JP4711129B2 - Liquid heating device - Google Patents

Description

  The present invention relates to a liquid heating apparatus, and particularly relates to an apparatus having a feature in a heating water heating system.

Conventionally, a liquid heating apparatus as disclosed in Patent Document 1 below has been provided. Many of the liquid heating devices of this type have a storage tank capable of storing liquid such as hot water or a heat medium, and heating means capable of heating the liquid in the storage tank, and the liquid stored in the storage tank It is set as the structure which can supply thermal energy to load terminals, such as a heating apparatus, via the. Further, in the conventional liquid heating apparatus as described above, a heat exchanger for heating clean water is disposed in the storage tank, and is supplied to the heat exchanger by heat exchange with the liquid in the storage tank. It is configured to be able to heat and supply clean water.
JP 2001-235231 A

  In the liquid heating apparatus as disclosed in Patent Document 1, there is a problem that the volume of the storage tank becomes large as the heat exchanger must be arranged in the storage tank. Therefore, the liquid heating device of the prior art has a problem that the device configuration becomes large.

  Moreover, when the storage tank is enlarged as described above, the amount of liquid stored in the storage tank increases. For this reason, the conventional liquid heating apparatus has a problem that a large amount of liquid stored in the storage tank must be adjusted to a predetermined temperature when heating the water, and the heat energy cannot be effectively used. It was.

  Accordingly, an object of the present invention is to provide a liquid heating apparatus having a compact apparatus configuration and capable of effectively using thermal energy.

  The invention according to claim 1, which is provided to solve the above-described problem, has a housing and can store the liquid in the housing from below, above or from the side of the storing device. A heating means capable of heating the liquid in the means, a heat exchange means, a primary flow path capable of supplying the heat exchange means with the liquid stored in the storage means, and a secondary flow path through which clean water flows. The heat exchange means is disposed at a position spaced downward from the storage means, and the clean water flowing through the secondary flow path is supplied from the storage means via the primary flow path. The liquid heating apparatus is capable of being heated by heat exchange with a liquid.

  In the liquid heating apparatus of the present invention, the heat exchanging means for heating the clean water is disposed at a position separated from the storage means. Therefore, the capacity | capacitance and height of a storage means can be suppressed compared with the case where the heat exchange means for heating clean water is arrange | positioned in a storage means like the above-mentioned liquid heating apparatus of the prior art. Therefore, according to the present invention, a liquid heating apparatus having a compact apparatus configuration can be provided.

  The liquid heating apparatus of the present invention is configured to supply the liquid taken out from the storage means via the primary flow path to the heat exchange means and heat the clean water by heat exchange with this liquid. Therefore, in the liquid heating apparatus of the present invention, the amount of liquid supplied from the storage means to the heat exchange means for heating (heat exchange) of the clean water is a part of the liquid stored in the storage means. Therefore, in the liquid heating apparatus of the present invention, it is sufficient that even the liquid supplied from the storage means to the heat exchange means when the clean water is heated reaches a predetermined temperature, and the liquid stored in the storage means is not necessarily required. The whole does not have to be adjusted to a predetermined temperature. Therefore, according to the liquid heating apparatus of the present invention, the amount of heat energy required for heating the clean water can be minimized.

  Further, as described above, in the liquid heating apparatus of the present invention, the amount of liquid supplied from the storage means to the heat exchange means for heating the clean water is a part of the liquid stored in the storage means. . Therefore, in the liquid heating apparatus of the present invention, temperature unevenness or the like of the liquid used for heat exchange by the heat exchange means is unlikely to occur. Therefore, according to the liquid heating device of the present invention, it is possible to stabilize the tap water temperature of the tap water almost without being influenced by the temperature unevenness of the liquid stored in the storage means.

  Furthermore, in the liquid heating apparatus of the present invention, it is only necessary to send a part of the liquid stored in the storage means to the heat exchange means when heating the clean water, so that the entire liquid in the storage means reaches a predetermined temperature. The water can be heated without waiting. Therefore, the liquid heating device of the present invention has a time (rise time) required for supplying the clean water heated to a predetermined temperature after starting the supply operation of clean water to the conventional liquid heating device. It can be greatly shortened.

  The liquid heating apparatus of the present invention has a configuration in which a storage unit, a heating unit, a heat exchange unit, a primary channel, and a secondary channel are accommodated in a housing. Therefore, the liquid heating device of the present invention has little loss of heat energy due to taking out the liquid from the storage means via the primary flow path, or heat-exchange heating the clean water in the heat exchange means using this liquid. .

  Here, in the liquid heating apparatus of the present invention, since the heating unit can heat the liquid in the storage unit from below, above or from the side of the storage unit, the liquid in the storage unit is operated by operating the heating unit. When heated, the liquid convects in the storage means, and the liquid on the upper side of the storage means tends to be hotter than the liquid on the lower side. Therefore, in the liquid heating apparatus of the present invention, if the heat exchanging means provided for heating the clean water is at the same height as the storage means, or the liquid heating apparatus is arranged above this, the primary flow There is a possibility that thermal energy is transmitted from the upper side of the storage means to the heat exchange means via a path or the like. If such a situation occurs at the time of stopping the supply of clean water, the clean water staying in the heat exchange means will be heated, and there is a possibility that high-temperature clean water will be supplied immediately after the start of the supply of the next clean water There is.

  Therefore, based on such knowledge, in the liquid heating apparatus of the present invention, the heat exchange means is disposed below the storage means. Therefore, in the heating device of the present invention, almost no heat transfer from the storage means to the heat exchanging means occurs, and the fresh water staying in the heat exchanging means when the supply of the fresh water is stopped is heated more than necessary. Problems such as high-temperature clean water being supplied immediately after the start of supply of clean water are unlikely to occur.

  In the liquid heating apparatus according to claim 1, it is desirable that the heat exchange means is constituted by a plate heat exchanger (claim 2).

  In the liquid heating apparatus of the present invention, a plate heat exchanger is employed as the heat exchange means, so that a desired heat exchange efficiency can be obtained without enlarging the heat exchange means. Therefore, according to the present invention, the space required for installing the heat exchange means in the housing can be suppressed to the minimum, and the apparatus configuration of the liquid heating apparatus can be made compact.

  Here, in the liquid heating apparatus according to the first or second aspect, it is desirable that a pressure feeding unit capable of pumping the liquid is provided in the middle of the primary flow path (Claim 3).

  According to such a configuration, the heating state of the clean water can be controlled by controlling the operation of the pumping means.

  Here, as described above, when the liquid stored in the storage unit is heated, the liquid existing on the upper side of the storage unit tends to be preferentially heated with respect to the liquid existing on the lower side. Therefore, in the liquid heating apparatus according to any one of claims 1 to 3, the primary flow path preferentially takes out the liquid present on the upper side of the storage means with respect to the liquid present on the lower side and performs heat exchange. It is desirable to be able to supply the means (claim 4).

  According to this configuration, the liquid heated to a high temperature in the storage unit can be preferentially supplied to the heat exchange unit. Therefore, according to the liquid heating apparatus of the present invention, while effectively using thermal energy, the time (rise time) required from the start of supply of clean water to the supply of clean water heated to a predetermined temperature is increased. Further shortening is possible.

  Here, in the above-described liquid heating apparatus, it is assumed that the set temperature or amount of clean water to be supplied is suddenly changed during the operation of heating and supplying clean water. Therefore, it is desirable that the above-described liquid heating apparatus has a configuration capable of stably supplying clean water even when there is a sudden change in the supply condition of clean water as described above.

  Therefore, when such a situation is assumed, it is desirable that the liquid heating device according to any one of claims 1 to 4 is provided with a flow rate adjusting means capable of adjusting the flow rate of clean water (claim). 5).

  According to such a configuration, the supply temperature of clean water can be further stabilized.

  Further, based on the same knowledge, the liquid heating device according to any one of claims 1 to 5 is provided with a mixing unit that mixes the heated water heated in the heat exchange unit and the cleaned water supplied from the outside. It is also possible to adopt a configuration (claim 6).

  Even with this configuration, the supply temperature of clean water can be stabilized.

  Here, in the case where the mixing means is provided as in the sixth aspect of the present invention, when the water is heated by the heat exchanging means arranged in the storage means as in the liquid heating device of the prior art, the heating of the water is performed. It is assumed that heat transfer occurs from the storage means side via the liquid or the like staying with the hot water supply operation stopped during the stop. If such heat transfer occurs while the heating of heating water is stopped, the drinking water staying in the mixing means will be heated to a high temperature, and immediately after starting the hot water supply operation etc. May cause problems such as being supplied.

  In order to prevent such inconvenience, the liquid heating apparatus according to the prior art is configured so that clean water cannot flow into the mixing means from the heat exchange means side while the heating of the clean water is stopped. In such a configuration, it is possible to prevent the supply of unexpectedly high temperature clean water as described above, but mixing is performed after the clean water is to be supplied in a state adjusted to a predetermined temperature. There is a problem that it is necessary to make it possible for the clean water heated in the heat exchanging means to flow into the means, and that the fresh water reaches a predetermined temperature accordingly.

  Accordingly, the invention according to claim 7, which is provided to cope with such a problem, can mix by mixing the clean water heated in the heat exchange means and flowing in the secondary flow path with clean water supplied from the outside. A mixing means is provided, and the mixing means is in a state in which clean water can flow in from the heat exchange means side while the heating of the clean water in the heat exchange means is stopped. It is a liquid heating apparatus in any one of 1-6.

  The liquid heating device of the present invention is in a state in which clean water can flow in from the heat exchange means side while heating of clean water in the heat exchange means is stopped. For this reason, in the liquid heating apparatus of the present invention, when the water supply is adjusted to a predetermined temperature and supplied next as in the above-described prior art, the mixing means is heated again by the heat exchange means. It is not necessary for the clean water to flow into the mixing means. Therefore, the liquid heating apparatus of the present invention can minimize the period of time required for the clean water to reach the predetermined temperature after the clean water is adjusted to the predetermined temperature to be supplied. it can.

  In addition, as described above, in the liquid heating apparatus of the present invention, the heating water heated by the heat exchange in the heat exchanging means separately provided outside the storage means is supplied to the mixing means. During the stoppage of the water, the temperature rise of the clean water due to heat transfer from the storage means side hardly occurs. For this reason, in the liquid heating apparatus of the present invention, even when the heating water is stopped from being heated in the heat exchanging means, even if the drinking water is allowed to flow in from the heat exchanging means side, There is no problem that unexpectedly hot water is supplied.

  Here, the liquid heating device according to any one of claims 1 to 7 is provided not only with heating of clean water flowing through the secondary flow path but also with a heated liquid existing in the storage means, for example. A flow path that can be supplied to the load terminal or a flow path that can heat (repel) hot water in the bathtub by exchanging heat with the liquid in the storage means is provided independently of the primary flow path described above. It is also possible to adopt a configuration. In such a configuration, the liquid in the storage unit itself, the liquid in the storage unit, and the liquid in the storage unit, such as the operation of supplying the liquid in the storage unit or hot water heated by the liquid to a thermal load such as a load terminal or a bathtub, For supplying heat energy to a heat load such as a load terminal or a bathtub provided outside through a liquid such as hot water heated by heat exchange of the heat (hereinafter referred to as a heat energy supply operation as required) Can be implemented.

  On the other hand, the liquid heating apparatus according to the first to seventh aspects of the present invention can heat clean water by supplying liquid from the storage means to the heat exchange means. In other words, the liquid heating device according to any one of claims 1 to 7 operates to supply the outside without heating the water by stopping the supply of the liquid from the storage unit to the heat exchange unit (hereinafter referred to as necessary). (Referred to as non-heating supply operation). Therefore, the liquid heating device according to any one of claims 1 to 7 has a configuration in which a thermal load system capable of supplying thermal energy applied via the liquid in the reservoir to an external thermal load is provided, By adopting a configuration in which the energy supply operation and the non-heating supply operation can be performed at the same time, it is assumed that the use of clean water and the use of heat load can be performed simultaneously, and the usability is further improved.

  In view of this, the invention according to claim 8 provided based on such knowledge provides heat energy to the external heat via the liquid in the storage means and / or the liquid heated by heat exchange with the liquid in the storage means. A heat load system capable of supplying a load, and a primary flow path is provided independently for the heat load system, and heat exchange with the liquid in the storage means and / or the liquid in the storage means In the state where the supply of heat from the storage means to the heat exchanging means is stopped and the heat energy supply operation for supplying heat energy to the external heat load via the liquid heated by the It is possible to perform a non-heating supply operation for supplying supplied water to the outside of the heating system through a heat exchanging means, and to be able to simultaneously perform a heat energy supply operation and a non-heating supply operation. Claims characterized by To 7 is a liquid heating apparatus according to any one of.

  In the liquid heating apparatus of the present invention, the primary flow path through which the liquid used for heating the clean water flows is independent of the heat load system, and the liquid supply to the heat exchange means and the liquid supply to the heat load Can be performed independently. Therefore, according to the above-described configuration, the heat energy supply operation and the non-heating supply operation can be performed at the same time, and a liquid heating apparatus excellent in usability can be provided.

  Here, in the liquid heating apparatus according to the first to eighth aspects, the heat exchange means is disposed outside the storage means, and the water is heated using the heat exchange means. It is also possible to adopt a configuration in which the liquid used for the application can be heated. In this case, the liquid heating apparatus according to any one of claims 1 to 8 is a liquid-liquid heat exchange capable of heating a liquid by heat exchange with the liquid stored in the storage means inside the storage means. It is possible to adopt a configuration in which means are provided.

  According to this configuration, in addition to heating the clean water, it is possible to heat the liquid to be supplied to other load terminals represented by a heating device or the like. Therefore, according to the present invention, it is possible to provide a liquid heating apparatus that can be used not only for supply of clean water as represented by hot water supply but also for other uses.

  In addition, as described above, the liquid heating device according to any one of claims 1 to 8 heats and heats the clean water supplied to the heat exchange means by supplying the liquid in the storage means to the heat exchange means. Supplying and stopping supplying the liquid in the storage means to the heat exchanging means allows the water supplied to the heat exchanging means via the secondary flow path to be heated outside the heating system in an unheated state. Can be supplied to. Therefore, the liquid heating apparatus of the present invention is configured to heat and supply the liquid heated by the liquid-liquid heat exchanging means in the storage means, and clean water supplied from the outside to the heat exchanging means in an unheated state. The supplying operation can be performed in parallel.

  ADVANTAGE OF THE INVENTION According to this invention, the apparatus structure is compact and the liquid heating apparatus which can utilize heat energy effectively can be provided.

  Next, a liquid heating apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is the liquid heating apparatus of this embodiment. As shown in FIGS. 1 and 2, the liquid heating device 1 includes a water supply system S and a heating system D, which will be described later, in addition to a main body 2, a combustion unit 3, and a silencer 4 inside a metal casing C. In addition, the constituent members of the bath system F are incorporated.

  The main body 2 is largely divided into a combustion space portion 5 and a storage portion 6 (storage means). The combustion unit 3 and the combustion space unit 5 function as a heating unit 7 that heats the heat medium stored in the storage unit 6. The main body 2 is cylindrical in shape and has a double structure. A reservoir 6 is formed inside the main body 2. More specifically, the main body 2 has an outer cylinder 8 and an inner cylinder 9, and has a structure capable of storing a heat medium therein. In particular, a heat medium chamber 12 surrounded by an upper end plate 10 and a lower end plate 11 is formed in the upper half of the main body 2.

  A plurality of combustion gas passages 13 are formed in the heat medium chamber 12. The combustion gas passage 13 is a through hole that penetrates the heat medium chamber 12 of the storage unit 6 in the axial direction. The combustion unit 3 includes a burner that burns liquid fuel such as kerosene, and a fuel injection nozzle 15 is built therein. The combustion unit 3 includes a blower 16 and is connected to the combustion space 5 located below the main body 2. The combustion space part 5 functions as a combustion chamber of the combustion part 3.

  On the other hand, a silencer 4 is provided above the main body 2. The silencer 4 has a cylindrical or rectangular parallelepiped appearance and has a labyrinth structure inside to reduce combustion noise. 1 and 2, the labyrinth structure of the silencer 4 is not shown and is omitted.

  The fuel injected from the fuel injection nozzle 15 of the combustion section 3 burns in the combustion space section 5 and generates high-temperature combustion gas and flame. The combustion gas flows through the combustion gas passage 13 in the heat medium chamber 12, passes through the silencer 4, and is then discharged to the outside. The heat medium in the heat medium chamber 12 is heated by the high-temperature combustion gas flowing through the combustion gas passage 13 to increase the temperature.

  The storage unit 6 can store antifreeze as a heat medium. In the storage unit 6, the water supply primary side forward flow path 20 (primary flow path) and the water supply primary side return flow path 21 (primary flow path) constituting the water supply system S and the heating forward flow constituting the heating system D are provided. The flow path 22 and the heating return flow path 23 are connected. In addition, a coiled heat exchanger 17 (liquid-liquid heat exchanging means) is built in the storage unit 6, and a bath going-out flow path 25 and a bath return flow path 26 constituting the bath system F are provided therein. Is connected.

  As shown in FIG. 1, the water supply system S is configured with a water heat exchanger 30 (heat exchange means) as a center, and a water supply primary flow path 20 and a water supply primary return flow path are included therein. 21 is connected to the flow path. The water heat exchanger 30 is configured by a so-called plate-type heat exchanger, and includes primary side connection ports 30a and 30b and secondary side connection ports 30c and 30d. The water heat exchanger 30 communicates between the primary side connection ports 30a and 30b and between the secondary side connection ports 30c and 30d, and the liquid flowing between the primary side connection ports 30a and 30b and the secondary side The liquid flowing between the side connection ports 30c and 30d can be heat-exchanged. The water heat exchanger 30 is provided with a large number of fins therein, and the heat exchange efficiency can be appropriately adjusted by adjusting the number of fins.

  In FIG. 1, the water heat exchanger 30 is illustrated at a position adjacent to the side of the storage unit 6 for the sake of illustration, but actually, as shown in FIG. It is provided at a position spaced downward from 6. More specifically, the water heat exchanger 30 is disposed below the main body 2 including the reservoir 6. Therefore, the liquid heating apparatus 1 has a configuration in which heat transfer from the upper end side of the storage unit 6 to the upper water primary side outgoing flow path 20, the upper water primary side return flow path 21, the upper water heat exchanger 30, and the like hardly occurs. It has become.

  The water supply primary side outgoing flow path 20 and the water supply primary side return flow path 21 connected to the storage unit 6 are respectively connected to the primary side connection ports 30 a and 30 b of the water supply heat exchanger 30. Further, a circulation pump 32 (pressure feeding means) is provided in the middle of the clean water primary return flow path 21. Therefore, by operating the circulation pump 32, the heat medium stored in the storage unit 6 is exchanged with the heat for the clean water through the clean water primary-side forward flow path 20 connected to the upper end side of the storage unit 6. It can supply to the container 30 and can return to the storage part 6 side. That is, by operating the circulation pump 32, a circulation flow of the heat medium is generated between the storage unit 6 and the heat exchanger 30 for clean water, and the heat energy of the heat medium is transferred to the heat exchanger 30 for clean water. Can be supplied.

  The water supply flow path 33 is connected to the secondary side connection port 30c of the heat exchanger 30 for water supply, and the water supply secondary side flow path 34 (secondary flow path) is connected to the secondary side connection port 30d. It is connected. The water supply flow path 33 is a flow path for supplying hot water (clean water) from an external water supply source to the liquid heating apparatus 1. A water amount sensor 36, a water temperature sensor 37, and a water supply expansion tank 38 are provided in the middle. Yes. A check valve 29 is provided upstream of the water amount sensor 36. Therefore, even if the primary side (the heat medium side) and the secondary side (the hot water side) communicate with each other due to internal destruction of the water heat exchanger 30, the heat medium is not shown upstream of the water (not shown). There is no backflow. The water supply channel 33 is branched into the branch channel 40 in the middle. The branch channel 40 is connected to a water quantity servo 41 (mixing means) described later.

  The water secondary side outgoing flow path 34 is a flow path through which hot water heated and exchanged in the water heat exchanger 30 flows, and is connected to the water amount servo 41. More specifically, the water quantity servo 41 has three connection portions 41a, 41b, and 41c, and is configured to mix hot water (liquid) flowing in from the connection portions 41a and 41b and to discharge from the connection portion 41c. ing. The water amount servo 41 is configured to be able to adjust the opening degree of the connecting portions 41a and 41b, that is, the amount of hot water that can flow in from the connecting portions 41a and 41b, thereby mixing hot water flowing in from the connecting portions 41a and 41b. The ratio can be adjusted. The opening degree of the connecting portions 41a and 41b of the water quantity servo 41 is determined based on the set temperature of hot water to be supplied, the temperature of hot water supplied from an external water supply source via the branch flow path 40 (incoming water temperature), and the like. It is adjusted according to the amount of hot water.

  The above-described water secondary side forward flow path 34 is connected to the connection portion 41 a of the water amount servo 41. A branch channel 40 branched from the water supply channel 33 is connected to the connection portion 41 b of the water amount servo 41. Therefore, in the liquid heating apparatus 1, the hot water is heated in the water heat exchanger 30 and supplied via the water secondary side outgoing flow path 34, and the heating system H is connected via the branch flow path 40. Low temperature hot water supplied from the outside is mixed by the water amount servo 41 and discharged from the connecting portion 41c.

  The water amount servo 41 is in a state where the connecting portion 41a to which the water supply secondary side outgoing flow path 34 is connected is somewhat opened during a hot water supply operation or a dropping operation described later. That is, during the hot water supply operation standby, the water amount servo 41 is maintained in an open state with respect to the water supply secondary-side forward flow path 34.

  A water flow path 35 is connected to the water quantity servo 41. The upper water flow path 35 is a flow path for supplying hot water used for hot water supply or dropping into the bathtub 60. The water flow path 35 is connected to the connection part 41 c of the water quantity servo 41 and has a water quantity adjustment valve 43 (flow rate adjustment means) and a tapping temperature sensor 45 in the middle. A hot water supply connection port 46 for connecting a pipe connected to a hot water tap 47 is provided at the end of the water supply channel 35.

  The water supply channel 35 is branched into the pouring bypass channel 50 at a position downstream of the hot water temperature sensor 45 in the hot water flow direction. The pouring bypass channel 50 is connected to a bath return channel 26 described later. The pouring bypass channel 50 is a channel for supplying hot water for dropping into the bathtub 60, and includes a pouring electromagnetic valve 51, a pouring water amount sensor 52, and check valves 53 and 54 in the middle. It has been. The pouring water amount sensor 52 detects the amount of water flowing through the pouring bypass channel 50. The pouring solenoid valve 51 is opened and closed based on a control signal for dropping operation into the bathtub 60 transmitted from a control means (not shown). The check valves 53 and 54 are provided to prevent the hot water from flowing backward from the bathtub 60 side.

  As shown in FIG. 1, the heating system D includes a heating forward flow path 22 connected to the storage unit 6 and a heating return flow path 23. The heating forward flow path 22 is connected to the top side of the storage section 6, and the heating return flow path 23 is connected to a position on the bottom side of the storage section 6. A heating tank 65 and a circulation pump 66 are provided in the middle of the heating return flow path 23. Heating connection ports 67 and 68 are provided at the ends of the heating forward flow path 22 and the heating return flow path 23, and pipes 69 and 70 connected to a load terminal 75 provided outside the liquid heating apparatus 1 are connected thereto. By connecting, the heat medium stored in the storage part 6 can be made to come and go between the load terminal 75 and the liquid heating device 1.

  The heating forward flow path 22 and the heating return flow path 23 that constitute the heating system D are independent of the above-described water supply primary side forward flow path 20 and water supply primary side return flow path 21 of the above-described water supply system S, respectively. Connected to the reservoir 6, the heat medium can be circulated independently with respect to the water supply system S. Therefore, the liquid heating apparatus 1 supplies the heat energy to the load terminal 75 by circulating the heat medium between the load terminal 75 by operating the circulation pump 66 even when the circulation pump 32 is stopped. Can do.

  The heating tank 65 is provided with an air vent valve 71 for discharging air existing in the heating system D to the outside. A bypass flow path 72 is connected to the heating tank 65. The bypass flow path 72 is a flow path provided mainly for the purpose of protecting the circulation pump 66, and is attached so as to bypass the heating tank 65 and the upper end portion of the storage unit 6. The bypass channel 72 has a smaller channel cross-sectional area and a larger channel resistance than the heating return channel 23. Therefore, when the circulation pump 66 is operated in a state in which liquid can be supplied to the load terminal 75, the heat medium sucked out from the storage unit 6 through the heating forward flow path 22 flows through the pipes 69 and 70 and the load terminal 75. The flow returns to the storage unit 6 via the heating return flow path 23. On the other hand, when the circulation pump 66 is operated in a state in which liquid cannot be supplied to the load terminal 75, the heat medium is sucked out from the storage unit 6 through the bypass flow path 72, and then passed through the heating return flow path 23 to the storage unit 6. Return.

  The bath system F is used to heat (purge) hot water in the bathtub 60 or to drop hot water into the bathtub 60. As shown in FIG. 1, the bath system F has a configuration in which a bath flow path 25 and a bath return flow path 26 are connected to a heat exchanger 17 disposed in the storage unit 6.

  The bath going-out flow path 25 and the bath returning flow path 26 constituting the bath system F are independent of the above-described water-water primary-side going-out flow path 20 and the water-water primary-side returning flow path 21 respectively. Is provided. Therefore, even when the circulation pump 32 is stopped and the heating operation of the hot water in the water supply system S is stopped, the liquid heating device 1 circulates the hot water in the bathtub 60 by operating the circulation pump 83 and stores it. Heating can be performed in a heat exchanger 17 disposed in the section 6.

  The heat exchanger 17 is arranged in the storage unit 6 and has connection ports 17 a and 17 b on the bottom side and the top side of the storage unit 6. A bath outlet channel 25 is connected to the connection port 17a provided on the bottom side of the storage unit 6, and a bath return channel 26 is connected to the connection port 17b provided on the top side. Bath connection ports 61 and 62 for connecting pipes 77 and 78 connected to the bathtub 60 are provided at the ends of the bath going-out flow path 25 and the bath return flow path 26, respectively. Further, the bath going-out flow path 25 and the bath return flow path 26 are bypassed by a bypass flow path 63.

  In the middle of the bath return channel 26, a three-way valve 80, a hot water temperature sensor 81, a water flow switch 82, a circulation pump 83, and a water level sensor 84 are provided in this order from the heat exchanger 17 side toward the upstream side in the hot water flow direction. ing. Further, the hot water supply bypass passage 50 described above is connected to a position in the middle of the bath return side passage 26 and upstream of the circulation pump 83. The three-way valve 80 is provided at the connection portion between the bypass flow path 63 and the bath return flow path 26 described above, and can be opened and closed as necessary. More specifically, when the hot water previously set in the bathtub 60 is heated (repels), the port on the heat exchanger 17 side of the three-way valve 80 and the port on the circulation pump 83 side communicate with each other. Is done. As a result, the hot water can come and go between the heat exchanger 17 and the bathtub 60. On the other hand, when hot water is supplied (dropped) into the bathtub 60, the port on the heat exchanger 17 side of the three-way valve 80 is closed. As a result, the hot water heated in the water heat exchanger 30 flows from the pouring bypass channel 50 side to the bath outlet channel 25 and the bath return channel 26 and flows into the bathtub 60 via the pipes 77 and 78. It can be supplied.

  Then, operation | movement of the liquid heating apparatus 1 of this embodiment is demonstrated. In addition to the hot water supply operation in which the liquid heating apparatus 1 supplies hot water heated and exchanged in the hot water heat exchanger 30 to the hot water tap 47, the hot water supplied from outside is not heated in the heat exchanger and heated as it is. Water supply operation to supply water, load operation to supply heat energy to the load terminal 75 through the heat medium stored in the storage unit 6, drop operation to drop hot water into the bathtub 60, follow-up to heat the hot water in the bathtub 60 One or a plurality of driving methods can be selected from the whirling operation. Hereinafter, the operation of the liquid heating apparatus 1 will be described for each operation method.

(Hot water operation)
When the liquid heating apparatus 1 performs the hot water supply operation, the hot water supplied from the external water supply source is exchanged with the high-temperature heat medium stored in the storage unit 6 in the water heat exchanger 30. It is heated and supplied toward the hot water tap 47. More specifically, in the liquid heating apparatus 1, when an operation switch (not shown) is turned on and the hot-water tap 47 is opened, low-temperature hot water is supplied from an external water supply source via the water supply passage 33. The When the water amount sensor 36 provided in the middle of the water supply passage 33 detects a water flow of a predetermined amount or more, the circulation pump 32 starts operating.

  When the circulation pump 32 is actuated, the high-temperature heat medium sucked out from the primary side connection port 30 a provided on the top side of the storage unit 6 is supplied to the water heat exchanger 30 via the water water primary side forward flow path 20. To be supplied. The high-temperature heat medium sucked out from the reservoir 6 returns to the reservoir 6 via the clean water primary-side return flow channel 21 after releasing heat energy in the clean water heat exchanger 30. That is, when the circulation pump 32 operates, the heat medium stored in the storage unit 6 circulates between the storage unit 6 and the water heat exchanger 30.

  Part of the low-temperature hot water supplied from the outside via the water supply channel 33 is supplied to the water heat exchanger 30, and the remaining part is supplied to the water amount servo 41 via the branch channel 40. Here, the flow rate ratio of the hot water supplied to the hot water heat exchanger 30 and the hot water flowing to the branch channel 40 is determined by the water amount servo 41 based on the set temperature of hot water required in the hot water tap 47. Adjusted.

  The hot water supplied to the water supply heat exchanger 30 via the water supply flow path 33 is exchanged with the high-temperature heat medium supplied to the water supply heat exchanger 30 via the water supply primary-side forward flow path 20. Heated by heat exchange. Hot hot water heated in the heat exchanger 30 for clean water is supplied to the water amount servo 41 via the clean water secondary-side forward flow path 34.

  The hot hot water supplied to the water amount servo 41 is mixed with the low temperature hot water supplied via the branch flow path 40 and adjusted to a predetermined temperature, and then flows into the water supply flow path 35. The hot water that has flowed into the water supply channel 35 is supplied to the hot-water tap 47 via the pipe 48 connected to the hot-water supply connection port 46 and used for hot water supply.

(Water supply operation)
The water supply operation is an operation mode in which hot water supplied from a water supply source outside the liquid heating apparatus 1 is supplied to the hot water tap 47 as it is without being subjected to heat exchange heating by the water heat exchanger 30. More specifically, when the water supply operation is performed, the liquid heating device 1 does not perform the hot water supply operation when an operation switch (not shown) is in an off state. That is, when the operation switch is in the OFF state, the circulation pump 32 does not operate, and the heat medium (heat energy) is not supplied from the storage unit 6 to the water heat exchanger 30. Therefore, when the hot-water tap 47 is opened in this state, the low-temperature hot water supplied from the external water supply source through the water supply flow path 33 passes through the water heat exchanger 30 and is supplied to the hot-water tap 47. Is done.

  The liquid heating apparatus 1 according to the present embodiment heats hot water (clean water) supplied from an external water supply source as in a load operation or a chasing operation regardless of whether the operation switch described above is in an on state. It is set as the structure which can implement the driving | operation not accompanied by. Therefore, the liquid heating apparatus 1 heats hot water in a state where the circulation pump 32 is in an off state and cannot supply heat medium (heat energy) from the storage unit 6 to the water heat exchanger 30. Thus, it is impossible to perform the hot water supply operation to be supplied, but the water supply operation can be performed.

(Load operation)
When the liquid heating apparatus 1 is operated under load operation, when an operation switch (not shown) is turned on, the combustion unit 3 starts the combustion operation, and the heat medium stored in the storage unit 6 is heated. In addition, the circulation pump 66 provided in the heating return flow path 23 is activated, and the heat medium in the storage unit 6 is in the circulation flow path constituted by the heating forward flow path 22, the heating return flow path 23, and the pipes 69 and 70. Circulate. Thereby, thermal energy is supplied to the load terminal 75 via a heat medium.

(Dropping operation)
The liquid heating apparatus 1 can perform a drop operation for dropping hot water into the bathtub 60 in three operation modes including a hot water filling mode, an additional hot water mode, and an additional water mode. The additional water mode is a mode in which hot water supplied from the outside is supplied to the bathtub 60 without heating, as in the above-described water supply operation. When the liquid heating apparatus 1 adds and performs the drop operation in the water mode, the circulating pump 32 does not operate because it is not necessary to heat the hot water. That is, when operating in the additional water mode, a part of the low-temperature hot water supplied from the outside passes through the water heat exchanger 30 and is supplied to the water amount servo 41 and the low-temperature water supplied from the outside is supplied. The remaining portion of the hot water flows into the water quantity servo 41 through the branch channel 40 and merges, and is dropped into the bathtub 60 through the water channel 35 and the pouring bypass channel 50.

  When the liquid heating apparatus 1 adds and performs the drop operation in the water mode, the circulation pump 32 is temporarily in a failure state in the off state, as in the above-described water supply operation, and the reservoir 6 is switched to the water heat exchanger 30. It can be carried out even in a state where a heat medium (heat energy) cannot be supplied.

  The hot water filling mode is a mode in which hot water supplied from the outside is heated in the water heat exchanger 30 and dropped into the bathtub 60, and hot water is filled in the bathtub 60. The additional hot water mode is a mode in which hot water heated in the water heat exchanger 30 is added to the bathtub 60 in a state where a certain amount of hot water is previously stored in the bathtub 60.

  When the liquid heating device 1 is operated in a drop-down operation in the hot water filling mode or the additional hot water mode, the low-temperature hot water supplied from the water supply source is heated in the hot water heat exchanger 30 and dropped into the bathtub 60. That is, when the drop operation is performed in the hot water filling mode or the additional hot water mode, hot water is supplied from an external water supply source. When the water amount sensor 36 provided in the middle of the water supply passage 33 detects a water amount of a predetermined amount or more, the circulation pump 32 starts to operate.

  On the other hand, when the liquid heating apparatus 1 performs the dropping operation in the hot water filling mode or the additional hot water mode, the three-way valve 80 provided in the middle of the bath return passage 26 is closed to the heat exchanger 17 side. In addition, the pouring electromagnetic valve 51 provided in the pouring bypass channel 50 which is a branch channel of the water supply channel 35 is opened. As a result, the hot water heated in the heat exchanger for clean water 30 is mixed with the low temperature hot water supplied via the branch flow path 40 in the water amount servo 41, and then the clean water flow path 35 and the pouring bypass flow path 50. Then, it flows into the bath return channel 26. A part of the hot water flowing into the bath return channel 26 flows into the pipe 78 as it is and dropped into the bathtub 60. Further, the remaining part of the hot water flowing into the bath return channel 26 flows into the bath going channel 25 via the bypass channel 63 and is dropped into the bathtub 60 via the pipe 77.

(Reaping driving)
The reheating operation generates a circulating flow of hot water between the coil-type heat exchanger 17 provided in the storage unit 6 and the bathtub 60, and the high-temperature heat medium stored in the storage unit 6. In this mode, hot water flowing in the heat exchanger 17 is heated by heat exchange. More specifically, when the liquid heating device 1 operates in a reheating operation, the combustion unit 3 performs the combustion operation in the same manner as in each operation described above, and the heat medium in the storage unit 6 is heated. Is done. Further, when the operation is performed in the reheating operation, the port on the heat exchanger 17 side of the three-way valve 80 provided in the middle of the bath return flow path 26 and the port on the circulation pump 83 side are in communication with each other. . When the circulation pump 83 is operated in this state, hot water in the bathtub 60 is sucked out through the pipe 78 and flows into the bath return channel 26 and flows into the heat exchanger 17. The hot water flowing into the heat exchanger 17 is heated by heat exchange with the heat medium in the storage unit 6, and returned to the bathtub 60 through the bath going flow path 25 and the pipe 77. Thereby, the hot water in the bathtub 60 is gradually heated.

  As described above, in the liquid heating apparatus 1 of the present embodiment, the hot water heat exchanger 30 provided for heating the hot water used for hot water supply or dropping is not inside the storage unit 6, It arrange | positions in the position spaced apart below with respect to the main-body part 2 containing the storage part 6. FIG. Therefore, the liquid heating apparatus 1 is higher in the storage unit 6 than the case where a heat exchanger similar to the coil-type heat exchanger 17 provided for reheating is provided for heating water as in the conventional technique. The sheath volume is small.

  The liquid heating apparatus 1 takes out the heat medium through the water primary side forward flow path 20 connected to the upper side of the storage unit 6 and supplies the heat medium to the water heat exchanger 30, and via the water supply path 33. The hot water supplied from the outside is configured to be heat exchange heated. That is, in the liquid heating device 1, a part of the heat medium stored in the storage unit 6 is taken out, and the hot water is heat exchange heated using this. Therefore, the liquid heating apparatus 1 can heat the clean water uniformly in the clean water heat exchanger 30 as long as the heat medium existing above the reservoir 6 has reached a predetermined temperature. That is, in the liquid heating device 1, the water can be heated without being affected by the temperature unevenness (temperature distribution) of the liquid stored in the storage unit 6 almost without any influence.

  Here, in the liquid heating apparatus 1 of the present embodiment, when the combustion unit 3 is operated to heat the heat medium in the storage unit 6, it is usually lower than the lower side of the storage unit 6 due to the influence of convection of the heat medium. A high-temperature heat medium tends to gather on the upper side. In the liquid heating apparatus 1 of the present embodiment, the heat medium is preferentially taken out from the upper side of the storage unit 6 and supplied to the water heat exchanger 30, and the heat medium after heat radiation is returned to the lower side of the storage unit 6. The configuration is adopted. Therefore, the liquid heating apparatus 1 efficiently uses the heat energy stored in the storage unit 6 via the heat medium for heating the hot water used for hot water supply or dropping, and consumes the heat energy required for hot water supply or dropping. It can be minimized.

  As described above, the liquid heating apparatus 1 is configured to take out a part of the heat medium existing in the storage unit 6 and supply it to the water heat exchanger 30 to heat and heat the water. Therefore, the liquid heating apparatus 1 is in a state in which clean water can be sufficiently heated when the heat medium existing above the storage unit 6 becomes high temperature. That is, the liquid heating device 1 is in a state in which hot water heated to a predetermined temperature can be supplied for hot water supply or dropping without waiting for the entire heat medium in the storage unit 6 to reach a high temperature. Therefore, the liquid heating apparatus 1 is in a state in which hot water heated to a predetermined temperature can be supplied within a short time after the hot water supply operation and the dropping operation are started.

  In the liquid heating apparatus 1 of this embodiment, the structure which accommodated the structural member and piping of the water system S, the heating system D, and the bath system F in addition to the storage part 6, the heating means 7, the heat exchanger 30 for water, etc. It is said that. Therefore, the liquid heating apparatus 1 has little heat energy loss due to heat dissipation due to the passage of the heat medium between the storage unit 6 and the water heat exchanger 30 and heat dissipation due to heat dissipation in the water heat exchanger 30.

  In the liquid heating apparatus 1 according to the present embodiment, in consideration of the fact that a high-temperature heat medium tends to collect on the upper side of the storage unit 6, the water heat exchanger 30 is disposed below the storage unit 6. ing. That is, when the water heat exchanger 30 is disposed at a height equal to or higher than that of the storage unit 6, heat transfer from the storage unit 6 side to the water heat exchanger 30 side occurs. Cheap. Therefore, when the water heat exchanger 30 is disposed at a height equal to or higher than the storage unit 6, the water heat exchanger 30 stays in the water heat exchanger 30 while the hot water supply operation or the dropping operation is stopped. Hot water may be heated more than necessary, or hot hot water may be supplied immediately after the start of the next hot water supply operation or dropping operation. In view of this situation, in the liquid heating apparatus 1 of the present embodiment, the water heat exchanger 30 is disposed below the storage unit 6, and the water supply heat exchanger 30 is disposed from the storage unit 6 side. It has a structure that prevents heat transfer. For this reason, the liquid heating device 1 is configured so that the hot water remaining in the hot water heat exchanger 30 is not retained during the hot water supply operation or dropping, that is, while the supply of clean water to the hot water heat exchanger 30 is stopped. Problems (high temperature hot water) are unlikely to occur, such as excessive temperature rise or unexpectedly hot water supplied immediately after the start of the next hot water supply operation or drop operation.

  In the said embodiment, although the structure which has arrange | positioned the heat exchanger 30 for tap water below the storage part 6 in consideration of generation | occurrence | production of malfunctions, such as high temperature hot water, it is not necessary to consider malfunctions, such as high temperature hot water. May be configured such that the water heat exchanger 30 is disposed at a height equal to or higher than the storage unit 6.

  Since the liquid heating apparatus 1 employs a plate-type heat exchanger as the water heat exchanger 30, a desired heat exchange efficiency can be obtained without enlarging the water heat exchanger 30. it can. Therefore, the liquid heating apparatus 1 requires a small space for installing the water heat exchanger 30 in the housing C, and the overall apparatus configuration is compact.

  In the said embodiment, although the example which employ | adopted what is called a plate-type heat exchanger as the heat exchanger 30 for clean water was illustrated, this invention is not limited to this, Other types of heat exchangers are used. It may be adopted.

  As described above, the liquid heating apparatus 1 is provided with the circulation pump 32 in the middle of the water supply primary return flow path 21 and operates the heat pump between the heat exchanger 30 for water supply and the storage unit 6. Can be circulated. Therefore, the liquid heating apparatus 1 can control the heating state of clean water used for hot water supply or dropping by controlling the operation of the circulation pump 32.

  The liquid heating apparatus 1 has a water amount servo 41, and after supplying hot water heated in the hot water heat exchanger 30 and low temperature hot water supplied from the outside to the water heating device 41 and mixing them, Via the hot water tap 47, hot water can be supplied. Further, the liquid heating apparatus 1 is provided with a water amount adjustment valve 43 in the middle of the upper water flow path 35. Therefore, in the liquid heating apparatus 1 of the present embodiment, heat dissipation or the like occurs in the middle of the clean water primary-side forward flow path 20, the clean water primary-side return flow path 21, the clean water secondary-side forward flow path 34, or the like. However, it is possible to accurately adjust the temperature of clean water supplied for hot water supply or dropping.

  Further, since the liquid heating device 1 is provided with the water amount servo 41 and the water amount adjusting valve 43, the set temperature St of the hot water supply is suddenly changed by the operation of the remote controller 91 during the hot water supply operation, or the operation of the hot water tap 47 is performed. Thus, even if the hot water (water supply) supply conditions are changed abruptly, such as when the hot water supply flow rate is changed abruptly, the hot water supply operation can be performed at a stable hot water temperature.

  In the said embodiment, although the structure which stabilizes the supply temperature of clean water by providing the water quantity servo 41 and the water quantity adjustment valve 43 was illustrated, this invention is not limited to this, The water quantity servo 41 and the water quantity The configuration may be such that either one or both of the regulating valves 43 are not provided.

  As described above, the liquid heating apparatus 1 arranges the water heat exchanger 30 outside the storage unit 6 and supplies the heat medium in the storage unit 6 to the load terminal 75 or in the storage unit 6. It is set as the structure which can replenish the hot water in the bathtub 60 by heat-exchange heating in the arranged heat exchanger 17. FIG. Therefore, in the liquid heating apparatus 1, the thermal energy stored in the storage unit 6 via the heat medium can be effectively used for the use of the load terminal 75 and the reheating of hot water in the bathtub 60.

  Moreover, the liquid heating apparatus 1 of this embodiment operates the circulating pump 32 and supplies the heat medium in the storage part 6 to the hot water heat exchanger 30, thereby supplying hot water (upper water) used for hot water supply or dropping. Water) can be heat exchange heated. Conversely, the hot water supplied from outside is supplied to the water heat exchanger 30 by stopping the supply of the heat medium in the reservoir 6 to the water heat exchanger 30 with the circulation pump 32 stopped. It can be passed through and supplied in an unheated state. For this reason, the liquid heating device 1 can be used in a load operation or a reheating operation, a water supply operation in which hot water supplied from outside the heating system H is supplied in an unheated state, or an additional water mode if the circulation pump 32 is stopped. Can be performed in parallel with the drop-in operation. Moreover, the liquid heating apparatus 1 can perform the load operation and the reheating operation, and the water supply operation and the dropping operation in the additional water mode in parallel even when the circulation pump 32 cannot be operated due to a failure or the like. it can.

  As described above, the liquid heating apparatus 1 can supply the clean water supplied from the outside in a non-heated state (water supply operation, dropping operation in the additional water mode) by stopping the circulation pump 32. it can. Therefore, if the liquid heating device 1 is configured to be able to supply hot water preheated (heated) outside the heating system H by a heating device such as a so-called solar water heater, to the water heat exchanger 30, Even when the circulation pump 32 is not operated or the circulation pump 32 cannot be operated due to a failure or the like, heated hot water can be supplied to the hot-water tap 47 and the bathtub 60.

  Although the above-mentioned liquid heating apparatus 1 illustrated the structure which has arrange | positioned the heat exchanger 17 used in order to chase the hot water in the bathtub 60 inside the storage part 6, this invention is not limited to this. There may be a configuration without the heat exchanger 17. According to this configuration, the capacity of the storage unit 6 can be further reduced, the height of the storage unit 6 can be reduced, and the liquid heating apparatus 1 can be reduced in size.

  Moreover, although the liquid heating apparatus 1 employ | adopted the coil type heat exchanger as the heat exchanger 17 for reheating, and this was arrange | positioned in the storage part 6, this invention is limited to this. For example, as in the case of the heat exchanger 30 for drinking water, a separate heat exchanger is provided outside the storage unit 6, and the heat medium in the storage unit 6 is supplied to the heat exchanger to thereby follow the hot water in the bathtub 60. It is good also as a structure which can be sprinkled.

  In addition, also when it is set as the structure which arrange | positions the heat exchanger for reheating outside the storage part 6, the quantity of heat medium required in order to supply a thermal energy to the load terminal 75 is stored in the storage part 6. It is necessary to have a structure that can be heated. Therefore, when the capacity of the storage unit 6 is the minimum necessary size for heating the heat medium supplied to the load terminal 75, a reheating heat exchanger is provided outside the storage unit 6. It is assumed that the contribution to the compactness of the apparatus configuration of the liquid heating apparatus 1 is small. Therefore, as in the above embodiment, the capacity of the storage unit 6 is set to the minimum necessary for heating the heat medium supplied to the load terminal 75, and the reheating heat exchanger 17 is disposed inside the storage unit 6. By making it the structure accommodated in, the apparatus structure of the liquid heating apparatus 1 whole can be reduced in size.

  In this embodiment, since the water heat exchanger 30 is disposed below the storage unit 6, a high-temperature heat medium is supplied to the water heat exchanger 30 when the hot water supply operation or the dropping operation is stopped. It is difficult for the water heat exchanger 30 to become hot due to heat transfer. Therefore, as described above, even when the connection portion 41a of the water amount servo 41 provided in the water supply system S is slightly opened during the hot water supply operation or the drop-in operation standby, Does not flow in, and it is difficult for a problem such as high temperature hot water to appear immediately after the start of the next hot water supply operation or dropping operation.

  Further, the liquid heating device 1 is configured to wait until the hot water supply operation or the dropping operation is started with the connection portion 41a of the water amount servo 41 being slightly opened. For this reason, the liquid heating device 1 drains water from the water supply system S after performing a combustion test or a water flow inspection at the time of factory shipment or when performing maintenance such as replacement of parts when it is not used for a long period of time. When performing, draining can be carried out without time and effort.

  In the said embodiment, although the heating means 7 was distribute | arranged to the downward direction of the storage part 6, the structure which can heat the heat medium stored in the storage part 6 from the downward side of the storage part 6 was illustrated, this invention is this. For example, a so-called reverse combustion type combustion form is adopted as the heating means 7, and the heating means 7 is arranged above the storage portion 6. It is also possible to employ a configuration in which the heat medium in the storage unit 6 can be heated from the side of the storage unit 6. Also in the case of such a configuration, the heat medium causes convection in the storage unit 6, and the heat medium existing on the upper side of the storage unit 6 is likely to be hotter than the lower side. That is, by arranging the heating means 7 below, above, or on the side of the storage unit 6, convection occurs when the storage unit 6 locally becomes hot, and there is a high possibility that a temperature distribution of the heat medium will occur. Therefore, in the case of such a configuration, if a configuration similar to that of the liquid heating device 1 described above is employed, it is possible to contribute to improvement of so-called tapping characteristics and energy saving.

It is an operation | movement principle figure which shows the liquid heating apparatus concerning one Embodiment of this invention. It is a front view which shows the state which fractured | ruptured a part of liquid heating apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid heating apparatus 2 Main-body part 6 Storage part (storage means)
7 Heating means 17 Heat exchanger (liquid-liquid heat exchanging means)
20 Water supply primary flow path (primary flow path)
21 Water supply primary return channel (primary channel)
30 Heat exchanger for water supply (heat exchange means)
32 Circulation pump (pressure feeding means)
34 Water supply secondary flow path (secondary flow path)
35 Water flow path 41 Water quantity servo (mixing means)
43 Water volume adjustment valve (flow rate adjustment means)
C Enclosure S Water supply system D Heating system F Bath system

Claims (9)

A storage unit having a casing and capable of storing the liquid in the casing; a heating unit capable of heating the liquid in the storage unit from below, above or from the side of the storage unit; a heat exchange unit; The exchange means includes a primary flow path capable of supplying the liquid stored in the storage means, and a secondary flow path through which clean water flows,
The heat exchanging means is disposed at a position spaced downward with respect to the storage means, and the clean water flowing through the secondary flow path is heated with the liquid supplied from the storage means via the primary flow path. A liquid heating apparatus that can be heated by replacement.   The liquid heating apparatus according to claim 1, wherein the heat exchange means is configured by a plate heat exchanger.   The liquid heating apparatus according to claim 1, wherein a pumping unit capable of pumping the liquid is provided in the middle of the primary flow path.   The primary flow path is capable of preferentially taking out the liquid existing above the storage means with respect to the liquid existing below and supplying the liquid to the heat exchange means. The liquid heating apparatus described in 1.   The liquid heating apparatus according to claim 1, further comprising a flow rate adjusting unit capable of adjusting a flow rate of clean water.   The liquid heating apparatus according to claim 1, further comprising a mixing unit that mixes the clean water heated in the heat exchange unit and the clean water supplied from the outside. Mixing means is provided that can mix by flowing in the clean water heated in the heat exchange means and flowing in the secondary flow path, and clean water supplied from the outside,
The mixing means is in a state in which clean water can flow in from the heat exchange means side while stopping heating of clean water in the heat exchange means. Liquid heating device. A heat load system capable of supplying heat energy to an external heat load via the liquid in the storage means and / or the liquid heated by heat exchange with the liquid in the storage means;
A primary flow path is provided independently for the heat load system;
A thermal energy supply operation for supplying thermal energy to an external heat load via the liquid in the storage means and / or the liquid heated by heat exchange with the liquid in the storage means;
In a state where the supply of the liquid from the storage means to the heat exchange means is stopped, the non-heating supply operation for supplying the clean water supplied through the secondary flow path to the outside of the heating system through the heat exchange means It can be implemented,
The liquid heating apparatus according to claim 1, wherein the thermal energy supply operation and the non-heating supply operation can be performed simultaneously.   The liquid-liquid heat exchange means capable of heating the liquid by heat exchange with the liquid stored in the storage means is provided inside the storage means. The liquid heating apparatus as described.

Images