JP2007218476A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of improving space efficiency in a device and reducing costs by sharing a heating circulation pump of a heating circulation water channel and a circulation pump of a reheating circulation water channel while keeping functions of a conventional hot water storage type water heater such as boiling-up, reheating and heat retention, and further reducing running costs by not boiling-up the hot water in a hot water storage tank in a freeze protecting operation in winter. <P>SOLUTION: In this hot water storage type water heater having the hot water storage tank, a heating means for hot water in the hot water storage tank, the heating circulation water channel for circulating the hot water in the hot water storage tank to the heating means by the circulation pump, and the reheating circulation water channel for circulating the hot water in the hot water storage tank to a heat exchanger, a returning water channel of the reheating circulation water channel is connected with a going water channel of the heating circulation water channel at the upstream with respect to the circulation pump, and a flow channel switching means A is disposed on the connecting portion A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention separately includes a hot water storage tank such as a heat pump water heater and a heating means, and uses an indirect heat exchanger that uses the hot water in the hot water storage tank to add or retain hot water in the bathtub. The present invention relates to a hot water storage type water heater having a tub function.

  In recent years, hot water storage water heaters that use midnight power to reduce running costs, such as electric water heaters and heat pump water heaters, have attracted attention. These hot water storage water heaters have a hot water supply function and a hot water filling function for the bathtub, and at the same time, the hot water of the hot water storage tank is used and the function of recognizing and keeping warm the bathtub water in the bathtub by an indirect heat exchanger. There is.

  FIG. 2 shows an example of such a hot water storage type water heater.

  A hot water storage tank 1, a heating means 2, a heating circulation water passage for circulating hot water between the hot water storage tank 1 and the heating means 2, and a heating circulation pump 15 are provided in the heating circulation water passage. The heating circulation channel is composed of an outgoing water channel 3 of the heating circulation channel and a return channel 4 of the heating circulation channel. As a result, the hot water in the hot water storage tank 1 is heated by the heating means 2 and returned to the hot water storage tank 1 again by the heating circulation pump 15.

Moreover, it has the heat exchanger 10 for the bath water of the bathtub 14, and the heat exchanger 10 for heat retention, the memorial circulation water channel which circulates hot water between the hot water storage tank 1 and the heat exchanger 10, and this memory A memory circulation pump 16 is provided in the circulation channel. The memorial circulation channel is composed of an outward channel 11 and a return channel 9. Thereby, the hot water in the bathtub 14 is circulated between the heat exchanger 10 and the bathtub 14 via the bathtub circulation pump 13 at the time of chasing and keeping warm of the bathtub water in the bathtub 14. Moreover, hot water in the hot water storage tank 1 is supplied to the heat exchanger 10 as a heat source of the heat exchanger 10 by the recirculation circulation pump 16, exchanges heat with hot water in the bathtub 14, and then returns to the hot water storage tank 1 again. ing.
JP-A-2005-90908

  However, in the conventional hot water storage type hot water heater, at least a heating circulation pump 15 that circulates hot water between the heating means 2 and the hot water storage tank 1 and a recirculation circulation pump that circulates hot water between the hot water storage tank 1 and the heat exchanger 10. Sixteen or more pumps are required. For this reason, the installation space for two or more pumps is required in the hot water storage type hot water supply apparatus, and there is a problem that the space efficiency is deteriorated and the cost is increased due to the installation of a plurality of pumps. Furthermore, when performing the freeze prevention operation in winter, it is necessary to operate the heating means 2 in the heating circulation channel between the heating means 2 and the hot water storage tank 1, so that it is not necessary to boil the hot water in the hot water storage tank 1 itself. Regardless, running costs may increase by boiling.

  Therefore, the present invention is designed to share the heating circulation pump of the heating circulation water channel and the circulation pump of the additional circulation water channel while maintaining the functions of the conventional hot water storage type hot water heater such as boiling, reheating and heat retention. The purpose is to increase the efficiency of the space and to provide an inexpensive hot water storage type water heater. It is another object of the present invention to provide a hot water storage type hot water heater capable of suppressing running costs without boiling hot water in a hot water storage tank during freezing prevention operation in winter.

This invention solves the said subject with the following structures.
(1) A hot water storage tank, hot water heating means of the hot water storage tank, a heating circulation channel in which hot water of the hot water storage tank circulates between the heating means by a circulation pump, and hot water of the hot water storage tank are connected to a heat exchanger In the hot water storage type water heater having a memorial circulation water channel circulating between
A hot water storage type water heater in which a return water channel of the memorial circulation water channel is connected upstream of the circulation pump to an outgoing water channel of the heating circulation water channel, and a flow path switching means (A) is provided at the connection part (A).
(2) In the item (1), at the time of boiling, the flow path switching means (A) is formed so that the hot water in the hot water storage tank forms a heated circulation water path in the circulating water path that returns to the hot water storage tank via the circulation pump and the heating means. In the case of chasing or keeping warm, the hot water in the hot water storage tank forms a memorial circulation water channel with a circulating water channel that returns to the hot water storage tank via the heat exchanger, the connecting portion (A), the circulation pump and the heating means. When the flow path switching means (A) is operated to perform boiling and reheating, or boiling and keeping heat at the same time, the flow switching is performed so that the heating circulation channel and the recirculation circulation channel are simultaneously formed. A hot water storage type water heater for operating the means (A).
(3) In the item (1) or the item (2), the return water channel of the memorial circulation water channel downstream of the circulation pump is branched, and a flow path switching means (B) is provided in the branch part (B). A hot water storage water heater in which the water channel is connected to a hot water storage tank.
(4) In the item (3), during the memorial service, the hot water in the hot water storage tank is memorized in a circulating water channel that returns to the hot water storage tank through the heat exchanger, the connecting portion (A), the circulation pump, and the branching portion (B). A hot water storage type hot water heater that operates the flow path switching means (A) and the flow path switching means (B) so as to form a circulating water channel.
(5) In any one of items (1) to (4), the return water channel of the heating circulation channel or the return water channel of the memorial circulation channel branches downstream of the heating means, and the channel is switched to this branch part (C). Means (C) is provided, and the branched water channel is connected to the return channel of the memorial circulation channel upstream of the connecting portion (A).
(6) In item (5), when freezing is prevented, the circulating water channel is formed so as to return to the connection part (A) via the connection part (A), the circulation pump, the heating means, and the branch part (C). A hot water storage type hot water heater that operates the flow path switching means (A), the flow path switching means (B), and the flow path switching means (C).
(7) The hot water storage type hot water heater according to any one of items (1) to (6), wherein the heating means is a heat pump.

  According to the first aspect of the present invention, since the circulation pump for the heating circulation channel and the circulation pump for the additional circulation channel can be shared, the efficiency of the space in the apparatus can be improved, and only one pump is required. Cost can be reduced.

  According to the second aspect of the present invention, in the hot water storage type hot water supply apparatus according to the first aspect, by operating the flow path switching means (A), the hot water tank is heated up and the hot water in the bathtub is added by the heat exchanger. It is possible to carry out bathing and warming at the same time by using a heat exchanger that uses hot water from hot water and hot water storage tanks and hot water in hot water storage tanks, making the space in the device more efficient and less costly without compromising functionality. Can be made possible.

  According to the invention described in claim 3, in the hot water storage type hot water supply apparatus described in claim 1 or claim 2, the hot water from the hot water storage tank is subjected to heat exchange at the time of chasing or keeping warm of the hot water in the bathtub by the heat exchanger. It becomes possible to form a circulating water channel that returns directly to the hot water storage tank without using a heating means.

  According to the invention described in claim 4, in the hot water storage type hot water supply apparatus according to any one of claims 1 to 3, hot water from the hot water storage tank is supplied at the time of chasing or keeping warm of the hot water in the bathtub by the heat exchanger. By returning directly to the hot water storage tank without passing through the heating means after the heat exchange, it becomes possible to perform chasing and keeping warm without operating the heating means, and to reduce running costs.

  According to the fifth aspect of the present invention, in the hot water storage water heater according to any one of the first to fourth aspects, the circulation circuit between the heating means and the hot water storage tank can be provided without the hot water storage tank during the freeze prevention operation. It becomes possible to form.

  According to the sixth aspect of the present invention, in the hot water storage type hot water supply apparatus according to the fifth aspect, during the freezing prevention operation, the circulating water channel is formed between the heating means and the hot water storage tank without using the hot water storage tank. There is no need to boil the hot water in the tank, and running costs can be reduced.

  According to a seventh aspect of the present invention, in the hot water storage type hot water heater according to any one of the first to sixth aspects, when a heat pump is used as a heating means for warming hot water stored in the hot water storage tank, It is possible to provide a hot water storage type water heater that not only lowers the cost of the main body but also has excellent running costs.

  An example of the hot water storage type water heater of the present invention is shown in FIG.

  The heating means 2 used in the present invention is not particularly limited as long as the hot water in the hot water storage tank 1 can be heated, and a heat pump, an electric heater, or a hot water heater using combustion heat of gas or kerosene is used. it can. A heat pump type heating device is desirable because it can use midnight power and has high thermal efficiency. In addition, when using a heat pump, since the refrigerant | coolant used with a heat pump can store high temperature hot water, carbon dioxide gas is desirable.

  In the heat pump, the water taken in from the hot water storage tank 1 is heated by the heat pump and then returned to the hot water storage tank 1. Preferably, the water taken in from the lower part of the hot water storage tank 1 is heated by a heat pump and then supplied from the upper part of the hot water storage tank 1. By doing in this way, hot water can be efficiently stored by supplying the low temperature hot water in the lower part of the hot water storage tank 1 to the heat pump and returning it to the upper part at a high temperature.

  The hot water storage tank 1 stores hot water heated by the heating means 2 and is not particularly limited in material, shape, capacity, and the like. For this reason, stainless steel, which is usually used as the hot water storage tank 1 of the hot water storage type hot water heater, is cylindrical, and has a capacity of 300 l, 370 l, 460 l or the like can be used. Moreover, it is desirable to arrange a heat insulating material around the hot water storage tank 1.

  The heating circulation channel is a channel through which hot water in the hot water storage tank 1 circulates between the heating means 2 and includes an outgoing water channel and a return water channel. The outgoing water passage 3 of the heating circulation water passage is a water passage for sending hot water in the hot water storage tank 1 to the heating means 2, and has a circulation pump 5 in the middle of the water passage. The return water channel 4 of the heating circulation channel is a channel for sending hot water heated by the heating means to the hot water storage tank 1.

  The memorial circulation channel is a channel through which hot water in the hot water storage tank 1 circulates between the heat exchanger 10 and includes an outgoing channel and a return channel. The outgoing water channel 11 of the memorial circulation water channel is a water channel for sending hot water from the hot water storage tank 1 to the heat exchanger 10. The return water channel 9 of the memorial circulation water channel is a water channel for returning hot water after heat exchange by the heat exchanger 10 to the hot water storage tank 1.

  The heat exchanger 10 performs heat exchange between the hot water in the hot water storage tank 1 and hot water such as the bathtub 14, and is mainly used when the hot water such as the bathtub 14 is tracked or kept warm. The heat exchanger 10 only needs to be capable of exchanging heat from the hot water in the bathtub 14 using the hot water in the hot water storage tank 1, and includes, for example, a two-pipe heat exchanger and a plate heat exchanger. In addition, although the hot water of the bathtub 14 can be heat-exchanged here, it does not stick to the bathtub 14 if heat exchange is performed by the heat exchanger 10, such as a floor heating device, and hot water is circulated.

  The return water channel 9 of the memorial circulation water channel is connected to the outgoing water channel 3 of the heating circulation water channel upstream from the circulation pump 5 and merges. It is necessary to provide the flow path switching means (A) 6 at the connection portion (A) 6.

  The flow path switching means (A) 6 is not limited as long as it can switch the flow path, but it is desirable to use a so-called three-way valve. By using the electric three-way valve, the flow path can be switched by the control of a microcomputer or the like.

At the time of boiling, the water channel from the heat exchanger 10 is closed and the water channel from the hot water storage tank 1 is opened, so that only hot water from the hot water storage tank 1 is introduced into the forward water channel 3 of the heating circulation water channel, through the heating means. It can be returned to the hot water storage tank 1.
At the time of memorialization or heat insulation, the water channel from the heat exchanger 10 is opened and the water channel from the hot water storage tank 1 is closed, so that only hot water after heat exchange is introduced into the forward water channel 3 of the heating circulation channel, and the heating means is used. Through the hot water storage tank 1.
When boiling and retreating, or boiling and keeping warm at the same time, both the water channel from the heat exchanger 10 and the water channel from the hot water storage tank 1 are opened, so that the hot water after the heat exchange and the hot water from the hot water storage tank 1 are heated. Both of them can be introduced into the outgoing water channel 3 of the heating circulation channel and returned to the hot water storage tank 1 via the heating means.
Moreover, the mixing ratio of the hot water after heat exchange and the hot water of the hot water storage tank 1 can be adjusted by adjusting the opening degree of each water channel.

  In this way, by operating the flow path switching means (A) 6, when boiling, the hot water in the hot water storage tank 1 is heated and circulated in the circulating water path that returns to the hot water storage tank 1 via the circulation pump 5 and the heating means 2. A water channel is formed, and the hot water in the hot water storage tank 1 is returned to the hot water storage tank 1 via the heat exchanger 10, the connecting portion (A) 6, the circulation pump 5 and the heating means 2 when chasing or keeping warm. When a memorial circulation water channel is formed and boiling and chasing, or boiling and heat retention are performed simultaneously, the heating circulation water channel and the memorial circulation water channel can be formed simultaneously.

  That is, by operating the flow path switching means (A) 6, boiling water, chasing or heat retention, and any time when these are performed at the same time, only the circulating pump 5 provided in the outgoing water path 3 of the heating circulation water path can be used. Can be circulated, and the circulation pump 5 can be shared. In addition, this makes it possible to increase the efficiency of the space in the apparatus and to reduce the cost because only one pump is required.

  Furthermore, during the memorial service or heat retention, the hot water in the hot water storage tank 1 is returned to the hot water storage tank 1 via the heat exchanger 10, the connection part (A) 6, the circulation pump 5 and the heating means 2. Therefore, the boiling hot water can be stored without lowering the temperature of the hot water in the hot water storage tank 1 even during remembrance or heat retention.

  The branch part (B) 7 is provided in the forward water channel 3 (returning water channel in the case of the memorial circulation water channel) downstream of the circulation pump 5, that is, in the water channel between the circulation pump 5 and the heating means 2. It is desirable to provide the flow path switching means (B) 7 in the branch part (B) 7 and connect the branched water channel to the hot water storage tank 1.

  The flow path switching means (B) 7 is not limited as long as it is a means capable of switching the flow path, like the flow path switching means (A) 6, but it is desirable to use a so-called three-way valve. By using the electric three-way valve, the flow path can be switched by the control of a microcomputer or the like.

  When it is desired to carry out remedy or heat insulation without operating the heating means 2, first, in the flow path switching means (A) 6, the water channel from the heat exchanger 10 is opened and the water channel from the hot water storage tank 1 is closed. Only the hot water of the water channel from the heat exchanger 10 can be introduced into the outgoing water channel 3 of the heating circulation water channel. Then, in the flow path switching means (B) 7, the water path to the hot water storage tank 1 is opened and the water path to the heating means 2 is closed, so that heat exchange with hot water such as the bathtub 14 is performed for memorialization and heat insulation. The hot water after the operation can be led to the hot water storage tank 1 without using the heating means 2.

  By operating the flow path switching means (A) 6 and the flow path switching means (B) 7 in this way, the hot water in the hot water storage tank 1 is connected to the heat exchanger 10 and the connection portion (A) at the time of memorialization or heat insulation. A memorial circulation water channel can be formed by a circulation water channel that returns to the hot water storage tank 1 via the 6, the circulation pump 5, and the branch portion (B) 7.

  That is, by operating the flow path switching means (A) 6 and the flow path switching means (B) 7, the hot water from the hot water storage tank 1 is directly exchanged without passing through the heating means 2 after heat exchange at the time of chasing or keeping warm. By returning to the hot water storage tank 1, it is possible to perform chasing and heat retention without operating the heating means 2, and it is possible to reduce running costs.

  The branch portion (C) 8 is provided in the return water channel 4 of the heating circulation water channel (the water channel common to the return water channel 9 of the additional circulation water channel), that is, in the water channel from the heating means 2 to the hot water storage tank 1. C) 8 is provided with flow path switching means (C) 8, and the branched water channel is connected to the water channel (return water channel 9 of the memorial circulation water channel) leading from the heat exchanger 10 to the connection unit (A) 6. It is desirable to connect upstream of 6.

  The flow path switching means (C) 8 is not limited as long as it can switch the flow path, as with the flow path switching means (A) 6 and B, but it is desirable to use a so-called three-way valve. By using the electric three-way valve, the flow path can be switched by the control of a microcomputer or the like.

  At the time of preventing freezing, first, in the channel switching means (A) 6, the water channel from the branch part (C) 8 is opened, the water channel from the hot water storage tank 1 is closed, and then in the channel switching unit (B) 7. The water passage to the hot water storage tank 1 is closed, the water passage to the heating means 2 is opened, and the water passage to the hot water storage tank 1 is closed in the flow path switching means (C) 8, and the water path to the connecting portion (A) 6 is opened. By opening, a circulating water channel can be formed among the connection part (A) 6, the circulation pump 5, the heating means 2 and the branch part (C) 8.

  In this way, by operating the flow path switching means (A) 6, the flow path switching means (B) 7, and the flow path switching means (C) 8, the circulation water channel is connected to the connection portion (A) at the time of freezing prevention. 6, the circulation pump 5, the heating means 2, and the branch portion (C) 8 are formed so as to return to the connection portion (A) 6.

  That is, since a circulation circuit is formed between the heating means 2 and the hot water storage tank 1 without passing through the hot water storage tank 1 during the freezing prevention operation, it is not necessary to boil the hot water in the hot water storage tank 1 during the freezing operation, thereby reducing running costs. it can.

  Embodiments of a hot water storage type water heater according to the present invention will be described below with reference to the drawings.

  FIG. 1 shows one embodiment of the present invention. The hot water storage type water heater of the embodiment shown in FIG. 1 includes a hot water storage tank 1, a heating means 2, an outgoing water path 3 for a heating circulation water path, a return water path 4 for a heating circulation water path, a circulation pump 5, and a flow path switching means (A) 6. The flow path switching means (B) 7, the flow path switching means (C) 8, the heat exchanger 10, the outgoing water channel 11 of the additional circulation water channel, the return water channel 9 of the additional circulation water channel, and the like.

  The heating means 2 of the present embodiment uses a heat pump that uses carbon dioxide gas as a refrigerant. As a result, not only can the cost of the hot water storage main body be reduced, but also a hot water storage water heater with excellent running costs can be provided, and the hot water temperature can be increased.

  The hot water storage tank 1 of the present embodiment stores hot water heated by the heating means 2, and is a stainless steel cylinder having a capacity of 370 l.

  The heating circulation channel of the present embodiment is a channel through which hot water in the hot water storage tank 1 circulates between the heating means 2 and includes an outgoing water channel 3 and a return water channel 4. The outgoing water passage 3 of the heating circulation water passage is a water passage for sending hot water in the hot water storage tank 1 to the heating means 2, and has a circulation pump 5 in the middle of the water passage. A return water channel 4 of the heating circulation water channel is a water channel for sending hot water heated by the heating means 2 to the hot water storage tank 1.

  The outgoing circulation channel 3 of the heating circulation channel of this embodiment is connected to the heating means 2 from the lower part of the hot water storage tank 1, and sends hot water in the hot water storage tank 1 to the heating means 2 via the circulation pump 5. Thereby, the low temperature hot water in the lower part of the hot water storage tank 1 is preferentially sent to the heating means 2 and heated. For this reason, the heat pump which is the heating means 2 can be efficiently operated.

  The return water channel 4 of the heating circulation channel of the present embodiment is connected from the heating means 2 to the upper part of the hot water storage tank 1. As a result, the hot hot water after heating is returned to the upper portion of the hot water storage tank 1 at a high temperature, whereby the hot hot water and the cold hot water are divided into hot water layers having different temperatures and stored in the hot water storage tank 1. Since these are difficult to mix, hot water can be stored efficiently.

  The memorial circulation channel of the present embodiment is a channel through which hot water in the hot water storage tank 1 circulates between the heat exchanger 10 and includes an outgoing water channel 11 and a return water channel 9. The outgoing water channel 11 of the memorial circulation water channel is a water channel for sending hot water from the hot water storage tank 1 to the heat exchanger 10. The return water channel 9 of the memorial circulation water channel is a water channel that returns hot water after heat exchange by the heat exchanger 10 to the hot water storage tank 1.

  The outgoing water channel 11 of the memorial circulation water channel of the present embodiment is connected to the heat exchanger 10 from the upper part of the hot water storage tank 1. Thereby, at the time of memorialization or heat retention, since only hot hot water can be taken out and used as a heat source for heat exchange, it is not necessary to boil all the hot water in the hot water storage tank 1 and the running cost is reduced.

  When returning to the hot water storage tank 1 after heating via the heating means 2, the return water channel 9 of the memorial circulation water channel of the present embodiment joins from the connecting portion (A) 6 to the outgoing water channel 3 of the heating circulation water channel, It is heated by the heating means 2 and returned to the upper part of the hot water storage tank 1 through the return water channel 4 of the heating circulation water channel. On the other hand, when returning to the hot water storage tank 1 without passing through the heating means 2, it joins from the connecting portion (A) 6 to the outgoing water passage 3 of the heating circulation water passage, and directly from the branching portion (B) 7 without passing through the heating means 2. The hot water is returned to the lower part of the hot water storage tank 1. As a result, when the hot water returning to the hot water storage tank 1 is hot, it is returned to the upper part of the hot water storage tank 1, and when the hot water returning to the hot water storage tank 1 is low temperature, it is returned to the lower part of the hot water storage tank 1. Since hot hot water and low temperature hot water are not mixed easily and stored in different hot water layers, hot water can be stored efficiently.

  The heat exchanger 10 of the present embodiment uses a plate heat exchanger 10. In order to perform heat exchange of the hot water in the bathtub 14 with the heat exchanger 10 and to perform chasing and heat retention, a bathtub circulation pump 13 is provided between the bathtub 14 and the heat exchanger 10 to circulate. Further, in order to use the hot water of the hot water storage tank 1 as a heat source, an outgoing water channel 11 of a memorial circulation water channel connected to the heat exchanger 10 is provided from the upper side of the hot water storage tank 1.

  The connection part (A) 6 of the present embodiment is provided upstream of the circulation pump 5 in the outgoing water path 3 of the heating circulation water path, and in this connection part (A) 6, a memorial circulation for sending hot water after heat exchange. The return channel 9 of the water channel connects and merges. This connection part (A) 6 is provided with a flow path switching means (A) 6.

  The branch part (B) 7 of the present embodiment is a forward water passage 3 (a return water passage 9 in the case of a memorial circulation water passage) downstream of the circulation pump 5, that is, a water passage between the circulation pump 5 and the heating means 2. The flow path switching means (B) 7 is provided in the branch portion (B) 7, and the branched water channel is connected to the hot water storage tank 1.

  The branch part (C) 8 of this embodiment is provided in the return water channel 4 of the heating circulation channel (water channel common to the return water channel 9 of the memorial circulation channel), that is, in the water channel from the heating means 2 to the hot water storage tank 1. A flow path switching means (C) 8 is provided at the branch portion (C) 8, and the branched water channel is connected to a water channel (return water channel 9 of the memorial circulation water channel) leading from the heat exchanger 10 to the connection unit (A) 6. It is connected upstream of the connection part (A) 6.

  The flow path switching means (A) 6, the flow path switching means (B) 7, and the flow path switching means (C) 8 of the present embodiment use electric three-way valves. Thereby, it becomes possible to switch a flow path by control of a microcomputer or the like.

  Next, the operation in the above configuration will be described.

At the time of boiling, the water channel from the heat exchanger 10 is closed and the water channel from the hot water storage tank 1 is opened, so that only hot water from the hot water storage tank 1 is introduced into the forward water channel 3 of the heating circulation water channel, through the heating means. It can be returned to the hot water storage tank 1.
At the time of memorialization or heat insulation, the water channel from the heat exchanger 10 is opened and the water channel from the hot water storage tank 1 is closed, so that only hot water after heat exchange is introduced into the forward water channel 3 of the heating circulation channel, and the heating means is used. Through the hot water storage tank 1.
When boiling and retreating, or boiling and keeping warm at the same time, both the water channel from the heat exchanger 10 and the water channel from the hot water storage tank 1 are opened, so that the hot water after the heat exchange and the hot water from the hot water storage tank 1 are heated. Both of them can be introduced into the outgoing water channel 3 of the heating circulation channel and returned to the hot water storage tank 1 via the heating means.
Moreover, the mixing ratio of the hot water after heat exchange and the hot water of the hot water storage tank 1 can be adjusted by adjusting the opening degree of each water channel.

  In this way, by operating the flow path switching means (A) 6, when boiling, the hot water in the hot water storage tank 1 is heated and circulated in the circulating water path that returns to the hot water storage tank 1 via the circulation pump 5 and the heating means 2. A water channel is formed, and the hot water in the hot water storage tank 1 is returned to the hot water storage tank 1 via the heat exchanger 10, the connecting portion (A) 6, the circulation pump 5 and the heating means 2 when chasing or keeping warm. When a memorial circulation water channel is formed and boiling and chasing, or boiling and heat retention are performed simultaneously, the heating circulation water channel and the memorial circulation water channel can be formed simultaneously.

  That is, by operating the flow path switching means (A) 6, boiling water, chasing or heat retention, and any time when these are performed at the same time, only the circulating pump 5 provided in the outgoing water path 3 of the heating circulation water path can be used. Can be circulated, and the circulation pump 5 can be shared. In addition, this makes it possible to increase the efficiency of the space in the apparatus and to reduce the cost because only one pump is required.

  Furthermore, during the memorial service or heat retention, the hot water in the hot water storage tank 1 is returned to the hot water storage tank 1 via the heat exchanger 10, the connection part (A) 6, the circulation pump 5 and the heating means 2. Therefore, the boiling hot water can be stored without lowering the temperature of the hot water in the hot water storage tank 1 even during remembrance or heat retention.

  When it is desired to perform chasing or heat insulation without operating the heating means 2, first, in the flow path switching means (A) 6, the water path from the heat exchanger 10 is opened and the water path from the hot water storage tank 1 is closed. Thereby, only the hot water of the water channel from the heat exchanger 10 can be introduced into the outgoing water channel 3 of the heating circulation water channel. Then, in the flow path switching means (B) 7, the water path to the hot water storage tank 1 is opened and the water path to the heating means 2 is closed, so that heat exchange with hot water such as the bathtub 14 is performed for memorialization and heat insulation. The hot water after the operation can be led to the hot water storage tank 1 without using the heating means 2.

  By operating the flow path switching means (A) 6 and the flow path switching means (B) 7 in this way, the hot water in the hot water storage tank 1 is connected to the heat exchanger 10 and the connection portion (A) at the time of memorialization or heat insulation. It becomes possible to form a memorial circulation water channel by a circulation water channel that returns to the hot water storage tank 1 via the 6, the circulation pump 5, and the branch part (B) 7.

  At the time of preventing freezing, first, in the channel switching means (A) 6, the water channel from the branch part (C) 8 is opened, the water channel from the hot water storage tank 1 is closed, and then in the channel switching unit (B) 7. The water passage to the hot water storage tank 1 is closed, the water passage to the heating means 2 is opened, and the water passage to the hot water storage tank 1 is closed in the flow path switching means (C) 8, and the water path to the connecting portion (A) 6 is opened. By opening, a circulating water channel can be formed among the connection part (A) 6, the circulation pump 5, the heating means 2 and the branch part (C) 8.

  In this way, by operating the flow path switching means (A) 6, the flow path switching means (B) 7, and the flow path switching means (C) 8, the circulation water channel is connected to the connection portion (A) at the time of freezing prevention. 6, the circulation pump 5, the heating means 2, and the branch portion (C) 8 are formed so as to return to the connection portion (A) 6.

  That is, since a circulation circuit is formed between the heating means 2 and the hot water storage tank 1 without passing through the hot water storage tank 1 during the freezing prevention operation, it is not necessary to boil the hot water in the hot water storage tank 1 during the freezing operation, thereby reducing running costs. it can.

It is a block diagram of the hot water storage type hot water heater in the Example of this invention. It is a block diagram of the hot water storage type water heater which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 2 ... Heating means 3 ... Forward water channel 4 of heating circulation water channel ... Return water channel of heating circulation water channel 5 ... Circulation pump 6 ... Channel switching means (A) (connection part (A))
7: Channel switching means (B) (branch portion (B))
8 ... Channel switching means (C) (branch part (C))
DESCRIPTION OF SYMBOLS 9 ... Return water channel of memorial circulation water channel 10 ... Heat exchanger 11 ... Outward water channel 12 of memorial circulation water channel ... Water channel 13 from a branch part (B) to a hot water storage tank ... Bathtub circulation pump 14 ... Bathtub 15 ... Heating circulation pump 16 … Memorial circulation pump

Claims (7)

  A hot water storage tank, hot water heating means of the hot water storage tank, a heating circulation channel in which hot water of the hot water storage tank circulates between the heating means by a circulation pump, and hot water of the hot water storage tank are connected between the heat exchanger. In the hot water storage type water heater having a recirculating recirculating water channel, a return water channel of the recirculating water channel is connected upstream of the circulation pump to an outgoing water channel of the heating recirculating water channel, and this connection (A) A hot water storage type water heater provided with the flow path switching means (A).   In claim 1, at the time of boiling, the flow path switching means (A) is operated so that the hot water in the hot water storage tank forms a heated circulating water path in the circulating water path returning to the hot water storage tank via the circulation pump and the heating means, At the time of memorialization or warming, a flow path is formed so that the hot water in the hot water storage tank forms a memorial circulation water channel in the circulation water channel that returns to the hot water storage tank via the heat exchanger, the connecting portion (A), the circulation pump, and the heating means. When the switching means (A) is operated to perform boiling and chasing, or when boiling and keeping heat at the same time, the channel switching means (A) so as to form the heating circulation channel and the chasing circulation channel simultaneously. Hot water storage water heater that operates.   3. A return water channel downstream of the circulation circulation channel downstream of the circulation pump is branched according to claim 1 or 2, and a flow path switching means (B) is provided at the branch part (B). Hot water storage water heater connected to the tank.   In claim 3, during the renewal, a recirculation water channel is formed by a circulation water channel in which the hot water in the hot water storage tank returns to the hot water storage tank through the heat exchanger, the connection part (A), the circulation pump and the branch part (B). A hot water storage type water heater that operates the flow path switching means (A) and the flow path switching means (B) as described above.   The return water channel of the heating circulation channel or the return water channel of the memorial circulation channel branches downstream of the heating means in any one of claims 1 to 4, and the flow path switching means (C) is provided at the branch portion (C). The hot water storage type hot water heater provided and the branched water channel is connected to the return water channel of the memorial circulation water channel upstream of the connection part (A).   In claim 5, when freezing is prevented, the circulation water channel is formed so as to return to the connection portion (A) through the connection portion (A), the circulation pump, the heating means, and the branch portion (C). A hot water storage type water heater for operating the path switching means (A), the flow path switching means (B), and the flow path switching means (C). The hot water storage type hot water supply apparatus according to any one of claims 1 to 6, wherein the heating means is a heat pump.

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