JP3648897B2 - Flow rate detector - Google Patents

Flow rate detector Download PDF

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Publication number
JP3648897B2
JP3648897B2 JP35878096A JP35878096A JP3648897B2 JP 3648897 B2 JP3648897 B2 JP 3648897B2 JP 35878096 A JP35878096 A JP 35878096A JP 35878096 A JP35878096 A JP 35878096A JP 3648897 B2 JP3648897 B2 JP 3648897B2
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Japan
Prior art keywords
hot water
flow rate
bathtub
detecting
flow
Prior art date
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JP35878096A
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Japanese (ja)
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JPH10185636A (en
Inventor
久二 御立
雅典 東内
功 青木
吉彦 金山
由弘 近森
英也 小原
明 堤
伸啓 市坪
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Noritz Corp
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Noritz Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、流量検出装置に関し、特に複数の通路の流れを簡単な構成で検出する流量検出装置に関する。
【0002】
【従来の技術】
従来この種の技術としては、例えば図5に示したようなものが存在する。このようなものでは、給湯側から浴槽へ湯水を落とし込む落とし込み給湯路44上に水流センサ45を設けて、浴槽に落とし込む流量を監視するようになっている。また、浴槽の湯を追い焚き用熱交換器32で追い焚き加熱する際には、追い焚き用循環路33で循環加熱し、その循環路33の水量を検出するときには循環路33に別途水量センサを配置し、また単に循環路33に水流スイッチ36を設け、その水流スイッチのオン・オフにより浴槽の湯水が循環しているかどうかを確認するようにしていた。
【0003】
【発明が解決しようとする課題】
しかしながら従来のものでは、浴槽に落とし込まれる落とし込み流量を検出したり、また浴槽の湯を追い焚き用循環路にて循環する循環流量を検出したり、あるいは浴槽の湯が追い焚き用循環路にて循環しているかどうか循環の有無を検出したりする場合には、検出する箇所の増加に伴いセンサが増加するため部材が増加し、そのための配線等も増加して機器が大型化し、また複雑化する問題が生じていた。
【0004】
そこで、本発明は1つの流量センサを用いて複数の通路の流量の検出、あるいは流れの有無の検出を可能として部材の低減、構造の簡略化を実現した流量検出装置の提供を目的とする。
【0005】
【課題を解決するための手段】
上記目的を達成するために、請求項1記載の発明は、三方向の通路が互いに交わって接続した箇所に、それら三方向の通路のそれぞれにまたがるように設けられた羽根車と、この羽根車の回転を検出するための回転検出手段と、を備えていることを特徴とする。
【0006】
請求項2記載の発明は、浴槽の湯を取り出し熱交換器に送ると共に、前記熱交換器を通して前記浴槽に戻す循環路と、この循環路に接続されて前記浴槽に湯水を落とし込むための落とし込み給湯路とを備えたものであって、前記循環路と前記落とし込み給湯路との接続部にその双方の通路に跨がって設けられた羽根車、およびこの羽根車の回転を検出するための回転検出手段を有する流量センサと、前記浴槽に湯水を落とし込む動作中には前記流量センサの検出出力に基づいて落とし込み流量を検出する一方、前記循環路にて前記浴槽の湯を循環させる動作中には前記流量センサの検出出力に基づいて循環流量または循環の有無を検出する流量検出制御手段と、を具備していることを特徴とする。
【0007】
請求項1記載の発明によれば、羽根車と回転検出手段とを備えている一つの流量センサで複数の流路の流れ状態検出される。
【0008】
請求項2記載の発明によれば、一つの流量センサからの検出出力に基づいて、流量検出制御手段は浴槽への落とし込み動作の際にはその落とし込み流量を検出し、循環路にて循環動作をする際にはその循環流量または循環の有無を検出する。
【0009】
【発明の実施の形態】
図1は本発明を用いた給湯装置の全体構成図である。
【0010】
先ず図1の給湯装置の全体を説明する。10は浴槽で、20は給湯用燃焼器、30は追い焚き用燃焼器である。
前記浴槽10には排水栓11が設けられ、また追い焚き循環用の接続口をなす循環金具12が浴槽10側壁の真ん中よりも少し下の位置に設けられている。前記循環金具12を通ってフロ自動落とし込み給湯も行われる。
前記追い焚き用燃焼器30には追い焚き用バーナ31が設けられ、また、追い焚き用熱交換器32が設けられている。該追い焚き用熱交換器32と前記浴槽10の循環金具12との間に追い焚き用循環路33が設けられ、該追い焚き用循環路33には、水圧センサからなる浴槽水位センサ34、循環ポンプ35、流量検出装置としての流量検出ユニット70等が設けられている。
【0011】
前記給湯用燃焼器20には給湯用バーナ21が設けられ、また給湯用熱交換器22が設けられている。該給湯用熱交換器22には入水路23が接続され、入水路23には入水流量センサ24、入水温度センサ25が設けられている。また前記給湯用熱交換器22には出湯路26が接続され、出湯路26には出湯温度センサ27が設けられている。前記入水路23からは混水調節器29を有するバイパス28が出湯路26に接続し、その合流点より下流が給湯路40となされている。給湯路40には水量調節器41と給湯温度センサ42とが設けられている。前記給湯路40は途中で一般給湯路43と浴槽への落とし込み給湯路44とに分岐している。
【0012】
前記落とし込み給湯路44は前記追い焚き用循環路33の途中に接続せられており、その途中にバキュームブレーカ46、落とし込み電磁弁47、逆止弁48、流量検出ユニット70を設けている。
50は装置全体の制御を行うコントローラで、60はリモコンである。コントローラ50はマイコンを内蔵し、リモコン60からの指令を受け、また給湯器各部のセンサ類からの情報を入力し、所定のソフトウエアに従って演算、判定、記憶を行い、また給湯器各部に動作指令を出す。
【0013】
フロ自動落とし込みは、浴槽の設定水位がリモコン60等において設定され、自動落とし込み運転スイッチがリモコン等においてオンせられることによって行われる。落とし込み電磁弁47が開かれることで、給湯側の出湯路26、落とし込み給湯路44を経てきた温水或いは非加熱水が、追い焚き用循環路33に入り、追い焚き用循環路33を通って循環金具12から浴槽10に導入される。
前記フロ自動落とし込み運転において、浴槽10内に温水或いは非加熱水が順調に落とし込まれ、設定水位になった場合には、フロ自動落とし込みは終了する。
【0014】
次に図2を用いて流量検出装置としての流量検出ユニット70について詳細に説明する。図2(A)が構造を示した正面図であり、図2(B)がその側面図である。流量検出ユニット70は図2に示すように、落とし込み給湯路44側と接続される接続口71、追い焚き用循環路33であって浴槽10側と接続される接続口72、及び追い焚き用循環路33であって追い焚き用熱交換器32側と接続される接続口73の3つの接続口を有している。また、落とし込み給湯路44側と接続される接続口71側から、電磁弁74、逆止弁75が配置され、接続口71、72、73からの通路と交わるように流量センサとしての羽根車76が設けられている。そして、羽根車76と対応するような位置に羽根車76の回転を検出するために、例えば磁気センサ等の回転検出手段77が設けられ、流量検出ユニット内に流れる流量を検出する。
【0015】
具体的には、フロ落とし込みの際には落とし込み給湯路44側の接続口71から湯水が流入され接続口72、73から浴槽に落とし込まれる。このとき羽根車76の回転を回転検出手段77が検出し浴槽に落とし込まれる流量を検出する。またその際、温度センサ78が浴槽に落とし込まれる温度を検出監視している。追い焚き循環の際には浴槽側の接続口72から流入された浴槽の湯が熱交換器32側の接続口73から流出され、そのときの流れにより羽根車76を回転し、回転検出手段77によって循環流量を検出する。また、その際、温度センサ78が流れる湯の温度を検出することにより浴槽の湯の温度を検出している。
【0016】
次に図3を用いて本発明の制御構成について説明する。コントローラ50は、給湯制御手段51、追い焚き制御手段52、流量検出制御手段53、及びその他の制御手段54を有しており、各種センサ77、78等と接続されていると共に各種駆動部35等に指令を出している。また、このコントローラ50にはリモコン60が接続されており、このリモコン60により遠隔操作ができるようになっている。まず、給湯制御手段51は、給湯動作を制御するものであり、一般給湯路43側に所望の温度の湯を提供したり、落とし込み給湯路44を通して浴槽10に所望の湯を提供したりするために、給湯燃焼器20による燃焼動作等を制御する手段である。追い焚き制御手段52は、浴槽の湯の追い焚き加熱を制御するものであり、浴槽内の湯の温度が低下したりあるいはリモコン60側からの追焚操作があると循環ポンプ35を駆動して浴槽内の湯を追い焚き用循環路33に循環させて、追い焚き用燃焼器30にて追い焚き加熱を行う。このとき温度センサ78により浴槽の温度を検出監視している。
【0017】
流量検出制御手段53は、給湯制御手段51による浴槽への給湯動作の際に浴槽に落とし込む流量を検出したり、追い焚き制御手段52による追い焚き動作の際に浴槽の湯を循環する追い焚き用循環路33に循環する循環流量等を検出制御する手段である。すなわち、浴槽への給湯動作の際には、流量検出ユニット70の回転検出手段77の入力信号により落とし込み給湯路44から落とし込まれる流量を検出する。また、追焚動作の際には、流量検出ユニット70の回転検出手段77の入力信号により追い焚き循環路33の循環流量を検出する。その他の制御手段54は、上述以外の制御を行っており、例えばセンサ類の監視制御やリモートコントローラ60との伝送制御等を行っている。
【0018】
以上のように構成することにより、一つの流量センサで複数の通路、すなわち浴槽に落とし込む通路及び追い焚き循環路の通路の流量を検出することができる。
なお、上記実施形態においては、流量検出装置を給湯器に用いた場合について説明したが、それ以外の流量を検出する必要のある機器についても適用することができるのは勿論のことである。
また、上記実施形態においては、流量検出装置は流量を検出する場合について主として説明したが水流スイッチとして用いることもできる。例えば回転検出手段77が所定以上の回転を検出すれば流量有りと判断し、それに満たなければ流量無しと判断すればよい。
【0019】
また、上記実施形態において、図2に流量検出ユニットの構造の一例を詳細に示したが、これに限定されるものではなく、複数の流路の流量を検出できるようにしたものであればよい。例えば図4に示すような構造でもよい。これは図2と比較して接続口の位置が異なるものであり、配管の状態に応じて適宜変更するようにしてもよいのは勿論のことである。
【0020】
また、上記実施形態において、回転検出手段77は磁気センサを用いているが、光学式の回転検出や、機械式の回転検出等でもよく、流量を検出できるものであればよい。
【0021】
【発明の効果】
以上説明したように本発明では、一つの流量センサを用いて複数の流路の流量(あるいは流量の有無)を検出し得るようにしたので、流量センサを増加することなく複数の流路の流れ状態を検出することができる効果がある。
また、フロ落とし込み給湯路とフロ追い焚き用循環路との接続部にその双方にまたがるように流量センサを配置したので、浴槽に湯水を落とし込む際には流量センサにて落とし込み流量を検出でき、浴槽の湯を循環路にて循環する際にはその流量センサで循環流量(あるいは循環の有無)を検出することができる効果がある。
【図面の簡単な説明】
【図1】流量検出装置が用いられた給湯器の概要説明図である。
【図2】流量検出ユニットの構成図である。
【図3】給湯器の制御構成図である。
【図4】流量検出ユニットの他の構成図である。
【図5】従来の説明図である。
【符号の説明】
10 浴槽
12 循環金具
20 給湯用燃焼器
30 追い焚き用燃焼器
33 追い焚き用循環路
34 水位センサ
35 循環ポンプ
44 落とし込み給湯路
50 コントローラ
51 給湯制御手段
52 追い焚き制御手段
53 流量検出制御手段
60 リモコン
70 流量検出ユニット
76 羽根車
77 回転検出手段
78 温度センサ
80 他の流量検出ユニット
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow rate detection device, and more particularly to a flow rate detection device that detects a flow of a plurality of passages with a simple configuration.
[0002]
[Prior art]
Conventionally, as this type of technology, for example, the one shown in FIG. 5 exists. In such a thing, the water flow sensor 45 is provided on the dropping hot water supply path 44 which drops hot water into the bathtub from the hot water supply side, and the flow volume dropped into the bathtub is monitored. Further, when the hot water in the bathtub is reheated by the reheating heat exchanger 32, it is heated by recirculation in the recirculation circuit 33, and when detecting the amount of water in the recirculation path 33, a separate water amount sensor is provided in the recirculation path 33. In addition, a water flow switch 36 is simply provided in the circulation path 33, and whether or not hot water in the bathtub is circulating is confirmed by turning on and off the water flow switch.
[0003]
[Problems to be solved by the invention]
However, in the conventional system, the flow rate dropped into the bathtub is detected, the circulating flow rate of circulating hot water in the bathtub is detected in the recirculation circuit, or the hot water in the bathtub is added to the recirculation circuit. When detecting the presence or absence of circulation, the number of sensors increases as the number of detection points increases, so the number of members increases, the wiring for that increases, and the equipment becomes larger and complicated. There was a problem.
[0004]
Accordingly, an object of the present invention is to provide a flow rate detection device that can detect the flow rate of a plurality of passages using a single flow rate sensor, or can detect the presence or absence of a flow, thereby reducing the number of members and simplifying the structure.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is directed to an impeller provided at a location where the three-way passages cross and connect with each other, and straddles each of the three-way passages, and the blades. And a rotation detecting means for detecting the rotation of the vehicle .
[0006]
The invention according to claim 2, and sends to the heat exchanger is taken out the hot water of the bathtub, a circulation path for returning to said bath through said heat exchanger, to Translate the hot water in the bathtub is connected to the circulation path An impeller provided with a dropping hot water supply path , and an impeller provided across the both passages at a connection portion between the circulation path and the dropping hot water supply path , and rotation of the impeller of a flow sensor having a rotation detecting means, while during operation Translate the hot water in the tub for detecting the flow rate darken based on the detection output of the flow sensor, in operation causes circulating hot water of the bathtub in the circulation path characterized in that it comprises a and a flow rate detection control means for detecting the circulation flow rate or existence of circulating based on the detection output of the flow sensor to.
[0007]
According to the first aspect of the present invention, the flow states of the plurality of flow paths are detected by the single flow rate sensor including the impeller and the rotation detection unit .
[0008]
According to the second aspect of the invention, based on the detection output from one flow rate sensor, the flow rate detection control means detects the dropped flow rate when dropping into the bathtub and circulates in the circulation path. when the detects the existence of the circulating flow or circulation.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall configuration diagram of a hot water supply apparatus using the present invention.
[0010]
First, the whole hot water supply apparatus of FIG. 1 will be described. 10 is a bathtub, 20 is a hot water combustor, and 30 is a reheating combustor.
The bathtub 10 is provided with a drain plug 11 and a circulation fitting 12 that forms a connection port for recirculation is provided at a position slightly below the middle of the side wall of the bathtub 10. Flow automatic hot water supply through the circulating metal fitting 12 is also performed.
The reheating combustor 30 is provided with a reheating burner 31 and a reheating heat exchanger 32. A reheating circulation path 33 is provided between the reheating heat exchanger 32 and the circulation fitting 12 of the bathtub 10, and the reheating circulation path 33 includes a bathtub water level sensor 34 including a water pressure sensor, and a circulation. A pump 35, a flow rate detection unit 70 as a flow rate detection device, and the like are provided.
[0011]
The hot water supply combustor 20 is provided with a hot water supply burner 21 and a hot water supply heat exchanger 22. A water inlet 23 is connected to the hot water heat exchanger 22, and a water inlet flow sensor 24 and a water inlet temperature sensor 25 are provided in the water inlet 23. A hot water supply passage 26 is connected to the hot water supply heat exchanger 22, and a hot water temperature sensor 27 is provided in the hot water supply passage 26. A bypass 28 having a mixed water regulator 29 is connected to the hot water outlet 26 from the water inlet 23, and a hot water supply path 40 is provided downstream from the junction. The hot water supply passage 40 is provided with a water amount adjuster 41 and a hot water supply temperature sensor 42. The hot water supply path 40 is branched into a general hot water supply path 43 and a dropping hot water supply path 44 into the bathtub.
[0012]
The dropping hot water supply path 44 is connected in the middle of the recirculation circulation path 33, and a vacuum breaker 46, a dropping electromagnetic valve 47, a check valve 48, and a flow rate detection unit 70 are provided in the middle.
50 is a controller for controlling the entire apparatus, and 60 is a remote controller. The controller 50 has a built-in microcomputer, receives a command from the remote controller 60, inputs information from sensors of each part of the water heater, performs calculation, determination and storage according to predetermined software, and also gives an operation command to each part of the water heater. Put out.
[0013]
Flow automatic drop is performed by setting the set water level of the bathtub with the remote controller 60 or the like and turning on the automatic drop operation switch with the remote controller or the like. When the dropping solenoid valve 47 is opened, hot water or non-heated water passing through the hot water supply side 26 and the dropping hot water supply path 44 enters the recirculation circulation path 33 and circulates through the recirculation circulation path 33. It is introduced from the metal fitting 12 into the bathtub 10.
In the automatic flow dropping operation, when the warm water or non-heated water is smoothly dropped into the bathtub 10 and reaches the set water level, the automatic flow dropping ends.
[0014]
Next, the flow rate detection unit 70 as the flow rate detection device will be described in detail with reference to FIG. FIG. 2A is a front view showing the structure, and FIG. 2B is a side view thereof. As shown in FIG. 2, the flow rate detection unit 70 has a connection port 71 connected to the dropping hot water supply channel 44 side, a connection port 72 that is the recirculation circuit 33 for reheating and connected to the bathtub 10 side, and recirculation for reheating. The passage 33 has three connection ports, a connection port 73 connected to the reheating heat exchanger 32 side. In addition, an electromagnetic valve 74 and a check valve 75 are arranged from the connection port 71 side connected to the dropped hot water supply passage 44 side, and an impeller 76 as a flow rate sensor intersects the passage from the connection ports 71, 72, 73. Is provided. In order to detect the rotation of the impeller 76 at a position corresponding to the impeller 76, for example, rotation detection means 77 such as a magnetic sensor is provided to detect the flow rate flowing in the flow rate detection unit.
[0015]
Specifically, when the floor is dropped, hot water is introduced from the connection port 71 on the dropping hot water supply path 44 side and dropped into the bathtub from the connection ports 72 and 73. At this time, the rotation detecting means 77 detects the rotation of the impeller 76 and detects the flow rate dropped into the bathtub. At that time, the temperature sensor 78 detects and monitors the temperature dropped into the bathtub. During the recirculation circulation, the hot water in the bathtub that has flowed in from the connection port 72 on the bathtub side flows out from the connection port 73 on the heat exchanger 32 side, and the impeller 76 is rotated by the flow at that time, so that rotation detection means 77 is detected. To detect the circulation flow rate. At that time, the temperature of the hot water in the bathtub is detected by detecting the temperature of the hot water flowing through the temperature sensor 78.
[0016]
Next, the control configuration of the present invention will be described with reference to FIG. The controller 50 includes a hot water supply control means 51, a reheating control means 52, a flow rate detection control means 53, and other control means 54, and is connected to various sensors 77, 78 and the like, and various drive units 35 and the like. Is instructed. A remote controller 60 is connected to the controller 50 so that the remote controller 60 can be operated remotely. First, the hot water supply control means 51 controls the hot water supply operation, and provides hot water having a desired temperature to the general hot water supply passage 43 side or provides the desired hot water to the bathtub 10 through the dropped hot water supply passage 44. In addition, it is means for controlling the combustion operation and the like by the hot water supply combustor 20. The reheating control means 52 controls reheating heating of the hot water in the bathtub, and drives the circulation pump 35 when the temperature of the hot water in the bathtub decreases or when there is a reheating operation from the remote control 60 side. Hot water in the bathtub is circulated in the recirculation circuit 33 and reheating is performed in the reheating combustor 30. At this time, the temperature sensor 78 detects and monitors the temperature of the bathtub.
[0017]
The flow rate detection control means 53 detects the flow rate dropped into the bathtub during the hot water supply operation to the bathtub by the hot water supply control means 51, or for reheating the hot water in the bathtub during the reheating operation by the reheating control means 52. This is means for detecting and controlling the circulation flow rate circulating in the circulation path 33. That is, during the hot water supply operation to the bathtub, the flow rate dropped from the hot water supply passage 44 is detected by the input signal of the rotation detection means 77 of the flow rate detection unit 70. Further, during the chasing operation, the circulating flow rate of the chasing circulation path 33 is detected by the input signal of the rotation detecting means 77 of the flow rate detecting unit 70. The other control means 54 performs controls other than those described above, for example, monitoring control of sensors, transmission control with the remote controller 60, and the like.
[0018]
By configuring as described above, it is possible to detect the flow rates of a plurality of passages, that is, the passage dropped into the bathtub and the passage of the recirculation circuit with one flow rate sensor.
In addition, in the said embodiment, although the case where the flow volume detection apparatus was used for the hot water heater was demonstrated, it is needless to say that it is applicable also to the apparatus which needs to detect the flow volume other than that.
Moreover, in the said embodiment, although the flow volume detection apparatus mainly demonstrated the case where the flow volume was detected, it can also be used as a water flow switch. For example, if the rotation detecting means 77 detects a predetermined rotation or more, it is determined that there is a flow rate.
[0019]
Moreover, in the said embodiment, although an example of the structure of the flow volume detection unit was shown in detail in FIG. 2, it is not limited to this, What is necessary is just to enable it to detect the flow volume of several flow paths. . For example, a structure as shown in FIG. 4 may be used. This is different from FIG. 2 in the position of the connection port, and needless to say, it may be changed as appropriate according to the state of the piping.
[0020]
In the above embodiment, the rotation detecting unit 77 uses a magnetic sensor. However, optical rotation detection, mechanical rotation detection, or the like may be used as long as the flow rate can be detected.
[0021]
【The invention's effect】
As described above, in the present invention, since the flow rate (or the presence / absence of flow rate) of a plurality of flow paths can be detected using a single flow rate sensor, the flow of the plurality of flow paths is increased without increasing the flow rate sensor. There is an effect that the state can be detected.
In addition, since the flow rate sensor is arranged so as to extend over the connecting part of the flow dropping hot water supply channel and the flow recirculation circuit, when the hot water is dropped into the bathtub, the flow rate sensor can detect the dropped flow rate. When circulating hot water in the circulation path, the flow rate sensor (or the presence or absence of circulation) can be detected by the flow rate sensor.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of a water heater in which a flow rate detection device is used.
FIG. 2 is a configuration diagram of a flow rate detection unit.
FIG. 3 is a control configuration diagram of a water heater.
FIG. 4 is another configuration diagram of the flow rate detection unit.
FIG. 5 is a conventional explanatory diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bath 12 Circulation metal fitting 20 Hot-water supply combustor 30 Reheating combustor 33 Reheating circulation path 34 Water level sensor 35 Circulation pump 44 Dropping hot-water supply path 50 Controller 51 Hot-water supply control means 52 Reheating control means 53 Flow rate detection control means 60 Remote control 70 Flow rate detection unit 76 Impeller 77 Rotation detection means 78 Temperature sensor 80 Other flow rate detection unit

Claims (2)

三方向の通路が互いに交わって接続した箇所に、それら三方向の通路のそれぞれにまたがるように設けられた羽根車と、この羽根車の回転を検出するための回転検出手段と、を備えていることを特徴とする流量検出装置。 An impeller provided so as to straddle each of the three-way passages and a rotation detecting means for detecting the rotation of the impeller are provided at a place where the three-way passages cross and connect with each other. A flow rate detecting device characterized by that. 浴槽の湯を取り出し熱交換器に送ると共に、前記熱交換器を通して前記浴槽に戻す循環路と、この循環路に接続されて前記浴槽に湯水を落とし込むための落とし込み給湯路とを備えたものであって、
前記循環路と前記落とし込み給湯路との接続部にそれら双方の通路にまたがって設けられた羽根車、およびこの羽根車の回転を検出するための回転検出手段を有する流量センサと、
前記浴槽に湯水を落とし込む動作中には前記流量センサの検出出力に基づいて落とし込み流量を検出する一方、前記循環路にて前記浴槽の湯を循環させる動作中には前記流量センサの検出出力に基づいて循環流量または循環の有無を検出する流量検出制御手段と
を具備していることを特徴とする流量検出装置。
Remove the hot water bath and sends to the heat exchanger, a circulation path for returning to said bath through said heat exchanger, which was a darken hot water path for dropping the hot water in the bathtub is connected to the circulation path There,
A flow rate sensor having a rotation detecting means for detecting the rotation of the impeller provided in a connecting portion between the circulation path and the dropping hot water supply path across both the passages; and
While the during operation Translate the hot water in the tub for detecting the flow rate darken based on the detection output of the flow sensor, the during operation causes circulating hot water of the bathtub in the circulation path based on the detection output of the flow sensor a flow rate detection control means for detecting the circulation flow rate or existence of circulating Te,
Flow rate detecting apparatus characterized in that it comprises a.
JP35878096A 1996-12-26 1996-12-26 Flow rate detector Expired - Fee Related JP3648897B2 (en)

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