JP6504516B2 - Hot water storage type electric water heater - Google Patents

Hot water storage type electric water heater Download PDF

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JP6504516B2
JP6504516B2 JP2014217003A JP2014217003A JP6504516B2 JP 6504516 B2 JP6504516 B2 JP 6504516B2 JP 2014217003 A JP2014217003 A JP 2014217003A JP 2014217003 A JP2014217003 A JP 2014217003A JP 6504516 B2 JP6504516 B2 JP 6504516B2
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water storage
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storage tank
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匠示 岸本
匠示 岸本
桂介 金▲崎▼
桂介 金▲崎▼
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Toto Ltd
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Description

本発明は、温度制御手段の故障時等に加熱ヒーターへの通電を遮断する温度過昇防止器を備える貯湯式電気温水器に関する発明である。   The present invention is an invention relating to a hot water storage type electric water heater provided with a temperature overheat prevention device that shuts off the current supply to the heater when the temperature control means fails.

従来の貯湯式電気温水器では、特許文献１に示すように、手動復帰式バイメタル式のサーモスタットで構成される温度過昇防止器を備え、温度制御手段の故障や貯湯タンク内に水が無い状態での加熱による異常な温度上昇を防いでいた。一旦、温度過昇防止器が作動してしまうと、再通電を行うためには、温度過昇防止器に設けられたリセットスイッチを押してリセット操作を行う必要があり、その都度、メンテナンス業者へ依頼する必要があった。   As shown in Patent Document 1, the conventional hot water storage type electric water heater is provided with a temperature overheat prevention device composed of a manual reset type bimetal type thermostat, and there is no failure in the temperature control means or no water in the hot water storage tank. Abnormal temperature rise due to heating in Once the overheat protection device has been activated, it is necessary to press the reset switch provided on the overheat protection apparatus to perform a reset operation in order to re-energize. I needed to.

特開平１１−１３２５６６号公報Japanese Patent Application Laid-Open No. 11-132566

従来の貯湯式電気温水器は以上のように構成されているので、一旦、手動復帰式バイメタルが作動すると、再通電を行うためにはメンテナンス業者へ依頼する必要があり、非常に手間がかかる。そのため、通常の沸き上げ動作では温度過昇防止器が作動することがなく、異常加熱時のみに作動するように、沸き上げ温度と温度過昇防止器の作動温度との間に所定のマージンを持たせている。   Since the conventional hot water storage type electric water heater is configured as described above, once the manual reset type bimetal operates, it is necessary to request a maintenance contractor to perform reenergization, which is very time-consuming. Therefore, in the normal boiling operation, the overheat protector does not operate, and a predetermined margin is set between the boiling temperature and the operating temperature of the overheat protector so that it operates only during abnormal heating. I have it.

時に、飲料用途の貯湯式電気温水器には、一旦、湯をジャーポットへ注いでの使用の他に、例えばカップラーメンやコーヒー、お茶等へ直接湯を注いで使用されることもあり、沸き上げ温度が高いことが求められる。対応として、温度制御手段による沸き上げ温度を高くするとともに、温度過昇防止器の作動温度を高くすることが考えられるが、密閉構造の貯湯式電気温水器においては、温度制御手段が故障した際の貯湯タンク内の湯温が百度以下であることが法律（電気用品安全法）で求められている。そのため、温度過昇防止器の作動温度を高くすることにも限界があり、沸き上げ温度を思うように高くできないという問題があった。   Sometimes, in addition to the use of pouring hot water into a jar pot, it is sometimes used by pouring hot water directly into cup ramen, coffee, tea, etc. The elevated temperature is required to be high. As a countermeasure, it is conceivable to raise the boiling temperature by the temperature control means and raise the operating temperature of the overheat protection device, but in the case of the storage type electric water heater of the closed structure, when the temperature control means breaks down. It is required by law (the Electrical Appliances and Materials Safety Act) that the temperature of the hot water in the hot water storage tank is below 100 ° C. Therefore, there is a limit to raising the operating temperature of the overheat protection device, and there is a problem that the boiling temperature can not be increased as desired.

本発明は、上記のような問題を解決するためになされたもので、貯湯タンク内の湯水の沸き上げる温度を極力高くしながら、温度制御手段が故障した場合であっても、貯湯タンク内の湯温を百度以下に維持しつつ、再通電を行うためにメンテナンス業者へ依頼する必要がなくなる貯湯式電気温水器を提供することを目的とする。   The present invention has been made to solve the above-described problems, and it is possible to increase the boiling temperature of hot water in the hot water storage tank as much as possible, even if the temperature control means fails, in the hot water storage tank. It is an object of the present invention to provide a hot water storage type electric water heater which eliminates the need for requesting a maintenance company to perform reenergization while maintaining the hot water temperature at or below the temperature.

本発明の貯湯式電気温水器では、湯水を貯湯する貯湯タンクと、前記貯湯タンクの下方に備えられ前記貯湯タンク内の湯水を加熱する加熱ヒーターと、前記貯湯タンク内の湯水を設定された沸き上げ温度に加熱するために前記加熱ヒーターへの通電を制御する温度制御手段と、前記貯湯タンク内の湯水の温度が前記沸き上げ温度より高い第一の温度になった時に前記加熱ヒーターをオフする自動復帰式バイメタルである第一の温度過昇防止器と、前記貯湯タンク内の湯水の温度が前記第一の温度より高い第二の温度になった時に前記加熱ヒーターをオフする手動復帰式バイメタルである第二の温度過昇防止器と、を備え、前記第一の温度過昇防止器と前記第二の温度過昇防止器は前記貯湯タンクの外表面の上方に近接して配置され、前記第一の温度過昇防止器は前記第二の温度過昇防止器の上側に配置されていることを特徴とする。 In the water storage type electric water heater of the present invention, a water storage tank for storing hot water, a heater provided below the water storage tank for heating the water in the water storage tank, and a boiling point set for the water in the water storage tank. Temperature control means for controlling energization of the heater for heating to a raised temperature, and turning off the heater when the temperature of the hot water in the hot water storage tank reaches a first temperature higher than the boiling temperature manual reset type to turn off the pressurized heat heater when the first thermal cut-out device is automatic return bimetal, the temperature of hot water in the hot water storage tank reaches a second temperature higher than said first temperature And a second overheat protector that is bimetal , wherein the first overheat protector and the second overheat protector are disposed in proximity to an upper surface of the hot water storage tank. , Said first Overheat protector is characterized in that it is arranged on the upper side of the second overheat protector.

このような構成とすれば、第一の温度過昇防止器が自動復帰式バイメタル式のサーモスタットで構成されているので、万一、通常の沸き上げ動作において、異常ではないのに何らかの理由で沸き上げ温度が上昇し、温度過昇防止器が作動しても自動的に復帰するので、リセット操作をメンテナンス業者へ依頼する必要はなく、そのまま継続して使用することができる。そのため、沸き上げ温度と温度過昇防止器の作動温度との間のマージンを少なくすることができ、沸き上げ温度を上げることができる。   With such a configuration, since the first overheat protection device is configured by the self-resetting type bimetal type thermostat, in the case of normal boiling operation, although it is not abnormal, boiling is caused for some reason. Since the temperature rise rises and the temperature overheat protector is automatically activated even if it is activated, there is no need to ask the maintenance contractor for a reset operation, and it can be used as it is. Therefore, the margin between the boiling temperature and the operating temperature of the overheat protector can be reduced, and the boiling temperature can be raised.

また、貯湯タンク内に水が無い状態での加熱（空焚き）による異常な温度上昇が発生した場合は、第一の温度過昇防止器が作動して加熱ヒーターへの通電を遮断しても、余熱による温度上昇により第二の温度過昇防止器も作動するため、空焚きを繰り返すことがない。この場合は、第二の温度過昇防止器に設けられたリセットスイッチを押してリセット操作を行う必要があり、メンテナンス業者へ依頼することになる。   In addition, if an abnormal temperature rise occurs due to heating (open air) with no water in the hot water storage tank, even if the first overheat prevention device operates to cut off the current to the heater Since the second overheat protection device also operates due to the temperature rise due to the residual heat, the air-heating is not repeated. In this case, it is necessary to press the reset switch provided on the second overheat protection device to perform the reset operation, and a maintenance contractor is requested.

また、前記第一の温度過昇防止器と前記第二の温度過昇防止器とが前記貯湯タンクの外表面に配置されているので、第一の温度過昇防止器と第二の温度過昇防止器とが貯湯タンク内の湯水の温度を伝えやすい部位の温度を検出することになり、第一の温度過昇防止器及び第二の温度過昇防止器が検出する温度と貯湯タンク内の湯水の温度との差を少なくすることができるとともに、熱の伝わり方が同じ部位の温度を検出しているため、第一の温度過昇防止器を第二の温度過昇防止器より確実に早く作動させることができる。 In addition, since the first overheat protector and the second overheat protector are disposed on the outer surface of the hot water storage tank, the first overheat protector and the second overheat are disposed. The rising prevention device detects the temperature of the part where it is easy to transmit the temperature of the hot and cold water in the hot water storage tank, and the temperature detected by the first overheat protection device and the second overtemperature protection device and inside the hot water storage tank The difference between the temperature and the temperature of the water can be reduced, and since the heat transfer method detects the temperature of the same part, the first overheat protector is more reliable than the second overheat protector. Can be operated quickly.

さらに、前記第一の温度過昇防止器が前記第二の温度過昇防止器の上側に配置されているので、貯湯タンクの上部ほど湯水の温度が高いため、第一の温度過昇防止器を第二の温度過昇防止器より確実に早く作動させることができる。 Furthermore, since the first overheat protection device is disposed on the upper side of the second overheat protection apparatus, the temperature of the hot water is higher toward the top of the hot water storage tank, so the first overheat protection apparatus is Can be operated faster than the second overheat protector.

また、本発明の貯湯式電気温水器では、前記第一の温度は、百度以下であることを特徴とする。   Further, in the water storage type electric water heater according to the present invention, the first temperature is equal to or less than 100 degrees.

このような構成とすれば、温度制御手段が故障した際の貯湯タンク内の湯温を百度以下に維持できる。   With such a configuration, it is possible to maintain the temperature of the hot water in the hot water storage tank at the time of failure of the temperature control means at or below the temperature of 100 ° C.

本発明により、貯湯タンク内の湯水の沸き上げる温度を極力高くしながら、温度制御手段が故障した場合であっても、貯湯タンク内の湯温を百度以下に維持しつつ、再通電を行うためにメンテナンス業者へ依頼する必要がなくなる貯湯式電気温水器を提供することができる。   According to the present invention, reheating can be performed while maintaining the temperature of the hot water in the hot water storage tank at a temperature equal to or less than 100 ° C., even if the temperature control means fails while increasing the boiling temperature of hot water in the hot water storage tank as much as possible. It is possible to provide a hot water storage type electric water heater which eliminates the need for asking a maintenance contractor.

本発明の貯湯式電気温水器の正面図である。It is a front view of the hot water storage type electric water heater of this invention. 本発明の貯湯式電気温水器の内観図である。It is an interior view of the hot water storage type electric water heater of this invention. 本発明の実施形態の貯湯式電気温水器における回路図である。It is a circuit diagram in a hot water storage type electric water heater of an embodiment of the present invention. 本発明の実施形態の温度過昇防止器の作動温度領域を示す図である。It is a figure which shows the operating temperature area | region of the overheat prevention device of embodiment of this invention.

以下、本発明の貯湯式電気温水器について図を用いて説明する。
図１は本発明の貯湯式電気温水器の正面図である。 Hereinafter, the hot water storage type electric water heater of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a hot water storage type electric water heater of the present invention.

図１に示すように、貯湯式電気温水器１は、シンク７の上方の壁面に設置されており、同じく壁面に設置された水栓２と排水パイプ３へ、それぞれ出湯配管（図示しない）と排水配管（図示しない）で接続されている。   As shown in FIG. 1, the hot water storage type electric water heater 1 is installed on the wall surface above the sink 7, and the hot water outlet piping (not shown) to the faucet 2 and the drainage pipe 3 similarly installed on the wall surface. It is connected by drainage piping (not shown).

また、貯湯式電気温水器１は、ここでは図示しない止水栓と給水配管（図示しない）で接続されるとともに、電源コンセント６と電源コード５で接続されている。なお、止水栓（図示しない）からは水栓２へも給水配管（図示しない）が接続されている。   In addition, the hot water storage type electric water heater 1 is connected with a water stop valve (not shown) and a water supply pipe (not shown), and connected with a power outlet 6 and a power cord 5. A water supply pipe (not shown) is also connected to the faucet 2 from a water stop valve (not shown).

さらに、貯湯式電気温水器１には沸き上げスイッチや温度設定スイッチ等（図示しない）が設けられた操作盤４が備えられている。   Furthermore, the storage water type electric water heater 1 is provided with a control panel 4 provided with a heating switch, a temperature setting switch and the like (not shown).

貯湯式電気温水器１内の貯湯タンク（図示しない）へは止水栓（図示しない）より給水配管（図示しない）を通じて上水が供給される。   Water is supplied to a hot water storage tank (not shown) in the hot water storage type electric water heater 1 through a water supply pipe (not shown) from a water stop valve (not shown).

そして、貯湯式電気温水器１に備えられた操作盤４に設けられた沸き上げスイッチ（図示しない）を入りにすることにより、貯湯式電気温水器１内の貯湯タンク（図示しない）の湯水が温度制御手段（図示しない）によって加熱ヒーター（図示しない）が制御され、所定の加熱設定温度Ｔ１まで沸き上げられる。   And, by turning on the heating switch (not shown) provided on the operation panel 4 provided in the hot water storage type electric water heater 1, the hot water of the hot water storage tank (not shown) in the hot water storage type electric water heater 1 is A heater (not shown) is controlled by a temperature control means (not shown) and is heated to a predetermined heating set temperature T1.

所定温度まで沸き上げられた湯水は、出湯配管（図示しない）を経由して水栓２より吐出される。   Hot and cold water heated to a predetermined temperature is discharged from the faucet 2 through a hot water outlet pipe (not shown).

また、沸き上げの際に発生する膨張水は、排水配管（図示しない）を経由して排水パイプ３より排出される。   Further, the expanded water generated at the time of boiling is discharged from the drainage pipe 3 via a drainage pipe (not shown).

図２は本発明の貯湯式電気温水器の内観図である。この図２は、図１の貯湯式電気温水器１の前面カバーを取り外して内部を露出した状態を示している。   FIG. 2 is an interior view of the hot water storage type electric water heater of the present invention. This FIG. 2 has shown the state which removed the front cover of the hot water storage type electric water heater 1 of FIG. 1, and exposed the inside.

貯湯式電気温水器１の内部には貯湯タンク８が備えられている。また、沸き上げスイッチ９や温度設定スイッチ等（図示しない）が設けられた操作盤４も備えられている。   A hot water storage tank 8 is provided inside the hot water storage type electric water heater 1. Moreover, the control panel 4 in which the boiling switch 9 and a temperature setting switch etc. (not shown) were provided is also provided.

また、貯湯タンク８の下方には貯湯タンク８内の湯水を加熱する加熱ヒーター１０が備えられるとともに、貯湯タンク８の外表面にはサーミスターで構成される温度検出手段１１が取り付けられ、検出された温度をもとに温度制御部１５によって貯湯タンク８内の湯水を予め操作盤４の温度設定スイッチ（図示しない）で設定された加熱設定温度Ｔ１に沸き上げるために、加熱ヒーター１０への通電を制御する。   In addition, a heater 10 for heating the hot and cold water in the hot water storage tank 8 is provided below the hot water storage tank 8, and a temperature detection unit 11 composed of a thermistor is attached to the outer surface of the hot water storage tank 8. In order to boil the hot and cold water in the hot water storage tank 8 to the heating setting temperature T1 previously set by the temperature setting switch (not shown) of the operation panel 4 based on the stored temperature, the heater 10 is energized. Control.

さらに、貯湯タンク８の上方の外表面には、温度検出手段１１と温度制御部１５で構成される温度制御手段が故障して貯湯タンク８の外表面が加熱設定温度Ｔ１を超えて上昇した時に、加熱ヒーター１０への通電を遮断する第一の温度過昇防止器１３と第二の温度過昇防止器１４とが近接して備えられている。   Furthermore, when the temperature control means composed of the temperature detection means 11 and the temperature control unit 15 fails on the outer surface above the hot water storage tank 8 and the outer surface of the hot water storage tank 8 rises above the heating set temperature T1. A first overheat protection device 13 and a second overheat protection device 14 are provided in close proximity to each other to cut off the current supply to the heater 10.

ここで、第一の温度過昇防止器１３は自動復帰式バイメタル式のサーモスタットで構成され、第二の温度過昇防止器１４は手動復帰式バイメタル式のサーモスタットで構成され、第一の温度過昇防止器１３は第二の温度過昇防止器１４の上方に位置する。なお、第一の温度過昇防止器１３の作動温度Ｔ２は、第二の温度過昇防止器１４の作動温度Ｔ３より低く設定されている。   Here, the first overheat protector 13 is constituted by an automatic return bimetal thermostat, and the second overheat protector 14 is constituted by a manual return bimetal thermostat. The riser 13 is located above the second overtemperature protector 14. The operating temperature T2 of the first overheat protection device 13 is set to be lower than the operating temperature T3 of the second overheat protection device 14.

さらに、前記二つの温度過昇防止器の両方が故障した場合の対応として、加熱ヒーター１０への通電を遮断する温度ヒューズ１２が同じく貯湯タンク８の上方の外表面に備えられている。なお、温度ヒューズ１２の作動温度Ｔ４は第二の温度過昇防止器１４の作動温度Ｔ３より高く設定されている。   Furthermore, as a countermeasure in case both of the two overheat protection devices fail, a thermal fuse 12 for interrupting the energization of the heater 10 is also provided on the outer surface above the hot water storage tank 8. The operating temperature T4 of the thermal fuse 12 is set higher than the operating temperature T3 of the second overheat protection device 14.

なお、本実施例では、第一の温度過昇防止器１３を第二の温度過昇防止器１４の上方に位置させたが、参考例として、作動温度Ｔ２、Ｔ３を調節することにより第一の温度過昇防止器を第二の温度過昇防止器より確実に早く作動させることができる範囲において、その位置関係は上下逆あるいは同じ高さでもよい。また、近接した位置関係でなくてもよく、さらには、第一の温度過昇防止器１３と第二の温度過昇防止器１４の両方を、あるいはいずれか一方を加熱ヒーター１０のフランジの表面部分に設けてもよい。
In the present embodiment, the first overheat protector 13 is located above the second overheat protector 14. However, as a reference example , the first overheat protector 13 is adjusted by adjusting the operating temperatures T2 and T3. The positional relationship may be upside down or the same height as long as the overheat protection device of the present invention can be operated reliably earlier than the second overheat protection device. Also, they need not be in close positional relationship, and furthermore, both of the first overheat protection device 13 and the second overheat protection device 14 or one of them may be the surface of the flange of the heater 10 You may provide in the part.

図３は本発明の実施形態の貯湯式電気温水器における回路図である。   FIG. 3 is a circuit diagram of a hot water storage type electric water heater according to an embodiment of the present invention.

前記電源コンセントより電源コードを介して供給される電源１６に対し、沸き上げスイッチ９と、加熱ヒーター１０と、温度制御部１５と、温度ヒューズ１２と、自動復帰式バイメタル式のサーモスタットで構成される第一の温度過昇防止器１３と、手動復帰式バイメタル式のサーモスタットで構成される第二の温度過昇防止器１４と、が直列に接続されている。   The power supply 16 supplied from the power supply outlet through the power supply cord comprises a heating switch 9, a heating heater 10, a temperature control unit 15, a temperature fuse 12, and a thermostat of an automatic reset type bimetal type. A first overheat protection device 13 and a second overheat protection device 14 configured of a manual reset bimetal thermostat are connected in series.

温度制御部１５は、操作盤４の温度設定スイッチ（図示しない）で設定された加熱設定温度Ｔ１と前記温度検出手段１１による検出温度をもとに、リレーの接点の開閉や、トライアック等の半導体素子を駆動させることにより、加熱ヒーター１０への通電を制御する。   The temperature control unit 15 opens and closes the contacts of the relay, and semiconductors such as triacs based on the heating set temperature T1 set by the temperature setting switch (not shown) of the control panel 4 and the temperature detected by the temperature detecting means 11. The energization of the heater 10 is controlled by driving the element.

この第一の温度過昇防止器１３は、前記貯湯タンクの外表面が前記加熱設定温度Ｔ１よりも高い所定の温度Ｔ２を超えると作動して前記加熱ヒーターへの通電を遮断するバイメタルを利用した自動復帰式のサーモスタットである。また、第二の温度過昇防止器１４は、前記貯湯タンクの外表面が前記第一の温度過昇防止器１３の作動温度Ｔ２よりも高い所定の温度Ｔ３を超えると作動して前記加熱ヒーターへの通電を遮断するバイメタルを利用した手動復帰式のサーモスタットである。   This first overheat protection device 13 uses a bimetal that operates to shut off the current supply to the heating heater when the outer surface of the hot water storage tank exceeds a predetermined temperature T2 higher than the heating setting temperature T1. It is an automatic reset type thermostat. Further, the second overheat protection device 14 operates when the outer surface of the hot water storage tank exceeds a predetermined temperature T3 higher than the operation temperature T2 of the first overheat protection device 13 and the heating heater It is a manual reset type thermostat using a bimetal that shuts off the power supply.

また、温度ヒューズ１２の作動温度Ｔ４は、前記第二の温度過昇防止器１４の作動温度T3より高く設定されている。   The operating temperature T4 of the thermal fuse 12 is set higher than the operating temperature T3 of the second overheat protection device 14.

通常状態においては、温度ヒューズ１２は導通状態であり、第一の温度過昇防止器１３及び第二の温度過昇防止器１４の接点は閉じており、沸き上げスイッチ９を入りにすると、温度制御部１５により、加熱ヒーター１０への電源供給が制御され、前記貯湯タンク内の湯水が加熱設定温度T1へ沸き上げられる。   In the normal state, the temperature fuse 12 is in the on state, the contacts of the first overheat protection device 13 and the second overheat protection device 14 are closed, and the heating switch 9 is turned on. The control unit 15 controls the power supply to the heater 10, and the hot and cold water in the hot water storage tank is boiled to the heating set temperature T1.

そして、万一、通常の沸き上げ動作において、異常ではないのに何らかの理由で沸き上げ温度がＴ２以上に上昇すると、第一の温度過昇防止器１３が作動してその接点が開き、加熱ヒーター１０への通電を遮断する。その後、貯湯タンク内の湯水の温度が低下すると、自動的に接点が閉じて、加熱ヒーター１０への通電を再開する。   Then, in the normal boiling operation, if the boiling temperature rises to T2 or more for some reason although it is not abnormal, the first overheat protection device 13 operates to open its contact point, and the heating heater Cut off the power to 10. Thereafter, when the temperature of the hot and cold water in the hot water storage tank is lowered, the contact is automatically closed and the energization of the heater 10 is resumed.

また、貯湯タンク内に水が無い状態での加熱（空焚き）による異常な温度上昇が発生した場合は、第一の温度過昇防止器１３が作動して加熱ヒーターへの通電を遮断しても、余熱による温度上昇により第二の温度過昇防止器１４も作動するため、空焚きを繰り返すことがない。この場合は、第二の温度過昇防止器１４に設けられたリセットスイッチを押してリセット操作を行う必要があり、メンテナンス業者へ依頼することになる。   In addition, when an abnormal temperature rise occurs due to heating (airing) in a state where there is no water in the hot water storage tank, the first overheat protection device 13 operates to cut off the energization to the heater. Also, since the second overheat protection device 14 is also activated by the temperature rise due to the residual heat, the air-heating is not repeated. In this case, it is necessary to press the reset switch provided in the second overheat protection device 14 to perform the reset operation, and a maintenance contractor is requested.

なお、前記温度検出手段１１や温度制御部１５が故障した際には、第一の温度過昇防止器１３が作動し、加熱ヒーター１０への通電を遮断するが、貯湯タンク内の湯水の温度が低下すると、加熱ヒーター１０への通電を再開することになる。従って、この場合は、第二の温度過昇防止器１４は作動することがなく、第一の温度過昇防止器１３にて沸き上げ温度がＴ２で制御されることになるため、別途、前記温度検出手段１１や温度制御部１５の故障検出手段を備えることが望ましい。   When the temperature detection means 11 or the temperature control unit 15 breaks down, the first overheat prevention device 13 operates to cut off the energization to the heater 10, but the temperature of the hot water in the hot water storage tank Decreases, the energization of the heater 10 will be resumed. Therefore, in this case, the second temperature overheat prevention device 14 does not operate, and the boiling temperature is controlled to T2 by the first temperature overheat prevention device 13. It is desirable to include failure detection means for the temperature detection means 11 and the temperature control unit 15.

さらに、温度制御部１５、第一の温度過昇防止器１３、第二の温度過昇防止器１４のすべてが故障した際には、温度ヒューズ１２が溶断して、加熱ヒーター１０への通電を遮断する。   Furthermore, when all of the temperature control unit 15, the first overheat protection device 13, and the second overheat protection device 14 fail, the temperature fuse 12 is melted and the heating heater 10 is energized. Cut off.

図４は本発明の実施形態の温度過昇防止器の作動温度領域を示す図である。   FIG. 4 is a diagram showing an operating temperature range of the overheat protection device according to the embodiment of the present invention.

Ａは、温度制御部１５による沸き上げ温度領域（沸き上げ最大温度のばらつき）であり、Ｂは、第一の温度過昇防止器１３の作動温度領域（バイメタルの接点が開く温度のばらつき）であり、Ｃは、第二の温度過昇防止器１４の作動温度領域（バイメタルの接点が開く温度のばらつき）である。   A is a boiling temperature range (variation in boiling maximum temperature) by the temperature control unit 15, and B is an operating temperature range of the first overheat prevention device 13 (variation in temperature at which a bimetal contact opens) And C is the operating temperature range of the second overheat protection device 14 (the variation of the temperature at which the bimetal contact opens).

例えば、温度制御部１５による沸き上げ温度（加熱設定温度）Ｔ１は９０℃、第一の温度過昇防止器１３の作動温度Ｔ２は９５℃、第二の温度過昇防止器１４の作動温度Ｔ３は１００℃に設定されているが、湯水の使用状況や部品の精度等により、その作動領域（接点が開く温度等）には幅（ばらつき）がある。   For example, the boiling temperature (heating set temperature) T1 by the temperature control unit 15 is 90 ° C., the operating temperature T2 of the first overheat protection device 13 is 95 ° C., and the operating temperature T3 of the second overheat protection device 14 Is set at 100.degree. C., but there is a width (variation) in the operation area (temperature at which the contact opens) depending on the usage condition of the hot water and the accuracy of parts.

また、温度検出手段１１、第一の温度過昇防止器１３、第二の温度過昇防止器１４は貯湯タンク８の表面温度を検出しているため、貯湯タンク８内の湯水の実際の温度は、前記検出温度より多少高くなっている。   Further, since the temperature detection means 11, the first overheat protection device 13, and the second overheat protection device 14 detect the surface temperature of the hot water storage tank 8, the actual temperature of the hot water in the hot water storage tank 8 Is slightly higher than the detected temperature.

そのため、第一の温度過昇防止器１３の作動温度Ｔ２は、バイメタルの接点が開く温度のばらつきや貯湯タンクの表面温度と貯湯タンク内の実際の湯水の温度との差、さらには加熱ヒーターへの通電遮断後の余熱による温度上昇を考慮し、貯湯タンク内の湯水の温度が百度以上にならないように決定している。   Therefore, the operating temperature T2 of the first overheat protection device 13 is the difference between the temperature at which the bimetal contact opens and the difference between the surface temperature of the hot water storage tank and the actual hot water temperature in the hot water storage tank, and further to the heater. The temperature of the hot and cold water in the hot water storage tank is determined so as not to exceed 100 ° C. in consideration of the temperature rise due to the residual heat after the current supply is cut off.

１…貯湯式電気温水器
２…水栓
３…排水パイプ
４…操作盤
５…電源コード
６…電源コンセント
７…シンク
８…貯湯タンク
９…沸き上げスイッチ
１０…加熱ヒーター
１１…温度検出手段（サーミスター）
１２…温度ヒューズ
１３…第一の温度過昇防止器（自動復帰式バイメタル）
１４…第二の温度過昇防止器（手動復帰式バイメタル）
１５…温度制御部
１６…電源
Ａ…温度制御部による沸き上げ温度領域
Ｂ…第一の温度過昇防止器の作動温度領域
Ｃ…第二の温度過昇防止器の作動温度領域 DESCRIPTION OF SYMBOLS 1 ... Storage water type electric water heater 2 ... Water faucet 3 ... Drain pipe 4 ... Control panel 5 ... Power supply cord 6 ... Power outlet 7 ... Sink 8 ... Storage water tank 9 ... Boiling switch 10 ... Heating heater 11 ... Temperature detection means (Sir Mr.)
12: Thermal fuse 13: First overheat protector (automatic return type bimetal)
14 2nd overheat protection device (manual reset type bimetal)
15: Temperature control unit 16: Power supply A: Boiling temperature range by temperature control unit B: Operating temperature range of the first overheat prevention device C: Operating temperature range of the second overheat prevention device

Claims (2)

湯水を貯湯する貯湯タンクと、
前記貯湯タンクの下方に備えられ前記貯湯タンク内の湯水を加熱する加熱ヒーターと、
前記貯湯タンク内の湯水を設定された沸き上げ温度に加熱するために前記加熱ヒーターへの通電を制御する温度制御手段と、
前記貯湯タンク内の湯水の温度が前記沸き上げ温度より高い第一の温度になった時に前
記加熱ヒーターをオフする自動復帰式バイメタルである第一の温度過昇防止器と、
前記貯湯タンク内の湯水の温度が前記第一の温度より高い第二の温度になった時に前記
加熱ヒーターをオフする手動復帰式バイメタルである第二の温度過昇防止器と、を備え、
前記第一の温度過昇防止器と前記第二の温度過昇防止器は前記貯湯タンクの外表面の上方に近接して配置され、
前記第一の温度過昇防止器は前記第二の温度過昇防止器の上側に配置されている
ことを特徴とする貯湯式電気温水器。 With a hot water storage tank for storing hot and cold water,
A heater provided below the hot water storage tank for heating hot and cold water in the hot water storage tank ;
Temperature control means for controlling energization of the heater to heat the hot and cold water in the hot water storage tank to a set boiling temperature;
A first overheat protection device that is an automatic return bimetal that turns off the heater when the temperature of the hot water in the hot water storage tank reaches a first temperature higher than the boiling temperature;
And a second overheat protection device which is a manual reset type bimetal that turns off the heating heater when the temperature of the hot water in the hot water storage tank reaches a second temperature higher than the first temperature;
The first overheat protector and the second overheat protector are disposed in close proximity above the outer surface of the hot water storage tank,
The hot water storage type electric water heater, wherein the first overheat protection device is disposed on the upper side of the second overheat protection apparatus. 前記第一の温度は、百度以下であることを特徴とする請求項１に記載の貯湯式電気温水器。 The hot water storage type electric water heater according to claim 1, wherein the first temperature is equal to or less than one hundred degrees centigrade.
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