a general hot water heat exchanger (2), a general hot water heat exchanger (2), and a general It consists of a transfer pipe (T3) to the tapping terminal 60. The bath water circulation circuit C3 includes a bath water outlet pipe T4 for taking out the bath water from the bath 65, a transfer pipe T5 to the bath heat exchanger 3, and a bath heat exchanger 3. And a transfer pipe T6 to the bath 65. The bath hot water supply circuit C2 includes a water supply pipe T1, a bath hot water supply pipe T7, a transfer pipe T5 to the bath heat exchanger 3, a bath heat exchanger 3, and a bath ( 65 to a conveying pipe (T6).

Further, the water supply pipe T1 branches into the transfer pipe T2 to the general water supply heat exchanger 2 and the tub water supply pipe T7 at the front end of the general water supply heat exchanger 2. This is called the branch point P1. The tub hot water supply pipe T7 joins the tub water take-out pipe T4 at the front end of the tub heat exchanger 3. This is called the joining point P2.

In the general hot water supply circuit C1, a water supply temperature detection unit 20 that detects the temperature (water supply temperature) of the water before heat exchange is provided at the front end of the general hot water heat exchanger 2. Specifically, the water supply temperature detection unit 20 is disposed at the front end of the branch point P1. That is, the water supply temperature detection unit 20 is provided in the water supply pipe T1. Moreover, by being arrange | positioned at such a position, the water supply temperature detection part 20 detects the temperature of the water introduce | transduced into the normal hot water heat exchanger 2, and introduces it into the heat exchanger 3 for bathtubs for hot water supply of a bathtub. It is also to detect the temperature of the water. Moreover, the general hot water supply temperature detection part 21 which detects the temperature (hot water supply temperature) of the hot water which passed (passed) through the general hot water heat exchanger 2 is provided in the rear end of the heat exchanger 2 for general hot water supply. The general hot water temperature detection unit 21 is provided in the transfer pipe T3 to the general hot water supply terminal 60.

In addition, the rear end of the general hot water heat exchanger 2 detects the flow of hot water (that is, the flow of hot water supplied to the general tapping terminal 60 such as a faucet) via the general hot water heat exchanger 2. Hot water flow detection unit 25 is provided. The hot water supply detection unit 25 is provided in the transfer pipe T3 to the general tapping terminal 60. Specifically, the hot water supply flow detector 25 detects the flow rate of the hot water (that is, the flow rate of the hot water supplied to the general tapping terminal 60) via the heat exchanger 2 for general hot water supply.

Further, in the general hot water supply circuit C1, a strainer and a check valve (both not shown) are provided at the front end of the general hot water heat exchanger 2, and the accumulator (at the rear end of the general hot water heat exchanger 2). Not shown) is provided. On the other hand, since this hot water heater is a so-called direct pressure type of water supply utilizing the water pressure from the water supply source, a pressure reducing valve is not provided.

The bathtub heat exchanger 3 is provided in the bathtub hot water supply circuit C2, and the tub water which detects the temperature (temperature of the bathtub) of the water introduced from the bathtub 65 at the front end of the bathtub heat exchanger 3. The temperature detection part 22 is provided. The bath water temperature detection unit 22 is provided in the bath water lead-out pipe T4. Specifically, the bath water temperature detection unit 22 is disposed at the front end of the confluence point P2. Moreover, the tub supply temperature detection part 23 which detects the temperature of the hot water which passed the bathtub heat exchanger 3 is provided in the rear end of the bathtub heat exchanger 3. The bath supply temperature detection unit 23 is provided in the transfer pipe T6 to the bath 65.

The tub water circulation circuit C3 is provided with a tub pump 6 for circulating the tub water through the tub heat exchanger 3. Specifically, the bath pump 6 is disposed at the front end of the bath heat exchanger 3. More specifically, the bath pump 6 is provided in the bath water lead-out pipe T4. More specifically, the bath pump 6 is provided at the front end than the confluence point P2 in the bath water circulation circuit C3.

In addition, the tub water circulation circuit C3 is provided with a check valve 33 for preventing the tub water drawn out from the tub 65 from flowing back. Specifically, the check valve 33 is disposed at the rear end of the bath pump 6 and in front of the confluence point P2. Moreover, the water flow switch and the water level detection part (not shown) of the bathtub are provided in the bathtub water extraction piping T4.

The bathtub hot water supply circuit C2 shares the upstream part with the general hot water supply circuit C1, and installs the downstream part with the bathtub water circulation circuit C3. Specifically, the bathtub hot water supply circuit C2 shares the branch point P1 of the pipes to the general hot water heat exchanger 2 with the hot water circuit, and also the confluence point P2 of the pipes to the bathtub heat exchanger 3. ) Is shared with the bath water circulation circuit (C3), and the tub hot water supply pipe (T7) is dedicated to the tub hot water circuit (C2).

The bathtub hot water supply circuit C2 is provided with a valve for a hot water bath 8. The bathtub hot water supply valve 8 is provided in a portion (that is, the tub hot water supply pipe T7) from the branch point P1 to the confluence point P2 in the bathtub hot water circuit C2. As the valve 8 for bathtub hot water supply, a solenoid valve is used. In addition, the bathtub hot water supply circuit C2 is provided with a flow rate detection unit 26 for bathtub hot water. The bathtub hot water flow detection unit 26 is provided at the rear end of the tub hot water valve 8.

Moreover, the bathtub hot water supply circuit C2 is provided with the check valve 32 which prevents the water sent to the normal hot water circuit C1 side from flowing back to the bathtub water circulation circuit C3 side. Specifically, the check valve 32 is provided in the portion (that is, the tub hot water supply pipe T7) that extends from the branch point P1 to the confluence point P2 in the bath hot water circuit C2. More specifically, it is arrange | positioned at the rear end of the flow volume detection part 26 for bathtub hot water supply. That is, the flow volume detection part 26 for bathtub hot water supply is arrange | positioned between the valve | bulb hot water supply valve 8 and the check valve 32. As shown in FIG. Moreover, a backflow drainage device (not shown) is provided in the tub hot water supply pipe T7.

The heating circuit C4 for a hot water supply and the heating circuit C5 for a bathtub are partially overlapped. That is, in the hot water supply heating circuit C4 and the heating circuit C5 for the bathtub, the withdrawal part from the storage tank 1 and the return part to the storage tank 1 are shared, and at the branch point P3 provided on the way. It branches and also joins at confluence point P4.

That is, the heating circuit C4 for normal hot water supply includes a high temperature refrigerant liquid withdrawal pipe T18, a refrigerant liquid transfer pipe T8 to the general hot water heat exchanger 2, a general hot water heat exchanger 2, It consists of the refrigerant liquid return pipe T9 from the heat exchanger 2 for general hot water supply, and the transfer pipe T10 to the storage tank 1.

The bath heating circuit C5 includes a high temperature refrigerant liquid drawing pipe T18, a refrigerant liquid conveying pipe T11 to the bath heat exchanger 3, a bath heat exchanger 3, and a bath heat exchanger. The refrigerant liquid return pipe T12 from the machine 3 and the transfer pipe T10 to the storage tank 1 are constituted.

Specifically, in the heating circuit C4 for general hot water supply, a refrigerant liquid pump 4 for circulating the refrigerant liquid to the heat exchanger 2 for general hot water supply is provided. Specifically, the refrigerant liquid pump 4 is disposed at the rear end of the heat exchanger 2 for general hot water supply. More specifically, the coolant liquid pump 4 is disposed in the coolant liquid return pipe T9 from the general hot water heat exchanger 2. The heating circuit C4 for general hot water supply is provided with a check valve 30 for preventing backflow of the refrigerant liquid drawn out from the storage tank 1. Specifically, the check valve 30 is arrange | positioned at the rear end of the heat exchanger 2 for general hot water supply. More specifically, the check valve 30 is arranged in the refrigerant liquid return pipe T9 from the general hot water heat exchanger 2. More specifically, it is arrange | positioned at the rear end of the refrigerant liquid pump 4.

Moreover, the refrigerant | coolant liquid pump 5 for distributing refrigerant liquid to the bathtub heat exchanger 3 is provided in the bathtub heating circuit C5. Specifically, the refrigerant liquid pump 5 is disposed at the rear end of the heat exchanger 3 for a bath. More specifically, the refrigerant liquid pump 5 is disposed in the refrigerant liquid return pipe T12 from the bath heat exchanger 3. In addition, a check valve 31 is provided in the heating circuit C5 for the bathtub so as not to flow back the refrigerant liquid drawn out from the storage tank 1. Specifically, the check valve 31 is disposed at the rear end of the bath heat exchanger 3. More specifically, the check valve 31 is disposed in the refrigerant liquid return pipe T12 from the bath heat exchanger 3. More specifically, it is arrange | positioned at the rear end of the refrigerant liquid pump 5.

By the way, the said refrigerant liquid pumps 4 and 5 are rotation speed-controlled so that the quantity of refrigerant liquid which may pass (that is, heat-exchange) through each heat exchanger 2 and 3 may be adjusted. Such control is performed by the control unit 40.

As described above, the heating circuit C4 for the hot water supply and the heating circuit C5 for the bath are partially shared, and specifically, the hot refrigerant liquid withdrawal pipe T18 branches at the branch point P3. The refrigerant liquid transfer pipe T8 to the general hot water heat exchanger 2 and the refrigerant liquid transfer pipe T11 to the bath heat exchanger 3 are formed. In addition, the refrigerant liquid return pipe T9 from the general hot water heat exchanger 2 and the refrigerant liquid return pipe T12 from the bath heat exchanger 3 join at the confluence point P4 to the storage tank 1. It becomes a feed pipe T10.

In addition, the water heater is provided with a supply circuit C7 for supplying to the storage tank 1 assuming the case where the filtered water is used as the refrigerant liquid. Specifically, the replenishment circuit C7 is provided to replenish the storage tank 1 with the water source water from the water supply source 70. The replenishment valve 9 is provided in the replenishment circuit C7. In addition, the supply valve 9 is normally closed. As the replenishment valve 9, a solenoid valve is used. In the case where the filtered water is used as the refrigerant liquid, the supply valve 9 may be controlled automatically so that the supply may be performed.

Specifically, the replenishment circuit C7 is constituted by the replenishment pipe T13 connected to the upper portion of the storage tank 1. More specifically, the replenishment pipe T13 is connected to the water supply pipe T1. More specifically, the replenishment pipe T13 is branched from the branch point P1 to the transfer pipe T2 to the general hot water heat exchanger 2 and the tub hot water pipe T7. That is, the water supply pipe T1 branches at the branch point P1 into the transfer pipe T2 to the general hot water heat exchanger 2, the tub hot water supply pipe T7, and the replenishment water pipe T13.

Moreover, this hot water heater is provided with the refrigerant | coolant liquid discharge | release part which discharges (or discharges) refrigerant liquid to the exterior of the storage tank 1 at the time of the pressure rise in the storage tank 1. As a case where the pressure in the storage tank 1 rises, the case where water is heated and volume expands is considered. Specifically, the coolant liquid discharge unit is configured by the reserve tank 12 provided above the storage tank 1. More specifically, the reserve tank 12 is provided in the replenishment circuit C7 (that is, the replenishment pipe T13).

The coolant liquid heating circuit C6 is configured to include a return path toward the heat source 55 and a return path from the heat source 55. Specifically, the path toward the heat source 55 is constituted by the low temperature refrigerant liquid withdrawal pipe T14 from the storage tank 1 and the transfer pipe T15 to the heat source 55. The return path is constituted by the high temperature refrigerant liquid return pipe T16. The low temperature refrigerant liquid drawing pipe T14 is connected to the lower portion of the storage tank 1. In addition, the low temperature refrigerant liquid drawing pipe T14 branches into the transfer pipe T15 from the front end of the heat source 55 to the heat source 55 and the discharge pipe T17 described later. In addition, a three-way valve 7 is provided between the return path and the return path, and the three-way valve 7 functions as a freezing prevention valve.

In addition, the water heater is provided with a discharge path C8 for discharging the refrigerant liquid in the storage tank 1 to the outside. Specifically, the discharge path C8 shares the upstream portion with the refrigerant liquid heating circuit C6. Specifically, the discharge path C8 is constituted by the low temperature refrigerant liquid withdrawal pipe T14 and the discharge pipe T17 from the storage tank 1. Moreover, the discharge path C8 is provided with the discharge valve 10 which prevents the refrigerant liquid in the storage tank 1 from flowing out to normal. Specifically, the discharge valve 10 is disposed in the discharge pipe T17.

The storage tank 1 is provided with a plurality of storage tank temperature detectors 15 to 19 that detect the temperature of the coolant liquid at different height positions. Specifically, five storage tank temperature detection parts 15-19 are provided in the storage tank 1 from the upper part to the lower part.

In addition, the hot water heater is provided with a control unit 40 for controlling the pumps 4 to 6 and the valves 7 to 9 on the basis of the detection results of the detection units 15 to 23, 25 and 26 described above. have. In addition, the hot water heater is provided with an operation unit for starting operation of the hot water heater, setting various operating conditions such as hot water temperature and bathtub temperature, and the like. Specifically, a bath water remote control 41 and a kitchen remote control 42 are provided as an operation unit. And the control part 40 controls each pump 4-6 or each valve 7-9 so that the content operated by the said operation part may be implemented. In addition, although the sensors, such as a thermistor, are used as said each temperature detection part 15-20, 21, 22, 23, for example, it is not limited to this.

Next, a general hot water mode, a hot water bath mode, and a bath water heating circulation mode (so-called reheating of bath tub water mode) realized by the above water heater will be described in order.

First, the general hot water mode will be described with reference to FIG. 2. In the normal hot water supply mode, operation is started by detecting the flow in the hot water supply circuit C1 in the hot water supply flow detector 25. That is, when the general tapping terminal 60 (faucet or the like) is opened, the flow in the hot water supply circuit C1 is detected by the hot water supply flow detector 25. Then, the heating circuit C4 for normal hot water supply is driven so that hot water of the set hot water supply temperature is supplied to the general hot water supply terminal 60. Specifically, based on the water supply temperature detected by the water supply temperature detection unit 20 and the flow rate detected by the hot water supply flow detection unit 25, the temperature detected by the general hot water supply temperature detection unit 21 becomes a target temperature. The refrigerant liquid pump 4 (more specifically, rotation speed) of the heating circuit C4 is controlled. When the hot water supply detection unit 25 detects that the general tapping terminal 60 is closed, the coolant liquid pump 4 is stopped and controlled.

In addition, the target temperature is set higher than the set temperature in consideration of the temperature drop between the hot water from the hot water supply temperature detection unit 21 to the general hot water supply terminal 60. However, it is not limited to this, The target temperature may be equal to the set temperature. By the way, when the operation mode of a hot water heater is a normal hot water supply mode, the valve | bulb hot water supply valve 8 is in the closed state.

Next, a bathtub hot water supply mode is demonstrated using FIG. The operation of the bathtub hot water supply mode is started based on the operation of the operation unit. That is, when the operation unit is operated, the bath heating circuit C5 is driven so that the hot water at the temperature of the hot water received in the set bath is supplied to the bath. In addition, the bathtub hot water supply valve 8 is in an open state. Specifically, based on the water supply temperature detected by the water supply temperature detection unit 20 and the flow rate detected by the flow rate detection unit 26 for the hot water supply of the bath, the temperature detected by the bath supply temperature detection unit 23 becomes the target temperature. The refrigerant liquid pump 5 (more specifically, the rotation speed) of the heating circuit C5 is controlled. Then, for example, when the receiving of the hot water in the bathtub is completed by the injection of a predetermined amount of hot water or the like, the refrigerant liquid pump 5 is stopped and controlled.

In addition, in the bathtub hot water supply mode, in addition to receiving hot water in the bath, a hot water supplement for adding hot water equal to the set temperature, and hot water for adding a hot water of a temperature higher than the set temperature to increase the temperature of the bath 65, further supplying water. It includes various types of hot water supply to heat the water from the hot water supply bath. In addition, as shown in FIG. 5, in the case of the water pouring which adds water and lowers the temperature of a bathtub, the bathtub heating circuit C5 is not driven, but the bathtub hot water supply circuit C2 is used. However, in the case of further pouring, the water may be directly supplied to the tub 65 by, for example, a water supply pipe for a bathtub (not shown).

Next, the bathtub water heating circulation mode is demonstrated using FIG. The bath water heating circulation mode starts operation based on the operation at the operation unit. That is, the bath heating circuit C5 is driven so that the bath water becomes the set bath temperature. Specifically, the bath pump 6 is driven and based on the bath water temperature detected by the bath water temperature detection unit 22 until the temperature detected by the bath supply temperature detection unit 23 becomes the target temperature. The refrigerant liquid pump 5 (more specifically, the rotational speed) of the heating circuit C5 for the bathtub is driven while being controlled. When the reheating of the bath water is finished by the temperature detected by the bath supply temperature detecting unit 23 being the target temperature or the like, the coolant liquid pump 5 is stopped and controlled.

In addition, in the bath hot water supply mode and the bath water heating circulation mode, the target temperature is the same as in the hot water supply mode, taking into account the difference between the temperature detected by the bath supply temperature detection unit 23 and the temperature in the bath. It is set higher than the set temperature. However, it is not limited to this and the target temperature may be the same as the set temperature.

As described above, according to the hot water supply machine according to the present embodiment, hot water is supplied directly from the water supply source 70 using the water supply from the water supply source 70 (that is, the water supply from the water supply pipe T1) without being hot watered from the storage tank 1. Can be done. Therefore, a hot water supply can be completed in a short time by high water pressure. In addition, it is not necessary to make the tapping from the storage tank 1 at the time of hot water supply of a bathtub. For this reason, for example, there exists an advantage that the refrigerant liquid in the storage tank 1 can be used effectively. In addition, since there is no need to provide a pipe for drawing hot water from the storage tank 1 separately, there is an advantage that the structure of the hot water heater can be simplified.

Moreover, the said hot water supply circuit C1 and the bathtub hot water supply circuit C2 are connected to the same water supply source 70, and the said bathtub hot water supply circuit C2 is common at the front end of the said heat exchanger 2 for ordinary hot water supply. It is provided to branch from the hot water supply circuit C1. With such a configuration, the water supply pipe T1 from the water supply source 70 can be shared by the general hot water supply circuit C1 and the bathtub hot water supply circuit C2, and the structure of the hot water heater can be simplified.

However, according to the above configuration, since the water supplied from the water supply source 70 can be directly heated and tapped, the water supplied from the water supply source 70 is once stored in the storage tank 1 or the heat source 55. It is not necessary to hot water the general tapping terminal 60 or the bathtub 65 after heating.

Therefore, it is possible to employ a configuration in which the coolant liquid is drawn out of the storage tank 1 and heat exchanged and then returned to the storage tank 1, and used as a circulating liquid which is not supplied to the outside.

That is, the general hot water heating circuit C4, the bathtub heating circuit C5, and the refrigerant liquid heating circuit C6, through which the refrigerant liquid circulates, are constituted by a closed circuit. Therefore, the hot water heater can be operated without introducing the water supplied from the water supply source 70 into the storage tank 1 or the refrigerant liquid heating circuit C6. For this reason, a hot water heater can be used regardless of the kind of water from the water supply source 70.

Therefore, as long as it is a hot water heater which consists of the said structure, even if water (for example, well water etc.) with many contaminant which is generally unsuitable for a storage tank type hot water heater, it can be used. Examples of the contaminants include calcium and the like, and these substances may be laminated to clog pipes. Of course, water (for example, tap water or the like) subjected to filtration treatment can also be used. Moreover, since it is a closed circuit, various things can be employ | adopted according to a use as refrigerant liquid.

For example, when the refrigerant liquid is an antifreeze liquid, a storage tank type hot water heater can be used even in a cold district. In addition, when each piping T1-T3, T4-T7 which extends from the water supply source 70 to the general tapping terminal 60 and the bathtub 65 among the piping T1-T18 which comprise a water heater is made into corrosion resistance, Even if all the pipes constituting the hot water heater are not corrosion resistant, corrosive liquids such as hot spring water can be heated and heated. In addition, in these cases, since the water supplied from the water supply source 70 cannot be replenished in the storage tank 1 as it is, the structure in which the replenishment circuit C7 is not provided can be considered. However, the structure in which water quality improvement members, such as a filter, is provided in the supply circuit C7 separately may be sufficient.

Moreover, by providing the reserve tank 12, even when the refrigerant liquid in the storage tank 1 expands in volume, it can be temporarily sent out of the storage tank 1 without discarding the refrigerant liquid. The hot water heater is configured to perform heat exchange with a heating object by a general hot water heating circuit C4 provided with a general hot water heat exchanger 2 disposed outside the storage tank 1, Similarly, heat exchange with the object to be heated is performed by the bath heating circuit C5 provided with the bath heat exchanger 3. Therefore, by controlling the flow rate of the refrigerant liquid flowing through the general heating water circuit C4 or the heating circuit C5 for the hot water supply, the amount of heat exchange can be adjusted to control the hot water temperature. Therefore, for example, it is not necessary to provide a mixing valve for mixing the heat-exchanged hot water and water from the water supply source, and to adjust the mixing ratio thereof, thereby simplifying the structure and control.

≪ Second Embodiment >

Next, the hot water heater according to the second embodiment of the present invention will be described. However, about the structure common to the water heater with respect to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

The hot water heater returns the coolant liquid to another height position (or another temperature region) of the storage tank 1 in accordance with the temperature of the coolant liquid from the heat exchanger 2 for the hot water supply or the heat exchanger 3 for the bath. It is configured to be. Specifically, the transfer pipe T10 to the storage tank 1 is divided into two pipes, the refrigerant liquid return pipe T10A to the lower portion of the storage tank 1, and the refrigerant to the intermediate portion of the storage tank 1. It is comprised by the liquid return piping T10B. Moreover, this hot water heater is provided with the conversion valve 90 which changes the piping which refrigerant liquid returns according to the temperature of refrigerant liquid. The hot water heater is also provided with a temperature detector (not shown) for detecting the temperature of the refrigerant liquid returned from the heat exchanger. This temperature detection part is provided at least at the rear end of the bathtub heat exchanger 3, preferably at the rear end of the confluence point P4.

By the way, for example, when the refrigerant liquid after heat exchange is in a state where the temperature is high, it is not preferable to return to the low temperature region below the storage tank 1. As a case where the refrigerant liquid after heat exchange has a high temperature, for example, the case where the bathtub water is reheated in the state in which the bathtub water is already high temperature to some extent can be considered. In this case, since the amount of heat exchanged is small, the refrigerant liquid is returned to the storage tank 1 at a relatively high temperature.

In this regard, the hot water heater having the above-described configuration is configured to return to a different height position of the storage tank 1 depending on the temperature, so that such a disadvantage can be prevented.

In addition, the hot water heater which concerns on this invention is not limited to the structure of the said embodiment, A various change is possible within the range which does not deviate from the meaning of invention.

For example, as shown in FIG. 7, the piping related to a bathtub hot water supply can be isolate | separated easily, and it can be set as the hot water supply exclusively for general hot water as needed. Specifically, the tub hot water supply pipe T7, the refrigerant liquid transfer pipe Tl1 to the bath heat exchanger 3, and the refrigerant liquid return pipe T12 from the bath heat exchanger 3 shown in FIG. The quick-fastener piping which can be detached easily, and after removing these piping T7, T11, and T12, the structure indexed by the water stop members S1-S3 can be considered.

In each of the above embodiments, although the general hot water supply circuit C1 and the bathtub hot water supply circuit C2 are connected to the same water supply source 70, the water supply pipe is not limited to this and is connected to another water supply source. (T1) may not be shared.

In addition, when water is used as the refrigerant liquid, the medium temperature water can be taken out again from the storage tank 1, and this may be used for a general hot water supply or a hot water supply for a bathtub.

1 is a circuit diagram of a hot water heater according to a first embodiment of the present invention;

2 is a circuit diagram for explaining a normal hot water supply mode in the hot water heater according to the first embodiment of the present invention;

3 is a circuit diagram illustrating a bathtub hot water supply mode in a hot water heater according to the first embodiment of the present invention;

4 is a circuit diagram for explaining a bath water heating circulation mode in a hot water heater according to the first embodiment of the present invention.

5 is a circuit diagram illustrating a state in which water is further poured in a hot water heater according to the first embodiment of the present invention;

6 is a circuit diagram of a hot water heater according to a second embodiment of the present invention;

7 is a circuit diagram of a hot water heater according to another embodiment of the present invention.

[Description of Drawings]

1: storage tank 2: heat exchanger for general hot water supply

3: bathtub heat exchanger 4, 5: refrigerant liquid pump

6: tub pump 7: three-way valve

8: valve for hot water supply 9: valve for replenishment

10 discharge valve 12 reservoir tank

15-19: Temperature detection part in a storage tank 20: Water supply temperature detection part

21: normal hot water temperature detection unit 22: bath water temperature detection unit

23: bathtub supply temperature detection unit 25: hot water supply detection unit

26: flow rate detection unit for hot water supply bath 30, 31, 32, 33: check valve

40: control unit 41: bathtub water remote control

42: kitchen remote control 50: tank unit

55: heat source 60: general tapping terminal

65: bathtub 70: water source

C1: general hot water circuit C2: bathtub hot water circuit

C3: Bath water circulation circuit C4: Heating circuit for general hot water supply

C5: Bath heating circuit C6: Refrigerant liquid heating circuit

C7: Supply Circuit C8: Discharge Path

T1: water supply pipe

T2: Transfer piping to general heat exchanger

T3: Transfer piping to general tapping terminal

T4: Tub withdrawal pipe

T5: Transfer piping to the bath heat exchanger

T6: Transfer piping to bathtub T7: Tubing for hot water supply

T8: Transfer of refrigerant liquid to general heat exchanger

T9: Refrigerant liquid return piping from general hot water heat exchanger

T10: Transfer piping to storage tank

T10A: Refrigerant liquid return piping to the bottom of the storage tank

T10B: Refrigerant liquid return piping to middle part of storage tank

T11: Refrigerant liquid transfer piping to bathtub heat exchanger

T12: Refrigerant liquid return piping from the bath heat exchanger

T13: Supply pipe T14: Low temperature refrigerant liquid drawing pipe

T15: Transfer piping to heat source T16: High temperature refrigerant liquid return piping

T17: discharge pipe T18: high temperature refrigerant liquid withdrawal pipe

P1, P3: branch point P2, P4: confluence point

S1 to S3: Index member

Claims (3)

A storage tank for storing refrigerant liquid, A general hot water circuit for supplying hot water to a general hot water supply terminal, A bathtub hot water circuit to supply hot water to the bathtub, A tub water circulation circuit which draws and heats the tub water stored in the bath and returns it to the bath, A heating circuit for general hot water supply, which heats water supplied to a general tapping terminal by heat exchange with a refrigerant liquid, A heating circuit for a bath for heating the tub water by heat exchange with a refrigerant liquid; A general hot water heat exchanger for exchanging heat flowing through a general hot water circuit and a refrigerant liquid flowing through a general hot water heating circuit, A bath heat exchanger configured to exchange heat between the water supplied to the bath and the refrigerant liquid flowing through the bath heating circuit, The bathtub hot water supply circuit is connected to the water supply source, and is provided to join the tub water circulation circuit at the front end of the tub heat exchanger. The water heater used for the hot water supply of the bath is configured to be heated by the heat exchanger for the bath while being supplied from the water supply source. The method of claim 1, The said hot water supply circuit and the bathtub hot water supply circuit are connected to the same water supply source, The hot water heater is provided so as to branch from the hot water circuit at the front end of the heat exchanger for hot water. The method according to claim 1 or 2, The refrigerant liquid is configured to return to the storage tank after being taken out of the storage tank and heat exchanged, and is used as a circulating liquid which is not supplied to the outside.

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