JP3962753B2 - Hot water system - Google Patents

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JP3962753B2
JP3962753B2 JP2005301972A JP2005301972A JP3962753B2 JP 3962753 B2 JP3962753 B2 JP 3962753B2 JP 2005301972 A JP2005301972 A JP 2005301972A JP 2005301972 A JP2005301972 A JP 2005301972A JP 3962753 B2 JP3962753 B2 JP 3962753B2
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hot water
water supply
water
heated
temperature
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JP2006078173A (en
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道弘 清水
健一 伊東
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Takagi Industrial Co Ltd
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Description

本発明は、ホテル、病院、公共施設等で用いられる大型の給湯システムに関する。
The present invention relates to a large hot water supply system used in hotels, hospitals, public facilities, and the like.

従来の給湯装置としてはボイラーが一般的であり、ボイラーで加熱した湯水を循環ポンプで各給湯設備に循環させ、例えば各給湯設備に設けた蛇口から出湯するように構成していた。   As a conventional hot water supply apparatus, a boiler is generally used, and hot water heated by the boiler is circulated to each hot water supply facility by a circulation pump, and for example, hot water is discharged from a faucet provided in each hot water supply facility.

ところで、ホテル、病院、公共施設等で用いるボイラーは大型のものが必要であるが、大型のボイラーは出湯する湯水の温度が安定せず、また燃料使用量が多くなるという欠点を有している。   By the way, large boilers are required for hotels, hospitals, public facilities, etc., but large boilers have the disadvantages that the temperature of the hot water discharged is not stable and the amount of fuel used is increased. .

そこで、このような問題を解決するために、温度制御のしやすい容量の小さな給湯装置を複数台並設し、各給湯装置に湯水を循環しながら加熱供給するように構成した給湯システム(特許文献1)が提案されている。
特開平4−39537号公報
Therefore, in order to solve such problems, a plurality of hot water supply devices with small capacities that are easy to control the temperature are arranged side by side, and a hot water supply system configured to supply heat while circulating hot water to each hot water supply device (Patent Document) 1) has been proposed.
Japanese Patent Laid-Open No. 4-39537

しかしながら、前記給湯システムの場合、設定温度まで湯水を加熱して燃焼を停止している給湯装置の熱交換器にも常時循環湯水が流れており、非燃焼時にこの熱交換器から循環湯水の熱が外部へ逃がされてしまい、熱効率が悪く、湯水の温度低下が早いという欠点があった。このため、従来の給湯システムでは、給湯装置の燃焼と消火が頻繁に繰り返され、燃料使用量が多くなるとともに装置の傷みも早いという問題があった。   However, in the case of the hot water supply system, the circulating hot water always flows through the heat exchanger of the hot water supply apparatus that stops the combustion by heating the hot water to the set temperature. However, there is a drawback that the heat efficiency is poor and the temperature of the hot water is rapidly lowered. For this reason, in the conventional hot water supply system, combustion and extinguishing of the hot water supply device are frequently repeated, and there is a problem that the amount of fuel used is increased and the damage to the device is quick.

このような問題を解決するため、熱効率を改善して燃料使用量を低減するとともに装置の寿命を延ばし、長期間にわたって安定した湯水の供給を行なうことができる給湯システムが要望されている。   In order to solve such problems, there is a demand for a hot water supply system that can improve the thermal efficiency, reduce the amount of fuel used, extend the life of the apparatus, and supply stable hot water over a long period of time.

そこで、本発明は、複数の給湯装置を備えて効率的な運転が行える給湯システムを提供するものである。
Therefore, the present invention provides a hot water supply system that includes a plurality of hot water supply apparatuses and can perform an efficient operation.

上記課題を解決するため、本発明の給湯システムの構成は、以下の通りである。   In order to solve the above problems, the configuration of the hot water supply system of the present invention is as follows.

本発明の給湯システムの第1の側面は、複数台の給湯装置を備えて給湯する給湯システムであって、前記給湯装置によって加熱された加熱上水を循環させる循環経路と、この循環経路にバイパス管を分岐して形成され、前記加熱上水を前記給湯装置と分離して還流させる還流路と、この還流路に設置されて前記加熱上水を圧送する循環ポンプと、前記バイパス管側への前記加熱上水の分岐流量を調整し、前記加熱上水の温度が高い場合に前記バイパス管側への分岐流量を増大させる流路調整弁と、前記還流路から分岐されて前記加熱上水を出湯させる出湯口と、前記給湯装置の運転台数を切り替える制御手段とを備え、前記流路調整弁は、前記加熱上水の温度を検出して伸縮するサーモワックスエレメントと、このサーモワックスエレメントの伸縮により開度が調整される弁体とを備えることにより、前記加熱上水の温度が高い場合には、前記バイパス管側への分岐流量を増大させ、前記加熱上水の温度が低い場合には前記給湯装置の運転台数を増加させる構成である。 A first aspect of the hot water supply system of the present invention is a hot water supply system that includes a plurality of hot water supply devices to supply hot water, a circulation path that circulates heated hot water heated by the hot water supply apparatus, and a bypass to the circulation path. A reflux path formed by branching the pipe, separating the heated clean water from the hot water supply apparatus and refluxing; a circulation pump installed in the reflux path for pumping the heated clean water; and to the bypass pipe side Adjusting the branch flow rate of the heated clean water, and increasing the branch flow rate to the bypass pipe when the temperature of the heated clean water is high; includes a tap hole for tapping, and control means for switching the number of operating the water heater, the flow path adjusting valve, a thermo-wax element that expands and contracts by detecting the temperature of the heating water supply, the thermo-wax element By providing a valve body opening is adjusted by the expansion and contraction, wherein when the temperature of the heating water supply is high, the increase branching flow to the bypass pipe side, when the temperature of the heating water supply is low Is a configuration for increasing the number of operating hot water supply devices.

この給湯システムにおいて、前記加熱上水の温度が低い場合には、前記バイパス管側への分岐流量を減少させる前記流路調整弁の流量調整に応じて前記給湯装置の運転台数を変更する構成としてもよい。   In this hot water supply system, when the temperature of the heated water is low, the number of operating hot water supply devices is changed according to the flow rate adjustment of the flow path adjustment valve that reduces the branch flow rate to the bypass pipe side. Also good.

本発明の給湯システムの第2の側面は、複数台の給湯装置を備えて給湯する給湯システムであって、前記給湯装置に個別に設けられて通水を切り換える通水弁と、前記給湯装置の入水量を検出する入水量センサと、前記給湯装置の入水温度を検出する入水温センサと、前記給湯装置の出湯温度を検出する出湯温センサと、前記給湯装置に設置されてバーナの燃焼により、通水を加熱する熱交換器と、上水管に接続されて前記上水管から上水が供給されるとともに、この上水に前記給湯装置で加熱された加熱上水を合流させ、該加熱上水を前記通水弁が開かれている前記給湯装置に循環させる循環経路と、この循環経路にバイパス管を接続して形成され、前記加熱上水を前記給湯装置と分離して還流させる還流路と、この還流路から分岐されて前記加熱上水を出湯させる出湯口と、前記還流路側の前記循環経路に設置されて前記加熱上水を圧送する循環ポンプと、前記バイパス管側への前記加熱上水の分岐流量を調整し、前記加熱上水の温度が高い場合に前記バイパス管側への分岐流量を増大させる流路調整弁と、前記給湯装置に設置され、前記入水量センサの検出入水量、前記入水温センサの検出入水温度、前記出湯温センサの検出出湯温度、出湯設定温度を用いて前記バーナに供給する燃料量を演算し、その燃料量を前記バーナで燃焼させる制御部と、この制御部と連携されるとともに、前記給湯装置に供給される全入水量を用いて前記給湯装置の運転台数を演算し、その演算結果に基づいて前記通水弁を切り換えることにより、前記運転台数だけ前記給湯装置の前記制御部に運転指令を発する主制御部とを含む構成である。   A second aspect of the hot water supply system according to the present invention is a hot water supply system that includes a plurality of hot water supply devices to supply hot water, the water supply valve that is individually provided in the hot water supply device and switches water flow, and the hot water supply device An incoming water sensor for detecting the incoming water amount, an incoming water temperature sensor for detecting the incoming water temperature of the hot water supply device, a hot water temperature sensor for detecting the hot water temperature of the hot water supply device, and a combustion of a burner installed in the hot water supply device, A heat exchanger that heats the water flow, and is connected to a water supply pipe and supplied with clean water from the water supply pipe, and is combined with the heated clean water heated by the hot water supply device. A circulation path that circulates to the hot water supply device in which the water supply valve is opened, and a reflux path that is formed by connecting a bypass pipe to the circulation path and that recirculates the heated water from the hot water supply device. Branch off from this reflux path Adjusting the branch flow rate of the heated tap water to the bypass pipe side, the outlet for discharging the heated tap water, the circulation pump that is installed in the circulation path on the reflux path side and pumps the heated tap water, A flow path adjustment valve that increases a branch flow rate to the bypass pipe side when the temperature of the heated clean water is high, and a hot water supply device that is installed in the hot water supply device, and a detected incoming water amount of the incoming water sensor and a detected incoming water of the incoming water temperature sensor. The temperature, the detected hot water temperature detected by the hot water temperature sensor, the amount of fuel to be supplied to the burner using the hot water set temperature, and the control unit for burning the fuel amount in the burner, in cooperation with this control unit, By calculating the number of operating hot water supply devices using the total amount of water supplied to the hot water supply device, and switching the water flow valve based on the calculation result, the control unit of the hot water supply device has the same number as the operating number. luck A configuration including a main control unit which issues a command.

この給湯システムにおいて、前記加熱上水の温度が高い場合には、前記バイパス管側への分岐流量を増大させ、前記加熱上水の温度が低い場合には、前記バイパス管側への分岐流量を減少させる前記流路調整弁の流量調整に応じて前記給湯装置の運転台数を変更する構成としてもよい。   In this hot water supply system, when the temperature of the heated hot water is high, the branch flow rate to the bypass pipe side is increased, and when the temperature of the heated clean water is low, the branch flow rate to the bypass pipe side is increased. It is good also as a structure which changes the operation number of the said hot-water supply apparatus according to the flow volume adjustment of the said flow-path adjustment valve to reduce.

斯かる構成とすれば、加熱上水の出湯流量に応じて給湯装置の運転台数が変わるので、余分の給湯装置が無駄に燃焼されるようなことがなくなり、燃料使用量を低減することができる。   With such a configuration, the number of operating hot water supply apparatuses changes according to the amount of hot water discharged from the heated water, so that no extra hot water supply apparatus is burned unnecessarily, and the amount of fuel used can be reduced. .

また、循環経路を一巡して還流してくる加熱上水の温度が給湯装置で再加熱する必要がない程に高温の場合には、循環経路を還流する加熱上水のほとんどがバイパス管を通じてバイパスされるため、加熱上水が給湯装置へ還流されることがほとんどなくなる。このため、従来のように還流する高温の加熱上水の熱が給湯装置の熱交換器から外部へ放熱されるようなことがなくなり、循環する加熱上水の湯温低下を防止することができる。   In addition, when the temperature of heated water that circulates through the circulation path is so high that it is not necessary to reheat the hot water supply device, most of the heated water that circulates through the circulation path is bypassed through the bypass pipe. Therefore, the heated water is hardly returned to the hot water supply device. For this reason, the heat of the hot heated water that circulates as in the conventional case is not radiated to the outside from the heat exchanger of the hot water supply apparatus, and the hot water temperature that circulates can be prevented from lowering. .

これら給湯システムにおいて、前記流路調整弁は、前記バイパス管と前記循環経路との分岐部に設置された構成としてもよい。   In these hot water supply systems, the flow path adjustment valve may be installed at a branch portion between the bypass pipe and the circulation path.

これら給湯システムにおいて、前記流路調整弁は、前記加熱上水の温度を検出して伸縮するサーモワックスエレメントと、このサーモワックスエレメントの伸縮により開度が調整される弁体とを備える構成としてもよい。   In these hot water supply systems, the flow path adjustment valve may include a thermowax element that expands and contracts by detecting the temperature of the heated water, and a valve body whose opening is adjusted by the expansion and contraction of the thermowax element. Good.

斯かる構成とすれば、流路調整弁の弁開度を加熱上水の温度に応じて可変制御するための特別の制御手段や回路が全く不要となり、装置をより簡潔に構成することができる。
With such a configuration, special control means and a circuit for variably controlling the valve opening degree of the flow path adjusting valve according to the temperature of the heated water are not required, and the apparatus can be configured more simply. .

本発明によれば、次のような効果が得られる。   According to the present invention, the following effects can be obtained.

(1) 加熱上水の出湯流量に応じて給湯装置の運転台数を変えることができ、余分の給湯装置が無駄に燃焼されるようなことがなくなるため、燃料使用量を低減することができる。   (1) The number of operating hot water supply devices can be changed in accordance with the amount of hot water discharged from the heated water, and excess hot water supply devices are not burned unnecessarily, so that the amount of fuel used can be reduced.

(2) 循環経路を一巡して還流してくる加熱上水の温度が再加熱する必要がない程に高温の場合には、循環経路を還流する加熱上水のほとんどがバイパス管を通じてバイパスされるため、加熱上水が給湯装置へ還流されることが低減されて高温の加熱上水の熱が給湯装置の熱交換器から外部へ放熱されるようなことがなく、循環する加熱上水の湯温低下が防止され、熱効率が改善される。   (2) When the temperature of the heated water that circulates through the circulation path is so high that it is not necessary to reheat, most of the heated water that circulates through the circulation path is bypassed through the bypass pipe. Therefore, it is possible to reduce the return of the heated clean water to the hot water supply device, so that the heat of the hot heated clean water is not radiated from the heat exchanger of the hot water supply device to the outside, and the heated hot water that circulates. Temperature drop is prevented and thermal efficiency is improved.

(3) 燃料使用量を低減することができるとともに装置の寿命を延ばすことができ、長期間に亘って安定した湯水の供給を行なうことができる。   (3) The amount of fuel used can be reduced, the life of the apparatus can be extended, and stable hot water can be supplied over a long period of time.

(4) 流路調整弁は、加熱上水の温度を検出して伸縮するサーモワックスエレメントと、このサーモワックスエレメントの伸縮により開度が調整される弁体とを備える構成とすれば、流路調整弁の弁開度を加熱上水の温度に応じて可変制御するための特別の制御手段や回路が不要となり、装置の簡略化、低コスト化を図ることができる。
(4) If the flow path adjustment valve is configured to include a thermo wax element that expands and contracts by detecting the temperature of the heated clean water, and a valve body whose opening is adjusted by the expansion and contraction of the thermo wax element, Special control means and a circuit for variably controlling the valve opening degree of the regulating valve according to the temperature of the heated clean water are not required, and the apparatus can be simplified and the cost can be reduced.

以下、本発明の実施の形態について、図面を参照して説明する。図1に、本発明に係る給湯システムの一例を示す。なお、この図1の例は、3台の給湯装置201〜203を併設した場合の一例を示すものである。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a hot water supply system according to the present invention. In addition, the example of this FIG. 1 shows an example at the time of providing the three hot-water supply apparatuses 201-203.

図において、第1給湯装置201は、熱交換器207と、この熱交換器207を加熱するためのバーナ211とを備えている。熱交換器207の入水端は入水量センサ206、入水温センサ205を介して入水管204に接続され、熱交換器207の出湯端は出湯温センサ208、通水弁209を介して出湯管210に接続されている。また、バーナ211には燃料元弁212、燃料比例弁213を介して燃料が供給されている。   In the figure, the first hot water supply apparatus 201 includes a heat exchanger 207 and a burner 211 for heating the heat exchanger 207. The inlet end of the heat exchanger 207 is connected to the inlet pipe 204 via the incoming water amount sensor 206 and the incoming water temperature sensor 205, and the outlet end of the heat exchanger 207 is the outlet pipe 210 via the outlet water temperature sensor 208 and the water flow valve 209. It is connected to the. In addition, fuel is supplied to the burner 211 via a fuel main valve 212 and a fuel proportional valve 213.

第2給湯装置202及び第3給湯装置203も、前記第1給湯装置201と全く同様の構成になる。なお、この図1の例では、3台の給湯装置を併設したが、併設台数は使用する最大上水量に応じて決定されるものである。   The second hot water supply device 202 and the third hot water supply device 203 have the same configuration as the first hot water supply device 201. In addition, in the example of this FIG. 1, although the three hot-water supply apparatuses were installed side by side, the number of installation is determined according to the maximum amount of water to be used.

各給湯装置201〜203の入水管204はそれぞれ給水管224に接続されており、この給水管224、上水供給管223、逆止弁222、給水ポンプ221を通じて上水が供給される。   The water intake pipes 204 of the hot water supply apparatuses 201 to 203 are respectively connected to the water supply pipe 224, and clean water is supplied through the water supply pipe 224, the water supply pipe 223, the check valve 222, and the water supply pump 221.

一方、各給湯装置201〜203の出湯管210はそれぞれ給湯管226に接続されており、前記給湯管226、還流管215、循環ポンプ217、回収管220、給水管224の経路によって加熱上水が一巡して還流する循環経路が構成されている。   On the other hand, the hot water pipes 210 of the hot water supply apparatuses 201 to 203 are respectively connected to the hot water supply pipe 226, and heated hot water is supplied through the paths of the hot water supply pipe 226, the reflux pipe 215, the circulation pump 217, the recovery pipe 220, and the water supply pipe 224. A circulation path that recirculates in one cycle is configured.

給水ポンプ221は、受水槽等に貯溜された上水を所定の圧力で前記循環経路に供給するもので、前記循環経路内の加熱上水が蛇口227等から外部に取り出されたとき等に生じる圧力低下に応じて適切な量の上水を前記循環経路に補給するものである。また、前記循環経路には逆止弁214、225を設け、逆流を防止している。   The water supply pump 221 supplies clean water stored in a water receiving tank or the like to the circulation path with a predetermined pressure, and is generated when heated clean water in the circulation path is taken out from the faucet 227 or the like. An appropriate amount of clean water is replenished to the circulation path according to the pressure drop. Further, check valves 214 and 225 are provided in the circulation path to prevent backflow.

219は回収管220と還流管215を結ぶバイパス管であり、その分岐点には回収管220側に還流する流量とバイパス管219側に分流する流量を調節する流路調整弁218が設けられている。   Reference numeral 219 denotes a bypass pipe connecting the recovery pipe 220 and the reflux pipe 215, and a flow path adjusting valve 218 for adjusting the flow rate of reflux to the recovery pipe 220 side and the flow volume of the shunt to the bypass pipe 219 side is provided at the branch point. Yes.

なお、各給湯装置単体には所定温度まで加熱して出湯することのできる最大有効出湯量があり、給湯システム全体として必要な最大出湯量を満足させるに足る台数の給湯装置が併設される。例えば、給湯装置単体の最大有効出湯量が10リットル/分であり、給湯システム全体としての必要な最大出湯量が30リットル/分であれば、給湯装置は図示したように3台併設されることになる。   Each hot water supply device has a maximum effective amount of hot water that can be heated to a predetermined temperature and discharged, and a number of hot water supply devices sufficient to satisfy the maximum amount of hot water required for the entire hot water supply system are provided. For example, if the maximum effective hot water discharge amount of a single hot water supply device is 10 liters / minute and the required maximum hot water discharge amount for the entire hot water supply system is 30 liters / minute, three hot water supply devices are provided as shown. become.

また、循環ポンプ217にて循環させる上水の循環流量は、3台の給湯装置201〜203が一斉に燃焼を繰り返してその燃料使用量が増大することを防止するために、通常3台の給湯装置のうちの1台または2台が動作する程度の流量で循環させる。この循環する加熱上水は循環経路内を循環するのみであるため、放熱による損失を補う程度に加熱されればよい。   In addition, the circulation flow rate of the clean water circulated by the circulation pump 217 is usually three hot water supplies in order to prevent the three hot water supply apparatuses 201 to 203 from simultaneously burning and increasing the amount of fuel used. Circulate at a flow rate that allows one or two of the devices to operate. Since this circulating heated water only circulates in the circulation path, it may be heated to the extent that it compensates for the loss due to heat dissipation.

また、蛇口227等から外部に上水が出湯された場合は、循環経路内の圧力損失が開放されて流量規制が解除されるので、外部への出湯量に応じて新しい上水が給水ポンプ221によって補給され、さらにこの時の出湯流量に見合う台数の給湯装置が動作される。   When tap water is discharged from the faucet 227 or the like, the pressure loss in the circulation path is released and the flow rate restriction is released, so that new tap water is supplied to the feed pump 221 in accordance with the amount of hot water discharged to the outside. Then, a number of hot water supply apparatuses corresponding to the hot water flow rate at this time are operated.

図2は、前記給湯システム200の電気回路のブロック図である。主制御装置300は装置全体の動作を制御するもので、各給湯装置201〜203の制御部301〜303と、外部リモコン装置304が接続されている。主制御装置300は、各制御部301〜303から送られてくる温度、水量等の検出データを受け取り、各制御部301〜303に動作指令を与える。各制御部301〜303は、この動作指令に基づき、それぞれの給湯装置の通水弁209、燃料元弁212、燃料比例弁213等に駆動指令を与える。   FIG. 2 is a block diagram of an electric circuit of the hot water supply system 200. Main control device 300 controls the operation of the entire device, and is connected to control units 301 to 303 of hot water supply devices 201 to 203 and external remote control device 304. The main control device 300 receives detection data such as temperature and water amount sent from the respective control units 301 to 303, and gives operation commands to the respective control units 301 to 303. Based on this operation command, each control unit 301 to 303 gives a drive command to the water flow valve 209, the fuel main valve 212, the fuel proportional valve 213, and the like of each hot water supply device.

図3は、前記主制御装置300及び外部リモコン装置304の詳細なブロック図である。主制御装置300には、CPU310、インターフェース用のI/O装置311、データや各種情報を一時記憶するためのRAM312、全体の動作を制御する制御プログラムや各種制御データが格納されたROM313、故障警告データ等を格納するためのEEPROM314が設けられている。さらに、I/O装置311には、各制御部301〜303との間でデータの送受を行なう送受信装置315〜317、外部リモコン装置304との間で通信を行なうための送受信回路318が接続されている。   FIG. 3 is a detailed block diagram of the main controller 300 and the external remote controller 304. The main control device 300 includes a CPU 310, an I / O device 311 for interface, a RAM 312 for temporarily storing data and various information, a ROM 313 storing a control program and various control data for controlling the entire operation, and a failure warning. An EEPROM 314 for storing data and the like is provided. Further, the I / O device 311 is connected with transmission / reception devices 315 to 317 for transmitting / receiving data to / from each of the control units 301 to 303 and a transmission / reception circuit 318 for performing communication with the external remote control device 304. ing.

外部リモコン装置304には、CPU320、I/O装置321、RAM322、CPU320を動作させるためのプログラムが格納されているROM323が設けられている。さらにI/O装置321には、運転スイッチ327のための起動回路324、上水の温度を設定する温度設定スイッチ328のための温度設定回路325、設定温度、各種故障警報等の情報を報知する表示装置329を駆動するための表示回路326が接続されている。   The external remote control device 304 is provided with a CPU 320, an I / O device 321, a RAM 322, and a ROM 323 in which a program for operating the CPU 320 is stored. Further, the I / O device 321 is notified of information such as a startup circuit 324 for the operation switch 327, a temperature setting circuit 325 for the temperature setting switch 328 for setting the temperature of the clean water, a set temperature, various failure alarms, and the like. A display circuit 326 for driving the display device 329 is connected.

図4は、給湯装置201(202、203)の制御部301(302、303)の詳細なブロック図である。制御部301(302、303)には、CPU330、I/O装置331、CPU330に接続されたA/D変換器332、333、データや各種情報を一時記憶するためのRAM334、動作を制御する制御プログラムや各種制御データが格納されたROM335が設けられている。A/D変換器332、333には、入水管204から熱交換器207に流入する上水の温度を検出する入水温センサ205と、熱交換器207から出湯管210に出湯される加熱後の上水の温度を検出するための出湯温センサ208が接続されている。   FIG. 4 is a detailed block diagram of the control unit 301 (302, 303) of the hot water supply apparatus 201 (202, 203). The control unit 301 (302, 303) includes a CPU 330, an I / O device 331, A / D converters 332 and 333 connected to the CPU 330, a RAM 334 for temporarily storing data and various information, and a control for controlling operations. A ROM 335 in which programs and various control data are stored is provided. The A / D converters 332 and 333 include an incoming water temperature sensor 205 that detects the temperature of clean water flowing into the heat exchanger 207 from the incoming water pipe 204, and a heated water that is discharged from the heat exchanger 207 to the hot water outlet pipe 210. A hot water temperature sensor 208 for detecting the temperature of the clean water is connected.

I/O装置331には、通水弁209を駆動する通水弁駆動回路336、燃料元弁212を駆動する燃料元弁駆動回路337、燃料比例弁213を駆動する燃料比例弁駆動回路338、入水量センサ206で検出した熱交換器207への流量信号を制御に適した波形信号に変換する波形整形回路339、主制御装置300との間でデータの送受を行なう送受信回路340が接続されている。   The I / O device 331 includes a water valve driving circuit 336 for driving the water valve 209, a fuel main valve driving circuit 337 for driving the fuel main valve 212, a fuel proportional valve driving circuit 338 for driving the fuel proportional valve 213, A waveform shaping circuit 339 for converting a flow rate signal to the heat exchanger 207 detected by the incoming water sensor 206 into a waveform signal suitable for control, and a transmission / reception circuit 340 for transmitting / receiving data to / from the main controller 300 are connected. Yes.

次に、前記構成からなる給湯システム200の動作を説明する。まず、主制御装置300は、第1給湯装置201に動作指令を出す。第1給湯装置201の制御部301は、この動作指令によって通水弁209を開かせる。すると給水管224、入水管204を通って上水が熱交換器207に入水され、出湯管210より出水される。この上水の流入を入水量センサ206にて検出し、バーナ211の点火動作に移行するとともに、検出した入水量を主制御装置300に送信する。   Next, the operation of the hot water supply system 200 having the above configuration will be described. First, main controller 300 issues an operation command to first hot water supply apparatus 201. The control part 301 of the 1st hot water supply apparatus 201 opens the water flow valve 209 by this operation command. Then, the clean water enters the heat exchanger 207 through the water supply pipe 224 and the water inlet pipe 204 and is discharged from the hot water outlet pipe 210. This inflow of clean water is detected by the incoming water amount sensor 206, and the operation proceeds to the ignition operation of the burner 211, and the detected incoming water amount is transmitted to the main controller 300.

主制御装置300は、第1給湯装置201から送られてくる入水量を基に動作させるべき給湯装置の台数を演算する。例えば、給湯装置1台の最大有効出湯量が10リットル/分で入水量が30リットル/分の場合には、3台の給湯装置を駆動する必要があると判断し、第2給湯装置202、第3給湯装置203にも運転指令を送信する。これにより、第2給湯装置202と第3給湯装置203も運転を開始する。   Main controller 300 calculates the number of hot water supply devices to be operated based on the amount of incoming water sent from first hot water supply device 201. For example, when the maximum effective hot water discharge amount of one hot water supply device is 10 liters / minute and the incoming water amount is 30 liters / minute, it is determined that it is necessary to drive three hot water supply devices, and the second hot water supply device 202, An operation command is also transmitted to the third hot water supply device 203. Thereby, the 2nd hot-water supply apparatus 202 and the 3rd hot-water supply apparatus 203 also start operation.

主制御装置300から設定温度が各給湯装置の制御部301、302、303に送信され、各制御部はその設定温度をRAM334に格納し、それぞれにて検出される入水温度、入水量、出湯温度と記憶された設定温度とを基にそれぞれのバーナ211に供給する燃料量を演算し、各燃料比例弁213の開度を調整して上水を加熱する。設定温度まで加熱された各給湯装置の上水は、それぞれ出湯管210より出湯し、給湯管226、還流管215、循環ポンプ217、回収管220の循環経路を通って一巡し、再び各給湯装置に還流される。   A set temperature is transmitted from the main control device 300 to the control units 301, 302, and 303 of each hot water supply device, and each control unit stores the set temperature in the RAM 334, and the detected incoming water temperature, incoming water amount, and outgoing hot water temperature. The amount of fuel supplied to each burner 211 is calculated based on the stored preset temperature and the opening of each fuel proportional valve 213 is adjusted to heat the clean water. The hot water of each hot water supply apparatus heated to the set temperature is discharged from the hot water supply pipe 210, makes a round through the circulation path of the hot water supply pipe 226, the reflux pipe 215, the circulation pump 217, and the recovery pipe 220, and again each hot water supply apparatus. To reflux.

さて、循環上水が設定温度にまで昇温すると、各給湯装置201〜203は燃焼を停止して待機状態になるが、循環ポンプ217による循環量はほぼ一定に保たれているため、主制御装置300は各給湯装置の制御部301〜303に対して通水弁209を開くように命令を出し続けている。このため、設定温度まで昇温した上水は必ず各熱交換器207を通過して循環することになるが、この熱交換器を通過することにより逆に上水の熱が多量に外部に放出されてしまい、上水の温度は短時間のうちに低下してしまう。   Now, when the circulating water is heated to the set temperature, each of the hot water supply apparatuses 201 to 203 stops combustion and enters a standby state. However, since the circulation amount by the circulation pump 217 is kept substantially constant, the main control is performed. The device 300 continues to issue commands to open the water flow valve 209 to the control units 301 to 303 of each hot water supply device. For this reason, the water that has been heated to the set temperature circulates through each heat exchanger 207, but by passing through this heat exchanger, a large amount of heat from the water is released to the outside. As a result, the temperature of clean water drops within a short time.

この結果、各バーナ211は点火と停止を頻繁に繰り返し、加熱のための燃料消費量が多大になってしまうとともに、湯水が常に熱交換器を通るため、熱交換器に腐食等が発生しやすくなる。そこで、本発明では循環経路にバイパス管219と流路調整弁218を設け、循環する上水の温度に応じて循環する上水を還流管215側へバイパスするように構成している。   As a result, each burner 211 is repeatedly ignited and stopped frequently, and the amount of fuel consumed for heating becomes large, and since hot water always passes through the heat exchanger, corrosion or the like is likely to occur in the heat exchanger. Become. Therefore, in the present invention, the bypass pipe 219 and the flow path adjustment valve 218 are provided in the circulation path so that the circulated upper water is bypassed to the reflux pipe 215 side according to the temperature of the circulated upper water.

前記流路調整弁218は、図5に示すように、熱によって膨張・収縮するワックスを封入したサーモワックスエレメント350と、このサーモワックスエレメント350を内蔵した感熱部351と、押圧バネ355とを備え、感熱部351の外周には分流量を調整するための2つの弁体353、354が形成されている。そして、例えば前記サーモワックスエレメント350として55℃〜75℃の範囲で膨張・収縮するものを用い、給湯装置の設定温度を65℃に設定し、感熱部351にて感熱する温度が65℃を越えてくると感熱部351が上方へ移動し、65℃よりも低下してくると感熱部351が下方へ移動するように、調整ネジ356を調整する。   As shown in FIG. 5, the flow path adjusting valve 218 includes a thermo wax element 350 in which wax that expands and contracts by heat is sealed, a heat-sensitive portion 351 in which the thermo wax element 350 is built, and a pressing spring 355. Two valve bodies 353 and 354 for adjusting the partial flow rate are formed on the outer periphery of the heat sensitive part 351. For example, the thermo-wax element 350 that expands and contracts in the range of 55 ° C. to 75 ° C. is used. Then, the adjustment screw 356 is adjusted so that the thermal part 351 moves upward, and when the temperature is lower than 65 ° C., the thermal part 351 moves downward.

弁内を通過する上水によって感熱部351が温められると、サーモワックスエレメント350が膨張してその先端の突き出しピン352が調整ねじ356を押し、押圧バネ355に抗して感熱部351を上方へ押し上げる。一方、上水の温度が低下すると、サーモワックスエレメント350が収縮してその突き出しピン352が引っ込み、押圧バネ355によって感熱部351を下方へ押し下げる。   When the heat sensitive part 351 is warmed by the clean water passing through the valve, the thermowax element 350 expands, and the protruding pin 352 at the tip pushes the adjusting screw 356, and the heat sensitive part 351 is moved upward against the pressing spring 355. Push up. On the other hand, when the temperature of the clean water decreases, the thermo wax element 350 contracts and the protruding pin 352 retracts, and the heat-sensitive portion 351 is pushed downward by the pressing spring 355.

したがって、上水の温度が上昇すれば、弁体354側が開いてA方向の流量が増え、上水の温度が低下すれば、弁体353側が開いてB方向への流量が増える。さらに、全ての給湯装置201〜203の燃焼が停止される程度まで上水の温度が高い場合には、循環される上水のほとんどが流路調整弁218でバイパスされ、回収管220側の流量が減少する。このため、高温時には上水の熱が熱交換器207から外部へ逃がされるようなことがなくなり、せっかく加熱した上水の温度が急激に低下するというようなことがなくなる。   Accordingly, if the temperature of the clean water rises, the valve body 354 side opens and the flow rate in the A direction increases, and if the temperature of the clean water decreases, the valve body 353 side opens and the flow rate in the B direction increases. Furthermore, when the temperature of the clean water is high enough to stop the combustion of all the hot water supply apparatuses 201 to 203, most of the circulated clean water is bypassed by the flow path adjustment valve 218, and the flow rate on the recovery pipe 220 side Decrease. For this reason, at the time of high temperature, the heat of the clean water is not released from the heat exchanger 207 to the outside, and the temperature of the heated clean water is not suddenly decreased.

前記の点についてさらに詳しく説明すると、給湯装置201〜203で加熱されて上水の温度が上昇すると、前記流路調整弁218の作用によって給湯装置201〜203に還流される上水量が減少する。主制御装置300は、各給湯装置の入水量センサ206からの合計流量を演算し、合計入水量が10リットル/分未満まで低下したら、第2及び第3給湯装置202、203の通水弁209を閉じて第2及び第3給湯装置202、203を停止させ、第1給湯装置201だけで加熱する。   The above point will be described in more detail. When the temperature of the hot water rises due to heating by the hot water supply devices 201 to 203, the amount of the hot water returned to the hot water supply devices 201 to 203 is reduced by the action of the flow path adjustment valve 218. The main controller 300 calculates the total flow rate from the incoming water amount sensor 206 of each hot water supply device, and when the total incoming water amount decreases to less than 10 liters / minute, the water flow valves 209 of the second and third hot water supply devices 202 and 203 are used. Is closed, the second and third hot water supply devices 202 and 203 are stopped, and only the first hot water supply device 201 is heated.

そして、第1給湯装置201には循環する上水の温度と水量を入水温センサ205と入水量センサ206で常時検出させるために、上水の温度が設定温度に達してその燃焼を停止させる場合でも、通水弁209は閉止しないで開けたままにしておく。   In the first hot water supply apparatus 201, in order to constantly detect the temperature and amount of the circulated fresh water with the incoming water temperature sensor 205 and the incoming water amount sensor 206, the temperature of the upper water reaches the set temperature and the combustion is stopped. However, the water valve 209 is left open without closing.

やがて循環する上水の温度が低下してくると、流路調整弁218はB方向への還流量を増大させる。第1給湯装置201の入水量センサ206で検出される水量が10リットル/分以上になると、第2給湯装置202が動作される。さらに、外部への出湯等によって出湯量が増え、第1及び第2給湯装置201、202にて検出される合計水量が20リットル/分以上に増加したら、第3給湯装置203も動作させる。このようにして、燃料消費量を可能な限り少なくしながら、上水を効率的に加熱することができる。
When the temperature of the circulated water decreases over time, the flow path adjustment valve 218 increases the amount of reflux in the B direction. When the amount of water detected by the incoming water amount sensor 206 of the first hot water supply apparatus 201 becomes 10 liters / minute or more, the second hot water supply apparatus 202 is operated. Further, when the amount of hot water is increased due to external hot water, and the total amount of water detected by the first and second hot water supply devices 201 and 202 is increased to 20 liters / minute or more, the third hot water supply device 203 is also operated. In this way, clean water can be efficiently heated while minimizing fuel consumption.

本発明の給湯システムは、複数の給湯装置の運転台数を給湯需要に応じて調整でき、ホテル、病院、公共施設等の大型の給湯システムに適用できる。
The hot water supply system of the present invention can adjust the number of operating hot water supply apparatuses according to hot water supply demand, and can be applied to large hot water supply systems such as hotels, hospitals, and public facilities.

本発明に係る給湯システムの一例を示す図である。It is a figure which shows an example of the hot water supply system which concerns on this invention. 給湯システムの電気回路を示すブロック図である。It is a block diagram which shows the electric circuit of a hot water supply system. 主制御装置及び外部リモコン装置の詳細な構成を示すブロック図である。It is a block diagram which shows the detailed structure of a main controller and an external remote controller. 給湯装置の制御部の構成を示すブロック図である。It is a block diagram which shows the structure of the control part of a hot water supply apparatus. 流路調整弁の構造を示す断面図である。It is sectional drawing which shows the structure of a flow-path adjustment valve.

符号の説明Explanation of symbols

200 給湯システム
201〜203 給湯装置
204 入水管
205 入水温センサ
206 入水量センサ
207 熱交換器
208 出湯温センサ
209 通水弁
210 出湯管
211 バーナ
215 還流管
217 循環ポンプ
218 流路調整弁
219 バイパス管
220 回収管
221 給水ポンプ
223 上水供給管
224 給水管
226 給湯管
227 蛇口
300 主制御装置
301、302、303 給湯装置制御部
304 外部リモコン装置
350 サーモワックスエレメント
DESCRIPTION OF SYMBOLS 200 Hot-water supply system 201-203 Hot-water supply apparatus 204 Inlet pipe 205 Incoming water temperature sensor 206 Incoming water amount sensor 207 Heat exchanger 208 Outlet water temperature sensor 209 Water supply valve 210 Outlet pipe 211 Burner 215 Reflux pipe 217 Circulation pump 218 Channel adjustment valve 219 Bypass pipe 220 Recovery pipe 221 Water supply pump 223 Water supply pipe 224 Water supply pipe 226 Hot water supply pipe 227 Faucet 300 Main controller 301, 302, 303 Hot water supply controller 304 External remote controller 350 Thermo wax element

Claims (6)

複数台の給湯装置を備えて給湯する給湯システムであって、
前記給湯装置によって加熱された加熱上水を循環させる循環経路と、
この循環経路にバイパス管を分岐して形成され、前記加熱上水を前記給湯装置と分離して還流させる還流路と、
この還流路に設置されて前記加熱上水を圧送する循環ポンプと、
前記バイパス管側への前記加熱上水の分岐流量を調整し、前記加熱上水の温度が高い場合に前記バイパス管側への分岐流量を増大させる流路調整弁と、
前記還流路から分岐されて前記加熱上水を出湯させる出湯口と、
前記給湯装置の運転台数を切り替える制御手段と、
を備え、前記流路調整弁は、前記加熱上水の温度を検出して伸縮するサーモワックスエレメントと、このサーモワックスエレメントの伸縮により開度が調整される弁体とを備えることにより、前記加熱上水の温度が高い場合には、前記バイパス管側への分岐流量を増大させ、前記加熱上水の温度が低い場合には前記給湯装置の運転台数を増加させることを特徴とする給湯システム。
A hot water supply system for supplying hot water with a plurality of hot water supply devices,
A circulation path for circulating the heated water heated by the hot water supply device;
A reflux path formed by branching a bypass pipe in this circulation path, and separating the heated clean water from the hot water supply apparatus,
A circulation pump installed in the reflux path for pumping the heated water;
Adjusting the branch flow rate of the heated clean water to the bypass pipe side, and increasing the branch flow rate to the bypass pipe side when the temperature of the heated clean water is high;
A hot water outlet that branches off from the reflux path to discharge the heated water;
Control means for switching the number of operating water heaters;
The flow path adjustment valve includes a thermowax element that expands and contracts by detecting the temperature of the heated clean water, and a valve body whose opening degree is adjusted by the expansion and contraction of the thermowax element. A hot water supply system that increases a branch flow rate to the bypass pipe side when the temperature of the hot water is high, and increases the number of operating hot water supply devices when the temperature of the heated hot water is low.
複数台の給湯装置を備えて給湯する給湯システムであって、
前記給湯装置に個別に設けられて通水を切り換える通水弁と、
前記給湯装置の入水量を検出する入水量センサと、
前記給湯装置の入水温度を検出する入水温センサと、
前記給湯装置の出湯温度を検出する出湯温センサと、
前記給湯装置に設置されてバーナの燃焼により、通水を加熱する熱交換器と、
上水管に接続されて前記上水管から上水が供給されるとともに、この上水に前記給湯装置で加熱された加熱上水を合流させ、該加熱上水を前記通水弁が開かれている前記給湯装置に循環させる循環経路と、
この循環経路にバイパス管を接続して形成され、前記加熱上水を前記給湯装置と分離して還流させる還流路と、
この還流路から分岐されて前記加熱上水を出湯させる出湯口と、
前記還流路側の前記循環経路に設置されて前記加熱上水を圧送する循環ポンプと、
前記バイパス管側への前記加熱上水の分岐流量を調整し、前記加熱上水の温度が高い場合に前記バイパス管側への分岐流量を増大させる流路調整弁と、
前記給湯装置に設置され、前記入水量センサの検出入水量、前記入水温センサの検出入水温度、前記出湯温センサの検出出湯温度、出湯設定温度を用いて前記バーナに供給する燃料量を演算し、その燃料量を前記バーナで燃焼させる制御部と、
この制御部と連携されるとともに、前記給湯装置に供給される全入水量を用いて前記給湯装置の運転台数を演算し、その演算結果に基づいて前記通水弁を切り換えることにより、前記運転台数だけ前記給湯装置の前記制御部に運転指令を発する主制御部と、
を含むことを特徴とする給湯システム。
A hot water supply system for supplying hot water with a plurality of hot water supply devices,
A water flow valve individually provided in the hot water supply device for switching water flow;
An incoming water amount sensor for detecting an incoming water amount of the hot water supply device;
An incoming water temperature sensor for detecting an incoming water temperature of the hot water supply device;
A hot water temperature sensor for detecting a hot water temperature of the hot water supply device;
A heat exchanger that is installed in the hot water supply device and heats water through combustion of a burner;
Connected to a water pipe and supplied with water from the water pipe, the heated water heated by the hot water supply device is joined to the water, and the water supply valve is opened. A circulation path for circulation to the hot water supply device;
A reflux path formed by connecting a bypass pipe to the circulation path, and separating the heated clean water from the hot water supply apparatus,
A hot water outlet that branches off from the reflux path and discharges the heated water.
A circulation pump that is installed in the circulation path on the reflux path side and pumps the heated clean water;
Adjusting the branch flow rate of the heated clean water to the bypass pipe side, and increasing the branch flow rate to the bypass pipe side when the temperature of the heated clean water is high;
The amount of fuel supplied to the burner is calculated using the detected water input amount of the incoming water amount sensor, the detected incoming water temperature of the incoming water temperature sensor, the detected outgoing hot water temperature of the outgoing hot water temperature sensor, and the outgoing hot water set temperature. A control unit for burning the fuel amount in the burner;
In cooperation with this control unit, the number of operating water heaters is calculated using the total amount of water supplied to the water heater, and the number of operating units is switched by switching the water flow valves based on the calculation result. A main control unit that issues an operation command only to the control unit of the hot water supply device;
A hot water supply system characterized by including.
請求項1の給湯システムにおいて、
前記加熱上水の温度が低い場合には、前記バイパス管側への分岐流量を減少させる前記流路調整弁の流量調整に応じて前記給湯装置の運転台数を変更することを特徴とする給湯システム。
The hot water supply system according to claim 1,
When the temperature of the heated water is low, the number of operating hot water supply devices is changed in accordance with the flow rate adjustment of the flow path adjustment valve that reduces the branch flow rate to the bypass pipe side. .
請求項2の給湯システムにおいて、
前記加熱上水の温度が高い場合には、前記バイパス管側への分岐流量を増大させ、前記加熱上水の温度が低い場合には、前記バイパス管側への分岐流量を減少させる前記流路調整弁の流量調整に応じて前記給湯装置の運転台数を変更することを特徴とする給湯システム。
The hot water supply system according to claim 2,
The flow path for increasing the branch flow rate to the bypass pipe side when the temperature of the heated clean water is high, and decreasing the branch flow rate to the bypass pipe side when the temperature of the heated clean water is low. A hot water supply system, wherein the number of operating hot water supply devices is changed in accordance with the flow rate adjustment of an adjusting valve.
請求項1又は2の給湯システムにおいて、
前記流路調整弁は、前記バイパス管と前記循環経路との分岐部に設置されたことを特徴とする給湯システム。
In the hot water supply system according to claim 1 or 2,
The hot water supply system, wherein the flow path adjustment valve is installed at a branch portion between the bypass pipe and the circulation path.
請求項2の給湯システムにおいて、
前記流路調整弁は、
前記加熱上水の温度を検出して伸縮するサーモワックスエレメントと、
このサーモワックスエレメントの伸縮により開度が調整される弁体と、
を備えることを特徴とする給湯システム。
The hot water supply system according to claim 2 ,
The flow path adjustment valve is
A thermowax element that expands and contracts by detecting the temperature of the heated water,
A valve body whose opening is adjusted by expansion and contraction of the thermo wax element;
A hot water supply system comprising:
JP2005301972A 2005-10-17 2005-10-17 Hot water system Expired - Lifetime JP3962753B2 (en)

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