JP3932026B2 - Water heater using external collector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, tap water or the like enters the heat storage tank based on the supply water pressure, and the water in the heat storage tank is supplied to the external heat collector and heated, and then returned to the heat storage tank. The present invention relates to a hot water apparatus using an external collector configured such that the hot water used is used for hot water supply.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, as this type of external heat collector using hot water device, a solar heat using hot water device using a solar heat collector as an external heat collector as shown in FIG. 5 is known. In this thing, the water input circuit 40 which injects the tap water from a water pipe etc. with respect to the bottom part of the thermal storage tank 2, the hot water supply circuit 50 which discharges warm water from the top part of the said thermal storage tank 2, and water from the bottom part of the said thermal storage tank 2 Is provided to the heat collector 3, and a return path 60 b for returning the hot water heated by the solar heat collector 3 to the top of the heat storage tank 2. A circulation pump 63 is interposed in the outgoing path 60a, and the circulating pump 63, the outgoing path 60a, and the return path 60b circulate water and hot water in the heat storage tank 2 between the heat collector 3 and collect heat. The heat collecting circuit 60 is configured so that the heat collecting operation is performed by the operation of the circulation pump 63.
[0003]
  The heat storage tank 2 is always filled with water based on the feed water pressure from the water entry circuit 40, and water is introduced by the amount discharged from the hot water circuit 50. That is, the supply pressure of the tap water also acts on the heat storage tank 2, the piping of the heat collection circuit 60, and the heat collector 3, and the hot water from the hot water supply circuit 50 when using hot water is also based on the supply water pressure. To be done. The configuration in which the tap water supply pressure extends to the heat collector 3 in this way is also referred to as a direct pressure type or a direct type or a direct connection type in that tap water is directly supplied to the heat collector 3 as a heat storage medium.
[0004]
  When hot water is used, the hot water discharged from the heat storage tank 2 is mixed with the water in the water branch pipe 46 branched from the water input circuit 40 in the hot water mixing valve 51 at a predetermined mixing ratio, and adjusted to a predetermined temperature and then downstream. Hot water is discharged for hot water supply to a hot water tap at the end or for supply to a water inlet side of a hot water supply device or the like as an auxiliary heating source.
[0005]
[Problems to be solved by the invention]
  However, the solar water heating hot water apparatus has various disadvantages as described below due to the direct pressure type.
[0006]
  That is, firstly, the tap water supply pressure from the water intake circuit 40 also acts on the heat storage tank 2, the piping of the heat collection circuit 60, and the heat collector 3. The piping and various devices of the circuit 60 are required to have pressure resistance capable of withstanding the above-mentioned water supply pressure, and must be configured using members and parts strengthened to satisfy this pressure resistance, resulting in an increase in cost. It has been forced to become. In particular, in the case of a solar heat collector, unlike other heat collectors, a significant increase in cost is incurred in order to satisfy the pressure resistance described above. Further, the pump performance of the circulation pump 63 also requires higher performance in order to circulate the water in the heat storage tank 2 on which the supply water pressure acts, and this also increases the cost.
[0007]
  Secondly, since tap water itself used for drinking flows into the heat collector 3 and the heat collection circuit 60, etc., water is supplied to the pipes and valves of the heat collector 3 and the heat collection circuit 60. It is necessary to use the one that meets the standards compliant with the law, which leads to high costs. In other words, it is necessary to make the structure and material satisfy the water supply measure structure and material standards (hereinafter simply referred to as “structure and material standards”) stipulated in Article 4 of the Water Supply Law Enforcement Ordinance based on Article 16 of the Water Supply Law. Will occur. With this structure / material standard, not only the pressure resistance standards, but also the leaching standards, water hammer standards, anticorrosion standards, backflow standards, cold resistance standards, and so on. Therefore, it is required to satisfy all the standards regarding durability.
[0008]
  Thirdly, piping that satisfies pressure resistance and durability as described above, that is, hard and hard piping, must be used for the heat collecting circuit, to prevent freezing in cold districts and at low temperatures in winter, and the above-mentioned cold resistance. In order to satisfy the standards, there is a need to install water drainage equipment (for example, a drain valve 64 and a vacuum breaker 65) as a measure for preventing damage due to freezing. It is a factor of.
[0009]
  The above inconveniences are not limited to the case where the external collector is a solar collector, but other collectors, for example, a collector in the case of collecting heat radiated from a condenser of a heat pump to heat-heat water. This also occurs in a hot water device that uses the water as an external collector.
[0010]
  This invention is made | formed in view of such a situation, The place made into the objective is to provide the external heat collector utilization hot water apparatus which can eliminate the various inconvenience resulting from a direct pressure type. Specifically, the standard of the water supply law is removed, and even if it is a direct pressure type, a significant cost reduction can be achieved.
[0011]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention includes a heat storage tank that stores water as a heat storage medium, and an external heat collector that collects heat to heat the water, and the heat storage tank has water at a predetermined water supply pressure. On the other hand, the downstream end of the water input circuit for supplying water and replenishing water to the heat storage tank is connected, while the water in the heat storage tank is connected to the external heat collector between the external heat collector and the heat storage tank. Various means described in the following claims are adopted for an external heat collector utilizing hot water device in which a heat collecting circuit for performing heat collecting operation for forced circulation between the pipes is provided. .
[0012]
  In other words, the invention according to claim 1 includes at least an on-off switching valve that is interposed in the middle of the water-filling circuit and switches between water entering and shutting off the heat-storage tank by switching between on-off and is in a shut-off state. Sometimes the edge cutting means for cutting the edge between the upstream side and the downstream sideAnd an internal pressure release means attached to the heat storage tank to switch the internal pressure in the heat storage tank between an open state and a non-open state, and the heat storage tank at a position closer to the heat collecting circuit than the heat storage tank. It was decided to provide a blocking means for switching between the water state and the blocking state. Then, after switching the shut-off means to the shut-off state and the internal pressure release means to the open state, the edge-cutting means is switched to the water-filled state, so that the water storage tank is filled and refilled with water by the water-filling circuit. After switching the means to the shut-off state and the internal pressure release means to the open state, the shut-off means is switched to the water-supply state. Further, the heat collecting operation is performed, and the shut-off means is switched to the shut-off state, the internal pressure release means is switched to the non-open state, and the edge cutting means is switched to the water-filled state, whereby the hot water is discharged from the heat storage tank to the hot-water circuit. The hot water supply operation is performed.
[0013]
  As the “edge cutting means”, when the open / close switching valve is in a closed state (shut off state), the inside of the water inlet circuit between the open / close switching valve and the heat storage tank is connected to the atmosphere side to perform edge cutting. What is necessary is just to use the thing of the structure which interrupts | blocks from the air | atmosphere side and can enter the heat storage tank through the water intake circuit when the said on-off switching valve is an open state (water incoming state). This is the same in the following claims.
[0014]
  According to claim 1, the necessity of satisfying the structure and material standards stipulated in the Water Supply Law can be excluded by the interposition of the edge cutting means, and the cost is significantly reduced compared to the case where the structure and material standards are necessary. Can be realized. That is, it is possible to eliminate the influence of the feed water pressure on the external heat collector, the piping and the circulation pump constituting the heat collection circuit, and make the pressure resistance performance and the pump performance unnecessary. Along with this, it is possible to adopt flexible materials with the assumption that the piping has the necessary minimum strength, there is no risk of damage due to freezing, and as a measure to prevent freezing, facilities for draining water are used. No need to add. Moreover, even if the above structure and material standards are exempted, even if the upstream side of the incoming circuit falls into a negative pressure state due to the occurrence of a power failure or the like, the negative pressure is eliminated by the above edge cutting means. As a result, it is possible to reliably eliminate the possibility of the occurrence of backflow toward the upstream side of the water intake circuit.
[0015]
(Delete)
[0016]
  And aboveIt is possible to effectively reduce both the water supply / replenishment by the water intake circuit, the heat collection operation by the heat collection circuit, and the hot water supply operation by the hot water supply circuit while making it possible to greatly reduce the cost by excluding the water law . That is, when water is supplied or replenished by the water input circuit, the shut-off means is switched to the shut-off state, the internal pressure release means is switched to the open state, and the edge-cutting means is switched to the water-filled state. What is necessary is just to switch an interruption | blocking means to a water supply state, after switching an internal pressure release means to an open state in the interruption | blocking state, respectively. Further, at the time of hot water supply operation, the cutting means is switched to the blocking state, the internal pressure releasing means is switched to the non-opening state, and the edge cutting means is switched to the water entering state. As a result, the supply water pressure from the incoming water circuit acts on the heat storage tank at the time of hot water discharge, and the hot water in the heat storage tank can be discharged through the hot water supply circuit based on this supplied water supply pressure. There is no need to provide a pump or the like.
[0017]
  The “internal pressure releasing means” may be simply configured by air venting that can be switched between open and closed. Alternatively, switching consisting of a combination of a pressure safety valve and an on-off valve that can reduce and maintain the internal pressure of the heat storage tank to a predetermined low internal pressure that does not require special strength on the collector or heat collecting circuit side You may comprise by the pressure reduction means of a type | formula.
[0018]
  Claim2In the invention according to the present invention, it is configured to include at least an on-off switching valve that is interposed in the middle of the water-intake circuit and performs switching between water entering and shutting off the heat storage tank by switching between opening and closing. An edge cutting means for cutting the gap between the internal pressure, an internal pressure release means that is attached to the heat storage tank and switches the internal pressure in the heat storage tank between an open state and a non-open state, and a position closer to the heat collection circuit than the heat storage tank A shut-off means for switching between the water storage state and the shut-off state with respect to the heat storage tank;Outing from hot water storage tankInterposed in the hot water circuitReleases the pressure of slaughter pressure when the downstream side of the tapping circuit is openedProviding slaughter pressure means anddid. Then, after switching the shut-off means to the shut-off state and the internal pressure release means to the open state, the edge-cutting means is switched to the water-filled state, so that the water storage tank is filled and refilled with water by the water-filling circuit. The heat collecting operation is performed by switching the means to the shut-off state and the internal pressure releasing means to the open state, and then switching the shut-off means to the water state. The hot water supply operation of discharging the hot water from the heat storage tank to the hot water circuit is performed by switching the discharge means to the non-opening state and then switching the edge cutting means to the incoming water state.
[0019]
  Claim2According to the claim1In addition to all the above-described actions, the following actions are obtained. That is, the claim1When performing hot water discharge based on the water supply pressure, the water supply pressure from the incoming water circuit side is applied to the heat storage tank by opening / closing switching etc., and the hot water supply to the hot water supply circuit is encouraged, and the water supply pressure is always applied. Compared to the hot water delay. On the other hand, by interposing the livestock pressure means, for example, when a hot water tap at the downstream end of the hot water supply circuit is opened, hot water is immediately discharged by the internal pressure stored in the livestock pressure means so far, in the initial stage of hot water supply. Even hot water can be supplied. And after that, the hot water is continued by the action of the supply water pressure from the incoming water circuit.
[0020]
  This claim2The external water collector utilizing hot water device may further comprise a pressure switch for detecting a predetermined internal pressure drop in the tapping circuit at a downstream position of the animal pressure means.3). By doing so, it becomes possible to immediately detect the occurrence of a hot water supply request from the downstream end of the hot water supply circuit (for example, that the hot water tap has been opened). In other words, the above hot water supply request can be detected by, for example, a water flow switch, but the water flow switch can detect only when a flow of water of a certain amount of flow occurs. It cannot be detected. On the other hand, in the case of a pressure switch, since the pressure drop of the livestock pressure means is detected, even a low flow rate of choro-choro can be detected with high accuracy, and switching to a hot water supply operation is highly responsive. It becomes possible to execute. Furthermore, according to the detection of the hot water supply request by the water flow switch, the hot water tap cannot be established unless it is lower than the top of the heat storage tank, but if the detection by the pressure switch is adopted, the hot water tap is installed higher than the top of the heat storage tank. Even if it is, it can be detected that the hot-water tap has been opened.
[0021]
  Moreover, the above claims 1 to claim3As the edge cutting means in any of the external heat collector using hot water collectors, the open / close switching valve and a water inlet provided in the open atmosphere or atmosphere communication space may be provided. Is preferably employed. That is, when the water supply pressure is received at the opening / closing switching valve and at a position downstream of the opening / closing switching valve, the valve is closed and the atmosphere side is shut off, and when the supply water pressure is released, the valve is opened and returned to communicate with the atmosphere side. An edge release means may be configured by providing an atmosphere release valve.4). In this case, just by switching between the water-filled state and the shut-off state of the open / close switching valve, the communication state that is automatically shut off and sealed from the atmosphere side in response to the switchover, and the edge cut that communicates with the atmosphere side. It becomes possible to switch to the state. In other words, if the open / close switching valve is in the water-filled state, the atmosphere release valve is automatically closed and communicated by receiving the water supply pressure, and if the open / close switching valve is in the shut-off state, the water supply pressure is eliminated and the air release valve is released. Automatically returns to the valve opening state. In addition,ThisMore specifically, the air release valve of the edge cutting means includes a valve body and an opening urging spring, as shown in an embodiment described later, and an opening urging spring when the opening / closing switching valve is in a shut-off state. Is opened to communicate with the atmosphere opening port, and when the opening / closing switching valve enters the water inlet state, the water supply pressure from the water inlet circuit is received and the valve is closed against the opening biasing spring to shut off the atmosphere opening port. What is necessary is just to be the structure to do.
[0022]
  Further, claims 1 to claim4In any one of the external heat collecting hot water heaters, a bypass circuit that bypasses the open / close switching valve by connecting the water intake circuits on both the upstream and downstream sides sandwiching the open / close switching valve constituting the edge cutting means, and the bypass circuit It may be further provided with a manual on-off valve for manually switching between the incoming water through the bypass circuit and the interruption of the incoming water.5). In this case, the on / off switching valve constituting the edge cutting means breaks down, making it impossible to switch from the shut-off state to the water entering state, or the control means for controlling the switching of the on / off switching valve is caused by a power failure or the like. Even when an abnormal situation occurs in which switching control becomes impossible, hot water supply operation (use of hot water supply) through the hot water supply circuit is possible. That is, the manual on-off valve is normally closed during normal operation, and when the switching cannot be performed as described above, the manual on-off valve is manually opened to replenish and supply water to the heat storage tank through the bypass circuit. Water pressure can be propagated and hot water can be supplied through a hot water circuit. In the case of receiving the application of the structure / material standard based on the Water Supply Law, the installation of such a bypass circuit itself is not allowed and the above-mentioned abnormal situation cannot be dealt with. -It can be installed for the first time as a configuration that can exclude the application of material standards, and the above-described action can be obtained.
[0023]
  Claims 1 to claim as described above5As the external heat collector in any one of the above-mentioned hot water devices using an external heat collector, a solar heat collector that collects solar heat can also be used.6). In the case of a solar heat collector, the pressure-resistant performance based on the water supply law is exempted, which greatly simplifies the structure and material, and realizes a significant cost reduction of the external water collector utilizing hot water device.
[0024]
【The invention's effect】
  As described above, claims 1 to claim6According to any one of the external water collector using hot water devices, the external water collector using hot water device can be exempted from the structure and material standards stipulated in the Water Supply Law by interposing the edge cutting means. The cost can be greatly reduced compared to the case where the standard is applied. In other words, it is possible to eliminate the influence of the feed water pressure on the external heat collector and the piping and circulation pump constituting the heat collecting circuit to eliminate pressure resistance performance and pump performance. A flexible material can be used on the premise of having strength, and additional equipment for draining water can be eliminated as a measure for preventing freezing. Moreover, even if the above structure and material standards are exempted, even if the upstream side of the water intake circuit falls into a negative pressure state due to the occurrence of a power failure or the like, the negative pressure is immediately reduced by the edge cutting means. Therefore, the risk of backflow toward the upstream side of the incoming water circuit can be reliably eliminated.
[0025]
  or, Excluding application of the Water Supply Law, while realizing significant cost reductions, it is possible to efficiently switch between water input / replenishment by the water input circuit, heat collection operation by the heat collection circuit, and hot water supply operation by the hot water circuit. become able to. And at the time of hot water supply operation, the hot water in a heat storage tank can be discharged through a hot water supply circuit based on the water supply pressure from a water intake circuit, and it is not necessary to newly provide a pressurizing pump etc. for hot water supply.
[0026]
  In particular, claim 2According to the claim1In addition to all the effects of the above, when the hot water is discharged through the hot water circuit, for example, when the hot water tap at the downstream end of the hot water circuit is opened, the hot water is immediately discharged by the internal pressure stored in the livestock pressure means. Even hot water.
[0027]
  Claim3According to the claim2By adding a pressure switch to the livestock pressure means in the external water collector utilizing hot water device, it is possible to immediately detect the occurrence of a hot water supply request from the downstream end of the tapping circuit, even at a low flow rate. Switching to can be executed with good responsiveness. In addition, even when the hot water tap is installed at a position higher than the top of the heat storage tank, it can be reliably detected by the pressure switch that the hot water tap has been opened.
[0028]
  Claim4According to claim 1 to claim3As an edge cutting means in any of the hot water heaters using an external collector, only the switching of the on / off switching valve between the water entering state and the shutting off state is performed, and the communication automatically sealed off from the atmosphere side in response to the switching. It becomes possible to switch between the state and the edge cutting state communicated with the atmosphere side.
[0029]
  Claim5According to claim 1 to claim4In any one of the external heat collecting hot water heaters described above, by adding a bypass circuit and a manual on-off valve, a failure of the on-off switching valve constituting the edge cutting means or a control means for controlling the switching of the on-off switching valve is caused by a power failure or the like. Even when an abnormal situation occurs in which the switching control becomes impossible, the hot water in the heat storage tank can be discharged through the hot water supply circuit, so that hot water can be used.
[0030]
  Claim6According to claim 1 to claim5When using a solar heat collector as an external heat collector in any of the hot water devices using an external collector, the pressure and pressure performance based on the Waterworks Law is exempted, and the structure and material are greatly simplified. It is possible to realize a significant cost reduction of the entire external water collector utilizing hot water apparatus.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0032]
<First Embodiment>
  FIG. 1 shows a hot water apparatus using an external collector according to a first embodiment of the present invention. The first embodiment employs a solar heat collector (hereinafter simply referred to as “heat collector”) that collects solar heat as an external collector.
[0033]
  In the figure, 1 is an apparatus main body, 2 is a heat storage tank accommodated in the apparatus main body 1, and 7 is a heat collector installed above the apparatus main body 1 in a place receiving outdoor solar heat, such as on the roof. It is. In addition, as for the positional relationship between the heat collector 7 and the heat storage tank 2, the heat collector 7 is often installed above, but the heat collector 7 is not necessarily higher than the heat storage tank 2 in the present invention. No, the combustor 7 may be installed at the same level as or below the heat storage tank 2.
[0034]
  The heat storage tank 2 is a sealed container formed of, for example, a stainless steel plate, and a downstream end of the water intake circuit 4 and an upstream end of the outgoing path 8a of the heat collection circuit 8 are connected to the bottom of the heat storage tank 2 respectively. Moreover, the upstream end of the hot water circuit 9 and the downstream end of the return path 8b of the heat collecting circuit 8 are respectively connected to the top. Further, at the top of the heat storage tank 2, a pressure safety valve 101 constituting the internal pressure release means 10, a pressure reducing operation state (internal pressure release state) by the pressure safety valve 101, and a pressure reduction operation thereof in a non-operating state (internal pressure non-opening) And an open / close switching valve 102 that switches to each other. The upper limit pressure of the pressure safety valve 101 is 0.1 kgf / cm, for example.²The heat storage tank 2 is maintained below the upper limit pressure in the reduced pressure operating state. In the figure, reference numeral 21 denotes a maintenance drain pipe for draining water or hot water in the heat storage tank 2 during maintenance of the heat storage tank 2, and 22 is an open / close valve for opening and closing the drain pipe 21. Is a low temperature thermistor that detects the temperature of the bottom of the heat storage tank 2.
[0035]
  The upstream side (primary water supply side) of the water intake circuit 4 is connected to a water pipe, and the pressure reducing valve 41, the water amount sensor 42 for detecting the incoming water flow rate, and the open / close switching valve 43 from the upstream side in the apparatus main body 1 The air release valve 44 and a pair of check valves 45 are interposed. Further, a water branch pipe 46 is branched from the downstream side position of the check valve 45 of the water inlet circuit 4, and the water branch pipe 46 is mixed with a hot and cold water mixing valve 91 interposed in the middle of the hot water circuit 9. It is designed to supply water. The pressure reducing valve 41 is the original water pressure from the water pipe (5 to 8 kgf / cm²) Eg 4kgf / cm²It is designed to reduce the water supply pressure to a certain level. And the heat storage tank 2 is always kept in a full state by the water entering from the water inlet circuit 4, and if there is hot water (use of hot water supply) from the hot water circuit 5, it is supplied by the amount of hot water used. Water is introduced based on water pressure.
[0036]
  The opening / closing switching valve 43 and the atmosphere release valve 44 constitute edge cutting means. The atmosphere release valve 44 opens and closes a valve body 442 that opens and closes the atmosphere release port 441 communicated with the water inlet circuit 4, and opens the valve body 442. An open biasing spring 443 for biasing is provided. The opening urging spring 443 contracts when the supply water pressure is received, and closes the valve body 442. When the supply water pressure is released, a spring load is set so that the valve body 442 is returned to the open state by an elastic restoring force. Yes.
[0037]
  The downstream end of the hot water circuit 9 is connected to the water inlet side of an instantaneous hot water heater (not shown), and hot water is supplied to a hot water tap or the like through the hot water heater. In addition, you may employ | adopt the structure which connects the downstream end of the said hot-water circuit 9 directly to the said hot-water tap. Accordingly, the hot water supply by the hot water circuit 9 is such that when the hot water tap or the like is opened, hot water in the heat storage tank 2 is discharged to the hot water circuit 9 based on the supplied water pressure acting as described later. And if the hot water temperature in the thermal storage tank 2 is high, the hot water after mixing water with the hot water mixing valve 91 will be supplied to the water heater or hot water tap, and if the hot water temperature is low, the water heater will be used as it is. Or it supplies to a hot-water tap. In FIG. 1, 90 is a pressure safety valve, and this pressure safety valve sets the internal pressure in the hot water circuit 5 discharged from the heat storage tank 2 to a predetermined upper limit pressure (for example, 5 kgf / cm).²Degree) to keep below.
[0038]
  A check valve 92, an accumulator 93 as a livestock pressure means, a pressure switch 94, and a water flow switch 95 are sequentially provided in the hot water circuit 5 from the hot water mixing valve 91 to the downstream side. This pressure switch 94 complements the detection of water flow generation in a lower flow rate range than the detection range of the water flow switch 95, and if the internal pressure of the tapping water flow based on the stock pressure from the accumulator 93 decreases by a predetermined amount during tapping. The switch is turned ON to detect the occurrence of a slight low flow rate and output to the controller 11 described later that a hot water supply request has occurred.
[0039]
  The heat collection circuit 8 circulates water or hot water in the heat storage tank 2 between the heat collector 3 and stores solar heat collected by the heat collector 7 in the heat storage tank 2 in the state of hot water. belongs to.
[0040]
  Specifically, the heat collecting circuit 8 has an outgoing path 8a, a heat collector 7 whose downstream end is communicated with the lower part, and an upstream end connected to the upper part of the heat collector 7. And a return path 8b. An open / close switching valve 81, a circulation pump 82, and a check valve 83 are provided in the forward path 8a as a shut-off means in the vicinity of the heat storage tank 2. The return path 8b is provided with a check valve 84 as a shut-off means in the vicinity of the heat storage tank 2. In FIG. 1, reference numeral 85 denotes a high temperature thermistor that detects the temperature of hot water after being heated by the heat collector 7.
[0041]
  The on / off switching valves 43, 81 and 102 are both constituted by electromagnetic valves, and the on / off switching valves 43, 81 and 102 and the circulation pump 82 are switched by a controller 11 as control means housed in the apparatus main body 1, respectively. Alternatively, operation control is performed, and thereby switching control such as a heat collecting operation and a hot water supply operation is performed. As shown in FIG. 2, the controller 11 includes a heat collection operation control unit 12, a hot water supply operation control unit 13, and the like. Upon receiving a predetermined heat collection operation command or a hot water supply request, the on / off switching valve 43, The switching between 81 and 102 and the operation of the circulation pump 82 are controlled.
[0042]
  When the temperature detected by the high temperature thermistor 85 is higher than a predetermined value with respect to the temperature detected by the low temperature thermistor 23, the heat collection operation control unit 12 outputs a heat collection operation command and performs switching control for starting the heat collection operation. It has become. That is, the open / close switching valve 43 is switched to the shut-off state, the air release valve 44 is opened, the open / close switching valve 102 is switched to the decompression operation state (open operation state), and the internal pressure is released by the pressure safety valve 101. The switching valve 81 is switched to the communication state, and the circulation pump 82 is operated. Since the on / off switching valve 43 is shut off, the propagation of the feed water pressure from the incoming water circuit 4 is shut off, and the on / off switching valve 102 is in the open operating state, so that it operates in the heat storage tank 2 until then. The supplied water pressure is released. Thereby, a relatively high supply water pressure does not act on the heat collection circuit 8 and the heat collector 7. And the temperature with the high temperature thermistor 85 is detected when the temperature detected by the low temperature thermistor 23 is high and sufficient heat is already stored in the heat storage tank 2, or when heat cannot be collected due to solar radiation. When the difference is less than the predetermined value, the operation of the circulation pump 82 is stopped, the heat collecting operation is stopped, and the heat collecting standby state is set. In this heat collection standby state, when the temperature difference becomes equal to or greater than the predetermined value, the circulation pump 82 is operated again to start the heat collection operation, and this is repeated.
[0043]
  When an ON signal is output from the pressure switch 94 or the water flow switch 95, the hot water supply operation control unit 13 determines that the hot water tap at the downstream end has been opened and hot water use has started, that is, a hot water supply request has been issued, If the heat collecting operation is being performed, the heat collecting operation is forcibly stopped, and then the switching control for the hot water supply operation is performed while the heat collecting standby state is maintained.
[0044]
  That is, as soon as the hot water tap is opened, water is discharged toward the downstream side based on the release of the pressure accumulated in the accumulator 93, and when the pressure switch 94 detects that the internal pressure has decreased due to the release of the pressure, It is determined that a request has been issued, and switching control is performed. If the heat collecting operation is in progress, the circulation pump 82 is stopped, and if it is in the heat collecting standby state, the open / close switching valves 81 and 102 are both closed and switched, and the open / close switching valve 43 is opened. To do. Thereby, as a result of the water supply pressure from the incoming water circuit 4 acting on the heat storage tank 2, the hot water in the heat storage tank 2 is discharged from the top to the hot water circuit 9, and hot water is supplied to the hot water tap at the downstream end. Then, if the output of the ON signal from the water flow switch 95 is turned OFF, it is determined that the hot water tap is closed, and conversely, the open / close switching valve 43 is switched to the closed operation to block propagation of the feed water pressure. The opening / closing switching valves 81 and 102 are both switched to open operation.
[0045]
  According to the above, the supply water pressure does not act on the piping of the heat collection circuit 8 and the circulation pump 82 or the heat collector 7 itself, and the pressure resistance performance and the pump capacity that can counter the supply water pressure are not required. it can. Moreover, by interposing the edge cutting means consisting of the open / close switching valve 43 and the air release valve 44, the water supply law is excluded, that is, the downstream side of the edge cutting means is treated as miscellaneous water instead of tap water. It can be a device that is not subject to the application of structural and material standards. This eliminates the need for the pressure resistance described above, and eliminates the risk of freezing damage by using, for example, a flexible nylon hose as the piping, thereby eliminating the need for water drainage equipment as a freeze prevention measure. Can do.
[0046]
  Further, even when the open / close switching valve 43 constituting the edge cutting means is in an open state and the air release valve 44 is in a closed state, the water supply primary side upstream of the water inlet circuit 4 is caused by a power failure or the like. If a negative pressure is generated, the atmosphere release valve 44 is returned to the open state by the action of the negative pressure and communicates with the atmosphere release port 441. For this reason, the said negative pressure is eliminated immediately and the backflow generation | occurrence | production resulting from the negative pressure generation from the thermal storage tank 2 side to a feed water primary side can be prevented reliably. When the open / close switching valve 43 is in the closed state, the negative pressure will not propagate if the valve is normally closed, and even if an abnormal closing operation occurs, the negative pressure causes atmospheric pressure Since the release valve is opened, it is possible to reliably prevent backflow.
[0047]
  In addition, even if the apparatus is excluded from the water supply law in this way, the hot water supply and hot water supply use through the hot water supply circuit 9 can be performed based on the supply water pressure from the incoming water circuit 4 without requiring any power. In addition, at that time, hot water is supplied based on the livestock pressure in the accumulator 93 at the initial stage when the hot water tap is opened, and then hot water is supplied based on the water pressure. If you open the door, you can immediately drain the water vigorously. Moreover, since the occurrence of hot water use is detected not by the water flow switch 95 but by the pressure switch 94, the occurrence of hot water use can be ensured even when the hot water tap is installed at the top of the heat storage tank. Can be detected.
[0048]
Second Embodiment
  FIG. 3 shows an external heat collector utilizing hot water apparatus according to a second embodiment of the present invention. This second embodiment differs from that of the first embodiment only in that a bypass circuit 14 and a manual on-off valve 15 are added, and the other components are the same as those of the first embodiment, and are the same. Constituent elements are denoted by the same reference numerals and detailed description thereof is omitted.
[0049]
  The bypass circuit 14 bypasses the opening / closing switching valve 43 by connecting the inlet circuits 4 on both upstream and downstream sides of the opening / closing switching valve 43 constituting the edge cutting means. The manual open / close valve 15 is interposed in the bypass circuit 14 and is normally kept closed. When an abnormal state occurs, the manual open / close valve 15 is manually opened to enter the water supply primary side water into the heat storage tank 2 side. It is supposed to let you.
[0050]
  By the way, if a failure occurs in the opening / closing switching valve 43 or an abnormal state in which the switching control by the controller 11 becomes impossible due to a power failure or the like, even if the user opens the hot water tap, Only hot water can be used based on the stock pressure.
[0051]
  However, in the case of this second embodiment, a user who has noticed an abnormality can manually open the on-off valve 15 to cause the water supply pressure to act on the heat storage tank 2, and an auxiliary heat source such as a water heater. Indirect use by supplying hot water to the machine and direct use of hot water from the hot water tap can be continuously obtained.
[0052]
  Here, as shown in FIG. 4, a hot water supply pipe 9a is connected in communication with the downstream end of the hot water circuit 9 of the apparatus main body 1, and this hot water supply pipe 9a is used for preheating water supply to the incoming side of the hot water heater 16 as an auxiliary heat source machine. However, when the hot water heated by the water heater 16 is supplied to the hot water tap or the like through the hot water pipe 17 when the preheated water is supplied, the water supply (hot water supply) to the water heater 16 is also stopped when the above abnormal state occurs. Will end up. In preparation for such a situation, a bypass valve 18 may be interposed between the water supply pipe 4a communicating with the upstream end of the water inlet circuit 4 and the hot water supply pipe 9a. However, the downstream side of the edge cutting means is the water supply secondary side, and direct connection with the water supply pipe 4a which is the water supply primary side is prohibited by the Water Supply Law. Therefore, when the above abnormal state occurs, the use of the water heater 16 becomes impossible. As in the second embodiment, the bypass circuit 14 and the manual on-off valve 15 are connected to an external heat collector utilizing hot water device. By providing the main body 1, it is possible to continue using the water heater 16 and continue using hot water from the hot water tap even if the abnormal state occurs.
[0053]
<Other embodiments>
  The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, in the said 1st and 2nd embodiment, although the example using the heat collector 7 which collects solar heat as an external heat collector was shown, it is not restricted to this, For example, the condenser of a heat pump, for example A heat collector that collects heat released from the heat and heat-exchange heats may be used. Even in this case, the same effect as described above can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a first embodiment of the present invention.
FIG. 2 is a block diagram showing contents of a controller according to the first embodiment.
FIG. 3 is a schematic diagram showing a second embodiment.
FIG. 4 is a schematic diagram when the second embodiment is connected to an auxiliary heat source machine.
FIG. 5 is a schematic view showing a solar-heated hot water device as a conventional hot water device using an external collector.
[Explanation of symbols]
2 heat storage tank
4 Inlet circuit
7 heat collector (external heat collector)
8 Heat collection circuit
9 Hot water circuit
10 Internal pressure release means
14 Bypass circuit
15 Manual open / close valve
43 Open / close switching valve (edge cutting means)
44 Air release valve (edge cutting means)
81 Open / close switching valve (blocking means)
84 Check valve (blocking means)
93 Accumulator (stock pressure means)
94 Pressure switch

Claims (6)

A heat storage tank that stores water as a heat storage medium and an external heat collector that collects heat and heats the water are provided, and the heat storage tank is supplied with water based on a predetermined water supply pressure to replenish the heat storage tank. While the downstream end of the water intake circuit is connected, a heat collecting operation is performed in which the water in the heat storage tank is forcibly circulated and heated between the external heat collector and the heat storage tank. In the hot water device using an external collector, in which a heat collecting circuit for performing is piped,
It is configured to include at least an open / close switching valve that is inserted in the middle of the water intake circuit and switches between entering and shutting off the water into the heat storage tank by switching between opening and closing. Edging means for edging,
An internal pressure release means attached to the heat storage tank to switch the internal pressure in the heat storage tank between an open state and a non-open state;
Bei example a shut-off means for switching to another water flow state and disconnected state between the heat storage tank in the heat collecting circuit side position than the storage tank,
After switching the shut-off means to the shut-off state and the internal pressure releasing means to the open state, the edge-cutting means is switched to the water-filled state. The heat collecting operation is performed by switching the internal pressure release means to the open state in the shut-off state and then switching the shut-off means to the water state, and the internal pressure release means is turned off in the shut-off state. A hot water supply apparatus using an external heat collector, wherein the hot water supply operation is performed so that the hot water is discharged from the heat storage tank to the hot water supply circuit by switching the edge cutting means to the incoming water state after switching to the open state. . A heat storage tank that stores water as a heat storage medium and an external heat collector that collects heat and heats the water are provided, and the heat storage tank is supplied with water based on a predetermined water supply pressure to replenish the heat storage tank. While the downstream end of the water intake circuit is connected, a heat collecting operation is performed in which the water in the heat storage tank is forcibly circulated and heated between the external heat collector and the heat storage tank. In the hot water device using an external collector, in which a heat collecting circuit for performing is piped,
It is configured to include at least an open / close switching valve that is inserted in the middle of the water intake circuit and switches between entering and shutting off water into the heat storage tank by switching between opening and closing. An edge cutting means,
An internal pressure release means attached to the heat storage tank to switch the internal pressure in the heat storage tank between an open state and a non-open state;
A shut-off means for switching between the water storage state and the shut-off state between the heat storage tank at a position closer to the heat collection circuit than the heat storage tank,
E Bei and accumulator means for releasing the upper Symbol pressure which is accumulator is interposed on the outlet hot water circuit which is tapped from the storage tank downstream of the tapping circuit is opened,
After switching the shut-off means to the shut-off state and the internal pressure releasing means to the open state, the edge-cutting means is switched to the water-filled state. The heat collecting operation is performed by switching the internal pressure release means to the open state in the shut-off state and then switching the shut-off means to the water state, and the internal pressure release means is turned off in the shut-off state. A hot water supply apparatus using an external heat collector, wherein the hot water supply operation is performed so that the hot water is discharged from the heat storage tank to the hot water supply circuit by switching the edge cutting means to the incoming water state after switching to the open state. . An external heat collector utilizing hot water device according to claim 2 ,
An external heat collector utilizing hot water apparatus further comprising a pressure switch for detecting a predetermined internal pressure drop in the tapping circuit at a downstream position of the livestock pressure means. It is an external collector utilization hot water apparatus in any one of Claims 1-3 ,
The edge cutting means closes the air supply valve at the downstream position of the open / close switching valve, shuts off the atmosphere side, returns to open by releasing the water supply pressure, and switches the atmosphere release valve to switch to communicate with the atmosphere side. A water heater using an external heat collector, which is configured. It is an external heat collecting utilization hot water apparatus according to any one of claims 1 to 4 ,
A bypass circuit that bypasses the on / off switching valve by communicating the water inlet circuits on both upstream and downstream sides sandwiching the on / off switching valve constituting the edge cutting means;
An external heat collector utilizing hot water apparatus further comprising a manual on-off valve that is manually inserted in the bypass circuit so as to manually switch between incoming water through the bypass circuit and blocking of the incoming water. It is an external heat collector utilization warm water apparatus in any one of Claims 1-5 ,
The external heat collector is a hot water apparatus using an external heat collector, which is a solar heat collector that collects solar heat.

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