JP2009228982A - Hot water storage tank for hot water supply device and heat pump water heater using the same - Google Patents

Hot water storage tank for hot water supply device and heat pump water heater using the same Download PDF

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JP2009228982A
JP2009228982A JP2008074905A JP2008074905A JP2009228982A JP 2009228982 A JP2009228982 A JP 2009228982A JP 2008074905 A JP2008074905 A JP 2008074905A JP 2008074905 A JP2008074905 A JP 2008074905A JP 2009228982 A JP2009228982 A JP 2009228982A
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hot water
plate
storage tank
water supply
pressure
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JP4985504B2 (en
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Kazuto Nakatani
和人 中谷
Shinji Watanabe
伸二 渡辺
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Panasonic Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage tank of high usability, enduring positive pressure, negative pressure and repeated pressure, and costwise advantageous without substantially changing a body constitution. <P>SOLUTION: In this hot water storage tank where an upper part and a lower part of a roughly cylindrical shell plate 15 and roughly semispherical upper plate and lower plate 16 are respectively integrally formed by welding, a roughly circumferential projecting section 16a projecting outward, is disposed near an almost end section of the upper plate and/or a welding section of the lower plate 15, a roughly circumferential projecting section 15a projecting outward is disposed near the welding section of the upper part and/or the lower part of the roughly cylindrical shell plate 15, and a plate thickness at least near the welding section of the shell plate 15 is equal to or thinner than a plate thickness near the welding section of the upper plate and/or the lower plate 16, thus the strength of the hot water storage tank 4 when positive pressure and 0-pressure are repeatedly added thereto, is substantially improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、給湯機として用いられ、任意の温度に加熱した温水を貯めておく貯湯タンクに関するものである。   The present invention relates to a hot water storage tank that is used as a water heater and stores hot water heated to an arbitrary temperature.

従来、給湯機としては、ガスや石油を燃料として用い、その燃焼熱で水道水を加熱する給湯機が使用されてきた。これらは、速湯性に優れているという利点がある半面、ガス、石油といった燃料が必要でその供給が不可欠であること、燃焼後の排気ガスが大気に放出され大気汚染を招くこと、燃焼させるので不安全性を常に内在していること、燃焼時の音が大きいことなどの課題があった。特に近年増えている、エネルギー源を全て電気で行うというオール電化の住宅やマンションでは、燃料を供給する方法がないため、使用できないケースも増えてきている。   Conventionally, hot water heaters that use gas or petroleum as fuel and heat tap water with the combustion heat have been used as hot water heaters. While these have the advantage of being excellent in quick hot water properties, fuels such as gas and oil are necessary and their supply is indispensable, exhaust gas after combustion is released into the atmosphere, causing air pollution, and burning As such, there were problems such as being always unsafe and having a loud noise during combustion. In particular, in all-electric houses and condominiums where all energy sources are electricity, which has been increasing in recent years, there is no way to supply fuel, so there are increasing cases where it cannot be used.

そこで、加熱された温水を貯めておく大容量の貯湯タンクを備えた給湯装置が開発されている。この加熱方法としては、夜間割引の安価な電力を利用し、夜間に貯湯タンクの内部に配設された電気ヒータで加熱してできた一般的には80℃以上の温水を、貯湯タンクに貯めておき、この温水と水道水をミキシングして、使用者の欲する任意の温度にして、給湯端末から供給するものである。   In view of this, a hot water supply apparatus having a large-capacity hot water storage tank for storing heated hot water has been developed. As a heating method, hot water of 80 ° C or higher, which is generally heated by an electric heater installed in the hot water storage tank at night, is stored in the hot water storage tank. The hot water and tap water are mixed to obtain an arbitrary temperature desired by the user and supplied from the hot water supply terminal.

また、加熱方法として、ヒータ以外にヒートポンプを用いた貯湯式のヒートポンプ式給湯装置が開発されている。これは、大容量の貯湯タンクと、ヒートポンプ回路を組み入れた室外機を備え、夜間割引の安価な電力を利用して、ヒートポンプ回路で水道水を温水に加熱して、その温水を貯湯タンクに貯めておき、この温水と水道水をミキシングして、使用者の欲する任意の温度にして、給湯端末から供給するものである。このヒートポンプ式給湯装置は、冷媒の状態変化を利用して加熱しているので、電気ヒータによる加熱よりエネルギー効率が良く、入力に対する能力は3倍以上確保することが可能であり、ランニングコストも安価となるなどの特徴を持ち、燃焼による給湯機の問題を解決し、オール電化の住宅、マンションでも新たなインフラ整備を必要としないで手軽に設置することができ、普及してきている。   As a heating method, a hot water storage type heat pump type hot water supply apparatus using a heat pump in addition to the heater has been developed. This is equipped with a large-capacity hot water storage tank and an outdoor unit that incorporates a heat pump circuit. Using cheap electricity at night discounts, tap water is heated to hot water using the heat pump circuit, and the hot water is stored in the hot water storage tank. The hot water and tap water are mixed to obtain an arbitrary temperature desired by the user and supplied from the hot water supply terminal. Since this heat pump type hot water supply apparatus is heated by utilizing the change in the state of the refrigerant, it is more energy efficient than heating by an electric heater, and the capacity for input can be secured three times or more, and the running cost is also low. It has become popular because it solves the problem of hot water heaters due to combustion, and can be installed easily in all-electric houses and condominiums without the need for new infrastructure.

このように用いられている給湯装置の貯湯タンクの場合は、水道による水道圧が直接貯湯タンクに加わり、変形したり、亀裂が生じて水漏れしてしまうことを防ぐために、水道の給水部と、貯湯タンクの間に減圧弁を設け、貯湯タンクに加わる圧力を減じている。そして、この設定は、100kPaから200kPaに設定されているのが通常である。ところが、このような減圧弁を設けているために、給湯端末での水圧が減じてしまい、シャワー圧が低くなり、シャワーの勢いがなくなってしまう、3階建て住宅で3階給湯するなど高所での給湯する際に、流量が少なく時間がかかる、などの課題が出てきている。   In the case of a hot water storage tank of a hot water supply apparatus used in this way, in order to prevent water pressure from the water supply from being directly applied to the hot water storage tank and deforming or causing cracks to leak and water leakage, A pressure reducing valve is provided between the hot water storage tanks to reduce the pressure applied to the hot water storage tank. This setting is usually set from 100 kPa to 200 kPa. However, because such a pressure reducing valve is provided, the water pressure at the hot water supply terminal is reduced, the shower pressure is lowered, and the momentum of the shower is lost. When hot water is supplied, there are problems such as low flow rate and time.

それを防ぐには、貯湯タンクの強度を増すことが必要であり、貯湯タンクの正圧の耐圧性を上げるためには、概して板厚を上げて対応している場合が多い。しかし、貯湯タンクの材質は腐食をさせるためにステンレス製である場合がほとんどであり、板厚を上げることは、材料費のコストアップにつながってしまうこととなる。   In order to prevent this, it is necessary to increase the strength of the hot water storage tank, and in order to increase the pressure resistance of the positive pressure of the hot water storage tank, the plate thickness is generally increased in many cases. However, in most cases, the material of the hot water storage tank is made of stainless steel in order to corrode, and increasing the plate thickness leads to an increase in material costs.

また、その逆に貯湯タンクより給湯端末がある場合で、減圧弁を含む給水端末がなんらかの原因で詰まってしまった、閉塞した場合には、貯湯タンクには水頭圧の負圧が発生する。それによる変形を防ぐためには、上記したような、板厚を上げる他に、以下に示すような対応が取られている。   On the other hand, when there is a hot water supply terminal from the hot water storage tank and the water supply terminal including the pressure reducing valve is clogged for some reason or is clogged, negative pressure of water head pressure is generated in the hot water storage tank. In order to prevent deformation due to this, in addition to increasing the plate thickness as described above, the following measures are taken.

図8に示したように貯湯タンク51内部に環状の補強用のリブ52を溶接することにより、強度を向上させているものである(例えば、特許文献1参照)。また、図9で示した形状で貯湯タンク53の胴板54に複数個の補強リブ55を設け、この補強リブ55を胴板54中央部で狭く、胴板54の両端部で広くしたものであり、同じく負圧に対する強度を向上させている。また、これらは負圧に対する強度を上げているが、当然正圧に対する強度も若干向上しているものと思われる(例えば、特許文献2参照)。
実開昭62−76863号公報 特開平3−148489号公報
As shown in FIG. 8, the strength is improved by welding an annular reinforcing rib 52 inside the hot water storage tank 51 (see, for example, Patent Document 1). Further, a plurality of reinforcing ribs 55 are provided on the body plate 54 of the hot water storage tank 53 in the shape shown in FIG. 9, and the reinforcing ribs 55 are narrow at the center of the body plate 54 and wide at both ends of the body plate 54. Yes, it also improves the strength against negative pressure. Moreover, although these have raised the intensity | strength with respect to a negative pressure, naturally the intensity | strength with respect to a positive pressure is also considered to have improved a little (for example, refer patent document 2).
Japanese Utility Model Publication No. 62-76863 JP-A-3-148484

しかしながら、上記特許文献1の構成では、補強リブ52が胴板にスポット溶接されているために、スポット溶接箇所の胴板の強度が落ちており、0(ゼロ)圧と圧力逃し弁の設定圧が繰返し貯湯タンクにかかった時に、スポット溶接部分から亀裂が生じてしまうことがあり、耐久面での課題があった。また、補強リブ52が胴板51aの内部に溶接されているために、貯湯タンク51内に温水を貯めていた際に、補強リブ52と胴板51aの間で隙間腐食が生じ、貯湯タンク51に孔が空いてしまうようなこともあり、同じく耐久面で課題を有していた。   However, since the reinforcing rib 52 is spot-welded to the body plate in the configuration of the above-mentioned Patent Document 1, the strength of the body plate at the spot welded spot is reduced, and the zero pressure and the set pressure of the pressure relief valve are reduced. When repeatedly applied to the hot water storage tank, cracks may occur from the spot welded portion, which has a problem in terms of durability. Further, since the reinforcing ribs 52 are welded to the inside of the body plate 51a, when hot water is stored in the hot water storage tank 51, crevice corrosion occurs between the reinforcing ribs 52 and the body plate 51a, and the hot water storage tank 51. In some cases, there was a problem in terms of durability.

また、特許文献2においては、上記課題を解決するために考案されているが、胴板54に補強リブ55を外方に張り出すためには、胴板54をロール加工で張り出すか、タンク加工を施した後ハイドロフォーミング加工を行なうことが必要である。前記ロール加工の際に張り出すと、どうしても真円が保つことが難しくなり、歪んだ状態となってしまう。そのため、胴板54の上下にある上部板56、下部板57と勘合させて、貯湯タンク53のタンク完成とすることが非常に困難となっている。   Further, in Patent Document 2, it has been devised to solve the above-mentioned problem. However, in order to project the reinforcing rib 55 outward on the body plate 54, the body plate 54 is projected by roll processing or a tank. It is necessary to perform hydroforming after the processing. If it overhangs at the time of the roll processing, it becomes difficult to keep a perfect circle, and it becomes a distorted state. Therefore, it is very difficult to complete the tank of the hot water storage tank 53 by fitting with the upper plate 56 and the lower plate 57 above and below the trunk plate 54.

また、ハイドロフォーミング加工は、タンク完成後に水圧をかけて、胴板54を変形させるものであるが、300Lを超えるようなタンクにて加工を行なおうとする場合は、その装置が非常に大きく、圧力も過大なものが必要であり、コスト面でも大きく上がってしまうこととなる。また、正圧のかかる条件では、このリブを外方に張り出す構成では不十分であり、補強リブ55を設けても、効果はほとんどなく、むしろ応力面では悪化してしまう。これをクリアするには、結局胴板54の板厚を上げることが必要であり、板厚を上げれば、材料がステンレスの場合コストアップとなるし、補強リブ55のリブ出し加工を行なうための、ロール加工や、ハイドロフォーミング加工がやりにくくなり、結局は更なるコストアップを招くという課題を有していることとなる。   In addition, the hydroforming process is to deform the body plate 54 by applying water pressure after completion of the tank. However, when processing is to be performed in a tank exceeding 300 L, the apparatus is very large, An excessive pressure is required, and the cost is greatly increased. Further, under the condition where a positive pressure is applied, the structure of projecting the ribs outward is not sufficient, and even if the reinforcing ribs 55 are provided, there is almost no effect, but rather the stress is deteriorated. In order to clear this, it is necessary to increase the plate thickness of the body plate 54. If the plate thickness is increased, the cost increases when the material is stainless steel, and the ribs for the reinforcing rib 55 are processed. However, it becomes difficult to perform roll processing and hydroforming processing, and eventually, there is a problem that further cost increase is caused.

本発明は上記従来の課題を解決するもので、正圧、負圧、繰り返しの圧力に耐えることができ、コスト的にも有利で、本体構成も大幅に変えずとも可能な、使用性の高い貯湯タンクを提供することを目的とする。   The present invention solves the above-described conventional problems, can withstand positive pressure, negative pressure, and repeated pressure, is advantageous in terms of cost, and can be used without greatly changing the main body configuration, and has high usability. The purpose is to provide a hot water storage tank.

前記従来の課題を解決するために、本発明の給湯装置の貯湯タンクは、略円筒状の胴板の上方及び下方と、略半球状の上部板及び下部板とをそれぞれ溶接で一体形成し、加熱手段を用いて任意の温度に加熱した温水を貯湯する給湯装置の貯湯タンクにおいて、前記上部板の略端部及び/又は下部板の溶接部近傍に外方へ突出させた略円周状の凸部を設け、前記略円筒状の胴板の上方及び/又は下方の溶接部近傍に外方へ突出させた略円周状の凸部を設けるとともに、前記胴板の少なくとも溶接部近傍の板厚を、前記上部板及び/又は下部板の溶接部近傍の板厚と同等もしくはそれより薄くしたことを特徴するもので、貯湯タンクに正圧と0圧が繰返し加わった時の、強度を大幅に向上させることができるもので
ある。
In order to solve the above-described conventional problems, the hot water storage tank of the hot water supply apparatus of the present invention integrally forms the upper and lower portions of the substantially cylindrical body plate and the substantially hemispherical upper and lower plates by welding, respectively. In a hot water storage tank of a hot water supply device that stores hot water heated to an arbitrary temperature using a heating means, a substantially circumferential shape that protrudes outward in the vicinity of the welded portion of the upper plate and / or the lower plate. Providing a convex portion, providing a substantially circumferential convex portion projecting outward near the welded portion above and / or below the substantially cylindrical body plate, and at least a plate near the welded portion of the body plate Thickness is equal to or less than the thickness of the upper plate and / or lower plate near the welded portion, greatly increasing the strength when positive pressure and zero pressure are repeatedly applied to the hot water storage tank. Can be improved.

本発明によれば、耐圧強度を向上することができ、使用性にも耐久性にも優れ、コスト合理化も可能な貯湯タンクを提供できる。   According to the present invention, it is possible to provide a hot water storage tank that can improve pressure resistance, is excellent in usability and durability, and can be rationalized in cost.

第1の発明の給湯装置の貯湯タンクは、略円筒状の胴板の上方及び下方と、略半球状の上部板及び下部板とをそれぞれ溶接で一体形成し、加熱手段を用いて任意の温度に加熱した温水を貯湯する給湯装置の貯湯タンクにおいて、前記上部板の略端部及び/又は下部板の溶接部近傍に外方へ突出させた略円周状の凸部を設け、前記略円筒状の胴板の上方及び/又は下方の溶接部近傍に外方へ突出させた略円周状の凸部を設けるとともに、前記胴板の少なくとも溶接部近傍の板厚を、前記上部板及び/又は下部板の溶接部近傍の板厚と同等もしくはそれより薄くしたことを特徴するもので、給湯端末(蛇口など)で、給湯、OFFを繰返されると、貯湯タンクには、0(ゼロ)圧と減圧弁の設定圧が繰返しかかることとなり、その際に胴板が、上部板、あるいは下部板との接合部を支点として、膨縮を繰返すこととなる。それに対して、その部位の強度を増しているので、亀裂が生じてしまうということがなく、耐久性を大幅に向上させることができる。   A hot water storage tank of a hot water supply apparatus according to a first aspect of the present invention is formed by integrally forming an upper portion and a lower portion of a substantially cylindrical body plate and a substantially hemispherical upper plate and a lower plate, respectively, and using a heating means at any temperature In the hot water storage tank of a hot water supply apparatus for storing hot water heated to a substantially circular shape, a substantially circumferential convex portion projecting outward is provided in the vicinity of the welded portion of the upper plate and / or the lower plate. A substantially circumferential convex portion projecting outward is provided in the vicinity of the welded portion above and / or below the cylindrical shell plate, and the plate thickness at least in the vicinity of the welded portion of the shell plate is set to the upper plate and / or Or, it is characterized by being equal to or thinner than the plate thickness near the welded part of the lower plate. When hot water supply and OFF are repeated at a hot water supply terminal (faucet, etc.), the hot water storage tank has 0 (zero) pressure. And the set pressure of the pressure reducing valve are repeatedly applied. Plate or as a fulcrum junction with the lower plate, so that the repeated expansion and contraction. On the other hand, since the strength of the part is increased, there is no occurrence of cracks, and the durability can be greatly improved.

そのため、減圧弁の設定圧力を高く設定することができ、給湯端末であるシャワー圧を上げることが可能となり、シャワーの勢いが増すことにより、使用性が大幅に向上したり、給湯圧が上がることにより、3階への風呂給湯が可能となったり、3階への蛇口給湯が可能となったり、使い勝手が大幅に良くなることとなる。   Therefore, the pressure setting of the pressure reducing valve can be set high, the shower pressure that is the hot water supply terminal can be increased, and the shower momentum increases, so that the usability is greatly improved and the hot water supply pressure is increased. Accordingly, bath hot water supply to the third floor becomes possible, faucet hot water supply to the third floor becomes possible, and usability is greatly improved.

第2の発明の給湯装置の貯湯タンクは、略円筒状の胴板の上方及び下方と、略半球状の上部板及び下部板とをそれぞれ溶接で一体形成し、加熱手段を用いて任意の温度に加熱した温水を貯湯する給湯装置の貯湯タンクにおいて、前記上部板の略端部及び/又は下部板の溶接部近傍に外方へ突出させた略円周状の凸部を設け、前記略円筒状の胴板の上方及び/又は下方の溶接部近傍に前記胴板と同心円状の胴外板を設けるとともに、前記胴板の少なくとも溶接部近傍の板厚を、前記上部板及び/又は下部板の溶接部近傍の板厚と同等もしくはそれより薄くしたことを特徴するもので、給湯端末(蛇口など)で、給湯、OFFを繰返されると、貯湯タンクには、0(ゼロ)圧と減圧弁の設定圧が繰返しかかることとなり、その際に胴板が、上部板、あるいは下部板との接合部を支点として、膨縮を繰返すこととなる。それに対して、その部位の強度を増しているので、亀裂が生じてしまうということがなく、耐久性を大幅に向上させることができる。   The hot water storage tank of the hot water supply apparatus of the second invention is formed by integrally forming the upper and lower portions of the substantially cylindrical body plate and the substantially hemispherical upper and lower plates by welding, and using a heating means at any temperature. In the hot water storage tank of a hot water supply apparatus for storing hot water heated to a substantially circular shape, a substantially circumferential convex portion projecting outward is provided in the vicinity of the welded portion of the upper plate and / or the lower plate. A trunk outer plate concentric with the trunk plate is provided in the vicinity of the welded portion above and / or below the cylindrical shell plate, and the thickness of at least the welded portion of the trunk plate is set to the upper plate and / or the lower plate. It is characterized by being equal to or thinner than the plate thickness in the vicinity of the welded portion of the hot water tank. When hot water is turned on and off repeatedly at a hot water supply terminal (faucet, etc.), the hot water storage tank has 0 (zero) pressure and a pressure reducing valve. The set pressure is repeatedly applied, and the body plate is Or as a fulcrum junction with the lower plate, so that the repeated expansion and contraction. On the other hand, since the strength of the part is increased, there is no occurrence of cracks, and the durability can be greatly improved.

そのため、減圧弁の設定圧力を高く設定することができ、給湯端末であるシャワー圧を上げることが可能となり、シャワーの勢いが増すことにより、使用性が大幅に向上したり、給湯圧が上がることにより、3階への風呂給湯が可能となったり、3階への蛇口給湯が可能となったり、使い勝手が大幅に良くなることとなる。   Therefore, the pressure setting of the pressure reducing valve can be set high, the shower pressure that is the hot water supply terminal can be increased, and the shower momentum increases, so that the usability is greatly improved and the hot water supply pressure is increased. Accordingly, bath hot water supply to the third floor becomes possible, faucet hot water supply to the third floor becomes possible, and usability is greatly improved.

第3の発明は、第1あるいは第2の発明のいずれかの給湯装置の貯湯タンクにおいて、水道水を給水するための給水部と、温水を供給するための出湯部と、前記給水部に設けた給水圧力を減ずるための減圧弁と、前記減圧弁以上の圧力を開放するための圧力逃し安全弁とを備え、前記減圧弁の設定圧力を0.25MPa以上としたことを特徴するもので、第1あるいは第2の発明で貯湯タンクの強度を増していることにより、減圧弁の設定圧力を高くすることが可能となり、それにより、シャワー圧を上げて、シャワーの勢いを強くする、あるいは3階建て住宅で3階給湯するなど高所での給湯するために、給湯圧を上げて使用する、湯はり時間の短縮化が図れることが可能となり、使用性が大幅に向上することとなる。   3rd invention is provided in the hot water storage tank of the hot water supply apparatus in any one of the 1st or 2nd invention in the water supply part for supplying tap water, the hot water supply part for supplying warm water, and the said water supply part A pressure reducing valve for reducing the feed water pressure, and a pressure relief safety valve for releasing the pressure higher than the pressure reducing valve, wherein the set pressure of the pressure reducing valve is set to 0.25 MPa or more. By increasing the strength of the hot water storage tank in the first or second invention, it becomes possible to increase the set pressure of the pressure reducing valve, thereby increasing the shower pressure and increasing the momentum of the shower, or the third floor In order to supply hot water in high places such as hot water supply on the 3rd floor in a built house, it is possible to shorten the hot water time used by increasing the hot water supply pressure, and the usability is greatly improved.

第4の発明は、第1〜第3のいずれかの発明の給湯装置の貯湯タンクと、圧縮機、水−冷媒熱交換器、減圧手段、空気−冷媒熱交換器を順次接続して形成した加熱手段とから構成したことを特徴とするヒートポンプ給湯機で、低コスト化を図りつつ、断熱性能を確保できることにより、より普及度を高めることが可能な給湯装置とすることができる。   The fourth invention is formed by sequentially connecting a hot water storage tank of the hot water supply apparatus of any one of the first to third inventions, a compressor, a water-refrigerant heat exchanger, a pressure reducing means, and an air-refrigerant heat exchanger. With a heat pump water heater characterized by comprising a heating means, it is possible to provide a hot water supply apparatus that can further increase the degree of spread by ensuring heat insulation performance while reducing costs.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(実施の形態1)
以下に、本発明の第1の実施の形態について、図面を参照しながら説明する。図1は、本発明の給湯装置の正面内観図であり、図2は給湯装置の回路図である。
(Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the hot water supply apparatus of the present invention, and FIG. 2 is a circuit diagram of the hot water supply apparatus.

1は給湯装置の貯湯タンクユニットであり、2はヒートポンプ回路を有するヒートポンプユニットである。そして、この貯湯タンクユニット1とヒートポンプユニット2は、2本の水配管3(3a、3b)で連結している。   Reference numeral 1 denotes a hot water storage tank unit of the hot water supply apparatus, and 2 denotes a heat pump unit having a heat pump circuit. The hot water storage tank unit 1 and the heat pump unit 2 are connected by two water pipes 3 (3a, 3b).

給湯装置の貯湯タンクユニット1内部には、ヒートポンプユニット2で加熱された温水を貯めておく貯湯タンク4があり、水道水をヒートポンプユニット2で加熱して温水として貯めておき、必要な際に、水道水とミキシングして、所定の温度にして給湯することとができる。この貯湯タンク4は、薄板の耐腐食性に優れたステンレス製のプレス部品で構成されており、略円筒状になっている。   Inside the hot water storage tank unit 1 of the water heater, there is a hot water storage tank 4 for storing hot water heated by the heat pump unit 2, and the tap water is heated by the heat pump unit 2 and stored as hot water. It can be mixed with tap water to supply hot water at a predetermined temperature. The hot water storage tank 4 is formed of a stainless steel press part having excellent corrosion resistance of a thin plate, and has a substantially cylindrical shape.

この貯湯タンク4の前方には、水道水を供給する給水管5があり、この給水管5から供給された水圧を一定の水圧に減ずるための減圧弁6が配されており、それ以外に水ポンプ7などの機能部品や、制御基板8などの制御部品が配されている。   In front of the hot water storage tank 4, there is a water supply pipe 5 for supplying tap water, and a pressure reducing valve 6 for reducing the water pressure supplied from the water supply pipe 5 to a constant water pressure is arranged. Functional parts such as the pump 7 and control parts such as the control board 8 are arranged.

減圧弁6は水道水の圧力を概して、従来は120kPa以下に減じて貯湯タンク4に供給するものであり、貯湯タンク4にかかる圧力を減ずることで、貯湯タンク4の変形防止、耐久性向上を確保している。また、近年では高圧タイプとして、減圧弁の設定を180kPaまで上げているものも登場しているが、今回のこの仕様では、減圧弁の設定を250kPa以上として、280kPaまで上げて、さらに高圧タイプの貯湯タンクユニット1としている。また、この減圧弁6にはストレーナを組み込み、水道水内のゴミ、コンタミネーションを除去するようになっている。   The pressure reducing valve 6 generally reduces the pressure of tap water to 120 kPa or less and supplies it to the hot water tank 4. By reducing the pressure applied to the hot water tank 4, the hot water tank 4 is prevented from being deformed and improved in durability. Secured. In recent years, as a high pressure type, a pressure reducing valve has been set up to 180 kPa. However, in this specification, the pressure reducing valve is set to 250 kPa or higher and increased to 280 kPa. The hot water storage tank unit 1 is used. In addition, a strainer is incorporated in the pressure reducing valve 6 to remove dust and contamination in the tap water.

9は密閉された圧力容器である貯湯タンク4の上死点に設けられた、圧力逃し安全弁であり、貯湯タンク4の破裂を防ぐ缶体内の異常圧力を抜くための装置として、減圧弁6の設定圧力よりも高く設定してある。この仕様では280kPaより高い設定として、減圧弁6のバラツキも考慮して、340kPa程度に設定している。   A pressure relief safety valve 9 is provided at the top dead center of the hot water storage tank 4 which is a sealed pressure vessel. As a device for removing abnormal pressure in the can body to prevent the hot water storage tank 4 from bursting, It is set higher than the set pressure. In this specification, a setting higher than 280 kPa is set to about 340 kPa in consideration of variations of the pressure reducing valve 6.

ヒートポンプユニット2には、圧縮機、放熱器、減圧手段、空気−冷媒熱交換器を順次接続した冷媒サイクルが組み込まれており、10は圧縮機、11は放熱器であり、水−冷媒熱交換器として、水道水を加熱する熱交換器であり、12は空気−冷媒熱交換器である。13は空気−冷媒熱交換器12の前方に配された送風手段である送風ファンであり、空気−冷媒熱交換器12から、風を吸引し、蒸発能力を高め、ヒートポンプ加熱能力を高めるようになっている。そして、ヒートポンプユニット2で80℃以上に加熱された水道水は、温水となって、水配管3bで給湯装置の貯湯タンクユニット1に運ばれ、貯湯タンク4に貯湯されるわけである。   The heat pump unit 2 incorporates a refrigerant cycle in which a compressor, a radiator, a decompression unit, and an air-refrigerant heat exchanger are sequentially connected. 10 is a compressor, 11 is a radiator, and water-refrigerant heat exchange. As a vessel, a heat exchanger for heating tap water is provided, and 12 is an air-refrigerant heat exchanger. Reference numeral 13 denotes a blower fan which is a blower disposed in front of the air-refrigerant heat exchanger 12 so as to suck air from the air-refrigerant heat exchanger 12 to increase the evaporation capacity and to increase the heat pump heating capacity. It has become. Then, the tap water heated to 80 ° C. or higher by the heat pump unit 2 becomes hot water, is carried to the hot water storage tank unit 1 of the hot water supply device through the water pipe 3 b, and is stored in the hot water storage tank 4.

給湯装置の貯湯タンク4の詳細図は、図3(a)に上面図、図3(b)に側面図を記載
している。14は耐腐食性を有するステンレス鋼鈑を絞り加工して成形した上部板であり、15は上部板14とTig溶接で一体化された同じくステンレス鋼鈑の胴板であり、平板をロール加工にて、円筒状にし、Tig溶接を縦方向に行ってある。16は胴板15の下方に配され、胴板とTig溶接で一体化された下部板であり、上部板14と同様にステンレス鋼鈑を絞り加工して成形してある。この3部品で閉塞空間を形成し、その内方に温水を貯留することにより、給湯装置の貯湯タンクの役割を果たすようになっている。また、上部板14、下部板16には、給水口や温水取出し口が設けられている。
Detailed views of the hot water storage tank 4 of the hot water supply apparatus are a top view in FIG. 3 (a) and a side view in FIG. 3 (b). 14 is an upper plate formed by drawing a stainless steel plate having corrosion resistance, and 15 is a body plate of the same stainless steel plate integrated with the upper plate 14 by Tig welding. The cylinder is formed and Tig welding is performed in the vertical direction. Reference numeral 16 denotes a lower plate disposed below the body plate 15 and integrated with the body plate by Tig welding, and is formed by drawing a stainless steel plate in the same manner as the upper plate 14. A closed space is formed by these three parts, and hot water is stored inside the closed space, thereby serving as a hot water storage tank of the hot water supply apparatus. Further, the upper plate 14 and the lower plate 16 are provided with a water supply port and a hot water outlet.

この中で、胴板15、下部板16の断面図を記載したのが、図4、図5である。下部板16の最上部には、外方へ突出させた円周状の下部板リブ部16aが設けられており、胴板15の最下方にも同じく外方へ張出した円周状の胴板リブ部15aが設けられている。15bは胴板15と下部板16の接合部であり、Tig溶接で一体化されている。これは下部板16と胴板15の関係を記載したが、上部板14と胴板15に関しても、図3に記した胴板15と上部板14の接合部である15cにおいて、上部板リブ部14aと、胴板リブ部15aが設けられている。   Among these, FIGS. 4 and 5 show sectional views of the body plate 15 and the lower plate 16. A circumferential lower plate rib portion 16 a protruding outward is provided at the uppermost portion of the lower plate 16, and a circumferential body plate is also projected outwardly at the lowermost portion of the body plate 15. Ribs 15a are provided. 15b is a joint between the body plate 15 and the lower plate 16, and is integrated by Tig welding. This describes the relationship between the lower plate 16 and the body plate 15, but the upper plate 14 and the body plate 15 also have an upper plate rib portion at 15c, which is the joint between the body plate 15 and the upper plate 14 shown in FIG. 14a and the body plate rib part 15a are provided.

以下、図面に基づいて、上記給湯装置の動作を説明する。   Hereinafter, the operation of the hot water supply apparatus will be described with reference to the drawings.

給水管5から給水された水道水は、一旦貯湯タンク4の内部に入る。その貯湯タンク4からポンプ7を介し、水配管3(3a)を通りヒートポンプユニット2に送られる。ヒートポンプユニット2では、圧縮機10を駆動させると、高圧まで圧縮されて吐出された冷媒は、水−冷媒熱交換器である放熱器11に送られ、ここで水配管3(3a)から送られてきた水道水と熱交換して放熱する。これにより、水道水は高温に加熱され、他方の水配管3bで再度、給湯タンクユニット1に送られる。高温となり給湯タンクユニット1に戻った温水は、貯湯タンク4で貯湯される。そして、貯湯された温水は、給湯操作が行われると、貯湯タンク4の温水と、給水管5から、減圧弁9を介して給水された水道水が、混合弁20で混合され、所定の温度となって給湯管21を介して、蛇口や風呂などの給湯端末22給湯される。   The tap water supplied from the water supply pipe 5 once enters the hot water storage tank 4. The hot water storage tank 4 is sent to the heat pump unit 2 through the water pipe 3 (3a) via the pump 7. In the heat pump unit 2, when the compressor 10 is driven, the refrigerant compressed and discharged to a high pressure is sent to the radiator 11 which is a water-refrigerant heat exchanger, and is sent from the water pipe 3 (3a). Heat is exchanged with tap water. Thus, the tap water is heated to a high temperature and sent again to the hot water supply tank unit 1 through the other water pipe 3b. Hot water returned to the hot water tank unit 1 due to high temperature is stored in the hot water storage tank 4. When the hot water stored in the hot water is operated for hot water supply, the hot water in the hot water storage tank 4 and the tap water supplied from the water supply pipe 5 through the pressure reducing valve 9 are mixed by the mixing valve 20, and the predetermined temperature is reached. The hot water supply terminal 22 such as a faucet or a bath is supplied with hot water through the hot water supply pipe 21.

この際に、水道圧の圧力が貯湯タンク4に加わらないように、給水管5には圧力を減ずるための減圧弁9が設けられており、280kPa程度に減圧を行う。それにより、給湯端末22をON−OFFすると、20〜60kPa程度の圧力と、減圧弁9の設定圧力である280kPaが繰り返し、貯湯タンク4にかかることとなる。また、貯湯タンク4内の温度が上昇し、内部圧力が高くなった場合の圧力逃し弁9が開放されるまでの圧力340kPaが貯湯タンク4にかかることとなる。   At this time, a pressure reducing valve 9 for reducing the pressure is provided in the water supply pipe 5 so that the pressure of the water supply pressure is not applied to the hot water storage tank 4, and the pressure is reduced to about 280 kPa. Accordingly, when the hot water supply terminal 22 is turned on and off, a pressure of about 20 to 60 kPa and a set pressure of the pressure reducing valve 9 of 280 kPa are repeatedly applied to the hot water storage tank 4. Further, a pressure of 340 kPa is applied to the hot water storage tank 4 until the pressure relief valve 9 is opened when the temperature in the hot water storage tank 4 rises and the internal pressure increases.

そのため、貯湯タンク4の胴板15は、Tig溶接してある上部板14と胴板15の接合部15c、下部板16と胴板15の接合部15bを支点として、中央部が膨縮を繰返すこととなる。   Therefore, the body plate 15 of the hot water storage tank 4 repeats expansion and contraction at the center with the joint 15c between the upper plate 14 and the body plate 15 Tig welded and the joint 15b between the lower plate 16 and the body plate 15 as fulcrums. It will be.

貯湯タンク4に、340kPaの内圧をかけた際の最も高い所は、下部板16と胴板15の接合部分であるが、その際に、下部板16に下部板リブ部16a、胴板15の最下方にも同じく外方へ張出した円周状の胴板リブ部15aを設けているために、胴板の膨縮がその根元部位で抑えられることとなり、胴板15の変位を減ずることができる。そのため、接合部15bの応力を低減することが可能となり、繰返し荷重に対する耐力を大幅に向上させることが可能となり、減圧弁、圧力逃し弁の設定圧力を高くすることができ、湯端末であるシャワー圧を上げることが可能となり、シャワーの勢いが増すことにより、使用性が大幅に向上したり、給湯圧が上がることにより、3階への風呂給湯が可能となったり、3階への蛇口給湯が可能となったり、使い勝手が大幅に良くなることとなる。   The highest place when the internal pressure of 340 kPa is applied to the hot water storage tank 4 is a joint portion between the lower plate 16 and the trunk plate 15, and at that time, the lower plate 16 has the lower plate rib portion 16 a and the trunk plate 15. Since the circumferentially shaped trunk plate rib portion 15a is also provided in the lowermost portion, the expansion and contraction of the trunk plate is suppressed at the root portion, and the displacement of the trunk plate 15 may be reduced. it can. Therefore, it becomes possible to reduce the stress of the joint 15b, greatly improve the proof strength against repeated loads, increase the set pressure of the pressure reducing valve and the pressure relief valve, and a shower that is a hot water terminal. It is possible to increase the pressure and increase the momentum of the shower, so that the usability is greatly improved, the hot water supply pressure is increased, bath water supply to the third floor becomes possible, and the tap water supply to the third floor Will be possible, and usability will be greatly improved.

また、胴板15の接合部15bの応力を低減することができるために、胴板15の板厚を下部板16、上部板14よりも薄くすることも可能となるので、それによりコスト合理化が可能となり、低価格の給湯装置を提供することができる。   Further, since the stress of the joint portion 15b of the trunk plate 15 can be reduced, the plate thickness of the trunk plate 15 can be made thinner than the lower plate 16 and the upper plate 14, thereby reducing the cost. This makes it possible to provide a low-cost hot water supply apparatus.

また、貯湯タンク4の強度を向上させるために行った貯湯タンク4の形状は、従来のものと大きくは変わっていないために、本体筐体の寸法をコンパクトに保つ、あるいは胴板15の外方に熱伝導率の低い断熱材を用いることにより、断熱性能を高め、貯湯された温水の温度低下を防ぎ、省エネを図ることも可能となり、ひいては加工に際し従来のままでも加工することができるなど、品質安定化も可能となるなど、使用性にも耐久性にも優れた給湯装置の貯湯タンクを提供できる。   Further, since the shape of the hot water storage tank 4 made to improve the strength of the hot water storage tank 4 is not greatly changed from the conventional one, the size of the main body housing is kept compact or the outer side of the body plate 15 is removed. By using a heat insulating material with low thermal conductivity, it is possible to improve heat insulation performance, prevent temperature drop of hot water stored, and save energy, and as a result, it can be processed as before, etc. It is possible to provide a hot water storage tank for a hot water supply device that is excellent in usability and durability, such as being able to stabilize quality.

(実施の形態2)
以下に、本発明の第2の実施の形態について、図6、図7を参照しながら説明する。実施の形態1と同等の箇所に関しては同番号を付し、その説明は省略する。
(Embodiment 2)
The second embodiment of the present invention will be described below with reference to FIGS. The same number is attached | subjected about the location equivalent to Embodiment 1, and the description is abbreviate | omitted.

貯湯タンク4の中央部に胴板15があり、その下方には下部板16があり、これはTig溶接で一体化され、閉塞空間を形成している。この下部板16の下方には、胴板15と同心円の胴外板15dが、Tig溶接で胴板15に溶接されている。また、下部板16の最上部には、外方へ突出させた円周状の下部板リブ部16aが設けられている。   There is a body plate 15 at the center of the hot water storage tank 4 and a lower plate 16 below it, which is integrated by Tig welding to form a closed space. Below the lower plate 16, a trunk outer plate 15d concentric with the trunk plate 15 is welded to the trunk plate 15 by Tig welding. In addition, a circumferential lower plate rib portion 16 a that protrudes outward is provided at the uppermost portion of the lower plate 16.

その際に、下部板16に下部板リブ部16a、胴板15の最下方にも同じく強度を増した、胴外板15dを設けているために、胴板15の膨縮がその根元部位で抑えられることとなり、胴板15の変位を減ずることができ、繰返し荷重に対する耐力を大幅に向上させることが可能となり、減圧弁6、圧力逃し弁9の設定圧力を高くすることができ、湯端末であるシャワー圧を上げることが可能となり、シャワーの勢いが増すことにより、使用性が大幅に向上したり、給湯圧が上がることにより、3階への風呂給湯が可能となったり、3階への蛇口給湯が可能となり、使い勝手が大幅に良くなることとなる。   At that time, since the lower plate 16 is provided with the lower plate rib portion 16a and the outer plate 15d having the same strength at the lowermost portion of the trunk plate 15, the expansion and contraction of the trunk plate 15 is caused at the base portion thereof. As a result, the displacement of the body plate 15 can be reduced, the proof strength against repeated loads can be greatly improved, the set pressure of the pressure reducing valve 6 and the pressure relief valve 9 can be increased, and the hot water terminal It is possible to increase the shower pressure, and by increasing the momentum of the shower, usability is greatly improved, and the hot water supply pressure increases, so bath water supply to the 3rd floor becomes possible, and to the 3rd floor Faucet hot water supply becomes possible, and usability is greatly improved.

また、胴板15の接合部15bの応力を低減することができるために、胴板15の板厚を下部板16、上部板14よりも薄くすることも可能となるので、それによりコスト合理化が可能となり、低価格の給湯装置を提供することができる。   Further, since the stress of the joint portion 15b of the trunk plate 15 can be reduced, the plate thickness of the trunk plate 15 can be made thinner than the lower plate 16 and the upper plate 14, thereby reducing the cost. This makes it possible to provide a low-cost hot water supply apparatus.

以上のように、本発明は、温水をためてそれを供給する給湯装置に適用され、例えば家庭用のヒートポンプ給湯装置などに適している。   As described above, the present invention is applied to a hot water supply device that stores hot water and supplies it, and is suitable for, for example, a household heat pump hot water supply device.

本発明の実施の形態1における給湯装置の貯湯タンクの正面図The front view of the hot water storage tank of the hot water supply apparatus in Embodiment 1 of this invention 同給湯装置の回路図Circuit diagram of the water heater (a)同給湯装置の貯湯タンクの上面図(b)同給湯装置の貯湯タンクの側面図(A) Top view of the hot water storage tank of the hot water supply device (b) Side view of the hot water storage tank of the hot water supply device 同給湯装置の貯湯タンクの下部正面図Lower front view of the hot water storage tank of the water heater 図4のA部詳細図Part A detail view of FIG. 本発明の実施の形態2における給湯装置の貯湯タンクの下部正面図The lower front view of the hot water storage tank of the hot water supply apparatus in Embodiment 2 of this invention 図6のB部詳細図Part B detail view of FIG. 従来の給湯装置の断面図Sectional view of a conventional water heater 従来の他の給湯装置の断面図Cross-sectional view of another conventional water heater

符号の説明Explanation of symbols

1 給湯装置の貯湯タンクユニット
2 ヒートポンプユニット
3a、3b 水配管
4 貯湯タンク
5 給水管
6 減圧弁
7 水ポンプ
8 制御P板
9 圧力逃し安全弁
10 圧縮機
11 放熱器
12 空気−冷媒熱交換器
13 送風ファン
14 上部板
14a 上部板リブ部(凸部)
15 胴板
15a 胴板リブ部(凸部)
15b 胴板接合部(下部)
15c 胴板接合部(上部)
15d 胴外板
16 下部板
16a 下部板リブ部(凸部)
22 給湯端末
DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit of hot water supply apparatus 2 Heat pump unit 3a, 3b Water piping 4 Hot water storage tank 5 Water supply pipe 6 Pressure reducing valve 7 Water pump 8 Control P board 9 Pressure relief safety valve 10 Compressor 11 Radiator 12 Air-refrigerant heat exchanger 13 Blower Fan 14 Upper plate 14a Upper plate rib (convex)
15 Body plate 15a Body plate rib part (convex part)
15b Body plate joint (lower part)
15c Body plate joint (upper part)
15d Body outer plate 16 Lower plate 16a Lower plate rib part (convex part)
22 Hot water supply terminal

Claims (4)

略円筒状の胴板の上方及び下方と、略半球状の上部板及び下部板とをそれぞれ溶接で一体形成し、加熱手段を用いて任意の温度に加熱した温水を貯湯する給湯装置の貯湯タンクにおいて、前記上部板の略端部及び/又は下部板の溶接部近傍に外方へ突出させた略円周状の凸部を設け、前記略円筒状の胴板の上方及び/又は下方の溶接部近傍に外方へ突出させた略円周状の凸部を設けるとともに、前記胴板の少なくとも溶接部近傍の板厚を、前記上部板及び/又は下部板の溶接部近傍の板厚と同等もしくはそれより薄くしたことを特徴する給湯装置の貯湯タンク。 A hot water storage tank of a hot water supply apparatus for storing hot water heated to an arbitrary temperature using a heating means, wherein the upper and lower portions of the substantially cylindrical body plate and the substantially hemispherical upper and lower plates are integrally formed by welding, respectively. A substantially circumferential convex portion projecting outward is provided in the vicinity of the substantially end portion of the upper plate and / or the welded portion of the lower plate, and welding above and / or below the substantially cylindrical body plate. A convex portion having a substantially circumferential shape projecting outward is provided in the vicinity of the portion, and at least the plate thickness in the vicinity of the welded portion of the body plate is equal to the plate thickness in the vicinity of the welded portion of the upper plate and / or the lower plate Or a hot water storage tank of a hot water supply device characterized by being made thinner. 略円筒状の胴板の上方及び下方と、略半球状の上部板及び下部板とをそれぞれ溶接で一体形成し、加熱手段を用いて任意の温度に加熱した温水を貯湯する給湯装置の貯湯タンクにおいて、前記上部板の略端部及び/又は下部板の溶接部近傍に外方へ突出させた略円周状の凸部を設け、前記略円筒状の胴板の上方及び/又は下方の溶接部近傍に前記胴板と同心円状の胴外板を設けるとともに、前記胴板の少なくとも溶接部近傍の板厚を、前記上部板及び/又は下部板の溶接部近傍の板厚と同等もしくはそれより薄くしたことを特徴する給湯装置の貯湯タンク。 A hot water storage tank of a hot water supply apparatus for storing hot water heated to an arbitrary temperature using a heating means, wherein the upper and lower portions of the substantially cylindrical body plate and the substantially hemispherical upper and lower plates are integrally formed by welding, respectively. A substantially circumferential convex portion projecting outward is provided in the vicinity of the substantially end portion of the upper plate and / or the welded portion of the lower plate, and welding above and / or below the substantially cylindrical body plate. A trunk outer plate concentric with the trunk plate is provided in the vicinity of the portion, and the thickness of at least the vicinity of the welded portion of the trunk plate is equal to or greater than the thickness of the upper plate and / or the lower plate near the welded portion. A hot water storage tank of a hot water supply device characterized by being made thinner. 水道水を給水するための給水部と、温水を供給するための出湯部と、前記給水部に設けた給水圧力を減ずるための減圧弁と、前記減圧弁以上の圧力を開放するための圧力逃し安全弁とを備え、前記減圧弁の設定圧力を0.25MPa以上としたことを特徴する請求項1または2に記載の給湯装置の貯湯タンク。 A water supply unit for supplying tap water, a hot water supply unit for supplying hot water, a pressure reducing valve for reducing the water supply pressure provided in the water supply unit, and a pressure relief for releasing the pressure above the pressure reducing valve The hot water storage tank of the hot water supply device according to claim 1 or 2, further comprising a safety valve, wherein a set pressure of the pressure reducing valve is set to 0.25 MPa or more. 請求項1〜3のいずれか1項に記載の給湯装置の貯湯タンクと、圧縮機、水−冷媒熱交換器、減圧手段、空気−冷媒熱交換器を順次接続して形成した加熱手段とから構成したことを特徴とするヒートポンプ給湯機。 The hot water storage tank of the hot water supply device according to any one of claims 1 to 3, and a heating unit formed by sequentially connecting a compressor, a water-refrigerant heat exchanger, a decompression unit, and an air-refrigerant heat exchanger. A heat pump water heater characterized by comprising.
JP2008074905A 2008-03-24 2008-03-24 Hot water storage tank of water heater and heat pump water heater using the same Expired - Fee Related JP4985504B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2012176325A1 (en) * 2011-06-24 2015-02-23 三菱電機株式会社 Water heater
CN105972827A (en) * 2016-06-23 2016-09-28 珠海格力电器股份有限公司 Water tank inner container, water tank and water heater
CN111380207A (en) * 2018-12-27 2020-07-07 青岛海高设计制造有限公司 Heat pump water heater

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Publication number Priority date Publication date Assignee Title
JPH02217752A (en) * 1989-02-15 1990-08-30 Tokyo Danreiki Seisakusho:Kk Water supply device of hot water storage type warm water tank
JPH03148489A (en) * 1989-10-30 1991-06-25 Hitachi Ltd Liquid storage tank
JP2001033106A (en) * 1999-07-22 2001-02-09 Mitsubishi Electric Corp Storage water heater body
JP2006284128A (en) * 2005-04-01 2006-10-19 Denso Corp Hot water storage tank for water heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02217752A (en) * 1989-02-15 1990-08-30 Tokyo Danreiki Seisakusho:Kk Water supply device of hot water storage type warm water tank
JPH03148489A (en) * 1989-10-30 1991-06-25 Hitachi Ltd Liquid storage tank
JP2001033106A (en) * 1999-07-22 2001-02-09 Mitsubishi Electric Corp Storage water heater body
JP2006284128A (en) * 2005-04-01 2006-10-19 Denso Corp Hot water storage tank for water heater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2012176325A1 (en) * 2011-06-24 2015-02-23 三菱電機株式会社 Water heater
CN105972827A (en) * 2016-06-23 2016-09-28 珠海格力电器股份有限公司 Water tank inner container, water tank and water heater
CN111380207A (en) * 2018-12-27 2020-07-07 青岛海高设计制造有限公司 Heat pump water heater

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